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[What Is Docker?](https://www.paloaltonetworks.com/cyberpedia/docker?ts=markdown) Table of Contents * [What Is Container Security?](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security?ts=markdown) * [Container Security Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security#container-security?ts=markdown) * [Understanding the Attack Surface](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security#attack-surface?ts=markdown) * [How to Secure Containers](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security#secure-containers?ts=markdown) * [Container Security Solutions](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security#solutions?ts=markdown) * [Container Security FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security#faq?ts=markdown) * [Managing Permissions with Kubernetes RBAC](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac?ts=markdown) * [Kubernetes RBAC Defined](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#kubernetes?ts=markdown) * [Why Is RBAC Important for Kubernetes Security?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#important?ts=markdown) * [RBAC Roles and Permissions in Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#roles?ts=markdown) * [How Kubernetes RBAC Works](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#how?ts=markdown) * [The Role of RBAC in Kubernetes Authorization](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#authorization?ts=markdown) * [Common RBAC Permissions Risks and Vulnerabilities](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#common?ts=markdown) * [Kubernetes RBAC Best Practices and Recommendations](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#best?ts=markdown) * [Kubernetes and RBAC FAQ](https://www.paloaltonetworks.com/cyberpedia/kubernetes-rbac#faqs?ts=markdown) * [Kubernetes: How to Implement AI-Powered Security](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security?ts=markdown) * [Common Threats to Kubernetes Clusters](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security#common?ts=markdown) * [How Is AI Used to Enhance Kubernetes Security?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security#how?ts=markdown) * [How Do You Implement AI-Powered Security in Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security#do?ts=markdown) * [What Are the Best Types of AI-Powered Tools for Kubernetes Security?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security#what?ts=markdown) * [Kubernetes and AI-Powered Security FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-ai-security#faqs?ts=markdown) * [What Is Container Runtime Security?](https://www.paloaltonetworks.com/cyberpedia/runtime-security?ts=markdown) * [Container Runtime Security for Modern Applications](https://www.paloaltonetworks.com/cyberpedia/runtime-security#runtime-security?ts=markdown) * [Models and Rules: Understanding Container Runtime Security](https://www.paloaltonetworks.com/cyberpedia/runtime-security#models?ts=markdown) * [Components of Container Runtime Security](https://www.paloaltonetworks.com/cyberpedia/runtime-security#components?ts=markdown) * [Best Practices for Optimal Runtime Security](https://www.paloaltonetworks.com/cyberpedia/runtime-security#best-practices?ts=markdown) * [At-a Glance Runtime Security Checklist](https://www.paloaltonetworks.com/cyberpedia/runtime-security#checklist?ts=markdown) * [Runtime Security FAQs](https://www.paloaltonetworks.com/cyberpedia/runtime-security#faq?ts=markdown) * [What Is Kubernetes Security?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security?ts=markdown) * [Kubernetes Security Explained](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#kubernetes?ts=markdown) * [The Importance of Kubernetes Security](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#importance?ts=markdown) * [Application Security in Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#application?ts=markdown) * [7 Common Kubernetes Security Mistakes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#mistakes?ts=markdown) * [Kubernetes Security Best Practices](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#practices?ts=markdown) * [Kubernetes Security FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security#faqs?ts=markdown) * [Multicloud Management with Al and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management?ts=markdown) * [Multicloud Kubernetes Defined](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#multicloud?ts=markdown) * [How Does Kubernetes Facilitate Multicloud Management?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#how?ts=markdown) * [Multicloud Management Using AI and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#kubernetes?ts=markdown) * [Key AI and Kubernetes Capabilities](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#key?ts=markdown) * [Strategic Planning for Multicloud Management](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#strategic?ts=markdown) * [Steps to Manage Multiple Cloud Environments with AI and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#steps?ts=markdown) * [Multicloud Management Challenges](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#challenges?ts=markdown) * [Kubernetes Multicloud Management with AI FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-multicloud-management#faqs?ts=markdown) * [What Is Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes?ts=markdown) * [Kubernetes Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#kubernetes?ts=markdown) * [Kubernetes