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Check_MK Werk 8358: Automatic Check_MK Agent updates for Linux

by Lars Michelsen

ID: 8358 Title: Automatic Check_MK Agent updates for Linux Component: agents 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, 7 months

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

by Lars Michelsen

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

7 years, 7 months

Check_MK Werk 8356: Fix showing new metric graphs for filesystems containing a dot in their name

by Lars Michelsen

ID: 8356 Title: Fix showing new metric graphs for filesystems containing a dot in their name Component: metrics Level: 1 Class: Bug fix Version: 1.2.7i4

7 years, 7 months

Check_MK Werk 8357: Avoid exception in case of missing agent configuration

by Lars Michelsen

ID: 8357 Title: Avoid exception in case of missing agent configuration Component: agents Level: 1 Class: Bug fix Version: 1.2.7i4 This fixes the following Exception: F+: Failed to process configuration: Traceback (most recent call last): File "/omd/sites/urz/share/check_mk/web/plugins/wato/agent_bakery.py", line 1574, in mode_agents html.write(describe_agent_configuration(aghash)) File "/omd/sites/urz/share/check_mk/web/plugins/wato/agent_bakery.py", line 1612, in describe_agent_configuration conf = eval(file(defaults.var_dir + "/agents/linux_rpm/_PACKAGES/%s.conf" % aghash).read()) F-:

7 years, 7 months

Check_MK Werk 8354: Notification spooler: handle incoming connections even in situation with large spool directories

by Lars Michelsen

ID: 8354 Title: Notification spooler: handle incoming connections even in situation with large spool directories Component: Notifications Level: 2 Class: Bug fix Version: 1.2.7i4 In situations where a large bulk of notification came in from a slave the mknotify would happily handle all those notifications while at the same time forgetting to handle all the connections. They would run into timeouts that way. No the processing of notifications is limited to 3 seconds for each turn.

7 years, 7 months

Check_MK Werk 8352: Fix missing service level macro in Check_MK Micro Core

by Lars Michelsen

ID: 8352 Title: Fix missing service level macro in Check_MK Micro Core Component: cmc Level: 2 Class: Bug fix Version: 1.2.7i4 This was due to the service level being stored as an integer, but in the macros we need strings for string replace.

7 years, 7 months

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

by Lars Michelsen

ID: 8353 Title: Support for new RRD format with more efficient Disk IO Component: metrics 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 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, 7 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: cmc 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: <ul> <li>1 second resolution for 4 hours</li> <li>1 minute resolution for 2 days</li> <li>5 minute resolution for 10 days</li> <li>30 minute resolution for 90 days</li> <li>6 hour resolution for 4 years</li> </ul> You need to configure these numbers: <ul> <li>Step (precision): 1 sec.</li> <li>RRA configuration:</li> <li>50.0%, 1, 14400</li> <li>50.0%, 60, 2880</li> <li>50.0%, 300, 2880</li> <li>50.0%, 1800, 4320</li> <li>50.0%, 21600, 5840</li> </ul> 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, 7 months

Check_MK Werk 8348: Changes in custom files are now detected and tell the user to rebake the agents

by Lars Michelsen

ID: 8348 Title: Changes in custom files are now detected and tell the user to rebake the agents Component: agents Level: 1 Class: New feature Version: 1.2.7i4 It is possible to include custom files with the agent bakery for deploying the files with the agent. This is currently only available for windows systems. Changes to these files were not detected by the agent bakery. The user had to modify other rules or enforce that the agents are rebuilt. This has been changed now. All files included with an agent are monitored for changed contents now.

7 years, 7 months

Check_MK Werk 8349: MRPE checks can now be configured via agent bakery

by Lars Michelsen

ID: 8349 Title: MRPE checks can now be configured via agent bakery Component: agents Level: 1 Class: New feature Version: 1.2.7i4 The <tt>mrpe.cfg</tt> for linux and <tt>[mrpe]</tt> section for windows agents can now be configured via the agent bakery using the Execute MRPE checks ruleset. The only limitation is that the executed plugins are not automatically deployed when configuring this rule. You will have to either deploy them on your own or use the ruleset "Deploy custom files with agent" to deploy the nagios plugins needed for your MRPE checks with the bakery. Please note that custom files can currently only be deployed on windows systems.

7 years, 7 months

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Checkmk werks level1