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Docker

Containerization for the cloud, or your personal computer.

Detached Mode

You can run the containers in the background, which is probably cleaner for the typical end User. When running the command to lift the stack, add the -d detached mode flag:

$ docker-compose up -d

Lookup Detached Containers

Look up active containers with the ps command:

$ docker ps

Attach Detached Container

To see a live feed of the container’s log, using a container ID ie:

$ docker attach 7b3e96546fe7

Stop Detached Container

Turn off individual containers, gracefully, by copying/pasting their Container ID into this command, for example:

$ docker stop 7b3e96546fe7

View Detached Container Log

Shows a container’s command’s STDOUT and STDERR (print outs including errors ie NodeJS console log messages).

$ docker logs 7b3e96546fe7

Attach to Container

$ docker attach 7b3e96546fe7

Troubleshooting

Host already being used

It’s possible to leak containers after closing the terminal, maybe due to a separate glitch in the system, but if that happens, you can look up the containers running in the background with this command:

$ docker ps


CONTAINER ID   IMAGE             COMMAND                  CREATED       STATUS          PORTS                                                                                            NAMES
7b3e96546fe7   project_container   "docker-entrypoint.s…"   11 days ago   Up 10 seconds   0.0.0.0:4200->4200/tcp, :::4200->4200/tcp                                                        project_container_1
738c844f9922   project_container2   "docker-entrypoint.s…"   11 days ago   Up 8 seconds    0.0.0.0:8080->8080/tcp, :::8080->8080/tcp                                                        project_container2_1
71d7830cc617   project_container3      "docker-entrypoint.s…"   12 days ago   Up 9 seconds    0.0.0.0:1337->1337/tcp, :::1337->1337/tcp                                                        project_container3_1
58e9ee55fd32   neo4j:4.4         "tini -g -- /startup…"   2 weeks ago   Up 9 seconds    0.0.0.0:7474->7474/tcp, :::7474->7474/tcp, 7473/tcp, 0.0.0.0:7687->7687/tcp, :::7687->7687/tcp   voyager_neo4j_1

It will list every container running. Then turn off each with the kill command by refering the container ID for each:

$ docker kill 7b3e96546fe7