vkroz/Docker cheatsheet.md

## Docker cheatsheet.md

      
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              Docker cheatsheet.md
            
          
    Docker playground: https://labs.play-with-docker.com/
Build image

tag coud be enything, it should help to identify application and its version, e.g.
# Build image, can use multiple tags
docker build . -t ${tag1} -t ${tag2} ${buildArgs}

# Push to repo
docker push gcr.io/my-proj/my-app:latest gcr.io/my-proj/my-app:1.0.5

Operating containers


List all running images: docker ps
Run container

docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:6.6.0

to run in background, detached -- use -d option, e.g.
docker run -d -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:6.6.0


SSH into a running container

docker ps
docker exec -it {{container id}} /bin/bash 


Run bash on image

docker images
docker run -it --entrypoint /bin/bash {{image id}}


Get logs from running container

sudo docker logs 4bedab917a00

follow log changes
sudo docker logs -f 4bedab917a00

GCR

# List apps
gcloud container images list --repository gcr.io/my-proj

# List app versions
gcloud container images list-tags gcr.io/my-proj/my-app

Frequent troubles


Problem: Docker is running, but gives Cannot connect to the Docker daemon on any command, e.g.

$ docker ps
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

Solution: try to run same command with sudo, e.g. sudo docker os