MySQL Job failed to start

Question

I m on Kubuntu 12 04  and after installing mysql via an apt-get  mysql ver  5 5 35   i m trying to start mysql service  but I got this error      sudo service mysql start      start  Job failed to start   So I googled this problem  it says i have to go to the  var log mysql error log  But my error log file is empty     Then I checked the permissions       drwxr-s---  2 mysql  adm     4096 Apr  7 11 21 mysql      -rw-r----- 1 mysql adm    0 Apr  7 11 21 error log   So I don t know what to do    Why this error   Why is the error file empty

User · Answer

In my case  i do    sudo nano  etc mysql my cnf search for bind names and IPs remove the specific  and let only localhost 127 0 0 1 and the hostname

User · Answer

I had the same problem  But i discover that my hd is full     sudo cat  var log upstart mysql log  proc self fd 9  ERROR  The partition with  var lib mysql is too full    So  I run     df -h   And I got the message   dev xvda1      7 8G  7 4G     0 100      Then I found out which folder was full by running the following command on the terminal    cd  var www   for i in    do echo  i  find  i  wc -l  done   This give me the number of files on each folder on  var www  I logged into the folder with most files  and deleted some backup files  and i continued deleting useless files and cache files   then I run   sudo  etc init d mysql start and it work again

User · Answer

To help others who do not have a full disk to troubleshoot this problem  first inspect your error log  for me the path is given in my  etc mysql my cnf file    tail  var log mysql error log   My problem turned out to be a new IP address allocated after some network router reconfiguration  so I needed to change the bind-address variable

User · Answer

In my case    restart server restart mysql create  socket in directory

User · Answer

My problem was running out of memory  Digital ocean has great instruction for adding swap memory for Ubuntu  https   www digitalocean com community tutorials how-to-add-swap-on-ubuntu-14-04  This solved the issue and enabled me to restart the Mysql that otherwise would not start

User · Answer

Reinstallation will works because it will reset all the value to default  It is better to find what the real culprits  my cnf  editing mistake does happens  e g  bad outdated parameter suggestion during mysql tuning    Here is the mysql diagnosis if you suspect some value is wrong inside my cnf    Run the mysqld to show you the results   sudo -u mysql  mysqld    Afterwards  fix all the my cnf key error that pop out from the screen until mysqld startup successfully    Then restart it using   sudo service mysql restart

User · Answer

The given solution requires enough free HDD  the actual problem was the HDD memory shortage  So If you don t have an alternative server or free disk space  you need some other alternative   I faced this error with my production server  Linode VPS  when I was running a bulk download into MySQL  Its not a proper solution but VERY QUICK FIX  which we often need in production to bring things UP FAST    Resize our VPS Server to higher Hard Disk size Start MySQL  it works  Login to your MySQL instance and make appropriate adjustments that caused this error  e g  remove some records  table  or take DB backup to your local machine that are not required at production  etc  After all you know  what caused this issue   Downgrade your VPS Server to previous package you was already using

User · Answer

In most cases  just purging the mysql-server package and re-installing it will do the job   Run   sudo apt-get purge mysql-server-5 1 mysql-common   followed by   sudo apt-get install mysql-server

User · Answer

In my case  it simply because the disk is full  Just clear some disk space and restart and everything is fine

User · Answer

This line did solve the issue in my case   sudo apt clean

User · Answer

First make a backup of your  var lib mysql  directory just to be safe   sudo mkdir  home  lt your username gt  mysql  cd  var lib mysql  sudo cp    home  lt your username gt  mysql  -R   Next purge MySQL  this will remove php5-mysql and phpmyadmin as well as a number of other libraries so be prepared to re-install some items after this   sudo apt-get purge mysql-server-5 1 mysql-common   Remove the folder  etc mysql  and it s contents  sudo rm  etc mysql  -R   Next check that your old database files are still in  var lib mysql  if they are not then copy them back in to the folder then chown root root   only run these if the files are no longer there   sudo mkdir  var lib mysql  sudo chown root root  var lib mysql  -R cd   mysql  sudo cp    var lib mysql  -R   Next install mysql server  sudo apt-get install mysql-server   Finally re-install any missing packages like phpmyadmin and php5-mysql

User · Answer

In my case the problem was the  var log disk full  check with df -h  Just deleted some log files and mysql started  no big deal

User · Answer

Check the file permissions  if edited  Fail     sudo chmod 776  etc mysql my cnf   sudo service mysql restart mysql stop waiting start  Job failed to start   Ok     sudo chmod 774  etc mysql my cnf   sudo service mysql restart stop  Unknown instance  mysql start running  process 9564

[mysql] MySQL Job failed to start

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