PostgreSQL locks on an nginx server of mine were through the roof and load had reached 55.0, yet the host only had eight CPUs. Was there some problem, or had a link to our website landed on the front page of the New York Times? A quick look at nginx’s access.log showed a very high […]
snap-sync is a utility that facilitates synchronizing snapshots from a local Btrfs file system to another one (either physically connected to the same machine or on another machine via SSH). Internally it uses snapper to create a local snapshot that functions as a base for incremental Btrfs send/receive to the other volume. Once your first […]
After wasting several hours over each of the last several days troubleshooting this seemingly obscure TLS encryption issue in SSSD I feel compelled to write down some notes. It all started with a switch upgrade in our rack. Two new servers I had just provisioned were failing to find users in our 389 directory server. […]
Selenized is a color scheme developed by Jan Warchoł for terminals, text editors, and other text-based environments that improves on the much earlier Solarized scheme.
During an infrastructure upgrade earlier this year I discovered that the in-place upgrade path between CentOS 6 and CentOS 7 is nonexistent — or at least not advised. Suddenly I found myself stuck with the unexpected task of re-provisioning a cluster of GlusterFS storage servers from scratch. To my relief the process was straightforward and, due to […]