docker.md

Check if PID outside Docker corresponds to PID inside Docker

grep -i pid /proc/${PID_OUTSIDE_DOCKER}/status
# then look at NSpid line to see if it contains the PID inside Docker

https://stackoverflow.com/questions/52021956/get-internal-docker-pid-by-system-pid

sudo-less access

sudo usermod -aG docker $USER
newgrp docker

List all containers

docker container ls -a

https://docs.docker.com/engine/reference/commandline/container_ls/

Stop a container

# SIGTERM first, then SIGKILL after 10 seconds
docker stop <container>

# SIGKILL right off the bat
docker kill <container>

https://www.ctl.io/developers/blog/post/gracefully-stopping-docker-containers/

View image details

docker image inspect <IMAGE_NAME>

https://docs.docker.com/engine/reference/commandline/image_inspect/

View logs

docker ps  # to see running contains
docker logs <CONTAINER_ID>

Up, run, start

Generally want to use up to start everything. run is for running specific services and their dependencies. start is for starting stopped services.

https://docs.docker.com/compose/faq/#whats-the-difference-between-up-run-and-start

Example Commands

Remember to start Docker program in Applications first.

docker image load -i <file>

docker images

# -i means interactive
# -t means "Allocate a pseudo-TTY"
docker run -it <rhel-image> bash