Check for SMTP connection.
check-smtp -H smtp.example.com -p 25 -w 3 -c 5 -t 10
First, build this program.
go get github.com/mackerelio/go-check-plugins
cd $(go env GOPATH)/src/github.com/mackerelio/go-check-plugins/check-smtp
go install
Or you can use this program by installing the official Mackerel package. See Using the official check plugin pack for check monitoring - Mackerel Docs.
Next, you can execute this program :-)
check-smtp -H smtp.example.com -p 25 -w 3 -c 5 -t 10
If there are no problems in the execution result, add a setting in mackerel-agent.conf .
[plugin.checks.check-smtp-sample]
command = ["check-smtp", "-H", "smtp.example.com", "-p", "25", "-w", "3", "-c", "5", "-t", "10"]
-H, --host= Hostname (default: localhost)
-p, --port= Port (default: 25)
-F, --fqdn= FQDN used for HELO
-s, --smtps Use SMTP over TLS
-S, --starttls Use STARTTLS
-A, --authmech= SMTP AUTH Authentication Mechanisms (only PLAIN supported)
-U, --authuser= SMTP AUTH username
-P, --authpassword= SMTP AUTH password
-w, --warning= Warning threshold (sec)
-c, --critical= Critical threshold (sec)
-t, --timeout= Timeout (sec) (default: 10)
Please execute check-smtp -h
and you can get command line options.