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

Unsupported upgrade for RHEL-based distributions without reinstallation

Most systems, based on RHEL, were not able to upgrade without reinstallation, or best said, not supported. The new version, that was released at around 18 months later contained so many changes that it was hard to test the upgrades themselves until leapp was introduced. Check the lifecycle here: https://access.redhat.com/support/policy/updates/errata However, the biggest problem could be the incompatibility of packages or package formats… but as usually there were some middle layers it was possible to upgrade without reinstallation by performing some manual steps....

April 23, 2022 · 15 min · Pablo Iranzo Gómez

Logitech R400 remote presentation controller on Linux

Since long ago I had it in my mind getting one remote presenter, but most presenters just had two buttons, and the ones that looked to be valid for my use case, required four and seems that only Rii had similar devices, but I didn’t went for it as it was not a huge need, so I ended up with a mini keyboard I had for Raspberry Pi and some debugging in case I had that need....

April 1, 2022 · 3 min · Pablo Iranzo Gómez

Ansible setup for VPN using WireGuard

Setting up WireGuard is not a difficult process but I wanted to automate it among hosts by using a simple playbook that can be executed against the hosts and get it configured and deployed in a simple way. I also wanted to require the minimum possible number of values in the inventory, so tried to automate lot of the information required, leaving in the end only some required values: wireguard: True wgrole: 'master' or 'something else' wgport: port number to use The first step was to create the private and public key once the wireguard package is installed....

March 17, 2022 · 4 min · Pablo Iranzo Gómez

LDAP query from Python

Recently, some colleagues commented about validating if users in a Telegram group were or not employees anymore, so that the process could be automated without having to chase down the users that left the company. One of the fields that can be configured by each user, is the link to other platforms (Github, LinkedIn, Twitter, Telegram, etc), so querying an LDAP server could suffice to get the list of users....

October 19, 2021 · 2 min · Pablo Iranzo Gómez
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