Werk #6515: Dropped libmcrypt / php-mcrypt dependency

Component	Site management
Title	Dropped libmcrypt / php-mcrypt dependency
Date	Aug 29, 2018
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The libmcrypt library and the mcrypt php module is not necessary for Check_MK and it's major components. We drop it because it is the last dependency on RedHat distros that is fetched from the EPEL repositories. This means that we can now skip this step during initial installation and thus simplify the installation process on these systems a bit more.

The only component left that uses libmcrypt is the fairly old NSCA receiver which is still shipped with Check_MK. We keep this component for the moment since it's used by several installations and we currently have no 1:1 replacement for it. In case you need to use NSCAs encryption, which is highly recommended when you use NSCA, you may have to install libmcrypt by hand to make it work.

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