# New to Percona - need help starting server **URL:** \ **Category:** Other MySQL® Questions\ **Created:** [June 24, 2014, 1:40pm UTC](https://forums.percona.com/t/new-to-percona-need-help-starting-server/3568 "2014-06-24T13:40:59Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![data123](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@data123](https://forums.percona.com/u/data123)\ **Post date:** [June 24, 2014, 1:40pm UTC](https://forums.percona.com/t/new-to-percona-need-help-starting-server/3568/1 "2014-06-24T13:40:59Z")
I’m running CentOS 6.5 with Percona 5.5 on a server that used to have Server version: 5.6.17 MySQL Community Server (GPL). MySQL was removed and Percona installed. MySQL won’t start. I’ve researched the errors and none of the suggestions helped. [root@servername init.d]# ./mysql status ERROR! MySQL (Percona Server) is not running, but lock file (/var/lock/subsys/mysql) exists [root@servername init.d]# ./mysql start Starting MySQL (Percona Server)… ERROR! The server quit without updating PID file (/var/lib/mysql/servername.pid). /var/lib/MySQL/servername.err contains: 140624 15:07:58 mysqld\_safe Starting mysqld daemon with databases from /var/lib/mysql 140624 15:07:58 [Note] Plugin ‘FEDERATED’ is disabled. 140624 15:07:58 InnoDB: The InnoDB memory heap is disabled 140624 15:07:58 InnoDB: Mutexes and rw\_locks use GCC atomic builtins 140624 15:07:58 InnoDB: Compressed tables use zlib 1.2.3 140624 15:07:58 InnoDB: Using Linux native AIO 140624 15:07:58 InnoDB: Initializing buffer pool, size = 128.0M 140624 15:07:58 InnoDB: Completed initialization of buffer pool 140624 15:07:58 InnoDB: highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 50535 140624 15:07:58 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files… InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer… InnoDB: Doing recovery: scanned up to log sequence number 1597945 140624 15:07:58 InnoDB: Starting an apply batch of log records to the database… InnoDB: Progress in percents: 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 InnoDB: Apply batch completed 140624 15:07:59 InnoDB: Waiting for the background threads to start 140624 15:08:00 Percona XtraDB ([http://www.percona.com](http://www.percona.com)) 5.5.37-35.1-35.1 started; log sequence number 1597945 140624 15:08:00 [ERROR] /usr/sbin/mysqld: Can’t find file: ‘./mysql/host.frm’ (errno: 13) 140624 15:08:00 [ERROR] Fatal error: Can’t open and lock privilege tables: Can’t find file: ‘./mysql/host.frm’ (errno: 13) 140624 15:08:00 mysqld\_safe mysqld from pid file /var/lib/mysql/servername.pid ended Need help to get this server started. Thanks in advance. ---
**Author:** ![miguelangelnieto](https://avatars.discourse-cdn.com/v4/letter/m/b9e5f3/32.png) [@miguelangelnieto](https://forums.percona.com/u/miguelangelnieto)\ **Post date:** [June 26, 2014, 2:50pm UTC](https://forums.percona.com/t/new-to-percona-need-help-starting-server/3568/2 "2014-06-26T14:50:59Z")
140624 15:08:00 [ERROR] /usr/sbin/mysqld: Can’t find file: ‘./mysql/host.frm’ (errno: 13) 140624 15:08:00 [ERROR] Fatal error: Can’t open and lock privilege tables: Can’t find file: ‘./mysql/host.frm’ (errno: 13) Error 13 means “Permission denied” Check if those two files exist and if they are owned by mysql user and group. If you moved from 5.6 to 5.5, then that’s a downgrade. Check this link please: [url][http://dev.mysql.com/doc/refman/5.6/en/downgrading-to-previous-series.html[/url]](http://dev.mysql.com/doc/refman/5.6/en/downgrading-to-previous-series.html%5B/url%5D)