Checkmk werks level2 February 2018

checkmk-werks-lvl2@lists.checkmk.com

3 participants
4 discussions

Check_MK Werk 5781: Check_MK Update Agent: Now automatically repairs missing agent plugins after a failed windows agent update

by Andreas Umbreit

ID: 5781 Title: Check_MK Update Agent: Now automatically repairs missing agent plugins after a failed windows agent update Component: agents Level: 2 Class: Bug fix Version: 1.5.0i3 On some occassions, the windows agent may loose its agent plugins during an msi update. This issue is still being investigated. In the meantime, the cmk-update-agent.exe is now able to detect a failed installation and tries to repair the missing plugin files. Keep in mind that this workaround is only available -after- the next agent update, so the initial rollout of this update may still fail, since it is done by an earlier version of the agent updater.

6 years, 6 months

Check_MK Werk 5781: Check_MK Update Agent: Now automatically repairs missing agent plugins after a failed windows agent update

by Andreas Umbreit

6 years, 6 months

Check_MK Werk 5732: BI aggregations are now customer aware

by Lars Michelsen

ID: 5732 Title: BI aggregations are now customer aware Component: WATO Level: 2 Class: New feature Version: 1.5.0i3 The configuration if the BI aggregations is now handled in a customer aware way by the Check_MK Managed Services Edition. You can now configure each aggregation to be associated with a customer, the provider or being globally available. The aggregations are assigned to the provider by default. In case you want to have an aggregation only be synchronized to a single customer, you can configure it in the aggregation properties. A customer only get's the BI packs and BI rules synchronized that are needed to handle the aggregations that are made available to this customer.

6 years, 6 months

Check_MK Werk 5671: Use RE2 regular expression engine for Livestatus queries.

by Sven Panne

ID: 5671 Title: Use RE2 regular expression engine for Livestatus queries. Component: Livestatus Level: 2 Class: New feature Version: 1.5.0i3 Livestatus offers various places where a regular expression can be used, e.g. in its "Filter:" header for GET queries. The previous implementation had various problems, which have all been fixed by switching to a new regular expression engine (RE2, see https://github.com/google/re2): <ul> <li>Unicode was not handled correctly: RE2 fully understands UTF-8, so this has been fixed.</li> <li>Unbounded memory usage during matching: This could lead to stack overflows and CMC/Nagios crashes when trying to match some classes of regular expressions on long inputs. RE2 guarantees that this won't happen, it either complains that a regular expression is too complicated (which is hard to provoke) or runs in constant memory afterwards.</li> <li>Exponential runtime: Some classes of regular expressions could lead to exponential runtime, blocking Livestatus threads and using CPU time for some millenia or more. RE2's runtime is linear in the size of the regular expression and the input, so this has been fixed, too.</li> </ul> As an additional bonus, most of the time RE2 is quite a bit faster than the previous implementation. RE2's regular expression syntax (https://github.com/google/re2/wiki/Syntax) is basically a superset of the previous POSIX extended regular expression syntax (http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag…), so you won't have to change your patterns. Note that one esoteric detail is different, though, namely the semantics of submatching (see https://swtch.com/~rsc/regexp/regexp2.html#posix). If you relied on this, you probably already had some problems, because almost every POSIX regex implementation out there was buggy in some way (see https://wiki.haskell.org/Regex_Posix#Results_and_Bugs).

6 years, 6 months

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Checkmk werks level2 February 2018