Add option to disable IPV6 for resolving

Dockerfile

@@ -116,6 +116,7 @@ ENV PROXY_SEND_TIMEOUT="60s"
 ENV PROXY_CONNECT_READ_TIMEOUT="60s"
 ENV PROXY_CONNECT_CONNECT_TIMEOUT="60s"
 ENV PROXY_CONNECT_SEND_TIMEOUT="60s"
+ENV DISABLE_IPV6="false"
 
 # Did you want a shell? Sorry, the entrypoint never returns, because it runs nginx itself. Use 'docker exec' if you need to mess around internally.
 ENTRYPOINT ["/entrypoint.sh"]

MyNotes.md

@@ -0,0 +1,14 @@
+## Build
+
+```sh
+buildah bud --layers -f Dockerfile \
+	--tag=rpjosh.de/docker-registry-proxy:0.0.0-dev
+```
+
+## Publish
+
+```
+podman login git.rpjosh.de
+podman tag rpjosh.de/docker-registry-proxy:0.0.0-dev git.rpjosh.de/rpjosh/docker-registry-proxy:0.7.0
+podman push git.rpjosh.de/rpjosh/docker-registry-proxy:0.7.0
+```

README.md

@@ -102,6 +102,7 @@ ENV PROXY_REQUEST_BUFFERING="true"
   - PROXY_CONNECT_READ_TIMEOUT : see [proxy_connect_read_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_read_timeout)
   - PROXY_CONNECT_CONNECT_TIMEOUT : see [proxy_connect_connect_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_connect_timeout)
   - PROXY_CONNECT_SEND_TIMEOUT : see [proxy_connect_send_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_send_timeout))
+  - DISABLE_IPV6: If set to `true`, prevents nginx from getting IPv6 addresses from the resolver without needing a [custom resolver config](#custom_nginx_resolvers_configuration)
 
 
 ### Simple (no auth, all cache)

entrypoint.sh

@@ -25,7 +25,11 @@ echo "DEBUG, determined RESOLVERS from /etc/resolv.conf: '$RESOLVERS'"
 conf=""
 for ONE_RESOLVER in ${RESOLVERS}; do
 	echo "Possible resolver: $ONE_RESOLVER"
-	conf="resolver $ONE_RESOLVER; "
+    if [[ "a${DISABLE_IPV6}" == "atrue" ]]; then
+	    conf="resolver $ONE_RESOLVER ipv6=off; "
+    else
+        conf="resolver $ONE_RESOLVER; "
+    fi
 done
 
 echo "Final chosen resolver: $conf"