Daemon configuration file - default-address-pools example fix

[kbendl]

File: engine/reference/commandline/dockerd.md

Please change the example configuration section for default-address-pools to use valid CIDR addresses:
Is:

"default-address-pools": [
  {
    "base": "172.80.0.0/16",
    "size": 24
  },
  {
   "base": "172.90.0.0/16",
    "size": 24
  }
],

Should use valid 172.16.0.0/12 CIDR address, so as not to collide with valid routing.

An example with valid CIDRs:

"default-address-pools": [
  {
    "base": "172.30.0.0/16",
    "size": 24
  },
  {
   "base": "172.31.0.0/16",
    "size": 24
  }
],

Thanks!

refs:

• https://tools.ietf.org/html/rfc1918

[pepawel]

I've created pull request for this issue:
docker/cli#3295

[docker-robott]

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