Architecture](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#architecture?ts=markdown) * [Nodes: The Foundation](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#nodes?ts=markdown) * [Clusters](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#clusters?ts=markdown) * [Pods: The Basic Units of Deployment](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#pods?ts=markdown) * [Kubelet](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#kubelet?ts=markdown) * [Services: Networking in Kubernetes](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#services?ts=markdown) * [Volumes: Handling Persistent Storage](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#volumes?ts=markdown) * [Deployments in Kubernetes](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#deployments?ts=markdown) * [Kubernetes Automation and Capabilities](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#capabilities?ts=markdown) * [Benefits of Kubernetes](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#benefits?ts=markdown) * [Kubernetes Vs. Docker](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#compare?ts=markdown) * [Kubernetes FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-kubernetes#faq?ts=markdown) * [What Is Kubernetes Security Posture Management (KSPM)?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm?ts=markdown) * [Kubernetes Security Posture Management Explained](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#kspm?ts=markdown) * [What Is the Importance of KSPM?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#importance?ts=markdown) * [KSPM \& the Four Cs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#kspm-cs?ts=markdown) * [Vulnerabilities Addressed with Kubernetes Security Posture Management](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#vulnerabilities?ts=markdown) * [How Does Kubernetes Security Posture Management Work?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#how?ts=markdown) * [What Are the Key Components and Functions of an Effective KSPM Solution?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#components?ts=markdown) * [KSPM Vs. CSPM](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#vs?ts=markdown) * [Best Practices for KSPM](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#best-practices?ts=markdown) * [KSPM Use Cases](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#use-cases?ts=markdown) * [Kubernetes Security Posture Management (KSPM) FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-security-posture-management-kspm#faq?ts=markdown) * [What Is Orchestration Security?](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security?ts=markdown) * [Orchestration Security Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security#orchestration-security?ts=markdown) * [Securing the Build Layer](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security#build-layer?ts=markdown) * [Orchestration Access Security](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security#access-security?ts=markdown) * [At-a-Glance Container Orchestration Security Checklist](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security#checklist?ts=markdown) * [Container Orchestration FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-orchestration-security#faq?ts=markdown) * [What Is Container Orchestration?](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration?ts=markdown) * [Container Orchestration Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#container-orchestration?ts=markdown) * [Orchestration Tools](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#tools?ts=markdown) * [Key Components of Orchestrators](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#components?ts=markdown) * [Container Orchestration and the Pipeline](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#pipeline?ts=markdown) * [Benefits of Container Orchestration](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#benefits?ts=markdown) * [The Container Ecosystem](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#ecosystem?ts=markdown) * [Container Orchestration FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-container-orchestration#faq?ts=markdown) * [How to Secure Kubernetes Secrets and Sensitive Data](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets?ts=markdown) * [Kubernetes Secrets Explained](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#kubernetes?ts=markdown) * [Importance of Securing Kubernetes Secrets](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#importance?ts=markdown) * [How Kubernetes Secrets Work](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#kubernetes-secrets?ts=markdown) * [How Do You Store Sensitive Data in Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#sensitive-data?ts=markdown) * [How Do You Secure Secrets in Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#secure-secrets?ts=markdown) * [Challenges in Securing Kubernetes Secrets](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#challenges?ts=markdown) * [What Are the Best Practices to Make Kubernetes Secrets More Secure?