docker commands

Running containers

Run a docker container with volume mapped to current dir

docker run -p 3000:3000 -v $(pwd):/app -d --name=node-api node-api

The above command bind mounts the current dir in host machine to /app dir inside container However, we might not want to keep node_modules in host machine and use the one inside container To avoid the first bind mound from overriding the node_modules inside container, we can create another volume

docker run -p 3000:3000 -v $(pwd):/app -v /app/node_modules -d --name=node-api node-api

Binding is a two way street. When we bind our local machine to docker container, any changes made inside the container also gets reflected. It is fine when you want those changes to be displayed in local machine but for the most part, we do not want this as this creates a security issue. To counter this, we can make bind mounts read only (ro) so that container can read the changes in host machine but can not change them.

docker run -p 3000:3000 -v $(pwd):/app:ro -v /app/node_modules -d --name=node-api node-api

Passing env variables

docker run -p 3000:3000 -v $(pwd):/app:ro -v /app/node_modules --env PORT=4000 -d --name=node-api node-api

As a file

docker run -p 3000:3000 -v $(pwd):/app:ro -v /app/node_modules --env-file ./.env -d --name=node-api node-api

Removing volumes together with the container

docker rm node-app -fv

Get details about a container

docker inspect container-name

Scale the server

docker-compsoe -f docker-compose.yml --scale api-server=${number_of_instances}

Push an image to DockerHub

Rename the image to the one created in Docker Hub

docker image tag docker-previous-image docker-new-image-name(from docker hub)

Build and push the image to Docker Hub

docker-compose -f docker-compose.yml -f docker-compose.prod.yml build node-api

docker-compose -f docker-compose.yml -f docker-compose.prod.yml push augini/docker-node-app

Pull the image in production server

docker-compose -f docker-compose.yml -f docker-compose.prod.yml pull

Start the services in production server

docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

Commands to work with docker swarm

Initialize the docker swarm

docker swarm init <ip-addr-string>

List the services

docker service ls
docker service ps

Deploy the services using docker swarm

docker stack deploy -c docker-compose.yml -c docker-compose.prod.yml docker-node

Remove the stack

docker stack rm demo