1：环境：centos7
2：当在重启centos7 linux服务器后，再连接ftp客户端不能链接
此时需要检查以下几点：
2-1：核查ftp服务是否启动正常：
1 [root@localhost ~]# service vsftpd status 2 Redirecting to /bin/systemctl status vsftpd.service 3 ● vsftpd.service - Vsftpd ftp daemon 4 Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; enabled; vendor preset: disabled) 5 Active: active (running) since Fri 2017-08-25 09:20:59 CST; 30s ago 6 Process: 4517 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=0/SUCCESS) 7 Main PID: 4520 (vsftpd) 8 CGroup: /system.slice/vsftpd.service 9 └─4520 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf 10 11 Aug 25 09:20:59 localhost.localdomain systemd[1]: Starting Vsftpd ftp daemon... 12 Aug 25 09:20:59 localhost.localdomain systemd[1]: Started Vsftpd ftp daemon. 13
如果是ftp服务没有启动起来：则需要执行启动命令
1 service vsftpd restart
或者是设置ftp服务开机自动启动；如何设置请参考《CentOS7 搭建FTP服务器》的“七：解决 linux系统重启后 用ftp工具无法访问的问题”的内容
2-2:核查firewall防火墙是否启动正常：
1 [root@localhost ~]# systemctl status firewalld.service 2 ● firewalld.service - firewalld - dynamic firewall daemon 3 Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) 4 Active: active (running) since Fri 2017-08-25 09:00:20 CST; 25min ago 5 Docs: man:firewalld(1) 6 Main PID: 803 (firewalld) 7 CGroup: /system.slice/firewalld.service 8 └─803 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid 9 10 Aug 25 09:00:13 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon... 11 Aug 25 09:00:20 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon. 12
如果是firewall 服务没有启动起来，则需要手动启动
1 [root@localhost ~]# systemctl restart firewalld.service 2 #并核查下 启动的端口情况 3 [root@localhost ~]# firewall-cmd --zone=public --list-ports 4 80/tcp 8080/tcp 5 #如果没有自己想要的端口，则添加端口，然后在重启firewall 6 [root@localhost ~]# firewall-cmd --zone=public --add-port=21/tcp --permanent 7 success 8 [root@localhost ~]# systemctl restart firewalld.service 9 [root@localhost ~]# firewall-cmd --zone=public --list-ports 10 21/tcp 80/tcp 8080/tcp 11
2-3:核查iptables 的状态是否启动正常。
1 [root@localhost ~]# service iptables status 2 Redirecting to /bin/systemctl status iptables.service 3 ● iptables.service - IPv4 firewall with iptables 4 Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled; vendor preset: disabled) 5 Active: inactive (dead) 6 [root@localhost ~]# 7
如果 没有正常启动，则需要手动启动该服务。
1 [root@localhost ~]# service iptables restart 2
设置正常开机启动该服务：
1 [root@localhost ~]# cd /etc/rc.d 2 [root@localhost rc.d]# ls 3 init.d rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rc.local 4 [root@localhost rc.d]# cat rc.local 5 #!/bin/bash 6 # THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES 7 # 8 # It is highly advisable to create own systemd services or udev rules 9 # to run scripts during boot instead of using this file. 10 # 11 # In contrast to previous versions due to parallel execution during boot 12 # this script will NOT be run after all other services. 13 # 14 # Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure 15 # that this script will be executed during boot. 16 17 touch /var/lock/subsys/local 18 19 20 21 /etc/init.d/nginx start 22 [root@localhost rc.d]# vi rc.local 23
在rc.loal 文件中添加 service iptables restart 确定命令
以下是 红色标注的内容是 添加的启动iptables服务的内容
1 [root@localhost ~]# cd /etc/rc.d/ 2 [root@localhost rc.d]# ls 3 init.d rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rc.local 4 [root@localhost rc.d]# cat rc.local 5 #!/bin/bash 6 # THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES 7 # 8 # It is highly advisable to create own systemd services or udev rules 9 # to run scripts during boot instead of using this file. 10 # 11 # In contrast to previous versions due to parallel execution during boot 12 # this script will NOT be run after all other services. 13 # 14 # Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure 15 # that this script will be executed during boot. 16 17 touch /var/lock/subsys/local 18 19 20 #开机默认启动nginx服务 21 /etc/init.d/nginx start 22 #开机重启 ip 防火墙 23service iptables restart
24 [root@localhost rc.d]# 25
如果以上3个服务都启动正常，则ftp客户端连接应该是正常的。若还有问题，则需要仔细核查
