1RRDUPDATE(1)                        rrdtool                       RRDUPDATE(1)
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NAME

6       rrdupdate - Store a new set of values into the RRD
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SYNOPSIS

9       rrdtool {update | updatev} filename [--template|-t ds-name[:ds-
10       name]...]  [--skip-past-updates|-s] [--daemon|-d address] [--]
11       N:value[:value]...  timestamp:value[:value]...  at-
12       timestamp@value[:value]...
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DESCRIPTION

15       The update function feeds new data values into an RRD. The data is time
16       aligned (interpolated) according to the properties of the RRD to which
17       the data is written.
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19       updatev This alternate version of update takes the same arguments and
20               performs the same function. The v stands for verbose, which
21               describes the output returned. updatev returns a list of any
22               and all consolidated data points (CDPs) written to disk as a
23               result of the invocation of update. The values are indexed by
24               timestamp (time_t), RRA (consolidation function and PDPs per
25               CDP), and data source (name).  Note that depending on the
26               arguments of the current and previous call to update, the list
27               may have no entries or a large number of entries.
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29               Since updatev requires direct disk access, the --daemon option
30               cannot be used with this command.
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32       filename
33               The name of the RRD you want to update.
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35       --template|-t ds-name[:ds-name]...
36               By default, the update function expects its data input in the
37               order the data sources are defined in the RRD, excluding any
38               COMPUTE data sources (i.e. if the third data source DST is
39               COMPUTE, the third input value will be mapped to the fourth
40               data source in the RRD and so on). This is not very error
41               resistant, as you might be sending the wrong data into an RRD.
42
43               The template switch allows you to specify which data sources
44               you are going to update and in which order. If the data sources
45               specified in the template are not available in the RRD file,
46               the update process will abort with an error message.
47
48               While it appears possible with the template switch to update
49               data sources asynchronously, RRDtool implicitly assigns non-
50               COMPUTE data sources missing from the template the *UNKNOWN*
51               value.
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53               Do not specify a value for a COMPUTE DST in the update
54               function. If this is done accidentally (and this can only be
55               done using the template switch), RRDtool will ignore the value
56               specified for the COMPUTE DST.
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58               The caching daemon rrdcached cannot be used together with
59               templates yet.
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61       --skip-past-updates|-s
62               When updating an rrd file with data earlier than the latest
63               update already applied, rrdtool will issue an error message and
64               abort. This option instructs rrdtool to silently skip such
65               data. It can be useful when re-playing old data into an rrd
66               file and you are not sure how many updates have already been
67               applied.
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69       --daemon|-d address
70               If given, RRDtool will try to connect to the caching daemon
71               rrdcached at address. If the connection is successfully
72               established the values will be sent to the daemon instead of
73               accessing the files directly. If the connection cannot be
74               established it will fall back to direct file-access.  While
75               this is convenient, it can silently create problems so please
76               read the warning in the examples.
77
78               For a list of accepted formats, see the -l option in the
79               rrdcached manual.
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81       {N | timestamp}:value[:value]...
82               The data used for updating the RRD was acquired at a certain
83               time. This time can either be defined in seconds since
84               1970-01-01 or by using the letter 'N', in which case the update
85               time is set to be the current time. Negative time values are
86               subtracted from the current time. An AT_STYLE TIME
87               SPECIFICATION (see the rrdfetch documentation) may also be used
88               by delimiting the end of the time specification with the '@'
89               character instead of a ':'. Getting the timing right to the
90               second is especially important when you are working with data-
91               sources of type COUNTER, DERIVE, DCOUNTER, DDERIVE or ABSOLUTE.
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93               When using negative time values, options and data have to be
94               separated by two dashes (--), else the time value would be
95               parsed as an option.  See below for an example.
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97               The remaining elements of the argument are DS updates. The
98               order of this list is the same as the order the data sources
99               were defined in the RRA. If there is no data for a certain
100               data-source, the letter U (e.g., N:0.1:U:1) can be specified.
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102               The format of the value acquired from the data source is
103               dependent on the data source type chosen. Normally it will be
104               numeric, but the data acquisition modules may impose their very
105               own parsing of this parameter as long as the colon (:) remains
106               the data source value separator.
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ENVIRONMENT VARIABLES

109       The following environment variables may be used to change the behavior
110       of "rrdtool update":
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112       RRDCACHED_ADDRESS
113           If this environment variable is set it will have the same effect as
114           specifying the "--daemon" option on the command line. If both are
115           present, the command line argument takes precedence.
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117       RRDCACHED_STRIPPATH
118           If this environment variable is set it will strip the leading
119           string from the filename prior to sending the filename to
120           rrdcached.  This is mostly intended to allow rrdcached to work with
121           xymon and cacti tools without having to modify those tools.
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EXAMPLES

124       ·   "rrdtool update demo1.rrd N:3.44:3.15:U:23"
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126           Update the database file demo1.rrd with 3 known and one *UNKNOWN*
127           value. Use the current time as the update time.
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129       ·   "rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7"
130
131           Update the database file demo2.rrd which expects data from a single
132           data-source, three times. First with an *UNKNOWN* value then with
133           two regular readings. The update interval seems to be around 300
134           seconds.
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136       ·   "rrdtool update demo3.rrd -- -5:21 N:42"
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138           Update the database file demo3.rrd two times, using five seconds in
139           the past and the current time as the update times.
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141       ·   "rrdtool update --daemon unix:/tmp/rrdd.sock demo4.rrd N:23"
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143           Use the UNIX domain socket "/tmp/rrdd.sock" to contact the caching
144           daemon. If the caching daemon is not available, update the file
145           "demo4.rrd" directly.  WARNING: Since a relative path is specified,
146           the following disturbing effect may occur: If the daemon is
147           available, the file relative to the working directory of the daemon
148           is used. If the daemon is not available, the file relative to the
149           current working directory of the invoking process is used.  This
150           may update two different files depending on whether the daemon
151           could be reached or not. Don't do relative paths, kids!
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AUTHORS

154       Tobias Oetiker <tobi@oetiker.ch>, Florian Forster
155       <octo at verplant.org>
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1591.7.1                             2019-02-04                      RRDUPDATE(1)
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