「CentOS」- 安装与升级

# 升级系统
yum update -y

# 添加 ELRepo 仓库
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

# 查看可用内核版本
yum list available --disablerepo='*' --enablerepo=elrepo-kernel

# 安装新内核
yum remove -y kernel-headers kernel-tools kernel-tools-libs
yum --enablerepo="elrepo-kernel" install -y kernel-ml kernel-ml-devel \
    kernel-ml-headers kernel-ml-tools kernel-ml-tools-libs kernel-ml-tools-libs-devel

# 重新启动系统，并手动选择内核版本，验证功能
# 略……

# 设置默认内核版本
grub2-set-default 0
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

# 以 virtio-net.ko 模块为例
cat > /etc/modules-load.d/virtio-net.conf <<EOF
# Load virtio-net.ko at boot
virtio-net
EOF

# 以 Bonding 模块为例：
cat > /etc/sysconfig/modules/bonding.modules <<EOF
#!/bin/sh
exec /sbin/modprobe bonding 2>&1
EOF

chmod 755 /etc/sysconfig/modules/bonding.modules

# date '+%Z %z'
CST +0800

ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

# 取消「You have mail in /var/spool/mail/root」提示
echo 'unset MAILCHECK'  >> ~/.bashrc

# 调整 PS1 变量
cat >> ~/.bashrc  <<EOF
export PS1="\e[01;31m\u@\h \w\e[00m""\e[34;1m\e[0m""\n""prod-master # "

# 常用命令别名
alias ll='ls -l -a --color'
alias ls='ls -a --color'
EOF

# 重新登录一下
exec su - root

# 每次安装完 CentOS 之后，执行如下命令：
yum install -y epel-release                                                    \
    && yum install -y yum-cron yum-utils yum-cron                              \
    && yum install -y sysstat procps-ng psmisc bash-completion tmux vim rsync wget

yum update -y

#!/bin/sh

# 配置源
cat <<UA >> /etc/yum.repos.d/upgrade.repo
[upgrade]
name=upgrade
baseurl=https://buildlogs.centos.org/centos/6/upg/old/x86_64/
enabled=1
gpgcheck=0
UA

# 对 openscap 进行降级
# 因为一个错误：https://centos.org/forums/viewtopic.php?t=59763
yum erase openscap
yum -y install https://buildlogs.centos.org/centos/6/upg/x86_64/Packages/openscap-1.0.8-1.0.1.el6.centos.x86_64.rpm

# 安装升级助手
yum -y install redhat-upgrade-tool preupgrade-assistant-*

# 执行检查
preupg --text

#!/bin/sh

# 如果链接无效，则访问 http://centos.excellmedia.net/ 找到对应的文件，修改链接即可
# rpm --import http://centos.excellmedia.net/7.6.1810/os/x86_64/RPM-GPG-KEY-CentOS-7
# redhat-upgrade-tool --network 7.6 --force --instrepo http://centos.excellmedia.net/7.6.1810/os/x86_64/
rpm --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7
centos-upgrade-tool-cli --network 7 --instrepo=http://mirror.centos.org/centos/7/os/x86_64

# 上述命令执行结束后，需要在重启后进行安装
reboot

#!/bin/sh

cat /etc/redhat-release