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#best-practices?ts=markdown) * [What Tools Are Available to Secure Secrets in Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#tools?ts=markdown) * [Kubernetes Secrets FAQ](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets#faq?ts=markdown) * [Kubernetes and Infrastructure as Code](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code?ts=markdown) * [Infrastructure as Code in the Kubernetes Environment](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#kubernetes-environment?ts=markdown) * [Understanding IaC](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#iac?ts=markdown) * [IaC Security Is Key](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#iac-security?ts=markdown) * [Kubernetes Host Infrastructure Security](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#host-infrastructure-security?ts=markdown) * [IAM Security for Kubernetes Clusters](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#iam-security?ts=markdown) * [Container Registry and IaC Security](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#container-registry?ts=markdown) * [Avoid Pulling "Latest" Container Images](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#container-images?ts=markdown) * [Avoid Privileged Containers and Escalation](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#privileged-containers?ts=markdown) * [Isolate Pods at the Network Level](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#isolate-pods?ts=markdown) * [Encrypt Internal Traffic](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#encrypt?ts=markdown) * [Specifying Resource Limits](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#resource-limits?ts=markdown) * [Avoiding the Default Namespace](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#namespace?ts=markdown) * [Enable Audit Logging](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#audit-logging?ts=markdown) * [Securing Open-Source Kubernetes Components](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#kubernetes-components?ts=markdown) * [Kubernetes Security Across the DevOps Lifecycle](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#devops-lifecycle?ts=markdown) * [Kubernetes and Infrastructure as Code FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-infrastructure-as-code#faq?ts=markdown) * [What Is the Difference Between Dockers and Kubernetes?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker?ts=markdown) * [Docker Defined](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#defined?ts=markdown) * [Kubernetes Explained](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#explained?ts=markdown) * [Docker and Kubernetes: Comparison of Containerization Platforms](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#platforms?ts=markdown) * [Kubernetes Vs. Docker: Complementary, Not Competitors](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#competitors?ts=markdown) * [Benefits of Integrating Docker and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#benefits?ts=markdown) * [Use Cases and Applications for Docker and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#usecases?ts=markdown) * [Dockers and Kubernetes FAQ](https://www.paloaltonetworks.com/cyberpedia/kubernetes-docker#faqs?ts=markdown) * [Securing Your Kubernetes Cluster: Kubernetes Best Practices and Strategies](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security?ts=markdown) * [What Is the Importance of a Secure Kubernetes Cluster?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security#importance?ts=markdown) * [Understanding Kubernetes Security](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security#security?ts=markdown) * [What Are Kubernetes Security Considerations and Security Best Practices?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security#practices?ts=markdown) * [What Are Advanced Strategies for Kubernetes Security?](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security#advanced?ts=markdown) * [Kubernetes Cluster Security FAQs](https://www.paloaltonetworks.com/cyberpedia/kubernetes-cluster-security#faqs?ts=markdown) * [What Is a Host Operating System (OS)?](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers?ts=markdown) * [The Host Operating System (OS) Explained](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#os?ts=markdown) * [Host OS Selection](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#selection?ts=markdown) * [Host OS Security](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#security?ts=markdown) * [Implement Industry-Standard Security Benchmarks](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#benchmarks?ts=markdown) * [Container Escape](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#container-escape?ts=markdown) * [System-Level Security Features](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#security-features?ts=markdown) * [Patch Management and Vulnerability Management](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#patch-management?ts=markdown) * [File System and Storage Security](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#storage-security?ts=markdown) * [Host-Level Firewall Configuration and Security](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#firewall-configuration?ts=markdown) * [Logging, Monitoring, and Auditing](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#logging?ts=markdown) * [Host OS Security FAQs](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers#faq?ts=markdown) * What Is Docker? * [Docker Explained](https://www.paloaltonetworks.com/cyberpedia/docker#docker?ts=markdown) * [Understanding Docker Containers](https://www.paloaltonetworks.com/cyberpedia/docker#understanding?ts=markdown) * [Core Components of Docker](https://www.paloaltonetworks.com/cyberpedia/docker#core?ts=markdown) * [What Platforms and Environments Does Docker Support?](https://www.paloaltonetworks.com/cyberpedia/docker#what?ts=markdown) * [How Does Docker Work?](https://www.paloaltonetworks.com/cyberpedia/docker#how?ts=markdown) * [Docker Tools](https://www.paloaltonetworks.com/cyberpedia/docker#tools?ts=markdown) * [Docker Use Cases and