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 about docker commands, so I wrote this out of anger.
I'll never forget this.

 

I want to get a list of docker images

docker images

 

I want to get a list of docker containers

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

 
"docker ps -q" is useless as a single item, but it is useful when deleting docker containers in bulk.

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

 

Start a docker container with a name

docker run --name [container name]

 
If you give a name to a docker container, to start a docker container with the same name, you must remove the docker container with the "docker rm" command.

 

Share files between docker container and host

docker run -v [directory path on host side]:[directory path inside docker container]

 

Port forward the docker container port so that it can also be used on the host side

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

 

Connect docker containers

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

 
Aliases are useful if you haven't named your docker container, or if you have a very long docker container name.

The mechanism is simple using hosts, and if you compare the hosts files, it will look like the following.

# Start the MySQL container to connect $ docker run -d --name test -e MYSQL_ROOT_PASSWORD=root mysql:latest 529c5facaed9694dbcb36e9e3d3eae0350e26e182f70c72b06d2914dcf8c0222 # Start the docker container by specifying the name and alias for 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 the docker container by specifying only the name in 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 or not the alias is listed in hosts.

 

Start a docker container in detached mode

docker run -d [docker image name]

 Detach mode is a state in which the program runs in the background without entering the container.
I totally thought it was Demon's d.

 

Start a docker container in the foreground and execute any command

docker run [docker image name] [command] 

 

Start docker container in foreground and attach to docker container

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

 -i option attaches STDIN (standard input). In other words, input from the console will flow into the specified docker container.
If you type "docker run -i hogehoge /bin/bash", you can run the console command, but it 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 inside the docker container even if you attach it.
If you type "docker run -t hogehoge /bin/bash", you can see the prompt inside the docker container, but the input you enter will not be reflected on the screen.

Therefore, in order to work inside a docker container, both of the above two options are required.

 

Set environment variables inside docker container at startup

docker run -e [variable name=value]

 
You can specify the mysql root password etc. with this.

docker run -e MYSQL_ROOT_PASSWORD=root

 

Attach to a running docker container

docker attach [docker container ID]

 
To detach, return to the host using the shortcut key CTRL + P, Q inside the docker container.

 

I want to run a shell command inside a docker container

docker exec [docker container ID] [shell to start, such as /bin/bash]

 

I want to stop the docker container

docker stop [docker container ID]

 

I want to delete the docker container

docker rm [docker container ID]

 

I want to delete all docker containers

docker rm $(docker ps -aq)

 
This is how to get the ID of the docker container using a subshell. The -q option of docker ps is the most useful.

 

I want to delete the 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 the docker container (additional information is also included, but the purpose is achieved)

docker inspect [docker container ID] | grep IPAddress

 

 
That's it.