Connecting to remote mongo, redis, postgres

remote db connection

##Redis
change redis conf in remote server


```
vim /etc/redis/redis.conf
# change the original to this line
bind 0.0.0.0
```

try with:
```
redis-cli -h remote.FQDN ping  #replace FQDN for your dns
PONG
```
##Mongodb

in /etc/mongod.cong

comment this line:

```
#bind_ip = 127.0.0.1
```


##Postrgresql
in /etc/postgresql/version.number/main/postgres.conf

listen_addresses='*'

and in pg_hba.conf

host all all 0.0.0.0/0 md5