后端在不同主机上的 Varnish Config 503 错误
Varnish Config with backend on different host 503 error
我正在尝试设置清漆缓存，其中清漆实例托管在一台服务器上，后端位于另一台服务器上。它们都在 aws lightsail 实例上。我遇到的问题是当我尝试访问该站点时，我得到 Error 503 Backend fetch failed
错误。这是清漆 default.vcl:
# VCL version 5.0 is not supported so it should be 4.0 even though actually used Varnish version is 6
vcl 4.0;
import std;
# The minimal Varnish version is 6.0
# For SSL offloading, pass the following header in your proxy server or load balancer: 'SSL-OFFLOADED: https'
backend default {
.host = "172.26.4.151";
.port = "8080";
.first_byte_timeout = 600s;
.probe = {
.timeout = 2s;
.interval = 5s;
.window = 10;
.threshold = 5;
}
}
acl purge {
"localhost";
}
sub vcl_recv {
if (req.method == "PURGE") {
if (client.ip !~ purge) {
return (synth(405, "Method not allowed"));
}
# To use the X-Pool header for purging varnish during automated deployments, make sure the X-Pool header
# has been added to the response in your backend server config. This is used, for example, by the
# capistrano-magento2 gem for purging old content from varnish during it's deploy routine.
if (!req.http.X-Magento-Tags-Pattern && !req.http.X-Pool) {
return (synth(400, "X-Magento-Tags-Pattern or X-Pool header required"));
}
if (req.http.X-Magento-Tags-Pattern) {
ban("obj.http.X-Magento-Tags ~ " + req.http.X-Magento-Tags-Pattern);
}
if (req.http.X-Pool) {
ban("obj.http.X-Pool ~ " + req.http.X-Pool);
}
return (synth(200, "Purged"));
}
if (req.method != "GET" &&
req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
# We only deal with GET and HEAD by default
if (req.method != "GET" && req.method != "HEAD") {
return (pass);
}
# Bypass shopping cart, checkout and search requests
if (req.url ~ "/checkout" || req.url ~ "/catalogsearch") {
return (pass);
}
# Bypass health check requests
if (req.url ~ "/pub/health_check.php") {
return (pass);
}
# Set initial grace period usage status
set req.http.grace = "none";
# normalize url in case of leading HTTP scheme and domain
set req.url = regsub(req.url, "^http[s]?://", "");
# collect all cookies
std.collect(req.http.Cookie);
# Compression filter. See https://www.varnish-cache.org/trac/wiki/FAQ/Compression
if (req.http.Accept-Encoding) {
if (req.url ~ "\.(jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|swf|flv)$") {
# No point in compressing these
unset req.http.Accept-Encoding;
} elsif (req.http.Accept-Encoding ~ "gzip") {
set req.http.Accept-Encoding = "gzip";
} elsif (req.http.Accept-Encoding ~ "deflate" && req.http.user-agent !~ "MSIE") {
set req.http.Accept-Encoding = "deflate";
} else {
# unknown algorithm
unset req.http.Accept-Encoding;
}
}
# Remove all marketing get parameters to minimize the cache objects
if (req.url ~ "(\?|&)(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=") {
set req.url = regsuball(req.url, "(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=[-_A-z0-9+()%.]+&?", "");
set req.url = regsub(req.url, "[?|&]+$", "");
}
# Static files caching
if (req.url ~ "^/(pub/)?(media|static)/") {
# Static files should not be cached by default
return (pass);
# But if you use a few locales and don't use CDN you can enable caching static files by commenting previous line (#return (pass);) and uncommenting next 3 lines
#unset req.http.Https;
#unset req.http.SSL-OFFLOADED;
#unset req.http.Cookie;
}
return (hash);
}
sub vcl_hash {
if (req.http.cookie ~ "X-Magento-Vary=") {
hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", ""));
}
# For multi site configurations to not cache each other's content
if (req.http.host) {
hash_data(req.http.host);
} else {
hash_data(server.ip);
}
# To make sure http users don't see ssl warning
if (req.http.SSL-OFFLOADED) {
hash_data(req.http.SSL-OFFLOADED);
}
if (req.url ~ "/graphql") {
call process_graphql_headers;
}
}
sub process_graphql_headers {
if (req.http.Store) {
hash_data(req.http.Store);
}
if (req.http.Content-Currency) {
hash_data(req.http.Content-Currency);
}
}
sub vcl_backend_response {
set beresp.grace = 3d;
if (beresp.http.content-type ~ "text") {
set beresp.do_esi = true;
}
if (bereq.url ~ "\.js$" || beresp.http.content-type ~ "text") {
set beresp.do_gzip = true;
}
if (beresp.http.X-Magento-Debug) {
set beresp.http.X-Magento-Cache-Control = beresp.http.Cache-Control;
}
# cache only successfully responses and 404s
if (beresp.status != 200 && beresp.status != 404) {
set beresp.ttl = 0s;
set beresp.uncacheable = true;
return (deliver);
} elsif (beresp.http.Cache-Control ~ "private") {
set beresp.uncacheable = true;
set beresp.ttl = 86400s;
return (deliver);
}
# validate if we need to cache it and prevent from setting cookie
if (beresp.ttl > 0s && (bereq.method == "GET" || bereq.method == "HEAD")) {
unset beresp.http.set-cookie;
}
# If page is not cacheable then bypass varnish for 2 minutes as Hit-For-Pass
if (beresp.ttl <= 0s ||
beresp.http.Surrogate-control ~ "no-store" ||
(!beresp.http.Surrogate-Control &&
beresp.http.Cache-Control ~ "no-cache|no-store") ||
beresp.http.Vary == "*") {
# Mark as Hit-For-Pass for the next 2 minutes
set beresp.ttl = 120s;
set beresp.uncacheable = true;
}
return (deliver);
}
sub vcl_deliver {
if (resp.http.X-Magento-Debug) {
if (resp.http.x-varnish ~ " ") {
set resp.http.X-Magento-Cache-Debug = "HIT";
set resp.http.Grace = req.http.grace;
} else {
set resp.http.X-Magento-Cache-Debug = "MISS";
}
} else {
unset resp.http.Age;
