[lvs-users] netmask for vip?

linbo liao llbgurs at gmail.com
Wed Jun 21 15:20:52 BST 2017


I am not sure.

If I configure vip netmask, and use  `ip a`  it will print vip with netmask
information.  But  `-M netmask` is show in `ipvsadm -Ln`.

I think there are different thing.

Thanks,
Linbo


2017-06-21 22:01 GMT+08:00 Aaron West <aaron at loadbalancer.org>:

> Linbo,
>
> Yes, I believe it will be exactly the same, sorry for referencing
> Ldirectord it's just what I'm used to using.
>
> Did a quick google to verify my thoughts and this page backs me up as well
> as being a nice read in itself:
> http://www.ducea.com/2008/06/16/lvs-persistence/
>
> Aaron West
>
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> On 21 June 2017 at 14:37, linbo liao <llbgurs at gmail.com> wrote:
>
> > Sorry I miss the detailed information.
> >
> > I mean the netmask of VIP in LVS director. LVS use keepalived to do HA.
> > Will vip netmask in LVS director affect the persistence ?
> >
> > 2017-06-18 16:30 GMT+08:00 Aaron West <aaron at loadbalancer.org>:
> >
> > > Hi Linbo,
> > >
> > > I assume you mean on the loopback adapter? If so then use a
> > 255.255.255.255
> > > or /32 for safety, not all OS's may need it as there can be many ways
> to
> > > make it not respond to ARP, however, this also helps as you are telling
> > the
> > > OS it's a single address.
> > >
> > > Or do you mean the "netmask" in the ldirectord config which affects
> > > persistence? When this is at the default of 255.255.255.255 persistence
> > > will work per source address so 192.168.0.10 and 192.168.0.11 would get
> > > stuck to different servers. If you set 255.255.255.0 then they would
> both
> > > hit the same server as persistence would work by subnet so the whole
> > > 192.168.0.0/24 subnet would be stuck to the first server.
> > >
> > > Hope that's relevant to your question and makes sense...
> > >
> > >
> > > Aaron West
> > >
> > > Loadbalancer.org
> > > www.loadbalancer.org <https://www.loadbalancer.org/?gclid=ES2017>
> > >
> > > <https://plus.google.com/+LoadbalancerOrg>
> > > <https://twitter.com/loadbalancerorg>
> > > <http://www.linkedin.com/company/3191352?trk=prof-exp-company-name>
> > > <https://www.loadbalancer.org/?category=company&post-name=
> > > overview&?gclid=ES2017>
> > > <https://www.loadbalancer.org/?gclid=ES2017>
> > > +1 888 867 9504 / +44 (0)330 380 1064
> > > aaron at loadbalancer.org
> > >
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> > > deployment-guides&?gclid=ES2017>
> > >  | BLOG <https://www.loadbalancer.org/?category=blog&?gclid=ES2017>
> > >
> > > On 18 June 2017 at 01:16, linbo liao <llbgurs at gmail.com> wrote:
> > >
> > > > If vip 192.168.0.111 from subnet 192.168.0.0/24, and no netmask
> > support
> > > in
> > > > configuration, the default netmask is 255.255.255.255. I test default
> > > > netmask, looks everything works fine.
> > > >
> > > > So what's the proper netmask for vip, 255.255.255.255 or
> 255.255.255.0?
> > > >
> > > > Thanks,
> > > > Linbo
> > > > _______________________________________________
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