k8s-gcp-cicd

Provisioning a kubernetes cluster with terraform and ansible on GCP with the help of a user-defined gitlab runner and Gitlab CI/CD pipeline

prerequisites

You need the following steps to be followed before deploying the kubernetes cluster

1. A specific Gitlab Runner

You need to have a Gitlab-runner deployed in the aws infrastructure to carry out the build jobs.

a) Spin up an centos 07 virtual machine (g1-small) is enough to accomodate the gitlab-runner

b) Download the gitlab-runner binary

# For Debian/Ubuntu/Mint
curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | sudo bash

# For RHEL/CentOS/Fedora
curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh | sudo bash

then install the gitlab-runner

# For Debian/Ubuntu/Mint
sudo apt-get install gitlab-runner

# For RHEL/CentOS/Fedora
sudo yum install -y gitlab-runner

then add the runner to the root privileges group

//debian
sudo usermod -a -G sudo gitlab-runner

//centos
sudo usermod -a -G wheel gitlab-runner

then edit the visudo file to provide the root access with no password. type

sudo visudo

and add under the sudoers

gitlab-runner ALL=(ALL) NOPASSWD: ALL

then register the runner

sudo gitlab-runner register

Or you can either provision gitlab-runner with GCP instance group with instance templates. Create a GCP instance template by giving start_script as below.

#!/bin/sh
sudo yum update -y 
sudo yum install ansible -y
sudo su -
curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh | sudo bash
yum update -y
yum install gitlab-runner -y
usermod -a -G wheel gitlab-runner / usermod -aG sudo username
sh -c "echo \"gitlab-runner ALL=(ALL) NOPASSWD: ALL\" >> /etc/sudoers"
export CI_SERVER_URL=https://gitlab.com/
export RUNNER_NAME=banuka
export REGISTRATION_TOKEN=-M8Gist6QE-sTJgzzVwJ
export REGISTER_NON_INTERACTIVE=true
export RUNNER_EXECUTOR=shell
export RUNNER_TAG_LIST=banuka
gitlab-runner register
gitlab-runner uninstall
gitlab-runner install --working-directory /root --user root
service gitlab-runner restart
echo "hi"

Above, the value you specify for RUNNER_TAG_LIST should be the name you refer in the tags field in your .gitlab-ci.yml. And provide the REGISTRATION_TOKEN as well. You can find this token under the Settings of your repo.