Checkmk Werk 11868: mkbackup: Fix permission issues when backing up different sites

ID: 11868 Title: mkbackup: Fix permission issues when backing up different sites Component: Core & setup Level: 1 Class: Bug fix Version: 2.1.0i1 The site and appliance backup functionality of Checkmk share a global lock which ensures that only a single backup or restore job is running at a time. However, on current linux distributions, a permission issue may occur when backing up multiple sites on a single Checkmk server. The problem appears when one site creates the global lock file (<tt>/tmp/mkbackup.lock</tt>), locks it and releases the lock after the backup. The file is kept after that. Once another site tries to lock the file during it's backup, a "Permission denied" error is raised. This is caused by specific file restrictions in directories where the sticky bit is set. The lock file has now been moved to <tt>/var/lock/mkbackup/mkbackup.lock</tt> to solve this issue.