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Timeseries Graphing Engine

Learn about Opsview Monitors Graphing Data Engine

Timeseries

The Opsview Monitor Timeseries graphing data engine provides a very flexible service for storing data used by the graphing services in the UI.

In the default configuration, all data is stored on the master server. However, if you experience high IO or load on the master server, then the graphing data engine may be moved onto another server.

Installation

The graphing data engine is provided in 4 packages that are installed by default on the Orchestrator via Opsview Deploy.

  • opsview-timeseries - request dispatcher
  • opsview-timeseries-enqueuer - request queuing and caching daemon
  • opsview-timeseries-lib - shared libraries between the other timeseries packages
  • opsview-timeseries-rrd - provides the RRD based data storage

All of these packages are installed under /opt/opsview and the directory names match the package names:

  • timeseries
  • timeseriesenqueuer
  • timeserieslib
  • timeseriesrrd

Each package uses the same directory structure and they all log to syslog (usually into log files within /var/log, depending on how your system is configured).

Processes

All of the timeseries processes are stopped and started using the Opsview Monitor Watchdog. You can check them by running the following as the opsview user:

$ opsview_watchdog summary
+----------------------------------------+------------+-------------------+
| Service                                | Status     | Monitoring Status |
+----------------------------------------+------------+-------------------+
.... cut ....
| Process 'opsview-timeseriesrrdupdates' | Running    | Monitored         |
| Process 'opsview-timeseriesrrdqueries' | Running    | Monitored         |
| Process 'opsview-timeseriesenqueuer'   | Running    | Monitored         |
| Process 'opsview-timeseries'           | Running    | Monitored         |

The processes can be stopped, started and restarted individually, if required, e.g.:

$ opsview_watchdog opsview-timeseries restart

Configuration

All configuration should be done using Opsview Deploy; no changes should be made manually to any timeseries configuration file.

Moving RRD Timeseries to another server

There are a number of steps involved in moving Timeseries to another server.

The first step is to add the correct configuration into the Deploy opsview_deploy.yml file, such as

timeseries_hosts:
  opsview-uk-timeseries-1:
    ip: 10.2.14.91

and then run a deploy as root to install the packages on the new timeseries server:

cd /opt/opsview/deploy
bin/opsview-deploy lib/playbooks/timeseries-install.yml

At this point you should shut down the performance data component and all of the timeseries daemons on both the existing server and the new server:

On the existing server as root:

/opt/opsview/watchdog/bin/opsview-monit stop opsview-resultsperformance
/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseries
/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdupdates
/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdqueries

On the new server as root:

/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseries
/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdupdates
/opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdqueries

You must transfer all the data files from the existing timeseries server to the new timeseries server using rsync (or similar), otherwise all graphing history will be lost. By default, Timeseries RRD uses the /opt/opsview/timeseriesrrd/var/data directory.

After transferring, run deploy to reconfigure opsview:

cd /opt/opsview/deploy
bin/opsview-deploy lib/playbooks/setup_opsview.yml

This will restart all the daemons on the new timeseries server as well as reconfigure the UI. At this point, graphing data should now be provided from the new Timeseries server and reloads should work successfully.

After you have tested the graphs and reloads you can remove the timeseries packages and data from the old timeseries server.

Data Flow

The Results-Performance reads the results from MessageQueue and then passes the data on to the timeseries manager daemon on port 1600 on the configured host (localhost by default).

The Timeseries manager process launches and monitors worker processes (four by default) which are responsible for parsing and dispatching incoming requests. Write requests (adding more metrics from Results-Performance) are dispatched to Timeseries Enqueuers (localhost on port 1620 by default), while the queries are dispatched to Timeseries RRD Queries (localhost port 1660 by default).

Timeseries Enqueuer passes the data to all configured RRD Updater workers simultaneously (localhost with ports 1640-1643 by default)

The timeseries RRD update worker writes out the data into the rrd files. Opsview Monitor stores RRD data in /opt/opsview/timeseriesrrd/var/data/<hostname>/<servicename>/<metric>/value.rrd.

The timeseries manager, enqueuer and RRD writer daemons can all be installed on separate hosts. However, for network bandwidth usage it is generally better to keep the enqueuer and RRD daemons on the same machine.

Data Storage - RRD

When using RRD (Round Robin Database), numerical values are stored in "time buckets" so there is a single value for each of these buckets. These are the default values used by Opsview:

  • Expects a 5 minute interval for values
  • Will keep 5 minute buckets for the last 50 hours
  • Will keep 30 minute buckets for the last 2 weeks
  • Will keep 2 hour buckets for 2 months
  • Will keep 1 day buckets for 2 years

This means the resolution of data gradually gets "thinned out" over time. When calculating a "bigger bucket" (such as taking six 5 minute buckets and consolidating into a single 30 minute bucket), the average value will be used.

Note, the "RRD heartbeat" is set to 4200 seconds by default, which means that if no values are received after an hour and 10 minutes, there will be gaps in the data. If any value is received during this time, all the buckets during the last hour and 10 minutes will be filled with this value.

InfluxDB

Introduction

InfluxDB is a timeseries database created by InfluxData. It is a part of their set of tools focused at performance data which they collect, store, visualise and then raise alerts. We do not provide InfluxDB directly, instead we provide a client component that is able to communicate with InfluxDB to query and store data.

