503 Service unavailable Apache, Magento 2, Varnish, Redis
Question
i have a digitalocean droplet 1 click Magento 2 install that has Redis & Varnish, and because varnish uses port 80 so installing SSL is a little bit tricky, that i had to include http --http-01-port 8080 so it works, today was supposed to be the certificate renewal but it didn't auto renew and i received site not secured error, so i logged in to the server and i renewed the certificate using
certbot --force-renewal --http-01-port 8080 -d domainname.com,www.domainname.com
and the renewal is done, but after i did that i'm now receiving 503 Service unavailable with varnish disabled and with varnish enabled i receive Error 503 backend fetch failed
/etc/varnish/default.vcl
backend default {
.host = "localhost";
.port = "8080";
.first_byte_timeout = 600s;
.probe = {
.url = "/health_check.php";
.timeout = 2s;
.interval = 5s;
.window = 10;
.threshold = 5;
}
/etc/apache2/sites-enabled/000-default.conf
<VirtualHost 127.0.0.1:8080>
ServerAdmin webmaster@localhost
ServerName domainname.com
ServerAlias www.domainname.com
DocumentRoot /var/www/html/pub
<Directory /var/www/html/pub>
Options FollowSymLinks
AllowOverride All
Require all granted
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
SetEnvIf X-Forwarded-Proto https HTTPS=on
RewriteEngine on
RewriteCond %{SERVER_NAME} =domainname.com [OR]
RewriteCond %{SERVER_NAME} =www.domainname.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>
my apache error log shows
[Sun Sep 25 12:08:54.528941 2022] [proxy_http:error] [pid 51038] [client IP:19124] AH01114: HTTP: failed to make connection to backend: 127.0.0.1
the 503 error showing even in Phpmyadmin, so i guess this error has nothing to do with Magento
what could be the issue?
Edit:
sudo varnishlog -g request -q "RespStatus == 503"
* << Request >> 2
- Begin req 1 rxreq
- Timestamp Start: 1664111575.119591 0.000000 0.000000
- Timestamp Req: 1664111575.119591 0.000000 0.000000
- VCL_use boot
- ReqStart 127.0.0.1 7840 a0
- ReqMethod GET
- ReqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY3VzdG9tZXIvYWNjb3VudC9sb2dpblBvc3QvcmVmZXJlci9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WTIxekwyNXZjbTkxZEdVdmFXNWtaWGd2ZFdWdVl5OWhTRkl3WTBoTk5reDVPRE5sVjBab1lYazFhbUl5TU
- ReqProtocol HTTP/1.1
- ReqHeader Host: domain.com
- ReqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
- ReqHeader Accept-Encoding: gzip,deflate
- ReqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-For: 185.191.171.40
- ReqHeader X-Forwarded-Host: domain.com
- ReqHeader X-Forwarded-Server: domain.com
- ReqHeader Connection: Keep-Alive
- ReqUnset X-Forwarded-For: 185.191.171.40
- ReqHeader X-Forwarded-For: 185.191.171.40, 127.0.0.1
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY3VzdG9tZXIvYWNjb3VudC9sb2dpblBvc3QvcmVmZXJlci9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WTIxekwyNXZjbTkxZEdVdmFXNWtaWGd2ZFdWdVl5OWhTRkl3WTBoTk5reDVPRE5sVjBab1lYazFhbUl5TU
- ReqUnset Accept-Encoding: gzip,deflate
- ReqHeader Accept-Encoding: gzip
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- VCL_call MISS
- VCL_return fetch
- Link bereq 3 fetch
- Timestamp Fetch: 1664111575.120014 0.000422 0.000422
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Sun, 25 Sep 2022 13:12:55 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 2
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.4)
- 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: 2
- RespUnset Via: 1.1 varnish (Varnish/6.4)
- VCL_return deliver
- Timestamp Process: 1664111575.120075 0.000484 0.000061
- Filters
- RespHeader Content-Length: 278
- RespHeader Connection: keep-alive
- Timestamp Resp: 1664111575.120135 0.000544 0.000060
- ReqAcct 791 0 791 269 278 547
- End
** << BeReq >> 3
-- Begin bereq 2 fetch
-- VCL_use boot
-- Timestamp Start: 1664111575.119704 0.000000 0.000000
-- BereqMethod GET
-- BereqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY3VzdG9tZXIvYWNjb3VudC9sb2dpblBvc3QvcmVmZXJlci9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WTIxekwyNXZjbTkxZEdVdmFXNWtaWGd2ZFdWdVl5OWhTRkl3WTBoTk5reDVPRE5sVjBab1lYazFhbUl5TU
-- BereqProtocol HTTP/1.1
-- BereqHeader Host: domain.com
-- BereqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
-- BereqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
-- BereqHeader X-Forwarded-Proto: https
-- BereqHeader X-Forwarded-Host: domain.com
-- BereqHeader X-Forwarded-Server: domain.com
-- BereqHeader X-Forwarded-For: 185.191.171.40, 127.0.0.1
-- BereqHeader grace: none
-- BereqHeader Accept-Encoding: gzip
-- BereqHeader X-Varnish: 3
-- VCL_call BACKEND_FETCH
-- VCL_return fetch
-- FetchError backend default: unhealthy
-- Timestamp Beresp: 1664111575.119731 0.000027 0.000027
-- Timestamp Error: 1664111575.119732 0.000028 0.000000
-- BerespProtocol HTTP/1.1
-- BerespStatus 503
-- BerespReason Backend fetch failed
-- BerespHeader Date: Sun, 25 Sep 2022 13:12:55 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 278
-- BereqAcct 0 0 0 0 0 0
-- End
* << Request >> 5
- Begin req 4 rxreq
- Timestamp Start: 1664111597.397651 0.000000 0.000000
- Timestamp Req: 1664111597.397651 0.000000 0.000000
- VCL_use boot
- ReqStart 127.0.0.1 47420 a0
- ReqMethod GET
- ReqURL /robots.txt
- ReqProtocol HTTP/1.1
- ReqHeader Host: domain.com
- ReqHeader Accept: text/plain,text/html,*/*
- ReqHeader User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
- ReqHeader Accept-Encoding: gzip, deflate, br
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-For: 66.249.66.47
- ReqHeader X-Forwarded-Host: domain.com
- ReqHeader X-Forwarded-Server: domain.com
- ReqHeader Connection: Keep-Alive
- ReqUnset X-Forwarded-For: 66.249.66.47
- ReqHeader X-Forwarded-For: 66.249.66.47, 127.0.0.1
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /robots.txt
- 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 6 fetch
- Timestamp Fetch: 1664111597.397807 0.000156 0.000156
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Sun, 25 Sep 2022 13:13:17 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 5
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.4)
- 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: 5
- RespUnset Via: 1.1 varnish (Varnish/6.4)
- VCL_return deliver
- Timestamp Process: 1664111597.397819 0.000167 0.000011
- Filters
- RespHeader Content-Length: 278
- RespHeader Connection: keep-alive
- Timestamp Resp: 1664111597.397856 0.000205 0.000037
- ReqAcct 342 0 342 269 278 547
- End
** << BeReq >> 6
-- Begin bereq 5 fetch
-- VCL_use boot
-- Timestamp Start: 1664111597.397716 0.000000 0.000000
-- BereqMethod GET
-- BereqURL /robots.txt
-- BereqProtocol HTTP/1.1
-- BereqHeader Host: domain.com
-- BereqHeader Accept: text/plain,text/html,*/*
-- BereqHeader User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
-- BereqHeader X-Forwarded-Proto: https
-- BereqHeader X-Forwarded-Host: domain.com
-- BereqHeader X-Forwarded-Server: domain.com
-- BereqHeader X-Forwarded-For: 66.249.66.47, 127.0.0.1
-- BereqHeader grace: none
-- BereqHeader Accept-Encoding: gzip
-- BereqHeader X-Varnish: 6
-- VCL_call BACKEND_FETCH
-- VCL_return fetch
-- FetchError backend default: unhealthy
-- Timestamp Beresp: 1664111597.397732 0.000015 0.000015
-- Timestamp Error: 1664111597.397733 0.000016 0.000000
-- BerespProtocol HTTP/1.1
-- BerespStatus 503
-- BerespReason Backend fetch failed
-- BerespHeader Date: Sun, 25 Sep 2022 13:13:17 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 278
-- BereqAcct 0 0 0 0 0 0
-- End
* << Request >> 32770
- Begin req 32769 rxreq
- Timestamp Start: 1664111601.616549 0.000000 0.000000
- Timestamp Req: 1664111601.616549 0.000000 0.000000
- VCL_use boot
- ReqStart 127.0.0.1 47432 a0
- ReqMethod GET
