Re: [CentOS] Virtual IP

[James Hogarth]

On 6 July 2017 at 15:41, Scott Robbins  wrote:
> 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-, you can just put in IPADDR1=1.2.3.4 and
>> NETMASK1=255.255.255.0, and PREFIX1=1.2.3.0.
>>
>> 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.
> https://community.spiceworks.com/topic/545859-add-secondary-ip-to-one-interface-in-centos-7
>
> 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=
>>   Most important for PPP.  Only used in front ends.
>> DEVICE=>   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 


Don't even go near an aliased interface on EL7 ... it's the most
painful way to handle this and not NM compatible.

Here's an article I wrote way back on handling this:

https://www.hogarthuk.com/?q=node/6

Note that with NM in use (as should be the case on EL7) it's as simple
as: nmcli con mod  +ipv4.addr "10.0.0.2/24"

https://www.hogarthuk.com/?q=node/8
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Virtual IP

[Scott Robbins]

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-, you can just put in IPADDR1=1.2.3.4 and
> NETMASK1=255.255.255.0, and PREFIX1=1.2.3.0.
> 
> 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.
https://community.spiceworks.com/topic/545859-add-secondary-ip-to-one-interface-in-centos-7

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=
>   Most important for PPP.  Only used in front ends.
> DEVICE=   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 
> ___
> CentOS mailing list
> CentOS@centos.org
> https://lists.centos.org/mailman/listinfo/centos
> 

-- 
Scott Robbins
PGP keyID EB3467D6
( 1B48 077D 66F6 9DB0 FDC2 A409 FA54 EB34 67D6 )
gpg --keyserver pgp.mit.edu --recv-keys EB3467D6

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Virtual IP

[Jonathan Billings]

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-, you can just put in IPADDR1=1.2.3.4 and
NETMASK1=255.255.255.0, and PREFIX1=1.2.3.0.

The documentation is in
/usr/share/doc/initscripts-9.49.37/sysconfig.txt (part of the
initscripts package), which says:


  Base items:
NAME=
  Most important for PPP.  Only used in front ends.
DEVICE=
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 
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Virtual IP

[Andreas Benzler]

Something like that?

DEVICE="enp2s0f1"
HWADDR="00:25:90:5C:2A:AD"
TYPE=Ethernet
NM_CONTROLLED="yes"
ONBOOT="yes"
BOOTPROTO="none"
IPADDR=192.168.100.1
NETMASK=255.255.255.0
NAME=„enp2s0f1"


> Am 06.07.2017 um 10:17 schrieb Amine Tengilimoglu 
> :
> 
> Hİ all;
> 
> 
>   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.
> 
> 
> My interface settings like this:
> 
> *for ens33 NIC -> ifcfg-ens33*
> 
> DEVICE=ens33
> BOOTPROTO=none
> ONBOOT=yes
> PREFIX=24
> IPADDR=192.168.2.151
> 
> 
> *and for VIP NIC ens33:2* * -> ifcfg-ens33:2*
> 
> DEVICE=ens33:2
> ONBOOT=no
> ONPARENT=no
> PREFIX=24
> IPADDR=192.168.2.149
> 
> i made up ifcfg-ens33:2 from ifcfg-ens33 by copying it... i dont know
> where i do wrong??
> 
> i am waiting for your help...
> 
> best regards
> ___
> CentOS mailing list
> CentOS@centos.org
> https://lists.centos.org/mailman/listinfo/centos

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

[CentOS] Virtual IP

[Amine Tengilimoglu]

 Hİ all;


   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.


My interface settings like this:

*for ens33 NIC -> ifcfg-ens33*

DEVICE=ens33
BOOTPROTO=none
ONBOOT=yes
PREFIX=24
IPADDR=192.168.2.151


*and for VIP NIC ens33:2* * -> ifcfg-ens33:2*

DEVICE=ens33:2
ONBOOT=no
ONPARENT=no
PREFIX=24
IPADDR=192.168.2.149

i made up ifcfg-ens33:2 from ifcfg-ens33 by copying it... i dont know
 where i do wrong??

i am waiting for your help...

best regards
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos