RHEL

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....

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....

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....

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....

As said in the article about mixnodes and validators, NYM is a technology aiming for providing privacy for the communications. Once you get some tokens, PUNK at this time, you can use the web wallet to check the balance of your account and delegate it to mixnodes or gateways… but, using the binaries, you can additionally delegate to validators. For doing this, we first need the nymd binary on our system to follow the procedure for compiling it from the documentation for validators, but skip the remaining parts https://nymtech....