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Skip to content. a full date in several numerical formats, including MM/DD/[ YY ]YY, DD .MM. The last value is the average of the two measurements 66.7 and 68.2. last, lastupdate, first, info, fetch, tune, resize, xport RRDtool is distributed under the Terms of the GNU General Public License Version 2. NOTE2: if you specify day this way, the time-of-day is [ YY ]YY, or AT-STYLE right after the) years, months, weeks, or days it is assumed to mean months, while in the context of hours, tune Alter setup and structure of an RRD. Currently, if the Check rrdrestore fetch Get data for a certain time period from a RRD. When setting up an Round Robin Database ( RRD ), you can define at which interval this consolidation should occur, and what consolidation function ( CF ) (average, minimum, maximum, total, last) should be used to build the consolidated values (see rrdcreate). You can rate examples to help us improve the quality of examples. by applying the following two heuristics: If m is used in context of (i.e. specification is called ``at-style'' after Unix command at(1) the consolidation function that is applied to the data you want to fetch (AVERAGE,MIN,MAX,LAST) --resolution | -r resolution (default is the highest resolution) the interval you want the values to have (seconds per value). which consolidation function should have been applied to the data you want to fetch? See also They are at 1m intervals. these include midnight (00:00), noon (12:00) and British is m. To disambiguate, the parser tries to read your mind :) Use code METACPAN10 at checkout to apply your discount. SPECIFICATION section for a detailed explanation of how to specify end time. Now refers to the current moment (and is also a default time reference). In this case you should either quote the whole phrase to prevent it from ... GPIO.OUT) # Fetch the last 10 readings in the rrdfile. rrdtool fetch AVERAGE. NOTE2 : if you specify the day in this way, the time-of-day is REQUIRED as well. Month and weekday names can be used in their naturally abbreviated form Check rrdfetch. rrdtool fetch filename CF The (after mktime(3) normalization); in the OFFSET specification. Check rrdtune. hope that mktime(3) will take care of this later). Graph available for download also didnt not show any info, with script to check provided. The day can be specified as month-name day-of-the-month and optional a 2- or 4-digit year number (e.g. RRD4J supports all standard operations on Round Robin Database (RRD) files: CREATE, UPDATE, FETCH, LAST, DUMP, EXPORT and GRAPH. The lastupdate function returns the UNIX timestamp and the value stored for each datum in the most recent update of an RRD. months, or years as your time offset units your time reference date is right after the + or - sign) the meaning of m is guessed from the number it directly follows. It consists of sign RRD and try to retrieve the data in the resolution requested. These are the top rated real world PHP examples of rrd_fetch extracted from open source projects. But I cannot file any similarities if I compare it with the data of log file (the graphs are same). In contrast, hours, minutes, and seconds are well defined time intervals, and these are guaranteed to always produce time offsets exactly as specified (e.g. If you find NaN's there, perform. Development note: The current implementation fetches all values from the RRA in one swoop and caches them in memory. March 8 1999). absolute value is below 25 it is assumed that m means months, otherwise it is treated as minutes. fetch will analyze the RRD and will try to retrieve the data in the resolution requested. 12/31/99 11:59pm -- 1 minute to the year 2000 for imperialists. anything about it (in the hope that mktime(3) will take care that has moderately complex ways to specify time to run your job at. printf function. The time-of-day can be specified as HH:MM , HH .MM, or just HH . NOTE4 : The single-letter abbreviation for both months and minutes is m. To disambiguate them, the parser tries I need convert numbers In, Out in Mbps/s I found this command with awk, but a want in shell Ex: The day can be specified as month-name day-of-the-month RRDtool will try to give you the best available data, but e.g. The words now, '8:00 Mar 27 1999 +48 hours' = '9:00 Mar 29 1999', as expected). The fetch function is normally used internally by the graph function, to get data end-3weeks or e-3w -- 3 weeks before end time (may be used as start time specification). start+6hours or s+6h -- 6 hours after start time (may be used as end time specification). match is possible. You might try rrdtool fetch subdata.rrd AVERAGE -r 900 -s -1h However, this will almost always result in a time series that is NOT in the 15 minute RRA. If a single update is missing and the next one occurs in less than 600 seconds from the last one, rrdtool will interpolate the missing update. [--end|-e end]. 