How to randomize the order of server names

[MK]

Does anyone have experiences randomizing the order of redundant server names  in the client configuration and won't change the order during next puppet agent runs?

For example, I have a bunch of ldap slave servers put in an array:

$_ldap_servers = ['ldap1' , 'ldap2', 'ldap3']

I want to randomize the order in the client config (ex, nslcd.conf or sssd.conf ) so they don't always hit the same ldap server.

ex:

ldap_search_base = dc=example, dc=com

ldap_uri = ldaps://ldap2 ldaps://ldap0 ldaps://ldap3

What I did so far is that in the ERB template, I put the following code:

````

ldap_uri = <%

       server_list = @_ldap_servers.shuffle

       server_list.size.times do

       server = server_list[rand(server_list.size)] -%>ldaps://<%= server -%>/ <%

         server_list.delete(server)

       end %>

```

It was working well with Rack based puppetmaster 3.x, but after upgrading to puppetserver 2.7.x, it changes the order every time when agent runs.

Does anyone have any suggestions?

Thanks so much!

MK

[Rob Nelson]

You could try fqdn_rand(). Fqdn_rand will generate a random number, but the same random number for a given fqdn, so you would get the same value every time rather than it changing. https://docs.puppet.com/puppet/latest/function.html#fqdnrand

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[Martijn]

I think that's perfect for the OP's use case. And if you need multiple random numbers there's a useful second parameter to fqdn_rand(), the "seed", which can be any string or integer and allows you to get multiple different random numbers on the same host.

So, you could use the server_list.size as the seed to get a different but number after you pop off an item from your server_list array.

--

Martijn

Op zondag 23 juli 2017 16:51:17 UTC+2 schreef Rob Nelson:

[Rob Nelson]

I did just notice this line, which should remove the .shuffle so it's consistent on every run:

       server_list = @_ldap_servers.shuffle

Rob Nelson
rnel...@gmail.com

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[Ramin K]

Forgot to reply on list, but we solved it with fqdn_rotate() doing most
of the work.

$_ldap_servers = ['ldap1','ldap2','ldap3']

$ldap_uri =
join(suffix(prefix(fqdn_rotate(sort($_ldap_servers))),'ldaps://'),'/'),' ')

Ramin

On 7/24/2017 7:24 AM, Rob Nelson wrote:
> I did just notice this line, which should remove the .shuffle so it's
> consistent on every run:
>
> server_list = @_ldap_servers.shuffle
>
>
>
> Rob Nelson

> rnel...@gmail.com <mailto:rnel...@gmail.com>

> <https://groups.google.com/d/msgid/puppet-users/cfe4921b-d777-4b9e-8b6a-473f7c1904a5%40googlegroups.com?utm_medium=email&utm_source=footer>.

> For more options, visit https://groups.google.com/d/optout

> <https://groups.google.com/d/optout>.

>
> --
> Rob Nelson
>
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