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Create Compute Engine Instance (CentOS 8) on GCP
- Remember to open GCP firewall port TCP 8080, 8081
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Follow the guide to install NodeJs
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Add NodeSource yum repository The current LTS version of Node.js is version 10.x. If you want to install version 8 just change setup_10.x with setup_8.x in the command below. Run the following curl command to add the NodeSource yum repository to your system:
curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash - -
Install Node.js and npm Once the NodeSource repository is enabled, install Node.js and npm by typing:
sudo yum install nodejs
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Create a sample app
- Install express js
$ mkdir hello-world $ cd hello-world $ npm init * Entry Point --> specify app.js $ npm install express --save
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Edit package.json,
scriptssection"scripts": {
"start": "node app.js",
"test": "echo "Error: no test specified" && exit 1"
},
- Start the app with
$npm start, enter CTRL+C to stop> hello-world@1.0.0 start /home/weikeng/nodeApp/hello-world > node app.js Example app listening at http://localhost:8080
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Follow the guide to install docker on CentOS
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Install the yum-utils package (which provides the yum-config-manager utility) and set up the stable repository.
$ sudo yum install -y yum-utils $ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo -
Install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:
$sudo yum install docker-ce docker-ce-cli containerd.io
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Start Docker Service
$sudo systemctl start docker -
Test Docker
$sudo docker run hello-worldsample output:
Hello from Docker! This message shows that your installation appears to be working correctly. ...
(C) Create Docker Image (Ref)
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Go to your App directory `cd hello-world'
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Create a new file
vi hello-world.html<!DOCTYPE html> <html> <head> <title>Hello World V1.0 </title> </head> <body style="max-width:800px;margin:100px auto;text-align:center;"> <div style='color:blue'><h2>Hello World V1.0!</a></h2></div> <div><h3>Sample HTML File served by NodeJs + Express (Version 1.0)</a></h3></div> </body> </html> -
create new file
vi Dockerfile# Filename: Dockerfile FROM node:10-alpine WORKDIR /usr/src/app COPY package*.json ./ RUN npm install COPY . . EXPOSE 8080 CMD ["npm","start"] -
Create docker image with tagname
$sudo docker build -t flahwk/sample-node-app:v1 . -
Check the images with
$sudo docker imagesREPOSITORY TAG IMAGE ID CREATED SIZE flahwk/sample-node-app v1 664aa203625f 59 minutes ago 87.7MB -
Run the image in container
$sudo docker run -p 8080:8080 --name nodeApp1 flahwk/sample-node-app:v1open your browser and test the App withhttp://[VM1 IP]:8080 -
Check container
$sudo docker psStop Container$sudo docker stop nodeApp1Start Container$sudo docker start nodeApp1Remove Container$sudo docker rm nodeApp1 -
Push image to docker hub
$sudo docker login $sudo docker push flahwk/sample-node-app:v1
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Create another VM and install Docker as above
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Pull docker image
$sudo docker pull flahwk/sample-node-app:v1 -
Run the image in container
$sudo docker run -p 8080:8080 --name nodeApp1 flahwk/sample-node-app:v1open your browser and test the App withhttp://[VM2 IP]:8080
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In the first VM, edit the html
vi hello-world.html<!DOCTYPE html> <html> <head> <title>Hello World V2.0 </title> </head> <body style="max-width:800px;margin:100px auto;text-align:center;"> <div style='color:red'><h2>Hello World V2.0!</a></h2></div> <div><h3>Sample HTML File served by NodeJs + Express (Version 2.0)</a></h3></div> </body> </html> -
Create docker image with tagname
$sudo docker build -t flahwk/sample-node-app:v2 . -
Check the images with
$sudo docker imagesand push to docker hub$sudo docker push flahwk/sample-node-app:v2REPOSITORY TAG IMAGE ID CREATED SIZE flahwk/sample-node-app v2 664aa203625f 55 minutes ago 87.7MB -
On the 2nd VM with another console (take note this second container is running on port 8081)
- Pull the new docker image
$sudo docker pull flahwk/sample-node-app:v2 - Run the image in container
$sudo docker run -p8081:8080 --name nodeApp1 flahwk/sample-node-app:v1 - Open your browser and test the App with
http://[VM2 IP]:8081
- Pull the new docker image
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Run
$sudo docker psto list active containers in the 2nd VM