Re: [Keepalived-devel] Start keepalived without IP on interface?

[Paul G. <gi...@tc...>]

Thanks Quentin, I'll download and try that. Seems promising.
Another question, is it possible to run multiple instances of the keepalive
daemon on the same host? I tried setting a pidfile for it and the command
seemed to take (no errors), however the second instance didn't start and
there were no logs printed.

paul@paul:/etc$ keepalived -f /etc/keepalived2.conf --dont-fork
--log-console -p /var/run/test.pid
paul@paul:/etc$
paul@paul:/etc$ ps ax | grep keep
18248 pts/39   Z    0:00 [keepalived] <defunct>
21726 ?        Ss    0:00 /usr/sbin/keepalived -f /etc/keepalived.conf
21727 ?        S      0:00 /usr/sbin/keepalived -f /etc/keepalived.conf
21728 ?        S      0:00 /usr/sbin/keepalived -f /etc/keepalived.conf

--
Paul


On 29 June 2018 at 12:10, Quentin Armitage <qu...@ar...> wrote:

> Can you try keepalived v2.0.5. The version 2.0.x series supports "dynamic"
> interfaces, in other words using an interface that doesn't exist when
> keepalived starts, but is subsequently created. You might need to add the
> keyword "dynamic_interfaces" in the global_defs section of your
> configuration.
>
> To be honest, I'm not sure if it will work, since I have never thought
> about this situation. If it doesn't work, then I think keepalived should be
> modified so that the vrrp instance is in fault state until the underlying
> interface has an address.
>
> Quentin Armitage
>
> On Fri, 2018-06-29 at 11:02 +0100, Paul Gildea wrote:
>
> I'm new to keepalived. I want to use keepalived on an interface that will
> get an IP at some point but will not have one initially, can I set this up
> somehow in the config? If I try to start it now keepalived errors out as
> keepalived doesn't know what source IP address to use when sending VRRP
> packets. If this is not possible I presume I could set up a dummy IP and
> remove it after keepalived starts or script keepalived to start after the
> interface gets a valid IP, just wondering is it possible to start without
> said IP and I just can't find out how to do it.
>
> Conf:
>
> ! Configuration File for keepalived
>
>     vrrp_instance VI_1 {
>         state MASTER
>         interface eth0
>         virtual_router_id 51
>         priority 150
>         advert_int 1
>         authentication {
>             auth_type PASS
>             auth_pass pwd
>         }
>         virtual_ipaddress {
>            192.168.0.13
>         }
>         notify /etc/state_change.py
>     }
>
> Log:
>
>     keepalived -f /etc/keepalived.conf --log-console --dont-fork
>     Thu Jun 28 11:25:53 2018: Starting Keepalived v1.4.4 (05/08,2018)
>
>     Thu Jun 28 11:25:53 2018: Running on Linux 4.7.8 #9 SMP Wed Jun 27
> 17:25:18 IST
>     2018 (built for Linux 4.7.8)
>
>     Thu Jun 28 11:25:53 2018: Opening file '/etc/keepalived.conf'.
>
>     Thu Jun 28 11:25:53 2018: Starting Healthcheck child process,
> pid=18886
>     Thu Jun 28 11:25:53 2018: Starting VRRP child process, pid=18887
>
>     Thu Jun 28 11:25:53 2018: Opening file '/etc/keepalived.conf'.
>
>     Thu Jun 28 11:25:53 2018: Registering Kernel netlink reflector
>
>     Thu Jun 28 11:25:53 2018: Registering Kernel netlink command channel
>
>     Thu Jun 28 11:25:53 2018: Registering gratuitous ARP shared channel
>
>     Thu Jun 28 11:25:53 2018: Opening file '/etc/keepalived.conf'.
>
>     Thu Jun 28 11:25:53 2018: WARNING - default user 'keepalived_script'
> for script
>     execution does not exist - please create.
>
>     Thu Jun 28 11:25:53 2018: (VI_1): Cannot find an IP address to use for
> interface
>      eth0
>
>     Thu Jun 28 11:25:54 2018: Stopped
>
>     Thu Jun 28 11:25:54 2018: Keepalived_vrrp exited with permanent error
> CONFIG. Te
>     rminating
>
>     Thu Jun 28 11:25:54 2018: Stopping
>
>     Thu Jun 28 11:25:54 2018: Stopped
>
> Thanks,
>
> --
> Paul
>
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