Troubleshooting

Note :

• Nagios gives you details about which service is down 

• Based on which service is down you troubleshoot based using below methods

Service Running

• Run this command "sudo service [service-name] status"

• if the response is "[service-name] is not running". Just restart the server by running " sudo service [service-name] restart"

Disk Space Check 

• Run this command  "df -ah"

• Will list down all the file system disk usage space 

• Check for the file system who usage is more than 90%

• Then delete the files which are not required in the location where usage is more.

• Then restart the  server by running " sudo service [service-name] restart"

Cassandra  PID file dead 

• Run this command "sudo service cassandra status" and you get response as "Output:Cassandra dead but pid file exists."

• Remove the dead pid file by running the command "rm /var/run/cassandra/cassandra.pid"