CI/CD Pipeline using Node.js and Jenkins - 5: Deployment

October 01, 2019

Now that the Continuous Integration part of my pipeline was working, today I got the Continuous Delivery/Deployment part working to automatically deploy to the live server.

Deployment

I am still following this tutorial to get this pipeline working:

First, ssh into the jenkins server and switch to the jenkins user

su — jenkins

There was no password! This lets you set the new password and switch to the jenkins user again.

sudo passwd jenkins
su - jenkins

Now need to generate a new public key:

ssh-keygen -t rsa
cat ~/.ssh/id_rsa.pub

Copy that to clipboard, then ssh into node server as twulz:

nano ~/.ssh/authorized_keys

Paste the copied ssh key into that file and change the permissions:

chmod 700 ~/.ssh
chmod 600 ~/.ssh/*

Then test the ssh setup by sshing into the node-app server from the jenkins server:

ssh twulz@157.245.55.163

YAY! Now that I’ve got the correct permissions, I can create the deployment file:

#!/bin/sh
ssh twulz@157.245.55.163 <<EOF
 cd ~/node-app
 git pull
 npm install —-production
 pm2 restart all
 exit
EOF

I need to make it executable:

chmod +x script/deploy

And back in the Jenkins console, I need to add the command to the Execute Shell script config:

whoami 
npm install
./script/test
./script/deploy

The build was failing because the service wasn’t started:

[PM2][WARN] No process found
┌──────────┬────┬─────────┬──────┬─────┬────────┬─────────┬────────┬─────┬─────┬──────┬──────────┐
│ App name │ id │ version │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ user │ watching │
└──────────┴────┴─────────┴──────┴─────┴────────┴─────────┴────────┴─────┴─────┴──────┴──────────┘
 Use `pm2 show <id|name>` to get more details about an app
Build step 'Execute shell' marked build as failure
Finished: FAILURE

So I ran this, then success!

sudo pm2 start /home/twulz/node-app/index.js

Add the dev-server configuration to the Node-App

This is a last step just for future development - currently, during development of the Node.js server I have to save the file, stop the server and re-start the server to see the updates. Using the Node-dev package, this detects any changes to the server and automatically restarts it to reflect the changes.

$ cd Documents\Github\node-app
$ git pull
$ npm install
$ node index.js

Then made some changes to the code, needed to add some dependencies:

npm install morgan --save-prod saves it to the dependencies in package.json. Also needed npm install node-dev --save-dev saves it to the devDependencies section in package.json

Then added scripts to package.json:

"scripts": {
    "dev-server": "./node_modules/.bin/node-dev ./index.js"
},

Now when I make changes it’ll automatically restart the server

Done!

Et voila! The CI/CD pipeline is up and running! Now whenever I commit code to GitHub:

1. GitHub notifies the Jenkins server
2. Jenkins server then pulls the code into a local setup
3. It then runs the automated tests
4. If the tests pass, deploy to the Node-App live server.

Next steps will be doing something a little more exciting than printing some variation of “Hello World!”