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The block diagram below represents how the 'terraform' template uses the join token to create a multi-node cluster.  Once the terraform process is over, the test.sh script is run to validate the cluster set-up. If the setup was successful, the script must return the list of nodes. 

CI/CD process :

The Jenkins freestyle job waits for events from the Gerrit-Event trigger plugin and initializes the terraform process. Once the process is done, a post-build task is used to push the build log to the nexus server. The following are the steps to set up the CI/CD job. 

1. Add Gerrit credentials under Manage Jenkins > Manage credentials > Add new cred using credentials.  Enter your Gerrit user name and password. 
2. Install Gerrit trigger plugin & post-build task plugin from > Manage Jenkins > Manage plugins > Available plugins.
3. Create a new free style freestyle job and add your Gerrit account with the credentials you added in the Source Code Management section. Enter the repository URL and select the credentials that were added in step 1. 
4. Add the following to the build script  shell script under the 'Build' section.  The following scripts are used to install terraform, exports TF_VAR for terraform purposes, installs LFtools, and initializes the terraform init, plan and apply processes.   
   

   wget https://releases.hashicorp.com/terraform/0.14.9/terraform_0.14.9_linux_amd64.zip
   unzip terraform_0.14.9_linux_amd64.zip
   sudo mv terraform /usr/local/bin/
   terraform --help
   export TF_VAR_aws_region="us-east-2"
   export TF_VAR_aws_ami="ami-026141f3d5c6d2d0c"
   export TF_VAR_aws_instance="t4g.medium"
   export TF_VAR_vpc_id=""
   export TF_VAR_aws_subnet_id=""
   export TF_VAR_access_key=""
   export TF_VAR_secret_key=""
   export TF_LOG="TRACE"
   export TF_LOG_PATH="./tf.log"
   sudo apt-get update
   sudo apt-get -y install pip3python3-pip
   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
   export CRYPTOGRAPHY_DONT_BUILD_RUST=1
   apt-get install build-essential libssl-dev libffi-dev
   pip3 install lftools
   cd /var/jenkins_home/workspace/gerrit-akraino/src/foundation/microk8s
   terraform init
   terraform plan
   terraform apply -auto-approve 
   

   
   
5. Add the following to the post-build task. The post build task -build script is for pushing the build's log to the nexus server. Configure the SILO, JENKINS_HOSTNAME, JOB_NAME etc. 
   

   echo "post build tasks"
   cat /var/jenkins_home/workspace/gerrit-akraino/src/foundation/microk8s/tf.log
   echo $BUILD_NUMBER
   NEXUS_URL=https://nexus.akraino.org
   SILO=gopaddle
   JENKINS_HOSTNAME=35.239.217.210:30016<hostName/IP>
   JOB_NAME=gerrit-akraino
   BUILD_URL="${JENKINS_HOSTNAME}/job/${JOB_NAME}/${BUILD_NUMBER}/"
   NEXUS_PATH="${SILO}/job/${JOB_NAME}/${BUILD_NUMBER}"
   lftools deploy logs $NEXUS_URL $NEXUS_PATH $BUILD_URL
   echo "Logs uploaded to $NEXUS_URL/content/sites/logs/$NEXUS_PATH" 
   
   

6. To The following steps are to configure the  Gerrit trigger 
   create -trigger plugin. 
   
   Create a folder ~/.ssh
   generate Generate ssh key using ssh-keygen -m PEM 
   Register the ssh key with your Gerrit account 
   check connectivity using ssh -p 29418 ashvin301@gerrit.akraino.org
   Add the userName/email/ssh_key/hostName/port to the Gerrit trigger 
   

   Build the job. Look under /var/jenkins_home/workspace/gerrit-akraino for code 

   id_rsa.pud key in the Gerrit account under settings > ssh keys > add new keys
   Once the key is registered with the Gerrit account, test the connectivity with the following command.
            _{ssh -p 29418 <UserName>@<HostName>}