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Check Config Before Restarting SSH Daemon
Super quick advice today, but one of them pearls of experience that now and then saves your day. Learn how to check and confirm your recent changes to SSH daemon config file (/etc/ssh/sshd_config)...
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Black Friday Deals
Unix Tutorial It's Black Friday, meaning there's lots of great deals online – hardware, software and hosting. Here's just a few things I really liked: Online.net (where I rent a few dedicated hosts)...
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How To Troubleshoot SELinux with Audit Logs
Audit Logs with SELinux Messags I'm post configuring a new RHEL 8 setup on my old PC and want to share some useful SELinux troubleshooting techniques. How To Check Audit Logs for SELinux I had a...
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Specify User per Task in Ansible
become_user per task in Ansible Turns out, become_user directive can be used not only for privilege escalation (running Ansible playbooks as root), but also for becoming any other when you want...
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Skip Gathering Facts in Ansible
Red Hat Ansible There are Ansible playbooks which depend on the most up-to-date information found on each node. That's where fact gathering is a much needed help. But there are also simpler more...
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Confirm Firewall Configuration in RHEL 8
List Firewall Rules in RHEL 8 I'm fascinated by the improvements and new features in RHEL 8, plus it's a primary distro used in most corporate environments – so expect to quite a number of posts...
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Upgrading to CentOS 7.7
CentOS CentOS 7.7 has just been released a few days ago and with any luck CentOS 8 will be released next week. I decided to quickly upgrade one of my dedicated servers from CentOS 7.6 to CentOS 7.7....
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Hello, World in podman
RHEL 8 Turns out it's not that easy to install Docker CE in RHEL 8 just yet. Well, maybe there's no immediate need since RHEL 8 comes with its own containerization stack based on podman? Hello, World...
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Attach Interface to Specific Firewall Zone in RHEL 8
RHEL 8 One of the first things I had to do on my recently built RHEL 8 PC was to move the primary network interface from public (default) zone to home zone – to make sure any firewall ports I open...
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CentOS 8 and CentOS Stream Released
Great news, CentOS 8 is released now. Even better – there's now a step in between Fedora and RHEL, called CentOS Stream. Have you tried them yet? I'll be upgrading to CentOS 8 this week and am also...
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Run Ansible Tasks Based on OS Distribution
Skipping Tasks Based on Ansible Conditionals I'm actively refreshing my Ansible setup for both servers and desktops, running mostly Red Hat Enterprise Linux and CentOS Linux. Today's quick tip is...
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Show Process Limits Using /proc Filesystem
Show process limits with /proc filesystem I think I mentioned the special /proc filesystem before, it's available in Linux distros and helps you obtain system and process information via normal files...
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preserve-root flag for rm command
rm will warn you instead of removing everything in / recursively rm command, the one used to delete files and directories, can be very dangerous if used with root privileges. It's comforting to know...
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ZFS on root in Ubuntu 19.10
Ubuntu 19.10 Just read about ZFS making it into Ubuntu 19.10 installer as an experimental feature here, sounds pretty cool! What is ZFS? ZFS (originally called Zettabyte File System) is a...
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Install Software with Homebrew in Ansible
Red Hat Ansible Pretty cool! I started automating my macOS setup and discovered that mighty Ansible ecosystem has even Homebrew automation! Example of Homebrew Cask in Ansible Here's how I can install...
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bat – syntax highlighter
I'm back online! Have been doing a bit of reading but was too busy to publish anything, so this week should be fun with lots of content. bat command bat is a simple tool that lets you show contents of...
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Unix Tutorial Digest – November 5th, 2019
Unix Tutorial Digest: monthly digest of Unix/Linux topics September and October 2019 have been so busy for me at work and at home that I posted less frequently than usual and also skipped the...
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Show Mounted Filesystems of Certain Type
mount -t Pretty cool: I've just learned a very simple but rather useful trick that will certainly help with my basic home automation and shell scripting. mount command has an option to list...
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Automating macOS Screenshots with Hazel
screenshots folder I've used a number of screenshot applications on my computers in the last few years, and it's a never ending search for the perfect balance of flexibility and performance. Today I'm...
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brew cask vs brew formula
Homebrew for MacOS Since reinstalling certain software packages on my Linux desktop, Linux laptop and Macbook a few times in the past months, I'm positively in love with the Homebrew project. Today...
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