Deploy a Wordpress + MySQL setup with persistent data using rexray with a single command
This docker-compose file will bring up a Wordpress + MySQL pair on a single host. Utilizing rexray we can persist that data across multiple hosts that is compatible on multiple storage platforms. (Future version will use Docker Machine for easier deployment & libNetwork to have the containers spread across hosts)
- rexray (as of v0.1.150807) requires CentOS7. This was completed using AWS ami-96a818fe
- Docker Compose installed on the CentOS 7 hosts. Use
1.4.0or later Docker Compose Releases. - Docker Engine v 1.8+ installed on the CentOS 7 hosts.
Provision 2+ CentOS 7 hosts and issue the following commands on each:
$ sudo su
# yum update -y
# yum install numactl libaio wget device-mapper-event device-mapper-event-devel -y
# curl -sSL https://get.docker.com/ | sh
# service docker start
# chkconfig docker on
# wget -nv https://github.com/emccode/rexraycli/releases/download/latest/rexray-Linux-x86_64 -O /bin/rexray
# chmod +x /bin/rexray
# wget -nv https://raw.githubusercontent.com/emccode/rexray/master/rexray/rexray.service -O /usr/lib/systemd/system/rexray.service
//change your Environment Variables depending upon your storage system. Consult the rexray documenation to learn more
# echo 'AWS_SECRET_KEY=mysecretkey' >> /etc/environment
# echo 'AWS_ACCESS_KEY=myaccesskey' >> /etc/environment
# systemctl enable rexray.service
# systemctl start rexray.service
# exit
$ sudo su
At this point you should be able to do a docker info to see Docker information and rexray get-instance that shows what storage platforms are available to rexray.
# docker info
Containers: 0
Images: 0
Storage Driver: devicemapper
Pool Name: docker-202:1-8589003-pool
Pool Blocksize: 65.54 kB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 1.821 GB
Data Space Total: 107.4 GB
Data Space Available: 7.611 GB
Metadata Space Used: 1.479 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.146 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.93-RHEL7 (2015-01-28)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.10.0-123.8.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
CPUs: 1
Total Memory: 992.8 MiB
Name: ip-172-31-24-237
ID: XZZY:OI2U:VW4X:L46Q:WJP2:FIIS:O7NI:HHSV:J5IC:RLQV:JHNO:ZE56
# rexray get-instance
- providername: ec2
instanceid: i-e7f57c35
region: us-east-1
name: ""
Install the latest version of docker-compose (must be 1.4+) on each CentOS 7 machine
# curl -L https://github.com/docker/compose/releases/download/1.4.0/docker-compose-`uname -s`-`uname -m` > /bin/docker-compose
# chmod +x /bin/docker-compose
The data that will persist between containers that are destroyed and created must live on the storage platform. Using rexray, we will create two new volumes to store MySQL and Wordpress data. Each of these volumes is 20GB in size. You can size them however you want and depending on the platform (EBS in this case) you can specify the backing type and IOPS needed. The most important variable is the name given to the volume because that must be passed to the docker run... command. Only run this command on 1 host
# rexray new-volume --size=20 --volumename="wpdata"
# rexray new-volume --size=20 --iops=300 --volumetype="ssd" --volumename="mysqldata"
From a different host you can run rexray get-volume to see the new volume is accessible between hosts.
We will grab this docker-compose.yml file to bring up the containers on the same host. Only run this on a single host.
# mkdir /home/wordpress-compose
# curl -L https://raw.githubusercontent.com/kacole2/wordpress-compose/master/docker-compose.yml > /home/wordpress-compose/docker-compose.yml
# cd /home/wordpress-compose
# docker-compose up -d
You should now be able to access the Wordpress Installation screen by accessing port 8080 on the host. Complete the Wordpress Installation.
Login to the Wordpress Admin side, Create A New Post and Click on Publish
Visit the site and you should now see a new blog post. We now have data!
We are going to kill the containers and restart them on a different host
# docker-compose kill
On a different host we will perform the same steps as before
# mkdir /home/wordpress-compose
# curl -L https://raw.githubusercontent.com/kacole2/wordpress-compose/master/docker-compose.yml > /home/wordpress-compose/docker-compose.yml
# cd /home/wordpress-compose
# docker-compose up -d
Now you should be able to access your Wordpress site from a different IP address with all the data still intact. We are achieving data persistence!
If you don't want to use Docker Compose, you can start the containers manually with:
# docker run -d --name wpmysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD="87654321" --volume-driver=rexray -v mysqldata:/var/lib/mysql mysql:latest
# docker run --name wordpress --link wpmysql:mysql -e WORDPRESS_DB_PASSWORD="87654321" -p 8080:80 --volume-driver=rexray -v wpdata:/var/www/html -d wordpress
Create a fork of the project into your own reposity. Make all your necessary changes and create a pull request with a description on what was added or removed and details explaining the changes in lines of code. If approved, project owners will merge it.
wordpress-compose is freely distributed under the MIT License. See LICENSE for details.
Please file bugs and issues at the Github issues page.
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