'May 31 -1month' = 'Apr 31' (meaningless) = 'May 1' moment in time (for time offset to be applied to). if you have fine grained data for the last week and you ask for data in the last ten days, you’ll hit a different RRA (if available). The last measurement of 70.4 is lost. When I generate a graph for weekly, the value is 4 but when I generate for monthly, the value is about 2.1. (e.g., -25m == -25 minutes, (+ or -) and amount. Last active Aug 11, 2020. Yet when I do a graph/fetch, I'm getting NaNs for the last two columns. Thanks, Some special times of day are understood as well, including midnight (00:00), noon (12:00) and But what if you really would like to know the highest (or lowest) rate seen? Currently, if the number (e.g., Dec for December, Sun for Sunday, etc.). which also count as whitespace (e.g., midnight_Thu or midnight,Thu), -1month or -1m -- current time of day, only a month before (may yield surprises, see the This might change in the future, to cache only the last timestamp and keep fetching from the RRD with every fetch_next () call. The When present, it should After some research I found rrdtool: "round robin database tool". what interval should the values have (seconds per value). adjustments take place). SPECIFICATION section for a detailed explanation on ways to specify start time. Alternatively, you can use day-of-week-name (e.g. The archive that keeps averages will show low numbers, the archive that shows maxima will have higher numbers. NOTE1 : this is different from the original at(1) behavior, where a single-number date is interpreted as MMDD[ *UNKNOWN* data is often You may not be familiar with the term RRD graph, but if I show you one, you probably recognize them instantaneously. It seems that whatever you do to the data, and the measurement times, the first value in the database is always going to the the first measurement. -1month or -1m -- current time of day, only a month before (may yield surprises, see NOTE3 above). PHP rrd_fetch - 13 examples found. Negative numbers are relative to the current time. To cope with this, when you use days, weeks, +48 hours' = '9:00 Mar 29 1999', as expected). when should the data end. YYYYMMDD . last(*args) Get the UNIX timestamp of the most recent data sample in an RRD. This may lead to some surprising (or even invalid!) To do this, you have to first write a fetch function in perl, and then register: this function using C< RRDs::fetch_register_callback >. With a bit of Cacti tweaking that seems to work quite well but I encountered a relatively small problem. '8:00 Mar 29 1999', but since there is 1-hour long, and even 1 day may be not equal to 24 hours twice a year, when DST-related clock adjustments take place). Hi Tobi Oetiker, I use 'rrdtool fetch xxx.xxx.xxx.xxx_gi0_x.xxxx.rrd AVERAGE -r 300 -s -900' to get last 3,4 5 minutes in/out usage records from rrd file. You might try rrdtool fetch subdata.rrd AVERAGE -r 900 -s -1h However, this will almost always result in a time series that is NOT in the 15 minute RRA. They are used to plot all kind of data against time in a very easy way which is why they are used a lot in all kind of applications. dizeee / rrd-last-value. Monday), or one of the words: yesterday, today, tomorrow. 23:59 31.12.1999 -- 1 minute to the year 2000. or to a single letter (e.g. noon yesterday -3hours -- yesterday morning; can also be specified as 9am-1day. being taken apart by your shell or use '_' (underscore) or ',' (comma) The following shell command and PHP excerpt both perform the same task. The fetch function is normally used internally by the graph function to get data from RRD s. fetch will analyze the You can also specify the day as EET timezone, Start (end) can be used to specify a time relative to the start (end) time for those tools that use these categories the name of the RRD you want to fetch the data from. You will need to store those as well. time reference, because all those time units have no single well defined time interval value (1 year contains either 365 or 366 days, 1 month is 28 to 31 days DST forward clock adjustment, see the below example). for months, or years as your time offset units your time reference date is adjusted accordingly without too much further effort to ensure anything about it (in the MMDD[YY]YY) (NOTE1: this is different from the original at(1) behavior, which interprets a single-number date as (Sunday) which is an invalid time/date combination (because of 3am -> 4am DST forward clock adjustment, see the below example). Our RRD will include 2 RRA — for last 24 hours and last 31 day. etc. default time reference). The words now, start, end can be abbreviated as n, s, e. NOTE3 : If you specify time offset in days, weeks, months, or years, you will end with the time offset that may vary depending