Nginx lua: os.execute waitpid() failed (10: No child processes)

luanginx

So, I'm trying to execute a script on every request. I know how that sounds, this is for development environment.

I've added this to my nginx config access_by_lua_file "/opt/nginx/git-magic.lua";

git-magic.lua contains local status = os.execute('/opt/nginx/git-magic.sh')

And git-magic.sh contains: echo hello >> /tmp/git-magic

The issue is:

Whenever I hit any URL, I get the following in the nginx error log: 2012/09/27 15:35:48 [alert] 3241#0: waitpid() failed (10: No child processes)

Any ideas what I might be doing wrong?

Best Answer

The lua-resty-shell claims to solve this issue by supplying a non-blocking os.execute equivalent.

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Earlier we've written a solution that dynamically gets the document root based on the domain or domain alias specified. It uses a mysql database to store domainname to alias mappings. The link to it is http://www.logicwreck.com/index.php/2012/09/11/dynamic-hosts-for-nginx-with-database-storage-of-domain-and-alias-info/
A pretty interesting hack as it can prevent you from having multiple configured virtual hosts, and have just one instead.

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This is possible using response properties:

response = ngx.location.capture("/bar")
for headerName, header in pairs(response.header) do
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end
ngx.status = response.status
ngx.say(response.body)
ngx.exit(response.status)

Best Answer

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Nginx & Lua: Hacks, optimizations & observations

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