My attempt to obfuscate the hosts failed :) Sorry for that. In short: the configured backend is atomgraph.dydra.com but BereqHeader Host is atomgraph.dydra.varnish. Why?
On Wed, Mar 18, 2020 at 11:36 AM Martynas Jusevičius <[email protected]> wrote: > > Hi, > > I'm using varnish-5.2.1 revision 67e562482 as a Docker image and > trying to restore the setup that was working some time ago. > > However I'm getting 503 Backend fetch failed. > > The VCL file clearly specifies the backend: > > backend default { > .host = "atomgraph.some_host.com"; > .port = "80"; > .first_byte_timeout = 60s; > } > > Varnish itself runs on atomgraph.some_host.varnish, as specified in > docker-compose.yml. > > When I login into the container, I see the client request: > > - ReqMethod GET > - ReqURL /smth/smth/... > - ReqProtocol HTTP/1.1 > - ReqHeader Accept: > application/rdf+xml,text/rdf+n3,application/n-triples,text/csv,application/rdf+xml,application/rdf+thrift,text/turtle,application/rdf+json > - ReqHeader Cache-Control: no-cache > - ReqHeader Authorization: Basic > bGlua2VkZGF0YWh1YjpqYThhc3BhdHV0YWtFdGhV > - ReqHeader Host: atomgraph.dydra.varnish > - ReqHeader Connection: Keep-Alive > - ReqHeader User-Agent: Apache-HttpClient/4.1.1 (java 1.5) > - ReqHeader X-Forwarded-For: 172.30.0.3 > > However when I look at the backend request: > > - BereqMethod GET > - BereqURL /smth/smth/... > - BereqProtocol HTTP/1.1 > - BereqHeader Accept: > application/rdf+xml,text/rdf+n3,application/n-triples,text/csv,application/rdf+xml,application/rdf+thrift,text/turtle,application/rdf+json > - BereqHeader Authorization: Basic > bGlua2VkZGF0YWh1YjpqYThhc3BhdHV0YWtFdGhV > - BereqHeader Host: atomgraph.dydra.varnish > - BereqHeader User-Agent: Apache-HttpClient/4.1.1 (java 1.5) > - BereqHeader X-Forwarded-For: 172.30.0.3 > - BereqHeader X-Varnish: 32783 > > it looks like it is calling itself (i.e. the local fake .varnish > backend host instead of the real .com one), judging from the > BereqHeader Host. > > If that is the case, then no wonder that the backend request fails: > > - BerespProtocol HTTP/1.1 > - BerespStatus 503 > - BerespReason Service Unavailable > - BerespReason Backend fetch failed > > How can this be? > > Martynas _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
