Hey all,
I wrote a very basic script to determine if cassandra db is running. I'm setting a variable called 'pid' to the output of a ps | grep like to grab the pid of the cassandra process.
#!/bin/bash pid=$(ps -ef | grep cassandra | grep -v grep | grep -i -v -e grep -e screen -e s3fs|awk '{print $2}')
if [[ -e $pid ]] then echo "Cassandra is running with pid: $pid" else echo "Cassandra is DOWN!!!" fi
But for some reason the script doesn't realize that the pid variable has been set, and fails the condition. It then reports that Cassnadra is DOWN!!!".
[root@web1:~] #sh -x ./bin/check-cass.sh ++ ps -ef ++ grep -v grep ++ grep -i -v -e grep -e screen -e s3fs ++ awk '{print $2}' ++ grep cassandra + pid=26979 + [[ -e 26979 ]] + echo 'Cassandra is DOWN!!!' Cassandra is DOWN!!!
Can anybody tell me where I'm going wrong here? Because from what I can see, clearly the pid variable is being set so the script should be reporting that cassandra is up!
I'd appreciate any advice you may have.
Thanks, Tim