centos Archives - Reflections & Explorations

Hostname Pings Don’t Work Post Eero – How to make ’em work

March 8, 2025May 30, 2020 by Vik

Just got Eero to replace Google Onhub Routers. Quickly found out that Eero lacks a DNS server which means I cannot access any of my home servers using their hostnames. Also, all my home servers were not showing any hostnames in Eero App which was very weird. Ping from my macOS computer wasn’t registering Why do I need hostname access? I’ve management URLs and Shared drives that use hostname. I’m not going to use IP …

SELinux fix to allow Docker containers access to Kernel modules

March 8, 2025February 7, 2018 by Vik

This is most likely after effect of Spectre and Meltdown Kernel patches rolled out for CentOS. My OpenVPN container could not access /dev/net/tun device even though the Run Script had necessary parameters. Fix setsebool -P domain_kernel_load_modules=1

SELinux fix for Mergerfs to allow Docker and Samba access

March 8, 2025February 4, 2018 by Vik

I recently started using Snapraid and Mergerfs setup to manage my disk pool. I have ~27TB of raw storage which I am managing. While setting up Mergerfs as usual ran into SELinux issues that will prohibit Docker and Samba access to the storage. So, here’s my fix. Samba setsebool -P samba_share_fusefs=1 Docker setsebool -P virt_sandbox_use_fusefs=1

Create To addresses for Local Linux Users

March 8, 2025January 26, 2018 by Vik

If you want to set external email address to be used as “To” address for System users then edit the file “/etc/mail.rc” Add entries such as alias root [email protected]

Fixing Random Samba Share Lockouts

March 8, 2025December 27, 2017 by Vik

Ever had Samba shares on CentOS become randomly inaccessible? If so, I might have a cure… Turns out the culprit is (yet) again SELinux. Thank you SELinux for your super sensitive security policies… It turns out that you might have lost extra important SELinux label on the share and sub-folders. Don’t ask me why and how? Perhaps a boot failure or power failure or random act of God?! OK, here’s the solution you are looking …