问题
I'm setting up a replication server and when I try to start the mysql service for the first time, it fails:
[root@ravioli mysql]# service mysqld start
MySQL Daemon failed to start.
Starting mysqld: [FAILED]
[root@ravioli mysql]# tail /var/log/mysqld.log
151013 13:41:27 [ERROR] Plugin 'InnoDB' init function returned error.
151013 13:41:27 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
/usr/libexec/mysqld: File '/databases/mysql/mysql_slow_queries.log' not found (Errcode: 13)
151013 13:41:27 [ERROR] Could not use /databases/mysql/mysql_slow_queries.log for logging (error 13). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it.
151013 13:41:27 [ERROR] Unknown/unsupported storage engine: InnoDB
151013 13:41:27 [ERROR] Aborting
151013 13:41:27 [Note] /usr/libexec/mysqld: Shutdown complete
151013 13:41:27 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
I confirmed that user mysql sees and is able to write to /databases/mysql/mysql_slow_queries.log.
Then I checked getenforce and see it is set to Enforcing.
How do I configure MySQL to play nicely with SELinux?
回答1:
All I needed was to delete two files which are:
ib_logfile0
and
ib_logfile1
Then going back to start mysql everything worked
回答2:
This resolved my problem
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoremove
sudo rm /var/lib/mysql/ib_logfile0
sudo rm /var/lib/mysql/ib_logfile1
sudo apt-get install mysql-server
回答3:
Ok this was actually much easier than expected.
By default SELinux is Enforcing, which prevents unexpected writes on the filesystem. I just needed to tell SELinux that it's OK for MySQL to write to a non-standard directory. To wit:
[root@ravioli]# semanage fcontext -a -t mysqld_db_t "/databases/mysql(/.*)?"
-bash: semanage: command not found.
Derp. To install semanage, use this:
yum install policycoreutils-python
Now run the command again. This may take a few moments...
[root@ravioli]# semanage fcontext -a -t mysqld_db_t "/databases/mysql(/.*)?"
Check to see that SELinux is configured for this new directory by looking at this config file:
[root@ravioli]# grep -i mysql /etc/selinux/targeted/contexts/files/file_contexts.local
/databases/mysql(/.*)? system_u:object_r:mysqld_db_t:s0
Additional directories can be added, for instance if you have a dedicated tmp directory somewhere.
[root@ravioli]# semanage fcontext -a -t mysqld_db_t "/databases/mysql_tmp(/.*)?"
Check the config again:
[root@ravioli]# grep -i mysql /etc/selinux/targeted/contexts/files/file_contexts.local
/databases/mysql(/.*)? system_u:object_r:mysqld_db_t:s0
/databases/mysql_tmp(/.*)? system_u:object_r:mysqld_db_t:s0
Finally, update the permissions using restorecron
restorecon -R -v /www/databases/mysql/
and in my setup,
restorecon -R -v /www/databases/mysql_tmp/
Now issue:
service mysqld start
Bene.
Starting mysqld: [ OK ]
来源：https://stackoverflow.com/questions/33109315/unknown-unsupported-storage-engine-innodb