How can we create two instances of memcached server in same server in different port?

Question

I tried to add in the way -l 11211 -l 11212 in memcached conf file. But it is just listening to first one i.e 1121

Answer 1

Here's what memcached says the -l command is for:

-l <addr>     interface to listen on (default: INADDR_ANY, all addresses)               <addr> may be specified as host:port. If you don't specify               a port number, the value you specified with -p or -U is               used. You may specify multiple addresses separated by comma               or by using -l multiple times 

First off you need to specify the interface you want memcached to listen on if you are using the -l flag. Use 0.0.0.0 for all interfaces and use 127.0.0.1 is you just want to be able to access memcached from localhost. Second, don't use two -l flags. Use only one and separate each address by a comma. The command below should do what you want.

memcached -l 0.0.0.0:11211,0.0.0.0:11212 

Keep in mind that this will have one memcached instance listen on two ports. To have two memcached instances on one machine run these two commands.

memcached -p 11211 -d  memcached -p 11212 -d 

Answer 2

First I used mikewied's solution, but then I bumped into the problem of auto starting the daemon. Another confusing thing in that solution is that it doesn't use the config from etc. I was about to create my own start up scripts in /etc/init.d but then I looked into /etc/init.d/memcached file and saw this beautiful solution

# Usage: # cp /etc/memcached.conf /etc/memcached_server1.conf # cp /etc/memcached.conf /etc/memcached_server2.conf # start all instances: # /etc/init.d/memcached start # start one instance: # /etc/init.d/memcached start server1 # stop all instances: # /etc/init.d/memcached stop # stop one instance: # /etc/init.d/memcached stop server1 # There is no "status" command. 

Basically readers of this question just need to read the /etc/init.d/memcached file.

Cheers