Kubernetes SIG Network, 6 Dec 2018

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From YouTube: Network Plumbing WG Meeting 2018-12-06

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Kubernetes Network Plumbing Working Group meeting for 2018-12-06

A

All right, recording is on welcome to the network plumbing working group meeting for Thursday December 6th 2018. The first item on the agenda is keep coming meet up.

A

So you're up Doug all.

B

Right cool, yeah, so I guess, while we've got the usual suspects online, we can get maybe a little bit more of a organic discussion about what generally would be a good time.

B

You know I've got the thread on sig net worth, but as Mike noted, it's like not great for like expressing a range of when is good in terms of like this is a goodish versus this is really good type of thing. It's a little bit more binary, so maybe you could see I mean it's like Fung had put down that Tuesday morning was good like early on Tuesday morning. That's good ish for me as well.

B

You know probably I think Monday is basically out for me, so anyone else want to give a general general time ish. So.

C

First of all, how long do we want to me for an hour or what? What is the timeline you.

B

Know what I'd say that an hour is probably sufficient an hour, maybe 90 minutes, but you know.

D

Probably an hour is.

B

Good and okay be nice to have the in-person factor. Okay,.

C

If it's an hour that I think it's a little easier to fit in I feel like I think so. Tuesday does not work for me at all other than early morning. That's the same for now. I would also vote against. I would vote against Thursday, because I suspect people leave yep at least Wednesday right so Wednesday or early Tuesday morning. If people want to get up like I mean not that early right, so I mean like what 9 or something nine o'clock might work on Tuesday yeah. So something like that is one option.

C

Wednesday at the same time would be fine to.

E

Nine o'clock Tuesday is the opening keynote.

A

Mic just kidding.

C

Well, isn't isn't that the same for Wednesday as well, yeah.

A

I think every day has okay.

C

So so it's a we're saying: let's not, let's try not to schedule over keynote.

A

So Tuesday 9:00 is yeah, I mean keynotes, go from like 9:00 to 10:00 20. The first breaks at 10:20.

E

Right I mean the yeah I mean the problem is basically this conference has no, you know open or unconference time right, yeah, no space for buffs or anything else and formal like this, so I think. For me the least interesting sessions are actually the first ones on Tuesday, so like from 1020 to 1140.

E

I would be least unhappy about missing, maybe the ones at 11:40, but after that I think there's a lot of interesting stuff. For me.

A

So you said you're out completely for Tuesday Phung right except in the early morning. Correct okay. Does that mean you know?

A

Does that mean like anytime after 10 o'clock, you're booked? Yes,.

C

10:30, 10:30 or so and I think that's also true for for me.

B

Too yeah I.

A

Don't know might be true for me: I haven't, checked it and yeah. Probably is it true for me, please tell me I think you have that dock up on your computer already.

B

I'm good Wednesday afternoon, almost anytime Wednesday afternoon,.

C

Personally, so I think someone has a session yeah.

F

Three to full each time so we coming to after can.

C

We do like, after that, about how about, after your session, Tomo, okay, yep I'd, say.

F

C

F

The maybe the the four five five to six, so they are I'm. The my presentation will be handed at the 4:15 or something like that, so so 4:35 at that time, I will join the the middle of the meeting. I could do.

A

And time after 4:00 on Wednesday I have something from 3:00 to 4:00. Okay,.

C

So maybe four maybe 4:30, you know yeah.

A

It's worth a shot about.

C

E

I think I really want to go to one of the sessions at 4:30. So if you do for I'll join you for the first half.

C

What about after.

E

Okay, yeah well, there's the party at 6:00 but yeah after the last session before the party that would work for me.

C

E

Yeah I guess they're, probably gonna start transportation. I, don't know the party specific.

B

E

The last session I see these sessions or what they're about 40 minutes yeah.

B

E

The last session land about 510, so you know between 5:15 and 6,.

B

You guys wanna, do you want to say that I want to say 5:15 to 6:15 and tail off? At the end, I mean the the bottom line. I, don't think that we need anything. Ultra formal I, just think that it would be nice to get to see one another. We can. We can chat about you.

