06 February, 2019

Understanding ZFS : Checksum

Ever wondered what kind of checksum ZFS uses to check for bit rot ? Probably not, but it turns out you can change the used algorithm. However like most settings, the defaults are chosen by smart people. So changing it might not be doing you any favors. As it turns out, the default checksum used […]

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19 December, 2018

Install PHP 7 Stats on Centos 7

I installed PHP 7.1 through webtatic, except with Apache instead of Nginx, so not the -fpm.  Installing PHP stats package is easy, if you know how, so follow along. First we need to provide our system with a compiler, and the pear package which contains pecl (yum whatprovides pecl) yum install gcc php71w-pear After that you […]

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05 December, 2018

Change default kernel boot Centos 7

I installed a new kernel (kernel-ml, from mainline 4.18) to make sure on next boot it got selected this is what I had to do : (Since its headless and I won’t see grub when it boots) Install kernel mainline : yum install kernel-ml Find the current installed kernels : cat /boot/grub2/grub.cfg | grep ^menuentry | […]

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03 December, 2018

Apache Failed to create shared memory

Auch, I got the same error as ma.ttias.be pretty much two years ago. I have no idea why it failed, however the solution seemed to work similar to what he suggested. [Mon Dec 03 15:07:55.871866 2018] [auth_digest:notice] [pid 3352] AH01757: generating secret for digest authentication … [Mon Dec 03 15:07:55.871892 2018] [auth_digest:error] [pid 3352] (2)No such […]

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08 November, 2018

Rename a volume group on LVM

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