Add option to use Docker container to run Asynqmon

README.md

@@ -22,8 +22,8 @@ installed in order to build the frontend assets.
 
 Download the source code and then run:
 
-```sh
-$ make build
+```bash
+make build
 ```
 
 The `asynqmon` binary should be created in the current directory.
@@ -35,20 +35,58 @@ By default, it connects to redis server running on port 6379 locally, and the se
 
 To use the defaults, simply run and open http://localhost:8080.
 
-```sh
-$ asynqmon
+```bash
+./asynqmon
 ```
 
 Pass flags to specify port, redis server address, etc.
 
-```sh
-$ asynqmon --port=3000 --redis_addr=localhost:6380
+
+```bash
+./asynqmon --port=3000 --redis_addr=localhost:6380
 ```
 
 To see all available flags, run
 
-```sh
-$ asynqmon --help
+```bash
+./asynqmon --help
+```
+
+## Running from Docker
+
+To run Asynqmon in Docker container, you only need to install [Docker](https://www.docker.com/get-started) to your system. No need to install [Node.js](https://nodejs.org/) and [Yarn](https://yarnpkg.com/), they will be installed automatically in container.
+
+After that, just run this command:
+
+```bash
+make docker
+```
+
+Next, go to [localhost:8080](http://localhost:8080) and see Asynqmon dashboard:
+
+![Screenshot](https://user-images.githubusercontent.com/11155743/113557216-57af2b80-9606-11eb-8ab6-df023b14e5c1.png)
+
+### Change a default Asynqmon settings
+
+By default, Asynqmon runs on `http://localhost:8080` and waiting to connect to the Redis server on port `6379`. You can easily change this settings by running Docker container with custom options, like this:
+
+```bash
+docker run --rm \
+    --name asynqmon \
+    -p 3000:3000 \
+    asynqmon --port=3000 --redis_addr=localhost:6380
+```
+
+### Works with a Redis server from Docker
+
+If you run Redis server from Docker container too (i.e. is **not** locally installed to your machine), you need to set [Docker network](https://docs.docker.com/network/) to make them work together. For example, if Redis container have a name like `dev-redis`, and our Docker network called `dev-network`, you should run Asynqmon container by this command:
+
+```bash
+docker run --rm \
+    --name asynqmon \
+    --network dev-network \
+    -p 8080:8080 \
+    asynqmon --redis_addr=dev-redis:6379
 ```
 
 ## License