Benefits](https://www.paloaltonetworks.com/cyberpedia/docker#benefits?ts=markdown) * [Docker FAQ](https://www.paloaltonetworks.com/cyberpedia/docker#faqs?ts=markdown) * [What Is Container Registry Security?](https://www.paloaltonetworks.com/cyberpedia/container-registry-security?ts=markdown) * [Container Registry Security Explained](https://www.paloaltonetworks.com/cyberpedia/container-registry-security#container-registry?ts=markdown) * [Components of Container Registry Security](https://www.paloaltonetworks.com/cyberpedia/container-registry-security#components?ts=markdown) * [Promoting Image and Artifact Integrity in CI/CD](https://www.paloaltonetworks.com/cyberpedia/container-registry-security#artifact-integrity?ts=markdown) * [At-a-Glance Container Registry Security Checklist](https://www.paloaltonetworks.com/cyberpedia/container-registry-security#checklist?ts=markdown) * [Container Registry FAQs](https://www.paloaltonetworks.com/cyberpedia/container-registry-security#faq?ts=markdown) * [What Is a Container?](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container?ts=markdown) * [Containers Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#containers?ts=markdown) * [Understanding Container Components](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#components?ts=markdown) * [Container Infrastructure](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#infrastructure?ts=markdown) * [Know Your Container Types](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#types?ts=markdown) * [Harnessing the Efficiency of Containerization](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#efficiency?ts=markdown) * [Container FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container#faq?ts=markdown) * [What Is Containerization?](https://www.paloaltonetworks.com/cyberpedia/containerization?ts=markdown) * [Why Is Containerization Important?](https://www.paloaltonetworks.com/cyberpedia/containerization#why?ts=markdown) * [Containers: A Modern Contender to VMs](https://www.paloaltonetworks.com/cyberpedia/containerization#containers?ts=markdown) * [To Container or Not to Container: Moving Applications to the Cloud](https://www.paloaltonetworks.com/cyberpedia/containerization#apps?ts=markdown) * [Architecture and Migration](https://www.paloaltonetworks.com/cyberpedia/containerization#architecture?ts=markdown) * [Choosing a Cloud Migration Method](https://www.paloaltonetworks.com/cyberpedia/containerization#migration?ts=markdown) * [When Micro Means Fast](https://www.paloaltonetworks.com/cyberpedia/containerization#micro?ts=markdown) * [Container FAQs](https://www.paloaltonetworks.com/cyberpedia/containerization#faq?ts=markdown) # What Is Docker? 5 min. read Table of Contents * * [Docker Explained](https://www.paloaltonetworks.com/cyberpedia/docker#docker?ts=markdown) * [Understanding Docker Containers](https://www.paloaltonetworks.com/cyberpedia/docker#understanding?ts=markdown) * [Core Components of Docker](https://www.paloaltonetworks.com/cyberpedia/docker#core?ts=markdown) * [What Platforms and Environments Does Docker Support?](https://www.paloaltonetworks.com/cyberpedia/docker#what?ts=markdown) * [How Does Docker Work?](https://www.paloaltonetworks.com/cyberpedia/docker#how?ts=markdown) * [Docker Tools](https://www.paloaltonetworks.com/cyberpedia/docker#tools?ts=markdown) * [Docker Use Cases and Benefits](https://www.paloaltonetworks.com/cyberpedia/docker#benefits?ts=markdown) * [Docker FAQ](https://www.paloaltonetworks.com/cyberpedia/docker#faqs?ts=markdown) 1. Docker Explained * * [Docker Explained](https://www.paloaltonetworks.com/cyberpedia/docker#docker?ts=markdown) * [Understanding Docker Containers](https://www.paloaltonetworks.com/cyberpedia/docker#understanding?ts=markdown) * [Core Components of Docker](https://www.paloaltonetworks.com/cyberpedia/docker#core?ts=markdown) * [What Platforms and Environments Does Docker Support?](https://www.paloaltonetworks.com/cyberpedia/docker#what?ts=markdown) * [How Does Docker Work?](https://www.paloaltonetworks.com/cyberpedia/docker#how?ts=markdown) * [Docker Tools](https://www.paloaltonetworks.com/cyberpedia/docker#tools?ts=markdown) * [Docker Use Cases and Benefits](https://www.paloaltonetworks.com/cyberpedia/docker#benefits?ts=markdown) * [Docker FAQ](https://www.paloaltonetworks.com/cyberpedia/docker#faqs?ts=markdown) Docker is a tool that speeds up the process of creating, testing, and deploying applications by using [containers](https://www.paloaltonetworks.com/cyberpedia/what-is-a-container?ts=markdown). It packages an application into a container, which contains all the necessary elements for the application to operate. This container can then be run on any system, making it highly versatile. Docker is offered as free, open-source software and as a paid, commercial product. ## Docker Explained Docker provides a speedy and flexible environment for developing applications. Developers can wrap their applications in containers, which are like standard packages equipped with everything the application needs to run, such as the code, runtime environment, libraries, and system tools. These containers can work anywhere, from a developer's computer to cloud-based servers in a datacenter, making it easy to deploy applications consistently across different platforms. ## Understanding Docker Containers Docker is built around containers, which offer a streamlined and efficient alternative to older approaches that rely on virtual machines (VMs), each needing its own operating system for every application. These Docker containers are separated from both the host system and each other. They use the host's core operating