红帽全球峰会16.3. Disabling the kdump service
You can stop the kdump.service and disable the service from starting on your Red Hat Enterprise Linux systems.
Prerequisites
-
Fulfilled requirements for
kdumpconfigurations and targets. For details, see Supported kdump configurations and targets.
Procedure
To stop the
kdumpservice in the current session:# systemctl stop kdump.serviceTo disable the
kdumpservice:# systemctl disable kdump.service
You must set kptr_restrict=1 as default. When kptr_restrict is set to (1) as default, the kdumpctl service loads the crash kernel regardless of whether the Kernel Address Space Layout (KASLR) is enabled.
If kptr_restrict is not set to 1 and KASLR is enabled, the contents of /proc/kore file are generated as all zeros. The kdumpctl service fails to access the /proc/kcore file and load the crash kernel. The kexec-kdump-howto.txt file displays a warning message, which suggest you to set kptr_restrict=1. Verify for the following in the sysctl.conf file to ensure that kdumpctl service loads the crash kernel:
-
Kernel
kptr_restrict=1in thesysctl.conffile.
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