MySQL and Wordpress Dockers do not keep running

Posted November 15, 2014 9.9k views

Dear all, I want to get Wordpress running using Docker on CoreOS.
I followed all the instructions for MySQL, I gave the following command:

docker run --name wordpress-mysql -e MYSQL_ROOT_PASSWORD=rtpassword -e MYSQL_USER=fvhemert -e MYSQL_PASSWORD=usrpassword -e MYSQL_DATABASE=wordpress -d mysql

Stangely, the container run for a short while, typing “docker ps” I see it but after some second I “docker ps” again and it is gone, I still see it using “docker ps -a”.

Subsequently I give the command:

docker run --name fvhemert-wordpress --link=wordpress-mysql:mysql -e WORDPRESS_DB_USER=fvhemert -e WORDPRESS_DB_PASSWORD=usrpassword -e WORDPRESS_DB_NAME=wordpress -p 8080:80 -d wordpress

There a no further errors but “docker ps” does not show any running containers, they both are present when typing “docker ps -a” and have that status “excited”.

I don’t want them exited, I though that the “-d” argument would make them runs as daemons and keep them active? There is not active page on the ip.adres:8080 or ip.adres:80.

Any suggestions? What am I doing wrong?

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4 answers

First, check your logs by typing docker logs my-container-name and see what’s going on.

I had a similar problem (MySQL on Ubuntu14.04+Docker), and it turned out it was because I was trying to get MySQL up and running on an instance with only 512MB RAM. Since DO’s images don’t come with a swap file enabled by default, MySQL was filling up the RAM and then – having nowhere to page memory when it fills up – failing.

The two easiest ways to fix this are:

  1. Spin up an instance with at least 1GB of RAM.
  2. Add a swap file to your instance.

Hope this helps.

by Jai Boudreau
This article will cover the pros and cons of using virtual memory or a swap file (paging), determining if your droplet already uses virtual memory or paging, the differences between a swap partition and a swap file, information on how to create a swap file, and how to configure the system's "swappiness" (how likely it is to use virtual memory as well as determining the appropriate size to use).
  • I don’t think that is it. I have more 512 instances with MySQL and several Drupal websites and no problems. But when I spin up the mysql image:

    docker run -t -i mysql:latest /bin/bash

    All mysql commands end in:
    ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ’/tmp/mysql.sock’ (2)

    I guess I’m going to report on the image webite:

  • The MySQL container works fine to me.
    The problem is from the wordpress:latest dockerfile, I cannot start it via “sudo docker run –name xxwordpress –link xx-mysql:mysql -p 3825:80 -d wordpress”, and I cannot see the wordpress docker logs via “docker logs <container id>”.


Your original mysql docker command is as follows:

docker run –name wordpress-mysql -e MYSQLROOTPASSWORD=rtpassword -e MYSQLUSER=fvhemert -e MYSQLPASSWORD=usrpassword -e MYSQL_DATABASE=wordpress -d mysql

“Looking” at this i think you are missing the -p command that specifies a port for mysql operations aka tcp:3306.

There are two ways you can sort this out.

  1. use –expose 3306 when running mysql container.

  2. use -p :3306:3306 when running mysql container. (just make sure you don’t allow wan access on 3306).

Hopefully, this should solve your problem.

Best Regards
Hareem Haque

I’m having the same problems. How did you guys solve this?

If you have $5 512M Droplet, just enable swap.
I stuck with this for a few days until I found this solution.

by Etel Sverdlov
Linux swaps allow a system to harness more memory than was originally physically available. Here's how to set up a linux swap file on Ubuntu 12.04