Following the Elasticsearch cluster issues in our ELK stack (mentioned in the previous article Docker logging with GELF using tcp: The good, the bad, the ugly), I got aware that the monitoring plugin check_es_system didn't correctly alert, when ElasticSearch was down on a node.
Today's release is a double-release with two independent improvements.
Version 1.2 fixes issue 6 by verifying that the "-t" (checktype) parameter was defined, which is a mandatory parameter.
Version 1.3 fixes issue 8 (Catch connection refused error). This is actually something essential every monitoring plugin which opens a remote connection should do.
The plugin now correctly throws a CRITICAL error, when the connection cannot be established:
# ./check_es_system.sh -H es02.example.com -t status -u elastic -p secretpass
ES SYSTEM CRITICAL - Failed to connect to es02.example.com port 9200: Connection refused
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