}
# Not letting browser to cache non-static files.
if (resp.http.Cache-Control !~ "private" && req.url !~ "^/(pub/)?(media|static)/") {
set resp.http.Pragma = "no-cache";
set resp.http.Expires = "-1";
set resp.http.Cache-Control = "no-store, no-cache, must-revalidate, max-age=0";
}
unset resp.http.X-Magento-Debug;
unset resp.http.X-Magento-Tags;
unset resp.http.X-Powered-By;
unset resp.http.Server;
unset resp.http.X-Varnish;
unset resp.http.Via;
unset resp.http.Link;
}
sub vcl_hit {
if (obj.ttl >= 0s) {
# Hit within TTL period
return (deliver);
}
if (std.healthy(req.backend_hint)) {
if (obj.ttl + 300s > 0s) {
# Hit after TTL expiration, but within grace period
set req.http.grace = "normal (healthy server)";
return (deliver);
} else {
# Hit after TTL and grace expiration
return (restart);
}
} else {
# server is not healthy, retrieve from cache
set req.http.grace = "unlimited (unhealthy server)";
return (deliver);
}
}
后端服务器的私有 IP 地址为 172.26.4.151，正在侦听端口 8080。
这是后端主机的 nginx 配置：
## Example configuration:
upstream fastcgi_backend {
# use tcp connection
# server 127.0.0.1:9000;
# or socket
server unix:/var/run/php/php7.3-fpm.sock;
}
# server {
# listen 80;
# server_name mage.dev;
# set $MAGE_ROOT /var/www/magento2;
# set $MAGE_DEBUG_SHOW_ARGS 0;
# include /vagrant/magento2/nginx.conf.sample;
# }
#
## Optional override of deployment mode. We recommend you use the
## command 'bin/magento deploy:mode:set' to switch modes instead.
##
## set $MAGE_MODE default; # or production or developer
##
## If you set MAGE_MODE in server config, you must pass the variable into the
## PHP entry point blocks, which are indicated below. You can pass
## it in using:
##
## fastcgi_param MAGE_MODE $MAGE_MODE;
##
## In production mode, you should uncomment the 'expires' directive in the /static/ location block
# Modules can be loaded only at the very beginning of the Nginx config file, please move the line below to the main config file
# load_module /etc/nginx/modules/ngx_http_image_filter_module.so;
server {
listen 8080;
server_name example.com *.example.com;
set $MAGE_ROOT /var/www/html/example.com;
set $MAGE_DEBUG_SHOW_ARGS 0;
root $MAGE_ROOT/pub;
index index.php;
autoindex off;
charset UTF-8;
error_page 404 403 = /errors/404.php;
#add_header "X-UA-Compatible" "IE=Edge";
# Deny access to sensitive files
location /.user.ini {
deny all;
}
# PHP entry point for setup application
location ~* ^/setup($|/) {
root $MAGE_ROOT;
location ~ ^/setup/index.php {
fastcgi_pass fastcgi_backend;
fastcgi_param PHP_FLAG "session.auto_start=off \n suhosin.session.cryptua=off";
fastcgi_param PHP_VALUE "memory_limit=756M \n max_execution_time=600";
fastcgi_read_timeout 600s;
fastcgi_connect_timeout 600s;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
location ~ ^/setup/(?!pub/). {
deny all;
}
location ~ ^/setup/pub/ {
add_header X-Frame-Options "SAMEORIGIN";
}
}
# PHP entry point for update application
location ~* ^/update($|/) {
root $MAGE_ROOT;
location ~ ^/update/index.php {
fastcgi_split_path_info ^(/update/index.php)(/.+)$;
fastcgi_pass fastcgi_backend;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
include fastcgi_params;
}
# Deny everything but index.php
location ~ ^/update/(?!pub/). {
deny all;
}
location ~ ^/update/pub/ {
add_header X-Frame-Options "SAMEORIGIN";
}
}
location / {
try_files $uri $uri/ /index.php$is_args$args;
}
location /pub/ {
location ~ ^/pub/media/(downloadable|customer|import|custom_options|theme_customization/.*\.xml) {
deny all;
}
alias $MAGE_ROOT/pub/;
add_header X-Frame-Options "SAMEORIGIN";
}
location /static/ {
# Uncomment the following line in production mode
# expires max;
# Remove signature of the static files that is used to overcome the browser cache
location ~ ^/static/version\d*/ {
rewrite ^/static/version\d*/(.*)$ /static/ last;
}
location ~* \.(ico|jpg|jpeg|png|gif|svg|svgz|webp|avif|avifs|js|css|eot|ttf|otf|woff|woff2|html|json|webmanifest)$ {
add_header Cache-Control "public";
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
expires +1y;
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
}
location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
add_header Cache-Control "no-store";
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
expires off;
