diff --git a/Dockerfile b/Dockerfile
index eafe28d..e6bf8c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ ARG BASE_IMAGE="nginx:alpine"
 FROM ${BASE_IMAGE}
 
 # Install ping and ip
-RUN apk add --no-cache iproute2 iputils nginx-mod-http-lua
+RUN apk add --no-cache iproute2 iputils nginx-mod-http-lua bash
 
 # Default nginx proxy envs
 ENV NGINX_PROXY_SOURCE_PORT=${NGINX_PROXY_SOURCE_PORT:-"Please configure NGINX_PROXY_SOURCE_PORT env!"}