Extending WordPress Dockerfile to use MySQL 5.7 (or 8.0)

Extending WordPress Dockerfile to use MySQL 5.7 (or 8.0)

Oracle’s website shows End of life for MySQL 5.5 as of Jan 20th of 2019, so hurry up and upgrade!

I am working building some demos for Cloud SQL and one of the requirements I had was to run MySQL 5.7 and WordPress as my sample application. The demo consisted on migrating from a single VM environment with WordPress and MySQL running alongside. The narrative: the site got popular and the database became the bottle neck because of all the shared resources between them and the application. The proposed solution? A minimal downtime migration to Cloud SQL, moving the data layer to a dedicated server.

I am going to be doing this demo a lot of times, so I needed some way to automate it. I thought of doing through Docker. I am not Docker proficient, and to begin with I asked Anthony for help to get me to what I wanted, but there are so many nuances! Maybe someone will find a better solution to it than this one, but I decided to share what I got.

Let’s examine the two scenarios I faced. All examples assume Debian/Ubuntu.

I don’t run Docker, just have a VM and want to have MySQL 5.7

In this case it’s straightforward: you need to use the MySQL official APT repository available in https://dev.mysql.com/downloads/repo/apt/.

At this time the most recent version is mysql-apt-config_0.8.12-1_all.deb, keep an eye before continuing this because it may change the version until you use this tutorial.

sudo wget -O /tmp/mysql.deb https://dev.mysql.com/get/mysql-apt-config_0.8.12-1_all.deb
echo mysql-apt-config mysql-apt-config/select-server select mysql-5.7 | sudo debconf-set-selections
export DB_ROOT_PASSWORD=mypassword
echo mysql-community-server mysql-community-server/root-pass password $DB_ROOT_PASSWORD | sudo debconf-set-selections
echo mysql-community-server mysql-community-server/re-root-pass password $DB_ROOT_PASSWORD | sudo debconf-set-selections
sudo DEBIAN_FRONTEND=noninteractive dpkg -i /tmp/mysql.deb
sudo apt-get update
sudo apt-get -y install mysql-server mysql-client
view raw mysql-5.7-apt.sh hosted with ❤ by GitHub

In line 2 you can change from mysql-5.7 to mysql-8.0, if unspecified the command, version 8.0 will be installed.

I run Docker and want to have 5.7 or 8.0 installed on it

It’s a bit similar to the previous situation, you still need to go to the APT repository page to know which file to download and add this on your Dockerfile:

FROM wordpress:5.0.3-php7.3-apache
### WHATEVER COMES BEFORE ###
EXPOSE 80 443 3306
ENV DEBIAN_FRONTEND noninteractive
ARG DB_ROOT_PASSWORD
RUN apt-get update
RUN apt-get -y install wget lsb-release gnupg
RUN curl -o /tmp/mysql.deb https://dev.mysql.com/get/mysql-apt-config_0.8.12-1_all.deb
RUN echo mysql-apt-config mysql-apt-config/select-server select mysql-5.7 | debconf-set-selections
RUN echo mysql-community-server mysql-community-server/root-pass $DB_ROOT_PASSWORD rot | debconf-set-selections
RUN echo mysql-community-server mysql-community-server/re-root-pass $DB_ROOT_PASSWORD rot | debconf-set-selections
RUN dpkg -i /tmp/mysql.deb
RUN apt-get update
RUN apt-get -y install mysql-server mysql-client
### WHATEVER COMES AFTER ###
view raw Dockerfile hosted with ❤ by GitHub

Notice, you can also change the version of MySQL here. Don’t forget to pass DB_ROOT_PASSWORD​ when doing your docker build using the --build-arg argument. More details here.

It works!

These are the workarounds to avoid using MySQL 5.5. After that I was able to finally automate my demo. Feel free here to share better examples of what I did, as I said, I don’t have proficiency in the subject.

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