1.上传文件提示413 Request Entity Too Large错误

如果是用了nginx作为web服务器，并且上传的文件比较大时，需要修改nginx的最大上传限制。
1.修改 client_max_body_size 2000m;//#最大限制为2000M，
2.重启nginx（service nginx restart）

http {
    include       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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;
    client_max_body_size 2000m;//#最大限制为2000M
    #gzip  on;


include /etc/nginx/conf.d/*.conf;
}

2.您想要上传的文件可能太大了

1.修改/etc/php.ini upload_max_filesize、memory_limit、post_max_size 根据自己需求修改，
2.重启PHP（sudo service php-fpm restart）
; Maximum allowed size for uploaded files. 
; http://php.net/upload-max-filesize 
;upload_max_filesize = 2M 
upload_max_filesize = 300M

; Maximum amount of memory a script may consume (128MB) 
; http://php.net/memory-limit 
;memory_limit = 128M 
memory_limit = 300M

; Maximum size of POST data that PHP will accept. 
; http://php.net/post-max-size 
;post_max_size = 8M 
post_max_size = 300M