Simple bash script to create 4 Digital Ocean Droplets, each with Persistent Volumes, with a dedicated Load Balancer

provision-minio-droplets

#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

function log {
    local now=$(date +'%Y-%m-%d %H:%M:%S')
    echo "[$now] $1"
}

function create_droplet {
    doctl compute droplet create "$1" --wait --size "$2" --image "$3" --region "$4" --ssh-keys "$5" --tag-names "$6"
}

function create_volume {
    doctl compute volume create "$1" --region "$2" --size "$3" --desc "Volume for $1"
}

function attach_volume_to_droplet {
    local volume=$(doctl compute volume list | grep "$1" | awk '{ print $1 }')
    local droplet=$(doctl compute droplet list | grep "$2" | awk '{ print $1 }')
    doctl compute volume-action attach "$volume" "$droplet"
}

function create_load_balancer {
    doctl compute load-balancer create --name "$1" --region "$2" --tag-name "$3" --forwarding-rules "entry_protocol:http,entry_port:80,target_protocol:http,target_port:9000"
}

function delete_droplet {
    doctl compute droplet delete --force "$1"
}

function delete_volume {
    doctl compute volume delete "$1"
}

function delete_load_balancer {
    doctl compute load-balancer delete --force "$1"
}

DROPLET_SIZE="512mb"
DROPLET_IMAGE=$(doctl compute image list | grep "16.04.2 x64" | awk '{ print $1 }')
DROPLET_REGION="fra1"
DROPLET_SSHKEY=$(doctl compute ssh-key list | grep "[email protected]" | awk '{ print $1 }')
DROPLET_TAG="minio-cluster"
VOLUME_SIZE="100GiB"

case "$1" in
    install)

        for idx in $(seq 1 4); do

            log "Creating minio-node-$idx in $DROPLET_REGION tagged with $DROPLET_TAG"
            create_droplet "minio-node-$idx" "$DROPLET_SIZE" "$DROPLET_IMAGE" "$DROPLET_REGION" "$DROPLET_SSHKEY" "$DROPLET_TAG"
            
            log "Creating Volume for minio-node-$idx"
            create_volume "$DROPLET_TAG-volume-node-$idx" $DROPLET_REGION "$VOLUME_SIZE"
            
            log "Attaching Volume for minio-node-$idx to Droplet"
            attach_volume_to_droplet "$DROPLET_TAG-volume-node-$idx" "minio-node-$idx"

        done;

        log "Creating $DROPLET_TAG load balancer for Droplets tagged with $DROPLET_TAG"
        create_load_balancer "$DROPLET_TAG" "$DROPLET_REGION" "$DROPLET_TAG"
    ;;
    uninstall)

        log "Deleting all Droplets tagged with $DROPLET_TAG"
        for droplet in $(doctl compute droplet list | grep "$DROPLET_TAG" | awk '{ print $1 }'); do
            log "Deleting Droplet $droplet"
            delete_droplet "$droplet";
        done;

        log "Deleting all Volumes with $DROPLET_TAG in their name"
        for volume in $(doctl compute volume list | grep "$DROPLET_TAG" | awk '{ print $1 }'); do
            log "Deleting Volume $volume"
            delete_volume "$volume";
        done;

        log "Deleting all Load Balancers named $DROPLET_TAG"
        for lb in $(doctl compute load-balancer list | grep "$DROPLET_TAG" | awk '{ print $1 }'); do
            log "Deleting Load Balancer $lb"
            delete_load_balancer "$lb";
        done;
    ;;
    *)
        echo "Usage: cluster {install|uninstall}" >&2
        exit 3
    ;;
esac

Blogged at: https://anthonysterling.com/posts/creating-a-distributed-minio-cluster-on-digital-ocean.html