After nearly a year of running GlusterFS on my compute cluster, I’m surprised it took me so long to run into this bug. I rebooted one of my compute nodes and found that the machine hung at Mounting network filesystems during the boot sequence. From the volume log — /var/log/glusterfs/<volname>.log — on the client, it […]
You want to use PHPMyAdmin. You want to force HTTPS so you don’t send plain-text MySQL credentials over the wire/air. You start fiddling with mod_rewrite and troubleshooting your Apache’s myriad of virtual hosts and included config files. There’s a better way! In /etc/phpMyAdmin/config.inc.php, add this to the bottom: $cfg[‘ForceSSL’] = true; I like mod_rewrite and […]
Ever since the Sandy Bridge microarchitecture, Intel CPUs have been coming with hardware-accelerated AES support (aka “AES-NI”, new instructions). I figured it would be interesting see a comparison between AES with and without the hardware acceleration on my Intel Core i5-3317U CPU (Ivy Bridge) on Arch Linux. According to a post on the OpenSSL Users […]
The other day a drive died in a hardware RAID5 array on one of my GlusterFS replica servers. I had a spare drive on hand, but I wasn’t sure what the process was for replacing it, and just how much down time my cluster would incur. To my surprise, I took the replica down and […]
Notes from the GlusterFS 3.3.1 -> 3.4.0 upgrade on my storage / compute cluster at ILRI, Kenya. I referenced Vijay Bellur’s blog post about upgrading to 3.4, then added my own bits using Ansible for my infrastructure (I gave an overview of my Ansible setup here). Our cluster is comprised of: Three “storage” nodes (gluster […]