[Samba] 答复: 答复: How to disable CTDB pulling up NICs

[Weidong]

Thank you very much for reply. Our test team insists on simulating network failure by using ifdown instead of just unpluging the cable. I have to modify the event script 10.interface. When noticing a NIC failure, CTDB just marks the NIC down and do not try to pull it up. It seems to work fine.

-----邮件原件-----
发件人: Martin Schwenke [mailto:martin at meltin.net]
发送时间: 2016年9月18日 18:49
收件人: Weidong via samba
抄送: weidong 12656 (RD)
主题: Re: [Samba] 答复: How to disable CTDB pulling up NICs

On Sun, 18 Sep 2016 01:36:20 +0000, Weidong via samba <samba at lists.samba.org> wrote:

> If eth0 holds virtual IP as its secondary IP and I bring down eth0 by
> command "ifdown eth0", CTDB will automatically pull eth0 up. Sometime
> it goes wrong. The virtual IP becomes primary IP, and origin primary
> IP turns into a secondary IP or just missing. If the origin primary IP
> is missing, I have to run "ifup eth0" though CTDB has pulled eth0 up.

Why do you want to take an interface down if it is used for CTDB public IP addresses?

An interface that hosts CTDB public IP addresses should be used only for that purpose.  You can put a static address on that interface, which can help the node reach infrastructure (e.g. DNS or Active Directory server) but there should never be a need to take the interface down.

You should use another, separate private network for the fixed, private node IP addresses.

If you need to do anything else then you should consider a 3rd network.

> CTDB uses “ip link set eth0 up” to pull up a NIC. I suppose
> “ifdown/ifup” are not compatible with “ip link set”.

Depending on your platform, the ip command (as in "ip link set") might be used as a low-level primitive in the implementation of ifdown/ifup.

You can not expect to be doing arbitrary network configuration on an interface while CTDB is trying to use and manage it...

peace & happiness,
martin
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