fix: replace $upstream variable with BACKEND env var
#331
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`proxy_pass` will use the resolver whenever the argument contains variables. This isn't usually an issue but it can be if hosts are declared via `/etc/hosts`, e.g. when useing `extra_hosts` from docker compose. Then, `/etc/hosts` would not be considered. Use the `BACKEND` variable directly to avoid use of the resolver. Fixes coreruleset#330
fzipi
approved these changes
Feb 6, 2025
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Thanks so much! Just to elaborate (because it took me a real long time on Google to figure this out), if proxy_pass sees a variable as its parameter, it will no longer consider /etc/hosts when resolving a host, and only refer the DNS resolver it's been configured to resolve hosts. If proxy_pass sees a literal as its parameter, it will consider /etc/hosts first before referring to the DNS resolver. This is important if you depend on extra_hosts for your container to function correctly. |
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proxy_passwill use the resolver whenever the argument contains variables. This isn't usually an issue but it can be if hosts are declared via/etc/hosts, e.g. when useingextra_hostsfrom docker compose. Then,/etc/hostswould not be considered.Use the
BACKENDvariable directly to avoid use of the resolver.Fixes #330