linux – Varnish“FetchError no backend connection”错误

概述Varnishlog： 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829925 1.0 12 SessionOpen c 79.124.74.11 3063 :80 12 SessionClose c EOF 12 StatSess c 79.124.74.11 3063 0 1 0 Varnishlog：

0 Cli          - Rd Ping    0 Cli          - Wr 200 19 PONG 1340829925 1.0   12 Sessionopen  c 79.124.74.11 3063 :80   12 SessionClose c EOF   12 StatSess     c 79.124.74.11 3063 0 1 0 0 0 0 0 0    0 Cli          - Rd Ping    0 Cli          - Wr 200 19 PONG 1340829928 1.0    0 Cli          - Rd Ping    0 Cli          - Wr 200 19 PONG 1340829931 1.0   12 Sessionopen  c 108.62.115.226 46211 :80   12 ReqStart     c 108.62.115.226 46211 467185881   12 RxRequest    c GET   12 RxURL        c /   12 RxProtocol   c http/1.0   12 Rxheader     c User-Agent: Pingdom.com_bot_version_1.4_(http://www.Pingdom.com/)   12 Rxheader     c Host: www.mysite.com   12 VCL_call     c recv lookup   12 VCL_call     c hash   12 Hash         c /   12 Hash         c www.mysite.com   12 VCL_return   c hash   12 VCL_call     c miss fetch   12 FetchError   c no backend connection   12 VCL_call     c error deliver   12 VCL_call     c deliver deliver   12 TxProtocol   c http/1.1   12 TxStatus     c 503   12 TxResponse   c Service Unavailable   12 Txheader     c Server: Varnish   12 Txheader     c Content-Type: text/HTML; charset=utf-8   12 Txheader     c Retry-After: 5   12 Txheader     c Content-Length: 418   12 Txheader     c Accept-Ranges: bytes   12 Txheader     c Date: Wed,27 Jun 2012 20:45:31 GMT   12 Txheader     c X-Varnish: 467185881   12 Txheader     c Age: 1   12 Txheader     c Via: 1.1 varnish   12 Txheader     c Connection: close   12 Length       c 418   12 ReqEnd       c 467185881 1340829931.192433119 1340829931.891024113 0.000051022 0.698516846 0.000074035   12 SessionClose c error   12 StatSess     c 108.62.115.226 46211 1 1 1 0 0 0 256 418    0 Cli          - Rd Ping    0 Cli          - Wr 200 19 PONG 1340829934 1.0    0 Cli          - Rd Ping    0 Cli          - Wr 200 19 PONG 1340829937 1.0

netstat -tlnp Active Internet connections (only servers)Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program nametcp        0      0 0.0.0.0:8080            0.0.0.0:*               ListEN      3086/Nginx      tcp        0      0 0.0.0.0:80              0.0.0.0:*               ListEN      1915/varnishd   tcp        0      0 0.0.0.0:22              0.0.0.0:*               ListEN      1279/sshd       tcp        0      0 127.0.0.2:25            0.0.0.0:*               ListEN      3195/sendmail: MTA:tcp        0      0 127.0.0.2:6082          0.0.0.0:*               ListEN      1914/varnishd   tcp        0      0 127.0.0.2:9000          0.0.0.0:*               ListEN      1317/PHP-fpm.conf)tcp        0      0 127.0.0.2:3306          0.0.0.0:*               ListEN      1192/MysqLd     tcp        0      0 127.0.0.2:587           0.0.0.0:*               ListEN      3195/sendmail: MTA:tcp        0      0 127.0.0.2:11211         0.0.0.0:*               ListEN      3072/memcached  tcp6       0      0 :::8080                 :::*                    ListEN      3086/Nginx      tcp6       0      0 :::80                   :::*                    ListEN      1915/varnishd   tcp6       0      0 :::22                   :::*                    ListEN      1279/sshd

在/ etc / Nginx的/启用站点/默认

server {    Listen   8080; ## Listen for ipv4; this line is default and implIEd    Listen   [::]:8080 default ipv6only=on; ## Listen for ipv6    root /usr/share/Nginx/www;    index index.HTML index.htm index.PHP;    # Make site accessible from http://localhost/    server_name localhost;    location / {        # First attempt to serve request as file,then        # as directory,then fall back to index.HTML        try_files $uri $uri/ /index.HTML;    }    location /doc {        root /usr/share;        autoindex on;        allow 127.0.0.2;        deny all;    }    location /images {        root /usr/share;        autoindex off;    }    #error_page 404 /404.HTML;    # redirect server error pages to the static page /50x.HTML    #    #error_page 500 502 503 504 /50x.HTML;    #location = /50x.HTML {    #   root /usr/share/Nginx/www;    #}    # proxy the PHP scripts to Apache Listening on 127.0.0.1:80    #    #location ~ \.PHP${    #   proxy_pass http://127.0.0.1;    #}    # pass the PHP scripts to FastCGI server Listening on 127.0.0.1:9000    #    location ~ \.PHP${        fastcgi_pass 127.0.0.2:9000;        fastcgi_index index.PHP;        include fastcgi_params;    }    # deny access to .htaccess files,if Apache's document root    # concurs with Nginx's one    #    #location ~ /\.ht {    #   deny all;    #}}

