I want to do this! Reverse lookup docker command when

Hello.
I'm Mandai, in charge of Wild on the development team.

I often forget docker commands, so I wrote this in a fit of anger.
Now I won't forget them again.

 

Get a list of Docker images

docker images

 

Get a list of Docker containers

# Only currently running Docker containers docker ps # All Docker containers including stopped Docker containers docker ps -a # Display only Docker container IDs docker ps -q

 
"docker ps -q" has no use on its own, but it is useful when deleting docker containers in bulk

It may be difficult to imagine at first what the difference is between a docker image and a docker container, but it's like the relationship between a physical CD and an ISO file (which is hard to understand)

 

Name and start a docker container

docker run --name [container name]

 
If you name a Docker container, you must remove it with the "docker rm" command before you can start a Docker container with the same name

 

Share files between docker container and host

docker run -v [host directory path]:[docker container directory path]

 

Port forwarding to make the Docker container port available on the host

docker run -p [host port number]:[docker container port number]

 

Connecting Docker containers

docker run -link [docker container name or ID][:[alias]]

 
Aliases are useful when you don't have a name for your docker container or you have a super long docker container name

The mechanism is simple, using hosts. If you compare the hosts files, you will see the following:

# Start the MySQL container to connect to $ docker run -d --name test -e MYSQL_ROOT_PASSWORD=root mysql:latest 529c5facaed9694dbcb36e9e3d3eae0350e26e182f70c72b06d2914dcf8c0222 # Start the Docker container with the name and alias specified in the link destination $ docker run -it --link test:db php:latest cat /etc/hosts 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.3 db 529c5facaed9 test 172.17.0.4 ffae57a81bc1 # Start a Docker container by specifying only the name as the link destination $ docker run -it --link test php:latest cat /etc/hosts 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.3 test 529c5facaed9 172.17.0.4 128c598dea8a

 
The difference is whether the alias is listed in the hosts file or not

 

Start a docker container in detached mode

docker run -d [docker image name]

 Detached mode is a state where the container does not enter the container and runs in the background.
I thought it was a daemon.

 

Run a Docker container in the foreground and run any command

docker run [docker image name] [command] 

 

Start a docker container in the foreground and attach to the docker container

docker run -it [docker image name] [any shell such as /bin/bash]

 The -i option attaches STDIN (standard input). In other words, input from the console will flow into the specified Docker container.
If you use "docker run -i hogehoge /bin/bash", you can type console commands, but they will not be reflected on the screen.

The -t option assigns a TTY to the Docker container. Without this, you will not be able to see the console in the Docker container even if you attach.
If you run "docker run -t hogehoge /bin/bash", you will see the prompt in the Docker container, but typing will not be reflected on the screen.

So, to work inside a Docker container, you need both of the above options

 

Set environment variables in a Docker container on startup

docker run -e [variable name=value]

 
This will allow you to specify the root password for mysql

docker run -e MYSQL_ROOT_PASSWORD=root

 

Attach to a running Docker container

docker attach [docker container ID]

 
To detach from a Docker container, use the shortcut keys CTRL + P, Q to return to the host

 

I want to run a shell command in a Docker container

docker exec [docker container ID] [/bin/bash or other shell to launch]

 

I want to stop a docker container

docker stop [docker container ID]

 

I want to delete a docker container

docker rm [docker container ID]

 

I want to delete all the Docker containers

docker rm $(docker ps -aq)

 
This is a way to get the Docker container ID in a subshell. The -q option of docker ps is the best use case

 

I want to delete a docker image

docker rmi [docker image name]

 

I want to know information about Docker containers

docker inspect [docker container ID]

 

If you want to get the IP address used by a Docker container (this comes with some extra information, but it serves the purpose)

docker inspect [docker container ID] | grep IPAddress

 

 
That's it.