Re: Method to move a single or multiple pods to a different node?

[Per Carlson]

On 12 July 2017 at 00:50, G. Jones  wrote:

> That’s just it, the masters were unschedulable. During the outage wer
> restarted the masters and nodes but the nodes wouldn’t come online. While
> we were working on getting the nodes up the pods had been restarted on the
> masters but they were never set as schedulable. When everything was finally
> up and running I did an oc describe node and found that pods were spread
> across the masters and nodes without me explicitly setting the masters as
> schedulable.
>

​Sounds like a bug to me. If you still have got logs/forensics you could
file a bug report.

-- 
Pelle

Research is what I'm doing when I don't know what I'm doing.
- Wernher von Braun
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RE: Method to move a single or multiple pods to a different node?

[G. Jones]

That’s just it, the masters were unschedulable. During the outage wer restarted 
the masters and nodes but the nodes wouldn’t come online. While we were working 
on getting the nodes up the pods had been restarted on the masters but they 
were never set as schedulable. When everything was finally up and running I did 
an oc describe node and found that pods were spread across the masters and 
nodes without me explicitly setting the masters as schedulable.

 

 

  _  

From: Per Carlson [mailto:pe...@hemmop.com] 
Sent: Tuesday, July 11, 2017 12:46 AM
To: G. Jones
Cc: openshift
Subject: Re: Method to move a single or multiple pods to a different node?

 

Hi.

 

On 8 July 2017 at 21:45, G. Jones  wrote:

I’ve got an Origin 1.5 environment where, during an outage with my nodes, pods 
got relocated to my masters fairly randomly. I need to clean it up and get the 
pods back where I want them but have not yet found a way to do this. The only 
way I see to move pods between nodes is to scale to two replicas, mark one node 
as unschedulable and evacuate to the other node, then scale down to one. Is 
there a way to move single or multiple pods between nodes?

 

​

If you don't want any PODs on the masters, why not making them unschedulable​? 
Having the masters acting as a node in the event of failures sounds fragile to 
me (a POD could potentially consume all resources on the master and thus 
causing cluster wide instability). 

 

-- 

Pelle

Research is what I'm doing when I don't know what I'm doing.
- Wernher von Braun

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Re: Method to move a single or multiple pods to a different node?

[Per Carlson]

Hi.

On 8 July 2017 at 21:45, G. Jones  wrote:

> I’ve got an Origin 1.5 environment where, during an outage with my nodes,
> pods got relocated to my masters fairly randomly. I need to clean it up and
> get the pods back where I want them but have not yet found a way to do
> this. The only way I see to move pods between nodes is to scale to two
> replicas, mark one node as unschedulable and evacuate to the other node,
> then scale down to one. Is there a way to move single or multiple pods
> between nodes?
>
> ​
If you don't want any PODs on the masters, why not making them
unschedulable​? Having the masters acting as a node in the event of
failures sounds fragile to me (a POD could potentially consume all
resources on the master and thus causing cluster wide instability).

-- 
Pelle

Research is what I'm doing when I don't know what I'm doing.
- Wernher von Braun
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Re: Method to move a single or multiple pods to a different node?

[Avesh Agarwal]

On Sat, Jul 8, 2017 at 3:45 PM, G. Jones  wrote:

> I’ve got an Origin 1.5 environment where, during an outage with my nodes,
> pods got relocated to my masters fairly randomly. I need to clean it up and
> get the pods back where I want them but have not yet found a way to do
> this. The only way I see to move pods between nodes is to scale to two
> replicas, mark one node as unschedulable and evacuate to the other node,
> then scale down to one. Is there a way to move single or multiple pods
> between nodes?
>
Actually in this scenario it seems to me, the only way is to kill pods
where you dont want them so that when they are recreated, the scheduler
will schedule them by spreading evenly. So what you are suggesting is one
way, and another way obviously is directly kill pods where you dont want
them. In the future, a rescheduler (
https://github.com/kubernetes/features/issues/109) should help with it :-).

>
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Method to move a single or multiple pods to a different node?

[G. Jones]

I've got an Origin 1.5 environment where, during an outage with my nodes,
pods got relocated to my masters fairly randomly. I need to clean it up and
get the pods back where I want them but have not yet found a way to do this.
The only way I see to move pods between nodes is to scale to two replicas,
mark one node as unschedulable and evacuate to the other node, then scale
down to one. Is there a way to move single or multiple pods between nodes?

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