How to Auto restart elasticsearch with monit

monit is a program used to monitor processes and restart them if they failed. If your server don’t have monit installed, see install instructions at Install Monit on Ubuntu or Install Monit on CentOS

To restart elasticsearch on failure, create a file

vi /etc/monit/conf-enabled/elasticsearch.conf 

Add the following content to the file

check process elasticsearch with pidfile "/var/run/elasticsearch/elasticsearch.pid"
   start program = "/bin/systemctl start elasticsearch"
   stop  program = "/bin/systemctl stop elasticsearch"

Reload monit with

monit reload

To check the status of monit, run

monit status

Example

root@sok:~# monit status
Monit 5.26.0 uptime: 8m

Process 'elasticsearch'
  status                       OK
  monitoring status            Monitored
  monitoring mode              active
  on reboot                    start
  pid                          366866
  parent pid                   1
  uid                          115
  effective uid                115
  gid                          118
  uptime                       6m
  threads                      60
  children                     1
  cpu                          -
  cpu total                    -
  memory                       58.0% [2.2 GB]
  memory total                 58.2% [2.2 GB]
  security attribute           unconfined
  disk read                    0 B/s [97.5 MB total]
  disk write                   0 B/s [2.3 MB total]
  data collected               Mon, 09 Aug 2021 10:07:22

System 'sok.guest'
  status                       OK
  monitoring status            Monitored
  monitoring mode              active
  on reboot                    start
  load average                 [0.02] [0.18] [0.47]
  cpu                          4.4%us 1.4%sy 0.1%wa
  memory usage                 3.1 GB [81.7%]
  swap usage                   774.5 MB [18.9%]
  uptime                       3d 22h 39m
  boot time                    Thu, 05 Aug 2021 11:28:16
  data collected               Mon, 09 Aug 2021 10:07:22

root@sok:~# 

To see other ways of restarting ElasticSearch, see How to auto restart ElasticSearh service on failure

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