diff --git a/README.md b/README.md
index 046c835..115b578 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,21 @@ Alternatively, you can add `tinycloud=cloud=<cloud>` (preferred) or `ds=<cloud>`
 `/sys/class/dmi/id/product_serial` (QEMU hack) is another way to explicitly
 choose a cloud provider.
 
+### Custom Metadata Service Endpoint
+
+For custom or non-standard metadata services, you can
+override the default IMDS endpoint by setting `IMDS_ENDPOINT` in
+`/etc/tiny-cloud.conf`:
+
+```sh
+# For Tinkerbell or other custom metadata services
+IMDS_ENDPOINT=192.0.2.1:50061
+```
+
+The default endpoint is `169.254.169.254` for most cloud providers. This
+setting allows you to specify a custom IP address and optional port for the
+metadata service.
+
 ## Operation
 
 The first time an instance boots -- either freshly instantiated from an image,
diff --git a/bin/imds b/bin/imds
index 6ccce6b..575ac53 100755
--- a/bin/imds
+++ b/bin/imds
@@ -52,7 +52,8 @@ unset -f \
 ### default variables/functions
 
 # Common to many clouds
-IMDS_ENDPOINT="169.254.169.254"
+# Can be overridden in /etc/tiny-cloud.conf
+: "${IMDS_ENDPOINT:=169.254.169.254}"
 
 # Common to AWS and NoCloud(ish)
 IMDS_HOSTNAME="meta-data/hostname"
diff --git a/docs/tiny-cloud.conf.5.scd b/docs/tiny-cloud.conf.5.scd
index e6d0bbc..0bc6e3e 100644
--- a/docs/tiny-cloud.conf.5.scd
+++ b/docs/tiny-cloud.conf.5.scd
@@ -33,6 +33,10 @@ Blank lines and shell comments are ignored.
 	Default user account for instance SSH keys and default-user setup. The default
 	is *alpine*.
 
+*IMDS_ENDPOINT*=<ip_address>
+	Provider endpoint IP address to use. Defaults to 169.254.169.254 for many
+	providers.
+
 *IMDS_TOKEN_TTL*=<seconds>
 	Metadata token lifetime in seconds for AWS metadata access. This is only used
 	by the AWS provider. The default is *5*.
diff --git a/lib/tiny-cloud/tiny-cloud.conf b/lib/tiny-cloud/tiny-cloud.conf
index 599c6d5..7100c49 100644
--- a/lib/tiny-cloud/tiny-cloud.conf
+++ b/lib/tiny-cloud/tiny-cloud.conf
@@ -8,6 +8,11 @@
 # User account where instance SSH keys are installed
 #CLOUD_USER=alpine
 
+# IMDS endpoint override (IP:PORT or IP)
+# Defaults to 169.254.169.254 for most clouds
+# Useful for custom metadata services
+#IMDS_ENDPOINT=169.254.169.254
+
 # IMDS token validity, in seconds (AWS only)
 #IMDS_TOKEN_TTL=5