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managing /etc/hosts with Puppet and deleting duplicates

asked 2017-01-21 15:29:47 -0600

bess gravatar image


Im working a solution to dynamically manage /ect/hosts for my environment if a node has a certain tag.

For example,

if $facts['env'] =! undef {
  @@host { $facts['fqdn']:
     ip            => $facts['ipaddress'],
    host_aliases  => $facts['hostname'],
    tag           => [$env],
  ## get all stored hosts entries for $env from PuppetDB
  ## and ensure they exist in the hosts file.
  Host <<| tag == $env |>>


My question is, if say the IP or fqdn changes, will a new entry be appended to the hosts file persist?

If so, this dynamic solution will not work and ill have to keep using templates

I could write a function that parses /etc/hosts for these conditions and removes entries but the hosts resource should do that already.


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Why don't you just try it out?

Kai Burghardt gravatar imageKai Burghardt ( 2017-01-21 19:47:28 -0600 )edit

+1 try it out. I think there is also a 'purge' option that you can use to make sure it removes any host entries not managed by puppet. I believe your expected behavior is how it performs.

DarylW gravatar imageDarylW ( 2017-01-23 07:47:46 -0600 )edit

The purge option is a nogo since I need the ability to add manual entries and not have puppet clobber them. I'm probably going to settle on template but I liked the exported option :)

bess gravatar imagebess ( 2017-01-23 10:01:13 -0600 )edit

I don't understand "I need the ability to add entries not managed by puppet" but you say you are going with a template. Isn't that template still managed by puppet? You can add a lookup in hiera with a hash representing the entries you need added, and use create_resources to instantiate them

DarylW gravatar imageDarylW ( 2017-02-06 08:09:00 -0600 )edit

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answered 2017-02-03 04:55:19 -0600

Josh gravatar image

The fqdn is the namevar, so if the ip address changes then the entry will get updated, e.g.

Notice: /Stage[main]/Main/Host[foo]/ip: ip changed '' to ''

If the fqdn changes, then that's a new resource so you could end up with multiple entries with the same IP address but different hostnames

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Asked: 2017-01-21 15:29:47 -0600

Seen: 437 times

Last updated: Feb 03 '17