Openssh upgrade to 8.3 version history retention

   rpm -qa |grep openssh 
   vi /etc/ssh/sshd_config PasswordAuthentication yes PermitRootLogin yes 
   systemctl restart sshd to 
   
   install the telnet service, you can log in to the machine directly with telnet ip (you must use a normal user) to 
   prevent ssh upgrades from being unavailable and unable to log in to the machine 
   yum install -y telnet -server 
   yum install -y xinetd 
   systemctl start telnet.socket 
   systemctl start xinetd echo'pts 
   /0' >>/etc/securetty 
   echo'pts 
   /1' >>/etc/securetty systemctl restart telnet.socket 
   yum install telnet.x86_64 
   exit 
   useradd test 
   passwd test 
   exit 
   Find another machine to test whether telnet ip can log in normally 
   
   Download the openssl-8.3 installation package 
   cd /home/ 
   ll 
   mkdir sshpackage
   cd sshpackage/
   ll
   wget http://www.zlib.net/zlib-1.2.11.tar.gz
   wget https://www.openssl.org/source/openssl-1.1.1g.tar.gz
   wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.3p1.tar.gz
   ls -l
   rm -f openssh-8.3p1.tar.gz
   ll
   rz
   ll
   
   解压编译zlib-1.2.11
   tar zxf zlib-1.2.11.tar.gz 
   ll
   cd zlib-1.2.11/
   ./configure --prefix=/usr/local/zlib
   make && make install
   
   解压编译openssl-1.1.1g
   tar -xvf openssl-1.1.1g.tar.gz
   cd ..
   ll
   tar -xvf openssl-1.1.1g.tar.gz
   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 
   cd ..
   
   解压编译openssh-8.3p1
   tar -xvf openssh-8.3p1.tar.gz
   cd openssh-8.3p1/
   ./configure --prefix=/usr/local/openssh --with-ssl-dir=/usr/local/ssl --with-zlib=/usr/local/zlib
   make && make install
   
   修改配置
   vi  /usr/local/openssh/etc/sshd_config   PasswordAuthentication yes   PermitRootLogin yes
   
   备份升级替换ssh
   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 pubctl 
   restart 
   ssh -V After 
   
   everything is normal, log in again and close the telnet service 
   systemctl stop telnet.socket 
   systemctl stop xinetd