Red Hat System Administration II
In this exercise, you will use podman to retrieve, manage, and delete container images on your server.
Outcomes
You should be able to find, retrieve, inspect, and remove container images obtained from a remote container registry and stored on your server.
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 ~]$lab containers-managing start
Procedure 13.2. Instructions
Use the
sshcommand to log in toserveraas thestudentuser. The systems are configured to use SSH keys for authentication, so a password is not required.[student@workstation ~]$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.confunqualified-search-registries = ['registry.lab.example.com'] [[registry]] location = "registry.lab.example.com" insecure = true blocked = falseSearch the registry for images with a name that starts with "ubi" using the
podman searchcommand.[student@servera ~]$podman search registry.lab.example.com/ubiINDEX NAME DESCRIPTION STARS OFFICIAL example.com registry.lab.example.com/ubi7/ubi 0 example.com registry.lab.example.com/ubi8/ubi 0Log in to the container registry using the
podman logincommand.[student@servera ~]$podman login registry.lab.example.comUsername:adminPassword:redhat321Login Succeeded!Use the
skopeo inspectcommand to view information on an image in the registry before downloading it.The following
skopeo inspectcommand is very long and should be entered as a single line.[student@servera ~]$skopeo inspect docker://registry.lab.example.com/rhel8/httpd-24...output omitted... "Config": { "User": "1001", "ExposedPorts": { "8080/tcp": {}, "8443/tcp": {} }, "Env": [ "PATH=/opt/app-root/src/bin:/opt/app-root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "container=oci", "SUMMARY=Platform for running Apache httpd 2.4 or building httpd-based application", "DESCRIPTION=Apache httpd 2.4 available as container, is a powerful, efficient, and extensible web server. Apache supports a variety of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language support to authentication schemes. Virtual hosting allows one Apache installation to serve many different Web sites.", "STI_SCRIPTS_URL=image:///usr/libexec/s2i", "STI_SCRIPTS_PATH=/usr/libexec/s2i", "APP_ROOT=/opt/app-root", "HOME=/opt/app-root/src", "PLATFORM=el8", "HTTPD_VERSION=2.4", "HTTPD_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/httpd/", "HTTPD_APP_ROOT=/opt/app-root", "HTTPD_CONFIGURATION_PATH=/opt/app-root/etc/httpd.d", "HTTPD_MAIN_CONF_PATH=/etc/httpd/conf", "HTTPD_MAIN_CONF_MODULES_D_PATH=/etc/httpd/conf.modules.d", "HTTPD_MAIN_CONF_D_PATH=/etc/httpd/conf.d", "HTTPD_TLS_CERT_PATH=/etc/httpd/tls", "HTTPD_VAR_RUN=/var/run/httpd", "HTTPD_DATA_PATH=/var/www", "HTTPD_DATA_ORIG_PATH=/var/www", "HTTPD_LOG_PATH=/var/log/httpd" ], "Entrypoint": [ "container-entrypoint" ], "Cmd": [ "/usr/bin/run-httpd" ], "WorkingDir": "/opt/app-root/src", ...output omitted...Pull a container image from the registry using the
podman pullcommand.[student@servera ~]$podman pull registry.lab.example.com/rhel8/httpd-24Trying 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 7e93f25a946892c9c175b74a0915c96469e3b4845a6da9f214fd3ec19c3d7070Use the
podman imagescommand to view locally stored images.[student@servera ~]$podman imagesREPOSITORY TAG IMAGE ID CREATED SIZE registry.lab.example.com/rhel8/httpd-24 latest 7e93f25a9468 4 weeks ago 430 MBUse the
podman inspectcommand to view information about a locally stored image.[student@servera ~]$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 rmicommand.[student@servera ~]$podman rmi registry.lab.example.com/rhel8/httpd-24Untagged: registry.lab.example.com/rhel8/httpd-24:latest Deleted: 7e93...7070Run the
podman imagescommand to verify that the locally stored image is removed.[student@servera ~]$podman imagesREPOSITORY TAG IMAGE ID CREATED SIZEExit from
servera.[student@servera ~]$exitlogout Connection to servera closed. [student@workstation ~]$
This concludes the guided exercise.
Is It possible to reset root password when the system is on multi-user.target?
jennifer1987
27 lip 2023
Hi thereWell, i have a question, Is It possible to reset root password when the system is on multi-user.target? I was not be able to found a foro o some information related with this and another question that I have, If the grub menu dont show up, is it posible to reset the root password?
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Red Hat System Administration II (RH134)
Haley_Ruccio
21 lip 2023
Build the skills to perform the key tasks needed to become a full-time Linux administratorRed Hat System Administration II (RH134) is the second part of the RHCSA training track for IT professionals who have already attended Red Hat System Administration I. The course goes deeper into core Linux system administration skills in storage configuration and management, installation and deployment of Red Hat Enterprise Linux, management of security features such as SELinux, control of recurring system tasks, management of the boot process and troubleshooting, basic system tuning, and command-line automation and productivity. This course assumes that students have attended Red Hat System Administration I (RH124).Experienced Linux administrators who seek rapid preparation for the RHCSA certification should instead start with RHCSA Rapid Track (RH199).This course is based on Red Hat Enterprise Linux 9.0.Course summaryInstall Red Hat Enterprise Linux using scalable methodsAccess security files, file systems, and networksExecute shell scripting and automation techniquesManage storage devices, logical volumes, and file systemsManage security and system accessControl the boot process and system servicesRun containersAudience for this courseThis course is geared toward Windows system administrators, network administrators, and other system administrators who are interested in supplementing current skills or backstopping other team members, in addition to Linux system administrators who are responsible for these tasks:Configuring, installing, upgrading, and maintaining Linux systems using established standards and proceduresProviding operational supportManaging systems for monitoring system performance and availabilityWriting and deploying scripts for task automation and system administrationRecommended trainingSuccessful completion of Red Hat System Administration I (RH124) is recommended.Experienced Linux administrators seeking to accelerate their path toward becoming a Red Hat Certified System Administrator should start with the RHCSA Rapid Track course (RH199).Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technology requirements.This course is not designed for bring your own device (BYOD).Internet access is not required, but is recommended to allow students to research and access Red Hat online resources.
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Welcome to the Red Hat System Administration II (RH134) group in the Red Hat Learning Community!
Deanna
18 lip 2023
We are excited to launch a space dedicated to the Red Hat Training course Red Hat System Administration II! To gain the most value from this group - click the "Join Group" button in the upper right hand corner.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH134.Read more about Red Hat System Administration II here.
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