system functions while running in their own isolated spaces. By using Docker for containerization, the processes of developing, testing, and deploying applications become more efficient. This approach also boosts performance, enhances the ability to scale, and ensures applications can be easily moved and securely run anywhere. Additionally, it makes better use of system resources and simplifies the workflow for developers. ## Core Components of Docker The Docker architecture comprises various components that help developers create, verify, and manage containers. ### Docker Engine The Docker Engine facilitates application containerization. It's designed for creating containers, operating them, and managing their orchestration. It consists of three primary parts. #### 1. Docker Daemon A server-side component, dockerd creates, runs, and manages Docker containers. The Docker daemon responds to Docker API requests and handles Docker objects (e.g., Docker images, containers, networks, and volumes). #### 2. Docker Engine API The Docker Engine API is a RESTful API served by the Docker Engine that the Docker client uses to communicate with the Docker Engine. The API specifies interfaces that applications can use to send instructions to the Docker daemon. #### 3. Docker Client The Docker client is the command-line interface (CLI) that is used to send commands to dockerd via the Docker API. ### Docker Swarm Docker Swarm supports cluster load balancing for Docker. It transforms a pool of Docker hosts into a single virtual host, which is key for high availability and scalability. Swarm leverages a distributed consensus algorithm to manage cluster state and orchestrate container deployment across nodes using declarative configurations, while its compatibility with standard Docker API endpoints ensures seamless integration with existing Docker tools and applications. ### Dockerfiles The Dockerfile details the steps to construct Docker images. It specifies the base image, commands, and file copy operations required to assemble the application environment. Dockerfiles ensure reproducibility and version control in the development lifecycle. ### Docker Container A Docker container is a lightweight runnable instance of Docker images. It encapsulates the application, its environment, and the dependencies to run the application isolated from the underlying system, such as code, runtime, system tools, libraries, and settings. Docker containers can be started, stopped, moved, and deleted. ### Docker Images Docker images specify the commands and steps needed to build Docker containers. They include the application or service, dependencies, libraries, and other binaries required to run the application. Docker images are stored in a registry. ### Docker Registries A [Docker registry](https://www.paloaltonetworks.com/cyberpedia/container-registry-security?ts=markdown) is a repository that centrally stores and distributes Docker images. The default public registry is the Docker Hub, but users can create private registries. ### Docker Volumes Docker volumes ensure that data generated by and used by Docker containers persists across container restarts and rebuilds. Docker manages Docker Volumes and they remain independent rather than persisting data in a container's writable layer. ### Docker Networks Docker comes with network drivers that help containers talk to each other and connect to the internet or different networks. These Docker networks create safe, separate paths for communication between containers, ensuring the security of applications running inside them. ### Docker Compose Docker Compose allows developers to deploy services, networks, and volumes for multi-container Docker applications. With a YAML file to configure the application's services, networks, and volumes, Docker Compose allows for a simplified deployment process by executing a single command to spin up the full stack. ## What Platforms and Environments Does Docker Support? Docker is platform-agnostic. It supports a number of operating systems and environments for developing, shipping, and running [containerized applications](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native?ts=markdown). ### Docker Supported Operating Systems * Linux: Ubuntu, CentOS, and Red Hat Enterprise Linux * Windows: Windows 10 and Windows Server 2016 and newer versions * macOS Docker mainly relies on [containerization](https://www.paloaltonetworks.com/cyberpedia/containerization?ts=markdown) to separate and operate applications using the built-in features of the Linux kernel. For systems not based on Linux or when extra separation is needed, Docker uses a hypervisor. ### Cloud and Virtualization Platforms * Amazon Web Services (AWS): Amazon Elastic Container Service (ECS) and Amazon Elastic Kubernetes Service (EKS) * Microsoft: Azure Container Instances (ACI) and Azure Kubernetes Service (AKS) * Google Cloud Platform (GCP): Google Kubernetes Engine (GKE) and Cloud Run * VMware: VMware virtual machines (VMs) and VMware's Tanzu portfolio * Oracle Cloud: Oracle Cloud Infrastructure (OCI), Oracle Container Engine for Kubernetes (OKE), and Oracle Cloud Infrastructure Registry ### Development Environments * Integrated Development Environments (IDEs): Visual Studio Code, IntelliJ IDEA, and Eclipse * CI/CD Tools: GitLab CI and GitHub Actions ## How Does Docker Work? The following is a step-by-step overview of how a developer would work with Docker. * Install Docker Engine on a host machine. * Create a Dockerfile to define how an application's container should be built. * Build a Docker image from the Dockerfile. * Store and share Docker