Managing Docker containers

Tested Infrastructure

Pre-requisite

• Create an account with DockerHub
• Open PWD Platform on your browser
• Click on Add New Instance on the left side of the screen to bring up Alpine OS instance on the right side

Preparations

• Clean your docker host using the commands (in bash):

$ docker rm -f $(docker ps -a -q)

Instructions

• Run the following containers from the dockerhub:

$ docker run -d -p 5000:5000 --name app1 selaworkshops/python-app:1.0

$ docker run -d -p 5001:5001 -e "port=5001" --name app2 selaworkshops/python-app:2.0 * Ensure the containers are running:

$ docker ps * Stop the first container:

$ docker stop app1 * Kill the second container:

$ docker kill app2 * Display running containers:

$ docker ps * Show all the containers (includind non running containers):

$ docker ps -a * Let’s start both containers again:

$ docker start app1 app2 * Restart the second container:

$ docker restart app2 * Display the docker host information with:

$ docker info * Show the running processes in the first container using:

$ docker top app1 * Retrieve the history of the second container:

$ docker history selaworkshops/python-app:2.0 * Inspect the second container image:

$ docker inspect selaworkshops/python-app:2.0 * Inspect the first container and look for the internal ip:

$ docker inspect app1

"Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "822cb66790c6358d9decab874916120f3bdeff7193a4375c94ca54d50832303d", "EndpointID": "9aa96dc29be08eddc6d8f429ebecd2285c064fda288681a3611812413cbdfc1f", "Gateway": "172.17.0.1", "IPAddress": "172.17.0.3", "IPPrefixLen": 16, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:11:00:03", "DriverOpts": null } } * Show the logs of the second container using the flag –follow:

$ docker logs --follow app2 * Browse to the application and see the containers logs from the terminal:

http://localhost:5001 * Stop to tracking logs:

$ CTRL + C