Useful functions to list your instances and eventually ssh to it

aws-ec2-snippets.sh

# Get a formatted list of instances from an instance name (or a part of it)
function instances_ips(){
  local instance_name=$1

  [ -z ${instance_name} ] && { echo "Missing instance name"; return 1; }
  aws ec2 describe-instances \
    --filters Name=tag:Name,Values=${instance_name} \
    --query 'Reservations[*].Instances[*].{ID:InstanceId, Name:Tags[?Key==`Name`].Value, PrivateIP:PrivateIpAddress, PublicIp:PublicIpAddress, State:State.Name}' \
    --output json \
    --region us-west-1 | jq -r ".[] | .[] | {Id: .ID, Name: .Name[0], PrivateIP: .PrivateIP, PublicIp: .PublicIp, State: .State}"
}

# From an instance-id, get some details about an EC2 instance
function instance_details(){
  local instance_id=$1

  [ -z ${instance_id} ] && { echo "Missing instance id"; return 1; }
  aws ec2 describe-instances \
    --filters Name=instance-id,Values=${instance_id} \
    --query 'Reservations[*].Instances[*].{ID:InstanceId, Name:Tags[?Key==`Name`].Value, PrivateIP:PrivateIpAddress, PublicIp:PublicIpAddress, State:State.Name}' \
    --output json \
    --region us-west-1 | jq -r ".[] | .[] | {Id: .ID, Name: .Name[0], PrivateIP: .PrivateIP, PublicIp: .PublicIp, State: .State} | to_entries |map(\"\(.key)=\(.value|tostring)\")|.[] "
}

# From an instance id, Use instance_details function to get it's public ip and then ssh to it
# For this to work automatically, you'll neeed to setup your ssh config properly
function ssh_instance_id(){
  local instance_id=$1
  [ -z ${instance_id} ] && { echo "Missing instance id"; return 1; }
  ssh $(instance_details ${instance_id} | awk -F'=' '/PublicIp/ {print $2}')
}