04 August, 2020

Centos 8 : python-devel

You might find when you receive this error : fatal error: Python.h: No such file or directory The solution on Centos is to install python-devel package; In Centos 8 however this package was renamed due to the fact python 2.7 is no longer the default one, it has become 3. And this package was named […]

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21 April, 2020

Centos messages flooded with Create slice, Removed slice

In Centos 7/8 /var/log/messages is flooded with this : Apr 21 08:40:01 tinky systemd: Created slice User Slice of root. Apr 21 08:40:01 tinky systemd: Started Session 1709 of user root. Apr 21 08:40:01 tinky systemd: Removed slice User Slice of root. Apr 21 08:50:01 tinky systemd: Created slice User Slice of root. Apr 21 […]

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zfs on linux

25 March, 2020

Sharenfs on ZFS and mounting with autofs

ZFS has this less documented feature, called share[nfs|smb]; I tried it once, it “did not work on first attempt”™ So I ignored it; However now we faced an issue where we normally exported ZFS volumes using /etc/exports (NFS); and mounted using /etc/fstab; but got an empty directory where there was a “sub” zpool volume; This […]

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20 February, 2020

Increasing allowed nproc in Centos 7

The nproc are the number of proces units a user can start; This is managed in the file : /etc/security/limits.confbut can be overwritten in /etc/security/limits.d/ normally in /etc/security/limits.d/20-nproc.conf which has priority over the limits.conf file. To check how many nproc’s you are using, you need to include the amount of threads, this can be seen […]

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