Headache: [ERROR] WSREP: failed to open gcomm backend connection: 131: invalid UUID: 00000000 (FATAL) at gcomm/src/pc.cpp:PC():271 Solution: rename /var/lib/mysql/gvwstate.dat to /var/lib/mysql/gvwstate.dat.bak service mysql start https://github.com/codership/galera/issues/354