the latest is, that I installed Readonly plugin for kibana. i am done with the patching. Now kibana is not working. systemctl status shows " failed to start". i am attaching logs of kibana and ES. please have a look . Thankyou for your support 
logs.zip (123.6 KB)
Please verify you have set in kibana.yml
readonlyrest_kbn.cookiePass: <random_long_string_32_or_more_characters>
Also, in the same file, make sure you have:
elasticsearch.username: kibana
elasticsearch.password: <some password>
This username and password needs to reflect what’s inside readonlyrest.yml for the kibana server account.
For detailed instruction, see this guide.
thankyou very much. everything working fine now. Just need i help please, after installing readonlyrest , now i can’t see logs of my device.
it has something to do with the authentication i configured with readonlyrest ?
I guess, now you should take a look at:
- the indices rule - to see how restrict access to given indices
- the kibana rule - to see how to restrict access to Kibana dashboards and settings