2、解压升级包
tar --no-same-owner -zxvf zlib-1.2.11.tar.gz
tar --no-same-owner -zxvf openssh-8.3p1.tar.gz
tar --no-same-owner -zxvf openssl-1.1.1g.tar.gz
3、编译安装zlib

cd zlib-1.2.11
./configure --prefix=/usr/local/zlib
make && make install
4、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 
5、安装openssh

cd openssh-8.3p1
./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl
make && make install
6、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
7、备份原有文件，并将新的配置复制到指定目录

复制代码
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
复制代码
8、启动sshd

service sshd restart
9、查看信息版本

ssh -V
 10、升级完成后sftp登录后瞬间断开问题

修改/etc/ssh/sshd_config 文件中sftp路径，改为
Subsystem sftp /usr/libexec/sftp-server