centos7多个启动项开机默认启动顺序设置

centos服务器每次重启都会启动最新内核版本，有时候我不希望启动最新的，由于和现在某些软件不兼容，还是想选择旧的版本，下面是如何开机启动你的旧版本内核

1.如果你想要删除最新的版本，很好办

使用：uname -r 
查看现在使用的版本，现在这个内核版本也可能不是你想要的，如果你不知道你的内核版本，请重启，选择你想要的内核版本，记住你想要的内核版本，或者进入你所需要的内核版本，然后使用该命令查看
[root@root ~]# uname -r 3.10.0-514.21.2.el7.x86_64 #这个就是你的内核版本号
然后我们需要看我们当前都有哪些内核版本
[root@root ~]# rpm -qa | grep kernel
kernel-tools-libs-3.10.0-514.21.2.el7.x86_64
kernel-tools-3.10.0-514.21.2.el7.x86_64kernel-3.10.0-514.el7.x86_64 #最老的版本
kernel-3.10.0-514.21.2.el7.x86_64 #现在的版本 kernel-3.10.0-693.11.6.el7.x86_64
#最新的版本,是我想要删除的版本，直接使用yum remove kernel-3.10.0-693.11.6.el7.x86_64
abrt-addon-kerneloops-2.1.11-45.el7.centos.x86_64
abrt-addon-kerneloops-2.1.11-48.el7.centos.x86_64
kernel-headers-3.10.0-693.11.6.el7.x86_64
kernel-headers-3.10.0-514.21.2.el7.x86_64
kernel-tools-libs-3.10.0-693.11.6.el7.x86_64
kernel-tools-3.10.0-693.11.6.el7.x86_64
然后reboot即可

