monitor active worker connections via prometheus/lua interface?

smparkes · 2018-04-06T07:54:07+00:00

Keep in mind that constraining your cache to one machine's memory increases the complexity if you might need to scale out in the future (because you'...

monitor active worker connections via prometheus/lua interface?

smparkes

We use the lua/prometheus plugin/bridge to collect some nginx metrics into prometheus.

We've had cases where we've blown the number of worker connections available which leads us to want to be able to monitor the active number of connections over time.

I've looked to see if there's a way to pull this active number of worker connection via the lua interface but have come up short ... but, then, I'm not too familiar with the code.

Anybody able to comment definitively on whether this is or isn't possible?

rpaprocki

I don't believe there's a Lua-space interface for this.

You may want to look into systemtap tooling likelike https://github.com/openresty/openresty-systemtap-toolkit#ngx-active-reqs and https://github.com/openresty/stapxx#ngx-count-conns.

On Thu, Apr 5, 2018 at 4:54 PM, Steven Parkes <smp...@smparkes.net> wrote:

We use the lua/prometheus plugin/bridge to collect some nginx metrics into prometheus.

We've had cases where we've blown the number of worker connections available which leads us to want to be able to monitor the active number of connections over time.

I've looked to see if there's a way to pull this active number of worker connection via the lua interface but have come up short ... but, then, I'm not too familiar with the code.

Anybody able to comment definitively on whether this is or isn't possible?

.

smparkes

That's what I figured. Thanks for the confirmation!

On Thu, Apr 5, 2018 at 4:56 PM, Robert Paprocki <rpap...@fearnothingproductions.net> wrote:

I don't believe there's a Lua-space interface for this.

You may want to look into systemtap tooling likelike https://github.com/openresty/openresty-systemtap-toolkit#ngx-active-reqs and https://github.com/openresty/stapxx#ngx-count-conns.

On Thu, Apr 5, 2018 at 4:54 PM, Steven Parkes <smp...@smparkes.net> wrote:
We use the lua/prometheus plugin/bridge to collect some nginx metrics into prometheus.

We've had cases where we've blown the number of worker connections available which leads us to want to be able to monitor the active number of connections over time.

I've looked to see if there's a way to pull this active number of worker connection via the lua interface but have come up short ... but, then, I'm not too familiar with the code.

Anybody able to comment definitively on whether this is or isn't possible?

.