diff --git a/.gitignore b/.gitignore
index 8d6d2d3fdf13a7dfd9fa39b11634b22a344bc85b..56e941580e35c07ec864d187a4291e473f541966 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ packages/
 **/dependency-reduced-pom.xml
 /skywalking-agent/
 /dist/
+/docker/snapshot/*.gz
diff --git a/docker/Makefile b/docker/Makefile
index 85ca996e3cfa994afa05abe28cd886ccd00cb99d..30f159ce03c4ff69ea02574037359c34e26ad179 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -1,3 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 snapshot:
 	cd snapshot; \
diff --git a/docker/snapshot/Dockerfile b/docker/snapshot/Dockerfile
index 47d661b4214b9cde01b66c0738da7fe04749f1f7..59cbe6d736cf7b2de46accab93c5573b30a5ea69 100644
--- a/docker/snapshot/Dockerfile
+++ b/docker/snapshot/Dockerfile
@@ -1,3 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 FROM openjdk:8-jre-alpine
 
 ENV DIST_NAME=apache-skywalking-apm-incubating \
diff --git a/docker/snapshot/docker-entrypoint.sh b/docker/snapshot/docker-entrypoint.sh
index 4f8225736d84470cb127a31908a5b993911e500c..451e9a8b7d24c63b60a26fc4a4b2e07a456d9efe 100755
--- a/docker/snapshot/docker-entrypoint.sh
+++ b/docker/snapshot/docker-entrypoint.sh
@@ -1,3 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 #!/bin/bash
 
 set -e
diff --git a/docker/stack.yml b/docker/stack.yml
index 0c0b9eac1f8f207ade8fff6d8b808cdada9f513d..63c25f7c341142228864746d095bdd5377a5ea4e 100644
--- a/docker/stack.yml
+++ b/docker/stack.yml
@@ -1,3 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 version: '3.3'
 services:
   elasticsearch: