Memcached collector

Collects memory-caching system performance metrics. It reads server response to stats command (stats interface).

1. Network in kilobytes/s

   • read
   • written

2. Connections per second

   • current
   • rejected
   • total

3. Items in cluster

   • current
   • total

4. Evicted and Reclaimed items

   • evicted
   • reclaimed

5. GET requests/s

   • hits
   • misses

6. GET rate rate in requests/s

   • rate

7. SET rate rate in requests/s

   • rate

8. DELETE requests/s

   • hits
   • misses

9. CAS requests/s

   • hits
   • misses
   • bad value

10. Increment requests/s

    • hits
    • misses

11. Decrement requests/s

    • hits
    • misses

12. Touch requests/s

    • hits
    • misses

13. Touch rate rate in requests/s

    • rate

Configuration

Edit the python.d/memcached.conf configuration file using edit-config from the Netdata config directory, which is typically at /etc/netdata.

cd /etc/netdata   # Replace this path with your Netdata config directory, if different
sudo ./edit-config python.d/memcached.conf

Sample:

localtcpip:
  name     : 'local'
  host     : '127.0.0.1'
  port     : 24242

If no configuration is given, module will attempt to connect to memcached instance on 127.0.0.1:11211 address.

Troubleshooting

To troubleshoot issues with the memcached module, run the python.d.plugin with the debug option enabled. The output will give you the output of the data collection job or error messages on why the collector isn't working.

First, navigate to your plugins directory, usually they are located under /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the setting plugins directory. Once you're in the plugin's directory, switch to the netdata user.

cd /usr/libexec/netdata/plugins.d/
sudo su -s /bin/bash netdata

Now you can manually run the memcached module in debug mode:

./python.d.plugin memcached debug trace