how to auto restart elasticsearch search once crashed on linux server?

Question

Once my elasticsearch crashed on linux server. it gives me following error:

Elasticsearch\Common\Exceptions\NoNodesAvailableException:/var/www/laravel/vendor/elasticsearch/elasticsearch/src/Elasticsearch/ConnectionPool/StaticNoPingConnectionPool.php:51 No alive nodes found in your cluster 

Too resolve this i need to reset full server.

I want solution as my elasticsearch service restart automatically in case on crash.

My server configuration :

Linux name 3.10.0-514.21.1.el7.x86_64 #1 SMP Thu May 25 17:04:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

How can i set something on server which restart my elasticsearch automatically when crashed.?

Answer 1

Step to Auto restart elasticsearch services after crash or down:

1) Edit elasticsearch service unit file using the following command

sudo systemctl edit elasticsearch.service 

This command will create a file

/etc/systemd/system/elasticsearch.service.d/override.conf

2) Now, add the following lines in the unit file.

[Service]
Restart=always

3) Save the file .

ctrl+x  > Y > Enter

4) Refresh the unit file using command

sudo systemctl daemon-reload

5) Can check the changes using command

sudo systemctl cat elasticsearch.service