Centos8 升级 OpenSSH

1. 在国内镜像找到需要的版本号：阿里云

   cd /usr/local/src
   sudo wget https://mirrors.aliyun.com/pub/OpenBSD/OpenSSH/portable/openssh-9.8p1.tar.gz

2. 解压文件夹

   sudo tar zxvf openssh-9.8p1.tar.gz
   sudo rm openssh-9.8p1.tar.gz 

3. 安装依赖

   sudo yum install pam-devel krb5-devel zlib-devel openssl-devel

4. --help查看相关支持 ./configure 进行配置

   cd openssh-9.8p1/
   ./configure --help
   # sysconfdir 修改默认配置文件夹 --prefix修改文件安装目录
   ./configure --prefix=/usr/local/openssh9.8 --sysconfdir=/etc/ssh --with-pam --with-kerberos5

5. 备份相关文件夹和文件防止升级失败

   sudo mv /etc/ssh /etc/ssh.bak
   sudo mv /usr/sbin/sshd /usr/sbin/sshd.bak
   sudo mv /usr/bin/ssh /usr/bin/ssh.bak
   sudo mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen.bak
   sudo mv /lib/systemd/system/sshd.service /lib/systemd/system/sshd.service-bak 

6. 编译安装、复制文件、参考就配置、修改新配置

   sudo make
   sudo make install
   sudo cp -rf /usr/local/openssh9.8/sbin/sshd /usr/sbin/sshd
   sudo cp -rf /usr/local/openssh9.8/bin/ssh /usr/bin/ssh 
   sudo cp -rf /usr/local/openssh9.8/bin/ssh-keygen /usr/bin/ssh-keygen
   sudo cat /etc/ssh.bak/sshd_config 
   sudo vim /etc/ssh/sshd_config 

7. 重启服务

   sudo systemctl stop sshd.service
   sudo systemctl daemon-reload
   sodo cp /usr/local/src/openssh-9.8p1/contrib/redhat/sshd.init /etc/init.d/sshd
   /etc/init.d/sshd restart
   sudo /etc/init.d/sshd restart

8. 另开窗口检测是否能顺利链接

   ssh xxx@xxx

9. 配置开机启动

   sudo systemctl status sshd
   sudo chkconfig --add  sshd
   sudo chkconfig --list sshd

10. 命令行检测是否成功

    ssh -V
    sshd -V