Docker is a platform that lets you package applications and their dependencies into lightweight, portable containers that can run consistently across different environments. Here are some of the commands that I routinely use.

Basic commands

Build an image:

docker build -t alango/node-hello .

Run the image:

docker run -it 
  --rm -d -p 8080:80 
  --name hello 
  -e WHO="laura" alango/node-hello

“ssh” into the container:

docker exec -t -i 7c21fb1cad24 /bin/bash

Push images to Docker Hub:

docker tag local-image:tagname new-repo:tagname
docker push new-repo:tagname

Starting a shell inside the container:

docker exec -it b403b7b43afe /bin/bash

List all containers.

docker ps

Docker on Azure

Create a container:

az container create 
  --resource-group enterpos 
  --name mycontainer 
  --image mcr.microsoft.com/azuredocs/aci-helloworld 
  --dns-name-label aci-demo-alanboy 
  --ports 80

az container show 
  --resource-group enterpos 
  --name mycontainer 
  --query "{FQDN:ipAddress.fqdn,ProvisioningState:provisioningState}" 
  --out table

https://docs.microsoft.com/en-us/azure/container-instances/container-instances-quickstart

Docker on AWS

https://docs.aws.amazon.com/AmazonECS/latest/developerguide/Welcome.html https://us-west-2.console.aws.amazon.com/ecs/home?region=us-west-2#/getStarted

more

docker stop: Stop a running container (send SIGTERM, and then SIGKILL after grace period) […] The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL. [emphasis mine]

docker kill: Kill a running container (send SIGKILL, or specified signal) […] The main process inside the container will be sent SIGKILL, or any signal specified with option –signal. [emphasis mine]

https://www.digitalocean.com/community/tutorials/how-to-optimize-docker-images-for-production https://docs.docker.com/develop/dev-best-practices/