1. Install docker and docker-compose on Ubuntu
sudo apt-get update
sudo apt install docker.io
sudo apt install docker-compose
2. Configure rootless user to run docker
sudo groupadd docker
sudo usermod -aG docker $USER
# Linux user can run below to activate the changes
newgrp docker
docker ps
https://docs.docker.com/engine/install/linux-postinstall/
3. List and delete images
docker images
docker iamge ls
docker rmi <image_id_1> <image_id_2>
4. Check if the specific docker image exists
IMAGE_ID=$(docker images | grep 'portainer/base' | awk '{ print $3 }')
if [[ -n ${IMAGE_ID} ]]; then
docker rm -f ${IMAGE_ID};
fi
5. Login remote registry
# Default is dockerhub. username is docker hub id
docker login
# Login the specific registry
docker login registry.private.com
6. Build image from Dockerfile
docker build -t <user>/<repo>:<tag> -f Dockerfile .
7. Push the local image to remote registry
docker image push <user>/<repo>:<tag>
# Push to the private registry
docker push registry.private.com/<repo>:<tag>
8. Add and view the docker volume
# add volume
docker volume create <volume_name>
# view volume
docker volume ls
sudo ls /var/lib/docker/volumes
9. Check the volume detail
docker volume inspect <volume_name>
10. Test docker container service connection with curl
ping the http service
curl 127.0.0.1:9000
ping the https service
curl -k https://127.0.0.1:9443
11. Run up a container
docker container run <image_name>
# i.e.
docker container run hello-world
# If we want to see the directory listing after running the container, we can do with
docker container run alpine ls -l
# If we want to run an interactive shell, we can do with
docker container run -it alpine /bin/sh
# list all the running container instances
docker container ls
# list all the conatiner instances
docker container ls -a
12. Check which docker registries have been logged in
cat ~/.docker/config
13. Create TLS certificate and key
# Before using the commands, we must enable docker swarm
docker swarm init
docker secret create domain.crt certs/domain.crt
docker secret create domain.key certs/domain.key
14. Remove image from docker registry
# Remove image from private registry
docker image remove registry.private.com/<repo>
15. Pull image from private registry
docker pull registry.private.com/<repo>
16. List docker image with sha256
docker images --digests
17. Remove the dangling images
Danging image are the ones with the <none> repository name
docker rmi $(docker images -f "dangling=true" -q)
18. Copy files from container to host
docker cp <containerId>:/file/path/within/container /host/path/target
19. Get container’s IP address
docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' portainer_agent
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