Hello,
We run memcached version 1.4.4-3.el6 for session caching with our Moodle
environment. We are finding that memcached suddenly stops working after
a couple of weeks, and we are keen to try and work towards resolving this.
When in the failed state:
1. memcached is still running.
2. There is nothing untoward in dmesg or syslog.
3. We are able to connect to the memcache socket (TCP Port 11211) using
telnet. However, the telnet session hangs (indefinitely) after entering
‘stats’ then pressing return
4. No swap is being used by machine running memcached
No evictions have been logged. Cache hit ratio averages 98%. % used
storage of memcache averages 3.1% with a max value of 7.5%.
We also have lots of XYMon metrics / stats available - however, these
don’t show anything unusual at the time that memcached fails.
How do we go about troubleshooting this ? (The failed condition only
occurs in our production Moodle instance - i.e. we haven’t been able to
replicated it in testing/dev.)
Thanks,
Patrick Rynhart
Systems Engineer
Infrastructure Support Section
Information Technology Services
Massey University
Palmerston North
NEW ZEALAND
T: +64 6 356 9099 ext 81075
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