/etc/Nginx/sites-enabled/www.mysite.com.vhost

server {       Listen 8080;       server_name www.mysite.com mysite.com.net;       root /var/www/www.mysite.com/web;       if ($http_host != "www.mysite.com") {                 rewrite ^ http://www.mysite.com$request_uri permanent;       }       index index.PHP index.HTML;       location = /favicon.ico {                log_not_found off;                access_log off;       }       location = /robots.txt {                allow all;                log_not_found off;                access_log off;       }       # Deny all attempts to access hIDden files such as .htaccess,.htpasswd,.DS_Store (Mac).       location ~ /\. {                deny all;                access_log off;                log_not_found off;       }       location / {                try_files $uri $uri/ /index.PHP?$args;       }       # Add trailing slash to */wp-@R_419_5976@ requests.       rewrite /wp-@R_419_5976@$$scheme://$host$uri/ permanent;       location ~*  \.(jpg|jpeg|png|gif|CSS|Js|ico)${                expires max;                log_not_found off;       }       location ~ \.PHP${                try_files $uri =404;                include /etc/Nginx/fastcgi_params;                fastcgi_pass 127.0.0.2:9000;                fastcgi_param SCRIPT_filename $document_root$fastcgi_script_name;       }include /var/www/www.mysite.com/web/Nginx.conf;       location ~ /Nginx.conf {                deny all;                access_log off;                log_not_found off;       }}

/etc/varnish/default.vcl# This is a basic VCL configuration file for varnish.  See the vcl(7)# man page for details on VCL Syntax and semantics.# # Default backend deFinition.  Set this to point to your content# server.# backend default {    .host = "127.0.0.2";    .port = "8080";    # .connect_timeout = 600s;    #.first_byte_timeout = 600s;    # .between_bytes_timeout = 600s;    # .max_connections = 800;

注意：在default.vcl中取消注释最后四个选项没有任何区别.

cat / etc / default / varnish

# Configuration file for varnish## /etc/init.d/varnish expects the variables $DAEMON_OPTS,$NfileS and $MEmlock# to be set from this shell script fragment.## Should we start varnishd at boot?  Set to "yes" to enable.START=yes# Maximum number of open files (for ulimit -n)NfileS=131072# Maximum locked memory size (for ulimit -l)# Used for locking the shared memory log in memory.  If you increase log size,# you need to increase this number as wellMEmlock=82000# Default varnish instance name is the local nodename.  Can be overrIDden with# the -n switch,to have more instances on a single server.INSTANCE=$(uname -n)# This file contains 4 alternatives,please use only one.## Alternative 1,Minimal configuration,no VCL## Listen on port 6081,@R_419_5976@istration on localhost:6082,and forward to# content server on localhost:8080.  Use a 1GB fixed-size cache file.## DAEMON_OPTS="-a :6081 \#              -T localhost:6082 \#        -b localhost:8080 \#        -u varnish -g varnish \#            -S /etc/varnish/secret \#        -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G"## Alternative 2,Configuration with VCL## Listen on port 6081,and forward to# one content server selected by the vcl file,based on the request.  Use a 1GB# fixed-size cache file.#DAEMON_OPTS="-a :80 \             -T 127.0.0.2:6082 \             -f /etc/varnish/default.vcl \             -S /etc/varnish/secret \             -s file,1G"

如果您需要任何其他信息,请告诉我们.我完全不知道这个问题是什么.

curl header给了我这个：

curl -v -I -H "Testing: Test header so you see this works" http://www.mysite.com:8080* About to connect() to www.mysite.com port 8080 (#0)*   Trying 176.31.158.78... connected* Connected to www.mysite.com (176.31.158.78) port 8080 (#0)> head / http/1.1> User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5> Host: www.mysite.com:8080> Accept: */*> Testing: Test header so you see this works> < http/1.1 301 Moved Permanentlyhttp/1.1 301 Moved Permanently< Server: Nginx/1.0.5Server: Nginx/1.0.5< Date: Thu,28 Jun 2012 11:01:23 GMTDate: Thu,28 Jun 2012 11:01:23 GMT< Content-Type: text/HTMLContent-Type: text/HTML< Content-Length: 184Content-Length: 184< Connection: keep-aliveConnection: keep-alive< Location: http://www.mysite.com/Location: http://www.mysite.com/< * Connection #0 to host www.mysite.com left intact* Closing connection #0

解决方法 您应该尝试使用varnish用户登录并使用curl或wget测试连接到Nginx后端(127.0.0.2:8080)以确保它按预期工作.

正如cyberx86在评论中所说,SElinux(或任何其他安全模块如apparmor,grsec等)可能存在问题,不允许服务之间的连接,您还应检查审核日志以确保它不会发生在您的服务器中.

如果您的后端工作不正常(Nginx执行错误),您将遇到此类问题,请尝试直接访问后端并检查日志以确保所有内容都按预期运行(pax在评论中也告诉您) .

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