example_check_existence_of_command.sh

example_check_existence_of_command.sh

#!/usr/bin/env bash
# SOURCE: https://github.com/kodekloudhub/certified-kubernetes-administrator-course/blob/master/kubeadm-clusters/apple-silicon/deploy-virtual-machines.sh
# When VMs are deleted, IPs remain allocated in dhcpdb
# IP reclaim: https://discourse.ubuntu.com/t/is-it-possible-to-either-specify-an-ip-address-on-launch-or-reset-the-next-ip-address-to-be-used/30316

ARG=$1

set -euo pipefail

# Set the build mode
# "BRIDGE" - Places VMs on your local network so cluster can be accessed from browser.
#            You must have enough spare IPs on your network for the cluster nodes.
# "NAT"    - Places VMs in a private virtual network. Cluster cannot be accessed
#            without setting up a port forwarding rule for every NodePort exposed.
#            Use this mode if for some reason BRIDGE doesn't work for you.
BUILD_MODE="BRIDGE"


RED="\033[1;31m"
YELLOW="\033[1;33m"
GREEN="\033[1;32m"
BLUE="\033[1;34m"
NC="\033[0m"

if ! command -v jq > /dev/null
then
    echo -e "${RED}'jq' not found. Please install it${NC}"
    echo "https://github.com/stedolan/jq/wiki/Installation#macos"
    exit 1
fi

if ! command -v multipass > /dev/null
then
    echo -e "${RED}'multipass' not found. Please install it${NC}"
    echo "https://multipass.run/install"
    exit 1
fi