# rpm -import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org # rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm # 查看kernrl版本 # yum --disablerepo="*" --enablerepo="elrepo-kernel" list available Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * elrepo-kernel: syd.mirror.rackspace.com Available Packages elrepo-release.noarch 7.0-5.el7.elrepo elrepo-kernel kernel-lt.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-devel.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-doc.noarch 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-headers.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-tools.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-tools-libs.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-lt-tools-libs-devel.x86_64 4.4.241-1.el7.elrepo elrepo-kernel kernel-ml-doc.noarch 5.9.6-1.el7.elrepo elrepo-kernel kernel-ml-headers.x86_64 5.9.6-1.el7.elrepo elrepo-kernel kernel-ml-tools.x86_64 5.9.6-1.el7.elrepo elrepo-kernel kernel-ml-tools-libs.x86_64 5.9.6-1.el7.elrepo elrepo-kernel kernel-ml-tools-libs-devel.x86_64 5.9.6-1.el7.elrepo elrepo-kernel perf.x86_64 5.9.6-1.el7.elrepo elrepo-kernel python-perf.x86_64 5.9.6-1.el7.elrepo elrepo-kernel
版本性質:主分支ml(mainline),穩定版(stable),長期維護版lt(longterm)
本文安裝的是主分支ml的5.9.6node
# yum -y --enablerepo=elrepo-kernel install kernel-ml.x86_64 kernel-ml-devel.x86_64 # 查看安裝好的kernel,已經安裝成功 [root@qd01-stop-k8s-node004 ~]# rpm -qa|grep kernel kernel-headers-3.10.0-957.el7.x86_64 kernel-tools-libs-3.10.0-957.el7.x86_64 kernel-ml-devel-5.9.6-1.el7.elrepo.x86_64 kernel-3.10.0-957.el7.x86_64 abrt-addon-kerneloops-2.1.11-52.el7.centos.x86_64 kernel-devel-3.10.0-957.el7.x86_64 kernel-tools-3.10.0-957.el7.x86_64 kernel-ml-5.9.6-1.el7.elrepo.x86_64 libreport-plugin-kerneloops-2.1.11-42.el7.centos.x86_64
主要修改了GRUB_DEFAULT=0
python
cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=0 GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto biosdevname=0 net.ifnames=0 rhgb quiet" GRUB_DISABLE_RECOVERY="true"
# grub2-mkconfig -o /boot/grub2/grub.cfg # reboot
若是重啓後若是發現系統一直沒起來。
~恭喜你~,進入排錯環節
這裏經過管理網卡,查看報錯以下圖ios
CentOS 7.6 從內核 3.10.0 升級到 5.x後,重啓不了,緣由是 Linux 內核 4.4.x 版本以後,dracut 命令生成的 initramfs 默認不會自動加載 mpt3sas 驅動模塊。由於沒有對應的驅動程序,因此識別不了系統盤,從而致使內核 vmlinuz 沒法加載它的 rootfscentos
一、查詢initramfs的驅動bash
# lsinitrd -k 3.10.0-957.el7.x86_64 | grep mpt[23]sas drwxr-xr-x 2 root root 0 Nov 2 20:22 usr/lib/modules/3.10.0-957.el7.x86_64/kernel/drivers/scsi/mpt3sas -rw-r--r-- 1 root root 92972 Nov 9 2018 usr/lib/modules/3.10.0-957.el7.x86_64/kernel/drivers/scsi/mpt3sas/mpt2sas.ko.xz # ls /usr/lib/modules/5.9.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko /usr/lib/modules/5.9.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko 能夠看到在3.10內核的時候是mpt2sas驅動,能夠在5.x內核中看到,新版的內核已經把mpt2sas升級爲mpt3sas
二、解決方法一ide
a、修改/etc/dracut.conf文件 sed -i '/#add_drivers+=""/aadd_drivers+="mpt3sas"' /etc/dracut.conf b、從新生成initramfs # cd /boot # dracut -f /boot/initramfs-5.9.6-1.el7.elrepo.x86_64.img 5.9.6-1.el7.elrepo.x86_64 c、檢查 # lsinitrd -k 5.9.6-1.el7.elrepo.x86_64 | grep mpt[23]sas drwxr-xr-x 2 root root 0 Nov 9 10:27 usr/lib/modules/5.9.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas -rwxr--r-- 1 root root 481320 Nov 9 10:27 usr/lib/modules/5.9.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko d、重啓 # reboot
三、解決方法二oop
強制加載驅動 # dracut --force --add-drivers mpt3sas --kver=5.9.6 # reboot