[CentOS] Virtual IP

Thu Jul 6 14:41:01 UTC 2017
Scott Robbins <scottro11 at gmail.com>

On Thu, Jul 06, 2017 at 08:17:17AM -0400, Jonathan Billings wrote:
> On Thu, Jul 06, 2017 at 11:17:12AM +0300, Amine Tengilimoglu wrote:
> >    i need your helps on setting the virtual ip. I am trying to setup static
> > virtual ip on CenOS7.  but I want my VIP to should not open when rebooting.
> It looks like you're trying to add the second IP on an aliased
> interface, something that you used to have to do in older releases of
> CentOS.
> In C7, you just add multiple IPs to the interface, no need to use
> eth0:1 style names.
> In the ifcfg-<device>, you can just put in IPADDR1= and
> The documentation is in
> /usr/share/doc/initscripts-9.49.37/sysconfig.txt (part of the
> initscripts package), which says:

There's a clearer explanation, IMHO, with examples, here.

I don't see mention of it in the RHEL-7 release notes, they just say NM is
better than it was, and perhaps there's an easy way to do it with NM.

I've left the text that J.Billings kindly included, in below.

>   Base items:
>     NAME=<friendly name for users to see>
>       Most important for PPP.  Only used in front ends.
>     DEVICE=<name of physical device (except dynamically-allocated PPP
>       devices where it is the "logical name")>
>     IPADDRn=
>     PREFIXn=
>       Network prefix.  It is used for all configurations except aliases
>       and ippp devices.  It takes precedence over NETMASK when both
>       PREFIX and NETMASK are set.
>     NETMASKn=
>       Subnet mask; just useful for aliases and ippp devices.  For all other
>       configurations, use PREFIX instead.
>     The "n" is expected to be consecutive positive integers starting from 0.
>     It can be omitted if there is only one address being configured.
> So, you can have IPADDR0, IPADDR1, IPADDR2, etc.
> All of these will configure an IP on the device named in the DEVICE
> line.  No need to have multiple alias interfaces.
> -- 
> Jonathan Billings <billings at negate.org>
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Scott Robbins
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