on your I love this ...), --resolution|-r resolution (default is the highest resolution). On the other hand, hours, minutes, and seconds are well defined time intervals, and these are guaranteed to always produce time offsets exactly as specified (e.g. Time reference specification is used, well,... to establish a reference '8:00 Mar 27 1999 +2 days' = rrdfetch will try to match your request, but it will return data even if no absolute match is possible. hours, minutes, seconds, these can be used in singular or plural form, and abbreviated naturally This function has same result as rrd_graph (), but fetched data are returned as array, no image file is … By default one day worth of data will be fetched. Similarly for minimum, average and last. DST forward clock adjustment takes place around 3:00 Mar 28 1999, the actual time interval between In the last database we have created, there are two archives that keep data per day. British teatime (16:00). fetched is printed to stdout. Check rrdfirst. You can suffix it RRDtool does not see those, it is to let RRDtool see the part between quotes as one parameter, not 4 as it would normally show up. 1) download cmon1-1.20. Month and day of the week names can be used in their naturally abbreviated form (e.g., Dec for December, Sun for Sunday, etc.). The following time units can be used to specify the amount: years, months, weeks, days, rrdfetch will try to match your request, but it will return data even if no absolute adjusted accordingly without taking too much further effort to ensure Alternatively, to read your mind :) by applying the following two heuristics: If m is used in context of (i.e. REQUIRED to be present. (meaningless) = 'May 1' (after mktime(3) normalization); in the EET timezone '3:30am Mar 29 1999 -1 day' yields '3:30am Mar 28 1999' rrdtool info says the DS got known values for the last two columns (ext_temperature, ext_humidity). ... upgrade to newer version of rrdtool (it works with rrdtool 1.4.3), but there may be a font package that are missing? Easily Export RRD files into the CSV format. I try to fetch the data and the value is 4. data is the same when fetching with the timestamp for a week/month Weekly Monthly See the rrdtool fetch manual page for details. (AVERAGE,MIN,MAX,LAST). If the result is a negative number, it needs to compensate for the counter rollover. required (e.g., 'midnight Thu'). Therefore, the resolution == 900. you can use day-of-week-name (e.g. at-style specification consists of two parts: TIME REFERENCE specification and TIME EET timezone '3:30am Mar 29 1999 -1 day' yields '3:30am Mar 28 1999' (Sunday) which is invalid time/date combination (because of 3am -> 4am If you tell RRDtool to remember maximum rates, you can use the RRA with the maximum CF to fetch those rates. You can also specify day as a full date in several numerical formats; these include: MM/DD/[YY]YY, DD.MM. start, end can be abbreviated to n, s, e. Time offset specification is used to add (or subtract) certain time I’m setting up weather maps to depict the number of BGP prefixes that route reflectors are announcing. You might try, both start and end time are a multiple of 900, both start and end time are within the desired RRA. Finally, you can use the words now, start, or end as your time reference. To calculate a rate, RRDTool subtracts the last value from the current and divides by the measurement step (or sampling rate) to obtain the rate figure. This may lead to some surprising (or even invalid!) code for handling the data requests from graph, xport and fetch. 'May 31 -1month' = 'Apr 31' concatenated (e.g., -5h45min = -5h-45min = -6h+15min = -7h+1h30m-15min, Get a last value stored in rrd file within the rrdtool in CLI - rrd-last-value. ... >>> for i in rrdtool.fetch('interface.rrd', 'AVERAGE'): print i As a valued partner and proud supporter of MetaCPAN, StickerYou is happy to offer a 10% discount on all Custom Stickers, Business Labels, Roll Labels, Vinyl Lettering or Custom Decals. rrdtool offers a solution to this of this problem through its data consolidation feature. the name of the RRD you want to fetch the data from. The data (e.g., -25m == -25 minutes, while +24m == +24 months), Final NOTES: Time specification is case-insensitive. interval to (from) the time reference moment. for minutes). the consolidation function that is applied to the data you want to fetch ( AVERAGE ,MIN,MAX,LAST), Consider now that you want to fetch the 15 minute average data for the last hour. Consider now that you want to fetch the 15 minute average data for the last hour. Hello! results, e.g. combined together (e.g., -5mon1w2d), as well as several time offsets can be or omitted altogether, there are, however, cases when whitespace is 931225537 -- 18:45 July 5th, 1999 (yes, seconds since 1970 are valid as well). the consolidation function that is applied to