- ReqURL /fr/stores/store/redirect/___store/en/___from_store/fr/uenc/aHR0cHM6Ly83eWFhay5jb20vZW4vY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZZWEl2YUc5MWMyVm9iMnhrTG1oMGJXd19jRDB6L3Byb2R1Y3QvNDEzLw,,/
- ReqProtocol HTTP/1.1
- ReqHeader Host: domain.com
- ReqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
- ReqHeader Accept-Encoding: gzip,deflate
- ReqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-For: 185.191.171.22
- ReqHeader X-Forwarded-Host: domain.com
- ReqHeader X-Forwarded-Server: domain.com
- ReqHeader Connection: Keep-Alive
- ReqUnset X-Forwarded-For: 185.191.171.22
- ReqHeader X-Forwarded-For: 185.191.171.22, 127.0.0.1
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /fr/stores/store/redirect/___store/en/___from_store/fr/uenc/aHR0cHM6Ly83eWFhay5jb20vZW4vY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZZWEl2YUc5MWMyVm9iMnhrTG1oMGJXd19jRDB6L3Byb2R1Y3QvNDEzLw,,/
- ReqUnset Accept-Encoding: gzip,deflate
- ReqHeader Accept-Encoding: gzip
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- VCL_call MISS
- VCL_return fetch
- Link bereq 32771 fetch
- Timestamp Fetch: 1664111601.616769 0.000220 0.000220
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Sun, 25 Sep 2022 13:13:21 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 32770
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.4)
- 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: 32770
- RespUnset Via: 1.1 varnish (Varnish/6.4)
- VCL_return deliver
- Timestamp Process: 1664111601.616782 0.000233 0.000013
- Filters
- RespHeader Content-Length: 282
- RespHeader Connection: keep-alive
- Timestamp Resp: 1664111601.616807 0.000258 0.000024
- ReqAcct 615 0 615 269 282 551
- End
** << BeReq >> 32771
-- Begin bereq 32770 fetch
-- VCL_use boot
-- Timestamp Start: 1664111601.616650 0.000000 0.000000
-- BereqMethod GET
-- BereqURL /fr/stores/store/redirect/___store/en/___from_store/fr/uenc/aHR0cHM6Ly83eWFhay5jb20vZW4vY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZZWEl2YUc5MWMyVm9iMnhrTG1oMGJXd19jRDB6L3Byb2R1Y3QvNDEzLw,,/
-- BereqProtocol HTTP/1.1
-- BereqHeader Host: domain.com
-- BereqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
-- BereqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
-- BereqHeader X-Forwarded-Proto: https
-- BereqHeader X-Forwarded-Host: domain.com
-- BereqHeader X-Forwarded-Server: domain.com
-- BereqHeader X-Forwarded-For: 185.191.171.22, 127.0.0.1
-- BereqHeader grace: none
-- BereqHeader Accept-Encoding: gzip
-- BereqHeader X-Varnish: 32771
-- VCL_call BACKEND_FETCH
-- VCL_return fetch
-- FetchError backend default: unhealthy
-- Timestamp Beresp: 1664111601.616665 0.000014 0.000014
-- Timestamp Error: 1664111601.616665 0.000015 0.000000
-- BerespProtocol HTTP/1.1
-- BerespStatus 503
-- BerespReason Backend fetch failed
-- BerespHeader Date: Sun, 25 Sep 2022 13:13:21 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
* << Request >> 8
- Begin req 7 rxreq
- Timestamp Start: 1664111607.366603 0.000000 0.000000
- Timestamp Req: 1664111607.366603 0.000000 0.000000
- VCL_use boot
- ReqStart 127.0.0.1 13422 a0
- ReqMethod GET
- ReqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WW5KaGJtUXZhRzU2TG1oMGJXdywvcHJvZHVjdC8xMTMwLw,,/
- ReqProtocol HTTP/1.1
- ReqHeader Host: domain.com
- ReqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
- ReqHeader Accept-Encoding: gzip,deflate
- ReqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Forwarded-For: 185.191.171.5
- ReqHeader X-Forwarded-Host: domain.com
- ReqHeader X-Forwarded-Server: domain.com
- ReqHeader Connection: Keep-Alive
- ReqUnset X-Forwarded-For: 185.191.171.5
- ReqHeader X-Forwarded-For: 185.191.171.5, 127.0.0.1
- VCL_call RECV
- ReqHeader grace: none
- ReqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WW5KaGJtUXZhRzU2TG1oMGJXdywvcHJvZHVjdC8xMTMwLw,,/
- ReqUnset Accept-Encoding: gzip,deflate
