[Puppet Users] Re: Best-practice way of handling IP addresses
On May 22, 8:42 pm, Benoit Cattié pup...@benoit.cattie.net wrote:
Hi,
You can get the ipadress with facter (and use it in your puppet classes,
templates ...)
That was what I also had in mind first when I needed to specify a
host's IP address as bind address in some xinetd spawned server's
config file.
However, how do you pick the proper IP address if you have to deal
with multihomed hosts like I have with most of our hosts?
This is for example what facter spits out on one such multihomed host
of ours:
$ facter|grep ipaddress
ipaddress = 192.168.1.12
ipaddress_bond0 = 192.168.1.12
ipaddress_eth0 = 10.25.218.220
ipaddress_eth2 = 10.25.139.12
ipaddress_eth2_1 = 10.25.139.15
One would assume that the variable $ipaddress is the host's real
IP, especially as it's also the one bound to the only bonded NIC.
But here it's actually the one bound to eth2
$ dig $(hostname -f) A +short
10.25.139.12
$ /sbin/ip a s eth2|grep inet\
inet 10.25.139.12/24 brd 10.25.139.255 scope global eth2
inet 10.25.139.15/24 brd 10.25.139.255 scope global secondary
eth2:1
So I thought that I could let this dilemma best be sorted out by the
host's resolver,
and by applying some of my Perl knowledge to Ruby (of which in turn I
so far almost know nothing about)
thought that some ERB markup like this within a Puppet template might
help (at least in the irb shell it seems to work):
% require 'socket' -%
% bind_ip = Socket.gethostbyname(Socket.gethostname)
[-1].unpack('C4').join('.') -%
But probably there are better solutions, especially those that Puppet
or Ruby experts would apply,
and which as a Puppet newbie I am likewise eager to hear about.
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Re: [Puppet Users] Re: Best-practice way of handling IP addresses
DWIM ralph.gro...@itdz-berlin.de writes: On May 22, 8:42 pm, Benoit Cattié pup...@benoit.cattie.net wrote: You can get the ipadress with facter (and use it in your puppet classes, templates ...) That was what I also had in mind first when I needed to specify a host's IP address as bind address in some xinetd spawned server's config file. However, how do you pick the proper IP address if you have to deal with multihomed hosts like I have with most of our hosts? Hah! You don't, because those facts were written to match the vague relationship that distributions express (one IP per device) rather than the reality of the relationships. [...] $ /sbin/ip a s eth2|grep inet\ inet 10.25.139.12/24 brd 10.25.139.255 scope global eth2 inet 10.25.139.15/24 brd 10.25.139.255 scope global secondary eth2:1 NB: That tagging of that second address as 'eth2:1' is not necessary, and many of our servers have secondary addresses without any of the alias mess attached. Just sayin' [...] But probably there are better solutions, especially those that Puppet or Ruby experts would apply, and which as a Puppet newbie I am likewise eager to hear about. I would strongly suggest you are going about this the wrong way: if you have a multi-homed host, and you need to bind the service to a specific IP address, you have a *good* reason for doing that. So, specify to your service which address it should be bound to, rather than trying to do something magical about it all. Tell the system which IP you need the service to be listening on. Otherwise, if you don't actually have a good reason, or know which IP it should be bound to, why are you trying to bind it to an IP anyhow? Daniel -- ✣ Daniel Pittman✉ dan...@rimspace.net☎ +61 401 155 707 ♽ made with 100 percent post-consumer electrons -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
Re: [Puppet Users] Re: Best-practice way of handling IP addresses
On 05/23/2010 10:08 AM, andreash wrote: Hi, I think the idea with the static DHCP leases is a good one :) But even then, wouldn't I want to set the DHCP config via puppet, so I would need to define all the IPs inside puppet? Cheers, Andreas. On 23 Mai, 15:50, Joe McDonagh joseph.e.mcdon...@gmail.com wrote: On 05/22/2010 04:59 PM, andreash wrote: Hi, thanks for your input. I had already thought about that, but initially wanted to be able to set the ip addresses using puppet. Or is that a bad idea? Hi, you should probably use DHCP static leases, but in situations where you can't, it is possible to create a define that uses an ERB template so you can config network interfaces from inside puppet. I do this right now with Ubuntu, though I think it would be even easier on RHEL/CentOS. -- Joe McDonagh AIM: YoosingYoonickz IRC: joe-mac on freenode L'ennui est contre-révolutionnaire -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/puppet-users?hl=en. Yes, you keep the dhcpd.conf in puppet and serve it out via source or as a template via content in a file resource, then notify a dhcpd service definition. The dhcpd.conf is pretty much part of the bootstrap phase, so I don't think you'd want to rely on a stored config export/collect setup to build the file. -- Joe McDonagh AIM: YoosingYoonickz IRC: joe-mac on freenode L'ennui est contre-révolutionnaire -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
