MySQL Daemon Failed to Start - centos 6

Question

EDIT  Look at the checkmarked answer comments to get your issue solved    Whenever I try to start the SQLD service I get MySQL Daemon Failed to Start  I infact tried to  start  the service by doing the following   service mysqld start   Also   When I type  mysql  I get   ERROR 2002  HY000   Can t connect to local MySQL server through socket   var lib mysql mysql sock   2    I know that there should be a mysql sock file in that directory  so I create one  But the file just auto removes its self and I continue to get the error 2002   I am also unable to log into PHPMyAdmin due to the error  I can access phpmyadmin page but when logging in I get   2002 Cannot log in to the MySQL server  EDIT   Here is my mysql log file   131201 13 05 07 mysqld safe mysqld from pid file  var run mysqld mysqld pid ended 131201 13 18 18 mysqld safe Starting mysqld daemon with databases from  var lib mysql 131201 13 18 18  Note  Plugin  FEDERATED  is disabled   usr libexec mysqld  Can t find file     mysql plugin frm   errno  13  131201 13 18 18  ERROR  Can t open the mysql plugin table  Please run mysql upgrade to create it  131201 13 18 18 InnoDB  The InnoDB memory heap is disabled 131201 13 18 18 InnoDB  Mutexes and rw locks use GCC atomic builtins 131201 13 18 18 InnoDB  Compressed tables use zlib 1 2 3 131201 13 18 18 InnoDB  Using Linux native AIO 131201 13 18 18 InnoDB  Initializing buffer pool  size   128 0M 131201 13 18 18 InnoDB  Completed initialization of buffer pool 131201 13 18 18  InnoDB  Operating system error number 13 in a file operation  InnoDB  The error means mysqld does not have the access rights to InnoDB  the directory  InnoDB  File name   ibdata1 InnoDB  File operation call   open   InnoDB  Cannot continue operation  131201 13 18 18 mysqld safe mysqld from pid file  var run mysqld mysqld pid ended   I ran mysql upgrade and got   Looking for  mysql  as  mysql Looking for  mysqlcheck  as  mysqlcheck FATAL ERROR  Upgrade failed

User · Answer

RE  MySQL Daemon Failed to Start - centos 6   RHEL 6   Yum Install MySQL  etc init d mysqld start MySQL Daemon failed to start  Starting mysqld                                             FAILED  Review The log   var log mysqld log You might get this error    ERROR  Can t open the mysql plugin table  Please run mysql upgrade to create it    Solution that works for me is running this       mysql install db   Please let me know if this won t solve your issue

User · Answer

etc init d mysqld stop   mysqld safe --skip-grant-tables  amp  mysql upgrade    etc init d mysqld stop    etc init d mysqld start

User · Answer

run this    chown -R mysql mysql  var lib mysql   and try again

User · Answer

I had the same issue happening  When I checked the error log I found that my disk was full    Use   df -h    on the command line  it will tell you how much space you have left  mine was full  found my error log file was 4 77GB  I downloaded it and then deleted it   Then I used service mysqld start and it worked

User · Answer

Yet another tip that worked for me  Run the command     mysql install db

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Reference here 2 10 2 1 Troubleshooting Problems Starting the MySQL Server   1 Find the data directory  it was configured in my cnf     mysqld  datadir  var lib mysql   2  Check the err file it log the error message about why mysql server start failed  the name of err file is related with your hostname   cd  var lib mysql ll tail  hostname  err   3 If you find some messages like    InnoDB  Error  log file   ib logfile0 is of different size 0 33554432 bytes InnoDB  than specified in the  cnf file 0 5242880 bytes  170513 14 25 22  ERROR  Plugin  InnoDB  init function returned error  170513 14 25 22  ERROR  Plugin  InnoDB  registration as a STORAGE ENGINE failed  170513 14 25 22  ERROR  Unknown unsupported storage engine  InnoDB 170513 14 25 22  ERROR  Aborting   then      delete ib logfile0 and ib logfile1     then     etc init d mysqld start

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It may be a permission issue   Please try the following command  etc init d mysqld start as root user

User · Answer

The most likely cause for this error is that your mysql server is not running   When you type in mysql you are executing mysql client    Try      sudo service mysql start   mysql   Update  after OP included log in the question  taken from the comments below        Thanks  saw your log  The log is saying the mysql user doesn t have   proper access rights  I m assuming your mysql user is mysql this can   be verified in  etc my cnf  execute        chown -R mysql mysql  var lib mysql         and try starting mysqld again

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Your database was shut down because of insufficient memory  You can edit the  file my cnf base below graph to resolve it  performance schema max table instances 200 table definition cache 200 table open cache 128

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For those who will be here in the future  if all above methods are not working  check the my cnf file by     sudo gedit  etc my cnf   Find the line start with   bind-address  an-IP-address    Check if the IP address after the equal sign is correct  If you don t even know what the IP is  just use localhost  then you can only connect to MySQL inside the same host   If you want to connect to MySQL remotely  you should actually comment out that line entirely  then it will listen on all IPs and ports which you need because you will be connecting remotely to it over public IPv4   After that add a user to access your database such as   mysql gt  GRANT ALL ON database name   TO user xx xxx xx xx IDENTIFIED BY  your password     Replace xx xx xx xx with your local IP address of your laptop desktop or if it is dynamic you can add them either by   192 168 0    as a dynamic C-class or     if you want to be able to connect from anywhere  this is less secure   Also  if there s a firewall installed  one should open the port on the firewall   For example in Ubuntu   sudo ufw allow 3306 tcp sudo service ufw restart   Now  check if the service is startable by      sudo service mysqld start

User · Answer

You may need free up some space from root     partition  Stop mysql process by    etc init d mysql stop   Delete an unused database from mySql by command   rm -rf  Database-Directory    Execute it in  var lib mysql  Now if you run df -h  you may confused by still full space  For removing the unused database   s directory to be affected  you need to kill processes are using current directory partition   Stopping mysql safe or mysqld safe and then mysqld   ps -A   Then find mysql s process number  e g  2234   Then execute   kill 2234   Now start again mysql    etc init d mysql start

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If you are using yum in AIM Linux Amazon EC2  For security  make a backup complete of directory  var lib mysql  sudo yum reinstall -y mysql55-server  sudo service mysqld start

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I just had this error  I could not connect remotely to my mysql server  I tried restarting mysql server with service mysqld restart  I used root   It stopped but did not start again  Turns out my memory was full  Cleared out a few GBs and it is working fine

User · Answer

try     netstat -a -t -n   grep 3306    to see any one listening to the 3306 port then kill it  I was having this problem for 2 days  Trying out the solutions posted on forums I accidentally ran into a situation where my log was getting this error       check that you do not already have another mysqld process

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etc init d mysql stop chown -R mysql mysql  var lib mysql mysql install db  etc init d mysql start     All this rescued my MySQL server

User · Answer

Try restarting apache sudo service httpd restart  Worked for me

[php] MySQL Daemon Failed to Start - centos 6

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