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
}
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
}
location /media/ {
## The following section allows to offload image resizing from Magento instance to the Nginx.
## Catalog image URL format should be set accordingly.
## See https://docs.magento.com/user-guide/configuration/general/web.html#url-options
# location ~* ^/media/catalog/.* {
#
# # Replace placeholders and uncomment the line below to serve product images from public S3
# # See examples of S3 authentication at https://github.com/anomalizer/ngx_aws_auth
# # resolver 8.8.8.8;
# # proxy_pass https://<bucket-name>.<region-name>.amazonaws.com;
#
# set $width "-";
# set $height "-";
# if ($arg_width != '') {
# set $width $arg_width;
# }
# if ($arg_height != '') {
# set $height $arg_height;
# }
# image_filter resize $width $height;
# image_filter_jpeg_quality 90;
# }
try_files $uri $uri/ /get.php$is_args$args;
location ~ ^/media/theme_customization/.*\.xml {
deny all;
}
location ~* \.(ico|jpg|jpeg|png|gif|svg|svgz|webp|avif|avifs|js|css|eot|ttf|otf|woff|woff2)$ {
add_header Cache-Control "public";
add_header X-Frame-Options "SAMEORIGIN";
add_header Access-Control-Allow-Origin *;
expires +1y;
try_files $uri $uri/ /get.php$is_args$args;
}
location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
add_header Cache-Control "no-store";
add_header X-Frame-Options "SAMEORIGIN";
expires off;
try_files $uri $uri/ /get.php$is_args$args;
}
add_header X-Frame-Options "SAMEORIGIN";
}
location /media/customer/ {
deny all;
}
location /media/downloadable/ {
deny all;
}
location /media/import/ {
deny all;
}
location /media/custom_options/ {
deny all;
}
location /errors/ {
location ~* \.xml$ {
deny all;
}
}
# PHP entry point for main application
location ~ ^/(index|get|static|errors/report|errors/404|errors/503|health_check)\.php$ {
set $cors_origin "*";
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*' always;
add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With,X-Cache-Hash' always;
### Tell client that this pre-flight info is valid for 20 days
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain charset=UTF-8';
add_header 'Content-Length' 0;
return 204;
}
add_header 'Access-Control-Allow-Origin' $cors_origin always;
try_files $uri =404;
fastcgi_pass fastcgi_backend;
fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;
fastcgi_param HTTPS on;
fastcgi_param PHP_FLAG "session.auto_start=off \n suhosin.session.cryptua=off";
fastcgi_param PHP_VALUE "memory_limit=756M \n max_execution_time=18000";
fastcgi_read_timeout 600s;
fastcgi_connect_timeout 600s;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
gzip on;
gzip_disable "msie6";
gzip_comp_level 6;
gzip_min_length 1100;
gzip_buffers 16 8k;
gzip_proxied any;
gzip_types
text/plain
text/css
text/js
text/xml
text/javascript
application/javascript
application/x-javascript
application/json
application/xml
application/xml+rss
image/svg+xml;
gzip_vary on;
# Banned locations (only reached if the earlier PHP entry point regexes don't match)
location ~* (\.php$|\.phtml$|\.htaccess$|\.git) {
deny all;
}
这是一个 magento 2 网站，但不确定在这种情况下是否相关。
我也有清漆日志：
* << BeReq >> 206
- Begin bereq 205 fetch
- VCL_use boot
- Timestamp Start: 1620340272.761062 0.000000 0.000000
- BereqMethod GET
- BereqURL /
- BereqProtocol HTTP/1.0
- BereqHeader Host: example.com
- BereqHeader X-Forwarded-Host: example.com
- BereqHeader X-Real-IP: 67.161.183.181
- BereqHeader Ssl-Offloaded: 1
- BereqHeader X-Forwarded-Proto: https
- BereqHeader X-Forwarded-Port: 443
- BereqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- BereqHeader sec-ch-ua-mobile: ?0
- BereqHeader Upgrade-Insecure-Requests: 1
- BereqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- BereqHeader Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
- BereqHeader Sec-Fetch-Site: none
- BereqHeader Sec-Fetch-Mode: navigate
- BereqHeader Sec-Fetch-User: ?1
- BereqHeader Sec-Fetch-Dest: document
- BereqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- BereqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- BereqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- BereqHeader grace: none
- BereqHeader Accept-Encoding: gzip
- BereqProtocol HTTP/1.1
- BereqHeader X-Varnish: 206
- VCL_call BACKEND_FETCH
- VCL_return fetch
- FetchError backend default: unhealthy
- Timestamp Beresp: 1620340272.761100 0.000038 0.000038
- Timestamp Error: 1620340272.761104 0.000042 0.000004
- BerespProtocol HTTP/1.1
- BerespStatus 503
- BerespReason Service Unavailable
- BerespReason Backend fetch failed
- BerespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- BerespHeader Server: Varnish
- VCL_call BACKEND_ERROR
- BerespHeader content-type: text/html; charset=utf-8
- BerespHeader Retry-After: 5
- VCL_return deliver
- Storage malloc Transient
- Length 280
- BereqAcct 0 0 0 0 0 0
- End
* << Request >> 205
- Begin req 204 rxreq
- Timestamp Start: 1620340272.760977 0.000000 0.000000
- Timestamp Req: 1620340272.760977 0.000000 0.000000
- VCL_use boot
- ReqStart 172.26.4.151 59894 a0
- ReqMethod GET
- ReqURL /
- ReqProtocol HTTP/1.0
- ReqHeader Host: example.com
