查看系统启动菜单
我们知道,centos 6.x是通过/etc/grub.conf就行内核启动顺序修改的,而且比较直观查看。但centos 7的系统和6就不一样了,是通过grub2为引导程序。下边简单说下centos 7的内核启动顺序如何修改.1
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9[root@node301 ~]# cat /boot/grub2/grub.cfg |grep menuentry
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
menuentry_id_option=""
export menuentry_id_option
menuentry 'CentOS Linux (3.10.0-327.22.2.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-327.el7.x86_64-advanced-80b9b662-0a1d-4e84-b07b-c1bf19e72d97' {
menuentry 'CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-327.el7.x86_64-advanced-80b9b662-0a1d-4e84-b07b-c1bf19e72d97' {
menuentry 'CentOS Linux (0-rescue-7d26c16f128042a684ea474c9e2c240f) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-7d26c16f128042a684ea474c9e2c240f-advanced-80b9b662-0a1d-4e84-b07b-c1bf19e72d97' {
设置默认的启动内核
比如我们选择上边中的CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)这个内核为默认启动。1
2[root@node301 ~]# grub2-set-default "CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)"
#配置默认内核
验证是否修改成功:
1 | [root@node301 ~]# grub2-editenv list |
重启机器
1 | sync |
机器重启后,查看内核版本是否正确。1
2[root@node301 ~]# uname -r
3.10.0-327.el7.x86_64