# problem starting persona xtradb 5.6 or 5.5 on centos7 **URL:** \ **Category:** Percona XtraDB Cluster 5.x\ **Created:** [October 8, 2014, 5:19pm UTC](https://forums.percona.com/t/problem-starting-persona-xtradb-5-6-or-5-5-on-centos7/3808 "2014-10-08T17:19:45Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![zozo6015](https://avatars.discourse-cdn.com/v4/letter/z/57b2e6/32.png) [@zozo6015](https://forums.percona.com/u/zozo6015)\ **Post date:** [October 8, 2014, 5:19pm UTC](https://forums.percona.com/t/problem-starting-persona-xtradb-5-6-or-5-5-on-centos7/3808/1 "2014-10-08T17:19:45Z")
Hello, I have a cento7 and I want to set up a master-master replication on a 3 node servers. I have configured the my.cnf for two nodes at the beginning to test the configuration and when I run systemctl start mysql or systemctl start [mysql@bootstrap.servic](mailto:mysql@bootstrap.servic)e (for bootstrapping) it only hangs without giving back the prompt or even without writing anything in the log files. My configuration looks like this: ```auto [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] [COLOR=#F5F5F5] ``` Please help me fix this issue. thanks in advance ---
**Author:** ![przemek](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/przemek/32/3_2.png) [@przemek](https://forums.percona.com/u/przemek)\ **Post date:** [October 10, 2014, 2:50am UTC](https://forums.percona.com/t/problem-starting-persona-xtradb-5-6-or-5-5-on-centos7/3808/2 "2014-10-10T02:50:45Z")
Hi, So the /var/log/mysql/error.log is empty? Is /var/log/mysql directory present and owned by mysql? Did you check for mysqld process (ps -ef) after trying to bootstrap? ---
**Author:** ![tkauppin](https://avatars.discourse-cdn.com/v4/letter/t/a9adbd/32.png) [@tkauppin](https://forums.percona.com/u/tkauppin)\ **Post date:** [October 13, 2014, 6:12am UTC](https://forums.percona.com/t/problem-starting-persona-xtradb-5-6-or-5-5-on-centos7/3808/3 "2014-10-13T06:12:16Z")
when you start the first node, set ```auto wsrep_cluster_address = gcomm:// ``` then start the second node with ```auto wsrep_cluster_address = gcomm://10.160.125.20,10.20.123.27 ``` ---
**Author:** ![przemek](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/przemek/32/3_2.png) [@przemek](https://forums.percona.com/u/przemek)\ **Post date:** [October 29, 2014, 4:07am UTC](https://forums.percona.com/t/problem-starting-persona-xtradb-5-6-or-5-5-on-centos7/3808/4 "2014-10-29T04:07:37Z")
tkauppin, systemctl start [mysql@bootstrap.servic](mailto:mysql@bootstrap.servic)e should do that without the need to touch my.cnf. zozo6015, what package versions did you use?