C

B

C

Don't we do to a four o'clock? Why don't? If that's the case? Let's not, because if the party starts at 6:00 and we're throwing or if it is somebody is going to the party, then they probably need transportation at like five or something like that right. So, let's not even risk that you know why? Don't we just do four and then you know and then we'll schedule four to five and who can join in you know all that right: okay, okay,.

C

B

C

So, let's, let's try that four.

B

To five I will make a response.

C

F

B

And okay, sorry, but I will send out an invite and also.

F

B

Will determine the location, that's what I was going to say where yeah so yeah, hopefully we're early enough. We can use one of the Red Hat meeting rooms that are available and they'll be. Are you okay? Okay,.

C

Alright, with our luck what's gonna happen is now you're gonna log into that tool and you're.

G

Gonna see that's the only blog, that's blocked off.

C

To check a little bit all.

D

Right I'm gonna check right now: okay, okay, thanks right.

A

All right so, while he's doing that any follow up from the new meeting time phone are we gonna try to go with the earlier time, regardless of Israel? No.

C

I think that time is good for Israel.

A

Okay, I must have misread.

C

A

C

The time was really not good. Our current time is not good for Israel, because it's midnight once we change it. It will only be horrible for West Coast, which I don't think anybody's farming West Coast so should be. We should be fairly safe, yeah.

A

I think sometimes is it Bowie or insurance show up, but I've seen them in a couple of meetings yeah, but you know I I'm, not sure, even if they have shown up that they've ever said anything. Okay anyway, they probably just listening in okay. That's all I can think of I mean I yeah.

A

There have been people in the past from the west coast and I. Don't think we want to you know intentionally. You know, shut people out, but we haven't had too many from the west coast recently, okay, so yeah I think that's okay. Why don't we make that decision on the mailing list? Give people one more chance to object and if they don't we'll just call it a time or call it D time for the next meeting, yeah.

C

We give it one more week or is that is that enough time or actually do less well.

A

I think like I mean the next meeting December 20th, you know which I think we all said that we would hold yeah. Let's just put that out, there say hey. We are gonna change this time unless anybody we're going to change to this time unless anybody really strenuously rejects and Norman next week, we can just change the invite and everything like that. If we don't get any objections, okay, okay and hopefully, then we can try to get a little bit more involvement from Europe as well, which you know it's been a problem. You asked right.

A

E

If you start on the December 20th, the first two meetings will be perhaps unusually low anyway because of the date in terms of attendance. Yes, yeah.

A

That would be to be expected.

C

A

Mean is that a problem Mike or is just kind of a I just.

E

Yeah, just we should draw any conclusions that, based on the first two meetings, you're yeah.

A

All right, I'll just make some notes of that on the.

B

Phone, you were right on I look. Yesterday it's wide open, I look today there are like three.

F

B

A

Can you just meet at the party.

C

We could, but that's not a great you know, place.

B

C

That's the thing in.

E

Some venues: they don't let you in early yeah.

C

Okay: let's try to let's see what we can do.

C

Thank you, my hat here look at look at other times. What are the other times available.

B

So, let's once I.

A

Mean that said, if that time works for all of us, then do we necessarily need to do it in one of those rooms or could we even bring somewhere else like I, don't look elsewhere right.

B

A

Should do that too?.

B

Yeah right, you know what maybe the maybe the thing to do is to say: let's have, let's use an impromptu space, though they'll probably be some table set up for you know your average hacking etc. So there'd.

E

Better be I mean that's the whole point of a conference. Yeah.

C

So, in that case, one of the things I think we need to do is get a communication method so that we can so we can know where to go at that time. Well, there's the networking slot.

E

Channel networking six like channel, if nothing else, okay, that.

C

B

All right, let's do that I will I'll put an update to the mailing list thread and I will mention that the official communication method will be through Sigma networks, life, okay,.

C

Are you going to send a meeting you might Doug.

B

I will set up a meeting, invite and yeah. Hopefully you can make just a public Google one that I can run so yeah, okay,.

A

All right next up I had a proposal for updating the spec, which I think is pretty concrete.

A

The problem is basically that we were following some convention from CNI when we specified the static IPS in the network selection, annotation, and that convention did not include a network prefix for the IP address. So our documents do not talk about that explicitly, but it turns out that for static, IP use cases where there is no other configuration around subnets or ranges that doesn't really work, because then that plug-in has no idea what that network prefix should be. So.

