Centos – Memcached cache doesn’t flush

centosmemcached

I would like to flush the memcached cache keys and values on my centos server.

I have tried the telnet approach by telnetting to the port and then issuing: flush_all

It doesn't work an my values are still cached.

Does anyone know how I can accomplish this?

Best Answer

Mark all items as stale (it will not clean the cache itself)

echo flush_all | telnet 127.0.0.1 11211

Perform dump, it will clean the stale items (but it may not deallocate memory)

/usr/share/memcached/scripts/memcached-tool 127.0.0.1:11211 dump > /dev/null

You can check the cache usage by

/usr/share/memcached/scripts/memcached-tool 127.0.0.1:11211 display

Tested on memcache 1.4.13

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This looks to me as a permission problem. I don't remember the specific permissions but membase needs to have a permission to listen, start other apps and perform authentication/authorization.

Can’t connect to Memcached

Check memcached process:

$ ps aux | grep -E "[m]emcached"
hiemye     921  0.0  0.3  44040   868 ?        Ssl  12:31   0:00 memcached -d -p 11211

Check listen address:

$ lsof -np `pgrep memcached`
COMMAND   PID   USER   FD   TYPE     DEVICE SIZE/OFF   NODE NAME
memcached 921 hiemye   26u  IPv4       4449      0t0    TCP *:11211 (LISTEN)
memcached 921 hiemye   27u  IPv6       4450      0t0    TCP *:11211 (LISTEN)
memcached 921 hiemye   28u  IPv4       4453      0t0    UDP *:11211 
memcached 921 hiemye   29u  IPv6       4454      0t0    UDP *:11211

Add allow ufw rules:

ufw allow in proto tcp from 192.168.0.2/32 to 192.168.0.1/32 port 11211
192.168.0.2 - client ip
192.168.0.1 - server ip

Best Answer

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