1.创建实例前，先创建ssh密钥对，只允许密钥对进行远程登录。具体见：https://help.aliyun.com/document_detail/51792.html?spm=5176.2020520101.193.1.CChOuj

2.配置自动快照策略，每日一备份，不过貌似现在这个功能开始收费了。具体：

3.安装安骑士进行服务器安全保护。具体：

4.配置主机访问控制，限制和允许ip访问特定端口。具体：

5.配置安全组，限制和允许ip访问特定端口，默认如下，表示无限制：

具体：

6.配置主机防火墙。具体：

# sample configuration for iptables service

# you can edit this manually or use system-config-firewall

# please do not ask us to add additional ports/services to this default configuration

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

#ssh default 222.209.0.0/21=222.209.0.0~222.209.8.0

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

#http default

-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT

# https default

-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

# ftp default

-A INPUT -p tcp -m state --state NEW -m tcp --dport 21 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# ftp passive

-A INPUT -p tcp -m state --state NEW -m tcp --dport 30000:40000 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# tomcat default jenkins

-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT

# my tomcat

-A INPUT -p tcp -m state --state NEW -m tcp --dport 8090 -j ACCEPT

# my tomcat wiki

-A INPUT -p tcp -m state --state NEW -m tcp --dport 8070 -j ACCEPT

# my tomcat debug

-A INPUT -p tcp -m state --state NEW -m tcp --dport 9999 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# svn default

-A INPUT -p tcp -m state --state NEW -m tcp --dport 3690 -j ACCEPT

# redis cluster

-A INPUT -p tcp -m state --state NEW -m tcp --dport 7001:7006 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# redis cluster total line

-A INPUT -p tcp -m state --state NEW -m tcp --dport 17001:17006 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# mysql default

-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -s 183.222.9.18,222.209.0.0/21,本服务器公网ip -j ACCEPT

# my udp

-A INPUT -p udp -m state --state NEW -m udp --dport 8888 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

注：183.222.9.18,222.209.0.0/21表示只允许ip大概222.209.0.0到222.209.8.0和183.222.9.18访问。21的子网掩码为：255.255.248.0，内有2048个主机。故从222.209.0.0往上加，满256进一，一直加完2048，截止的ip就是222.209.8.0

原文地址：https://blog.csdn.net/localhost01/article/details/78170615