Managing Docker Containers

If docker is installed and the docker.service enabled, then a great way to test the ability to run a container is to use the docker subcommand run with a simple image like hello-world. The busybox image is another simple image that we will pull and run a command in. The ps subcommand is useful for viewing running or all containers, and images will list the images in the local repository. Using the rm subcommand we can remove containers and with rmi images.

sudo -i
docker run hello-world
docker run --name hi hello-world
docker search busybox
docker pull docker.io/busybox
docker run --name busy -it busybox /bin/sh
exit
docker ps -a # shows a <name> for hello-world
docker rm <name>
docker rm hi
docker ps -a
docker images
docker rmi hello-world
docker images

Use docker run to create a container named apache2, based upon the httpd:2.4 image, and map the HTTP port with -p 8080:80.

docker run --name apache2 -p 8080:80 httpd:2.4 
#Use CTRL+C to exit output from running container
docker ps
docker ps -a
docker start apache2
docker logs apache2
docker stats apache2
CTRL+C
lynx -dump http://localhost:8080

docker exec -it apache2 bash
ls
cd htdocs
echo 'apache2 container' > index.html
exit
lynx -dump http://localhost:8080
docker commit -m 'Updated index.html' apache2

docker ps
docker stop apache2
docker ps -a
docker start apache2
lynx -dump http://localhost:8080