On 21.01.20 09:58, Amish wrote:
Recently, I started using netdata to monitor various system functions
(which also monitors squid)
I am using squid (v4.9) with transparent (NAT) as well as Proxy mode
(on different ports). Network has 10-15 users. Some on transparent
proxy (redirection to port 3128) and some via proxy setting (port
8080) in browser.
Netdata calls squidclient every second to fetch squid statistics. (for
generating per second graphs / statistics)
After I started using netdata, everything worked fine for a while. But
then many users started complaining that they are not able to access
sites. (Sometimes it worked and sometimes not.)
I could see SYN packets coming in but there were no SYN,ACK going
back. I quickly went through cache.log but did not find anything.
(searched for descriptors). I believe (but not 100% sure) that this
happened only with those on transparent proxy. (again not sure)
Then I restarted the squid and all was well. But then issue happened
again and I disabled netdata's squid module and now all is working
fine from few days.
So I suspect that netdata calling squidclient every second is not a
right thing to do. Its probably causing denial-of-service on squid.
very apparently.
So:
1) Is there any squid setting which I can adjust? (File descriptors
available is 16384)
2) Is calling squidclient so frequently a right thing to do by
netdata? Its probably over loading squid. (I will report to netdata if
not)
I would use snmp for that. You surely don't need every variable available.
netdata seems to support SNMP.
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