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Operating Systems Linux Red Hat MySQL (mysqld) fails to start!
# 1  
Old 09-27-2011
MySQL (mysqld) fails to start!
Hello,

I have recently installed MySql and I encourage an error.
I am using Fedora 15 and when I am trying to start mysqld service i am getting
the following error message:
Code:
Starting mysqld (via systemctl):  Job failed. See system logs and 'systemctl status' for details. [FAILED]

If I try to start it from Service Configuration GUI it fails too.

Checking the system logs it just says:
Code:
Sep 27 11:49:11 mp054a systemd[1]: mysqld.service: control process exited, code=exited status=1
Sep 27 11:49:11 mp054a systemd[1]: Unit mysqld.service entered failed state.

If I try to type 'msql' from command line I am getting the following error
msg:
Code:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

I have read about the /etc/my.cnf file and I tried to edit it somehow
but with no success.
My /etc/my.cnf contains the following:
Code:
[mysqld]
#datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
max_connections=125
table_cache=2500
thread_cache_size=100
thread_stack=250K
wait_timeout=10
join_buffer=5M
myisam_sort_buffer_size=15M
query_cache_size=15M
read_rnd_buffer_size=5M
default-character-set=utf8
default-collation=utf8_unicode_ci
character-set-server=utf8
collation-server=utf8_unicode_ci 

[mysql.server]
user=mysql
#basedir=/var/lib
old-passwords = 1

[client]
default-character-set=utf8

[mysqld_safe]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

Note that I have commented datadir and basedir. That's because I had the same mysqld problem yesterday and I found online that if I comment them it might work.And indeed the problem solved.
But later I tried to install moodle and I had to make some changes to the permission of some folders over /var/ directory. I had to play a little bit and in the end I manage to figure permissions in such a way that moodle was working. (Note that permission changes have been made after I managed to start mysqld successfully).

Today when I power my computer on and tried to restart httpd and mysqld, the latter one failed.

If I uncomment datadir and basedir mysqld still fails to start.

If I do 'ls -la /var/lib' I am getting the following about mysql:
Code:
drwxr-xr-x.  5 mysql mysql 4096 Sep 27 11:49 mysql

If I do 'ls -la /var/lib/mysql' I am getting the contents of mysql:
Code:
drwxr-xr-x.  5 mysql mysql     4096 Sep 27 11:49 .
drwxr-xr-x. 41 root  root      4096 Sep 26 22:04 ..
-rwxr-xr-x.  1 mysql mysql 35651584 Sep 27 11:49 ibdata1
-rwxr-xr-x.  1 mysql mysql  5242880 Sep 27 11:49 ib_logfile0
-rwxr-xr-x.  1 mysql mysql  5242880 Sep 27 11:49 ib_logfile1
drwxr-xr-x.  2 mysql mysql    20480 Sep 26 17:07 moodle
-rwxr-xr-x.  1 mysql mysql    35556 Sep 27 11:49 mp054a.halls.manchester.ac.uk.err
drwxr-xr-x.  2 mysql mysql     4096 Sep 26 02:29 mysql
drwxr-xr-x.  2 mysql mysql     4096 Sep 26 02:29 performance_schema

I have noticed that if I do 'ls -la /tmp/' I can see the following about mysql.sock:
Code:
lrwxrwxrwx.  1 mysql   mysql        25 Sep 26 03:13 mysql.sock -> /var/lib/mysql/mysql.sock

whereas I cannot find anything about mysql.sock on /var/lib/mysql

I tried to change socket to 'socket=/tmp/mysql.sock' in the my.cnf and
nothing changes.

I am not an expert user on linux. I hope the details I added above can
help you help me Smilie

I would appreciate any help. Thanks in advace!
Last edited by Scott; 09-27-2011 at 11:17 AM.. Reason: Replace Quote tags with Code tags
# 2  
Old 09-27-2011
Please post the content of the error log file (/var/lib/mp054a.halls.manchester.ac.uk.err or /var/log/mysqld.log, choose the most recent).
# 3  
Old 09-27-2011
Hello radoulov,

Thank you for your answer. It seems that we have found something here.

This is the log of the last attempt to start mysqld service from
Code:
/var/lib/mysql/mp054a.halls.manchester.ac.uk.err

Code:
110927 15:04:00 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
110927 15:04:47 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110927 15:04:47 [Note] Plugin 'FEDERATED' is disabled.
110927 15:04:47 InnoDB: The InnoDB memory heap is disabled
110927 15:04:47 InnoDB: Mutexes and rw_locks use GCC atomic builtins
110927 15:04:47 InnoDB: Compressed tables use zlib 1.2.5
110927 15:04:47 InnoDB: Using Linux native AIO
110927 15:04:47 InnoDB: Initializing buffer pool, size = 128.0M
110927 15:04:47 InnoDB: Completed initialization of buffer pool
110927 15:04:47 InnoDB: highest supported file format is Barracuda.
110927 15:04:47  InnoDB: Waiting for the background threads to start
110927 15:04:48 InnoDB: 1.1.8 started; log sequence number 6768017
110927 15:04:48 [ERROR] /usr/libexec/mysqld: unknown variable 'default-character-set=utf8'
110927 15:04:48 [ERROR] Aborting

110927 15:04:48  InnoDB: Starting shutdown...
110927 15:04:49  InnoDB: Shutdown completed; log sequence number 6768017
110927 15:04:49 [Note] /usr/libexec/mysqld: Shutdown complete

110927 15:04:49 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

According to this the error is: unknown variable 'default-character-set=utf8'
If I comment that line from /etc/my.cnf file (on [mysqld]) then the log gives an unknown variable error again, but this time for default-collation=utf8_unicode_ci. If I comment both lines:
Code:
#default-character-set=utf8
#default-collation=utf8_unicode_ci

then mysqld starts successfully.

The thing is that moodle requires this two lines and I cannot comment them.

Any ideas of why I am getting the unknown variable problem ?
Last edited by Scott; 09-27-2011 at 11:19 AM.. Reason: Replace Quote tags with Code tags
# 4  
Old 09-27-2011
If I recall correctly, those variable names are deprecated, the new names should be something like this:

Code:
character-set-server
collation-server

Check the documentation (the link is for 5.5, check the manual for your specific version).
# 5  
Old 09-27-2011
The strange think is that when I was installing moodle I had to change the character set of mysql and according to a moodle documentation I had to add those lines in my.cnf:

Quote:
default-character-set=utf8
default-collation=utf8_unicode_ci
character-set-server=utf8
collation-server=utf8_unicode_ci
So according to you now I should delete the first two and leave only the latter two.
Things look to work fine now. I hope I will not have any further problems which I cannot see now.

Thank you very much for helping me
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