How to upgrade MySQL on LEMP 14.04 with 512MB / 1CPU

Posted August 9, 2016 2.2k views

Note: Purpose of this question is to be a reference for anyone who has problem for upgrading their MySQL5.5 on LEMP 14.04 with 512MB / 1CPU size.

My droplet is created using LEMP 14.04 (One-click Apps) with 512MB/1CPU size. And this is by default will install Ubuntu 14.04 with Mysql 5.5.

mysql -V
mysql  Ver 14.14 Distrib 5.5.49, for debian-linux-gnu (x86_64) using readline 6.3

When I'am trying to upgrade the MySQL version to 5.6*, following error occur:

start: Job failed to start  
invoke-rc.d: initscript mysql, action "start" failed.  
dpkg: error processing package mysql-server-5.6 (--configure):  
 subprocess installed post-installation script returned error exit status 1  
Setting up libhtml-template-perl (2.95-1) ...  
Setting up mysql-common-5.6 (5.6.16-1~exp1) ...  
Processing triggers for libc-bin (2.19-0ubuntu6) ...  
Processing triggers for ureadahead (0.100.0-16) ...  
Errors were encountered while processing:  
E: Sub-process /usr/bin/dpkg returned an error code (1)

After hours of searching I found that the failure seems to be because of the default MySQL 5.6 configuration where it requires more memory than it can get in the micro instance. See bug report. See solution

So I’ve taken this steps to fix the errors.

  • Step 1-Removing MySQL 5.5 Completely

    sudo service mysql stop  #or mysqld
    sudo killall -9 mysql
    sudo killall -9 mysqld
    sudo apt-get remove --purge mysql-server mysql-client mysql-common
    sudo apt-get autoremove
    sudo apt-get autoclean
    sudo deluser mysql
    sudo rm -rf /var/lib/mysql
    sudo apt-get purge mysql-server-core-5.5
    sudo apt-get purge mysql-client-core-5.5
    sudo rm -rf /var/log/mysql
    sudo rm -rf /etc/mysql
  • Step 2-Create swap file
    Create a 4G swap file:

    sudo fallocate -l 4G /swapfile

    Change its permission to only root could access and change:

    sudo chmod 600 /swapfile

    Make it swap:

    sudo mkswap /swapfile


    sudo swapon /swapfile
  • Step 3-Install new version of Mysql

    sudo apt-get install mysql-client-5.6 mysql-client-core-5.6
    sudo apt-get install mysql-server-5.6

That’s it! now lets check if the new version is installed

mysql -V
mysql  Ver 14.14 Distrib 5.6.31, for debian-linux-gnu (x86_64) using  EditLine wrapper

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1 answer

Thanks for sharing this!