httpd.service - The Apache HTTP Server
? Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
? Active: failed (Result: exit-code) since 四 2018-07-12 07:09:13 CST; 5s ago
? ? Docs: man:httpd(8)
? ? ? ? ? man:apachectl(8)
? Process: 2913 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
? Process: 2909 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Main PID: 2909 (code=exited, status=1/FAILURE)
7月 12 07:09:13 centos httpd[2909]: (13)Permission denied: AH00072: make_sock: could not b...085
7月 12 07:09:13 centos httpd[2909]: (13)Permission denied: AH00072: make_sock: could not b...085
7月 12 07:09:13 centos httpd[2909]: no listening sockets available, shutting down
7月 12 07:09:13 centos httpd[2909]: AH00015: Unable to open logs
7月 12 07:09:13 centos systemd[1]: httpd.service: main process exited, code=exited, statu...LURE
7月 12 07:09:13 centos kill[2913]: kill: cannot find process ""
7月 12 07:09:13 centos systemd[1]: httpd.service: control process exited, code=exited status=1
7月 12 07:09:13 centos systemd[1]: Failed to start The Apache HTTP Server.
7月 12 07:09:13 centos systemd[1]: Unit httpd.service entered failed state.
7月 12 07:09:13 centos systemd[1]: httpd.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
解決辦法
semanage port -l|grep http
semanage port -a -t http_port_t -p tcp 81
修改/etc/selinux/config找到SELINUX=enforcing 修改為SELINUX=disable，然后reboot即可
