内容纲要
1.环境信息
[root@01 ~]# uname -r
2.6.32-754.35.1.el6.x86_64
[root@01 ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@01 ~]# gcc --version
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
2.需求产生
安装docker 内核太老了
Requires: container-selinux ＞= 2:2.74
想着升级内核
3.升级内核
升级内核参考教程https://cloud.tencent.com/developer/article/1550150?areaSource=106000.15&traceId=jZePpaN_thSIxOrNikxdc
果不其然事情不会一帆风顺
3.1第一卡
sh -c ' yes “” | make oldconfig' 这一步一直报Compile also drivers which will not load (COMPILE_TEST) [N/y/?] (NEW) Y 需要手动make oldconfig然后一直回车,因为会有一些默认项
3.2第二卡
到make bzImage报错
error: #error Sorry, your compiler is too old - please upgrade itGCC版本4.4.7太低
3.3升级GCC
刚开始想着rpm安装,结果这个centos6.5升级centos7.9是半成品
缺依赖 安依赖,结果又提示libc.so.6(GLIBC_2.17)(64bit) is needed by ,明明系统就是2.17 吐了
最后找到一篇文章 编译安装 (此文有错漏,下面是我自己做些小修改的教程)
https://blog.csdn.net/MicePro/article/details/100139473
3.3.1 下载文件
mpfr原文的下载地址404 变了 以下为正确的
mkdir -p /tmp/gcc #创建目录/data/gcc
cd /tmp/gcc
wget https://gmplib.org/download/gmp/gmp-6.1.2.tar.xz #下载gmp6.1.2
wget https://www.mpfr.org/mpfr-3.1.5/mpfr-3.1.5.tar.gz #下载mpfr3.1.5
wget ftp://ftp.gnu.org/gnu/mpc/mpc-1.0.3.tar.gz #下载mpc1.0.3
wget ftp://ftp.gnu.org/gnu/gcc/gcc-6.3.0/gcc-6.3.0.tar.gz #下载gcc6.3.0
3.3.2 编译安装gmp
tar -xvf gmp-6.1.2.tar.xz gmp-6.1.2
cd gmp-6.1.2
./configure --prefix=/usr/local/gcc/gmp --build=x86_64-linux
make && make install
3.3.3 编译安装mpfr3.1.5
tar -zxvf mpfr-3.1.5.tar.gz
cd mpfr-3.1.5
./configure --prefix=/usr/local/gcc/mpfr --with-gmp=/usr/local/gcc/gmp
make && make install
3.3.4 编译安装mpc1.0.3
tar -zxvf mpc-1.0.3.tar.gz mpc-1.0.3
cd mpc-1.0.3
./configure --prefix=/usr/local/gcc/mpc --with-gmp=/usr/local/gcc/gmp -with-mpfr=/usr/local/gcc/mpfr
make && make install
3.3.5 添加环境变量
vim /etc/profile
####最后加一行
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/gcc/mpc/lib:/usr/local/gcc/gmp/lib:/usr/local/gcc/mpfr/lib3.3.6 重载刷新动态库
source /etc/profile
ldconfig -v3.3.7 编译安装gcc 6.3.0
tar xvf gcc-6.3.0.tar.gz
cd gcc-6.3.0
./configure --prefix=/usr/local/gcc --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gcc/gmp --with-mpfr=/usr/local/gcc/mpfr --with-mpc=/usr/local/gcc/mpc
##$(nproc)是cpu核心数 make -j $(nproc)全核心编译,如果上面有跑服务,根据自己需求调整 make 或者make -j 2 什么的
make -j $(nproc) && make install
3.3.8 备份旧GCC
mv /usr/bin/gcc /usr/bin/gcc-bak
mv /usr/bin/g++ /usr/bin/g++-bak
mv /usr/bin/c++ /usr/bin/c++-bak3.3.9 建立新GCC软链接并刷新
ln -s /usr/local/gcc/bin/gcc /usr/bin/gcc
ln -s /usr/local/gcc/bin/c++ /usr/bin/c++
ln -s /usr/local/gcc/bin/g++ /usr/bin/g++
ln -s /usr/local/gcc/lib64/libstdc++.so.6.0.22 /usr/lib64/libstdc++.so.6
ldconfig -v泪流满面 6.3.0
[root@01 gcc-6.3.0]# gcc --version
gcc (GCC) 6.3.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.3.4 下载编译内核
不同版本的需要的GCC版本不一样 我目前是GCC6.3.0
内核下载地址: https://www.kernel.org/ 下的慢可以迅雷下载 再传到服务器
比较新的内核最好升级openssl到1.1.1 或者 3,本站搜openssl有教程
3.4.1 错误版本踩坑
测试 5.4.271 不行
�[root@t01 linux-5.4.271]# cp /boot/config-2.6.32-754.35.1.el6.x86_64 ./.config
[root@01 linux-5.4.271]# ls
