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Ubernetes Lite: Volumes can dictate zone scheduling

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For AWS EBS, a volume can only be attached to a node in the same AZ.
The scheduler must therefore detect if a volume is being attached to a
pod, and ensure that the pod is scheduled on a node in the same AZ as
the volume.

So that the scheduler need not query the cloud provider every time, and
to support decoupled operation (e.g. bare metal) we tag the volume with
our placement labels.  This is done automatically by means of an
admission controller on AWS when a PersistentVolume is created backed by
an EBS volume.

Support for tagging GCE PVs will follow.

Pods that specify a volume directly (i.e. without using a
PersistentVolumeClaim) will not currently be scheduled correctly (i.e.
they will be scheduled without zone-awareness).
This commit is contained in:
Justin Santa Barbara
2015-11-29 14:00:49 -05:00
parent 7743a4ca89
commit f9a6ac077e
15 changed files with 536 additions and 4 deletions
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2
cluster/aws/config-default.sh
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@@ -126,7 +126,7 @@ if [[ "${ENABLE_NODE_AUTOSCALER}" == "true" ]]; then
fi
# Admission Controllers to invoke prior to persisting objects in cluster
ADMISSION_CONTROL=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota
ADMISSION_CONTROL=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,PersistentVolumeLabel
# Optional: Enable/disable public IP assignment for minions.
# Important Note: disable only if you have setup a NAT instance for internet access and configured appropriate routes!

2
cluster/aws/config-test.sh
View File

@@ -122,7 +122,7 @@ if [[ "${ENABLE_NODE_AUTOSCALER}" == "true" ]]; then
fi
# Admission Controllers to invoke prior to persisting objects in cluster
ADMISSION_CONTROL=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota
ADMISSION_CONTROL=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,PersistentVolumeLabel
# Optional: Enable/disable public IP assignment for minions.
# Important Note: disable only if you have setup a NAT instance for internet access and configured appropriate routes!