Docker networking #notetoself

Networking

• List network setup: docker network ls
• List: docker network inspect -f '{{range .IPAM.Config}}{{.Subnet}}{{end}}' [networkid]
• List IPs of all containers.  docker network inspect -f '{{json .Containers}}' [networkid] | jq '.[] | .Name + ":" + .IPv4Address'
• View host setup: docker exec [nameofnode] cat /etc/hosts
• Running a named container: docker run -name api1 -p 8080:80 gcp-api

Installing ping in the container: https://stackoverflow.com/questions/39901311/docker-ubuntu-bash-ping-command-not-found
Setting up a network:
https://www.digitalocean.com/community/questions/how-to-ping-docker-container-from-another-container-by-name

Docker networking for Dummies (like me) https://www.freecodecamp.org/news/how-to-get-a-docker-container-ip-address-explained-with-examples/

Classic Setup (web, api, sql)

Setting up the classical environment of having the following 3 components, Web, API, SQL

• Run all as named containers (web1, api1, sql1)
• Create the network: docker create myNet
• Add the containers to the network:
  • docker network connect myNet web1
  • docker network connect myNet api1
  • docker network connect myNet websql1
• Check that the network is as expected: docker network inspect myNetwork
• More: https://www.digitalocean.com/community/questions/how-to-ping-docker-container-from-another-container-by-name

A few extra notes

A note to self. Use remote command bash when the docker attach command hangs: docker exec -it [container-id] bash