Docker Commands for DevOps

docker –version:get the currently installed version of docker

  ubuntu@ip-172-31-31-147:~$ docker --version
  Docker version 20.10.21, build 20.10.21-0ubuntu1~22.04.3

docker pull:pull images from the docker repository(hub.docker.com)

  ubuntu@ip-172-31-31-147:~$ docker pull ubuntu

docker run:create a container from an image.

  docker run --env MYSQL_ROOT_PASSWORD=my-secret-pw --detach mysql

  ubuntu@ip-172-31-31-147:~$docker run -it -d ubuntu

docker ps:list the running containers.

  ubuntu@ip-172-31-31-147:~$ docker ps
  CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

docker ps -a:show all the running and exited containers.

  ubuntu@ip-172-31-31-147:~$ docker ps -a
  CONTAINER ID   IMAGE           COMMAND                  CREATED      STATUS                    PORTS     NAMES
  39bf6796afdd   mongo           "docker-entrypoint.s…"   2 days ago   Exited (0) 2 days ago               mongo
  e597aad3892c   my-app:latest   "python app.py"          2 days ago   Exited (137) 2 days ago             my-app-container
  c5f57ccd5ee5   busybox         "sh"                     3 days ago   Exited (0) 3 days ago               my-busy-box
  8052135aa2fe   nginx           "/docker-entrypoint.…"   3 days ago   Exited (0) 2 days ago               nginx-custom-2
  431e5f9ee070   nginx           "/docker-entrypoint.…"   3 days ago   Exited (0) 2 days ago               nginx-custom-1
  886d56933ea5   nginx           "/docker-entrypoint.…"   3 days ago   Exited (0) 2 days ago               nginx-default

docker exec:access the running container.

docker exec -it <container id> bash(or sh)

  docker exec -it test_db bash
  mysql -uroot -pmy-secret-pw
  SHOW DATABASES;

  ubuntu@ip-172-31-31-147:~$ docker exec -it e597aad3892c bash

docker stop:stops a running container.

docker stop <container id>

  ubuntu@ip-172-31-31-147:~$ docker stop c5f57ccd5ee5
  c5f57ccd5ee5

docker kill:kills the container by stopping its execution immediately. The difference between ‘docker kill’ and ‘docker stop’ is that ‘docker stop’ gives the container time to shutdown gracefully, in situations when it is taking too much time for getting the container to stop, one can opt to kill it.

docker kill <container id>
```
  ubuntu@ip-172-31-31-147:~$ ^Ccker kill c5f57ccd5ee5
```
docker commit:

docker commit <conatainer id> <username/imagename>

This command is used to create or save an image of the edited container on the local system.
```
  ubuntu@ip-172-31-31-147:~$ docker commit c5f57ccd5ee5 ubuntu
  sha256:a0b163c8b65d160dd8c0f02b2f4d65ae75648b3ab33baf3538650d1ec0a42b84
```

docker login:login to the docker hub repository

  ubuntu@ip-172-31-31-147:~$ docker login
  Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
  Username: gouutam
  Password: 
  WARNING! Your password will be stored unencrypted in /home/ubuntu/.docker/config.json.
  Configure a credential helper to remove this warning. See
  https://docs.docker.com/engine/reference/commandline/login/#credentials-store

  Login Succeeded

docker push:

docker push <username/image name>

This command is used to push an image to the docker hub repository
```
  ubuntu@ip-172-31-31-147:~$ docker push gouutam/mongo
```

docker images:lists all the locally stored docker images

  ubuntu@ip-172-31-31-147:~$ docker images
  REPOSITORY   TAG         IMAGE ID       CREATED         SIZE
  ubuntu       latest      a0b163c8b65d   3 minutes ago   4.26MB
  my-app       latest      55326f26c9c6   2 days ago      98.4MB
  mongo        latest      fb5fba25b25a   3 days ago      654MB
  nginx        latest      021283c8eb95   12 days ago     187MB
  ubuntu       <none>      5a81c4b8502e   2 weeks ago     77.8MB
  busybox      latest      5242710cbd55   2 weeks ago     4.26MB
  python       alpine3.7   00be2573e9f7   4 years ago     81.3MB

docker rm:

docker rm <container id>

This command is used to delete a stopped container
```
  ubuntu@ip-172-31-31-147:~$ docker rm 39bf6796afdd
  39bf6796afdd
```
docker rmi:

docker rmi <image-id>

This command is used to delete an image from local storage
```
  ubuntu@ip-172-31-31-147:~$ docker rmi 00be2573e9f7
```

docker build:

docker build <path to docker file>

This command is used to build an image from a specified docker file

  ubuntu@ip-172-31-31-147:~$ docker build .

