Upgrade elasticsearch on semaphore

elasticsearch-upgrade-semaphore.sh

#!/bin/bash

###
# Script for uprading Elasticsearch to version 7.2.1
#
# Before running this script, please reset your dependency cache in Project Settings > Admin.
#
# Add the line below to your Setup commands in Project Settings (without the # at the beginning):
#
# wget https://gist.github.com/dNitza/8672749e99d52157e6821477ff64ba89/raw/elasticsearch-upgrade-semaphore.sh ; sudo bash elasticsearch-upgrade-semaphore.sh
#
###

ES_HOST="0.0.0.0"
ES_PORT="9200"
ES_VERSION=${1:-'7.2.1'}
DEB="elasticsearch-$ES_VERSION-amd64.deb"
URL="https://artifacts.elastic.co/downloads/elasticsearch/$DEB"

function wait_for_elasticsearch() {
  printf "Waiting for ElasticSearch to become available"

  while true; do
    printf "."

    nc -4 -w 5 $ES_HOST $ES_PORT 2>/dev/null && break
    sleep 1
  done
  
  printf "\n"
}

function setup_java() {
  source /opt/change-java-version.sh
  change-java-version 10
}

function remove_installed_version() {
  echo "Stopping the service, removing current Elasticsearch and its configuration..."

  service elasticsearch stop
  apt-get purge -y elasticsearch
  rm -rf /var/lib/elasticsearch
}

function install_version() {
  if ! [ -e $SEMAPHORE_CACHE_DIR/$DEB ]; then
    echo "Downloading Elasticsearch $ES_VERSION..."
    wget -O $SEMAPHORE_CACHE_DIR/$DEB $URL
  fi

  echo "Installing Elasticsearch $ES_VERSION..."
  echo 'Y' | dpkg -i $SEMAPHORE_CACHE_DIR/$DEB

  echo "Configuring Elasticsearch..."

  # Set the service to start on all runlevels
  update-rc.d elasticsearch defaults 95 10
  service elasticsearch stop

  # Default configuration for this version of Elasticsearch
  # It may not work with latest versions, be careful
#   echo 'index.number_of_shards: 1' >> /etc/elasticsearch/elasticsearch.yml
#   echo 'index.number_of_replicas: 0' >> /etc/elasticsearch/elasticsearch.yml
#   echo 'network.bind_host: "0.0.0.0"' >> /etc/elasticsearch/elasticsearch.yml
  service elasticsearch start

  echo "Installation completed successfully."
}

function run_health_check() {
  echo "Running health check..."
  curl http://"$ES_HOST":"$ES_PORT"/_cluster/health?pretty=true
}

if [ $EUID != 0 ]; then echo 'This script must be run as root, or by using sudo.'; exit 1; fi

setup_java

remove_installed_version

install_version

wait_for_elasticsearch

run_health_check

echo "Upgrade complete. Elasticsearch status:"
curl 'http://0.0.0.0:9200/?pretty'