- ReqHeader X-Forwarded-Host: example.com
- ReqHeader X-Real-IP: 67.161.183.181
- ReqHeader X-Forwarded-For: 67.161.183.181
- ReqHeader Ssl-Offloaded: 1
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-Port: 443
- ReqHeader Connection: close
- ReqHeader Cache-Control: max-age=0
- ReqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- ReqHeader sec-ch-ua-mobile: ?0
- ReqHeader Upgrade-Insecure-Requests: 1
- ReqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- ReqHeader Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
- ReqHeader Sec-Fetch-Site: none
- ReqHeader Sec-Fetch-Mode: navigate
- ReqHeader Sec-Fetch-User: ?1
- ReqHeader Sec-Fetch-Dest: document
- ReqHeader Accept-Encoding: gzip, deflate, br
- ReqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- ReqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- ReqUnset X-Forwarded-For: 67.161.183.181
- ReqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /
- ReqUnset Accept-Encoding: gzip, deflate, br
- ReqHeader Accept-Encoding: gzip
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- VCL_call MISS
- VCL_return fetch
- Link bereq 206 fetch
- Timestamp Fetch: 1620340272.761154 0.000177 0.000177
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 205
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.2)
- VCL_call DELIVER
- RespUnset Age: 0
- RespHeader Pragma: no-cache
- RespHeader Expires: -1
- RespHeader Cache-Control: no-store, no-cache, must-revalidate, max-age=0
- RespUnset Server: Varnish
- RespUnset X-Varnish: 205
- RespUnset Via: 1.1 varnish (Varnish/6.2)
- VCL_return deliver
- Timestamp Process: 1620340272.761174 0.000197 0.000020
- Filters
- RespHeader Content-Length: 280
- RespHeader Connection: close
- Timestamp Resp: 1620340272.761206 0.000229 0.000032
- ReqAcct 1300 0 1300 264 280 544
- End
* << Session >> 204
- Begin sess 0 HTTP/1
- SessOpen 172.26.4.151 59894 a0 172.26.8.97 6081 1620340272.760929 23
- Link req 205 rxreq
- SessClose REQ_CLOSE 0.000
- End
* << BeReq >> 32959
- Begin bereq 32958 fetch
- VCL_use boot
- Timestamp Start: 1620340272.920595 0.000000 0.000000
- BereqMethod GET
- BereqURL /favicon.ico
- BereqProtocol HTTP/1.0
- BereqHeader Host: example.com
- BereqHeader X-Forwarded-Host: example.com
- BereqHeader X-Real-IP: 67.161.183.181
- BereqHeader Ssl-Offloaded: 1
- BereqHeader X-Forwarded-Proto: https
- BereqHeader X-Forwarded-Port: 443
- BereqHeader Pragma: no-cache
- BereqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- BereqHeader sec-ch-ua-mobile: ?0
- BereqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- BereqHeader Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8
- BereqHeader Sec-Fetch-Site: same-origin
- BereqHeader Sec-Fetch-Mode: no-cors
- BereqHeader Sec-Fetch-Dest: image
- BereqHeader Referer: https://example.com/
- BereqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- BereqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- BereqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- BereqHeader grace: none
- BereqHeader Accept-Encoding: gzip
- BereqProtocol HTTP/1.1
- BereqHeader X-Varnish: 32959
- VCL_call BACKEND_FETCH
- VCL_return fetch
- FetchError backend default: unhealthy
- Timestamp Beresp: 1620340272.920635 0.000039 0.000039
- Timestamp Error: 1620340272.920639 0.000043 0.000004
- BerespProtocol HTTP/1.1
- BerespStatus 503
- BerespReason Service Unavailable
- BerespReason Backend fetch failed
- BerespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- BerespHeader Server: Varnish
- VCL_call BACKEND_ERROR
- BerespHeader content-type: text/html; charset=utf-8
- BerespHeader Retry-After: 5
- VCL_return deliver
- Storage malloc Transient
- Length 282
- BereqAcct 0 0 0 0 0 0
- End
nginx error.log 中没有显示任何错误，而 nginx access.log 仅显示以下内容：
[06/May/2021:22:52:44 +0000] "GET / HTTP/1.1" 503 280 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36"
Magento 日志也没有显示任何内容。
后台服务器8080端口也开放了
如果我不使用 varnish，该网站可以正常工作。不确定此时还需要检查或测试什么。
我在日志中发现了关键信息：
- FetchError backend default: unhealthy
问题不是后端在技术上不可用，而是健康检查探测失败。这意味着后端在管理上已关闭。
请运行以下命令确认：
varnishlog -g raw -i Backend_health
因为您没有在您的探测中指定 .url 选项，我假设主页将被检查。考虑到 2 秒超时，我也希望主页在超时开始前响应。
我看到您正在使用 Magento。使用 /pub/health_check.php 作为您的健康检查端点可能是个好主意。
我也在 https://magento.stackexchange.com/questions/324881/magento-2-4-varnish-error-503/325184#325184 中回答了一个关于 503 错误的类似问题。
请让我知道 varnishlog -g raw -i Backend_health 是否有帮助，如果您在 Nginx 日志中看到这些探测尝试。基于此，我们可以进一步调查。另请阅读有关 503 错误的相关主题。
我正在尝试设置清漆缓存，其中清漆实例托管在一台服务器上，后端位于另一台服务器上。它们都在 aws lightsail 实例上。我遇到的问题是当我尝试访问该站点时，我得到 Error 503 Backend fetch failed
错误。这是清漆 default.vcl:
# VCL version 5.0 is not supported so it should be 4.0 even though actually used Varnish version is 6
vcl 4.0;
import std;
# The minimal Varnish version is 6.0
# For SSL offloading, pass the following header in your proxy server or load balancer: 'SSL-OFFLOADED: https'
backend default {
.host = "172.26.4.151";
.port = "8080";
.first_byte_timeout = 600s;
.probe = {
.timeout = 2s;
.interval = 5s;
.window = 10;
.threshold = 5;
}
}
acl purge {
"localhost";
}
sub vcl_recv {
if (req.method == "PURGE") {
if (client.ip !~ purge) {
return (synth(405, "Method not allowed"));
