本文源自:https://blog.wxlost.com/oracle_centos7_reinstall.html
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Centos7重装
首次从C7重装为C7
将以下代码全部复制后到ssh粘贴回车即可
主要是使用initrd.img和vmlinuz来运行网络VNC
yum -y install wget vim lsof net-tools
cat << EOF >/boot/Reinstall.sh
#!/bin/bash
rm -rf /boot/initrd77.img /boot/vmlinuz77
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/initrd.img -O /boot/initrd77.img
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/vmlinuz -O /boot/vmlinuz77
cat << EOFEOF>/etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 \\\$0
# 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.
menuentry "VNCInstallCentos7" {
set root='(hd0,gpt3)'
linuxefi /boot/vmlinuz77 inst.vnc inst.vncpassword=11223355 inst.headless ip=dhcp nameserver=114.114.114.114 inst.repo=http://vault.centos.org/7.2.1511/os/x86_64/ inst.lang=en_US inst.keymap=us
initrdefi /boot/initrd77.img
}
EOFEOF
#sed -i 's/GRUB_DEFAULT=saved/g' /etc/default/grub
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
grub2-reboot VNCInstallCentos7
reboot
EOF
bash /boot/Reinstall.sh等待网络核心启动完成,然后用vnc连接机器IP:1 密码为11223355
再次从C7重装为C7
将以下代码全部复制后到ssh粘贴回车即可(注意这里的gpt2,有些机器可能是gpt3)
yum -y install wget vim lsof net-tools
cat << EOF >/boot/Reinstall.sh
#!/bin/bash
rm -rf /boot/initrd77.img /boot/vmlinuz77
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/initrd.img -O /boot/initrd77.img
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/vmlinuz -O /boot/vmlinuz77
cat << EOFEOF>/etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 \\\$0
# 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.
menuentry "VNCInstallCentos7" {
set root='(hd0,gpt2)'
linuxefi /vmlinuz77 inst.vnc inst.vncpassword=11223355 inst.headless ip=dhcp nameserver=114.114.114.114 inst.repo=http://vault.centos.org/7.2.1511/os/x86_64/ inst.lang=en_US inst.keymap=us
initrdefi /initrd77.img
}
EOFEOF
#sed -i 's/GRUB_DEFAULT=saved/g' /etc/default/grub
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
grub2-reboot VNCInstallCentos7
reboot
EOF
bash /boot/Reinstall.sh等待网络核心启动完成,然后用vnc连接机器IP:1 密码为11223355
从原生Linux系统重装为C7
将以下代码全部复制后到ssh粘贴回车即可
yum -y install wget vim lsof net-tools
cat << EOF >/boot/Reinstall.sh
#!/bin/bash
rm -rf /boot/initrd77.img /boot/vmlinuz77
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/initrd.img -O /boot/initrd77.img
wget -P /boot/ http://vault.centos.org/7.2.1511/os/x86_64/images/pxeboot/vmlinuz -O /boot/vmlinuz77
cat << EOFEOF>/etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 \\\$0
# 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.
menuentry "VNCInstallCentos7" {
set root='(hd0,gpt3)'
linuxefi /boot/vmlinuz77 inst.vnc inst.vncpassword=11223355 inst.headless ip=dhcp nameserver=114.114.114.114 inst.repo=http://vault.centos.org/7.2.1511/os/x86_64/ inst.lang=en_US inst.keymap=us
initrdefi /boot/initrd77.img
}
EOFEOF
#sed -i 's/GRUB_DEFAULT=saved/g' /etc/default/grub
grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
grub2-reboot VNCInstallCentos7
reboot
EOF
bash /boot/Reinstall.sh等待网络核心启动完成,然后用vnc连接机器IP:1 密码为11223355
Win7
此DD包仅适用于Oracle甲骨文Ubuntu DD Win使用
说明:Oracle是采用UEFI启动,普通DD包均不支持UEFI启动
DD Windows 7 64位旗舰精简版 Oracle甲骨文专用 [账户Administrator密码www.nat.ee]
apt-get install -y xz-utils openssl gawk file wget --no-check-certificate -qO InstallNET.sh 'https://moeclub.org/attachment/LinuxShell/InstallNET.sh' && bash InstallNET.sh -dd 'https://api.moeclub.org/GoogleDrive/1NHKdm3xfQ3HySNCGvrzgdz7RMVCI1qGy'
Centos7开启bbr
wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-ml-5.10.16-1.el7.elrepo.x86_64.rpm
yum install -y ./kernel-ml-5.10.16-1.el7.elrepo.x86_64.rpm
# 重新创建内核配置
grub2-mkconfig -o /boot/grub2/grub.cfg
# 查看系统中已有内核:
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /boot/grub2/grub.cfg
# 调整默认内核
grub2-set-default 0
# 开启BBR+fq
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
# 关闭selinux
vi /etc/sysconfig/selinux
SELINUX=disabled
# 重启
reboot
# 然后查看bbr状态
lsmod |grep bbr
sysctl net.ipv4.tcp_available_congestion_control
------------------------------------------------------------
# 显示所有内核
rpm -qa | grep kernel
# 最后,删除不能启动的内核以及旧内核
yum remove kernel-ml-5.5.7-1.el7.elrepo.x86_64
yum remove kernel-3.10.0-327.el7.x86_64
# 清理之后可能需要重新创建内核配置
grub2-mkconfig -o /boot/grub2/grub.cfg
# 其他
# 开启BBR+cake
echo "net.core.default_qdisc=cake" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
# 然后查看bbr状态
sysctl net.ipv4.tcp_available_congestion_controlerror
Error, Not found interfaces config.
mkdir /etc/network/interfaces.d echo "# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug ens3 iface ens3 inet dhcp " > /etc/network/interfaces