nginx php post请求错误解决

nginx 日志报错如下：

[crit] 12#12: *286 open() "/var/tmp/nginx/client_body/0000000021" failed (13: Permission denied),

nginx配置文件中增加

http {
    # ...

    client_body_temp_path /tmp 1 2;
    client_body_buffer_size 256k;
    #client_body_in_file_only off;

    # ...
}