Use flux namespace in deploy/ examples

This is so that the configuration is not effected by e.g. a namespace
context set in the `kubectl` config of the user, as this caused
problems during the creation of the `ClusterRoleBinding` which was set
to the `default` namespace, while the resources themselves would be
created in the user their configured namespace.

It also simplifies the 'Get started with Kustomize' guide, as a user
does no longer need to create the namespace as a prerequisite but is
still able to overwrite it by adding a `namespace: <targetNamespace>`
to their `kustomization.yaml`.

deploy/flux-account.yaml

@@ -7,6 +7,7 @@ metadata:
   labels:
     name: flux
   name: flux
+  namespace: flux
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: ClusterRole
@@ -34,4 +35,4 @@ roleRef:
 subjects:
   - kind: ServiceAccount
     name: flux
-    namespace: default
+    namespace: flux

deploy/flux-deployment.yaml

@@ -3,6 +3,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: flux
+  namespace: flux
 spec:
   replicas: 1
   selector:

deploy/flux-ns.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: flux

deploy/flux-secret.yaml

@@ -3,4 +3,5 @@ apiVersion: v1
 kind: Secret
 metadata:
   name: flux-git-deploy
+  namespace: flux
 type: Opaque

deploy/kustomization.yaml

@@ -1,4 +1,5 @@
 resources:
+  - flux-ns.yaml
   - memcache-svc.yaml
   - memcache-dep.yaml
   - flux-account.yaml

deploy/memcache-dep.yaml

@@ -5,6 +5,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: memcached
+  namespace: flux
 spec:
   replicas: 1
   selector:

deploy/memcache-svc.yaml

@@ -3,6 +3,7 @@ apiVersion: v1
 kind: Service
 metadata:
   name: memcached
+  namespace: flux
 spec:
   ports:
     - name: memcached

docs/tutorials/get-started-kustomize.md

@@ -24,28 +24,14 @@ First you'll need a git repository to store your cluster desired state.
 In our example we are going to use [`fluxcd/flux-get-started`](https://github.com/fluxcd/flux-get-started).
 If you want to use that too, be sure to create a fork of it on GitHub.
 
-Create a directory and add the `flux` namespace definition to it:
-
-```sh
-mkdir fluxcd
-
-cat > fluxcd/namespace.yaml <<EOF
-apiVersion: v1
-kind: Namespace
-metadata:
-  name: flux
-EOF
-```
-
-Create a kustomization file and use the Flux deploy YAMLs as base:
+Create a directory, and add a `kustomization.yaml` file that uses the
+Flux deploy YAMLs as a base:
 
 ```sh
 cat > fluxcd/kustomization.yaml <<EOF
 namespace: flux
-resources:
-  - namespace.yaml
 bases:
- - github.com/fluxcd/flux//deploy
+  - github.com/fluxcd/flux//deploy
 patchesStrategicMerge:
   - patch.yaml
 EOF
@@ -88,6 +74,49 @@ We set `--git-path=namespaces,workloads` to exclude Helm manifests.
 If you want to get started with Helm, please refer to the
 ["Get started with Flux using Helm"](get-started-helm.md) tutorial.
 
+### Overwriting the default namespace
+
+Overwriting the default (`flux`) namespace is possible by defining
+your own namespace resource and a patch to remove the default from
+the base.
+
+Create your own namespace definition:
+
+```sh
+cat > fluxcd/namespace.yaml <<EOF
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: <namespace>
+EOF
+```
+
+Create a patch to remove the default namespace from the base:
+
+```sh
+cat > fluxcd/patch-default-ns.yaml <<EOF
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: flux
+$patch: delete
+EOF
+```
+
+Adapt your `fluxcd/kustomization.yaml` to include the patch, and
+change the namespace:
+
+```yaml
+namespace: <namespace>
+resources:
+  - namespace.yaml
+bases:
+  - github.com/fluxcd/flux//deploy
+patchesStrategicMerge:
+  - patch-default-ns.yaml
+  - patch.yaml
+```
+
 ## Install Flux with Kustomize
 
 In the next step, deploy Flux to the cluster (you'll need kubectl **1.14** or newer):

pkg/install/generate.go

@@ -40,6 +40,7 @@ func main() {
 		params := install.TemplateParameters{
 			GitURL:    "[email protected]:fluxcd/flux-get-started",
 			GitBranch: "master",
+			Namespace: "flux",
 		}
 		manifests, err := install.FillInTemplates(params)
 		if err != nil {