Add REUSE_CERT to skip creaing new ca/cert files

hack/local-up-cluster.sh

@@ -231,6 +231,9 @@ ROOT_CA_FILE=${CERT_DIR}/server-ca.crt
 ROOT_CA_KEY=${CERT_DIR}/server-ca.key
 CLUSTER_SIGNING_CERT_FILE=${CLUSTER_SIGNING_CERT_FILE:-"${ROOT_CA_FILE}"}
 CLUSTER_SIGNING_KEY_FILE=${CLUSTER_SIGNING_KEY_FILE:-"${ROOT_CA_KEY}"}
+# Reuse certs will skip generate new ca/cert files under CERT_DIR
+# it's useful with PRESERVE_ETCD=true because new ca will make existed service account secrets invalided
+REUSE_CERTS=${REUSE_CERTS:-"false"}
 
 # name of the cgroup driver, i.e. cgroupfs or systemd
 if [[ ${CONTAINER_RUNTIME} == "docker" ]]; then
@@ -449,6 +452,39 @@ function set_service_accounts {
     fi
 }
 
+function generate_certs {
+    # Create CA signers
+    if [[ "${ENABLE_SINGLE_CA_SIGNER:-}" = true ]]; then
+        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" server '"client auth","server auth"'
+        sudo cp "${CERT_DIR}/server-ca.key" "${CERT_DIR}/client-ca.key"
+        sudo cp "${CERT_DIR}/server-ca.crt" "${CERT_DIR}/client-ca.crt"
+        sudo cp "${CERT_DIR}/server-ca-config.json" "${CERT_DIR}/client-ca-config.json"
+    else
+        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" server '"server auth"'
+        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" client '"client auth"'
+    fi
+
+    # Create auth proxy client ca
+    kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" request-header '"client auth"'
+
+    # serving cert for kube-apiserver
+    kube::util::create_serving_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "server-ca" kube-apiserver kubernetes.default kubernetes.default.svc "localhost" ${API_HOST_IP} ${API_HOST} ${FIRST_SERVICE_CLUSTER_IP}
+
+    # Create client certs signed with client-ca, given id, given CN and a number of groups
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kubelet system:node:${HOSTNAME_OVERRIDE} system:nodes
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kube-proxy system:kube-proxy system:nodes
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' controller system:kube-controller-manager
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' scheduler  system:kube-scheduler
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' admin system:admin system:masters
+
+    # Create matching certificates for kube-aggregator
+    kube::util::create_serving_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "server-ca" kube-aggregator api.kube-public.svc "localhost" ${API_HOST_IP}
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" request-header-ca auth-proxy system:auth-proxy
+    # TODO remove masters and add rolebinding
+    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kube-aggregator system:kube-aggregator system:masters
+    kube::util::write_client_kubeconfig "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "${ROOT_CA_FILE}" "${API_HOST}" "${API_SECURE_PORT}" kube-aggregator
+}
+
 function start_apiserver {
     security_admission=""
     if [[ -n "${DENY_SECURITY_CONTEXT_ADMISSION}" ]]; then
@@ -514,37 +550,11 @@ function start_apiserver {
         node_port_range="--service-node-port-range=${NODE_PORT_RANGE}"
     fi
 
-    # Create CA signers
-    if [[ "${ENABLE_SINGLE_CA_SIGNER:-}" = true ]]; then
-        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" server '"client auth","server auth"'
-        sudo cp "${CERT_DIR}/server-ca.key" "${CERT_DIR}/client-ca.key"
-        sudo cp "${CERT_DIR}/server-ca.crt" "${CERT_DIR}/client-ca.crt"
-        sudo cp "${CERT_DIR}/server-ca-config.json" "${CERT_DIR}/client-ca-config.json"
-    else
-        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" server '"server auth"'
-        kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" client '"client auth"'
+    if [[ "${REUSE_CERTS}" == "false" ]]; then
+      # Create Certs
+      generate_certs
     fi
 
-    # Create auth proxy client ca
-    kube::util::create_signing_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" request-header '"client auth"'
-
-    # serving cert for kube-apiserver
-    kube::util::create_serving_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "server-ca" kube-apiserver kubernetes.default kubernetes.default.svc "localhost" ${API_HOST_IP} ${API_HOST} ${FIRST_SERVICE_CLUSTER_IP}
-
-    # Create client certs signed with client-ca, given id, given CN and a number of groups
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kubelet system:node:${HOSTNAME_OVERRIDE} system:nodes
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kube-proxy system:kube-proxy system:nodes
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' controller system:kube-controller-manager
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' scheduler  system:kube-scheduler
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' admin system:admin system:masters
-
-    # Create matching certificates for kube-aggregator
-    kube::util::create_serving_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "server-ca" kube-aggregator api.kube-public.svc "localhost" ${API_HOST_IP}
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" request-header-ca auth-proxy system:auth-proxy
-    # TODO remove masters and add rolebinding
-    kube::util::create_client_certkey "${CONTROLPLANE_SUDO}" "${CERT_DIR}" 'client-ca' kube-aggregator system:kube-aggregator system:masters
-    kube::util::write_client_kubeconfig "${CONTROLPLANE_SUDO}" "${CERT_DIR}" "${ROOT_CA_FILE}" "${API_HOST}" "${API_SECURE_PORT}" kube-aggregator
-
     cloud_config_arg="--cloud-provider=${CLOUD_PROVIDER} --cloud-config=${CLOUD_CONFIG}"
     if [[ "${EXTERNAL_CLOUD_PROVIDER:-}" == "true" ]]; then
       cloud_config_arg="--cloud-provider=external"