本地安装openssh---参考网络文档 https://www.cnblogs.com/libruce/p/18961920
备份原有配置
cp /etc/ssh/sshd_config /etc/ssh/sshd_config.backup
cp /etc/pam.d/sshd /etc/pam.d/sshd.backup
cp /etc/pam.d/system-auth /etc/pam.d/system-auth.backup
安装
sudo yum localinstall -y openssh-*.rpm
chmod 0600 /etc/ssh/ssh_host_rsa_key
chmod 0600 /etc/ssh/ssh_host_ecdsa_key
chmod 0600 /etc/ssh/ssh_host_ed25519_key
还原备份文件并注释79，80行，新版本已经弃用
mv /etc/ssh/sshd_config /etc/ssh/sshd_config.backupnew
mv /etc/pam.d/sshd /etc/pam.d/sshd.backupnew
mv /etc/pam.d/system-auth /etc/pam.d/system-auth.backupnew
cp /etc/ssh/sshd_config.backup /etc/ssh/sshd_config
cp /etc/pam.d/sshd.backup /etc/pam.d/sshd
cp /etc/pam.d/system-auth.backup /etc/pam.d/system-auth
sudo sed -i '79,80 s/^/#/' /etc/ssh/sshd_config
systemctl restart sshd
ssh -V