Steps

1. Create a network named "test"

   docker network create test

2. Create two containers using the network

   docker run --name c1 --network "test" --rm --entrypoint tail mongo -f
   docker run --name c2 --network "test" --rm --entrypoint tail mongo -f

3. Enter one container to ping the other and it will work

   docker exec -it c1 bash

   apt-get install iputils-ping  # install command ping

   root@79568c5ce391:/usr/src/app# ping c2
   PING c2 (172.18.0.3) 56(84) bytes of data.
   64 bytes from c2.test (172.18.0.3): icmp_seq=1 ttl=64 time=0.137 ms
   64 bytes from c2.test (172.18.0.3): icmp_seq=2 ttl=64 time=0.221 ms
   64 bytes from c2.test (172.18.0.3): icmp_seq=3 ttl=64 time=0.232 ms
   ...

Notes

Using default network or "bridge" network does not work:

docker run --name c1 --rm --entrypoint tail web_scraper:v1 -f
docker run --name c2 --rm --entrypoint tail web_scraper:v1 -f

docker run --name c1 --network "bridge" --rm --entrypoint tail web_scraper:v1 

$ docker run -p 127.0.0.1:80:8080/tcp ubuntu bash

This binds port 8080 of the container to TCP port 80 on 127.0.0.1 of the host machine. You can also specify udp and sctp ports.

$ docker run --expose 80 ubuntu bash

This exposes port 80 of the container without publishing the port to the host system’s interfaces.

Images

docker images
docker build -t image_name .
docker rmi $(docker images | grep "^<none>" | awk "{print $3}")  # remove all untagged images
docker save image_name > image_name.tar  # save image as a tar file
docker load < busybox.tar.gz  # load image

Containers

docker run -p 27017:27017 -v mongodbdata:/data/db mongo
docker ps -a
docker exec -it ubuntu_bash bash
docker rm container_name
docker rm $(docker ps -a -q)  # remove all stopped containers

Volumes

docker volume create mongodbdata
docker volume ls
docker volume inspect mongodbdata

Networks

docker network ls
docker network create network_name
docker network inspect network_name
docker network rm network_name

Azure Container Instance

docker login azure --tenant-id 8432da0f-f8af-4b02-b318-4c777cfab498
docker context create aci hpjacicontext
docker context use hpjacicontext
docker compose up

Docker compose

docker-compose up --detach --force-recreate