openssh版本升级

1.准备openssh rpm包

openssh rpm包打包方法见另一篇博客

 

 

2.备份openssh配置

mkdir /etc/sshconfig_backup
cp /etc/ssh/sshd_config /etc/sshconfig_backup/
cp /etc/pam.d/sshd /etc/sshconfig_backup/pam.d_sshd

3.升级openssh

rpm -Uvh openssh*.rpm

4.还原ssh配置

cp /etc/sshconfig_backup/sshd_config /etc/ssh/sshd_config
cp /etc/sshconfig_backup/pam.d_sshd /etc/pam.d/sshd

5.配置root登录

并加上PermitRootLogin yes允许root用户登录
echo "PermitRootLogin yes"  >> /etc/ssh/sshd_config
cat /etc/ssh/sshd_config | grep PermitRootLogin

6.删除key

echo “删除/etc/ssh/目录下相关key文件，否则重启sshd服务会报错”
rm -rf /etc/ssh/ssh_host_*

7.重启ssh

service sshd restart