创建用户（1）adduser用户名（2）authorizegpasswd-atxwgsudoconfiguresudovisudo（找到rootALL=(ALL:ALL)ALLaddusernameALL=(ALL:ALL)ALL下面）增强服务器安全级别1.sudovi/etc/ssh/sshd_config修改端口port2。修改防火墙权限更新ubuntusudoapt-getupdate&&apt-getupgrade更新后清除防火墙规则iptable-F写入防火墙规则文件*filter#allowallconnections-AINPUT-mstate--stateESTABLISHED,RELATED-jACCEPT#allowouttraffic-AINPUT-jACCEPT#allowhttphttps-AINPUT-ptcp--dport443-jACCEPT-AINPUT-ptcp--dport4200-jACCEPT-AINPUT-ptcp--dport8081-jACCEPT#允许ssh端口登录-AINPUT-ptcp-mstate--stateNEW--dport6666-jACCEPT#ping-AINPUT-picmp-micmp--icmp-type8-jACCEPT#logdeniedcalls-AINPUT-mlimit--limit5/min-jLOG--log-prefix"iptablesdenied:"--log-level7#rejectallother-AINPUT-jREJECT-AINPUT-jREJECTCOMMIT调用防火墙rules(sudoiptables-restore
