openssh6.8升级参考指南(仅供参考，请自行测试)
务必开启telnet防止登不上
系统信息如下：
系统版本：Red Hat Enterprise Linux Server release 6.5 (Santiago) 64位
openssl和openssh版本OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
1.升级所需要的安装包
不同的环境需要不同的安装包，此次安装需要安装包如下 GCC环境所需的安装包： ppl-0.10.2-11.el6.x86_64.rpm cloog-ppl-0.15.7-1.2.el6.x86_64.rpm mpfr-2.4.1-6.el6.x86_64.rpm cpp-4.4.7-4.el6.x86_64.rpm gcc-4.4.7-4.el6.x86_64.rpm 编译安装openssl和openssh所需的安装包 zlib-devel-1.2.3-29.el6.x86_64.rpm pam-devel-1.1.1-17.el6.x86_64.rpm OpenSSH 升级所需安装包： openssl-1.0.0s.tar.gz
openssh-6.8p1.tar.gz 2.升级相关步骤
2.1安装GCC环境所需的安装包和相关软件包
[root@localhost opt]# rpm -ivh ppl-0.10.2-11.el6.x86_64.rpm [root@localhost opt]# rpm -ivh cloog-ppl-0.15.7-1.2.el6.x86_64.rpm [root@localhost opt]# rpm -ivh mpfr-2.4.1-6.el6.x86_64.rpm [root@localhost opt]# rpm -ivh cpp-4.4.7-4.el6.x86_64.rpm [root@localhost opt]# rpm -ivh gcc-4.4.7-4.el6.x86_64.rpm [root@localhost opt]# rpm -ivh zlib-devel-1.2.3-29.el6.x86_64.rpm [root@localhost opt]# rpm -ivh pam-devel-1.1.1-17.el6.x86_64.rpm 2.2卸载系统自带的openssh，同时清除系统/etc/ssh目录
备份openssh的配置文件
[root@localhost opt]#cp -r /etc/ssh /etc/ssh_bak
[root@localhost opt]# cp/etc/init.d/sshd /etc/init.d/sshd_bak [root@localhost opt]#cp/usr/sbin/sshd /usr/sbin/sshd_bak
[root@localhost opt]# rpm -qa | grepopenssh openssh-5.3p1-94.el6.x86_64 openssh-clients-5.3p1-94.el6.x86_64 openssh-server-5.3p1-94.el6.x86_64 openssh-askpass-5.3p1-94.el6.x86_64 [root@localhost opt]# rpm -e openssh-server [root@localhost opt]# rpm -e openssh-askpass [root@localhost opt]# rpm -e openssh-clients --nodeps [root@localhost opt]# rpm -e openssh [root@localhost ~]# rm -rf /etc/ssh 2.3 安装openssl [root@localhost opt]# tar -zxvf openssl-1.0.0s.tar.gz [root@localhost opt]# cd openssl-1.0.0s
[root@localhost openssl-1.0.0s]# ./config --prefix=/usr/local/openssl&& make && make install 2.4安装openssh
[root@localhost openssl-1.0.0s]# cd /opt
[root@localhost opt]# tar -zxvf openssh-6.8p1.tar.gz