arch CREDITS fs Kbuild LICENSES net security virt
block crypto include Kconfig MAINTAINERS README sound
certs Documentation init kernel Makefile samples tools
COPYING drivers ipc lib mm scripts usr
[root@01 linux-5.4.271]# make menuconfig
HOSTCC scripts/basic/fixdep
UPD scripts/kconfig/mconf-cfg
HOSTCC scripts/kconfig/mconf.o
HOSTCC scripts/kconfig/lxdialog/checklist.o
HOSTCC scripts/kconfig/lxdialog/inputbox.o
HOSTCC scripts/kconfig/lxdialog/menubox.o
HOSTCC scripts/kconfig/lxdialog/textbox.o
HOSTCC scripts/kconfig/lxdialog/util.o
HOSTCC scripts/kconfig/lxdialog/yesno.o
HOSTCC scripts/kconfig/confdata.o
HOSTCC scripts/kconfig/expr.o
LEX scripts/kconfig/lexer.lex.c
YACC scripts/kconfig/parser.tab.[ch]
HOSTCC scripts/kconfig/lexer.lex.o
HOSTCC scripts/kconfig/parser.tab.o
HOSTCC scripts/kconfig/preprocess.o
HOSTCC scripts/kconfig/symbol.o
HOSTLD scripts/kconfig/mconf
scripts/kconfig/mconf Kconfig
.config:347:warning: symbol value 'm' invalid for MICROCODE
.config:489:warning: symbol value 'm' invalid for CPU_FREQ_STAT
.config:505:warning: symbol value 'm' invalid for X86_INTEL_PSTATE
.config:574:warning: symbol value 'm' invalid for PCCARD_NONSTATIC
.config:580:warning: symbol value 'm' invalid for HOTPLUG_PCI_SHPC
.config:706:warning: symbol value 'm' invalid for NF_CT_PROTO_DCCP
.config:707:warning: symbol value 'm' invalid for NF_CT_PROTO_GRE
.config:708:warning: symbol value 'm' invalid for NF_CT_PROTO_SCTP
.config:709:warning: symbol value 'm' invalid for NF_CT_PROTO_UDPLITE
.config:2812:warning: symbol value 'm' invalid for MFD_WM8400
.config:2813:warning: symbol value 'm' invalid for MFD_WM831X
.config:2814:warning: symbol value 'm' invalid for MFD_WM8350
.config:2827:warning: symbol value 'm' invalid for MFD_WM8350_I2C
.config:2829:warning: symbol value 'm' invalid for AB3100_CORE
.config:2864:warning: symbol value 'm' invalid for LIRC
*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.
[root@01 linux-5.4.271]# make -j3
/tmp/linux-5.4.271/Makefile:639: include/config/auto.conf: No such file or directory
/tmp/linux-5.4.271/Makefile:685: include/config/auto.conf.cmd: No such file or directory
HOSTCC scripts/kconfig/conf.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --syncconfig Kconfig
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/errno.h
WRAP arch/x86/include/generated/uapi/asm/fcntl.h
WRAP arch/x86/include/generated/uapi/asm/ioctl.h
WRAP arch/x86/include/generated/uapi/asm/ioctls.h
WRAP arch/x86/include/generated/uapi/asm/ipcbuf.h
WRAP arch/x86/include/generated/uapi/asm/param.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/uapi/asm/resource.h
WRAP arch/x86/include/generated/uapi/asm/socket.h
WRAP arch/x86/include/generated/uapi/asm/sockios.h
WRAP arch/x86/include/generated/uapi/asm/termbits.h
WRAP arch/x86/include/generated/uapi/asm/termios.h
WRAP arch/x86/include/generated/uapi/asm/types.h
You are building kernel with non-retpoline compiler.
