Promote an Application using CD with GitOps and ArgoCD¶

Promote an Application using CD with GitOps and ArgoCD

Prerequisites
- Complete lab Deploy an Application using CI Pipelines with Tekton.
Set TOOLKIT_USERNAME environment variable. If you are participation in a workshop replace userdemo with your assigned username (ex. user01).
```
TOOLKIT_USERNAME=userdemo
```
(Skip if using KubeAdmin or IBM Cloud) Login to OpenShift using oc
- If using IBM Cloud cluster then login with your IBM account email and IAM API Key or Token by using the Copy Login Command
- If using a cluster that was configured with the workshop scripts outside IBM Cloud then use respective assigned username (ex. user01), and the password is password
```
oc login $OCP_URL -u $TOOLKIT_USERNAME -p password
```
Set TOOLKIT_PROJECT environment variable If you are participation in a workshop replace projectdemo based on your assigned username (ex. project01).
```
TOOLKIT_PROJECT=projectdemo
```
Verify Application is deployed in QA
- Get ArgoCD's admin password by running oc credentials
- Select ArgoCD from the Console Link and login using admin and the password you just retrieved
- Filter Applications by name ${TOOLKIT_PROJECT}-qa (ie project01-qa)
- Select the application master-qa-${TOOLKIT_PROJECT}-app (ie master-qa-project01-app)
Verify Application is running in the QA namespace corresponding to your username ${TOOLKIT_PROJECT}-qa
- Select Developer perspective, select project ${TOOLKIT_PROJECT}-qa and then select Topology from the Console and see the application running

Setup environment variable GIT_OPS_URL for the git url using the value from previous step or as following

GIT_OPS_URL=http://${TOOLKIT_USERNAME}:password@$(oc get route -n tools gogs --template='{{.spec.host}}')/toolkit/gitops
echo GIT_OPS_URL=${GIT_OPS_URL}

Clone the git repository and change directory

cd $HOME
git clone $GIT_OPS_URL
cd gitops

Review the qa and staging directory in the git repository
```
ls -l qa/
ls -l staging/
```

Promote the application from QA to STAGING by copying the app manifest files using git

git config --local user.email "${TOOLKIT_USERNAME}@example.com"
git config --local user.name "${TOOLKIT_USERNAME}"

cp -a qa/${TOOLKIT_PROJECT}/ staging/${TOOLKIT_PROJECT}/

git add .
git commit -m "Promote Application from QA to STAGING environment for $TOOLKIT_PROJECT"
git push -u origin master

Verify Application is deployed in STAGING
- Get ArgoCD's admin password by running oc credentials
- Select ArgoCD from the Console Link and login using admin and the password you just retrieved
- Filter Applications by namespace ${TOOLKIT_PROJECT}-staging (ie project01-staging)
- It might take a couple minutes for the application to show up
- Select the application master-staging-${TOOLKIT_PROJECT}-app (ie master-staging-project01-app)
- Click Refresh
Verify Application is running in the STAGING namespace corresponding to your username ${TOOLKIT_PROJECT}
- Select Developer perspective, select project ${TOOLKIT_PROJECT}-staging and then select Topology from the Console and see the application running
Propose a change for the Application in STAGING
- Update the replica count and create a new git branch in remote repo
```
cat > staging/${TOOLKIT_PROJECT}/app/values.yaml <<EOF
global: {}
app:
  replicaCount: 2
EOF

git diff

git add .
git checkout -b ${TOOLKIT_PROJECT}-pr1
git commit -m "Update Application in ${TOOLKIT_PROJECT}-staging namespace"
git push -u origin ${TOOLKIT_PROJECT}-pr1
```
- Open Git Ops from Console Link
- Select toolkit/gitops git repository
- Create a Pull Request
- Select Pull Request
- Click New Pull Request
- Select from compare dropdown the branch ${TOOLKIT_PROJECT}-pr1
- Enter a title like Update replica count for app in namespace $TOOLKIT_PROJECT
- Enter a Comment like We need more instances business is growing Yay!
- click Create Pull Request
Review the PR follow the change management process established by your team.
- Click Merge Pull Request
- Click Delete Branch
Review that application scales out
- Review in ArgoCD UI, notice there are now two pods, it takes about 4 minutes to sync, you can click Refresh
- Review in OpenShift Console, click the Deployment circle details shows 2 Pods.
Congratulations you finished this activity, continue with the lab Deploy a 3 tier Microservice using React, Node.js, and Java