K8S request和limit

[TOC]

# 背景
近期dev环境资源比较紧张，需要开发deployment配置做下改变

# request和limit
Requests: 就是需求限制，也叫软限制
Limits：最大限制，也叫硬限制
通常来说：Limits >= Requests
并且requests 和 limits 通常要一起配置，若只配置了requests，而不配置limits，则很可能导致Pod会吃掉所有资源。

# 配置修改
## 命令行修改
```
kubectl set resources deployment test --limits=cpu=50m,memory=64Mi -n test
```
## 从文件修改
```
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: test
  name: test
  namespace: test
spec:
  minReadySeconds: 10
  progressDeadlineSeconds: 600
  replicas: 1    # 如无特殊需求，尽量做1副本
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: test
      version: v1
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: test
        version: v1
      namespace: test
    spec:
      containers:
      - args:
        - nohup ./test -conf /test/config/config.json
        command:
        - /bin/sh
        - -c
        env:
        - name: JAEGER_AGENT_HOST
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: status.hostIP
        image: reg.sanger.cc/test/xxx:v1
        imagePullPolicy: Always
        lifecycle:
          preStop:
            exec:
              command:
              - /bin/sleep
              - "20"
        name: test
        resources:
          limits:     # 自己设定最大的限制
            cpu: 200m
            memory: 256Mi
          requests:   # 修改为0
            cpu: 0
            memory: 0
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /data/logs
          name: logs
        - mountPath: /test/config
          name: config
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 60
      volumes:
      - hostPath:
          path: /data/logs
          type: ""
        name: logs
      - configMap:
          defaultMode: 420
          name: test-config
        name: config
```

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