Merge pull request karmada-io#1735 from lonelyCZ/pr-undeploy-agent

Add a script to undeploy karmada agent from a member cluster

hack/undeploy-karmada-agent.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+
+REPO_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+
+function usage() {
+  echo "This script will undeploy karmada agent from a cluster."
+  echo "Usage: hack/undeploy-karmada-agent.sh <KARMADA_APISERVER_KUBECONFIG> <KARMADA_APISERVER_CONTEXT_NAME> <MEMBER_CLUSTER_KUBECONFIG> <MEMBER_CLUSTER_CONTEXT_NAME>"
+  echo "Example: hack/undeploy-karmada-agent.sh ~/.kube/karmada.config karmada-apiserver ~/.kube/members.config member1"
+}
+
+if [[ $# -ne 4 ]]; then
+  usage
+  exit 1
+fi
+
+# check kube config file existence
+if [[ ! -f "${1}" ]]; then
+  echo -e "ERROR: failed to get kubernetes config file: '${1}', not existed.\n"
+  usage
+  exit 1
+fi
+KARMADA_APISERVER_KUBECONFIG=$1
+
+# check context existence
+if ! kubectl config use-context "${2}" --kubeconfig="${KARMADA_APISERVER_KUBECONFIG}" > /dev/null 2>&1;
+then
+  echo -e "ERROR: failed to use context: '${2}' not in ${KARMADA_APISERVER_KUBECONFIG}. \n"
+  usage
+  exit 1
+fi
+KARMADA_APISERVER_CONTEXT_NAME=$2
+
+# check kube config file existence
+if [[ ! -f "${3}" ]]; then
+  echo -e "ERROR: failed to get kubernetes config file: '${3}', not existed.\n"
+  usage
+  exit 1
+fi
+MEMBER_CLUSTER_KUBECONFIG=$3
+
+# check context existence
+if ! kubectl config get-contexts "${4}" --kubeconfig="${MEMBER_CLUSTER_KUBECONFIG}" > /dev/null 2>&1;
+then
+  echo -e "ERROR: failed to get context: '${4}' not in ${MEMBER_CLUSTER_KUBECONFIG}. \n"
+  usage
+  exit 1
+fi
+MEMBER_CLUSTER_NAME=$4
+
+source "${REPO_ROOT}"/hack/util.sh
+
+# remove the member cluster from karmada control plane
+kubectl delete cluster ${MEMBER_CLUSTER_NAME}
+
+# remove agent from the member cluster
+if [ -n "${KUBECONFIG+x}" ];then
+  CURR_KUBECONFIG=$KUBECONFIG # backup current kubeconfig
+fi
+export KUBECONFIG="${MEMBER_CLUSTER_KUBECONFIG}" # switch to member cluster
+kubectl config use-context "${MEMBER_CLUSTER_NAME}"
+
+# remove namespace of karmada agent
+kubectl delete -f "${REPO_ROOT}/artifacts/agent/namespace.yaml"
+kubectl delete namespace karmada-cluster
+
+# remove clusterrole and clusterrolebinding of karmada agent
+kubectl delete -f "${REPO_ROOT}/artifacts/agent/clusterrole.yaml"
+kubectl delete -f "${REPO_ROOT}/artifacts/agent/clusterrolebinding.yaml"
+
+# recover the kubeconfig after removing agent if necessary
+if [ -n "${CURR_KUBECONFIG+x}" ];then
+  export KUBECONFIG="${CURR_KUBECONFIG}"
+else
+  unset KUBECONFIG
+fi