[openstack-dev] [Fuel] Assigning VIPs on network config serialization
ikalnitsky at mirantis.com
Mon Oct 19 16:28:48 UTC 2015
> Not assign addresses to VIPs is a network configuration is being
> serialized for API output.
AFAIK, that's not truth. Fuel UI and OSTF relies only on *public* VIP.
So we can keep only *public* VIP, and do not assign / show others.
> Check number of IP addresses wherever it is possible to "spoil" network
> configuration: when a role get’s assigned to a node, when network
> changes or network templates are applied.
It won't work that way. What if you enable plugin when all roles are
assigned? What if you change networks, and now it's not enough IPs? Or
what if enable plugin that requires 5 VIPs in public network by
default, and it's not enough. But by using network templates you
assign this netrole to management network?
>From what I can say the proposed approach requires to put checks
here-and-there around the code. Let's do not overcomplicate things
without real need.
So let me share my thoughts regarding this issue.
* We shouldn't *allocate* VIPs when we make GET request on network
configuration handler. It should return only *already allocated* VIPs
and no more.
* VIP allocation should be performed when we run deployment.
* Before deployment checks should fail, if there's not enough VIPs or
other resources. So users fix them, and try again.
* Both Fuel UI and OSTF needs VIPs only when cluster is deployed, and
it's safe to return allocated VIPs on that stage.
So what do you think guys?
On Fri, Oct 16, 2015 at 5:25 PM, Roman Prykhodchenko <me at romcheg.me> wrote:
> Hi folks!
> I’ve been discussing several bugs [1-3] with some folks and noticed that they share the same root cause which is that network serialization fails, if there’s not enough IP addresses in all available ranges of one of the available networks to assign them to all VIPs. There are several possible solutions for this issue:
> a. Not assign addresses to VIPs is a network configuration is being serialized for API output.
> A lot of external tools and modules, i. e., OSTF, rely on that information so this relatively small change in Nailgun will require big cross-components changes. Therefore this change can only be done as a feature but it seems to be the way this issue must be fixed.
> b. Leave some VIPs without IP addresses
> If network configuration is generated for API output it is possible to leave some VIPs without IP addresses assigned. This will only create more mess around Nailgun and bring more issues that it will resolve.
> c. Check number of IP addresses wherever it is possible to "spoil" network configuration: when a role get’s assigned to a node, when network changes or network templates are applied.
> The proposal is to follow [c] as a fast solution and file a blueprint for [a]. Opinions?
> 1 https://bugs.launchpad.net/fuel/+bug/1487996
> 2 https://bugs.launchpad.net/fuel/+bug/1500394
> 3 https://bugs.launchpad.net/fuel/+bug/1504572
> - romcheg
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