A brief analysis of the main directories occupied by Docker and their functions

Docker is a popular containerization tool that makes it easy to create, manage, and run containers. When using Docker, sometimes you need to know which directories Docker occupies. This article will introduce the main directories occupied by Docker and their functions.

1. /var/lib/docker

/var/lib/docker is Docker’s default data storage location, including Docker images, containers, and volumes. Subdirectories under this directory include:

• /containers: stores container-related data and metadata, including container configuration files and log files;
• /image: stores Docker images The file system and metadata;
• /volumes: stores the data and metadata of the Docker volume.

These directories are very important for running Docker containers and will result in data loss if deleted or emptied.

2. /var/run/docker.sock

/var/run/docker.sock is the Unix socket file for the Docker daemon, used to communicate with the Docker API communicate. This file can be accessed by the Docker client and other containers to facilitate the management of data such as containers, images, and volumes.

3. /etc/docker

/etc/docker directory contains Docker’s default configuration file, such as daemon.json, which contains configuration options for the Docker daemon process, such as images Accelerators, container log levels, and more. Modifying these files requires restarting the Docker daemon to take effect.

4. /var/log

/var/log is the log directory of the Linux system, including Docker logs and daemon process logs. Docker logs the output of containers and daemons, which can be used for purposes such as troubleshooting and run log analysis.

5. /run/docker

/run/docker Contains Docker’s runtime files, such as the container’s process information and status. When starting a Docker container, the container's process information will be stored in the /run/docker/containers/ directory. Runtime files may contain sensitive information and should be appropriately secured.

Summary

This article introduces several important directories occupied by Docker, including /var/lib/docker for storing data and the communication socket file of the daemon process /var/run/docker. sock, configuration file directory/etc/docker, log directory/var/log, runtime file directory/run/docker. Understanding these directories helps you better understand and manage Docker containers and images, while also better protecting the data and security of your containers and host systems.

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