allow prioritizing ipv4

GEANT · Sep 5, 2024 · f552f3f · f552f3f
1 parent 1ff6f24
commit f552f3f
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diff --git a/README.md b/README.md
@@ -142,6 +142,7 @@ From a networking perspective:
 | `ENABLE_OPENDKIM`    | Optional. Set to "true" to enable OpenDKIM. If OpenDKIM is enabled, the "OpenDKIM Configuration" variables below will need to be set. Default is "false". |
 | `ENABLE_POSTGREY`    | Optional. Set to "true" to enable [postgrey](https://postgrey.schweikert.ch). Default is "false". |
 | `ENABLE_SPF`         | Optional. Set to "true" to enable [policyd-spf](https://launchpad.net/postfix-policyd-spf-perl/). Default is "false". |
+| `PREFER_IPV4`        | Optional. Prioritize IPv4. Set to "true" to enable [gai.conf](https://man7.org/linux/man-pages/man5/gai.conf.5.html). Default is false. |
 | `POSTMASTER_EMAIL`   | Required. Set to the email of your domain's postmaster. Example: `[email protected]`. |
 | `TZ`                 | Recommended. Set the timezone for the container. Default is `UTC`. |
 

diff --git a/rootfs/etc/cont-init.d/99-other.sh b/rootfs/etc/cont-init.d/99-other.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/with-contenv bash
+# shellcheck shell=bash
+
+# Add precedence to IPv4
+if [ -z "${PREFER_IPV4}" ]; then
+  echo 'precedence ::ffff:0:0/96 100' >>/etc/gai.conf
+fi