Please update your compiler.
make[1]: *** [checkbin] Error 1
make[1]: *** Waiting for unfinished jobs....
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
make: *** [sub-make] Error 24.19.309 报GCC编译器版本过低
[root@tomratrt01 linux-4.19.309]# cp /boot/config-2.6.32-754.35.1.el6.x86_64 ./.config
cp: overwrite `./.config'? y
[root@tomratrt01 linux-4.19.309]# make menuconfig
UPD scripts/kconfig/.mconf-cfg
HOSTCC scripts/kconfig/mconf.o
HOSTCC scripts/kconfig/lxdialog/checklist.o
HOSTCC scripts/kconfig/lxdialog/inputbox.o
HOSTCC scripts/kconfig/lxdialog/menubox.o
HOSTCC scripts/kconfig/lxdialog/textbox.o
HOSTCC scripts/kconfig/lxdialog/util.o
HOSTCC scripts/kconfig/lxdialog/yesno.o
HOSTLD scripts/kconfig/mconf
scripts/kconfig/mconf Kconfig
.config:347:warning: symbol value 'm' invalid for MICROCODE
.config:489:warning: symbol value 'm' invalid for CPU_FREQ_STAT
.config:505:warning: symbol value 'm' invalid for X86_INTEL_PSTATE
.config:574:warning: symbol value 'm' invalid for PCCARD_NONSTATIC
.config:580:warning: symbol value 'm' invalid for HOTPLUG_PCI_SHPC
.config:706:warning: symbol value 'm' invalid for NF_CT_PROTO_DCCP
.config:708:warning: symbol value 'm' invalid for NF_CT_PROTO_SCTP
.config:709:warning: symbol value 'm' invalid for NF_CT_PROTO_UDPLITE
.config:848:warning: symbol value 'm' invalid for NF_NAT_PROTO_DCCP
.config:850:warning: symbol value 'm' invalid for NF_NAT_PROTO_UDPLITE
.config:851:warning: symbol value 'm' invalid for NF_NAT_PROTO_SCTP
.config:2812:warning: symbol value 'm' invalid for MFD_WM8400
.config:2813:warning: symbol value 'm' invalid for MFD_WM831X
.config:2814:warning: symbol value 'm' invalid for MFD_WM8350
.config:2827:warning: symbol value 'm' invalid for MFD_WM8350_I2C
.config:2829:warning: symbol value 'm' invalid for AB3100_CORE
.config:2864:warning: symbol value 'm' invalid for LIRC
*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.
[root@tomratrt01 linux-4.19.309]# make -j3
scripts/kconfig/conf --syncconfig Kconfig
You are building kernel with non-retpoline compiler.
Please update your compiler.
