adds CONN_LIMIT to the WeaveNetworkingSpec

Weave limits the number of connections between peers and the default is 30.
As described here: ce9c5162bd/site/kubernetes/kube-addon.md
Setting the CONN_LIMIT environment variable controls this setting. Adding a field in the
WeaveNetworkingSpec and adding the env var to the associated templates lets users
have clusters larger than 30 nodes and still use weave's peer discovery

The weave authors have indicated that 100 is not an unreasonable setting.
https://github.com/weaveworks/weave/issues/1621#issuecomment-152713060

pkg/apis/kops/networking.go

@@ -57,7 +57,8 @@ type KopeioNetworkingSpec struct {
 
 // WeaveNetworkingSpec declares that we want Weave networking
 type WeaveNetworkingSpec struct {
-	MTU *int32 `json:"mtu,omitempty"`
+	MTU       *int32 `json:"mtu,omitempty"`
+	ConnLimit *int32 `json:"connLimit,omitempty"`
 }
 
 // FlannelNetworkingSpec declares that we want Flannel networking

pkg/apis/kops/v1alpha1/networking.go

@@ -57,7 +57,8 @@ type KopeioNetworkingSpec struct {
 
 // WeaveNetworkingSpec declares that we want Weave networking
 type WeaveNetworkingSpec struct {
-	MTU *int32 `json:"mtu,omitempty"`
+	MTU       *int32 `json:"mtu,omitempty"`
+	ConnLimit *int32 `json:"connLimit,omitempty"`
 }
 
 // FlannelNetworkingSpec declares that we want Flannel networking

pkg/apis/kops/v1alpha2/networking.go

@@ -57,7 +57,8 @@ type KopeioNetworkingSpec struct {
 
 // WeaveNetworkingSpec declares that we want Weave networking
 type WeaveNetworkingSpec struct {
-	MTU *int32 `json:"mtu,omitempty"`
+	MTU       *int32 `json:"mtu,omitempty"`
+	ConnLimit *int32 `json:"connLimit,omitempty"`
 }
 
 // FlannelNetworkingSpec declares that we want Flannel networking

upup/models/cloudup/resources/addons/networking.weave/k8s-1.6.yaml.template

@@ -123,6 +123,10 @@ spec:
             - name: WEAVE_MTU
               value: "{{ .Networking.Weave.MTU }}"
             {{- end }}
+            {{- if .Networking.Weave.ConnLimit }}
+            - name: CONN_LIMIT
+              value: "{{ .Networking.Weave.ConnLimit }}"
+            {{- end }}
           image: 'weaveworks/weave-kube:2.1.3'
           livenessProbe:
             httpGet:

upup/models/cloudup/resources/addons/networking.weave/k8s-1.7.yaml.template

@@ -131,6 +131,10 @@ spec:
             - name: WEAVE_MTU
               value: "{{ .Networking.Weave.MTU }}"
             {{- end }}
+            {{- if .Networking.Weave.ConnLimit }}
+            - name: CONN_LIMIT
+              value: "{{ .Networking.Weave.ConnLimit }}"
+            {{- end }}
           image: 'weaveworks/weave-kube:2.1.3'
           livenessProbe:
             httpGet:

upup/models/cloudup/resources/addons/networking.weave/pre-k8s-1.6.yaml.template

@@ -42,6 +42,10 @@ spec:
             - name: WEAVE_MTU
               value: "{{ .Networking.Weave.MTU }}"
             {{- end }}
+            {{- if .Networking.Weave.ConnLimit }}
+            - name: CONN_LIMIT
+              value: "{{ .Networking.Weave.ConnLimit }}"
+            {{- end }}
           image: 'weaveworks/weave-kube:2.1.3'
           livenessProbe:
             httpGet:

upup/pkg/fi/cloudup/bootstrapchannelbuilder.go

@@ -388,8 +388,8 @@ func (b *BootstrapChannelBuilder) buildManifest() (*channelsapi.Addons, map[stri
 
 	if b.cluster.Spec.Networking.Weave != nil {
 		key := "networking.weave"
-		// 2.1.3-kops.1 = 2.1.3, kops packaging version 1.
+		// 2.1.3-kops.2 = 2.1.3, kops packaging version 2.
-		version := "2.1.3-kops.1"
+		version := "2.1.3-kops.2"
 
 		{
 			location := key + "/pre-k8s-1.6.yaml"

upup/pkg/fi/cloudup/tests/bootstrapchannelbuilder/weave/manifest.yaml

@@ -69,18 +69,18 @@ spec:
     name: networking.weave
     selector:
       role.kubernetes.io/networking: "1"
-    version: 2.1.3-kops.1
+    version: 2.1.3-kops.2
   - id: k8s-1.6
     kubernetesVersion: '>=1.6.0 <1.7.0'
     manifest: networking.weave/k8s-1.6.yaml
     name: networking.weave
     selector:
       role.kubernetes.io/networking: "1"
-    version: 2.1.3-kops.1
+    version: 2.1.3-kops.2
   - id: k8s-1.7
     kubernetesVersion: '>=1.7.0'
     manifest: networking.weave/k8s-1.7.yaml
     name: networking.weave
     selector:
       role.kubernetes.io/networking: "1"
-    version: 2.1.3-kops.1
+    version: 2.1.3-kops.2