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/usr/bin/kcarectl - Manage KernelCare patches for your kernel.


-i, --info

Display information about patches installed by KernelCare.

-u, --update

Download latest patches, and apply them to current kernel.

--smart-update  [since 1.6]

The same as --update, but uses UPDATE_POLICY to decide where to get patches.


Unload patches.


Check if update is needed and update.


Lists applied patches.

--force  [since 2.3]

When used with update, forces applying the patch even if unable to freeze some threads.


Prints safe kernel version.


Output current license info.

--register KEY

Register using KernelCare Key.

--register-autoretry [since 2.5]

If registration fails retries registration indefinitely.


Unregister from KernelCare for Key based servers.


Try test builds instead of production builds (deprecated, use --prefix=test instead).


Patch source prefix, used to test different builds, by downloading builds from a different location, based on prefix (v2.2+)


Print KernelCare version.

--import-key PATH

Import gpg key.


Set monitoring key for IP based licenses. 16 to 32 characters, alphanumeric only [version 2.1+]

--freezer  [since 2.3]

none: don't freeze any threads;

full: freeze all threads;

smart: freezes only threads that need to be frozen for patching.

If option is not selected, best freezer method is chosen automatically.

--check [since 2.4-1]

Check if new patchset is available, without updating. Exit code 0 means there is a new kernel. 1 when there is no new kernel.

--doctor [since 2.6]

Send a report to CloudLinux support staff for diagnostics.

--set-patch-type extra

To enable extra patches.

--set-patch-type free

To enable free patches.

--set-sticky-patch SET_STICKY_PATCH

Set patch to stick to date in format DDMMYY or retrieve it from KEY if set to KEY (no support for ePortal). Empty to unstick.   More info at Sticky Patches.


Adds an extra Tag field for a server. COMMAND is a user-defined parameter. More info at Managing Servers.