OpenShift's oc debug and parallel execution

A colleague reported some issues in the OpenShift troubleshooting and diagnosis scripts at OpenShift-checks. Some time ago I did contribute some changes to use functions and allow using the RISU wrapper to the scripts, helping consuming the results via RISU’s HTML interface. As my colleague reported, for some plugins, the output of the command was not shown in the HTML Interface. After some investigation, it was found that parallel execution for the plugins was causing no output to be shown, but when filtering to individual ones via risu -i XXXXXXX/plugin -l it was working fine… the problem was not the check itself, as both of them worked fine when executed individually but failed when executing them together....

November 3, 2022 · 2 min · Pablo Iranzo Gómez

[Book] Red Hat Enterprise Linux 9 Administration

Last year, together with my colleagues Miguel and Scott, we released with the help of Packt team the RHEL8 Administration. During this one, with the collaboration of Pedro, a long-time colleague from the University LUG, we worked on the updated Red Hat Enterprise Linux 9 Administration book that it’s now available for preorder on Amazon. As with the previous version, the book targets users willing to learn skills to administer Red Hat Enterprise Linux or compatible systems....

October 12, 2022 · 1 min · iranzo

Ansible - dynamically include Jinja templates and tasks

For my ansible playbooks, I wanted to be able to add several new templates to be copied to target system, and additionally be able to perform some commands for them without having to specify each individual file/template to copy. My approach: Define for the hosts I want to find templates/playbooks define a var named extras for the relevant hosts: extras: - ntp - certificates The names defined (in above example ntp and certificates) are just name of folders laying inside tasks/templates/${folder} that are searched and included or excluded based on extras values....

September 24, 2022 · 2 min · Pablo Iranzo Gómez

Setup a Quay mirror for offline installations with mirror-registry

In order to setup disconnected registry for installation, follow this blog post by Daniel at Introducing Mirror Registry for Red Hat OpenShift. At the end of the process it will output something like: INFO[2022-08-19 07:10:22] Quay installed successfully, permanent data is stored in /etc/quay-install INFO[2022-08-19 07:10:22] Quay is available at https://${HOSTNAME}:8443 with credentials (init, ${PASSWORDSTRING}) Once the setup is done, remember several steps: Edit /etc/containers/registries.conf to add relevant entries for our registry as required:...

August 19, 2022 · 2 min · Pablo Iranzo Gómez

RHCE and RHCSA tips and tricks

I did the RHCE exam some time ago, and still there are some tricks and advices I tell the people to bear in mind some of the things I used and that were also provided in the Red Hat Enterprise 8 Administration book: Don’t remember every step, it’s not effective, for example as I don’t recall syntax for BIND, I do remember package that has some files with examples and I use that one to check what I need to do Install mlocate and run updatedb as soon as you start, then you can use locate <file> to find out files in your system Use your preferred editor… it’s common to use vi or vim as it’s pretty standard, but if you’re used to another, make yourself comfortable in the system....

July 13, 2022 · 2 min · Pablo Iranzo Gómez
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