2.如果还想保留现在的版本
[root@root ~]# find / -name grub.cfg /boot/grub2/grub.cfg[root@root ~]# vi
/boot/grub2/grub.cfg # # DO NOT EDIT THIS FILE # # It is automatically
generated by grub2-mkconfig using templates # from /etc/grub.d and settings
from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### set pager=1 if [
-s $prefix/grubenv ]; then load_env fi if [ "${next_entry}" ] ; then set
default="${next_entry}" set next_entry= save_env next_entry set boot_once=true
else set default="${saved_entry}" fi if [ x"${feature_menuentry_id}" = xy ];
then menuentry_id_option="--id" else menuentry_id_option="" fi export
menuentry_id_option if [ "${prev_saved_entry}" ]; then set
saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry=
save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z
"${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi }
function load_video { if [ x$feature_all_video_module = xy ]; then insmod
all_video else insmod efi_gop insmod efi_uga insmod ieee1275_fb insmod vbe
insmod vga insmod video_bochs insmod video_cirrus fi } terminal_output console
if [ x$feature_timeout_style = xy ] ; then set timeout_style=menu set timeout=5
# Fallback normal timeout code in case the timeout_style feature is #
unavailable. else set timeout=5 fi ### END /etc/grub.d/00_header ### ### BEGIN
/etc/grub.d/00_tuned ### set tuned_params="" ### END /etc/grub.d/00_tuned ###
### BEGIN /etc/grub.d/01_users ### if [ -f ${prefix}/user.cfg ]; then source
${prefix}/user.cfg if [ -n "${GRUB2_PASSWORD}" ]; then set superusers="root"
export superusers password_pbkdf2 root ${GRUB2_PASSWORD} fi fi ### END
/etc/grub.d/01_users ### ### BEGIN /etc/grub.d/10_linux ###
#下面的menuentry是你启动项，从上往下是启动顺序，你可以自己调整menuentry 'CentOS Linux
(3.10.0-693.11.6.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class
gnu --class os --unrestricted $menuentry_id_option
'gnulinux-3.10.0-514.el7.x86_64-advanced-429ab68a-d2a3-40ea-90b3-368bed7ccb64'
{ load_video set gfxpayload=keep insmod gzio insmod part_msdos insmod xfs set
root='hd0,msdos1' if [ x$feature_platform_search_hint = xy ]; then search
--no-floppy --fs-uuid --set=root --hint='hd0,msdos1'
24b97fca-87b5-4af0-a204-93aaeb7f286c else search --no-floppy --fs-uuid
--set=root 24b97fca-87b5-4af0-a204-93aaeb7f286c fi linux16
/vmlinuz-3.10.0-693.11.6.el7.x86_64 root=/dev/mapper/cl_nodejs-root ro
crashkernel=auto rd.lvm.lv=cl_nodejs/root rd.lvm.lv=cl_nodejs/swap rhgb quiet
LANG=en_US.UTF-8 } menuentry 'CentOS Linux (3.10.0-514.21.2.el7.x86_64) 7
(Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted
$menuentry_id_option
'gnulinux-3.10.0-514.el7.x86_64-advanced-429ab68a-d2a3-40ea-90b3-368bed7ccb64'
{ load_video set gfxpayload=keep insmod gzio insmod part_msdos insmod xfs set
root='hd0,msdos1' if [ x$feature_platform_search_hint = xy ]; then search
--no-floppy --fs-uuid --set=root --hint='hd0,msdos1'
24b97fca-87b5-4af0-a204-93aaeb7f286c else search --no-floppy --fs-uuid
--set=root 24b97fca-87b5-4af0-a204-93aaeb7f286c fi linux16
/vmlinuz-3.10.0-514.21.2.el7.x86_64 root=/dev/mapper/cl_nodejs-root ro
crashkernel=auto rd.lvm.lv=cl_nodejs/root rd.lvm.lv=cl_nodejs/swap rhgb quiet
LANG=en_US.UTF-8 initrd16 /initramfs-3.10.0-514.21.2.el7.x86_64.img } menuentry
'CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)' --class centos --class
gnu-linux --class gnu --class os --unrestricted $menuentry_id_option
'gnulinux-3.10.0-514.el7.x86_64-advanced-429ab68a-d2a3-40ea-90b3-368bed7ccb64'
{ load_video set gfxpayload=keep insmod gzio insmod part_msdos insmod xfs set
root='hd0,msdos1' if [ x$feature_platform_search_hint = xy ]; then search
--no-floppy --fs-uuid --set=root --hint='hd0,msdos1'
24b97fca-87b5-4af0-a204-93aaeb7f286c else search --no-floppy --fs-uuid
--set=root 24b97fca-87b5-4af0-a204-93aaeb7f286c fi linux16
/vmlinuz-3.10.0-514.el7.x86_64 root=/dev/mapper/cl_nodejs-root ro
crashkernel=auto rd.lvm.lv=cl_nodejs/root rd.lvm.lv=cl_nodejs/swap rhgb quiet
LANG=en_US.UTF-8 initrd16 /initramfs-3.10.0-514.el7.x86_64.img } menuentry
'CentOS Linux (0-rescue-353f5985435f32df26dfdb5d4f9bc2a9) 7 (Core)' --class
centos --class gnu-linux --class gnu --class os --unrestricted
$menuentry_id_option
'gnulinux-0-rescue-353f5985435f32df26dfdb5d4f9bc2a9-advanced-429ab68a-d2a3-40ea-90b3-368bed7ccb64'
{ load_video insmod gzio insmod part_msdos insmod xfs set root='hd0,msdos1' if
[ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid
--set=root --hint='hd0,msdos1' 24b97fca-87b5-4af0-a204-93aaeb7f286c else search
--no-floppy --fs-uuid --set=root 24b97fca-87b5-4af0-a204-93aaeb7f286c fi
linux16 /vmlinuz-0-rescue-353f5985435f32df26dfdb5d4f9bc2a9
root=/dev/mapper/cl_nodejs-root ro crashkernel=auto rd.lvm.lv=cl_nodejs/root
rd.lvm.lv=cl_nodejs/swap rhgb quiet initrd16
/initramfs-0-rescue-353f5985435f32df26dfdb5d4f9bc2a9.img } ### END
/etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END
/etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_ppc_terminfo ### ### END
/etc/grub.d/20_ppc_terminfo ### ### BEGIN /etc/grub.d/30_os-prober ### ### END
/etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file
provides an easy way to add custom menu entries. Simply type the # menu entries
you want to add after this comment. Be careful not to change # the 'exec tail'
line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom
### if [ -f ${config_directory}/custom.cfg ]; then source
${config_directory}/custom.cfg elif [ -z "${config_directory}" -a -f
$prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END
/etc/grub.d/41_custom ###上面代码中 menuentry
元素标记是你开机的默认启动项，将你项启动的版本调整一下顺序即可，然后reboot就可以按照你调整的顺序显示了。

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