Full support for InfluxDB version 1.2.x is available since 6.0-EA which includes required configuration options.

RRD will continue being the default timeseries engine.

InfluxDB has the following differences with RRD:

  • InfluxDB will store the raw value received, whereas RRD will apply averaging based on the intervals it is defined with. This means RRDs may return non-round numbers for things that should be round (eg: number of bits transferred or number of users), whereas InfluxDB will return whole numbers back when the granularity is small enough (obviously, there maybe fractional numbers when querying the average over a whole day). For example, this is a plugin that returns back the hour it is run in. For RRD, it has an average value of 9.420 at 10:00:

InfluxDB will show the value of 10 at 10:00

  • RRD has a value for all times going back to the last year, even if that is considered NULL. InfluxDB will only return NULL points when it has got some data for the range requested.
  • For counters, RRD stores the last counter value and records the difference based on the step size. InfluxDB stores the actual values of each counter but at query time will return the derivative. If a counter is reset, this would provide a negative difference with the previous value. However, this can be a normal scenario (eg: a device restart resets its counters) - in these cases, we assume the same rate as the previous value. For an initial value that is negative, Opsview will return a NULL point

Migration from RRD to InfluxDB

Preparation

Make sure system is running the latest packages of Opsview Monitor - see our Installation/Upgrade instruction on Installation/Upgrade instructions.

Pausing performance metrics processing

# stop processing new performance data
sudo /opt/opsview/watchdog/bin/opsview-monit stop opsview-resultsperformance

# stop Timeseries RRD
sudo /opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdupdates
sudo /opt/opsview/watchdog/bin/opsview-monit stop opsview-timeseriesrrdqueries

Extracting existing timeseries data from RRDs

sudo -iu opsview /opt/opsview/timeseriesrrd/utils/rrd2perfdata.pl -i /opt/opsview/timeseriesrrd/var/data -o /tmp/rrd_data

Installing InfluxDB

# download package for your platform and follow the install documentation from InfluxDB
https://docs.influxdata.com/influxdb/v1.2/introduction/installation

# create opsview database
curl -i -XPOST http://127.0.0.1:8086/query --data-urlencode "q=CREATE DATABASE opsview"

Installing Opsview Timeseries InfluxDB Connector

Amend the Opsview Deploy configuration by amending /opt/opsview/deploy/etc/user_vars.yml or user_config.yml (depending on your system) by adding in the following lines:

opsview_timeseries_provider: influxdb
opsview_timeseries_influxdb_server_url: http://localhost:8086
opsview_timeseries_influxdb_database: opsview
opsview_timeseries_influxdb_retention_policy: autogen

Remove the current timeseries-rrd packages

# CentOS/RHEL/OL
yum remove opsview-timeseries-rrd
#Debian/Ubuntu
apt remove opsview-timeseries-rrd

and then run a deploy as root to install the required packages:

cd /opt/opsview/deploy
bin/opsview-deploy lib/playbooks/timeseries-install.yml

Restoring previous timeseries data

Get the generated username and password for the timeseries connector:

egrep "user|password" /opt/opsview/timeseries/etc/timeseries.yaml

and substitute <user>:<passwd> with the values in the following command:

# copy files into the processing directory ($OUTPUT_DIR$ is the path from previous command)
find /tmp/rrd_data/perfdatarrd/ -type f -print0 | xargs -0 -I{} curl -XPOST -u<user>:<passwd> --data-binary "@{}" -H "Content-type: text/plain" http://localhost:1600/write

# restore history
sudo -iu opsview /opt/opsview/coreutils/utils/import_servicecheck_interval_history /tmp/rrd_data/interval-history.tsv

Configure Opsview

and then run a deploy as root:

cd /opt/opsview/deploy
bin/opsview-deploy lib/playbooks/setup-opsview.yml
bin/opsview-deploy lib/playbooks/setup-monitoring.yml

and then run a reload in the UI

Troubleshooting

Drop the whole database and recreate

# drop
curl -i -XPOST http://127.0.0.1:8086/query --data-urlencode "q=DROP DATABASE opsview"
sudo rm -rf /opt/opsview/timeseriesinfluxdb/var/data/*
# recreate
curl -i -XPOST http://127.0.0.1:8086/query --data-urlencode "q=CREATE DATABASE opsview"
# restart services
sudo /opt/opsview/watchdog/bin/opsview-monit restart opsview-timeseriesinfluxdbupdates
sudo /opt/opsview/watchdog/bin/opsview-monit restart opsview-timeseriesinfluxdbqueries

Drop all metrics for specific host

$ influx -database opsview
Connected to <a href="http://localhost:8086">http://localhost:8086</a> version 1.6.0
InfluxDB shell version: 1.6.0
> DROP MEASUREMENT "switch1.opsview.com";

Drop all metrics for a specific servicecheck on specific host

$ influx -database opsview
Connected to <a href="http://localhost:8086">http://localhost:8086</a> version 1.6.0
InfluxDB shell version: 1.6.0
> DELETE FROM "switch1.opsview.com" WHERE service = 'Connectivity - Lan';

NOTE: Single and double quotes are not interchangeable! See the InfluxDB Documentation for more information

Timeseries Graphing Engine


Learn about Opsview Monitors Graphing Data Engine

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