diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 000000000..f32a0ec6a
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,3 @@
+node.out
+node
+node.out-*.tar.gz
diff --git a/docker/Dockerfile.android b/docker/Dockerfile.android
index e715c8fd2..2f5e03523 100644
--- a/docker/Dockerfile.android
+++ b/docker/Dockerfile.android
@@ -14,17 +14,20 @@ ENV CXXFLAGS -fPIC
 
 RUN echo "[0/3] installing packages..." && \
 	apt-get -qq update && \
-
-	DEBIAN_FRONTEND=noninteractive apt-get -qq install -y \
+	DEBIAN_FRONTEND=noninteractive apt-get -qq install --no-install-recommends -y \
 	git \
+  ca-certificates \
 	unzip \
 	gcc gcc-multilib \
 	g++ g++-multilib \
 	curl \
-	file
+	file && \
+  apt-get clean && rm -r /var/lib/apt/lists/*
+
 
 RUN echo "[1/2] cloning dependencies..." && \
-	git clone https://github.com/sjitech/android-gcc-toolchain 
+	git clone --depth=1 --branch=master https://github.com/sjitech/android-gcc-toolchain && \
+  rm -rf android-gcc-toolchain/.git
 
 RUN echo "[2/2] setting up..." && \
  	curl -fSOL https://dl.google.com/android/repository/$NDK_NAME.zip && \
diff --git a/docker/Dockerfile.linux b/docker/Dockerfile.linux
index 5e09a1d9c..d15d46715 100644
--- a/docker/Dockerfile.linux
+++ b/docker/Dockerfile.linux
@@ -7,16 +7,17 @@ ENV _JAVA_OPTIONS -Xms1024m -Xmx1024m -XX:MaxPermSize=512m
 
 RUN echo "[0/3] installing packages..." && \
 	apt-get -qq update && \
-	DEBIAN_FRONTEND=noninteractive apt-get -qq install -y \
-        openjdk-7-jdk \
+	DEBIAN_FRONTEND=noninteractive apt-get -qq install --no-install-recommends -y \
+  openjdk-7-jdk \
 	git \
 	unzip \
 	gcc gcc-multilib \
 	g++ g++-multilib \
 	curl \
 	file \
-        execstack \
-        maven
+  execstack \
+  maven && \
+  apt-get clean && rm -r /var/lib/apt/lists/*
 
 CMD cd jni && \
   echo "building...." && \
@@ -44,4 +45,3 @@ CMD cd jni && \
     strip --strip-unneeded -R .note -R .comment libj2v8_linux_x86_64.so && \
     cd .. && \
     mvn clean verify -e
-