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Merge pull request #26168 from sfsmithcha/fix_swarm_tutorial_note 

Merge pull request #26114 from londoncalling/fix-linespacing-swarmtut
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@ -27,7 +27,7 @@ This tutorial uses Docker Engine CLI commands entered on the command line of a
terminal window. You should be able to install Docker on networked machines and
be comfortable running commands in the shell of your choice.
If you’re brand new to Docker, see [About Docker Engine](../../index.md).
If you are brand new to Docker, see [About Docker Engine](../../index.md).
## Set up
@ -48,15 +48,16 @@ provider. This tutorial uses the following machine names:
* worker1
* worker2
### Docker Engine 1.12 or later
>**Note:** You can follow many of the tutorial steps to test single-node swarm
as well, in which case you need only one host. Multi-node commands will not
work, but you can initialize a swarm, create services, and scale them.
To use swarm mode, you must [install Docker Engine](../../installation/index.md)
on each one of the host machines. Alternatively, install the latest Docker for
Mac or Docker for Windows.
### Docker Engine 1.12 or newer
>**Note**: Docker for Mac and Docker for Windows let you use single-node
features of swarm mode, like creating a swarm and creating a service. Multi-node
features like joining additional nodes and scaling a service are not available.
This tutorial requires Docker Engine 1.12 or newer on each of the host machines.
Install Docker Engine and verify that the Docker Engine daemon is running on
each of the machines. You can get the latest version of Docker Engine as
follows:
* [install Docker Engine on Linux machines](#install-docker-engine-on-linux-machines)
@ -96,23 +97,30 @@ Docker for Mac or Docker for Windows running.
### The IP address of the manager machine
The IP address must be assigned to an a network interface available to the host
operating system. All nodes in the swarm must be able to access the manager at the IP address.
The IP address must be assigned to a network interface available to the host
operating system. All nodes in the swarm must be able to access the manager at
the IP address.
Because other nodes contact the manager node on its IP address, you should use a
fixed IP address.
>**Tip**: You can run `ifconfig` on Linux or Mac OS X to see a list of the
You can run `ifconfig` on Linux or Mac OS X to see a list of the
available network interfaces.
If you are using Docker Machine, you can get the manager IP with either
`docker-machine ls` or `docker-machine ip <MACHINE-NAME>` &#8212; for example,
`docker-machine ip manager1`.
The tutorial uses `manager1` : `192.168.99.100`.
### Open ports between the hosts
The following ports must be available. On some systems, these ports are open by default.
* **TCP port 2377** for cluster management communications
* **TCP** and **UDP port 7946** for communication among nodes
* **TCP** and **UDP port 4789** for overlay network traffic
## What's next?
After you have set up your environment, you're ready to [create a swarm](create-swarm.md).
After you have set up your environment, you are ready to [create a swarm](create-swarm.md).