配置 nginx 出错， nginx: [emerg] the size 10485760 of shared memory zone "limit" conflicts with already declared size 5242880

服务器：centos7，openresty，php7

配置按照的教程： https://segmentfault.com/a/1190000011299586

在执行命令：

/usr/local/openresty/nginx/sbin/nginx -t

出现了错误：

nginx: [emerg] the size 10485760 of shared memory zone "limit" conflicts with already declared size 52428800 in /usr/local/openresty/nginx/conf/nginx.conf:38 nginx: configuration file /usr/local/openresty/nginx/conf/nginx.conf test failed

请问如何 fix 这个错误？在哪里修改？请教大佬们，谢谢。

我执行的命令：

vim /usr/local/openresty/nginx/conf/nginx.conf

/usr/local/openresty/nginx/sbin/nginx -t

贴出目前自己的 nginx.conf：

user www; worker_processes 1;

#error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info;

#pid logs/nginx.pid;

events { worker_connections 1024; }

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; 

#WAF

lua_shared_dict limit 50m; #防 cc 使用字典，大小 50M lua_shared_dict guard_dict 100m; lua_shared_dict dict_captcha 70m; lua_max_running_timers 1; lua_package_path "/usr/local/openresty/nginx/conf/waf/?.lua"; init_by_lua_file "/usr/local/openresty/nginx/conf/waf/init.lua"; access_by_lua_file "/usr/local/openresty/nginx/conf/waf/access.lua"; lua_shared_dict limit 10m; #keepalive_timeout 0; keepalive_timeout 65; #gzip on; server { listen 80; server_name localhost; #charset koi8-r; #access_log logs/host.access.log main; location / { root html; index index.html index.htm index.php; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } # proxy the PHP scripts to Apache listening on 127.0.0.1:80 # #location ~ \.php$ { # proxy_pass http://127.0.0.1; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # #location ~ \.php$ { # root html; # fastcgi_pass 127.0.0.1:9000; # fastcgi_index index.php; # fastcgi_param SCRIPT_FILENAME /document_root$fastcgi_script_name; # include fastcgi_params; #} # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} } # another virtual host using mix of IP-, name-, and port-based configuration # #server { # listen 8000; # listen somename:8080; # server_name somename alias another.alias; # location / { # root html; # index index.html index.htm; # } #} # HTTPS server # #server { # listen 443 ssl; # server_name localhost; # ssl_certificate cert.pem; # ssl_certificate_key cert.key; 2,9 Top