Re: [Puppet Users] Re: Best-practice way of handling IP addresses
On 05/22/2010 04:59 PM, andreash wrote: Hi, thanks for your input. I had already thought about that, but initially wanted to be able to set the ip addresses using puppet. Or is that a bad idea? Hi, you should probably use DHCP static leases, but in situations where you can't, it is possible to create a define that uses an ERB template so you can config network interfaces from inside puppet. I do this right now with Ubuntu, though I think it would be even easier on RHEL/CentOS. -- Joe McDonagh AIM: YoosingYoonickz IRC: joe-mac on freenode L'ennui est contre-révolutionnaire -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
[Puppet Users] Re: Best-practice way of handling IP addresses
Hi, I think the idea with the static DHCP leases is a good one :) But even then, wouldn't I want to set the DHCP config via puppet, so I would need to define all the IPs inside puppet? Cheers, Andreas. On 23 Mai, 15:50, Joe McDonagh joseph.e.mcdon...@gmail.com wrote: On 05/22/2010 04:59 PM, andreash wrote: Hi, thanks for your input. I had already thought about that, but initially wanted to be able to set the ip addresses using puppet. Or is that a bad idea? Hi, you should probably use DHCP static leases, but in situations where you can't, it is possible to create a define that uses an ERB template so you can config network interfaces from inside puppet. I do this right now with Ubuntu, though I think it would be even easier on RHEL/CentOS. -- Joe McDonagh AIM: YoosingYoonickz IRC: joe-mac on freenode L'ennui est contre-révolutionnaire -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/puppet-users?hl=en. -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
[Puppet Users] Re: Best-practice way of handling IP addresses
Hi, thanks for your input. I had already thought about that, but initially wanted to be able to set the ip addresses using puppet. Or is that a bad idea? Cheers, Andreas. On 22 Mai, 20:42, Benoit Cattié pup...@benoit.cattie.net wrote: Hi, You can get the ipadress with facter (and use it in your puppet classes, templates ...) Benoit Le 22/05/2010 11:08, andreash a écrit : Hi, naturally, there are many places in a typical puppet manifest where one needs to use IP addresses: * network config * Listen directives in server daemons * hosts file * ... I was wondering if there is some 'best practice' way of specifying the IP addresses of all the hosts in one place and then using these variables whenever necessary? (BTW, are there global variables in puppet?) Thanks for your insight, Andreas -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/puppet-users?hl=en. -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
Re: [Puppet Users] Re: Best-practice way of handling IP addresses
It's usually much easier to use DHCP for desktops, and some servers. Also, the computer will (usually) need an ip address before the first puppet run. On May 22, 2010, at 1:59 PM, andreash wrote: Hi, thanks for your input. I had already thought about that, but initially wanted to be able to set the ip addresses using puppet. Or is that a bad idea? Cheers, Andreas. On 22 Mai, 20:42, Benoit Cattié pup...@benoit.cattie.net wrote: Hi, You can get the ipadress with facter (and use it in your puppet classes, templates ...) Benoit Le 22/05/2010 11:08, andreash a écrit : Hi, naturally, there are many places in a typical puppet manifest where one needs to use IP addresses: * network config * Listen directives in server daemons * hosts file * ... I was wondering if there is some 'best practice' way of specifying the IP addresses of all the hosts in one place and then using these variables whenever necessary? (BTW, are there global variables in puppet?) Thanks for your insight, Andreas -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/puppet-users?hl=en. -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en. -- You received this message because you are subscribed to the Google Groups Puppet Users group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
