My customers are running many scripts that uses memcached, but all of them are using localhost as a address. My localhost server is now out of RAM, because it's doing many other things like WWW and MySQL servers.

Now I got a brand new server with 16 GB RAM which I can use as a dedicated memcached server. How to redirect localhost:12111 to domain.com:12111 server ?

I can't switch localhost to something else in /etc/hosts because all my databases use such address.


Make an effort, 1 minute of Googling would give you the answer.

In no particular order, you could use:

  1. Xinetd
  2. Rinetd
  3. IPTables
  4. SSH tunnel
  5. Netcat
  6. Layer 4-7 balancing (eg haproxy)

Or do a simple grep for localhost and replace it with a hostname that you can change.


sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -t nat -A PREROUTING -d -p tcp --dport 11211 -j DNAT --to


echo " 11211 11211" >> /etc/rinetd.conf
/etc/init.d/rinetd restart


nc -l -p 11211 -c "nc 11211"


ssh user@ -L 11211:


cat > /etc/xinet.d/memfw << eof
  service memfw {
    disable = no 
    type = UNLISTED 
    socket_type = stream 
    protocol = tcp 
    user = nobody 
    wait = no 
    redirect = 11211
    port = 11211
  • I think first and the last are far the best. Jun 24 '12 at 23:01

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.