}
# To use the X-Pool header for purging varnish during automated deployments, make sure the X-Pool header
# has been added to the response in your backend server config. This is used, for example, by the
# capistrano-magento2 gem for purging old content from varnish during it's deploy routine.
if (!req.http.X-Magento-Tags-Pattern && !req.http.X-Pool) {
return (synth(400, "X-Magento-Tags-Pattern or X-Pool header required"));
}
if (req.http.X-Magento-Tags-Pattern) {
ban("obj.http.X-Magento-Tags ~ " + req.http.X-Magento-Tags-Pattern);
}
if (req.http.X-Pool) {
ban("obj.http.X-Pool ~ " + req.http.X-Pool);
}
return (synth(200, "Purged"));
}
if (req.method != "GET" &&
req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
# We only deal with GET and HEAD by default
if (req.method != "GET" && req.method != "HEAD") {
return (pass);
}
# Bypass shopping cart, checkout and search requests
if (req.url ~ "/checkout" || req.url ~ "/catalogsearch") {
return (pass);
}
# Bypass health check requests
if (req.url ~ "/pub/health_check.php") {
return (pass);
}
# Set initial grace period usage status
set req.http.grace = "none";
# normalize url in case of leading HTTP scheme and domain
set req.url = regsub(req.url, "^http[s]?://", "");
# collect all cookies
std.collect(req.http.Cookie);
# Compression filter. See https://www.varnish-cache.org/trac/wiki/FAQ/Compression
if (req.http.Accept-Encoding) {
if (req.url ~ "\.(jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|swf|flv)$") {
# No point in compressing these
unset req.http.Accept-Encoding;
} elsif (req.http.Accept-Encoding ~ "gzip") {
set req.http.Accept-Encoding = "gzip";
} elsif (req.http.Accept-Encoding ~ "deflate" && req.http.user-agent !~ "MSIE") {
set req.http.Accept-Encoding = "deflate";
} else {
# unknown algorithm
unset req.http.Accept-Encoding;
}
}
# Remove all marketing get parameters to minimize the cache objects
if (req.url ~ "(\?|&)(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=") {
set req.url = regsuball(req.url, "(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=[-_A-z0-9+()%.]+&?", "");
set req.url = regsub(req.url, "[?|&]+$", "");
}
# Static files caching
if (req.url ~ "^/(pub/)?(media|static)/") {
# Static files should not be cached by default
return (pass);
# But if you use a few locales and don't use CDN you can enable caching static files by commenting previous line (#return (pass);) and uncommenting next 3 lines
#unset req.http.Https;
#unset req.http.SSL-OFFLOADED;
#unset req.http.Cookie;
}
return (hash);
}
sub vcl_hash {
if (req.http.cookie ~ "X-Magento-Vary=") {
hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", ""));
}
# For multi site configurations to not cache each other's content
if (req.http.host) {
hash_data(req.http.host);
} else {
hash_data(server.ip);
}
# To make sure http users don't see ssl warning
if (req.http.SSL-OFFLOADED) {
hash_data(req.http.SSL-OFFLOADED);
}
if (req.url ~ "/graphql") {
call process_graphql_headers;
}
}
sub process_graphql_headers {
if (req.http.Store) {
hash_data(req.http.Store);
}
if (req.http.Content-Currency) {
hash_data(req.http.Content-Currency);
}
}
sub vcl_backend_response {
set beresp.grace = 3d;
if (beresp.http.content-type ~ "text") {
set beresp.do_esi = true;
}
if (bereq.url ~ "\.js$" || beresp.http.content-type ~ "text") {
set beresp.do_gzip = true;
}
if (beresp.http.X-Magento-Debug) {
set beresp.http.X-Magento-Cache-Control = beresp.http.Cache-Control;
}
# cache only successfully responses and 404s
if (beresp.status != 200 && beresp.status != 404) {
set beresp.ttl = 0s;
set beresp.uncacheable = true;
return (deliver);
} elsif (beresp.http.Cache-Control ~ "private") {
set beresp.uncacheable = true;
set beresp.ttl = 86400s;
return (deliver);
}
# validate if we need to cache it and prevent from setting cookie
if (beresp.ttl > 0s && (bereq.method == "GET" || bereq.method == "HEAD")) {
unset beresp.http.set-cookie;
}
# If page is not cacheable then bypass varnish for 2 minutes as Hit-For-Pass
if (beresp.ttl <= 0s ||
beresp.http.Surrogate-control ~ "no-store" ||
(!beresp.http.Surrogate-Control &&
beresp.http.Cache-Control ~ "no-cache|no-store") ||
beresp.http.Vary == "*") {
# Mark as Hit-For-Pass for the next 2 minutes
set beresp.ttl = 120s;
set beresp.uncacheable = true;
}
return (deliver);
}
sub vcl_deliver {
if (resp.http.X-Magento-Debug) {
if (resp.http.x-varnish ~ " ") {
set resp.http.X-Magento-Cache-Debug = "HIT";
set resp.http.Grace = req.http.grace;
} else {
set resp.http.X-Magento-Cache-Debug = "MISS";
}
} else {
unset resp.http.Age;
