DHCPD-POOLS(1) User Commands DHCPD-POOLS(1) NAME dhcpd-pools - ISC dhcpd pools usage analysis SYNOPSIS dhcpd-pools [--config file] [--leases file] [--sort nimcptTe] [--reverse] [--format tHcxXjJ] [--mustach template] [--output file] [--limit nr] [--color when] [--warning percent] [--critical percent] [--warn-count number] [--crit-count number] [--snet-alarms] [--minsize size] [--perfdata] [--version] [--help] DESCRIPTION The program analyses ISC dhcpd shared network and pool usage and outputs the results in a format selected by user. OUTPUT FIELDS shared net name Name of the shared-network for the range. first ip First IP in lease pool range. last ip Last IP in lease pool range. max Number of IPs which exist in a pool, shared network or all together. cur Number of leases currently in use. percent Percent of IPs currently in use compared to max. touch Number of IP's which appear in the lease file, but who's leases have expired. A touched IP is either expired or abandoned. The touched IP count is somewhat misleading when you try to determine if an IP pool is big enough; it is a better indicator of whether a pool is too large. t+c The sum of Touched and Currently in-use leases. t+c perc Percent of IPs either touched or currently in use, compared to max. bu Failover pair can allocate these addresses. The count appears only if there is failover configuration. bu perc Percent of addresses that failover pair can allocate. The percent appears only if there is failover configuration. OPTIONS -c, --config=FILE Path to the dhcpd.conf file. If the dhcpd.conf has include files they can be analysed separately, that can be useful when trying to understand or monitor subset of data. -l, --leases=FILE Path to the dhcpd.leases file. -s, --sort=[nimcptTe] Sort ranges by chosen fields as a sorting keys. Keys weight from left to right, i.e., if more weighting keys are equal next one is used. The IP field is default sort key. -r, --reverse Sort results in reverse order. -f, --format=[tHcxXjJ] Output format. Text (t). Full-html (H) page output. In html page critical and warning thresholds can be visualized with --color=al- ways option. The (c) stands for comma-separated values. Output format xml (x) is similar to the dhcpstatus Perl module output. The extended xml (X) format will print ethernet address details. The (j) will output in json format, which can be extended with (J) to include ethernet address. The default format is text. --mustach=TEMPLATE Output using mustach template file. This is useful when the native output formats controlled with --format option do not provide what you need. See below example mustach template that is using all available {{tags}} to demonstrate what can be displayed and how. /usr/local/bin/dhcpd-pools --config /usr/local/share/doc/dhcpd- pools/dhcpd.conf --leases /usr/local/share/doc/dhcpd- pools/dhcpd.leases --mustach /usr/local/share/doc/dhcpd-pools/mus- tach.template -o, --output=FILE File where output is written. Default is stdout. -L, --limit=NR The NR will limit what will be printed. Syntax is similar to chmod(1) permission string. The NR limit string uses two digits which vary between 0 to 7. The first digit determines which headers to display, and the second digit determines which numeric analysis tables to include in the output. The following values are "OR'd" together to create the desired output. The default is 77. 01 Print ranges 02 Print shared networks 04 Print total summary 10 Print range header 20 Print shared network header 40 Print total summary header The output limit for total summary has special meaning in --warning and --critical alarming context. When the alarming is in use, and total is not wanted to be seen then in the case of alarming return- ing success nothing is printed. --color=when Use yellow for warning, red for critical, green for suppressed by --minsize and blue when --snet-alarms is the cause of suppression or shared network does not have any ranges. The when string can be al- ways, never, or auto. Default is auto, that uses colors when com- mand is running in interactive terminal. With use of --warning or --critical coloring thresholds can be changed, but one must also use --format=text to avoid turning on alarting mode. --skip=when The when can be one of the following: ok, warning, critical, min- size, or suppressed. The skipping