RRDUPDATE(1) rrdtool RRDUPDATE(1) NNAAMMEE rrdupdate - Store a new set of values into the RRD SSYYNNOOPPSSIISS rrrrddttooooll {uuppddaattee | uuppddaatteevv} _f_i_l_e_n_a_m_e [----tteemmppllaattee|--tt _d_s_-_n_a_m_e[::_d_s_- _n_a_m_e]...] [----ddaaeemmoonn _a_d_d_r_e_s_s] [----] NN|_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...] _a_t_- _t_i_m_e_s_t_a_m_p@@_v_a_l_u_e[::_v_a_l_u_e...] [_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...] ...] DDEESSCCRRIIPPTTIIOONN The uuppddaattee function feeds new data values into an RRRRDD. The data is time aligned (interpolated) according to the properties of the RRRRDD to which the data is written. uuppddaatteevv This alternate version of uuppddaattee takes the same arguments and performs the same function. The _v stands for _v_e_r_b_o_s_e, which describes the output returned. uuppddaatteevv returns a list of any and all consolidated data points (CDPs) written to disk as a result of the invocation of update. The values are indexed by timestamp (time_t), RRA (consolidation function and PDPs per CDP), and data source (name). Note that depending on the arguments of the current and previous call to update, the list may have no entries or a large number of entries. Since uuppddaatteevv requires direct disk access, the ----ddaaeemmoonn option cannot be used with this command. _f_i_l_e_n_a_m_e The name of the RRRRDD you want to update. ----tteemmppllaattee|--tt _d_s_-_n_a_m_e[::_d_s_-_n_a_m_e]... By default, the uuppddaattee function expects its data input in the order the data sources are defined in the RRD, excluding any COMPUTE data sources (i.e. if the third data source DDSSTT is COMPUTE, the third input value will be mapped to the fourth data source in the RRRRDD and so on). This is not very error resistant, as you might be sending the wrong data into an RRD. The template switch allows you to specify which data sources you are going to update and in which order. If the data sources specified in the template are not available in the RRD file, the update process will abort with an error message. While it appears possible with the template switch to update data sources asynchronously, RRRRDDttooooll implicitly assigns non- COMPUTE data sources missing from the template the _*_U_N_K_N_O_W_N_* value. Do not specify a value for a COMPUTE DDSSTT in the uuppddaattee function. If this is done accidentally (and this can only be done using the template switch), RRRRDDttooooll will ignore the value specified for the COMPUTE DDSSTT. ----ddaaeemmoonn _a_d_d_r_e_s_s If given, RRRRDDTTooooll will try to connect to the caching daemon rrdcached at _a_d_d_r_e_s_s and will fail if the connection cannot be established. If the connection is successfully established the values will be sent to the daemon instead of accessing the files directly. For a list of accepted formats, see the --ll option in the rrdcached manual. NN|_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...] The data used for updating the RRD was acquired at a certain time. This time can either be defined in seconds since 1970-01-01 or by using the letter 'N', in which case the update time is set to be the current time. Negative time values are subtracted from the current time. An AT_STYLE TIME SPECIFICATION (see the _r_r_d_f_e_t_c_h documentation) may also be used by delimiting the end of the time specification with the '@' character instead of a ':'. Getting the timing right to the second is especially important when you are working with data- sources of type CCOOUUNNTTEERR, DDEERRIIVVEE or AABBSSOOLLUUTTEE. When using negative time values, options and data have to be separated by two dashes (----), else the time value would be parsed as an option. See below for an example. When using negative time values, options and data have to be separated by two dashes (----), else the time value would be parsed as an option. See below for an example. The remaining elements of the argument are DS updates. The order of this list is the same as the order the data sources were defined in the RRA. If there is no data for a certain data-source, the letter UU (e.g., N:0.1:U:1) can be specified. The format of the value acquired from the data source is dependent on the data source type chosen. Normally it will be numeric, but the data acquisition modules may impose their very own parsing of this parameter as long as the colon (::) remains the data source value separator. EENNVVIIRROONNMMEENNTT VVAARRIIAABBLLEESS The following environment variables may be used to change the behavior of "rrdtool update": RRRRDDCCAACCHHEEDD__AADDDDRREESSSS If this environment variable is set it will have the same effect as specifying the "--daemon" option on the command line. If both are present, the command line argument takes precedence. EEXXAAMMPPLLEESS · "rrdtool update demo1.rrd N:3.44:3.15:U:23" Update the database file demo1.rrd with 3 known and one _*_U_N_K_N_O_W_N_* value. Use the current time as the update time. · "rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7" Update the database file demo2.rrd which expects data from a single data-source, three times. First with an _*_U_N_K_N_O_W_N_* value then with two regular readings. The update interval seems to be around 300 seconds. · "rrdtool update demo3.rrd -- -5:21 N:42" Update the database file demo3.rrd two times, using five seconds in the past and the current time as the update times. · "rrdtool update --cache /var/lib/rrd/demo3.rrd N:42" Update the file "/var/lib/rrd/demo3.rrd" with a single data source, using the current time. If the caching daemon cannot be reached, do nnoott fall back to direct file access. · "rrdtool update --daemon unix:/tmp/rrdd.sock demo4.rrd N:23" Use the UNIX domain socket "/tmp/rrdd.sock" to contact the caching daemon. If the caching daemon is not available, update the file "demo4.rrd" directly. WWAARRNNIINNGG:: Since a relative path is specified, the following disturbing effect may occur: If the daemon is available, the file relative to the working directory ooff tthhee ddaaeemmoonn is used. If the daemon is not available, the file relative to the current working directory of the invoking process is used. TThhiiss mmaayy uuppddaattee ttwwoo ddiiffffeerreenntt ffiilleess ddeeppeennddiinngg oonn wwhheetthheerr tthhee ddaaeemmoonn ccoouulldd bbee rreeaacchheedd oorr nnoott.. Don't do relative paths, kids! AAUUTTHHOORRSS Tobias Oetiker , Florian Forster 1.4.8 2013-05-23 RRDUPDATE(1)