For testing purposes I had to deploy a wordpress installation and perform some work. As the standalone installation with wamp/mamp/xampp software would require time, I chose docker and containers for the deployment.
You can use the below docker-compose.yml file and have a working site stack in less than a minute.
In order to create a CI/CD pipeline with gitlab built-in functionality you should firstly create the appropriate .gitlab-ci.yml file. This is the file on which the steps will be described for the pipeline.
This file should be placed on the root structure of the branch and every time a commit is pushed on the remote repository the steps will run. Instructions have been provided from gitlab and can be found here
For this example I chose gitlab runner as the building tool and the deployment method of a docker container.
In order to install gitlab runner as a container perform the below steps:
Register gitlab with your runner. You should get the registration token and runner url from your repository settings.
Inspect container and press gitlab-runner register
Start the runner
The runner should have been registered on your gitlab environment
Perform a commit and push changes to your repository
The run task should have started
Check the pipeline and see its status
The job was not succesful and by checking the logs I could verify that DNS resolution could not be enstablished.
In order to fix that you should add an entry for your named gitlab container to your gitlab runner. Unfortunately there are no tools like vim, nano installed on gitlab-runner. However you can bypass this by echoing a value in your /etc/hosts file.
It is also important that your local computer can resolve by fqdn your gitlab deployment. This is necessary because docker should be able to read this entry and perform actions on it.
After those changes you will be able to run your pipeline successfully.
In this article I will explain a HAproxy installation on docker centos images. First things first, 3 centos images should be deployed. Two of them will be simple web servers with httpd installed and the third one will have haproxy installed to load balance between the two web servers.
In order to deploy 3 new centos docker images you should first download the latest centos image.
Just pull the Centos docker image from dockerHub by using the below command
docker pull centos
And then deploy 3 instances of it:
docker container run -it --name centos-lab1 -d centos:latest
docker container run -it --name centos-lab2 -d centos:latest
docker container run -it --name centos-lab3 -d centos:latest
Verify that containers have been deployed succesfully and execute some interactive commands on them.
docker exec -it centos-lab1 uname -r
You will get a result like the below, depending on the image you have installed.
Install httpd package on the two web servers. I am using portainer so that I can interact easier with containers. You could also execute an interactive command as shown below.
yum install httpd
docker exec -it centos-lab2 yum install httpd
Lastly you should install haproxy package for the third server that will be used as a load balancer.