dev11/ghe_HA_script.txt at master · DevTools1/dev11 · GitHub

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install postfix
sudo apt-get install mailutils
sudo apt-get update
check mail in /usr/bin
send mail using
echo "This is message body" | mail -s "This is Subject" sandeshs@devtools.in, vishwasm@devtools.in.
check mail -> spam
after delay
promotion takes place.

sudo vi check.sh

if ping -c 10 primary-hostname; then
echo "server up"
else
echo "server down"
  sleep 3m;
  if ping -c 10 primary-hostname; then
  echo "server up"
  else
  echo "server down"
  echo "This is message body" | /usr/bin/mail -s "This is Subject" someone@example.com
  sleep 15m
  ssh -p 122 admin@replica-hostname
  ghe-repl-promote
...............................................................


  fi
fi

crontab -e -> sudo sh check.sh
sudo chmod 777 check.sh

contineously ping -> if server is down for a fixed amount of time -> send a mail to admin -> delay for a fixed amount of time -> check status -> promote replica as primary