images in a registry. * Start an application using the Docker CLI to launch a container from an image. * Manage Docker containers' lifecycles, including starting, stopping, restarting, and removing containers. * Configure Docker networks to isolate containers, link them together, or expose them to the host network. * Use Docker volumes and bind mounts to persist data outside of the container's writable layer. * Use Docker Compose to define and run complex applications that require multiple containers. * Monitor logs of container performance, resource usage, and health. It's essential to implement appropriate security measures when using Docker, including: * Apply resource limits to prevent denial-of-service attacks. * Avoid running containers as root. * Enable logging and monitoring for unusual activities. * Implement network segmentation and firewall rules to control traffic. * Keep Docker hosts updated. * Limit container privileges with cgroups. * Minimize installed packages. * Provide process and network isolation using namespaces. * Run the Docker daemon with restricted privileges and protect its socket. * Update the Docker Engine and container dependencies. * Use official or trusted Docker images and scan them for vulnerabilities. *Related Article: [Container Security](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security?ts=markdown)* ## Docker Tools ### Docker Desktop Docker Desktop serves as the primary platform for developers to build, test, and deploy Docker containers on Mac and Windows. It integrates Docker Engine, providing a local environment consistent with production servers. The tool includes Kubernetes for [orchestration](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security?ts=markdown), enabling developers to simulate clustered deployments. ### Docker Hub Docker Hub is a cloud-based repository service where users can store, share, and manage Docker container images. It provides automated build capabilities, version control, and integration with GitHub and Bitbucket, supporting both public and private repositories and facilitating collaboration and pipeline automation. ### Docker Trusted Registry Docker Trusted Registry is Docker's enterprise-grade image storage solution that allows corporations to securely store and manage the images used in their Docker environments. It offers image signing for security, fine-grained access control, and the ability to run behind an organization's firewall, integrating with existing user authentication systems. ### Docker Machine Docker Machine automates the provisioning of Docker hosts on local machines, cloud providers, or inside your datacenter. It simplifies the process of managing Dockerized environments on a variety of platforms, including virtual machines, physical servers, and cloud instances, by providing a unified command-line interface. ### Docker Engine: Community Edition (CE) Docker Engine CE is the free, open-source version of Docker Engine, designed for developers and DIY enthusiasts interested in experimenting with containerized applications. Docker Engine CE is lightweight and offers developers the essentials to build, ship, and run distributed applications on a wide range of platforms. It includes the full Docker platform, supporting all the tools and functionalities necessary to build, share, and run Docker containers. ### Docker Engine: Enterprise Edition (EE) Docker Engine EE is designed for enterprise development and IT teams who build, ship, and run business-critical applications in production at scale. Docker Engine EE includes enterprise-grade features such as image signing and verification, long-term support, and certified plugins, providing a more secure, scalable, and supported platform. ### Docker Security Scanning Docker Security Scanning is an integrated feature within Docker Hub and Docker Trusted Registry that provides a detailed security assessment of Docker images by scanning for known vulnerabilities. It compiles comprehensive reports and notifies developers, enabling them to identify and address security issues before deployment. ### Docker Bench for Security Docker Bench for Security is a script that checks for dozens of common best practices around deploying Docker containers in production. The tool audits a Docker host against the [security standards](https://www.paloaltonetworks.com/cyberpedia/what-is-container-security?ts=markdown) defined in the Center for Internet Security (CIS) Docker Community Edition Benchmark, offering insights and recommendations for securing Docker environments. ### Docker Datacenter Docker Datacenter, now a component of Docker Enterprise, offers an integrated platform for container management and deployment. It provides a container as a service (CaaS) solution for IT and development teams to provision, operate, and secure Docker environments with role-based access control, image signing, and policy-driven automation. ### Docker Notary Docker Notary ensures the integrity of Docker images by providing a framework to publish and verify content. Leveraging The Update Framework (TUF), Notary offers cryptographic signatures to [secure the software supply chain](https://www.paloaltonetworks.com/cyberpedia/what-is-secure-software-development-lifecycle?ts=markdown), allowing users to sign and then verify the authenticity and integrity of container images. ## Docker Use Cases and Benefits ### CI/CD Pipeline Docker's container-based approach greatly enhances [CI/CD pipelines](https://www.paloaltonetworks.com/cyberpedia/what-is-the-ci-cd-pipeline-and-ci-cd-security?ts=markdown), making it quicker to deploy applications. Automated testing