make: *** [checkbin] Error 13.4.2可用版本编译
最后找到一篇文章 4.13.2内核可以 命令输出也都有
https://cloud.tencent.com/developer/article/2086797?areaSource=102001.18&traceId=-bfAfNlN-cnDEalS-NtRm
简略命令
wget https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.13.2.tar.gz
tar -zxvf linux-4.13.2.tar.gz
cd linux-4.13.2
cp /boot/config-2.6.32-754.35.1.el6.x86_64 ./.config
make menuconfig
make -j3
make modules_install
make install
ls /boot
cat /boot/grub/grub.conf
#default改为0
vim /boot/grub/grub.conf
reboot
具体输出
4.13.2 在title第一个 default值改为0
[root@01 linux-4.13.2]# make menuconfig
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/mconf.o
SHIPPED scripts/kconfig/zconf.tab.c
SHIPPED scripts/kconfig/zconf.lex.c
SHIPPED scripts/kconfig/zconf.hash.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTCC scripts/kconfig/lxdialog/checklist.o
HOSTCC scripts/kconfig/lxdialog/util.o
HOSTCC scripts/kconfig/lxdialog/inputbox.o
HOSTCC scripts/kconfig/lxdialog/textbox.o
HOSTCC scripts/kconfig/lxdialog/yesno.o
HOSTCC scripts/kconfig/lxdialog/menubox.o
HOSTLD scripts/kconfig/mconf
scripts/kconfig/mconf Kconfig
.config:347:warning: symbol value 'm' invalid for MICROCODE
.config:489:warning: symbol value 'm' invalid for CPU_FREQ_STAT
.config:505:warning: symbol value 'm' invalid for X86_INTEL_PSTATE
.config:574:warning: symbol value 'm' invalid for PCCARD_NONSTATIC
.config:706:warning: symbol value 'm' invalid for NF_CT_PROTO_DCCP
.config:708:warning: symbol value 'm' invalid for NF_CT_PROTO_SCTP
.config:709:warning: symbol value 'm' invalid for NF_CT_PROTO_UDPLITE
.config:848:warning: symbol value 'm' invalid for NF_NAT_PROTO_DCCP
.config:850:warning: symbol value 'm' invalid for NF_NAT_PROTO_UDPLITE
.config:851:warning: symbol value 'm' invalid for NF_NAT_PROTO_SCTP
.config:2812:warning: symbol value 'm' invalid for MFD_WM8400
.config:2813:warning: symbol value 'm' invalid for MFD_WM831X
.config:2814:warning: symbol value 'm' invalid for MFD_WM8350
.config:2827:warning: symbol value 'm' invalid for MFD_WM8350_I2C
.config:2829:warning: symbol value 'm' invalid for AB3100_CORE
*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.
[root@t01 linux-4.13.2]# make -j3
HOSTCC scripts/kconfig/conf.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --silentoldconfig Kconfig
SYSTBL arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h
CHK include/config/kernel.release
SYSHDR arch/x86/entry/syscalls/../../include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/entry/syscalls/../../include/generated/asm/unistd_64_x32.h
#太长省略中间输出保留头尾......
IHEX firmware/mts_edge.fw
IHEX firmware/edgeport/down3.bin
IHEX2FW firmware/emi26/loader.fw
IHEX2FW firmware/emi26/firmware.fw
IHEX2FW firmware/emi26/bitstream.fw
IHEX2FW firmware/emi62/loader.fw
IHEX2FW firmware/emi62/bitstream.fw
IHEX2FW firmware/emi62/spdif.fw
IHEX2FW firmware/emi62/midi.fw
H16TOFW firmware/edgeport/boot.fw
H16TOFW firmware/edgeport/boot2.fw
H16TOFW firmware/edgeport/down.fw
H16TOFW firmware/edgeport/down2.fw
IHEX2FW firmware/whiteheat_loader.fw
IHEX2FW firmware/whiteheat.fw
IHEX2FW firmware/keyspan_pda/keyspan_pda.fw
IHEX2FW firmware/keyspan_pda/xircom_pgs.fw
[root@01 linux-4.13.2]# make modules_install
INSTALL arch/x86/crypto/aes-x86_64.ko
INSTALL arch/x86/crypto/aesni-intel.ko
INSTALL arch/x86/crypto/crc32c-intel.ko
INSTALL arch/x86/crypto/ghash-clmulni-intel.ko
INSTALL arch/x86/crypto/glue_helper.ko
INSTALL arch/x86/crypto/salsa20-x86_64.ko
INSTALL arch/x86/crypto/sha512-ssse3.ko
INSTALL arch/x86/crypto/twofish-x86_64.ko
.........
