Accessing Redis server on AWS

Question

I am not able to connect to my Redis server from remote AWS instance (both instances are in same VPC though)...

I have launched CentOS 6 instance and launched Redis server. I can confirm that server is running:

tcp 0 0 *:6379 *:* LISTEN 891/redis-server *
tcp 0 0 *:6379 *:* LISTEN 891/redis-server *

I have set AWS security group to be:

Custom TCP | port 6379 | 0.0.0.0/0

I am able to connect to the Redis server from the same instance using redis-cli but when I try to do it from some other AWS instance I get:

Could not connect to Redis at ec2-*.compute.amazonaws.com:6379: No route to host

• rastko: The bind options in redis config is commented... What do you suggest I should put in order to support remote connections?
• hobbs: @ItamarHaber that's the exact opposite of the truth. 0.0.0.0 means that connections are accepted on all network interfaces.
• Itamar Haber: @hobbs you're right of course - Oops.

Answer 1

Seems like you are using 127.0.0.1 IP for binding instead of 0.0.0.0. Open your /etc/redis.conf and check bind option.

• rastko: The bind option was commented, I have put the bind 0.0.0.0. Now netstat gives me column Program name with a bit different output: 1181/redis-server 0 . If you can check first comment on the question, Itamar is suggesting opposite? Any idea what is going on?

Answer 2

Turns out firewall was on, so it wasn't possible to connect from outside. So to wrap it up:

1.Set Redis to allow remote connections by setting bind 0.0.0.0 in redis.conf

2.Make sure the firewall is not preventing you to connect to your server. On AWS you can turn it off by:

sudo service iptables save
sudo service iptables stop
sudo chkconfig iptables off