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/usr/local/nagios/libexec/check_dns -h
check_dns v2.2.1 (nagios-plugins 2.2.1)
Copyright (c) 1999 Ethan Galstad <[email protected]>
Copyright (c) 2000-2014 Nagios Plugin Development Team
        <[email protected]>

This plugin uses the nslookup program to obtain the IP address for the given host/domain query.
An optional DNS server to use may be specified.
If no DNS server is specified, the default server(s) specified in /etc/resolv.conf will be used.


Usage:
check_dns -H host [-s server] [-q type ] [-a expected-address] [-A] [-n] [-t timeout] [-w warn] [-c crit]

Options:
 -h, --help
    Print detailed help screen
 -V, --version
    Print version information
 --extra-opts=[section][@file]
    Read options from an ini file. See
    https://www.nagios-plugins.org/doc/extra-opts.html
    for usage and examples.
 -H, --hostname=HOST
    The name or address you want to query
 -s, --server=HOST
    Optional DNS server you want to use for the lookup
 -q, --querytype=TYPE
    Optional DNS record query type where TYPE =(A, AAAA, SRV, TXT, MX, ANY)
    The default query type is 'A' (IPv4 host entry)
 -a, --expected-address=IP-ADDRESS|HOST
    Optional IP-ADDRESS you expect the DNS server to return. HOST must end with
    a dot (.). This option can be repeated multiple times (Returns OK if any
    value match). If multiple addresses are returned at once, you have to match
    the whole string of addresses separated with commas (sorted alphabetically).
    If you would like to test for the presence of a cname, combine with -n param.
 -A, --expect-authority
    Optionally expect the DNS server to be authoritative for the lookup
 -n, --accept-cname
    Optionally accept cname responses as a valid result to a query
    The default is to ignore cname responses as part of the result
 -w, --warning=seconds
    Return warning if elapsed time exceeds value. Default off
 -c, --critical=seconds
    Return critical if elapsed time exceeds value. Default off
 -t, --timeout=INTEGER:<timeout state>
    Seconds before connection times out (default: 10)
    Optional ":<timeout state>" can be a state integer (0,1,2,3) or a state STRING