创建k8s User Account
使用openssl方法创建普通用户
准备工作
mkdir /root/pki/ 将k8s ca.pem ca-key.pem 证书拷贝到此目录 cp /opt/kubernetes/ssl/ca-key.pem /root/pki/ cp /opt/kubernetes/ssl/ca.pem /root/pki/
一、创建证书
1.创建user私钥
(umask 077;openssl genrsa -out dev.key 2048)
2.创建证书签署请求
O=组织信息，CN=用户名
openssl req -new -key dev.key -out dev.csr -subj "/O=k8s/CN=dev"
3.签署证书
openssl x509 -req -in dev.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out dev.crt -days 365 Signature ok subject=/O=k8s/CN=dev
二、创建配置文件
kubectl config set-cluster --kubeconfig=/PATH/TO/SOMEFILE #集群配置 kubectl config set-credentials NAME --kubeconfig=/PATH/TO/SOMEFILE #用户配置 kubectl config set-context #context配置 kubectl config use-context #切换context
* --embed-certs=true的作用是不在配置文件中显示证书信息。 * --kubeconfig=/root/dev.conf用于创建新的配置文件，如果不加此选项,则内容会添加到家目录下.kube/config文件中，可以使用use-context来切换不同的用户管理k8s集群。 * context简单的理解就是用什么用户来管理哪个集群，即用户和集群的结合。
创建集群配置
kubectl config set-cluster k8s --server=https://192.168.124.61:6443 --certificate-authority=ca.pem --embed-certs=true --kubeconfig=/root/dev.conf
创建用户配置
kubectl config set-credentials dev --client-certificate=dev.crt --client-key=dev.key --embed-certs=true --kubeconfig=/root/dev.conf
创建context配置
kubectl config set-context dev@k8s --cluster=k8s --user=dev --kubeconfig=/root/dev.conf
切换context
kubectl config use-context dev@k8s --kubeconfig=/root/dev.conf kubectl config view --kubeconfig=/root/dev.conf
创建系统用户
useradd dev mkdir -p /home/dev/.kube cp /root/dev.conf /home/dev/.kube/config chown dev.dev -R /home/dev/ su - dev
k8s验证文件
kubectl get pod
这个时候不成功是因为没有进行权限绑定
创建Role
root@k8s-master:~# cat > pods-reader.yaml <<EOF apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: name: pods-reader rules: - apiGroups: - "" resources: - pods verbs: - get - list - watch EOF
创建Rolebinding
用户dev和role pods-reader的绑定
root@k8s-master:~# cat >test-pods-reader.yaml <<EOF apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: cbmljs-pods-reader roleRef: apiGroup: rbac.authorization.k8s.io kind: Role name: pods-reader subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: dev EOF
到这一步就可以进行验证了
kubectl get pod
我们是可以查看查看default命名空间的pod，但是其他空间的pod是无法查看的。
创建ClusterRole
root@k8s-master:~# cat cluster-reader.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: cluster-reader rules: - apiGroups: - "" resources: - pods verbs: - get - list - watch
创建ClusterRoleBinding
root@k8s-master:~# cat cbmljs-read-all-pod.yaml apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: billy-read-all-pods roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-reader subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: dev
验证结果
kubectl get pod --all-namespaces
就可以看到所有命名空间的pod了.
权限绑定指定的namespace
也可以使用下面方法进行绑定
kubectl get clusterrole 查看系统自带角色
kubectl create rolebinding devuser-admin-rolebinding（rolebinding的名字） --clusterrole=admin（clusterrole的名字，admin在k8s所有namespace下都有最高权限） --user=devuser（将admin的权限赋予devuser用户） --namespace=dev（范围是dev这个namespace下） 即dev
扩展:
kubectl api-resources 可以查看apiGroups
示例：
创建集群角色
cat clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: test-clusterrole
rules:
- apiGroups: [""]
resources: ["pods"]
verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
- apiGroups: ["extensions", "apps"]
resources: ["deployments"]
verbs: ["get", "watch", "list"]
- apiGroups: [""]
resources: ["pods/exec"]
verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
- apiGroups: [""]
resources: ["pods/log"]
verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
- apiGroups: [""]
resources: ["namespaces","namespaces/status"]
verbs: ["*"] # 也可以使用['*']
- apiGroups: ["","apps","extensions","apiextensions.k8s.io"]
resources: ["role","replicasets","deployments","customresourcedefinitions","configmaps"]
verbs: ["*"]
集群绑定
[root@master role]# cat test-classbind.yaml apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: test-all-pods roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: test-clusterrole subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: test
参考：
https://blog.csdn.net/cbmljs/article/details/102953428