一.本机系统：
二.准备好依赖包
1.gcc
2.openssh
三. 在服务器上新建文件夹上传依赖包
四.安装
1) gcc
进入gcc 文件夹下执行命令
rpm -Uvh *.rpm --nodeps --force
验证是否安装成功
gcc -v
2）升级openSSh 到 openSSh_8.4p1
①解压升级包
tar -zxvf zlib-1.2.11.tar.gz -C /usr/local
tar -zxvf openssh-8.4p1.tar.gz -C /usr/local
tar -zxvf openssl-1.1.1g.tar.gz -C /usr/local
②编译安装zlib
cd zlib-1.2.11
./configure --prefix=/usr/local/zlib
make && make install
编译安装 openssl
cd openssl-1.1.1g
./config --prefix=/usr/local/ssl -d shared
make && make install
echo '/usr/local/ssl/lib' >> /etc/ld.so.conf
ldconfig -v
编译安装openssh
cd openssh-8.4p1
./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl
make && make install
sshd_config文件修改
echo'PermitRootLogin yes' >>/usr/local/openssh/etc/sshd_config
echo 'PubkeyAuthentication yes' >>/usr/local/openssh/etc/sshd_config
echo 'PasswordAuthentication yes' >>/usr/local/openssh/etc/sshd_config
备份原有文件，并将新的配置复制到指定目录
mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
cp /usr/local/openssh/etc/sshd_config /etc/ssh/sshd_config
mv /usr/sbin/sshd /usr/sbin/sshd.bak
cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd
mv /usr/bin/ssh /usr/bin/ssh.bak
cp /usr/local/openssh/bin/ssh /usr/bin/ssh
mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen.bak
cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen
mv /etc/ssh/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub.bak
cp /usr/local/openssh/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub
五.启动
systemctl daemon-reload
service sshd restart
查看版本ssh版本
ssh -V
六.问题
重启ssh服务出错
mkdir /etc/ssh_bak/
mv /usr/lib/systemd/system/sshd.service /etc/ssh_bak/
systemctl daemon-reload
systemctl restart sshd
systemctl status sshd
