Re: Node and rc.d

[Remi L.]

I tried to change the JS code:

--8<--

console.log("Read server.js");

// debug require() => node_modules/ access

try {
    const express = require("express");
    console.log("require() OK");

    const app = express();

    app.get("/", (req, res) => {
        res.send("Hello from OpenBSD");
    });

    app.listen(80, () => {
        console.log("Server started on port 80");
    });
} catch (error) {
    console.log("require() failed!");
}

--EOF--

openbsd# rcctl start app
app(ok)
openbsd# cat /tmp/server.js.log
Read server.js
require() OK
Server started on port 80
openbsd# pgrep node
99648
openbsd# reboot

openbsd# cat /tmp/server.js.log
Read server.js
require() OK
Server started on port 80
openbsd# pgrep node

If I uninstall the express.js module: npm remove express

run: rcctl start app

openbsd# cat /tmp/server.js.log
Read server.js
require() failed!

I really don't understand why it doesn't work on reboot.

/Remi


Le 2023-09-27 23:42, Remi L. a écrit :

Thank you for your reply Lucas.

After the changes:

openbsd# rcctl start app
app(ok) -- it takes about 10 seconds to get it done
openbsd# pgrep node
76957
openbsd# cat /tmp/server.js.log
Server started on port 80
openbsd# rcctl stop app
openbsd# reboot

then:

openbsd# pgrep node
openbsd# cat /tmp/server.js.log
Server started on port 80
openbsd# pgrep node
openbsd# netstat -anf inet | grep 80
openbsd#

Same issue, I think it drop the require()... it continues, that's why
we get the Server started... message.

/Remi


Le 2023-09-27 23:26, Lucas a écrit :

"Remi L." <r...@sysdev.re> wrote:

Hello everyone,

I am an OpenBSD user and I recently installed Node.js. I managed to

create an rc.d script to start a basic Node.js application, but it only

starts manually.

At OpenBSD boot, I can see that the application is started, but it
doesn't work. I have the impression that it is related to the
node_modules directory, because after inspection, the JavaScript file
seems to stop at the line :

const express = require("express");

It cannot load the express module.

Here are the full details so that you can reproduce the same error on
your side:

OpenBSD version: 7.3 (release + syspatch)

Node version: 18.15.0

npm version: 9.5.0

Let's create a basic node.js app:

mkdir /var/www/htdocs/app
cd /var/www/htdocs/app/
npm init -y
npm install express
touch server.js
chown -R www.www /var/www/htdocs/app
chmod -R 775 /var/www/htdocs/app

/var/www/htdocs/app/server.js file:

--8<--
const express = require("express");

const app = express();

app.get("/", (req, res) => {
   res.send("Hello from OpenBSD");
});

app.listen(80, () => {
   console.log("Server started on port 80");
});

--EOF--

You can run `node server.js` to test the url: http://your-ip

Ctrl-c to quit

Now let's create the /etc/rc.d/app script:

--8<--
#!/bin/ksh

daemon="/usr/local/bin/node"
daemon_execdir="/var/www/htdocs/app"
daemon_flags="server.js"
daemon_logger="daemon.info"

After checking rc_exec() in /etc/rc.d/rc.subr, a hack you can try to get

more information is removing the daemon_logger variable and change
daemon_flags to

        daemon_flags="server.js >/tmp/server.js.log 2>&1

That should create a /tmp/server.js.log file with the program's stdout
and stderr. Give it a try with rcctl start / stop, and if it works, go
with a reboot.

#daemon_rtable=0
#daemon_timeout=30
#daemon_user=root

. /etc/rc.d/rc.subr

#pexp="$(eval echo ${daemon}${daemon_flags:+ ${daemon_flags}})"
rc_bg="YES"
rc_reload="NO"
#rc_reload_signal=HUP
#rc_stop_signal=TERM
#rc_usercheck= # (undefined or "NO")

#rc_configtest() {
#}

#rc_pre() {
#}

#rc_start() {
#       rc_exec "${daemon} ${daemon_flags}"
#}

#rc_check() {
#       pgrep -T "${daemon_rtable}" -q -xf "${pexp}"
#}

#rc_reload() {
#       pkill -${rc_reload_signal} -T "${daemon_rtable}" -xf "${pexp}"
#}

#rc_stop() {
#       pkill -${rc_stop_signal} -T "${daemon_rtable}" -xf "${pexp}"
#}

#rc_post() {
#}

rc_cmd $1
--EOF--

chmod +x /etc/rc.d/app
rcctl enable app

Start the app: rcctl start app

Check in the browser or use: netstat -anf inet | grep 80

Stop the app: rcctl stop app

Check that it is not anymore started: pgrep node => nothing

- Reboot -

If I do a `dmesg -s`, I can see the following line:

starting package daemons: app.

No errors, no output, even in the /var/log/daemon log.

I would be very grateful for any help or advice that you can provide.



Sincerely,

-- Remi

"Everyone makes mistakes, and the best way to learn is from our
mistakes." - Henry Ford

--
-- Remi