Certificate validity checker
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Sample nagios configuration:
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define command {
        command_name    check_cert
        command_line    /usr/local/bin/cert-checker -H $HOSTADDRESS$ -s $ARG1$ -w $ARG2$ -c $ARG3$
}

define service {
        hostgroup_name linux-servers
        service_description HTTPS certificate validity checker
        check_command check_cert!443!30!7
        use generic-service
        normal_check_interval 1440
}