We use routable addresses on loopback devices when we have a pool of
servers all answering to the same (Service) IP address to do some
service with load balancing with the Linux Virtual Server load
balancing. The LVS server answers for the (Service )IP address and then
forwards the packet via mac address to the right application server.
Each application server has the Service IP on a loopback interface and
doesn't arp for it. It works great. We load balance pools of inbound
mail servers, clusters of web servers, anything that does independent
transactions that can be spread over a pool of servers.
On Thu, 2012-09-06 at 16:08 -0500, Diego Zamboni wrote:
> Aliaksei,
>
> Honestly, I had never heard of a loopback interface being assigned a
> routable IP address. I guess this is why CFEngine ignores it when
> collecting information about the system. This seems to be hardcoded
> behavior, don't know how easy it would be to change.
>
> --Diego
>
>
> On Sep 3, 2012, at 9:58 AM, Aliaksei Sheshka <sheshka...@gmail.com> wrote:
>
> > Hi list!
> >
> > I'm trying to setup cfengine on my network and faced unexpected behavior.
> > Most of my linux nodes have routable IPs defined under lo interface,
> > like 192.168.1.5/32 192.168.78.25/32 and so on,
> > but looks like cfengine doesn't define class with the IPs of the
> > loopback interface. Is it intended behaviour, if so, why ?
> > Then running /var/cfengine/bin/cf-promises -v I'm getting:
> > Defined classes = { 64_bit 8_cpus Afternoon Day3 GMT_Hr14 Hr14 Hr14_Q3
> > Lcycle_2 Min35 Min35_40 Monday PK_MD5_c7d182a7a3561105b17ce0b7d207c59c
> > Q3 September Yr2012 any as6453_net cfengine cfengine01
> > cfengine01_as6453_net cfengine_3 cfengine_3_3 cfengine_3_3_5 common
> > community_edition compiled_on_linux_gnu debian debian_6 debian_6_0
> > have_aptitude linux linux_2_6_32_5_vserver_amd64 linux_x86_64
> > linux_x86_64_2_6_32_5_vserver_amd64
> > linux_x86_64_2_6_32_5_vserver_amd64__1_SMP_Sun_May_6_06_53_58_UTC_2012
> > net verbose_mode x86_64 }
> > That can be done about that ? Assigning routable IPs to loopback is a
> > relatively common thing in the a) multihomed environments b)
> > containerized environments (linux-vserver, FreeBSD jails).
> > _______________________________________________
> > Help-cfengine mailing list
> > Help-cfengine@cfengine.org
> > https://cfengine.org/mailman/listinfo/help-cfengine
>
> _______________________________________________
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> Help-cfengine@cfengine.org
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>
>
--
Daniel R. Bidwell | bidw...@andrews.edu
Andrews University | Information Technology Services
If two always agree, one of them is unnecessary
"Friends don't let friends do DOS"
"In theory, theory and practice are the same.
In practice, however, they are not."
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