一、环境准备

yum -y install wget tar gcc make

二、上传升级的软件包

zlib-1.2.11.tar.gz，openssl-1.1.1d .tar.gz，openssh-9.0p1.tar.gz
下载地址：

zlib：
官网http://www.zlib.net/
wget https://nchc.dl.sourceforge.net/project/libpng/zlib/1.2.11/zlib-1.2.11.tar.gz
openssl：
wget https://www.openssl.org/source/openssl-1.1.1d.tar.gz
openssh：
https://mirrors.sonic.net/pub/OpenBSD/OpenSSH/portable/

上传到服务器并解压
三、安装libz

cd zlib-1.2.11
./configure --prefix=/usr/local/zlib
make && make install

四、安装openssl

cd openssl-1.1.1d
./config --prefix=/usr/local/ssl -d shared
make && make install
echo '/usr/local/ssl/lib' >> /etc/ld.so.conf
ldconfig -v

五、安装openssh-9.0

cd openssh-9.0
./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl
make && make install

六、卸载yum安装的openssh

yum remove openssh

七、修改配置
启动前要将新生成的sshd_config修改以下几个地方

vim /usr/local/openssh/etc/sshd_config
PermitRootLogin yes
PubkeyAuthentication yes
PasswordAuthentication yes

复制文件到相应的系统文件夹

[root@pig4cloud openssh-9.0p1]# cd /usr/local/src/openssh-9.0p1/contrib/redhat
[root@pig4cloud redhat]# cp sshd.init  /etc/init.d/sshd 
[root@pig4cloud redhat]# chkconfig --add sshd
[root@pig4cloud redhat]# cp /usr/local/openssh/etc/sshd_config /etc/ssh/sshd_config
[root@pig4cloud redhat]# cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd
[root@pig4cloud redhat]# cp /usr/local/openssh/bin/ssh /usr/bin/ssh
[root@pig4cloud redhat]# cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen
[root@pig4cloud redhat]# cp /usr/local/openssh/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub

[root@pig4cloud redhat]#

重启sshd服务

systemctl start sshd.service
#查看版本
[root@pig4cloud redhat]# ssh -V
OpenSSH_9.0p1, OpenSSL 1.1.1d  10 Sep 2019