SysAdmin

Percona XtraDB Cluster can recover a crashed node and rejoin it to the cluster using an incremental state transfer. This post walks through how GTID-based position recovery works under the hood and what you will see in the error log during the process.

A quick reference for backing up and restoring full ACL permissions across an entire directory tree using getfacl and setfacl.

A quick reference for the process state codes shown in the STAT column of ps aux, including both standard and BSD-specific flags.

A quick reference for understanding the key qualifiers that appear in RAID controller error codes, so you can pinpoint the exact failure condition instead of guessing from a generic error message.

A quick iptables one-liner to reject TCP traffic from a specific source IP with a TCP reset, tagged with a human-readable comment for future reference.

A quick reference for the core RCS (Revision Control System) commands used to initialize, check in, check out, and log file revisions on a Linux system.