Managing Docker containers

Tested Infrastructure

<table class="tg"> <tr> <th class="tg-yw4l">Platform</th> <th class="tg-yw4l">Number of Instance</th> <th class="tg-yw4l">Reading Time</th> </tr> <tr> <td class="tg-yw4l"> Play with Docker</td> <td class="tg-yw4l">1</td> <td class="tg-yw4l">5 min</td> </tr> </table>

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

Proceed » What is Dockerfile

Beginners Track - Managing Docker containers

Managing Docker containers

Tested Infrastructure

Pre-requisite

Preparations

Instructions