Cap development/production deploy: 

error: RAILS_ENV="production" rake assets:precompile 
Killed

The error is coming because of out of RAM memory, so need to do swap the memory-

follow these command for memory swapping -

sudo swapon -s

Check how much disk space now you have:

 df

create a swap file:

1. Allocate a file for swap

sudo fallocate -l 2048m /mnt/swap_file.swap

2: Change permission

sudo chmod 600 /mnt/swap_file.swap

3: Format the file for swapping device

sudo mkswap /mnt/swap_file.swap

4: Enable the swap

sudo swapon /mnt/swap_file.swap

5: Make sure the swap is mounted when you Reboot. First, open fstab

sudo nano /etc/fstab

and

# /etc/fstab
/mnt/swap_file.swap none swap sw 0 0 

Save it. 

run cap production deploy 

or 

runrake assets:precompile on server 

Cheers,

Hemant