diff --git a/README.md b/README.md
index 7639cfd64..c5df6ba89 100644
--- a/README.md
+++ b/README.md
@@ -341,6 +341,7 @@ steps:
       config:
         image: "denoland/deno:1.10.3"
         autoRemove: true
+        host: "host.docker.internal"
     command: run https://examples.deno.land/hello-world.ts
 ```
 
@@ -348,29 +349,8 @@ Example Log output:
 
 ![docker](./examples/images/docker.png)
 
-You can control the Docker container by passing more detailed options.
+To see more configurations, visit [this](https://github.com/yohamta/dagu/tree/main/examples#runing-docker-image) page.
 
-For example:
-```yaml
-steps:
-  - name: deno_hello_world
-    executor: 
-      type: docker
-      config:
-        image: "denoland/deno:1.10.3"
-        container:
-          volumes:
-            /app:/app:
-          env:
-            - FOO=BAR
-        host:
-          autoRemove: true
-    command: run https://examples.deno.land/hello-world.ts
-```
-
-See the Docker's API documentation for all available options.
-- For `container`, see [ContainerConfig](https://pkg.go.dev/github.com/docker/docker/api/types/container#Config).
-- For `host`, see [HostConfig](https://pkg.go.dev/github.com/docker/docker/api/types/container#HostConfig).
 
 ### HTTP Requests
 
@@ -814,7 +794,6 @@ dags: <the location of DAG configuration files>              # default: ${DAGU_H
 You can change the status of any task to a `failed` state. Then, when you retry the DAG, it will execute the failed one and any subsequent.
 
 ### How does it track running processes without DBMS?
-
 dagu uses Unix sockets to communicate with running processes.
 
 ## License
diff --git a/examples/README.md b/examples/README.md
index 65a0ceb90..98c57bb80 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -6,6 +6,8 @@
   - [Writing to a file](#writing-to-a-file)
   - [Passing output to the next step](#passing-output-to-the-next-step)
   - [Runing Docker image](#runing-docker-image)
+    - [Container configurations](#container-configurations)
+    - [How to run docker image inside a `dagu` container](#how-to-run-docker-image-inside-a-dagu-container)
   - [Runing command via SSH](#runing-command-via-ssh)
   - [Sending HTTP request](#sending-http-request)
   - [Sending Email Notification](#sending-email-notification)
@@ -103,6 +105,60 @@ steps:
     command: run https://examples.deno.land/hello-world.ts
 ```
 
+### Container configurations
+
+You can config the Docker container (e.g., `volumes`, `env`, etc) by passing more detailed options.
+
+For example:
+```yaml
+steps:
+  - name: deno_hello_world
+    executor: 
+      type: docker
+      config:
+        image: "denoland/deno:1.10.3"
+        container:
+          volumes:
+            /app:/app:
+          env:
+            - FOO=BAR
+        host:
+          autoRemove: true
+    command: run https://examples.deno.land/hello-world.ts
+```
+
+See the Docker's API documentation for all available options.
+
+- For `container`, see [ContainerConfig](https://pkg.go.dev/github.com/docker/docker/api/types/container#Config).
+- For `host`, see [HostConfig](https://pkg.go.dev/github.com/docker/docker/api/types/container#HostConfig).
+
+### How to run docker image inside a `dagu` container
+
+If you are running `dagu` using a container, you need the below setup.
+
+1. Run a `socat` conainer:
+
+```sh
+docker run -v /var/run/docker.sock:/var/run/docker.sock -p 2376:2375 bobrik/socat TCP4-LISTEN:2375,fork,reuseaddr UNIX-CONNECT:/var/run/docker.sock
+```
+
+2. Then you can set the `DOCKER_HOST` environment as follows:
+
+```yaml
+env:
+  - DOCKER_HOST : "tcp://host.docker.internal:2376"
+steps:
+  - name: deno_hello_world
+    executor: 
+      type: docker
+      config:
+        image: "denoland/deno:1.10.3"
+        autoRemove: true
+    command: run https://examples.deno.land/hello-world.ts
+```
+
+For more details, see [this page](https://forums.docker.com/t/remote-api-with-docker-for-mac-beta/15639/2).
+
 ## Runing command via SSH
 
 ```yaml
diff --git a/examples/exec_docker_image.yaml b/examples/exec_docker_image.yaml
index ee4919072..1313cdc84 100644
--- a/examples/exec_docker_image.yaml
+++ b/examples/exec_docker_image.yaml
@@ -1,3 +1,5 @@
+env:
+  - DOCKER_HOST : "tcp://host.docker.internal:2376"
 steps:
   - name: deno_hello_world
     executor: