Managing Docker containers

Tested Infrastructure

Platform	Number of Instance	Reading Time
Play with Docker	1	5 min

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
```