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Shrink dynamic port range #2856

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merged 2 commits into from Jul 19, 2017
Merged

Shrink dynamic port range #2856

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8a2c655
Shrink dynamic port range
dadgar Jul 18, 2017
24236e6
docs
dadgar Jul 18, 2017
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2 changes: 1 addition & 1 deletion nomad/structs/network.go
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Expand Up @@ -12,7 +12,7 @@ const (
MinDynamicPort = 20000

// MaxDynamicPort is the largest dynamic port generated
MaxDynamicPort = 60000
MaxDynamicPort = 32000

// maxRandPortAttempts is the maximum number of attempt
// to assign a random port
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14 changes: 14 additions & 0 deletions website/source/guides/cluster/requirements.html.md
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Expand Up @@ -72,3 +72,17 @@ port.

* Serf WAN (Default 4648). This is used by servers to gossip over the WAN to
other servers. TCP and UDP.

When tasks ask for dynamic ports, they are allocated out of the port range
between 20,000 and 32,000. This is well under the ephemeral port range suggested
by the [IANA](https://en.wikipedia.org/wiki/Ephemeral_port). If your operating
system's default ephemeral port range overlaps with Nomad's dynamic port range,
you should tune the OS to avoid this overlap.

On Linux this can be checked and set as follows:

```
$ cat /proc/sys/net/ipv4/ip_local_port_range
32768 60999
$ echo "49152 65535" > /proc/sys/net/ipv4/ip_local_port_range
```