Environment variable to set server port in lua

Question

How do I set the port via environment variable with lua?

Currently my setup sets $port through lua:

server {

  set_by_lua_block $port {
    return os.getenv("PORT")

  listen       $port;

  }

However, doing so gives me this error:

nginx: [emerg] host not found in "$port" of the "listen" directive in /usr/local/openresty/nginx/conf/nginx.conf:93

Am I doing something wrong? How do I go about doing this?

Speculation: don't you need a closing curly brace after the return to balance the opening brace? — Michael - sqlbot
– Michael - sqlbot, Commented Aug 5, 2017 at 3:21
Listen doesn't accept variables. You have to generate valid config before starting nginx. Use any template tool (bash script, ansible, whatever else) — Alexey Ten
– Alexey Ten, Commented Aug 5, 2017 at 6:00
Thanks @AlexeyTen if you want to add that as an answer, I will accept it. — Amin Shah Gilani
– Amin Shah Gilani, Commented Aug 6, 2017 at 0:48

Amin Shah Gilani · Accepted Answer · 2018-10-15 15:13:47Z

1

The answer as posted in a comment, but wasn't posted, so I'll do it to close this out.

Listen doesn't accept variables. You have to generate valid config before starting nginx. Use any template tool (bash script, ansible, whatever else)

— Alexey Ten

If you're looking for a templating engine, I recommend ERB. See my answer to a different question here.

answered Oct 15, 2018 at 15:13

Amin Shah Gilani

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