Assigning a unique random IP Address to each host

[pho...@startledphoenix.com]

To make OpenVPN tunnels between hosts a bit easier, I was wondering if there was a way to assign unique IP Addresses as grains for each minion.

For example:

minion1:

    localip:

        192.168.300.101

minion2:

    localip:

        192.168.300.103

minion3

    localip:

        192.168.300.110

They don't need to be contiguous, just as long as they are unique and within the range of a subnet (/24). I don't think there will ever be any way that I will manage to get to 100+ hosts, so a method to allocate from 192.168.300.100-192.168.300.200 would be fine by me.

[Mohamed Lrhazi]

You don't care that it's contiguous, you probably also don't care that it is random. you only care that it is unique. You would need to remember what IPs you had assigned so far, so you can pick the next unique one...

I suppose you could do this in a Jina template... load current assigned IPs csv file, into a "by minion_id dictionary"... and add new entry for new minions?

[StartledPhoenix]

Is there any documentation on how to import a CSV into salt, or will I have to do this through python?

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[Florian Ermisch]

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Just use YAML/JSON/jinja to create a dictionary, don't bother with importing CSV for 2 values per minion. If you don't care about other minions seeing the assignment you can just list them in a key like [VPN:ips]:

vpn:
ips:
minion1: 192.0.2.101
minion2: 192.0.2.103
minion3: 192.0.2.110

Or use the pillar for the hostsfile-formula for hostnames like "minion1.vpn" and choose minion_id + ".vpn" for the IP in the openvpn-config.

For setting and especially retrieving a value on other minions you should take a look at the salt-mine.

And /please/, if you want an IPv4 address for documentation/examples use TEST-NET aka 192.0.2.0/24 [0] (or TEST-NET-2, TEST-NET-3) instead of something syntactically invalid…

Regards, Florian

[0] http://en.m.wikipedia.org/wiki/Reserved_IP_addresses

>>> 192.[0.2].101
>>> minion2:
>>> localip:
>>> 192.[0.2].103
>>> minion3
>>> localip:
>>> 192.[0.2].110

>>>
>>> They don't need to be contiguous, just as long as they are unique
>and
>>> within the range of a subnet (/24). I don't think there will ever be
>any
>>> way that I will manage to get to 100+ hosts, so a method to allocate
>from

>>> 192.[0.2].100-192.[0.2].200 would be fine by me.
>>>
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