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Useful Docker Commands

#docker #container

Docker is a platform for developing, shipping and running applications. In this post, we'll discuss about some of the salient Docker commands used in our projects frequently.

docker pull
This command helps to pull the image from docker hub. If we do not specify the tag to be pulled, latest docker image will be pulled.

docker pull image:tag

docker pull mysql:8.0.33 8.0.33: Pulling from library/mysql e2c03c89dcad: Pull complete 68eb43837bf8: Pull complete 796892ddf5ac: Pull complete 6bca45eb31e1: Pull complete ebb53bc0dcca: Pull complete 2e2c6bdc7a40: Pull complete 6f27b5c76970: Pull complete 438533a24810: Pull complete e5bdf19985e0: Pull complete 667fa148337b: Pull complete 5baa702110e4: Pull complete Digest: sha256:232936eb036d444045da2b87a90d48241c60b68b376caf509051cb6cffea6fdc Status: Downloaded newer image for mysql:8.0.33 docker.io/library/mysql:8.0.33
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docker images
Shows the docker images downloaded to the local machine.

docker images REPOSITORY TAG IMAGE ID CREATED SIZE mysql 8.0.33 041315a16183 11 days ago 565MB
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docker run
Runs the container from the docker image.

docker run -p6000:3306 --name some-mysql-new -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:8.0.33 0dacb1101ad336475f7ebcbc5e21cc9fb894f2bfa4c0a805f65d3ef1f39bf7e4
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-p(host port):(container port) - Host port gets bounded to the container port so that it can be accessible.
-d : Runs the container in the detached mode.

docker ps
Shows the list of running containers.

docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 0dacb1101ad3 mysql:8.0.33 "docker-entrypoint.s…" About a minute ago Up About a minute 33060/tcp, 0.0.0.0:6000->3306/tcp some-mysql-new
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docker stop
Stops a running docker container. The container id needs to be passed.

docker stop 0dacb1101ad3
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docker start
Starts a docker container. The container id needs to be passed.

docker start 0dacb1101ad3
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docker logs

Shows the logs of a Docker container. The container id needs to be passed.

docker logs 0dacb1101ad3 2023-07-16 14:02:16+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.33-1.el8 started. 2023-07-16 14:02:16+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' 2023-07-16 14:02:16+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.33-1.el8 started. 2023-07-16 14:02:16+00:00 [Note] [Entrypoint]: Initializing database files 2023-07-16T14:02:16.555166Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead. 2023-07-16T14:02:16.555434Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.33) initializing of server in progress as process 81 2023-07-16T14:02:16.562164Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-07-16T14:02:17.077951Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-07-16T14:02:18.844888Z 6 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option. 2023-07-16 14:02:23+00:00 [Note] [Entrypoint]: Database files initialized 2023-07-16 14:02:23+00:00 [Note] [Entrypoint]: Starting temporary server 2023-07-16T14:02:23.967805Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead. 2023-07-16T14:02:23.969395Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.33) starting as process 123 2023-07-16T14:02:23.984575Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-07-16T14:02:24.258224Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-07-16T14:02:24.669973Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-07-16T14:02:24.670204Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-07-16T14:02:24.673431Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. 2023-07-16T14:02:24.732237Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: /var/run/mysqld/mysqlx.sock 2023-07-16T14:02:24.733339Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.33' socket: '/var/run/mysqld/mysqld.sock' port: 0 MySQL Community Server - GPL. 2023-07-16 14:02:24+00:00 [Note] [Entrypoint]: Temporary server started. '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock' Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/leap-seconds.list' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/leapseconds' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/tzdata.zi' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it. 2023-07-16 14:02:29+00:00 [Note] [Entrypoint]: Stopping temporary server 2023-07-16T14:02:29.418853Z 10 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.33). 2023-07-16T14:02:31.320144Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.33) MySQL Community Server - GPL. 2023-07-16 14:02:31+00:00 [Note] [Entrypoint]: Temporary server stopped 2023-07-16 14:02:31+00:00 [Note] [Entrypoint]: MySQL init process done. Ready for start up. 2023-07-16T14:02:31.685058Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead. 2023-07-16T14:02:31.686585Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.33) starting as process 1 2023-07-16T14:02:31.694428Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-07-16T14:02:31.882615Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-07-16T14:02:32.331478Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-07-16T14:02:32.331559Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-07-16T14:02:32.334663Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. 2023-07-16T14:02:32.367684Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2023-07-16T14:02:32.367707Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.33' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL. 2023-07-16T14:07:21.221136Z 0 [System] [MY-013172] [Server] Received SHUTDOWN from user <via user signal>. Shutting down mysqld (Version: 8.0.33). 2023-07-16T14:07:22.110930Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.33) MySQL Community Server - GPL. 2023-07-16 14:07:32+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.33-1.el8 started. 2023-07-16 14:07:32+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' 2023-07-16 14:07:32+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.33-1.el8 started. '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock' 2023-07-16T14:07:33.176975Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead. 2023-07-16T14:07:33.178454Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.33) starting as process 1 2023-07-16T14:07:33.185757Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-07-16T14:07:33.376968Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-07-16T14:07:33.689001Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-07-16T14:07:33.689518Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-07-16T14:07:33.693007Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. 2023-07-16T14:07:33.743641Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2023-07-16T14:07:33.744479Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.33' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL.
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docker exec
Get into the terminal of the container.

docker exec -it 0dacb1101ad3 /bin/bash bash-4.4# ls bin boot dev docker-entrypoint-initdb.d entrypoint.sh etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var bash-4.4# exit exit
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-it refers to interactive.

docker image rm
Removes an image. Image name along with tag should be mentioned in the command.

docker image rm mysql:8.0.33 -f Untagged: mysql:8.0.33 Untagged: mysql@sha256:232936eb036d444045da2b87a90d48241c60b68b376caf509051cb6cffea6fdc Deleted: sha256:041315a161837f8bb87361e13390abda7159b98aeedee5e6152a0bb7a9b45f27
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