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AWS ALB Connection Draining not Closing Connections after Deregistration Delay
Amazon ELB https termination results in 504 for large file uploadsAWS ASG With Application LB and Connection DrainingStore request body of route without hitting web server in AWSNginx container health-check for AWS-ALBWhether AWS ALB can route to different URLs within the same instance (not container based)?AWS Application Load Balancer (ALB) in single azALB Connection Draining is always reaching the “Deregistration Delay”AWS Autoscaling Group won't honor five minute draining policy of the Target Group when scaling downHTTP/2 for ALB with EKS on AWSAWS system failing on HEAD request but hardly on GET requests on stress test
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I have three instances configured as targets in an ALB. Connection draining is disabled (deregistration delay set to 0 seconds). Sticky sessions are enabled for 5 minutes.
I get stuck to one web server and start a long running (45s) request to it. I immediately remove the server from the target group. After 45 seconds, the request completes.
Two questions:
Is it normal for an in-flight request to an instance to complete if connection draining is disabled?
If so, how is that any different than using connection draining?
After testing this extensively, it appears that the target deregisters about 12 seconds after I complete the steps to remove it from the target group. But this still leaves about 30 seconds during which the ALB should forcibly terminate the connection to the instance.
amazon-ec2 amazon-web-services amazon-elb amazon-alb
asked Nov 21 '17 at 17:24
BenBen
3881821
add a comment |
I have three instances configured as targets in an ALB. Connection draining is disabled (deregistration delay set to 0 seconds). Sticky sessions are enabled for 5 minutes.
I get stuck to one web server and start a long running (45s) request to it. I immediately remove the server from the target group. After 45 seconds, the request completes.
Two questions:
Is it normal for an in-flight request to an instance to complete if connection draining is disabled?
If so, how is that any different than using connection draining?
After testing this extensively, it appears that the target deregisters about 12 seconds after I complete the steps to remove it from the target group. But this still leaves about 30 seconds during which the ALB should forcibly terminate the connection to the instance.
amazon-ec2 amazon-web-services amazon-elb amazon-alb
asked Nov 21 '17 at 17:24
BenBen
3881821
New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06
add a comment |
I have three instances configured as targets in an ALB. Connection draining is disabled (deregistration delay set to 0 seconds). Sticky sessions are enabled for 5 minutes.
I get stuck to one web server and start a long running (45s) request to it. I immediately remove the server from the target group. After 45 seconds, the request completes.
Two questions:
Is it normal for an in-flight request to an instance to complete if connection draining is disabled?
If so, how is that any different than using connection draining?
After testing this extensively, it appears that the target deregisters about 12 seconds after I complete the steps to remove it from the target group. But this still leaves about 30 seconds during which the ALB should forcibly terminate the connection to the instance.
amazon-ec2 amazon-web-services amazon-elb amazon-alb
asked Nov 21 '17 at 17:24
BenBen
3881821
I have three instances configured as targets in an ALB. Connection draining is disabled (deregistration delay set to 0 seconds). Sticky sessions are enabled for 5 minutes.
I get stuck to one web server and start a long running (45s) request to it. I immediately remove the server from the target group. After 45 seconds, the request completes.
Two questions:
Is it normal for an in-flight request to an instance to complete if connection draining is disabled?
If so, how is that any different than using connection draining?
After testing this extensively, it appears that the target deregisters about 12 seconds after I complete the steps to remove it from the target group. But this still leaves about 30 seconds during which the ALB should forcibly terminate the connection to the instance.
amazon-ec2 amazon-web-services amazon-elb amazon-alb
amazon-ec2 amazon-web-services amazon-elb amazon-alb
asked Nov 21 '17 at 17:24
BenBen
3881821
asked Nov 21 '17 at 17:24
BenBen
3881821
asked Nov 21 '17 at 17:24
BenBen
3881821
asked Nov 21 '17 at 17:24
BenBen
3881821
asked Nov 21 '17 at 17:24
BenBen
3881821
3881821
New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06
add a comment |
New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06
New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06
add a comment |
1 Answer
1
active
oldest
votes
Yes, your open connections should complete because the backend instance is still functioning and the traffic has already been directed to it(sticky). Terminate this instance and things will change dramatically.
The Load balancer will cease delivering traffic for new sessions to the now removed instance, but until all the existing sessions expire (5 min) those that are supposed to be sticky will remain so.
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, your open connections should complete because the backend instance is still functioning and the traffic has already been directed to it(sticky). Terminate this instance and things will change dramatically.
The Load balancer will cease delivering traffic for new sessions to the now removed instance, but until all the existing sessions expire (5 min) those that are supposed to be sticky will remain so.
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
add a comment |
Yes, your open connections should complete because the backend instance is still functioning and the traffic has already been directed to it(sticky). Terminate this instance and things will change dramatically.
The Load balancer will cease delivering traffic for new sessions to the now removed instance, but until all the existing sessions expire (5 min) those that are supposed to be sticky will remain so.
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
add a comment |
Yes, your open connections should complete because the backend instance is still functioning and the traffic has already been directed to it(sticky). Terminate this instance and things will change dramatically.
The Load balancer will cease delivering traffic for new sessions to the now removed instance, but until all the existing sessions expire (5 min) those that are supposed to be sticky will remain so.
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
Yes, your open connections should complete because the backend instance is still functioning and the traffic has already been directed to it(sticky). Terminate this instance and things will change dramatically.
The Load balancer will cease delivering traffic for new sessions to the now removed instance, but until all the existing sessions expire (5 min) those that are supposed to be sticky will remain so.
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
answered Nov 26 '17 at 22:42
Paul FarryPaul Farry
17611
17611
add a comment |
add a comment |
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New requests that are opened after you started the drain are they directed to other nodes?
– Paul Farry
Nov 24 '17 at 8:39
Yes, new requests get directed to other nodes
– Ben
Nov 24 '17 at 19:06