RH199 - ch16s04

On the workstation machine, run the lab containers-basic start command. This command runs a start script to determine whether the servera machine is reachable on the network. It also checks and configures the container registry and ensures that the container image used for this exercise is stored there.

[student@workstation ~]$ lab containers-basic start

Procedure 16.1. Instructions

Use the ssh command to log in to servera as the student user. The systems are configured to use SSH keys for authentication, so a password is not required.
```
[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$ 
```

Install the container-tools Yum module using the yum command.

[student@servera ~]$ sudo yum module install container-tools
[sudo] password for student: student
...output omitted...
Is this ok [y/N]: y
...output omitted...
Complete!

[student@servera ~]$ podman login registry.lab.example.com
Username: admin
Password: redhat321
Login Succeeded!

Pull a container image from the registry with the fully qualified name using the podman pull command.

[student@servera ~]$ podman pull registry.lab.example.com/rhel8/httpd-24:latest
Trying to pull registry.lab.example.com/rhel8/httpd-24:latest...
Getting image source signatures
Copying blob 77c58f19bd6e done
Copying blob 47db82df7f3f done
Copying blob 9d20433efa0c done
Copying blob 71391dc11a78 done
Copying config 7e93f25a94 done
Writing manifest to image destination
Storing signatures
7e93f25a946892c9c175b74a0915c96469e3b4845a6da9f214fd3ec19c3d7070

Run a container from the image, connect it to the terminal, assign it a name, and then start an interactive bash shell using the podman run command. The latest tag is assumed since no tag is specified:
The following podman run command is very long and should be entered as a single line.
```
[student@servera ~]$ podman run --name myweb -it registry.lab.example.com/rhel8/httpd-24 /bin/bash
bash-4.4$
```

List running processes within the container. You will see only those processes running in the container. You will not see any other processes that are running on the server.

bash-4.4$ ps aux
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
default        1  6.6  0.1  12020  3120 pts/0    Ss   21:52   0:00 /bin/bash
default        6  0.0  0.1  44596  3296 pts/0    R+   21:52   0:00 ps aux

Display the current user name and ID inside the container.

bash-4.4$ id
uid=1001(default) gid=0(root) groups=0(root)

Exit from the container shell.
```
bash-4.4$ exit
exit
```
Run the httpd -v command in a container, using the rhel8/httpd-24 container image, and delete the container when the command exits:
The following podman run command is very long and should be entered as a single line.
```
[student@servera ~]$ podman run --rm registry.lab.example.com/rhel8/httpd-24 httpd -v
Server version: Apache/2.4.37 (Red Hat Enterprise Linux)
Server built:   Dec  2 2019 14:15:24
```

Exit from servera.

[student@servera ~]$ exit
logout
Connection to servera closed.
[student@workstation ~]$

Finish

On the workstation machine, run the lab containers-basic finish script to complete this exercise.

[student@workstation ~]$ lab containers-basic finish

This concludes the guided exercise.

Revision: rh199-8.2-3beeb12