When deploying on Amazon EC2, we have to be careful about the instances we choose. RailsCasts has provided a screencast on how to deploy Rails application on EC2, but the default values are quite a mess.
First of all, default Instance is m1.medium for VM Image type, which is not free, so we have to set the YAML file to t1.micro according to Amazon Free Tier description.
1 | image_type: t1.micro |
Besides, newly created account has only 5 limited Security Groups for us to set up, so we have to make sure the Rubber does not generate more than that number.
1 | auto_security_groups: false |
Somehow the multiple intances have trouble connecting to each other, we might want to config the pg_hba.conf file to allow IP connection.
1 | host all all 172.XX.XX.XX/24 trust |