From d85cec148907dd3a9d0e18eed4ad068e32fefe1d Mon Sep 17 00:00:00 2001
From: Luka Gulin <lgulin@phy.hr>
Date: Mon, 7 Jul 2025 10:48:41 +0200
Subject: [PATCH] add support for backup beacon nodes

---
 docker-compose.yml      |  1 +
 validator/entrypoint.sh | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/docker-compose.yml b/docker-compose.yml
index 5446196..4184e63 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -36,6 +36,7 @@ services:
       FEE_RECIPIENT_ADDRESS: ""
       ENABLE_DOPPELGANGER: "true"
       EXTRA_OPTS: ""
+      BACKUP_BEACON_NODES: ""
     volumes:
       - nimbus-validators-data:/home/user/nimbus-eth2/build/data
     restart: unless-stopped
diff --git a/validator/entrypoint.sh b/validator/entrypoint.sh
index ba380c3..6d87327 100644
--- a/validator/entrypoint.sh
+++ b/validator/entrypoint.sh
@@ -14,6 +14,14 @@ SIGNER_API_URL=$(get_signer_api_url "${NETWORK}" "${SUPPORTED_NETWORKS}")
 BEACON_API_URL=$(get_beacon_api_url "${NETWORK}" "${SUPPORTED_NETWORKS}" "${CLIENT}")
 MEVBOOST_FLAG=$(get_mevboost_flag "${NETWORK}" "${MEVBOOST_FLAG_KEY}" "${SKIP_MEVBOOST_URL}")
 
+
+BACKUP_BEACON_FLAGS=""
+if [ -n "${BACKUP_BEACON_NODES}" ]; then
+    for node in $(echo "${BACKUP_BEACON_NODES}" | tr ',' ' '); do
+        BACKUP_BEACON_FLAGS="${BACKUP_BEACON_FLAGS}--beacon-node=${node} "
+    done
+fi
+
 echo "[INFO - entrypoint] Running validator service"
 
 FLAGS="--log-level=$LOG_TYPE \
@@ -31,7 +39,9 @@ FLAGS="--log-level=$LOG_TYPE \
     --metrics-address=0.0.0.0 \
     --metrics-port=8008 \
     --graffiti=$VALID_GRAFFITI \
-    --beacon-node=$BEACON_API_URL $MEVBOOST_FLAG $EXTRA_OPTS"
+    --beacon-node=$BEACON_API_URL \
+    $BACKUP_BEACON_FLAGS \
+    $MEVBOOST_FLAG $EXTRA_OPTS"
 
 # shellcheck disable=SC2086
 exec ${NIMBUS_BIN} $FLAGS