AWS ec2 instances hostname ssh completion

aws_hosts_completion

#
# Autocomplete a ssh command with AWS instances hostname
# Put this file in /etc/bash_completion.d/ (Ubuntu)
#

# File containing ec2 instances hostname
HOSTS=/tmp/aws_hosts_list

_ssh_hosts()
{
  local cur prev opts
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  prev="${COMP_WORDS[COMP_CWORD-1]}"
  opts=$(cat $HOSTS)

  COMPREPLY=( $(compgen -W "$opts" -- ${cur}) )
  return 0
}
complete -F _ssh_hosts ssh

list_aws_hostname

#
# List all ec2 instances hostname in a single file every 30 minutes
# Note: you need to have AWS Command Line Interface installed
#

*/30 * * * * zenclerk aws ec2 describe-instances --query 'Reservations[].Instances[].Tags[?Key==`Name`].Value[]' --output text | tr '\t' '\n' > /tmp/aws_hosts_list