[one-users] keepalived: problem implementing virtual ip

[Jaime Melis]

Hi,

The approach I would take to solve this is to write my own script that
reads the information from /mnt/context/context.sh and configures the
second IP for eth0. You can send this script along with the init.sh in the
FILES attribute.

The script would be as simple as: ifconfig eth0:1 $IP_PUBLIC/$NETMASK up

regards,
Jaime


On Thu, Oct 18, 2012 at 1:09 PM, Lim Kean Meng <km.lim at mimos.my> wrote:

>  I think I found why not any ip just bind to eth0, the ip must be defined
> in context.sh.  In other words, the vm’s network do not recognize any other
> ip except the one define in context.sh, see below:****
>
> ** **
>
> Q: since I’ll need 2 ip to bind to the same interface on eth0, how do I
> force the 2nd ip to be registered into context.sh?****
>
> ** **
>
> root at one-dev04:/srv/cloud/one/var/262# more context.sh****
>
> # Context variables generated by OpenNebula****
>
> BROADCAST="10.4.104.255"****
>
> DNS="192.228.137.100"****
>
> FILES="/var/lib/one/vm-templates/ONE-centos/centos-init.sh"****
>
> GATEWAY="10.4.104.254"****
>
> HOSTNAME="CentOS-6.2-x64"****
>
> IP_PUBLIC="10.4.104.119"****
>
> NETMASK="255.255.255.0"****
>
> NETWORK="10.4.104.0"****
>
> TARGET="hdb"****
>
> ****
>
> ** **
>
> Thanks and best regards.****
>
> ** **
>
> ** **
>
> Lim****
>
> ** **
>
> *From:* Lim Kean Meng
> *Sent:* Wednesday, 17 October, 2012 4:50 PM
> *To:* 'users at lists.opennebula.org'
> *Subject:* keepalived: problem implementing virtual ip****
>
> ** **
>
> I want to setup a load balance to point to 2 VM in opennebula using
> keepalived, refer to ww.keepalived.org****
>
> I am having problem when implementing virtual ip or vip.  ** **
>
> The vip which is actually an arbitrary ip in the same network  can bind to
> my VM eth0 (this is the master server) and if the master is down, the vip
> will float and bind to the standby VM eth0.****
>
> ** **
>
> But the vip cannot be ping from other VM except the VM that is binding the
> vip as below.  Here my vip is 10.4.104.88 and my master and standby VM are
> 10.4.104.28 and 10.4.104.91 respectively, available below.****
>
> ** **
>
> [root at DW-LB01-253 ~]# ping 10.4.104.88****
>
> PING 10.4.104.88 (10.4.104.88) 56(84) bytes of data.****
>
> 64 bytes from 10.4.104.88: icmp_seq=1 ttl=64 time=0.127 ms****
>
> ^C****
>
> --- 10.4.104.88 ping statistics ---****
>
> 1 packets transmitted, 1 received, 0% packet loss, time 760ms****
>
> rtt min/avg/max/mdev = 0.127/0.127/0.127/0.000 ms****
>
> ** **
>
> [root at DW-LB02-254 ~]# ping 10.4.104.88****
>
> PING 10.4.104.88 (10.4.104.88) 56(84) bytes of data.****
>
> ^C****
>
> --- 10.4.104.88 ping statistics ---****
>
> 1 packets transmitted, 0 received, 100% packet loss, time 804ms****
>
> ** **
>
> [root at DW-LB01-253 ~]# ip add sh eth0****
>
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
> UP qlen 1000****
>
>     link/ether 02:00:0a:04:68:1c brd ff:ff:ff:ff:ff:ff****
>
>     inet 10.4.104.28/24 brd 10.4.104.255 scope global eth0****
>
>     inet 10.4.104.88/32 scope global eth0****
>
>     inet6 fe80::aff:fe04:681c/64 scope link****
>
>        valid_lft forever preferred_lft forever****
>
> ** **
>
> [root at DW-LB02-254 ~]# ip add sh eth0****
>
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
> UP qlen 1000****
>
>     link/ether 02:00:0a:04:68:5b brd ff:ff:ff:ff:ff:ff****
>
>     inet 10.4.104.91/24 brd 10.4.104.255 scope global eth0****
>
>     inet6 fe80::aff:fe04:685b/64 scope link****
>
>        valid_lft forever preferred_lft forever****
>
> ** **
>
> ** **
>
> Thanks and best regards.****
>
> ** **
>
> ** **
>
> Lim****
>
> ** **
>
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>
>


-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org
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