RH199 - ch16s06

On the workstation machine, run the lab containers-managing 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-managing start

Procedure 16.2. 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 ~]$ 
```

Display the container registry configuration file and view configured registries.

[student@servera ~]$ cat /home/student/.config/containers/registries.conf
unqualified-search-registries = ['registry.lab.example.com']

[[registry]]
location = "registry.lab.example.com"
insecure = true
blocked = false

Search the registry for images with a name that starts with "ubi" using the podman search command.

[student@servera ~]$ podman search registry.lab.example.com/ubi
INDEX         NAME                            DESCRIPTION   STARS   OFFICIAL
example.com   registry.lab.example.com/ubi7/ubi           0
example.com   registry.lab.example.com/ubi8/ubi           0

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

Use the skopeo inspect command to view information on an image in the registry before downloading it.

The following skopeo inspect command is very long and should be entered as a single line.

[student@servera ~]$ skopeo inspect docker://registry.lab.example.com/rhel8/httpd-24
...output omitted...
        "Config": {
            "User": "1001",
            "ExposedPorts": {
                "8080/tcp": {},
                "8443/tcp": {}
            },
            "Env": [
                "PATH=/opt/app-root/src/bin:/opt/app-root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "container=oci",
                "SUMMARY=Platform for running Apache httpd 2.4 or building httpd-based application",
                "DESCRIPTION=Apache httpd 2.4 available as container, is a powerful, efficient, and extensible web server. Apache supports a variety of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language support to authentication schemes. Virtual hosting allows one Apache installation to serve many different Web sites.",
                "STI_SCRIPTS_URL=image:///usr/libexec/s2i",
                "STI_SCRIPTS_PATH=/usr/libexec/s2i",
                "APP_ROOT=/opt/app-root",
                "HOME=/opt/app-root/src",
                "PLATFORM=el8",
                "HTTPD_VERSION=2.4",
                "HTTPD_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/httpd/",
                "HTTPD_APP_ROOT=/opt/app-root",
                "HTTPD_CONFIGURATION_PATH=/opt/app-root/etc/httpd.d",
                "HTTPD_MAIN_CONF_PATH=/etc/httpd/conf",
                "HTTPD_MAIN_CONF_MODULES_D_PATH=/etc/httpd/conf.modules.d",
                "HTTPD_MAIN_CONF_D_PATH=/etc/httpd/conf.d",
                "HTTPD_TLS_CERT_PATH=/etc/httpd/tls",
                "HTTPD_VAR_RUN=/var/run/httpd",
                "HTTPD_DATA_PATH=/var/www",
                "HTTPD_DATA_ORIG_PATH=/var/www",
                "HTTPD_LOG_PATH=/var/log/httpd"
            ],
            "Entrypoint": [
                "container-entrypoint"
            ],
            "Cmd": [
                "/usr/bin/run-httpd"
            ],
            "WorkingDir": "/opt/app-root/src",
...output omitted...

Pull a container image from the registry using the podman pull command.

[student@servera ~]$ podman pull registry.lab.example.com/rhel8/httpd-24
Trying to pull registry.lab.example.com/rhel8/httpd-24...
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

Use the podman images command to view locally stored images.

[student@servera ~]$ podman images
REPOSITORY                              TAG     IMAGE ID      CREATED      SIZE
registry.lab.example.com/rhel8/httpd-24 latest  7e93f25a9468  4 weeks ago  430 MB

Use the podman inspect command to view information about a locally stored image.

[student@servera ~]$ podman inspect registry.lab.example.com/rhel8/httpd-24
...output omitted...
        "Config": {
            "User": "1001",
            "ExposedPorts": {
                "8080/tcp": {},
                "8443/tcp": {}
            },
            "Env": [
                "PATH=/opt/app-root/src/bin:/opt/app-root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "container=oci",
                "SUMMARY=Platform for running Apache httpd 2.4 or building httpd-based application",
                "DESCRIPTION=Apache httpd 2.4 available as container, is a powerful, efficient, and extensible web server. Apache supports a variety of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language support to authentication schemes. Virtual hosting allows one Apache installation to serve many different Web sites.",
                "STI_SCRIPTS_URL=image:///usr/libexec/s2i",
                "STI_SCRIPTS_PATH=/usr/libexec/s2i",
                "APP_ROOT=/opt/app-root",
                "HOME=/opt/app-root/src",
                "PLATFORM=el8",
                "HTTPD_VERSION=2.4",
                "HTTPD_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/httpd/",
                "HTTPD_APP_ROOT=/opt/app-root",
                "HTTPD_CONFIGURATION_PATH=/opt/app-root/etc/httpd.d",
                "HTTPD_MAIN_CONF_PATH=/etc/httpd/conf",
                "HTTPD_MAIN_CONF_MODULES_D_PATH=/etc/httpd/conf.modules.d",
                "HTTPD_MAIN_CONF_D_PATH=/etc/httpd/conf.d",
                "HTTPD_TLS_CERT_PATH=/etc/httpd/tls",
                "HTTPD_VAR_RUN=/var/run/httpd",
                "HTTPD_DATA_PATH=/var/www",
                "HTTPD_DATA_ORIG_PATH=/var/www",
                "HTTPD_LOG_PATH=/var/log/httpd"
            ],
            "Entrypoint": [
                "container-entrypoint"
            ],
            "Cmd": [
                "/usr/bin/run-httpd"
            ],
            "WorkingDir": "/opt/app-root/src",
...output omitted...

Remove a locally stored image using the podman rmi command.

[student@servera ~]$ podman rmi registry.lab.example.com/rhel8/httpd-24
Untagged: registry.lab.example.com/rhel8/httpd-24:latest
Deleted: 7e93...7070

Run the podman images command to verify that the locally stored image is removed.

[student@servera ~]$ podman images
REPOSITORY   TAG   IMAGE ID   CREATED   SIZE

Exit from servera.

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

Finish

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

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

This concludes the guided exercise.

Revision: rh199-8.2-3beeb12