This will cut down on the amount of time it takes to delete an external
load balancer, which should reduce the likelihood of resource leaks when
clusters are deleted.
This code was in rough shape, so I've fixed the issues with the original
PR as well as a few other changes:
1. Clarify the error messages related to the "gce Addresses" to make it
clear we're talking about static IP addresses
2. Fix the bug in the original PR, which was a nil pointer dereference
from passing op to waitForRegionOp when the address doesn't exist.
3. Rearrange the steps of EnsureTCPLoadBalancerDeleted to be the reverse
of EnsureCreated, which mostly just seems like good practice to me.
This is also supported by the following two bugs I found :(
4. Fix an independent bug of returning too early if the target pool
doesn't exist, effectively stranding the firewall. This was likely
introduced because target pools used to be the last thing deleted,
so it was previously safe to return there.
5. Fix an independent bug of not returning an error waiting for the
target pool to be deleted failed. This was very possibly causing
target pool leaks in our e2e tests. This was similarly due to
assuming that the target pool was the last thing deleted in the
function, then having the firewall deletion stuck in after it.
Only takes the first available subnet in a AZ, ignore other subnets
and log warning about this.
Removes AWS region comparison for subnet AZs. A VPC is only in a single
AWS region.
Fixes#12381
This code was in rough shape, so I've fixed the issues with the original
PR as well as a few other changes:
1. Clarify the error messages related to the "gce Addresses" to make it
clear we're talking about static IP addresses
2. Fix the bug in the original PR, which was a nil pointer dereference
from passing op to waitForRegionOp when the address doesn't exist.
3. Rearrange the steps of EnsureTCPLoadBalancerDeleted to be the reverse
of EnsureCreated, which mostly just seems like good practice to me.
This is also supported by the following two bugs I found :(
4. Fix an independent bug of returning too early if the target pool
doesn't exist, effectively stranding the firewall. This was likely
introduced because target pools used to be the last thing deleted,
so it was previously safe to return there.
5. Fix an independent bug of not returning an error waiting for the
target pool to be deleted failed. This was very possibly causing
target pool leaks in our e2e tests. This was similarly due to
assuming that the target pool was the last thing deleted in the
function, then having the firewall deletion stuck in after it.
The ELB client lookup isn't necessary because the service
does not operate across regions. Instead the client should
be built like the others by querying for the region from
the master node's metadata service.
A lot of packages use StringSet, but they don't use anything else from
the util package. Moving StringSet into another package will shrink
their dependency trees significantly.
Avoid creating a new 'err' variable in the 'if'-branch, shadowing the one
in the outer scope.
Any error from subsequent 'cloud, err = GetCloudProvider()' was not propagated
to 'err' variable in the outer scope and thus errors were never returned from
this function.
This is hard to debug error on OpenStack, when content of --cloud-config=
file is wrong or connection to OpenStack fails. Such error is never logged
and Kubernetes thinks everything is OK.
Prashanth Balasubramanian