INSTALL /lib/firmware/edgeport/boot.fw
INSTALL /lib/firmware/edgeport/boot2.fw
INSTALL /lib/firmware/edgeport/down.fw
INSTALL /lib/firmware/edgeport/down2.fw
INSTALL /lib/firmware/edgeport/down3.bin
INSTALL /lib/firmware/whiteheat_loader.fw
INSTALL /lib/firmware/whiteheat.fw
INSTALL /lib/firmware/keyspan_pda/keyspan_pda.fw
INSTALL /lib/firmware/keyspan_pda/xircom_pgs.fw
DEPMOD 4.13.2
[root@01 linux-4.13.2]# make install
sh ./arch/x86/boot/install.sh 4.13.2 arch/x86/boot/bzImage \
System.map "/boot"
ERROR: modinfo: could not find module AliSecGuard
ERROR: modinfo: could not find module microcode
[root@tomratrt01 linux-4.13.2]# ls /boot
config-2.6.32-431.23.3.el6.x86_64 symvers-2.6.32-754.35.1.el6.x86_64.gz
config-2.6.32-696.20.1.el6.x86_64 System.map
config-2.6.32-754.12.1.el6.x86_64 System.map-2.6.32-431.23.3.el6.x86_64
config-2.6.32-754.35.1.el6.x86_64 System.map-2.6.32-696.20.1.el6.x86_64
efi System.map-2.6.32-754.12.1.el6.x86_64
grub System.map-2.6.32-754.35.1.el6.x86_64
grub.cfg.aliyun_backup System.map-4.13.2
initramfs-2.6.32-431.23.3.el6.x86_64.img System.map-4.13.2.old
initramfs-2.6.32-696.20.1.el6.x86_64.img vmlinuz
initramfs-2.6.32-754.12.1.el6.x86_64.img vmlinuz-2.6.32-431.23.3.el6.x86_64
initramfs-2.6.32-754.35.1.el6.x86_64.img vmlinuz-2.6.32-696.20.1.el6.x86_64
initramfs-4.13.2.img vmlinuz-2.6.32-754.12.1.el6.x86_64
symvers-2.6.32-431.23.3.el6.x86_64.gz vmlinuz-2.6.32-754.35.1.el6.x86_64
symvers-2.6.32-696.20.1.el6.x86_64.gz vmlinuz-4.13.2
symvers-2.6.32-754.12.1.el6.x86_64.gz vmlinuz-4.13.2.old
[root@01 linux-4.13.2]# cat /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/vda1 net.ifnames=0 console=tty0 console=ttyS0,115200n8
# initrd /boot/initrd-[generic-]version.img
#boot=/dev/xvda
default=1
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS Linux (4.13.2)
root (hd0,0)
kernel /boot/vmlinuz-4.13.2 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-4.13.2.img
title CentOS Linux (2.6.32-754.35.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-754.35.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-754.35.1.el6.x86_64.img
title CentOS (2.6.32-754.12.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-754.12.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-754.12.1.el6.x86_64.img
title CentOS (2.6.32-696.20.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-696.20.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-696.20.1.el6.x86_64.img
title CentOS (2.6.32-431.23.3.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-431.23.3.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-431.23.3.el6.x86_64.img
[root@01 linux-4.13.2]# vim /boot/grub/grub.conf
##4.13.2 在title第一个 default值改为0
[root@t01 itrms-manager]# cat /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/vda1 net.ifnames=0 console=tty0 console=ttyS0,115200n8
# initrd /boot/initrd-[generic-]version.img
#boot=/dev/xvda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS Linux (4.13.2)
root (hd0,0)
kernel /boot/vmlinuz-4.13.2 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-4.13.2.img
title CentOS Linux (2.6.32-754.35.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-754.35.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-754.35.1.el6.x86_64.img
title CentOS (2.6.32-754.12.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-754.12.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-754.12.1.el6.x86_64.img
title CentOS (2.6.32-696.20.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-696.20.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-696.20.1.el6.x86_64.img
title CentOS (2.6.32-431.23.3.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-431.23.3.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM net.ifnames=0 console=tty0 console=ttyS0,115200n8
initrd /boot/initramfs-2.6.32-431.23.3.el6.x86_64.img
[root@t01 ~]$ reboot
[root@01 ~]$ uname -r
4.13.2
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