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问题:
Hi I'm having trouble setting up my Rails project on my server because apache keeps complaining
DalliError: No server available.
I installed memcached on my ubuntu machine, but it still doesn't work. My rails project also has config.cache_store = :dalli_store, 'localhost:11211', { :namespace => "production" } in environments/production.rb. How would I debug this?
My log shows before each request:
localhost:11211 failed (count: 6) DalliError: No server available
telnet to 11211:
root@s2:/usr/local/www/production/current/log# telnet localhost 11211 Trying 127.0.1.1... telnet: Unable to connect to remote host: Connection refused
回答1:
I had the same problem. First I installed memcached as a gem gem install memcached and got the error "DalliError: No server available"
Then I installed memcached by doing sudo apt-get install memcached. It works fine now.
回答2:
If you're a Homebrew user:
brew install memcached
Check if the service is running:
brew services list
If not, start it:
brew services start memcached
回答3:
It was because someone changed the /etc/hosts file to point 127.0.1.1 to localhost instead of 127.0.0.1. After changing that, memcached worked.
回答4:
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
