In this blog, we’ll look at how the hidepid options for /proc and Percona XtraDB Cluster can fight with one another.

One of the things I like about consulting at Percona is the opportunity to be exposed to unusual problems. I recently worked with a customer having issues getting SST to work with Percona XtraDB Cluster. A simple problem you would think. After four hours of debugging, my general feeling was that nothing made sense.

I added a bash trace to the SST script and it claimed MySQL died prematurely:

[ -n '' ]]
+ ps -p 11244
+ wsrep_log_error 'Parent mysqld process (PID:11244) terminated unexpectedly.'
+ wsrep_log '[ERROR] Parent mysqld process (PID:11244) terminated unexpectedly.'
++ date '+%Y-%m-%d %H:%M:%S'
+ local readonly 'tst=2017-11-28 22:02:46'

At the same time, from the MySQL error log MySQL was …