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kube-controller-manager: Add configure-cloud-routes option

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This allows kube-controller-manager to allocate CIDRs to nodes (with
allocate-node-cidrs=true), but will not try to configure them on the
cloud provider, even if the cloud provider supports Routes.

The default is configure-cloud-routes=true, and it will only try to
configure routes if allocate-node-cidrs is also configured, so the
default behaviour is unchanged.

This is useful because on AWS the cloud provider configures routes by
setting up VPC routing table entries, but there is a limit of 50
entries.  So setting configure-cloud-routes on AWS would allow us to
continue to allocate node CIDRs as today, but replace the VPC
route-table mechanism with something not limited to 50 nodes.

We can't just turn off the cloud-provider entirely because it also
controls other things - node discovery, load balancer creation etc.

Fix #25602
This commit is contained in:
Justin Santa Barbara
2016-05-14 09:50:17 -04:00
parent ae28564526
commit b754393630
6 changed files with 18 additions and 9 deletions
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docs/admin/kube-controller-manager.md
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@@ -67,6 +67,7 @@ kube-controller-manager
--concurrent-replicaset-syncs=5: The number of replica sets that are allowed to sync concurrently. Larger number = more responsive replica management, but more CPU (and network) load
--concurrent-resource-quota-syncs=5: The number of resource quotas that are allowed to sync concurrently. Larger number = more responsive quota management, but more CPU (and network) load
--concurrent_rc_syncs=5: The number of replication controllers that are allowed to sync concurrently. Larger number = more responsive replica management, but more CPU (and network) load
--configure-cloud-routes[=true]: Should CIDRs allocated by allocate-node-cidrs be configured on the cloud provider.
--controller-start-interval=0: Interval between starting controller managers.
--daemonset-lookup-cache-size=1024: The the size of lookup cache for daemonsets. Larger number = more responsive daemonsets, but more MEM load.
--deleting-pods-burst=10: Number of nodes on which pods are bursty deleted in case of node failure. For more details look into RateLimiter.