Docker CLI

container

• docker ps shows all running container

  • docker ps -a shows all existing container

• docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG...]

  • --name <container-name> gives the created container a custom name
  • --rm removes the container after stoping
  • -d detached mode - stops the container after main process exits usually not desired
  • -it for interactive processes - keep STDIN open (i), allocate a pseudo-tty (t)

• typical example for testing: docker run -it --rm --name test php:7.4 bash

• use bash in running container: docker exec -it containerName bash

network

• list networks docker network ls
• add a network connection docker network connect [OPTIONS] NETWORK CONTAINER

logs

docker logs --follow <container ID>

• --follow streams logs until command is killed (^c)
• --until=3s streams logs for 3 seconds
• --since 2019-03-02 show logs since specific date

build dockerfile

docker build .

• arguments

  • . build context (configs, mounts, ...)
  • -f dockerfile specifiy a custom dockerfile (independend from the build context)
  • -t vendor/image-name:version specify a name (and a version) for the build image
  • --no-cache build image without using caches
  • --build-arg var_name=test set ARG

• most used: docker build -t draab/image-name:latest .

best practice

• use user flag: --user $(id -u):$(id -g) to avoid problems on creating and accessing files