centos7 安装gitlab之后无法重启nginx，也无法停止
在 linode centos7 上安装gitlab-ce，安装之后默认的nginx被停止。
现在无法关闭gitlab自带的nginx，使用kill进程也是一样。
[root@linode nginx]# ps aux | grep nginx
root 4223 0.0 0.0 4188 792 ? Ss 21:53 0:00 runsv nginx
root 4224 0.0 0.0 4332 644 ? S 21:53 0:00 svlogd -tt /var/log/gitlab/nginx
root 4527 0.0 0.2 26888 4352 ? Ss 21:57 0:00 nginx: master process /opt/gitlab/embedded/sbin/nginx -p /var/opt/gitlab/nginx
gitlab-+ 4528 0.0 0.3 31140 7612 ? S 21:57 0:00 nginx: worker process
root 4918 0.0 0.1 112668 2272 pts/1 S+ 22:02 0:00 grep --color=auto nginx
[root@linode nginx]# [root@linode nginx]# systemctl status nginx
nginx.service - nginx - high performance web server
Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled)
Active: failed (Result: exit-code) since 二 2015-11-10 21:53:18 CST; 11min ago
Docs: http://nginx.org/en/docs/
Process: 4246 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)
Process: 4243 ExecStartPre=/usr/sbin/nginx -t -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
11月 10 21:53:15 linode nginx[4243]: nginx: configuration file /etc/nginx/nginx.conf test is successful
11月 10 21:53:15 linode nginx[4246]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
11月 10 21:53:16 linode nginx[4246]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
11月 10 21:53:16 linode nginx[4246]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
11月 10 21:53:17 linode nginx[4246]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
11月 10 21:53:17 linode nginx[4246]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
11月 10 21:53:18 linode nginx[4246]: nginx: [emerg] still could not bind()
11月 10 21:53:18 linode systemd[1]: nginx.service: control process exited, code=exited status=1
11月 10 21:53:18 linode systemd[1]: Failed to start nginx - high performance web server.
11月 10 21:53:18 linode systemd[1]: Unit nginx.service entered failed state.
[root@linode nginx]# 
