diff --git a/scripts/install_redis.sh b/scripts/install_redis.sh
index ba8103c..a8784ea 100644
--- a/scripts/install_redis.sh
+++ b/scripts/install_redis.sh
@@ -131,8 +131,14 @@ step_install() {
         lock_retries=$((lock_retries - 1))
     done
 
-    if ! dnf install -y redis 2>&1; then
-        error_exit "dnf install redis failed. Check: (1) internet connectivity, (2) dnf repo config, (3) run: dnf install -y redis"
+    # Free memory: clean dnf cache and drop OS caches before install
+    dnf clean all >/dev/null 2>&1 || true
+    sync; echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+
+    if ! dnf install -y --setopt=install_weak_deps=False --setopt=keepcache=False redis 2>&1; then
+        local mem_avail
+        mem_avail=$(awk '/MemAvailable/{print int($2/1024)"MB"}' /proc/meminfo 2>/dev/null || echo "unknown")
+        error_exit "dnf install redis failed (available RAM: $mem_avail). If OOM, scale up the node first. Then run: dnf install -y redis"
     fi
 
     # Verify binary appeared post-install