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Implement a periodic watcher for public-ip changes #1823

Closed
Tracked by #52
sridhargaddam opened this issue May 9, 2022 · 1 comment · Fixed by #1824
Closed
Tracked by #52

Implement a periodic watcher for public-ip changes #1823

sridhargaddam opened this issue May 9, 2022 · 1 comment · Fixed by #1824
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enhancement New feature or request

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@sridhargaddam
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There could be some scenarios where the public-ip associated with the Gateway node would change (fe., when the user modifies the external-ip or when using Load-balancer service with AWS Clusters). Submariner should have a periodic watcher which monitors any changes to the public-ip and updates the local endpoint accordingly.
@sridhargaddam sridhargaddam added the enhancement New feature or request label May 9, 2022
@sridhargaddam
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For example, when using the Loadbalancer mode with an AWS Cluster the following is observed.

[sgaddam@localhost submariner-operator]$ ping af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com
PING af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com (3.134.138.231) 56(84) bytes of data.
^C
--- af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

// Sleep for about 2 mins

[sgaddam@localhost submariner-operator]$ ping af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com
PING af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com (3.137.56.223) 56(84) bytes of data.
^C
--- af8840d5f343c4669b2972dd7d1b3da3-96f8b10c1bc2be9c.elb.us-east-2.amazonaws.com ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

You can ignore the non-response to the ping packets and just look at the IP that is resolved for the corresponding hostname. As you can see it changes.

sridhargaddam added a commit to sridhargaddam/submariner that referenced this issue May 9, 2022
@sridhargaddam
Periodic Public IP watcher for Submariner Gateway
19e1202 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: submariner-io#1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
This was referenced May 9, 2022
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sridhargaddam added a commit to sridhargaddam/submariner that referenced this issue May 18, 2022
@sridhargaddam
Periodic Public IP watcher for Submariner Gateway
9d9cb04 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: submariner-io#1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
sridhargaddam added a commit to sridhargaddam/submariner that referenced this issue May 18, 2022
@sridhargaddam
Periodic Public IP watcher for Submariner Gateway
639ae61 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: submariner-io#1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
sridhargaddam added a commit to sridhargaddam/submariner that referenced this issue May 19, 2022
@sridhargaddam
Periodic Public IP watcher for Submariner Gateway
30d7e78 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: submariner-io#1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
tpantelis pushed a commit that referenced this issue May 19, 2022
@sridhargaddam @tpantelis
Periodic Public IP watcher for Submariner Gateway
a56af66 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: #1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
novad03 pushed a commit to novad03/k8s-submariner that referenced this issue Nov 25, 2023
@sridhargaddam @novad03
Periodic Public IP watcher for Submariner Gateway
3010e43 
Currently when the submariner gateway pod comes up, it discovers
the public-ip associated with the gateway node and configures it
in the local endpoint. However, if the public-ip changes, the
connectivity would be lost. This PR implements a periodic watcher
which monitors for any changes to the public IP and updates the
local endpoint when necessary. It works for all the modes like
when using a dedicated gateway node with external-ip as well as
when using a Load-balancer mode of Submariner.

Fixes: submariner-io/submariner#1823
Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
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Periodic Public IP watcher for Submariner Gateway sridhargaddam/submariner
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