前言
VMware-设置-网络适配器-桥接模式（复制物理……勾选），重启。
CentOS7-Minimal
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vi XXX # vim打开文件
i # 转入修改模式
Esc->:wq # 保存并退出
Esc->:q! # 不保存并退出
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cd /etc/sysconfig/network-scripts/
vi ifcfg-ens33
ONBOOT=yes
service network restart
yum install openssh-server net-tools -y
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有时ifconfig会失效，我们可以yum remove openssh-server net-tools -y，然后重新安装，重启虚拟机，即可解决问题。
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# 对于 CentOS 7
sudo sed -e 's|^mirrorlist=|#mirrorlist=|g' \
-e 's|^#baseurl=http://mirror.centos.org|baseurl=https://mirrors.bfsu.edu.cn|g' \
-i.bak \
/etc/yum.repos.d/CentOS-*.repo
sudo yum makecache
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yum install gcc gcc-c++ gcc-gfortran -y
yum install wget make gdb cmake git zip unzip bzip2 java-1.8.0-openjdk -y
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timedatectl set-timezone Asia/Shanghai # 设置系统时区为上海
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systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
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gedit /etc/sysconfig/selinux
SELINUX=disabled
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下面是错误示范，
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SELINUXTYPE=disabled #错误
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setenforce 0 #临时关闭SELinux
getenforce #查看SELinux状态
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yum -y update #升级所有包同时也升级软件和系统内核
yum -y upgrade #只升级所有包，不升级软件和系统内核
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备份原有仓库配置，
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mkdir /etc/yum.repos.d/backup
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/
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配置Vault仓库，
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cat > /etc/yum.repos.d/CentOS-Vault.repo <<EOF
[base]
name=CentOS-7 - Base
baseurl=http://vault.centos.org/centos/7.9.2009/os/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-7 - Updates
baseurl=http://vault.centos.org/centos/7.9.2009/updates/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-7 - Extras
baseurl=http://vault.centos.org/centos/7.9.2009/extras/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
EOF
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刷新缓存并检查仓库状态，
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yum clean all
yum makecache
yum repolist
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wget https://www.openssl.org/source/openssl-3.0.13.tar.gz
tar -xvzf openssl-3.0.13.tar.gz
cd openssl-3.0.13
./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl shared zlib
make
make install
openssl version
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wget https://curl.se/download/curl-8.5.0.tar.gz
tar -xzf curl-8.5.0.tar.gz
cd curl-8.5.0
make clean
./configure --prefix=/usr/local --with-openssl --with-libcurl=/usr/local LDFLAGS="-Wl,-rpath,/usr/local/lib"
make
make install
ldd /usr/local/bin/curl | grep libcurl
mv /usr/lib64/libcurl.so.4 /usr/lib64/libcurl.so.4.bak
mv /usr/lib/libcurl.so.4 /usr/lib/libcurl.so.4.bak
mv /usr/lib64/libcurl.so.4.3.0 /usr/lib64/libcurl.so.4.3.0.bak
mv /usr/lib/libcurl.so.4.3.0 /usr/lib/libcurl.so.4.3.0.bak
ln -s /usr/local/lib/libcurl.so.4.8.0 /usr/lib64/libcurl.so.4
ln -s /usr/local/lib/libcurl.so.4.8.0 /usr/lib/libcurl.so.4
ldconfig
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wget https://github.com/NixOS/patchelf/releases/download/0.17.2/patchelf-0.17.2.tar.gz
tar -xvzf patchelf-0.17.2.tar.gz
cd patchelf-0.17.2
./configure
make
make install
patchelf --set-rpath /usr/local/lib /usr/local/bin/curl
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CentOS7-LiveGNOME
在/etc/sysconfig/network-scripts内找不到ifcfg-ens33
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cp ifcfg-lo ifcfg-ens33
gedit ifcfg-ens33
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根据ifconfig命令修改ifcfg-ens33，
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DEVICE=ens33
NETMASK=255.255.255.0
BROADCAST=172.16.218.255
ONBOOT=yes
BOOTPROTO=static
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重启服务，
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service network restart
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若安装已停止维护的Centos，如何更新呢？
可以修改/etc/yum.repos.d/CentOS-Base.repo文件，将关键词centos换为centos-vault等。
