更新repo为国内镜像

更换yum源

mv /etc/yum.repos.d/CentOS-Base.repo{,.backup}
cat > /etc/yum.repos.d/CentOS-Base.repo << \EOF
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates 
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
EOF

sed -e 's|^mirrorlist=|#mirrorlist=|g' \
    -e 's|^#baseurl=http://mirror.centos.org/centos/|baseurl=https://mirrors.aliyun.com/centos/|g' \
    -i.bak \
    /etc/yum.repos.d/CentOS-Base.repo

yum clean all
yum makecache

添加EPEL库

yum install -y epel-release

sed -e 's|^metalink=|#metalink=|g' \
    -e 's|^#baseurl=https\?://download.fedoraproject.org/pub/epel/|baseurl=https://mirrors.ustc.edu.cn/epel/|g' \
    -e 's|^#baseurl=https\?://download.example/pub/epel/|baseurl=https://mirrors.ustc.edu.cn/epel/|g' \
    -i.bak \
    /etc/yum.repos.d/epel.repo

yum makecache fast

工具

yum install -y curl git lrzsz net-tools screen sysstat vim wget unzip zip yum-utils

Python3

yum install -y python3 python3-devel python3-pip
python3 -m pip install -i https://pypi.doubanio.com/simple/ -U pip setuptools
python3 -m pip config set global.index-url https://pypi.doubanio.com/simple/

JDK

yum install -y java-1.8.0-openjdk
java -version

docker

yum install -y yum-utils device-mapper-persistent-data lvm2

curl -o /etc/yum.repos.d/docker-ce.repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo
sed -i.bak 's|download.docker.com|mirrors.ustc.edu.cn/docker-ce|' /etc/yum.repos.d/docker-ce.repo

yum makecache fast
yum install -y docker-ce

mkdir -p /etc/docker && cat > /etc/docker/daemon.json << EOF
{
  "iptables": false,
  "registry-mirrors": [
    "https://dockerhub.azk8s.cn",
    "https://docker.mirrors.ustc.edu.cn",
    "https://d5eeyghy.mirror.aliyuncs.com",
    "https://reg-mirror.qiniu.com",
    "https://hub-mirror.c.163.com",
    "https://mirror.ccs.tencentyun.com",
    "https://dockerproxy.com",
    "https://registry.hub.docker.com",
    "https://docker.io"
  ]
}
EOF

systemctl --now enable docker

modprobe br_netfilter

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf

sysctl -p

安装ELRepo

最新稳定内核

# yum -y install yum-plugin-fastestmirror

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install -y https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm

#长期维护版:kernel-lt 最新稳定版:kernel-ml
yum install -y --enablerepo=elrepo-kernel kernel-lt kernel-lt-devel kernel-lt-headers

grub2-set-default 0

reboot

yum install -y --enablerepo=elrepo-kernel kernel-lt-tools kernel-lt-tools-libs kernel-lt-tools-libs-devel

查看可用内核版本及启动顺序

# BIOS
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /boot/grub2/grub.cfg

# UEFI
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /boot/efi/EFI/centos/grub.cfg

删除多余内核

cat << "EOF" > del_kernel.sh
detele_kernel(){
    release="centos"
    kernel_version=`uname -r | awk -F "-" '{print $1}'`
    rpm_total=`rpm -qa | grep kernel | grep -v "${kernel_version}" | grep -v "noarch" | wc -l`
    if [ "${rpm_total}" > "1" ]; then
        echo -e "检测到 ${rpm_total} 个其余内核，开始卸载..."
        for((integer = 1; integer <= ${rpm_total}; integer++)); do
            rpm_del=`rpm -qa | grep kernel | grep -v "${kernel_version}" | grep -v "noarch" | head -${integer}`
            echo -e "开始卸载 ${rpm_del} 内核..."
            rpm --nodeps -e ${rpm_del}
            echo -e "卸载 ${rpm_del} 内核卸载完成，继续..."
        done
        echo -e "内核卸载完毕，继续..."
    else
        echo -e " 检测到 内核 数量不正确，请检查 !" && exit 1
    fi
}
detele_kernel
EOF

bash del_kernel.sh