tools within Docker help maintain high code quality by spotting problems early in the development process. ### Compliance With Docker, compliance requirements compliance and security policies can be defined as code using Dockerfiles and configuration management tools. This helps enforce compliance with policies consistently across all containerized applications, reducing manual oversight and human error. ### Legacy Application Migration Legacy applications can be migrated to Docker, ensuring that legacy applications run consistently across development, testing, and production environments. This reduces compatibility issues and streamlines deployment processes. ### Microservices By supporting [microservices](https://www.paloaltonetworks.com/cyberpedia/what-are-microservices?ts=markdown), Docker enables the independent deployment and delivery of services. This allows services to scale quickly based on demand, reduces the impact of failures by isolating them within specific services, and facilitates rapid iteration and updates to speed development processes. ### Vulnerability Management Docker-integrated tools can be used to scan container images for known vulnerabilities during development and before deployment to identify and remediate vulnerabilities early. This enhances [vulnerability management](https://www.paloaltonetworks.com/cyberpedia/what-Is-vulnerability-management?ts=markdown), reducing the risk of exploitation in production environments. ## Docker FAQ ### How does Docker differ from virtualization? Docker runs applications in separate, [isolated spaces on a host's main operating system (OS)](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers) using containerization. Virtualization involves creating complete VMs, each with its own operating system. This makes Docker containers more efficient than virtual machines because they are lighter, boot up quicker, consume less of the host's resources, and can be scaled more easily. ### What are docker containers? Docker containers are lightweight, standalone, executable packages that include everything needed to run a piece of software, including the code, runtime, system tools, libraries, and settings. Containers isolate software from its environment and ensure that it works uniformly despite differences for instance between development and staging. ### What are docker images? Docker images are immutable files that serve as the source code for containers. They contain a snapshot of a Docker container's filesystem, along with metadata about how to run a container based on the image. Images are layered, allowing for the reuse of files, minimizing disk usage and speeding up the build process. ### What is Docker build? Docker build is a command-line function that creates a Docker image from a Dockerfile and context. The build process compiles source code, includes dependencies, and configures the environment within the image. Developers use this command to package their applications into images ready for deployment. ### What is Docker push? Docker push uploads an image from the local system to a remote repository. Typically used with Docker Hub or self-hosted registries, this command enables sharing and distribution of container images across different environments or with other collaborators, effectively versioning and storing application images for deployment. ### What is Docker pull? Docker pull fetches an image from a registry and saves it to the local system. This command allows users to download pre-built images to run containers locally or on a host in the cluster, ensuring that they can access and deploy the latest versions of the necessary images. ### What is Docker run? Docker run is a command that starts a container from a specified image. It initializes a writable layer on top of the image layers, sets up the network and storage, and begins execution of the application within the container environment as defined by the image's metadata. ### What is a Dockerfile? A Dockerfile is a text document containing all the commands a user could call on the command line to assemble an image. Using docker build, developers can create an automated build that executes several command-line instructions in succession. ### What is Docker daemon? The Docker daemon is a persistent background service that manages Docker images, containers, networks, and storage volumes on a host machine. It processes requests from the Docker API, used by the Docker CLI or other Docker clients, to control Docker objects and services. ### What are Docker volumes? Docker volumes are persistent data stores for containers. Unlike the ephemeral filesystem of a container, volumes are managed by the Docker host and survive container rebuilds and restarts, enabling data to remain intact across container updates and allowing for data sharing between containers. ### What is Docker networking? Docker networking enables standalone containers to communicate with each other and with other systems. It leverages network namespaces and virtual bridges to provide isolation and network connectivity, supporting multiple networking models including bridge, host, overlay, macvlan, and none, which dictate how containers connect with networks and each other. ### What is a Docker registry? A Docker registry is a stateless, highly scalable server-side application that stores and distributes Docker images. Registries come in two forms: public, like Docker Hub, which provides a centralized resource for container image discovery and distribution, and private, which secures proprietary images for internal use within an organization. ### What is the Docker CLI? The Docker Command Line Interface (CLI) is a tool that allows users to interact with the Docker Daemon through commands. Users can execute various operations such as building, pulling, and running containers, managing images, containers, networks, and volumes using the CLI. ### What is a Docker node? A Docker node refers to a physical or virtual machine that runs an instance of the Docker Engine and participates in the cluster. In the context of Docker Swarm, nodes can be either managers, responsible for orchestrating and scheduling containers, or workers, executing tasks and running containers. ### What are Docker services? Docker services are the scalable units in a Docker Swarm environment. They define the desired state of containerized applications, specifying the image to use, the commands to run, and the replicas required. Services enable high-level abstractions for deploying and managing containers across a distributed cluster. ### What is a Docker stack? A Docker stack is a group of interrelated services that share dependencies and are orchestrated and managed together. Defined in a Docker Compose file, stacks are deployed to manage more complex applications with multiple containers that work together, maintaining service definitions and network configurations in a single document. ### What are Docker secrets? Like [Kubernetes secrets](https://www.paloaltonetworks.com/cyberpedia/kubernetes-secrets), Docker secrets are a secure way to store and manage sensitive data such as passwords and encryption keys in Docker Swarm. They prevent the direct exposure of [sensitive data](https://www.paloaltonetworks.com/cyberpedia/sensitive-data) in stack definitions or source code, and are only accessible to services running on the Swarm that have been granted explicit access to them. ### What is the Docker API? The Docker API provides a programmatic interface for controlling the Docker Daemon and manipulating Docker objects. It allows developers to build tools and applications that interact with Docker services, facilitating container management, image creation, and orchestration tasks through standardized HTTP requests. ### What is Docker security? Docker security encompasses the methods and tools used to protect Docker containers and the host system. It involves securing the Docker Daemon, managing container access controls, ensuring image integrity, and isolating container runtime environments using namespaces and cgroups to prevent unauthorized access and mitigate risks. ### What is immutable infrastructure? Immutable infrastructure is a paradigm where servers are never modified after deployment; any changes require redeploying a new instance. This model enhances consistency and reliability in environments, as changes are made through controlled processes, reducing the risk of configuration drift and ensuring that the infrastructure state remains consistent with the versioned configuration. ### What is a Docker namespace? Docker namespaces provide isolation for containers, creating a layer of security by ensuring that each container has its own view of the operating system, including processes, network interfaces, and file systems. Namespaces restrict containers from seeing or affecting resources in other namespaces, an essential feature for multi-tenant environments. Related content [The Definitive Guide to Container Security Get the ultimate guide to securing your containers, your essential resource for understanding, implementing and mastering security in a containerized environment.](https://www.paloaltonetworks.com/resources/ebooks/container-security-definitive-guide?ts=markdown) [QlikTech Secures Container Development with AWS and Prisma Cloud Explore how Qlik, a business intelligence company, leverages AWS and Prisma Cloud to secure container-based workloads and protect customer data in their Kubernetes deployments.](https://www.paloaltonetworks.com/resources/videos-customers/qliktech-secures-container-development-with-aws-and-prisma-cloud?ts=markdown) [Kubernetes Privilege Escalation: Excessive Permissions in Popular Platforms To understand the impact of excessive permissions, we analyzed popular Kubernetes platforms --- distributions, managed services, and common add-ons --- to identify infrastructure compo...](https://www.paloaltonetworks.com/resources/whitepapers/kubernetes-privilege-escalation-excessive-permissions-in-popular-platforms?ts=markdown) [Guide to Operationalizing Your IaC Security Program Infrastructure as code (IaC) plays a key role in containerized applications. Get a step-by-step plan to help you choose your IaC security path based on your needs, operationalize a...](https://www.paloaltonetworks.com/resources/whitepapers/guide-to-operationalizing-your-iac-security-program?ts=markdown) ![Share page on facebook](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/facebook-circular-icon.svg) ![Share page on linkedin](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/linkedin-circular-icon.svg) [![Share page by an email](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/email-circular-icon.svg)](mailto:?subject=What%20Is%20Docker%3F&body=Docker%20simplifies%20app%20deployment%20with%20containerization%2C%20enabling%20developers%20to%20build%2C%20ship%2C%20and%20run%20distributed%20applications%20and%20ensuring%20consistency%20and%20scalability%20across%20systems.%20at%20https%3A//www.paloaltonetworks.com/cyberpedia/docker) Back to Top [Previous](https://www.paloaltonetworks.com/cyberpedia/host-os-operating-system-containers?ts=markdown) What Is a Host Operating System (OS)? 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