NK-8: Implemented deployment script for free (local) and in-cluster usage of the controller. Added readme file for scripts, improved scripts: implemented more convenient way to pass arguments. Removed hardcode from server.go.

crd/MutatingWebhookConfiguration.yaml

@@ -11,6 +11,7 @@ webhooks:
         name: kube-policy-svc
         namespace: default
         path: "/mutate"
+      caBundle: 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
     rules:
       - operations: [ "CREATE" ]
         resources: [ "*/*" ]

crd/MutatingWebhookConfiguration_local.yaml

@@ -0,0 +1,15 @@
+apiVersion: admissionregistration.k8s.io/v1beta1
+kind: MutatingWebhookConfiguration
+metadata:
+  name: nirmata-kube-policy-webhook-cfg
+  labels:
+    app: kube-policy
+webhooks:
+  - name: webhook.nirmata.kube-policy
+    clientConfig:
+      url: "https://localhost/mutate"
+    rules:
+      - operations: [ "CREATE" ]
+        resources: [ "*/*" ]
+        apiGroups: [ "*" ]
+        apiVersions: [ "*" ]

scripts/README.md

@@ -0,0 +1,25 @@
+Use these scripts to prepare the controller for work.
+All these scripts should be launched from the root folder of the project, for example:
+`scripts/compile-image.sh`
+
+### compile-image.sh ###
+Compiles the project to go executable, generates docker image and pushes it to the repo. Has no arguments.
+
+### generate-server-cert.sh ###
+Generates TLS certificate and key that used by webhook server. Example:
+`scripts/generate-server-cert.sh --service=kube-policy-svc --namespace=my_namespace --serverIp=192.168.10.117`
+* `--service` identifies the service for in-cluster webhook server. Do not specify it if you plan to run webhook server outside the cluster.
+* `--namespace` identifies the namespace for in-cluster webhook server. Default value is "default".
+* `--serverIp` is the IP of master node, it can be found in `~/.kube/config`: clusters.cluster[0].server. **The default is hardcoded value**, so you should explicitly specify it.
+
+### deploy-controller.sh ###
+Prepares controller for current environment in 1 of 2 possible modes: free (local) and in-cluster. Usage:
+`scripts/deploy-controller.sh --namespace=my_namespace --serverIp=192.168.10.117`
+* --namespace identifies the namespace for in-cluster webhook server. Do not specify it if you plan to run webhook server outside the cluster.
+* --serverIp is the IP of master node, means the same as for `generate-server-cert.sh`.
+
+### test-web-hook.sh ###
+Quickly creates and deletes test config map. If your webhook server is running, you should see the corresponding output from it. Use this script after `deploy-controller.sh`.
+
+### update-codegen.sh ###
+Generates additional code for controller object. You should resolve all dependencies before using it, see main Readme for details.

scripts/deploy-controller.sh

@@ -1,29 +1,64 @@
 #!/bin/bash
+
+for i in "$@"
+do
+case $i in
+    --namespace=*)
+    namespace="${i#*=}"
+    shift
+    ;;
+    --serverIp=*)
+    serverIp="${i#*=}"
+    shift
+    ;;
+esac
+done
+
+if [ -z "${serverIp}" ]; then
+  # This is the standard IP of minikube
+  serverIp="192.168.10.117" #TODO: ! Read it from ~/.kube/config !
+fi
+
 hub_user_name="nirmata"
 project_name="kube-policy"
-echo ${1}
-namespace=${1}
-if [ ${namespace} -eq "" ]; then
-  echo "Specify target namespace in the first parameter"
-  exit 1
-fi
 
 service_name="${project_name}-svc"
 echo "Generating certificate for the service ${service_name}..."
-serverIp="192.168.10.177" #TODO: ! Read it from ~/.kube/config !
+
 certsGenerator="./scripts/generate-server-cert.sh"
 chmod +x "${certsGenerator}"
-${certsGenerator} ${service_name} ${namespace} ${serverIp} || exit 2
 
-secret_name="${project_name}-secret"
-echo "Generating secret ${secret_name}..."
-kubectl delete secret "${secret_name}" 2>/dev/null
-kubectl create secret generic ${secret_name} --namespace ${namespace} --from-file=./certs || exit 3
+if [ -z "${namespace}" ]; then # controller is launched locally
 
-echo "Creating the service ${service_name}..."
-kubectl delete -f crd/service.yaml
-kubectl create -f crd/service.yaml || exit 4
+  ${certsGenerator} "--serverIp=${serverIp}" || exit 2
 