}
# Not letting browser to cache non-static files.
if (resp.http.Cache-Control !~ "private" && req.url !~ "^/(pub/)?(media|static)/") {
set resp.http.Pragma = "no-cache";
set resp.http.Expires = "-1";
set resp.http.Cache-Control = "no-store, no-cache, must-revalidate, max-age=0";
}
unset resp.http.X-Magento-Debug;
unset resp.http.X-Magento-Tags;
unset resp.http.X-Powered-By;
unset resp.http.Server;
unset resp.http.X-Varnish;
unset resp.http.Via;
unset resp.http.Link;
}
sub vcl_hit {
if (obj.ttl >= 0s) {
# Hit within TTL period
return (deliver);
}
if (std.healthy(req.backend_hint)) {
if (obj.ttl + 300s > 0s) {
# Hit after TTL expiration, but within grace period
set req.http.grace = "normal (healthy server)";
return (deliver);
} else {
# Hit after TTL and grace expiration
return (restart);
}
} else {
# server is not healthy, retrieve from cache
set req.http.grace = "unlimited (unhealthy server)";
return (deliver);
}
}
后端服务器的私有 IP 地址为 172.26.4.151，正在侦听端口 8080。
这是后端主机的 nginx 配置：
## Example configuration:
upstream fastcgi_backend {
# use tcp connection
# server 127.0.0.1:9000;
# or socket
server unix:/var/run/php/php7.3-fpm.sock;
}
# server {
# listen 80;
# server_name mage.dev;
# set $MAGE_ROOT /var/www/magento2;
# set $MAGE_DEBUG_SHOW_ARGS 0;
# include /vagrant/magento2/nginx.conf.sample;
# }
#
## Optional override of deployment mode. We recommend you use the
## command 'bin/magento deploy:mode:set' to switch modes instead.
##
## set $MAGE_MODE default; # or production or developer
##
## If you set MAGE_MODE in server config, you must pass the variable into the
## PHP entry point blocks, which are indicated below. You can pass
## it in using:
##
## fastcgi_param MAGE_MODE $MAGE_MODE;
##
## In production mode, you should uncomment the 'expires' directive in the /static/ location block
# Modules can be loaded only at the very beginning of the Nginx config file, please move the line below to the main config file
# load_module /etc/nginx/modules/ngx_http_image_filter_module.so;
server {
listen 8080;
server_name example.com *.example.com;
set $MAGE_ROOT /var/www/html/example.com;
set $MAGE_DEBUG_SHOW_ARGS 0;
root $MAGE_ROOT/pub;
index index.php;
autoindex off;
charset UTF-8;
error_page 404 403 = /errors/404.php;
#add_header "X-UA-Compatible" "IE=Edge";
# Deny access to sensitive files
location /.user.ini {
deny all;
}
# PHP entry point for setup application
location ~* ^/setup($|/) {
root $MAGE_ROOT;
location ~ ^/setup/index.php {
fastcgi_pass fastcgi_backend;
fastcgi_param PHP_FLAG "session.auto_start=off \n suhosin.session.cryptua=off";
fastcgi_param PHP_VALUE "memory_limit=756M \n max_execution_time=600";
fastcgi_read_timeout 600s;
fastcgi_connect_timeout 600s;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
location ~ ^/setup/(?!pub/). {
deny all;
}
location ~ ^/setup/pub/ {
add_header X-Frame-Options "SAMEORIGIN";
}
}
# PHP entry point for update application
location ~* ^/update($|/) {
root $MAGE_ROOT;
location ~ ^/update/index.php {
fastcgi_split_path_info ^(/update/index.php)(/.+)$;
fastcgi_pass fastcgi_backend;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
include fastcgi_params;
}
# Deny everything but index.php
location ~ ^/update/(?!pub/). {
deny all;
}
location ~ ^/update/pub/ {
add_header X-Frame-Options "SAMEORIGIN";
}
}
location / {
try_files $uri $uri/ /index.php$is_args$args;
}
location /pub/ {
location ~ ^/pub/media/(downloadable|customer|import|custom_options|theme_customization/.*\.xml) {
deny all;
}
alias $MAGE_ROOT/pub/;
add_header X-Frame-Options "SAMEORIGIN";
}
location /static/ {
# Uncomment the following line in production mode
# expires max;
# Remove signature of the static files that is used to overcome the browser cache
location ~ ^/static/version\d*/ {
rewrite ^/static/version\d*/(.*)$ /static/ last;
}
location ~* \.(ico|jpg|jpeg|png|gif|svg|svgz|webp|avif|avifs|js|css|eot|ttf|otf|woff|woff2|html|json|webmanifest)$ {
add_header Cache-Control "public";
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
expires +1y;
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
}
location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
add_header Cache-Control "no-store";
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
expires off;
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
}
if (!-f $request_filename) {
rewrite ^/static/(version\d*/)?(.*)$ /static.php?resource= last;
}
add_header X-Frame-Options "SAMEORIGIN";
include /etc/nginx/magento2-cors.conf;
