今天收到邮件才发现VPS到期被停用了o(╯□╰)o，赶紧地，去把费用续了，ssh到服务器发现，还好还好，文件都还在，不用重新装软件，不用重新clone仓库代码。不过发现我的wordpress博客没法用了（nginx + php-fpm + mysql），service nginx restart 没用，service mysqld restart 也没用，后来发现可能是php-fpm模块的问题。解决方案如下：
使用以下命令开启相关服务：
systemctl start nginx.service systemctl start php-fpm.service
然后让这两个服务开机自启：
systemctl enable nginx.service systemctl enable php-fpm.service
重启服务器，确认是否生效：
shutdown -r now
重新ssh登陆服务器后，systemctl list-units –type=service 查看运行的服务：
UNIT LOAD ACTIVE SUB DESCRIPTION acpid.service loaded active running ACPI Event Daemon atd.service loaded active running Job spooling tools auditd.service loaded active running Security Auditing Service crond.service loaded active running Command Scheduler dbus.service loaded active running D-Bus System Message Bus getty@tty1.service loaded active running Getty on tty1 httpd.service loaded failed failed The Apache HTTP Server kmod-static-nodes.service loaded active exited Create list of required static device nodes for the current kernel mysqld.service loaded active running MySQL Server network.service loaded active exited LSB: Bring up/down networking nginx.service loaded active running nginx - high performance web server ntpdate.service loaded active exited Set time via NTP php-fpm.service loaded active running The PHP FastCGI Process Manager postfix.service loaded active running Postfix Mail Transport Agent rhel-dmesg.service loaded active exited Dump dmesg to /var/log/dmesg rhel-readonly.service loaded active exited Configure read-only root support rsyslog.service loaded active running System Logging Service serial-getty@hvc0.service loaded active running Serial Getty on hvc0 sshd.service loaded active running OpenSSH server daemon systemd-fsck-root.service loaded active exited File System Check on Root Device systemd-journal-flush.service loaded active exited Flush Journal to Persistent Storage systemd-journald.service loaded active running Journal Service systemd-logind.service loaded active running Login Service systemd-random-seed.service loaded active exited Load/Save Random Seed systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems systemd-sysctl.service loaded active exited Apply Kernel Variables systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories systemd-udev-trigger.service loaded active exited udev Coldplug all Devices systemd-udevd.service loaded active running udev Kernel Device Manager systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown systemd-user-sessions.service loaded active exited Permit User Sessions
*注：请忽略上面启动失败的httpd.service服务，这个服务我暂时是不用的。
