Hi Guys,
I have a squid-3.5.28 installation that is deployed to do transparent ssl-bump
of HTTPS traffic (linux bridge, tproxy). The server is not overly busy, CPU
and RAM usage is low + no swap being used yet regularly the squid service is
choking HTTPS traffic to a point where websites are timing out. Any other
traffic flowing through the bridge is unaffected and continues to operate at
normal expected speeds.
I have checked all obvious things, CPU/RAM usage, network interface errors,
conntrack table and TCP resource exhaustion yet all look fine. There is no
caching taking place and disk IO is not a problem.
During the times where squid is slow, even using squidclient to query squid
state is extremely slow to respond, as you can see below snip from the
access.log the mgr:coutners and mgr:5min requests are taking up to 30 seconds
to complete when usually the response time is 0:
1551397216.978 31 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397220.633 0 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397233.385 2 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397237.431 14 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397262.074 2 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397280.644 17 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397314.764 1 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397330.455 5 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397377.265 4 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397385.727 0 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397396.161 17 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/5min - HIER_NONE/- - -
1551397432.974 11 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397462.897 11 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397492.759 7 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397522.611 9 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397552.521 12 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397582.484 17 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
1551397612.446 10 127.0.0.1 TCP_MISS/000 0 GET
cache_object://localhost/counters - HIER_NONE/- - -
I have a number of these severs deployed, all running same
hardware/config/squid versions and only this one is experiencing an
issue.....looking for suggestions on what could be occurring and how to debug
further?
Thanks,
Michael
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