}
location /media/ {
## The following section allows to offload image resizing from Magento instance to the Nginx.
## Catalog image URL format should be set accordingly.
## See https://docs.magento.com/user-guide/configuration/general/web.html#url-options
# location ~* ^/media/catalog/.* {
#
# # Replace placeholders and uncomment the line below to serve product images from public S3
# # See examples of S3 authentication at https://github.com/anomalizer/ngx_aws_auth
# # resolver 8.8.8.8;
# # proxy_pass https://<bucket-name>.<region-name>.amazonaws.com;
#
# set $width "-";
# set $height "-";
# if ($arg_width != '') {
# set $width $arg_width;
# }
# if ($arg_height != '') {
# set $height $arg_height;
# }
# image_filter resize $width $height;
# image_filter_jpeg_quality 90;
# }
try_files $uri $uri/ /get.php$is_args$args;
location ~ ^/media/theme_customization/.*\.xml {
deny all;
}
location ~* \.(ico|jpg|jpeg|png|gif|svg|svgz|webp|avif|avifs|js|css|eot|ttf|otf|woff|woff2)$ {
add_header Cache-Control "public";
add_header X-Frame-Options "SAMEORIGIN";
add_header Access-Control-Allow-Origin *;
expires +1y;
try_files $uri $uri/ /get.php$is_args$args;
}
location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
add_header Cache-Control "no-store";
add_header X-Frame-Options "SAMEORIGIN";
expires off;
try_files $uri $uri/ /get.php$is_args$args;
}
add_header X-Frame-Options "SAMEORIGIN";
}
location /media/customer/ {
deny all;
}
location /media/downloadable/ {
deny all;
}
location /media/import/ {
deny all;
}
location /media/custom_options/ {
deny all;
}
location /errors/ {
location ~* \.xml$ {
deny all;
}
}
# PHP entry point for main application
location ~ ^/(index|get|static|errors/report|errors/404|errors/503|health_check)\.php$ {
set $cors_origin "*";
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*' always;
add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With,X-Cache-Hash' always;
### Tell client that this pre-flight info is valid for 20 days
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain charset=UTF-8';
add_header 'Content-Length' 0;
return 204;
}
add_header 'Access-Control-Allow-Origin' $cors_origin always;
try_files $uri =404;
fastcgi_pass fastcgi_backend;
fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;
fastcgi_param HTTPS on;
fastcgi_param PHP_FLAG "session.auto_start=off \n suhosin.session.cryptua=off";
fastcgi_param PHP_VALUE "memory_limit=756M \n max_execution_time=18000";
fastcgi_read_timeout 600s;
fastcgi_connect_timeout 600s;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
gzip on;
gzip_disable "msie6";
gzip_comp_level 6;
gzip_min_length 1100;
gzip_buffers 16 8k;
gzip_proxied any;
gzip_types
text/plain
text/css
text/js
text/xml
text/javascript
application/javascript
application/x-javascript
application/json
application/xml
application/xml+rss
image/svg+xml;
gzip_vary on;
# Banned locations (only reached if the earlier PHP entry point regexes don't match)
location ~* (\.php$|\.phtml$|\.htaccess$|\.git) {
deny all;
}
这是一个 magento 2 网站，但不确定在这种情况下是否相关。
我也有清漆日志：
* << BeReq >> 206
- Begin bereq 205 fetch
- VCL_use boot
- Timestamp Start: 1620340272.761062 0.000000 0.000000
- BereqMethod GET
- BereqURL /
- BereqProtocol HTTP/1.0
- BereqHeader Host: example.com
- BereqHeader X-Forwarded-Host: example.com
- BereqHeader X-Real-IP: 67.161.183.181
- BereqHeader Ssl-Offloaded: 1
- BereqHeader X-Forwarded-Proto: https
- BereqHeader X-Forwarded-Port: 443
- BereqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- BereqHeader sec-ch-ua-mobile: ?0
- BereqHeader Upgrade-Insecure-Requests: 1
- BereqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- BereqHeader Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
- BereqHeader Sec-Fetch-Site: none
- BereqHeader Sec-Fetch-Mode: navigate
- BereqHeader Sec-Fetch-User: ?1
- BereqHeader Sec-Fetch-Dest: document
- BereqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- BereqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- BereqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- BereqHeader grace: none
- BereqHeader Accept-Encoding: gzip
- BereqProtocol HTTP/1.1
- BereqHeader X-Varnish: 206
- VCL_call BACKEND_FETCH
- VCL_return fetch
- FetchError backend default: unhealthy
- Timestamp Beresp: 1620340272.761100 0.000038 0.000038
- Timestamp Error: 1620340272.761104 0.000042 0.000004
- BerespProtocol HTTP/1.1
- BerespStatus 503
- BerespReason Service Unavailable
- BerespReason Backend fetch failed
- BerespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- BerespHeader Server: Varnish
- VCL_call BACKEND_ERROR
- BerespHeader content-type: text/html; charset=utf-8
- BerespHeader Retry-After: 5
- VCL_return deliver
- Storage malloc Transient
- Length 280
- BereqAcct 0 0 0 0 0 0
- End
* << Request >> 205
- Begin req 204 rxreq
- Timestamp Start: 1620340272.760977 0.000000 0.000000
