check Hadoop datanodes

Perl script to check the number of Hadoop datanodes alive useage: Nagios Configuration services.cfg define service { use generic-service host_name [namenode's host] service_description check_remote_datanode contact_groups admins check_command check_remote_datanode!15!13 } above example says that: check_remote_datanode returns 1 ("WARNING") if the number of datanodes alive is equal or less than 15 2 ("CRITICAL") if the number of datanodes alive is equal or less than 13 0 ("OK") if the number of datanodes alive is more than 15 commands.cfg define command { command_name check_remote_datanode command_line /usr/local/bin/check_hadoop_datanode.pl $HOSTADDRESS$ $ARG1$ $ARG2$ }

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