高手来瞅瞅， centos 下， nginx 安装后，修改日志路径，造成无法启动

高手们给看看啊，这个是报错内容

3 月 23 11:23:59 localhost.localdomain systemd[1]: Starting nginx - high performance web server...
3 月 23 11:23:59 localhost.localdomain nginx[30550]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
3 月 23 11:23:59 localhost.localdomain nginx[30550]: nginx: [emerg] open() "/home/www/log/error.log" failed (13: Permission denied)
3 月 23 11:23:59 localhost.localdomain nginx[30550]: nginx: configuration file /etc/nginx/nginx.conf test failed
3 月 23 11:23:59 localhost.localdomain systemd[1]: nginx.service: control process exited, code=exited status=1
3 月 23 11:23:59 localhost.localdomain systemd[1]: Failed to start nginx - high performance web server.
3 月 23 11:23:59 localhost.localdomain systemd[1]: Unit nginx.service entered failed state.
3 月 23 11:23:59 localhost.localdomain systemd[1]: nginx.service failed.

下面是 nginx.conf 文件内容

================== 配置文件==================== user apache;
worker_processes 1;

error_log /home/www/log/error.log warn;
pid /var/run/nginx.pid;

events {
worker_connections 1024;
}

http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /home/www/log/access.log main; sendfile on; #tcp_nopush on; keepalive_timeout 65; gzip on; include /etc/nginx/conf.d/*.conf; 

}

======================配置文件=========================

已知 /home/www/log 存在，并且属于 apche 用户名，用户组，为了测试权限，并且尝试给了 777 ，仍旧有问题

这个问题感觉装系统有时候会发生，有时候又没事，很奇怪， apache 也是，其他软件没遇到，感觉好奇怪。