Interactive bash dialog runner for AWS CFN stack management

cfn-runner-k8s-boilerplate.sh

#!/bin/bash

set -x
# check packages
AWS_CLI_PATH="/usr/local/bin/aws"
DIALOG_CLI_PATH="/usr/local/bin/dialog"
if ! $DIALOG_CLI_PATH 2&>/dev/null; then
    echo "dialog package package doesnot installed, please install it"
fi
if ! $AWS_CLI_PATH --version 2&>/dev/null; then
    echo "aws cli package package doesnot installed, please install it and configure credentials"
fi

#global vars
CFN_TEMPLATE_URL="https://gist.githubusercontent.com/naumvd95/0c30a9b3039e429c344099144b51e065/raw/0521568f8273819abd077c8be68964b1e0b86a6a/aws-cfn-3-node-k8s-cluster.yaml"
CFN_TEMPLATE_FILEPATH="/tmp/vn-cfn-k8s-stack-boilerplate.yaml"
MENU_OUTPUT="/tmp/cfn-stack-menu-output-$(date +%m-%d-%Y).log"
# frequently managed
: "${CFN_STACK_NAME:=vn-k8s-stack-boilerplate}"
: "${AWS_KEYPAIR_NAME:=vn-k8s-keypair}"
: "${AWS_PROFILE:=}"
: "${AWS_PUBKEY_PATH:=vn-k8s-keypair.pub}"

# trap and delete temp files
trap 'echo "temp files will be deleted" && rm $CFN_TEMPLATE_FILEPATH; rm $MENU_OUTPUT; exit' SIGHUP SIGINT SIGTERM EXIT

function profile_checker {
    if [ -z ${AWS_PROFILE} ]; then
        echo please set AWS_PROFILE variable in script/ENV.
        exit 1
    fi
}

function display_menu {
    local x_coord=15
    local y_coord=45
    local output=${1}

    dialog --title "K8s cluster cfn boilerplate" --menu \
        "Operate cloudformation template ops using arrows or numbers" \
        $x_coord $y_coord 5 \
        1 "Create aws ssh keypair" \
        2 "Import existing ssh keypair" \
        3 "Create stack" \
        4 "Stack Status" \
        5 "Wait for stack creation" \
        6 "Get instances ip" \
        7 "Delete stack" \
        8 "Delete keypair from aws account" \
        Q "Quit" 2>"$output"
}

function cfn_download {
    if [ ! -f ${CFN_TEMPLATE_FILEPATH} ]; then
        wget -q --show-progress ${CFN_TEMPLATE_URL} -O ${CFN_TEMPLATE_FILEPATH}
    fi
}

function main {
    while true; do

        profile_checker
        display_menu "$MENU_OUTPUT"
        case $(<"${MENU_OUTPUT}") in
            1) ssh-keygen -t rsa -C ${AWS_KEYPAIR_NAME} -f ${AWS_KEYPAIR_NAME}; \
               aws ec2 import-key-pair --key-name ${AWS_KEYPAIR_NAME} \
               --profile ${AWS_PROFILE} \
               --public-key-material file://${AWS_PUBKEY_PATH} && \
               echo "Keypair imported successfully, stored in ${AWS_PUBKEY_PATH}"; \
               sleep 2;;

            2) aws ec2 import-key-pair --key-name ${AWS_KEYPAIR_NAME} \
               --profile ${AWS_PROFILE} \
               --public-key-material file://${AWS_PUBKEY_PATH} && \
               echo "Keypair imported successfully, stored in ${AWS_PUBKEY_PATH}"; \
               sleep 2;;

            3)
                cfn_download
                aws cloudformation create-stack \
                --profile ${AWS_PROFILE} \
                --template-body file://${CFN_TEMPLATE_FILEPATH} \
                --stack-name ${CFN_STACK_NAME} \
                --capabilities CAPABILITY_NAMED_IAM \
                --parameters \
                ParameterKey=KeyName,ParameterValue=${AWS_KEYPAIR_NAME};;

            4) aws cloudformation describe-stack-events \
                --profile ${AWS_PROFILE} \
                --stack-name ${CFN_STACK_NAME} \
                --max-items 4; \
                sleep 2;;

            5) aws cloudformation wait stack-create-complete \
                --profile ${AWS_PROFILE} \
                --stack-name ${CFN_STACK_NAME};;

            6) aws cloudformation describe-stacks \
                --profile ${AWS_PROFILE} \
                --stack-name ${CFN_STACK_NAME} \
                --query "Stacks[0].Outputs" \
                --output text; \
                sleep 5;;

            7) aws cloudformation delete-stack \
                --profile ${AWS_PROFILE} \
                --stack-name ${CFN_STACK_NAME};;

            8) aws ec2 delete-key-pair \
                --profile ${AWS_PROFILE} \
                --key-name ${AWS_KEYPAIR_NAME};;

            Q) echo "Bye Bye"; \
               rm "${CFN_TEMPLATE_FILEPATH} ${MENU_OUTPUT}" 2>/dev/null; \
               exit 0;;

            *) echo "Unknown command"; exit 1 ;;
        esac

    done


}

main