Docker search

The “docker search” command searches for specific images through the Docker hub.

  docker search MySQL
  NAME                            DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
  mysql                           MySQL is a widely used, open-source relation…   14318     [OK]       
  mariadb                         MariaDB Server is a high performing open sou…   5466      [OK]       
  phpmyadmin                      phpMyAdmin - A web interface for MySQL and M…   835       [OK]       
  percona                         Percona Server is a fork of the MySQL relati…   617       [OK]       
  bitnami/mysql                   Bitnami MySQL Docker Image                      93                   [OK]
  databack/mysql-backup           Back up mysql databases to... anywhere!         88                   
  ubuntu/mysql                    MySQL open source fast, stable, multi-thread…   51                   
  linuxserver/mysql-workbench                                                     50                   
  linuxserver/mysql               A Mysql container, brought to you by LinuxSe…   38                   
  circleci/mysql                  MySQL is a widely used, open-source relation…   29                   
  google/mysql                    MySQL server for Google Compute Engine          23                   [OK]
  rapidfort/mysql                 RapidFort optimized, hardened image for MySQL   23                   
  rapidfort/mysql8-ib             RapidFort optimized, hardened image for MySQ…   9                    
  rapidfort/mysql-official        RapidFort optimized, hardened image for MySQ…   7                    
  bitnami/mysqld-exporter                                                         5                    
  drupalci/mysql-5.5              https://www.drupal.org/project/drupalci         3                    [OK]
  newrelic/mysql-plugin           New Relic Plugin for monitoring MySQL databa…   1                    [OK]
  vitess/mysqlctld                vitess/mysqlctld                                1                    [OK]
  hashicorp/mysql-portworx-demo                                                   0                    
  docksal/mysql                   MySQL service images for Docksal - https://d…   0                    
  mirantis/mysql                                                                  0                    
  bitnamicharts/mysql                                                             0                    
  eclipse/mysql                   Mysql 5.7, curl, rsync                          0                    [OK]
  cimg/mysql                                                                      0                    
  drupalci/mysql-5.7              https://www.drupal.org/project/drupalci         0

Docker restart

This command is used to restart the stopped container. It is recommended to use this after rebooting the system. Here is how to do it –
```
  docker restart f8c52bedeecc
```

Docker network

The ‘docker network’ command is used to know the details of the list of networks in the cluster.

  $ docker network ls
  NETWORK ID          NAME                DRIVER              SCOPE
  85083e755f04        bridge              bridge              local
  f51d1f2379e0        host                host                local
  5e5d9a154c00        none                null                local
  Apart from this, you can also use the following docker network commands to manage networks -
  Connect  - to connect a container to a network
  Disconnect - to disconnect a container from a network
  Create  - to create a network
  Ls - to list all networks
  Inspect - to display detailed information on one or more networks
  prune - to remove all unused networks
  rm - to remove one or more networks
  Docker history

Docker history :This command is used to check the history of a docker image. The image name has to be mentioned while using the command. Here is how to use it -
```
  $ docker history httpd
```
Docker copy:This command copies a file from docker to the local system.
Docker logs :This command is used to check the logs of all the docker containers with the corresponding contained id mentioned in the command.
```
  docker logs 09ca6feb6efc
```

Docker volume:This command creates a volume so that the docker container can use it to store data.

  ubuntu@ip-172-31-31-147:~$ docker volume create
  e22d43790c191cad19a2f0f93dbedda11314c5ad82ec800f009b2760ae6a3257

  ubuntu@ip-172-31-31-147:~$ docker volume ls
  DRIVER    VOLUME NAME
  local     9ecee412205e8b382358be5768dd7b77c60df9362e17a5485fdfe8070044b800
  local     20d795020d2cb4353ef6935e53fc4a2ed1add3c108bc2a9d2422813930afd801
  local     423b3b73617a54915ca5e5ae65fda2f53c58457035f21ec44478b8440788390a
  local     e22d43790c191cad19a2f0f93dbedda11314c5ad82ec800f009b2760ae6a3257
  local     f5128f24c4f5d0db15c6eb6f7e879a9356318fcb9d773ee6a0887276bfab067a

Docker logout :This command will log you out of the docker hub.

  ubuntu@ip-172-31-31-147:~$ docker logout
  Removing login credentials for https://index.docker.io/v1/

Docker Commands for DevOps

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