[Nginx]nginx的除錯筆記

前言

我一直對nginx不太熟，
目前也只到了會用，大部分的指令看得懂。
但湊在一起，還是要查一下。

這次的錯誤就發生在我以為的問題上

正文

又多了一個新服務要架設，
所以想當然，東西又丟到我這來了。
這次跟以前的比較不一樣，這次是一個全新的服務。
所以之前的自動佈署、yaml、nginx設定檔通通重來。
雖然說是重來，但也只是複製貼上改一改，然後就炸了XDDDD

我複製之前的設定檔像這個樣子。中間刪除了很多東西，
請不要照抄。

server_tokens off;
log_format  client  '$remote_addr - $remote_user [$time_local] , '
                  'http-host: "$http_host" , URL: "$request"  , request-status : "$status"  ,   '
                  'body-byte: $body_bytes_sent  ,http-referer: "$http_referer"  ,'
                  'user-agent: "$http_user_agent" , X-Forwarded-For : "$http_x_forwarded_for" ,  '
                  ' request-time: "$request_time"  , response_time : "$upstream_response_time"  ';

client_max_body_size 100m;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_comp_level 5;
gzip_types text/plain text/css application/x-javascript application/javascript application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png;

# GCP HTTP(S) LoadBalancer will add Via, but nginx check it to disable compress by default...
gzip_proxied any;
gzip_vary on;

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    access_log  /dev/stdout   client;
      error_log /dev/stderr;
        
    index index.html index.htm;
    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }
      

    location /api/socket.io/ {
        proxy_pass http://rd5-api;
        proxy_set_header Host $host;
        proxy_set_header token $rd5_token;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        # proxy_set_header X-NginX-Proxy true;
        proxy_set_header X-Real-IP $remote_addr;
        # proxy_set_header via 'proxy_pass/token-proxy ws';
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_read_timeout 1d;
        
    }

    location /50x.html {
        root /usr/share/nginx/html/frontend-client/;
        internal;
    }
    location /healthz {
        access_log off;
        return 200 'ok';
    }

    location / {
        error_page 418 = @fjysdz;
        recursive_error_pages on;

        if ($host = 'yb-test.fjysdz.cn') {
           return 418;
        }
        rewrite "^(.*)\$" $1 permanent; # 去除url尾部重複斜線
        root /usr/share/nginx/html/frontend-client/$dir;
        add_header via frontend-proxy;
        try_files $uri $uri/ /index.html /index.htm =404;
    }



}

然後就出現錯誤了

“server_tokens” directive is not allowed here

我百思不得其解，我明明是照抄的怎麼會錯。
後來將server_tokens搬進去 server 的區塊內，好了能跑了。
但又爆出

“log_format” directive is not allowed here

我又只好在最外層加上http {} ，但心中一直有一個疑問，
為什麼會失敗！？

最後變成這樣

events {
     worker_connections 1024;
}
http {

log_format  client  '$remote_addr - $remote_user [$time_local] , '
                  'http-host: "$http_host" , URL: "$request"  , request-status : "$status"  ,   '
                  'body-byte: $body_bytes_sent  ,http-referer: "$http_referer"  ,'
                  'user-agent: "$http_user_agent" , X-Forwarded-For : "$http_x_forwarded_for" ,  '
                  ' request-time: "$request_time"  , response_time : "$upstream_response_time"  ';

client_max_body_size 100m;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_comp_level 5;
gzip_types text/plain text/css application/x-javascript application/javascript application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png;

# GCP HTTP(S) LoadBalancer will add Via, but nginx check it to disable compress by default...
gzip_proxied any;
gzip_vary on;

server {

    server_tokens off;
    listen 80 default_server;
    listen [::]:80 default_server;
    access_log  /dev/stdout   client;
      error_log /dev/stderr;
        
    index index.html index.htm;
    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }
      
    location /conf/domain {
       access_log off;
        default_type application/json;
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET';
        return 200 '{"domain":"500015", "site": "porn1" ,"cdn":"x-cdn-yb"}';
    }

    # frontend-client
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location /404.html {
        root /usr/share/nginx/html/frontend-client/;
        internal;
    }
    location /50x.html {
        root /usr/share/nginx/html/frontend-client/;
        internal;
    }
    location /healthz {
        access_log off;
        return 200 'ok';
    }

    location / {
        rewrite "^(.*)\$" $1 permanent; # 去除url尾部重複斜線
        root /usr/share/nginx/html/$dir;
        add_header via frontend-proxy;
        try_files $uri $uri/ /index.html /index.htm =404;
    }


}


}

跑是能正常跑了，但頁面載入一直出問題，
因為nginx log正常了，就聯絡前端同仁幫看一下。
他說從伺服器取得的css context-type有問題。
查了一下，又發現一個東西沒帶。

include /etc/nginx/mime.types;

為什麼一個能跑一個不能跑？？？
最後發現一個重點。

結論

Nginx 的設定檔預設的位置是

/etc/nginx/nginx.conf

然後，這個檔案裡面會先寫好預設的設定。

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
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  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

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

所以能跑的服務，是因為他的設定檔放在 conf.d 裡面，
所以是從 nginx.conf載入 /etc/nginx/conf.d/*.conf 的設定。

而不能跑的服務，我是將設定檔直接覆蓋 /etc/nginx/nginx.conf ，
所以上面那一些設定我都沒寫到。

ref.

• nginx中CSS重定向解析有問題——mime.type詳解
• Nginx筆記（二）Nginx基礎