External documentation

For any info on memcached use, follow this link: External documentation on memcached

Service Check

To check if memcached service is running, launch this command and check its output on server vldantemem001.lnf.infn.it (192.168.198.20) as root user:

[root@vldantemem001 ~]# systemctl status memcached

If the service is active (view following screenshot) then it's running, otherwise read which errors are reported.

LNF DA Control Group > Memcached Management > Screenshot from 2020-03-27 14-30-15.png

Monitoring Service

The service is monitored by grafana

Grafana monitoring service

Client Test

Try to connect to memcached service with the following command:

telnet vldantemem001.lnf.infn.it 11211

The server must answer like the following screenshot:

LNF DA Control Group > Memcached Management > Screenshot from 2020-03-27 14-35-53.png

Try to send a command that do not interfere with the memory content, for example:

stats

The server will respond like this screenshot:

LNF DA Control Group > Memcached Management > Screenshot from 2020-03-27 14-39-04.png

List all keys (libmemcached-tools package) :

memcdump --server vldantemem001.lnf.infn.it

For more commands, refer to Memcached Wiki Page.

Stop Service

WARNING: All control system programs relies on this service. BE CAREFUL WHEN STOPPING THIS SERVICE

To stop memcached, run this command as root user:

[root@vldantemem001 ~]# systemctl stop memcached

Start Service

To start memcached, run this command as root user:

[root@vldantemem001 ~]# systemctl start memcached

Restart Service

To restart memcached, run this command as root user:

[root@vldantemem001 ~]# systemctl restart memcached