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Hi,
Putchong Uthayopas wrote:
>
> HI,
>
> Are there any way to backup and restore the state of persistance connection
> from LVS kernel. (via. device interface, api etc) We can send it to backup
> node and restore when primary fail. This at least will help maintain some
> live connection.
As I said before, the design is done but the implementation is missing
in action. What you are proposing, if I understand correctly, is that you
want to have something like ipvsadm --save-tcp-state-transition-table and
then copy the whole stuff to the second node and do an ipvsadm --load-tcp-\
state-transition-table. But no, this is impossible to do and also not
desirable. Moreover, the saveing and copying and loading is non-atomic, this
means: Even if this approach would work it would be broken by design because
during the time you want to perform the kernel-table-update the original
table may have changed drastically or even the original kernel crashed. So
you would feed the spare node with false information, like false TCP-state
or the masq-timeout values or the atomic_t counter or ...
Best regards,
Roberto Nibali, ratz
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