CH-7 lab

nayib

How do you set up your package.json so that you can start the three servers with one command PORT=3000 BOAT_SERVICE_PORT=3333 BRAND_SERVICE_PORT=3334 npm start

Is it necessary to use the concurrently tool ? or is there another way ?

Thanks
@davidmarkclements

gregsheppard

https://mywiki.wooledge.org/BashSheet#line-15

davidmarkclements

@nayib

the command you've described should work on Linux/Mac
On windows you'd need to use set before running the command

set PORT 3000
set BOAT_SERVICE_PORT 3333
set BRAND_SERVICE_PORT 3334
npm start

If you wanted to modify the package.json directly and hard code the port numbers you can inline them on Linux/Mac like so:

  "start": "PORT=3000 BOAT_SERVICE_PORT=3333 BRAND_SERVICE_PORT=3334 <whatever command you use to start the app>"

This, obviously, won't work on Windows. To achieve something similar in Window see https://www.npmjs.com/package/cross-env - bear in mind that the exam takes place in a Linux environment.

nayib

Thanks @davidmarkclements

Im using linux.

What Im trying to do is to start the 3 servers with one command. I currently have the following in the package.json but it appears it does not work:

"start": "PORT=3000 BOAT_SERVICE_PORT=3333 BRAND_SERVICE_PORT=3334 node brand-service.js boat-service.js && fastify star -l info app.js"

Thanks in advance.

gregsheppard

This format should work:

PORT_A=4000 node serverA.js & PORT_B=5000 node serverB.js & PORT=3001 fastify start -l info app.js

nayib

Thanks @gregsheppard . Yes, using the & woks to run several commands in linux bash/temrinal but for some reason it is not taking the environment variables but starting the servers in other ports. I need to recheck my code implementation. Thank you.

gregsheppard

I realized after I posted the above that the fastify server won't have access to the PORT_A and PORT_B ENV variables so try this instead:

export PORT_A=4000 PORT_B=5000 PORT=3001; node serverA.js & node serverB.js & fastify start -l info app.js

nayib

Hi Greg. it is still don't work, but thank you so much for your help.

gregsheppard

My apologies @nayib, I was more focused on responding with a demo of the shell grammar and hadn't tested it on the course code. I went back and fired it up and now have something verified but it got long enough to make a separate shell script that npm start executes.

Here's the folder structure:

.
├── bicycle-service.js
├── brand-service.js
└── consuming-service
    ├── app.js
    ├── node_modules
    ├── npm_start_script <-------- This is the script below
    ├── package-lock.json
    ├── package.json
    ├── plugins
    ├── routes
    └── test

Here's the script:

BICYCLE_SERVICE_PORT=4000
BRAND_SERVICE_PORT=5000

PORT="$BICYCLE_SERVICE_PORT" node ../bicycle-service.js &
PORT="$BRAND_SERVICE_PORT" node ../brand-service.js &
PORT=3001 fastify start -w -l info -P app.js

And finally, this is what I have in the package.json scripts:

"start": "sh npm_start_script"

This way all three services have their own process.env.PORT but the consuming service can also access the ports of the other two via process.env.BICYCLE_SERVICE_PORT and process.env.BRAND_SERVICE_PORT.

Let me know if you have any luck with this one.

davidmarkclements

this is as good a way as any

nayib

@gregsheppard thanks, it is a nice solution.