Tag: linux

TLS1.3 on older linux distro

TLS1.3 is not commonly supported on older distro due to slow adaptation of new version of openssl. To get around that, we can compile libressl from source. Here is how I did it on AmazonLinux2.

Automatically update EL8

In EL7, we can use yum-cron to automatically install updates. On EL8, the equivalent tool is dnf-automatic. Here is how to set it up.

Run RHEL8 on docker with Red Hat UBI image

Red Hat is offering a few official docker images for RHEL8. One can now use or build images based on the latest operating system from Red Hat. Here is how to do it in 3 simple steps

RHEL8 and Ansible

Red Hat EL8 is available now since May 7th. It’s not particularly exciting IMO. Many “new” features have been available on other distros quite a while ago. Here, I want to evaluate how easy it is to adopt my existing ansible playbooks on this new version of Red Hat.

UID > INT_MAX

From thehackernews, it was said when the UID is larger than INT_MAX, which is 2147483647, privilege validation is improperly handled and that gives the user right to run systemctl commands as if he/she is a privileged user. What is my INT_MAX? Though it’s hard to imagine who would use such an UID when they usually starts…

Cool feature on Azure – Run Command Script

I don’t think I’ve ever said anything good about Azure, but I’ve finally ran into one today. Someone screwed up sshd_config and the service would not start anymore. With the run script tool, I was able to revert the config to the original version and restart the service. Fortunately, the changes were checked into RCS,…

Building my first Linux package

Let’s take a look at how to build a really simple Linux package. The most common package formats are definitely .deb and .rpm. One will find them on Debian-variants and Redhat-variants respectively. In the following examples, a package will be created and it will contain 1 script.The script depends on Python so I want the…

Redshift for Linux desktop

Ever since Mac deploys the night shift feature, I could not stop using it. For someone who needs to look at monitors for long hours, I absolutely love it. I can also do it with Linux.

GNU moreutils

Moreutils comes with additional Unix utilities. Sysadmin loves tools. Let’s see what tools are available.