skipper: enable manual canary deployment

requires dict function zalando-incubator/cluster-lifecycle-manager#711

Signed-off-by: Alexander Yastrebov <[email protected]>

cluster/config-defaults.yaml

@@ -70,6 +70,9 @@ skipper_ingress_min_replicas: "2"
 {{end}}
 skipper_ingress_cpu: "1000m"
 skipper_ingress_memory: "1500Mi"
+
+skipper_ingress_canary_internal_version: ""
+
 # When set to true (and dedicated node pool for skipper is also true) the
 # daemonset overhead will be subtracted from the cpu settings such
 # that skipper will perfectly fit on the node.

cluster/manifests/deletions.yaml

@@ -59,6 +59,12 @@ post_apply:
   kind: ClusterRoleBinding
 {{- end }}
 
+{{ if not .Cluster.ConfigItems.skipper_ingress_canary_internal_version }}
+- name: skipper-ingress-canary
+  namespace: kube-system
+  kind: Deployment
+{{ end }}
+
 {{ if eq .Cluster.ConfigItems.skipper_routesrv_enabled "false" }}
 - name: skipper-ingress-routesrv
   namespace: kube-system

cluster/manifests/skipper/deployment.yaml

@@ -1,27 +1,44 @@
 {{ $internal_version := "v0.18.42-691" }}
-{{ $version := index (split $internal_version "-") 0 }}
 
+{{ template "skipper-ingress" dict
+  "name" "skipper-ingress"
+  "internal_version" $internal_version
+}}
+
+{{ if .ConfigItems.skipper_ingress_canary_internal_version }}
+{{ template "skipper-ingress" dict
+  "name" "skipper-ingress-canary"
+  "internal_version" .ConfigItems.skipper_ingress_canary_internal_version
+  "replicas" 1
+{{ end }}
+
+{{ define "skipper-ingress" }}
+---
+{{ $version := index (split .internal_version "-") 0 }}
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: skipper-ingress
+  name: "{{ .name }}"
   namespace: kube-system
   labels:
     application: skipper-ingress
     version: {{ $version }}
     component: ingress
 spec:
+{{ if index . "replicas" }}
+  replicas: {{ .replicas }}
+{{ end }}
   strategy:
     rollingUpdate:
       maxSurge: 1
       maxUnavailable: 0
   selector:
     matchLabels:
-      deployment: skipper-ingress
+      deployment: "{{ .name }}"
   template:
     metadata:
       labels:
-        deployment: skipper-ingress
+        deployment: "{{ .name }}"
         application: skipper-ingress
         version: {{ $version }}
         component: ingress
@@ -397,6 +414,7 @@ spec:
         key: dedicated
         value: skipper-ingress
 {{ end }}
+{{ end }}
 
 {{ if ne .ConfigItems.skipper_routesrv_enabled "false" }}
 ---