# Unable to start mysql service.
**URL:** https://forums.percona.com/t/unable-to-start-mysql-service/4414
**Category:** Percona XtraDB Cluster 5.x
**Created:** [September 23, 2015, 9:29pm UTC](https://forums.percona.com/t/unable-to-start-mysql-service/4414 "2015-09-23T21:29:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@anirudha](https://forums.percona.com/u/anirudha)
#### Post date: [September 23, 2015, 9:29pm UTC](https://forums.percona.com/t/unable-to-start-mysql-service/4414/1 "2015-09-23T21:29:07Z")
I have followed all the steps from “[Percona Documentation](https://www.percona.com/doc/percona-xtradb-cluster/5.6/installation.html#installation)” to install Percona XtraDB on my CentOS6.5 x64bit host. But when tried to start the mysql service it failed with below error,
==== [INDENT][root@localhost ~]# service mysql status
Redirecting to /bin/systemctl status mysql.service
mysql.service - Percona XtraDB Cluster
Loaded: loaded (/usr/lib/systemd/system/mysql.service; disabled)
Active: failed (Result: exit-code) since Wed 2015-09-23 22:44:44 EDT; 6min ago
Process: 3379 ExecStopPost=/usr/bin/mysql-systemd stop-post (code=exited, status=0/SUCCESS)
Process: 3352 ExecStop=/usr/bin/mysql-systemd stop (code=exited, status=2)
Process: 2894 ExecStartPost=/usr/bin/mysql-systemd start-post $MAINPID (code=exited, status=1/FAILURE)
Process: 2893 ExecStart=/usr/bin/mysqld\_safe --basedir=/usr (code=exited, status=0/SUCCESS)
Process: 2849 ExecStartPre=/usr/bin/mysql-systemd start-pre (code=exited, status=0/SUCCESS)
Main PID: 2893 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/mysql.service
Sep 23 22:44:44 localhost.localdomain mysql-systemd[2894]: /usr/bin/mysql-systemd: line 134: kill: (2893) - No such process
Sep 23 22:44:44 localhost.localdomain mysql-systemd[2894]: ERROR! mysqld\_safe with PID 2893 has already exited: FAILURE
Sep 23 22:44:44 localhost.localdomain systemd[1]: mysql.service: control process exited, code=exited status=1
Sep 23 22:44:44 localhost.localdomain mysql-systemd[3352]: WARNING: mysql pid file /run/mysqld/mysql.pid empty or not readable
Sep 23 22:44:44 localhost.localdomain mysql-systemd[3352]: ERROR! mysql already dead
Sep 23 22:44:44 localhost.localdomain systemd[1]: mysql.service: control process exited, code=exited status=2
Sep 23 22:44:44 localhost.localdomain mysql-systemd[3379]: WARNING: mysql pid file /run/mysqld/mysql.pid empty or not readable
Sep 23 22:44:44 localhost.localdomain mysql-systemd[3379]: WARNING: mysql may be already dead
Sep 23 22:44:44 localhost.localdomain systemd[1]: Failed to start Percona XtraDB Cluster.
Sep 23 22:44:44 localhost.localdomain systemd[1]: Unit mysql.service entered failed state.
[root@localhost ~]#[/INDENT] ====
Here is my my.cnf file,
==== [INDENT][root@localhost ~]# cat /etc/my.cnf
# Template my.cnf for PXC
# Edit to your requirements.
[mysqld]
log\_bin
binlog\_format = ROW
innodb\_buffer\_pool\_size = 100M
innodb\_flush\_log\_at\_trx\_commit = 0
innodb\_flush\_method = O\_DIRECT
innodb\_log\_files\_in\_group = 2
innodb\_log\_file\_size = 20M
innodb\_file\_per\_table = 1
default\_storage\_engine = InnoDB
datadir = /var/lib/mysql
wsrep\_cluster\_address = gcomm://10.1.135.27
wsrep\_provider = /usr/lib64/galera3/libgalera\_smm.so
wsrep\_slave\_threads = 8
wsrep\_cluster\_name = Cluster
wsrep\_node\_name = Node1
wsrep\_node\_address = 10.1.135.27
wsrep\_sst\_method = rsync
wsrep\_sst\_auth = “sstuser:s3cret”
innodb\_locks\_unsafe\_for\_binlog = 1
innodb\_autoinc\_lock\_mode = 2
[mysqld\_safe]
pid-file = /run/mysqld/mysql.pid
syslog
!includedir /etc/my.cnf.d[/INDENT] ====
Any idea how can I debug this?
---
### Author:  [@dendress](https://forums.percona.com/u/dendress)
#### Post date: [September 23, 2015, 10:37pm UTC](https://forums.percona.com/t/unable-to-start-mysql-service/4414/2 "2015-09-23T22:37:27Z")
Check the ownership and permissions of the directory the .pid file is being written.
Also, please sanitize your post. Removing auth info from any posting is a good idea.
---
### Author:  [@rolls](https://forums.percona.com/u/rolls)
#### Post date: [September 25, 2015, 10:09am UTC](https://forums.percona.com/t/unable-to-start-mysql-service/4414/3 "2015-09-25T10:09:02Z")
make chonw -R mysql:mysql on your database directory (/var/lib/mysql)
then start the server with #service mysql bootstrap-pxc