How to add a docker health check to test a tcp port is open?

Question

I have a server which is running an apache hive service on port 9083. The thing is it doesn't support http protocol (but uses thrift protocol).so I can't simply add

HEALTHCHECK CMD http://127.0.0.1:9083 || exit 1 #  this check fails

All I want is to check if that port is open. I have netstat and curl on server but not nc.

So far I tried the below options, but none of them is suitable as a health check.

netstat -an | grep 9083 | grep LISTEN | echo $?  # This works
netstat -an | grep 9084 | grep LISTEN | echo $? # but so does this

The problem as I interpret from the above is it's simply telling me my syntax is correct, but not really testing if that port is really listening

because when I do netstat -an I get the following output,which clearly shows only 9083 is listening but not 9084

Active Internet connections (servers and established) Proto Recv-Q Send-Q Local  Address           Foreign Address         State tcp       0      0 
 0.0.0.0:9083            0.0.0.0:*               LISTEN tcp    0      0 

Answer 1

Though answering an old question, for future googlers, the following worked for me:

HEALTHCHECK CMD netstat -an | grep 9083 > /dev/null; if [ 0 != $? ]; then exit 1; fi;