Docker and Docker Compose

We use Docker Desktop for Mac.

Docker CLI management commands start with docker, then a space, then the management category, then a space, and then the command. A flag with two dashes in front is the full name of the flag. A flag with one dash is a shortcut for the full flag name.

To list all running containers:

docker container ls

To check an environment variable inside your container:

docker container exec [name] printenv [variable]

For example:

docker container exec serendipity-web-bff printenv SERENDIPITY_HOSTNAME

To check the environment variables inside your container:

docker container inspect -f \
  '{{range $index, $value := .Config.Env}}{{println $value}}{{end}}' \
  [name] | grep [value]

For example:

docker container inspect -f \
  '{{range $index, $value := .Config.Env}}{{println $value}}{{end}}' \
  serendipity-web-bff | grep SPRING

To print logs:

docker container logs [name]

For example:

docker container logs nginx
docker container logs serendipity-identity-service
docker container logs serendipity-party-service
docker container logs serendipity-storage-service
docker container logs serendipity-web-bff
docker container logs pgadmin

docker logs --tail 100 nginx
docker logs --tail 100 serendipity-identity-service

To start a shell session inside your container that you can interact with through your terminal:

docker container exec -it [name] /bin/bash

-i is short for --interactive. Keep STDIN open even if unattached. -t is short for --tty. Allocates a pseudo terminal that connects your terminal with the container’s STDIN and STDOUT.

For example:

docker container exec -it serendipity-web-bff

You can stop a container using the following command:

docker container stop [name]

For example:

docker container stop pgadmin

You can remove a container using the following command:

docker container rm [name]

For example:

docker container rm pgadmin

Where is your image? It’s in your machine’s local Docker image registry:

docker image ls

Misc:

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_name_or_id>
docker container ps -a
docker container ls
docker image ls
docker volume ls