A

My proposal is that we should change section four one: two dot one dot three to read what it reads there and that the text in the agenda would replace that section in the CRD spec and basically the changes there are to indicate that the valid ipv4 or ipv6 address.

A

Let me highlight the changed part really quick and you can follow along with me in the oh, that's nasty.

A

There we go and also let's do this part.

A

So those two parts marked in green are the changed parts, basically just a state that the network prefix is optional for those addresses just to allow existing CNI plugins like host local, to continue working, but that if plugins require a prefix, they are allowed to fail. The attachment request, if they do not receive one basically I, think the upstream recommendation will be that plugins should accept a prefix and that users should probably is a prefix, no matter what, when they can configure these things and by when I say upstream, I means CNI upstream.

A

It was kind of an oversight in the conventions and I have a PR out to change that oversight, but for backwards compatibility.

A

Specified and required for most plugins, not.

E

Yes and you getting in the question I had do we have situations where the plug-in already knows what the prefix.

A

Should be yes, so host local requires basically host local will farm out addresses out of the subnet that it is configured for, but you can request a specific address out of that subnet and if that address is not already allocated, it will give you that address right and it's very easy for a host local to take a bear, IP address without prefix and say: oh hey. This range that I already have configured contains the scipy. Therefore I know what the prefix would be right.

E

Definitely I was thinking about is, if, for the case, where the plug-in already knows what the prefix should be, if the user specifies a different prefix, there's a problem. Yes,.

A

And is not covering my current proposal. I guess I would assume that the plug-in would fail that, because the prefix was mismatched, I think.

E

That's the right answer. Yes, okay,.

A

I say if prefix is incompatible with existing plug-in configuration or just if the network prefix is trying to think of a good word here. Yeah.

E

You could just stop short and say unacceptable. Okay, unacceptable.

D

E

Do have one other kind of nerdy writing, NIT and I haven't had time to review the rest of the document to see if what, if it has a position on this, but you mean prefix length when you say prefix right and sometimes by prefix people actually mean the you know a certain subset of the bits.

A

Of the address, yeah should I, say, network prefix length or just prefix length either.

E

Works for me: okay, I'll just go long.

A

Let's see here actually I, don't like that wording, but yeah thanks anonymous, Kiwi, whoever you are for updating it. Okay, plugins are allowed to fill the attachment requests if they require a network prefix length, but.

E

First, oh, this should be request rather than an request, because we're all talking about a specific request. Okay, sorry.

A

Where are you at oh here.

E

A

Try this the attachment request: Oh but yeah. The request is: okay, got it.

D

A

D

We'll just go with that.

A

Okay, all right I like that, we'll go with that. So if that sounds good.

A

We could just go with that and I could update the document, but what I think I'm going to do is leave it, because I think we probably want to update this document the spec a little bit more to clarify that we are now on like version 1.1 or something like that, so I will go through and try to do that and then bring in this text. When I do that, and then we should probably have to change your section to note which stuff has been changed.

A

Anything else on this one I have one more kind of specky thing in agenda that I'm done.

A

All right, if not so this one is kind of a carryover from November, 8th I proposed to add section 7.5, which is in me like one time. Excuse me, rent time, considerations, implementation considerations. Sorry, let me figure out what that section is actually named that run time and implementations. Considerations is the section and we would add a section or an item to that section to say that any runtime configured Cabernets to the implementation via CNI Jason configuration, must not be passed to you or applied by network attachments other than the cluster wide default network.

A

Kubernetes expects these options to apply to only the cluster. Why default network and they may not be generally applicable, didn't.

E

We already discuss and agree with us. We.

A

Discussed it, but I said I was going to bring a concrete proposal. Ok.

E

A

And that's what I tried to do here? I have not been able to bring a concrete proposal yet or wording around to add items to the network, select attachment selection, annotation for port mappings and bandwidth, but I will do that next time. Okay,.

E

This one looks good to me: okay,.

A

F

A

Right and like I said I'll do a proposal for xx to extend an attachment selection annotation but other than that I'm done.

A

Anybody have anything else. What'd you get.

A

All right any last thoughts for Kubik on before we see some of you next week. Sorry Michael.

D

A

That see some of you next week, some of you not.

D

F