Check nginx active connection without HttpStubStatusModule

Question

We want to check the number of active connections without the module HttpStubStatusModule being installed.

What would be the equivalent Linux command?

As a base line, we test on a machine with HttpStubStatusModule installed first, e.g.

Active connections: 6146 <-- from HttpStubStatusModule

# netstat -an | grep :80 | wc -l
1266

# netstat -an | grep :443 | wc -l
25082

It seems to me that none of the above netstat give me the correct figure.

Any idea?

Solution

Try excluding TIME_WAIT or grepping ESTABLISHED only

netstat -an | grep :443 | grep -v TIME_WAIT | wc -l

or

netstat -an | grep :443 | grep ESTABLISHED | wc -l

Comments

[kei1aeh5quahQu4U]

Did you consider checking only for established connections? e.g. $ sudo netstat -antp | grep ESTABLISHED | grep nginx

[Martin Dimitrov]

The two commands give very different results. The first reports 3380 connections but the second - just 9. Why is that so? We use WebSockets. Can this be the reason?

[whirlwin]

This is very brittle. What if there is other software running on the machine, e.g. other monitoring systems ingress/egress which connects to 443?