- Timestamp Req: 1620340272.760977 0.000000 0.000000
- VCL_use boot
- ReqStart 172.26.4.151 59894 a0
- ReqMethod GET
- ReqURL /
- ReqProtocol HTTP/1.0
- ReqHeader Host: example.com
- ReqHeader X-Forwarded-Host: example.com
- ReqHeader X-Real-IP: 67.161.183.181
- ReqHeader X-Forwarded-For: 67.161.183.181
- ReqHeader Ssl-Offloaded: 1
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-Port: 443
- ReqHeader Connection: close
- ReqHeader Cache-Control: max-age=0
- ReqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- ReqHeader sec-ch-ua-mobile: ?0
- ReqHeader Upgrade-Insecure-Requests: 1
- ReqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- ReqHeader Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
- ReqHeader Sec-Fetch-Site: none
- ReqHeader Sec-Fetch-Mode: navigate
- ReqHeader Sec-Fetch-User: ?1
- ReqHeader Sec-Fetch-Dest: document
- ReqHeader Accept-Encoding: gzip, deflate, br
- ReqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- ReqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- ReqUnset X-Forwarded-For: 67.161.183.181
- ReqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /
- ReqUnset Accept-Encoding: gzip, deflate, br
- ReqHeader Accept-Encoding: gzip
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- VCL_call MISS
- VCL_return fetch
- Link bereq 206 fetch
- Timestamp Fetch: 1620340272.761154 0.000177 0.000177
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 205
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.2)
- VCL_call DELIVER
- RespUnset Age: 0
- RespHeader Pragma: no-cache
- RespHeader Expires: -1
- RespHeader Cache-Control: no-store, no-cache, must-revalidate, max-age=0
- RespUnset Server: Varnish
- RespUnset X-Varnish: 205
- RespUnset Via: 1.1 varnish (Varnish/6.2)
- VCL_return deliver
- Timestamp Process: 1620340272.761174 0.000197 0.000020
- Filters
- RespHeader Content-Length: 280
- RespHeader Connection: close
- Timestamp Resp: 1620340272.761206 0.000229 0.000032
- ReqAcct 1300 0 1300 264 280 544
- End
* << Session >> 204
- Begin sess 0 HTTP/1
- SessOpen 172.26.4.151 59894 a0 172.26.8.97 6081 1620340272.760929 23
- Link req 205 rxreq
- SessClose REQ_CLOSE 0.000
- End
* << BeReq >> 32959
- Begin bereq 32958 fetch
- VCL_use boot
- Timestamp Start: 1620340272.920595 0.000000 0.000000
- BereqMethod GET
- BereqURL /favicon.ico
- BereqProtocol HTTP/1.0
- BereqHeader Host: example.com
- BereqHeader X-Forwarded-Host: example.com
- BereqHeader X-Real-IP: 67.161.183.181
- BereqHeader Ssl-Offloaded: 1
- BereqHeader X-Forwarded-Proto: https
- BereqHeader X-Forwarded-Port: 443
- BereqHeader Pragma: no-cache
- BereqHeader sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
- BereqHeader sec-ch-ua-mobile: ?0
- BereqHeader User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
- BereqHeader Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8
- BereqHeader Sec-Fetch-Site: same-origin
- BereqHeader Sec-Fetch-Mode: no-cors
- BereqHeader Sec-Fetch-Dest: image
- BereqHeader Referer: https://example.com/
- BereqHeader Accept-Language: en-US,en;q=0.9,es-ES;q=0.8,es;q=0.7
- BereqHeader Cookie: _ga=GA1.2.1802093982.1619119977; _gid=GA1.2.56339638.1620338153; form_key=djHykwYumX1hgtiw; mage-cache-storage=%7B%7D; mage-cache-storage-section-invalidation=%7B%7D; mage-messages=; recently_viewed_product=%7B%7D; recently_viewed_product_previou
- BereqHeader X-Forwarded-For: 67.161.183.181, 172.26.4.151
- BereqHeader grace: none
- BereqHeader Accept-Encoding: gzip
- BereqProtocol HTTP/1.1
- BereqHeader X-Varnish: 32959
- VCL_call BACKEND_FETCH
- VCL_return fetch
- FetchError backend default: unhealthy
- Timestamp Beresp: 1620340272.920635 0.000039 0.000039
- Timestamp Error: 1620340272.920639 0.000043 0.000004
- BerespProtocol HTTP/1.1
- BerespStatus 503
- BerespReason Service Unavailable
- BerespReason Backend fetch failed
- BerespHeader Date: Thu, 06 May 2021 22:31:12 GMT
- BerespHeader Server: Varnish
- VCL_call BACKEND_ERROR
- BerespHeader content-type: text/html; charset=utf-8
- BerespHeader Retry-After: 5
- VCL_return deliver
- Storage malloc Transient
- Length 282
- BereqAcct 0 0 0 0 0 0
- End
nginx error.log 中没有显示任何错误，而 nginx access.log 仅显示以下内容：
[06/May/2021:22:52:44 +0000] "GET / HTTP/1.1" 503 280 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36"
Magento 日志也没有显示任何内容。
后台服务器8080端口也开放了
如果我不使用 varnish，该网站可以正常工作。不确定此时还需要检查或测试什么。
我在日志中发现了关键信息：
- FetchError backend default: unhealthy
问题不是后端在技术上不可用，而是健康检查探测失败。这意味着后端在管理上已关闭。
请运行以下命令确认：
varnishlog -g raw -i Backend_health
因为您没有在您的探测中指定 .url 选项，我假设主页将被检查。考虑到 2 秒超时，我也希望主页在超时开始前响应。
我看到您正在使用 Magento。使用 /pub/health_check.php 作为您的健康检查端点可能是个好主意。
我也在 https://magento.stackexchange.com/questions/324881/magento-2-4-varnish-error-503/325184#325184 中回答了一个关于 503 错误的类似问题。
请让我知道 varnishlog -g raw -i Backend_health 是否有帮助，如果您在 Nginx 日志中看到这些探测尝试。基于此，我们可以进一步调查。另请阅读有关 503 错误的相关主题。