Test if Solr is running and restart

Question

I have an script that restarts Solr which I run from cron.:

./restartsolr.sh 
systemctl stop solr
systemctl start solr

How can I add a test to only stop & start solr if solr status is inactive.

Running service solr status when stopped gives:

 solr.service - LSB: Controls Apache Solr as a Service
     Loaded: loaded (/etc/init.d/solr; generated)
     Active: inactive (dead) since Fri 2022-07-08 16:52:14 UTC; 1min 55s ago
       Docs: man:systemd-sysv-generator(8)
    Process: 16432 ExecStart=/etc/init.d/solr start (code=exited, status=0/SUCCESS)
    Process: 16671 ExecStop=/etc/init.d/solr stop (code=exited, status=0/SUCCESS)

So using bash can I write something like

solr_status  = service solr status
if solrstatus.include "dead"
    systemctl stop solr
    systemctl start solr
end

What would the syntax be in bash for that? Is this the best way / an ok way to monitor solr ?

Answer 1

If you really want to check that solr is not active then you can do this result=$(systemctl is-active solr) if [[ $result != active ]]; then systemctl start solr; fi result=$(systemctl is-active solr) if [[ $result != active ]]; then systemctl start solr; fi