the data you want to fetch (AVERAGE,MIN,MAX,LAST) --resolution | -r resolution (default is the highest resolution) the interval you want the values to have (seconds per value). fetch will analyze the RRD and will try to retrieve the data in the resolution requested. The few special times of day are understood as well, and look at the last 10-20 lines. Finally, you can use words now, start, or end as your time reference. TIME 19970703 12:45 -- 12:45 July 3th, 1997 (my favorite, and its even got an ISO number (8601)). [YY]YY, YYYYMMDD (e.g., in -1y6m or +3w1m m means months, while in -3h20m or +5s2m m means minutes), Out of context (i.e. The data fetched is printed to stdout. [--end|-e end]. tools that use these categories (rrdfetch, rrdgraph). number's absolute value is below 25 it is assumed that m means months, otherwise it is treated as minutes. The graph function uses fetch to retrieve its data from an RRD. See also Just create another RRA in your RRD, with the CF you desire. with am or pm or use 24-hours clock. Out of context (i.e. *UNKNOWN* data is often represented by the string ``NaN'' depending on your OSs printf function. This is a really neat utility that you can use to create and populate files that store a timeseries of data. (AVERAGE,MIN,MAX,LAST) teatime (16:00). March 8 1999). Apart from the traditional Seconds since epoch, rrdtool does also understand at-style time specification. This means, that our first archive, which will store data for last 24 hours, will consist of 288 rows and every new value will be added to database immediately. which consolidation function should have been applied to the data you want to fetch? NOTE4: The single-letter abbreviation for both months and minutes while +24m == +24 months). StickerYou.com is your one-stop shop to make your business stick. Several time units can be As HH: MM, HH.MM, or just HH last 24 hours and last 31 day, )! Day, only a month before ( may yield surprises, see NOTE3 above ), array $ ). The last database we have created, there are two archives that keep data per day valid as well the... Of time-of-day reference ( which should come first, if the result is a really neat utility you!, array $ options ): array Gets data for the last update time of day, a... ) is required as well create another RRA in one swoop and caches them in memory a timeseries of will! To Get data for graph output from RRD database file as array and rrd.fetch return findings..., rrdtool does also understand AT-STYLE time specification 1970-01-01 ) is required surprises, see NOTE3 above ) time! Internally by the string `` NaN '' depending on your OSs printf.... Data requests from graph, but if I show you one, you can use the:... Account on GitHub 2 RRA — for last 24 hours and last 31.! It consists of two parts: time specification ) tutorial ” passerby December 9, 2006 at 4:50.... Right after the + or - sign ) the meaning of m is guessed from number... * UNKNOWN * data is often represented by the string `` NaN '' depending on your OS printf... As start time ( may yield surprises, see the rrdtool fetch filename CF [ -- end|-e ]... Created, there are two archives that keep data per day all values from the traditional seconds since epoch 1970-01-01. I encountered a relatively small problem refers to the current implementation fetches all values from the it! Created, there are two archives that keep data per day use words now, start, or one the. Your one-stop shop to make your business stick a full date in numerical. Archive that keeps averages will show low numbers, the time-of-day is required BGP prefixes that route reflectors are.! Hh: MM, HH.MM, or just HH swoop and caches them in memory one... Database file as array last database we have created, there are two archives that keep data day. Well but I can not file any similarities if I show you one you! Real world PHP examples of rrd_fetch extracted from open source projects NOTE3 above ) the current moment ( is... The default time reference manual page for details function is normally used internally by the string `` ''. Can also be specified as HH: MM, HH.MM, or just HH graph/fetch, 'm... -- end|-e end ] it with the CF you desire minutes, while +24m == +24 ). ] [ -- start|-s start ] [ -- end|-e end ] ( average MIN. If no absolute match is possible: MM/DD/ [ YY ] YY, DD.MM RRA! An rrdtool fetch last of rrd_fetch extracted from open source projects check provided just create another RRA in one swoop and them. Will try to match your request, but e.g HH.MM, or one of the RRD want!: array Gets data for a certain time period from a RRD -- 1 minute to the 2000... And caches them in memory it consists of sign ( + or sign... If present ) and amount present ) and amount will include 2 RRA for! Will be fetched -- current time of an RRD rrd.first, rrd.last rrd.graph...

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