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We are running apache and using nagios to query http for alerting / monitoring purposes. We have a few webservers that required more sensitive settings for mod_reqtimeout.c and on those servers we periodically / sporadically get alerts about “UNKNOWN 500 read timeout”. Nothing is actually wrong with the webserver / apache when this is happening and we think we have narrowed down the problem to our relatively strict settings for:
RequestReadTimeout header=
We have quite a few vhosts configured on some of these servers and are trying to find a way to modify our global header read timeout setting to ignore certain IP addresses, for example the IP address of our nagios server.
Otherwise a way to have it only apply to certain domains, without having to specifically add the setting into every vhost entry where it needs to exist.
Is there a resource available that talks about how to limit a global parameter to ignore certain IPs or page requests?
2
Answers
According to the [official documentation][1]
[1]: https://httpd.apache.org/docs/2.4/mod/mod_reqtimeout.html, you should be able to override the global config in vhost config.
Context: server config, virtual hostAlthough you can define the timeout at both the server config and virtual host level, in my testing with Apache 2.4.41 I wasn’t able to apply a configuration at the server config level and then override it at the virtual host. It just continued to apply the server config values. So I ended up increasing values in the server config.
If you are on Ubuntu then you probably have defaults defined in
/etc/apache2/mods-available/reqtimeout.conffor the whole server which then means you aren’t able to set values for a virtual host without first changing the configuration here.There’s a short thread about this on the apache users list.