1.編譯安裝

tar -zxf openssh-7.4p1.tar.gz
cd openssh-7.4p1

./configure --prefix=/usr/local/openssh7.4/  --with-md5-passwords  --with-pam  --with-zlib  --with-privsep-path=/var/lib/sshd

make && make install

ln -s /usr/local/openssh7.4/ /usr/local/openssh

2.將原sshd啟動文件重命名

3.上傳新的腳本管理文件
cp contrib/redhat/sshd.init /etc/init.d/sshd
sshd文件內容修改成如下

# config: /usr/local/openssh/etc/ssh/ssh_host_key

    # config: /usr/local/openssh/etc/ssh/ssh_host_key.pub
    # config: /usr/local/openssh/etc/ssh/ssh_random_seed
    # config: /usr/local/openssh/etc/ssh/sshd_config

SSHD=/usr/local/openssh/sbin/sshd

/usr/local/openssh/bin/ssh-keygen -A

/sbin/restorecon /usr/local/openssh/etc/ssh/ssh_host_key.pub
/sbin/restorecon /usr/local/openssh/etc/ssh/ssh_host_rsa_key.pub
/sbin/restorecon /usr/local/openssh/etc/ssh/ssh_host_dsa_key.pub
/sbin/restorecon /usr/local/openssh/etc/ssh/ssh_host_ecdsa_key.pub
 

修改執行權限
chmod 755 /etc/init.d/sshd

4.修改PATH變量
.bash_profile
PATH=$PATH:/usr/local/openssh/sbin/:/usr/local/openssh/sbin/

5.修改配置文件
/usr/local/openssh/etc/sshd_config中添加
PermitRootLogin yes

6.重啟程序
此步關鍵不能出錯，否則將失去對服務器的連接（本身是通過ssh連接的）

    /etc/init.d/sshdold stop; /etc/init.d/sshd start
    Stopping sshd: [  OK  ]
    Starting sshd: [  OK  ]
 

7.驗證

    [root@server08 ~]# ps -ef|grep sshd
    root  24732  1  0 15:39 ?00:00:00 sshd: root@pts/1   
    root  33242  1  0 15:58 ?00:00:00 sshd: root@pts/2 
    root  33433  1  0 16:05 ?00:00:00 /usr/local/openssh/sbin/sshd
    root  33436  24734  0 16:05 pts/100:00:00 grep sshd

8.將原系統自帶的openssh包刪除

openssh升級到7.4p1