-echo "Creating deployment..."
-kubectl delete -f crd/deployment.yaml
-kubectl create -f crd/deployment.yaml || exit 5
+  echo "Applying webhook..."
+  kubectl delete -f crd/MutatingWebhookConfiguration_local.yaml
+  kubectl create -f crd/MutatingWebhookConfiguration_local.yaml || exit 3
+
+  echo -e "\n### You can build and run kube-policy project locally.\n### To check its work, run it with parameters -cert and -key, which contain generated TLS certificate and key (see their paths in log above)."
+
+else # controller is launched within a cluster
+
+  ${certsGenerator} "--service=${service_name}" "--namespace=${namespace}" "--serverIp=${serverIp}" || exit 2
+
+  secret_name="${project_name}-secret"
+  echo "Generating secret ${secret_name}..."
+  kubectl delete secret "${secret_name}" 2>/dev/null
+  kubectl create secret generic ${secret_name} --namespace ${namespace} --from-file=./certs || exit 3
+
+  echo "Creating the service ${service_name}..."
+  kubectl delete -f crd/service.yaml
+  kubectl create -f crd/service.yaml || exit 4
+
+  echo "Creating deployment..."
+  kubectl delete -f crd/deployment.yaml
+  kubectl create -f crd/deployment.yaml || exit 5
+
+  echo "Applying webhook..."
+  kubectl delete -f crd/MutatingWebhookConfiguration.yaml
+  kubectl create -f crd/MutatingWebhookConfiguration.yaml || exit 3
+
+  echo -e "\n### Controller is running in cluster.\n### You can use compile-image.sh to rebuild its image and then the current script to redeploy the controller.\n### Check its work by 'kubectl logs <controller_pod> command'"
+
+fi

scripts/generate-server-cert.sh

@@ -1,7 +1,26 @@
 #!/bin/bash
-service=${1}
-namespace=${2}
-serverIp=${3}
+
+for i in "$@"
+do
+case $i in
+    --service=*)
+    service="${i#*=}"
+    shift
+    ;;
+    --namespace=*)
+    namespace="${i#*=}"
+    shift
+    ;;
+    --serverIp=*)
+    serverIp="${i#*=}"
+    shift
+    ;;
+esac
+done
+
+if [ -z "${namespace}" ]; then
+  namespace="default"
+fi
 
 echo "service is $service"
 echo "namespace is $namespace"
@@ -34,7 +53,15 @@ outKeyFile=${destdir}/server-key.pem
 outCertFile=${destdir}/server.crt
 
 openssl genrsa -out ${outKeyFile} 2048 || exit 2
-openssl req -new -key ${destdir}/server-key.pem -subj "/CN=${service}.${namespace}.svc" -out ${tmpdir}/server.csr -config ${tmpdir}/csr.conf || exit 3
+if [ ! -z "${service}" ]; then
+  subjectCN="${service}.${namespace}.svc"
+  echo "Configuring work WITHIN a cluster with CN=${subjectCN}"
+else
+  subjectCN=${serverIp}
+  echo "Configuring work OUTSIDE a cluster with CN=${subjectCN}"
+fi
+
+openssl req -new -key ${destdir}/server-key.pem -subj "/CN=${subjectCN}" -out ${tmpdir}/server.csr -config ${tmpdir}/csr.conf || exit 3
 
 CSR_NAME=${service}.cert-request
 kubectl delete csr ${CSR_NAME} 2>/dev/null

scripts/test-web-hook.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+# You should see the trace of requests in the output of webhook server
+kubectl create configmap test-config-map --from-literal="some_var=some_value"
+kubectl delete configmap test-config-map

server/server.go

@@ -12,11 +12,13 @@ import (
 
 type WebhookServer struct {
 	server http.Server
+	logger *log.Logger
 }
 
 func (ws *WebhookServer) serve(w http.ResponseWriter, r *http.Request) {
 	fmt.Println("/mutate is called!")
-	httputil.DumpRequest(r, true)
+	dump, _ := httputil.DumpRequest(r, true)
+	ws.logger.Printf("%s", dump)
 }
 
 func (ws *WebhookServer) RunAsync() {
@@ -39,6 +41,7 @@ func (ws *WebhookServer) Stop() {
 
 func NewWebhookServer(certFile string, keyFile string, logger *log.Logger) WebhookServer {
 	var ws WebhookServer
+	ws.logger = logger
 	mux := http.NewServeMux()
 	mux.HandleFunc("/mutate", ws.serve)