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Update deployment_swarm.md

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# Deployment guide for Docker Swarm
> Note: The best place to start is the README file in the faas or faas-netes repo.
### A foreword on security
These instructions are for a development environment. If you plan to expose OpenFaaS on the public Internet you need to enable basic authentication with a proxy such as Kong or Traefik at a minimum. TLS is also highly recomended and freely available with LetsEncrypt.org. [Kong guide](https://github.com/openfaas/faas/blob/master/guide/kong_integration.md) [Traefik guide](https://github.com/openfaas/faas/blob/master/guide/traefik_integration.md).
## Initialize Swarm Mode
You can create a single-host Docker Swarm on your laptop with a single command. You don't need any additional software to Docker 17.06 or greater. You can also run these commands on a Linux VM or cloud host.
This is how you initialize your master node:
```
# docker swarm init
```
If you have more than one IP address you may need to pass a string like `--advertise-addr eth0` to this command.
Take a note of the join token
* Join any workers you need
Log into your worker node and type in the output from `docker swarm init` on the master. If you've lost this info then type in `docker swarm join-token worker` and then enter that on the worker.
It's also important to pass the `--advertise-addr` string to any hosts which have a public IP address.
> Note: check whether you need to enable firewall rules for the [Docker Swarm ports listed here](https://docs.docker.com/engine/swarm/swarm-tutorial/).
## Deploy the stack
Clone OpenFaaS and then checkout the latest stable release:
```
$ git clone https://github.com/openfaas/faas && \
cd faas && \
git checkout 0.7.1 && \
./deploy_stack.sh
```
`./deploy_stack.sh` can be run at any time and includes a set of sample functions. You can read more about these in the [TestDrive document](https://github.com/openfaas/faas/blob/master/TestDrive.md)
## Test out the UI
Within a few seconds (or minutes if on a poor WiFi connection) the API gateway and sample functions will be pulled into your local Docker library and you will be able to access the UI at:
http://localhost:8080
If you're running on Linux you may find that `localhost` times out. In this case force an IPv4 address such as http://127.0.0.1:8080.
## Learn the CLI
You can now grab a coffee and start learning how to create your first function with the CLI:
[Morning coffee with the OpenFaaS CLI](https://blog.alexellis.io/quickstart-openfaas-cli/)
## Troubleshooting
If you are running into any issues please check out the troubleshooting guide and search the documentation / past issues before raising na issue.
* [Troubleshooting guide](https://github.com/openfaas/faas/blob/master/guide/troubleshooting.md)
This page has moved to the official documentation site:
https://docs.openfaas.com/deployment/docker-swarm/
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