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https://jsfiddle.net/bootstrapious/dh9bt7up

Add Swap memory to ec2 micro instance.

Remember one thing If ec2 instance memory is 1 GB then add 512 MB swap. It should be half of the instance memory.

To add this extra space to your instance you type:

sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo /sbin/mkswap /var/swap.1
sudo chmod 600 /var/swap.1
sudo /sbin/swapon /var/swap.1

If you need more than 1024 then change that to something higher.

To enable it by default after reboot, add this line to /etc/fstab:

/var/swap.1   swap    swap    defaults        0   0

Set up mongodb and create user

$> sudo apt-get install -y mongodb
$> mongo
$> use admin

Please note: only change user and password not change to role and db

$> db.createUser({ user: "admin", pwd: "pwd@123", roles: [{ role: "userAdminAnyDatabase", db: "admin" }] })
To check user auth

$> db.auth("admin", "hate2wait@123")
$> 1

create normal user

$> use db_production
$> db.createUser({ user: "myname", pwd: "anypassword", roles: [{ role: "dbOwner", db: "db_production" }] })
$> db.auth("myname", "anypassword")
$>

$> sudo nano /etc/mongodb.conf
# Turn on/off security.  Off is currently the default
#noauth = true

auth = true

Uncomment auth = true
ctrl + x

Change Id to uuid in rails postgresql

Before run this command if you have migration file in migrate folder please take backup all migration file then run this command and migrate it will work.

rails g migration enable_uuid_extension

endclass EnableUuidExtension < ActiveRecord::Migration
  def change
     enable_extension "uuid-ossp"
    enable_extension "pgcrypto"  
   end 
end