Rails + Dalli memcache gem: DalliError: No server available

Question

Hi I\'m having trouble setting up my Rails project on my server because apache keeps complaining

DalliError: No server available.

I installed

Answer 1

The accepted answer will probably solve the issue for 95% of people who are seeing this error, but in my case I found the issue to be far more fundamental:

From the server, I was unable to ping 127.0.0.1. This meant Dalli could not connect to the memcache server, which by default runs on 127.0.0.1:11211.

There are a number of things that could cause this issue, but the most likely is simply a missing network interface. If you run ifconfig, you should see something like this in the output:

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:15686 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15686 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:23730314 (23.7 MB)  TX bytes:23730314 (23.7 MB)

If this is missing, ensure your /etc/network/interfaces file contains the following local interface definition:

auto lo
iface lo inet loopback

And then restart the networking service:

sudo /etc/init.d/networking restart