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Check_MK Werk 8353: Support for new RRD format with more efficient Disk IO

by Mathias Kettner

ID: 8353 Title: Support for new RRD format with more efficient Disk IO Component: Metrics System Level: 2 Class: New Feature Version: 1.2.7i4 The Check_MK Micro Core now supports a new format when creating RRD files. Here: LI:RRD files are kept below the new directory <tt>~/var/check_mk/rrd</tt>. LI:All metrics of one service are kept in one RRD Because now all metrics of a service are stored together in one RRD less disk blocks need to be updated when a new value is entered. This saves Disk IO. This is now possible because the RRDTool version 1.5 now supports changing existing RRDs. That way if a check outputs new metrics these can be added to an existing RRD. H2:Switch to the new format The new CMC format is not used automatically - neither for existing nor for new sites. The default for new sites might be changed in future, though. Switching your site to the new CMC format is done in the following steps: 1. Make a backup of your current RRDs (<tt>~/var/pnp4nagios/perfdata</tt>). You might be tended to skip this step as the amount of data can be large. But you have been warned. 2. Go to the ruleset Configuration of RRD databases of services (and hosts resp.) 3. Create a rule for some (or all) hosts with the setting RRD storage format: One RRD per host/service (saves disk IO, only with CMC) 4. Activate Changes - And now your system is in a state where new RRDs will automatically be created in the new format in <tt>~/var/check_mk/rrd</tt>. 5. In order to migrate the existing RRDs use the following command: C+: OM:cmk --convert-rrds -v C-: It is also possible to specify a list of hosts and limit the conversion to these: C+: OM:cmk --convert-rrds -v server01 server02 C-: Note: This keeps the existing RRDs present in <tt>~/var/pnp4nagios/perfdata</tt> and needs lots of diskspace. If you low in diskspace and are bold or if you have a backup (even better) you can directly delete the PNP format RRDs: C+: OM:cmk --convert-rrds --delete-rrds -v C-: If you decided not to delete the old RRDs in the first place you can run the command with the option <tt>--delete-rrds</tt> at any time later. Since all of you zigs of gigabytes of RRDs needs to be transformed this can take a long time. The good news: you do not need a downtime on your monitoring during this period. New RRDs are being used for storing current data as soon as they exist so with a bit luck and good disk performance you will not loose data points. H2:Old PNP SINGLE format Note: The new RRD format is almost identical with the format <tt>SINGLE</tt> that was default in PNP4Nagios a long time ago. PNP was not able to alter the list of metrics that a service did output - however. So whenever the list of performance data of a check changed the graphs ended at that point of time. There is currently no direct migration from PNP's <tt>SINGLE</tt> format to the new CMC format. But you can go the intermediate step with <tt>cmk --convert-rrds --split</tt>.

7 years, 9 months

Check_MK Werk 8355: Fixed exception about "TypeError: a float is required" in reporting

by Mathias Kettner

ID: 8355 Title: Fixed exception about "TypeError: a float is required" in reporting Component: Reporting Level: 2 Class: Bug Fix Version: 1.2.7i4 This occurred when selecting time ranges of the form The last ....

7 years, 9 months

Check_MK Werk 8344: Users can now add a pin to graphs to get specific values

by Lars Michelsen

ID: 8344 Title: Users can now add a pin to graphs to get specific values Component: Metrics System Level: 2 Class: New Feature Version: 1.2.7i4 By clicking on a graph, users can mark a specific position (time) in their graphs. This makes the graphs show the values of the marked time in the legend below the graph. The values of the graphs at the current marked time are shown in the column "pin". The time is saved per user. When the saved time of the current pin is in the range of a graph, the pin is shown and the values are displayed in the table.

7 years, 9 months

Check_MK Werk 8362: Improved error handling in case of upgrades/downgrades

by Sven Panne

ID: 8362 Title: Improved error handling in case of upgrades/downgrades Component: core Level: 2 Class: Bug Fix Version: 1.2.7i4 CMC stores its current state in versioned state files, which are only downwards-compatible. When an incompatible state file is found, we immediately terminate the monitoring core during startup. <ul> <li>When the state file version is older than the current one (e.g. after an upgrade), convert it on the fly (as previously), but keep a backup of the previous version in "state-version-XY".</li> <li>When the state file version is newer than the current one (e.g. after a downgrade), emit an error message, hinting at the backup version if there is one.</li> </ul>

7 years, 9 months

Check_MK Werk 8358: Automatic Check_MK Agent updates for Linux

by Mathias Kettner

ID: 8358 Title: Automatic Check_MK Agent updates for Linux Component: Agent Bakery Level: 3 Class: New Feature Version: 1.2.7i4 The Check_MK Agent Bakery now allows for automatically updating Check_MK Agents via HTTP/HTTPS. This is realized by a new agent plugin called <tt>cmk-update-agent</tt>, that is currently only available for Linux, but a Windows version will follow soon. The steps for setting up the automatic updates is: 1. Go to the new page for the Agent Deployment. You find a new button for this in the Agent Bakery page. 2. Fullfil all of the prerequisites that are shown on that new pages. This involves creating agents that contain the new plugin with a valid configuration and enabling the deployment. 3. Install the new prepared agents on the target hosts of your choice. 4. Call <tt>cmk-update-agent register</tt> on these systems in order to register the agents for updates. 5. Don't forget to enable the agent deployment's master switch!

