Javascript Engine:IoT tutorial not working

[florinpatan@…]

Hello,

I'm following the IoT tutorial from here: ​https://www.nginx.com/blog/nginx-plus-iot-load-balancing-mqtt/

However, it seems that I cannot produce a valid configuration for nginx.

I'm validating the configuration with nginx -t but it seems that it's failing silently.

Step 11/12 : RUN /usr/sbin/nginx -t -c /etc/nginx/config/nginx.conf
 ---> Running in c7cde3c91ccc
nginx: configuration file /etc/nginx/config/nginx.conf test failed
The command '/bin/sh -c /usr/sbin/nginx -t -c /etc/nginx/config/nginx.conf' returned a non-zero code: 1

This issue is 100% reproducible, I've created the following project for it: ​https://github.com/dlsniper/nginx-js-issue which you can clone and reproduce it.

I've tried to identify from where the issue might come from and I can tell you that removing the following line:

js_include mqtt.js;

from mqtt.conf will result in the container successfully being built.

I've tried to reduce the JS file to just this:

function getClientId(s) {
    return s.OK;
}

function setClientId(s) {
    return "-";
}

and the configuration would still fail.

I've also tried to clone the JS module at various different revisions, without luck.

Am I doing something wrong? If so, can you please explain what as I can't see anything else that I can try and do at this point.

Please let me know if you need any further details.

Thank you for your time and help.

[Liam Crilly]

Your environment is failing because nginScript requires PCRE UTF-8. Your Dockerfile build output includes:

pcre-8.40 configuration summary:
    Enable UTF-8/16/32 support ...... : no 

We are investigating why this results in a silent error.

You may find it easier to continue the tutorial by starting with the official Dockerfile ​https://hub.docker.com/_/nginx/ and copy-in your config. This will use the binaries from our official repo. nginScript will be loaded as a dynamic module which means you will need to modify your nginx.conf to include:

load_module /etc/nginx/modules/ngx_stream_js_module.so;

I tested this approach with your config with no problems.

[xeioex]

See the patch above for your Dockerfile.

[florinpatan@…]

Hi xeioex, liam,

Thank you both for your replies.
I can confirm that just adding the change on the line 9 in the patch sent above fixes the problem. Sorry for the noise and thank you so much for the quick reply.

Kind regards,
Florin