红帽全球峰会第 16 章 启用 kdump
对于 RHEL 9 系统，您可以在特定内核或所有安装的内核中配置或者禁用 kdump 功能。但是，您必须定期测试 kdump 功能，并验证其工作状态。
16.1. 为所有安装的内核启用 kdump
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安装 kexec 工具后，kdump 服务通过启用 kdump.service 启动。您可以为在机器上安装的所有内核启用并启动 kdump 服务。
先决条件
- 有管理员特权。
流程
将
crashkernel=命令行参数添加到所有安装的内核中：grubby --update-kernel=ALL --args="crashkernel=xxM"
# grubby --update-kernel=ALL --args="crashkernel=xxM"Copy to Clipboard Copied! Toggle word wrap Toggle overflow xxM是所需的内存（以 MB 为单位）。重启系统：
reboot
# rebootCopy to Clipboard Copied! Toggle word wrap Toggle overflow 启用
kdump服务：systemctl enable --now kdump.service
# systemctl enable --now kdump.serviceCopy to Clipboard Copied! Toggle word wrap Toggle overflow
验证
检查
kdump服务是否正在运行：systemctl status kdump.service
# systemctl status kdump.service ○ kdump.service - Crash recovery kernel arming Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: disabled) Active: active (live)Copy to Clipboard Copied! Toggle word wrap Toggle overflow
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