和 rhel6的默认启动顺序的修改方法,不太一样,需要使用grub2来修改。具体如下,
比如想修改 Server, with 3.10.0-123.el7.x86_64作为默认的启动项, --首先找到各菜单项 menuentry [root@ ~]# cat //grub2/grub.cfg | Oracle Linux Server menuentry 'Oracle Linux Server, with Linux 3.10.0-123.el7.x86_64' --class --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-255a4ef5-766f-4992-baaa-a1b3c5488b33' { menuentry 'Oracle Linux Server, with Unbreakable Enterprise Kernel 3.8.13-35.3.1.el7uek.x86_64' --class oracle --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.8.13-35.3.1.el7uek.x86_64-advanced-255a4ef5-766f-4992-baaa-a1b3c5488b33' { menuentry 'Oracle Linux Server, with Linux 0-rescue-171210b6f8734bbe81074e4c0306c0f3' --class --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-171210b6f8734bbe81074e4c0306c0f3-advanced-255a4ef5-766f-4992-baaa-a1b3c5488b33' { if [ "x$default" = 'Oracle Linux Server, with Linux 3.10.0-123.el7.x86_64' ]; then default='Advanced options for Oracle Linux Server>Oracle Linux Server, with Linux 3.10.0-123.el7.x86_64'; fi; --设置Oracle Linux Server, with Linux 3.10.0-123.el7.x86_64作为默认的启动项 [root@dbserver ~]# grub2-set-default "Oracle Linux Server, with Linux 3.10.0-123.el7.x86_64"
--验证默认启动项
[root@dbserver ~]# grub2-editenv list saved_entry= Server, with 3.10.0-123.el7.x86_64 --自动生成GRUB2配置文件 [root@ ~]# grub2-mkconfig -o //grub2/grub.cfg 下次重启,就会默认自动启动第一项了。