- ReqHeader Accept-Encoding: gzip
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- VCL_call MISS
- VCL_return fetch
- Link bereq 9 fetch
- Timestamp Fetch: 1664111607.366837 0.000233 0.000233
- RespProtocol HTTP/1.1
- RespStatus 503
- RespReason Backend fetch failed
- RespHeader Date: Sun, 25 Sep 2022 13:13:27 GMT
- RespHeader Server: Varnish
- RespHeader content-type: text/html; charset=utf-8
- RespHeader Retry-After: 5
- RespHeader X-Varnish: 8
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish (Varnish/6.4)
- 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: 8
- RespUnset Via: 1.1 varnish (Varnish/6.4)
- VCL_return deliver
- Timestamp Process: 1664111607.366855 0.000252 0.000018
- Filters
- RespHeader Content-Length: 278
- RespHeader Connection: keep-alive
- Timestamp Resp: 1664111607.366893 0.000289 0.000037
- ReqAcct 610 0 610 269 278 547
- End
** << BeReq >> 9
-- Begin bereq 8 fetch
-- VCL_use boot
-- Timestamp Start: 1664111607.366701 0.000000 0.000000
-- BereqMethod GET
-- BereqURL /en/stores/store/redirect/___store/fr/___from_store/en/uenc/aHR0cHM6Ly83eWFhay5jb20vYXIvY2hlY2tvdXQvY2FydC9hZGQvdWVuYy9hSFIwY0hNNkx5ODNlV0ZoYXk1amIyMHZaVzR2WW5KaGJtUXZhRzU2TG1oMGJXdywvcHJvZHVjdC8xMTMwLw,,/
-- BereqProtocol HTTP/1.1
-- BereqHeader Host: domain.com
-- BereqHeader Accept: text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml
-- BereqHeader User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
-- BereqHeader X-Forwarded-Proto: https
-- BereqHeader X-Forwarded-Host: domain.com
-- BereqHeader X-Forwarded-Server: domain.com
-- BereqHeader X-Forwarded-For: 185.191.171.5, 127.0.0.1
-- BereqHeader grace: none
-- BereqHeader Accept-Encoding: gzip
-- BereqHeader X-Varnish: 9
-- VCL_call BACKEND_FETCH
-- VCL_return fetch
-- FetchError backend default: unhealthy
-- Timestamp Beresp: 1664111607.366723 0.000021 0.000021
-- Timestamp Error: 1664111607.366724 0.000022 0.000001
-- BerespProtocol HTTP/1.1
-- BerespStatus 503
-- BerespReason Backend fetch failed
-- BerespHeader Date: Sun, 25 Sep 2022 13:13:27 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 278
-- BereqAcct 0 0 0 0 0 0
-- End
1 answers
solution1
0 2022-09-26 09:17:29
Backend unhealthy
I noticed the following log line in your log output:
-- FetchError backend default: unhealthy
This means that your backend is administratively set to an unhealthy state because too many health checks failed.
See https://www.varnish-software.com/developers/tutorials/troubleshooting-varnish/#backend-health-monitoring for a handy tutorial about backend health monitoring in Varnish
You could run sudo varnishlog -g raw -i Backend_health to validate this and see how many failures have taken place.
Backend health criteria
The criteria for the backend to be considered healthy in your configuration are the following:
- The backend should connect within 3.5 seconds (default value)
- The first byte should be received within 600 seconds after sending the backend request
- The response should have a
200status code - 5 (the threshold value) out of 10 (the window value) health checks should succeed
Debugging the health check probe
In your VCL code /health_check.php is the endpoint of the health check probe. Run the following command to debug what's going on when Varnish loads it every 5 seconds:
sudo varnishlog -g request -q "ReqUrl eq '/health_check.php'"
You can add the output of this command to your question and I'll help you debug.
However, if the returned status code for these health checks is 404 , it means you're using the wrong URL and you need to fix that first.
See https://www.varnish-software.com/developers/tutorials/configuring-varnish-magento/#fixing-the-backend-health-checks-for-magento-24 for a tutorial section about a common mistake in Magento when using
health_check.php.
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