7 years, 9 months

Check_MK Werk 8350: Real-time checks: Introducing checking in one second resolution

by Lars Michelsen

ID: 8350 Title: Real-time checks: Introducing checking in one second resolution Component: The Check_MK Micro Core Level: 2 Class: New Feature Version: 1.2.7i4 This release introduces a new feature named Real-time checks. With the new Real-time checks it is possible to monitor specific things a lot shorter intervals than the normal interval of 60 seconds. This feature has mainly been developed to get detailed graphs for some values which change often like for example the memory usage or CPU utilization. But not only the performance data is updated in this interval. The complete service state is updated which may also result in faster notifications. The Real-time checks are working like this: The core is listening on the network for incoming Real-time check results which are basically UDP packets sent by the agents in an interval of one second. This needds to be enabled using the configuration option Global Settings > Enable handling of Real-Time Checks. You need to configure the UDP port to listen on (6559 by default) and the secret which is used to decrypt the Real-time checks. This secret needs to be equal for the Check_MK server and all agents which are sending Real-time check results. The agents need to be configured to send Real-time check results. This can currently be done for the Linux and Windows Agents. On linux you need to create a file /etc/check_mk/real_time_checks.cfg with the following contents: F+:/etc/check_mk/real_time_checks.cfg RTC_TIMEOUT=90 RTC_PORT=6559 RTC_SECRET='hallo123' RTC_SECTIONS="" RTC_SECTIONS+="mem " RTC_SECTIONS+="cpu " F-: It is a good idea to reduce permissions on this file because it contains the real-time check secret which is shared between the Check_MK agent and the server to encrypt the transfered data. For example <tt>chmod 640 /etc/check_mk/real_time_checks.cfg</tt> is a good idea. On windows you need to add the following to the <tt>[global]</tt> section of your check_mk.ini and restart the Check_MK service: F+:check_mk.ini realtime_port = 6559 realtime_sections = mem winperf realtime_timeout = 90 passphrase = hallo123 F-: The agent is working as usual, waiting for connections from the Check_MK server. Once a Check_MK server is contacting the agent, the agent is responding with it's regular response. Now, when Real-time checks are enabled, the agent is sending one UDP packet for each enabled section per second to the host address which had queried the Check_MK agent, which is normally the Check_MK servers address. The data which can be processed as Real-time check is limited, so we limit the sections which can be send as Real-time checks. Currently you can enable only the <tt>mem</tt> and <tt>cpu</tt> sections on linux and <tt>mem</tt> and <tt>winperf</tt> on windows systems. This might be extended in the future. To get detailed graphs, you now need to configure your RRD databases to be able to store these detailed information. This can be done via the ruleset Host & Service Parameters > Monitoring Configuration > Configuration of RRD databases of services. You need to create a new rule and first need to ensure that you only apply the rule to checks which get real-time check information as the RRDs of these services need more disk space. So you should only select the CPU/Memory services of hosts which are sending Real-time check results. Then you need to configure this rule to have a 1 second precision for a duration of your choice. Just one example configuration for having: a) 1 second resolution for 4 hours b) 1 minute resolution for 2 days c) 5 minute resolution for 10 days d) 30 minute resolution for 90 days e) 6 hour resolution for 4 years You need to configure these numbers: C:+ Step (precision): 1 sec. RRA configuration: 50.0%, 1, 14400 50.0%, 60, 2880 50.0%, 300, 2880 50.0%, 1800, 4320 50.0%, 21600, 5840 C:- After you configured this, you need to run <tt>cmk --convert-rrds -v</tt> to convert the existing RRDs. After the conversion has finished and processing of the Real-time checks works correctly, you should see the service state, output and graphs e.g. of the "CPU utilisation" service updating in an interval of one second.

7 years, 9 months

Check_MK Werk 8371: Instant reports now print the timerange specified in view filters

by Lars Michelsen

ID: 8371 Title: Instant reports now print the timerange specified in view filters Component: Reporting Level: 2 Class: Bug Fix Version: 1.2.7i4

7 years, 9 months

Check_MK Werk 8359: Manage Extension Packages (MKPs) via WATO

by Mathias Kettner

ID: 8359 Title: Manage Extension Packages (MKPs) via WATO Component: WATO Level: 3 Class: New Feature Version: 1.2.7i4 WATO now has a new module for managing Check_MK Extension Packages (MKPs) via WATO. The new module helps you to create MKPs and also allows you to install MKPs (e.g. from <a href="http://exchange.check-mk.org">The Check_MK Exchange</a>. MKPs can also be distributed to your slave sites.

7 years, 9 months

Check_MK Werk 8360: Recurring downtimes now for nth day of month and xth weekday from beginning and end

by Mathias Kettner

ID: 8360 Title: Recurring downtimes now for nth day of month and xth weekday from beginning and end Component: Multisite Level: 2 Class: New Feature Version: 1.2.7i4 The recurring scheduled downtimes can now be set to appear always on the same day of the month, e.g. always on the first of the month. Also you can choose them to happen on each first, second, third or fourth Monday, Tuesday, etc. Also couting from the end of the month is possible, e.g. each last friday in the month.

7 years, 9 months

Check_MK Werk 8401: Fixed segfault for 'servicesbyhostgroup' query.

by Sven Panne

ID: 8401 Title: Fixed segfault for 'servicesbyhostgroup' query. Component: The Check_MK Micro Core Level: 2 Class: Bug Fix Version: 1.2.7i4

7 years, 9 months

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Checkmk werks level2