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Add info about network size limits for swarm mode #5208

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Merged
mdlinville merged 1 commit into from
Nov 2, 2017
Merged

Add info about network size limits for swarm mode #5208

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11 changes: 11 additions & 0 deletions engine/swarm/networking.md
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Expand Up @@ -192,6 +192,17 @@ $ docker network create \
my-network
```

##### Overlay network size limitations

You should create overlay networks with `/24` blocks (the default), which limits
you to 256 IP addresses, when you create networks using the default VIP-based
endpoint-mode. This recommendation addresses
[limitations with swarm mode](https://github.com/moby/moby/issues/30820). If you
need more than 256 IP addresses, do not increase the IP block size. You can either
use `dnsrr` endpoint mode with an external load balancer, or use multiple smaller
overlay networks. See [Configure service discovery](#configure-service-discovery)
for more information about different endpoint modes.

#### Configure encryption of application data

Management and control plane data related to a swarm is always encrypted.
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