criteria is exact match with col- ors in --color option. --warning=percent Turn on alarm output format, and specify percentage number which will cause an alarm. If either a range or shared network will ex- ceed warning level return value of the command is 1. If only range monitoring is needed one can use limit option for scoping, for exam- ple -L10. To monitor shared network only the limit would be -L20. If warning percentage is not specified it defaults to 80. The per- cent argument allows fractions, e.g., 88.8, to be used. --critical=percent The option is similar to warning, with exception of return value which is 2. If critical percentage is not specified it defaults to 90. --warn-count=number A number of free leases before alarm is raised. When specified both --warning percent and count number are required to be exceeded in order to alarm criteria being fulfilled. This option is intended to be used in setup where very large and small shared-networks and ranges co-exists. In such environments percent based alarming can lead to either flood of alarms about small ranges, or way too great overhead of free addresses in large shared-networks. Suggested usage is to set percentage to a level that makes small ranges to ring, and set the count to match level when an enormous shared-network is too few free leases. Defaults to 2^32, that is size of entire IPv4 address space. --crit-count=number Same as --warn-count, but for critical alarms. --snet-alarms Suppress range alarms that are part of shared networks. Use of this option will keep alarm criteria applied to ranges that are not part of shared-net along with shared-net alarms. This option may help reducing alarm noise for configurations that has lots of small ranges in big shared-networks. --minsize=size Ignore ranges and shared networks that are smaller or equal to the defined size. This option is meaningful only in context of alarm- ing, and will intended to suppress for example single host ranges. By default this option is not in use. -p, --perfdata Print additional performance data, like lease count, touched leases and backup leases. This option is meaningful only in context of alarming and will print lots of data, if there are many networks. By default this option is not in use. -A, --all-as-shared Treat all stand-alone subnets as shared-network with named formed from it's CIDR. By default this option is not in use for backwards compatibility. --ip-version=4|6 Force command to read configuration and leases files in IPv4 or IPv6 mode. Notice that when inputs do not match with what is forced analysis output is garbage. This option should not be necessary to use, and exists only to allow debugging. -v, --version Print version information to standard output and exit successfully. -h, --help Print help to standard output and exit successfully. EXAMPLES Print ranges header, and analysis. $ dhcpd-pools -L 11 -c dhcpd.conf -l dhcpd.leases Ranges: shared net name [...] Print shared networks and totals, both headers and results $ dhcpd-pools -L 66 -c dhcpd.conf -l dhcpd.leases shared net name [...] Alarming $ dhcpd-pools -c dhcpd.conf -l dhcpd.leases --critical 80.1 --warn- ing 75 CRITICAL: dhcpd-pools: Ranges; crit: 14 warn: 22 ok: 220 Shared nets; crit: 1 warn: 0 ok: 4 $ dhcpd-pools -c dhcpd.conf -l dhcpd.leases -L 22 --critical 70 --warning 50 [no-output] Suppress printing OK, and make alarm only to go off if shared net- works exceed critial or warning levels. FILES /usr/local/etc/dhcpd.conf ISC dhcpd configuration file. /var/db/dhcpd/dhcpd.leases ISC dhcpd lease file. /usr/local/share/doc/dhcpd-pools/prometheus.template Prometheus text file collector mustach template. AUTHORS Original design by Sami Kerola. uthash by Troy D. Hanson. XML support by Dominic Germain, Sogetel inc. IPv6 support by Cheer Xiao. Mustache templating support by JosA(C) Bollo. LICENSE The dhcpd-pools uses FreeBSD License, uthash uses BSD license, the mustache uses Apache License, and the gnulib modules are mostly, but not entirely, GPL. REPORTING BUGS Report bugs to Sami Kerola Home page SEE ALSO dhcpd.leases(5), dhcpd.conf(5), chmod(1), https://mustache.github.io/ 3.2 2017-11-15 DHCPD-POOLS(1)
NAME | SYNOPSIS | DESCRIPTION | OUTPUT FIELDS | OPTIONS | EXAMPLES | FILES | AUTHORS | LICENSE | REPORTING BUGS | SEE ALSO
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