Add snap-upgrade.sh

snap-upgrade.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+SNAP_CHANNEL="1.21/stable"
+ALL_SNAPS="kube-apiserver kube-scheduler kube-controller-manager kube-proxy kubectl kubelet cdk-addons"
+MASTER_SNAPS="kube-apiserver kube-scheduler kube-controller-manager kube-proxy kubectl cdk-addons"
+WORKER_SNAPS="kube-proxy kubelet kubectl"
+
+# Download Juju 2.9
+snap download --channel=2.9 juju
+
+# Download latest snaps from designated channel
+for snap in $ALL_SNAPS
+do
+  snap download --channel=$SNAP_CHANNEL $snap
+done
+
+# Attach new snaps to master units
+for snap in $MASTER_SNAPS
+do
+  juju attach kubernetes-master $snap=`ls ${snap}_*.snap`
+done
+
+# Attach new snaps to worker units
+for snap in $WORKER_SNAPS
+do
+  juju attach kubernetes-worker $snap=`ls ${snap}_*.snap`
+done
+
+# Upgrade to new snaps on masters, one at a time
+for unit in `juju status --format json | jq -r '.applications|.["kubernetes-master"].units | keys[]'`
+do
+  juju run-action $unit upgrade --wait
+done
+
+# Upgrade to new snaps on workers, one at a time
+for unit in `juju status --format json | jq -r '.applications|.["kubernetes-worker"].units | keys[]'`
+do
+  juju run-action $unit upgrade --wait
+done