03-09 12:09 阅读 95

Kubernetes中的Security Context, Resource requirement和Service Account

K8s中的Security Context上下文

k8s中的Security Context通常用于安全考虑，限制pod对host系统文件权限读取或者限制其对系统资源的使用。默认情况下，如果不使用Security Context，则pod默认会以root用户运行，在pod的从天儿中运行程序时，容易对某些对安全要求较高的系统造成损害。

详情参看官方:

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  securityContext:
    runAsUser: 100
    runAsGroup: 1000
    fsGroup: 205
  containers:
  - image: nginx
    name: nginx
    resources: {}
    volumeMounts:
    - name: host-vol
      mountPath: /etc/local
  dnsPolicy: ClusterFirst
  restartPolicy: Always
  volumes:
  - name: host-vol
    hostPath:
      path: /usr/shared/test
status: {}

K8s中的Resource Requirement

Resource资源定义表明了pod在运行期间，占据host资源的请求与限制使用，通常对resources分为requests与limits。字如其面，对系统资源的请求与最大限制

详情参考官方

两种方式可以在pod创建resources

命令行

kubectl run nginx --image=nginx --ports=80 --restart=Never --requests="cpu=250m,memory=256Mi" --limits="cpu=500m,memory=512Mi"

YAML文本

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 500m
        memory: 512Mi
      requests:
        cpu: 250m
        memory: 256Mi
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

K8s中的Resource Requirement

Service account应用于在pod的容器中运行的进程

详情参看官方：

同样，有命令行和YAMl文件来定义service account

命令行

kubectl create sa nginx

kubectl run nginx --image=nginx --serviceaccount=nginx --ports=80 --restart=Never

YAML文件

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  serviceAccountName: nginx
  containers:
  - image: nginx
    name: nginx
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

原文：https://www.cnblogs.com/kknight/p/14835475.html