k8s部署InfluxDB

（作者：陈玓玏）

1. 拉取镜像

docker pull influxdb #拉取镜像
docker run -d influxdb:latest #后台运行容器
docker exec -it 89b /bin/bash #进入容器，89b是容器ID的前三位
cd /usr/bin #进入容器后，进入此文件夹
influxd print-config > /home/default.conf #将influxdb的默认配置导出到文件
exit #退出容器
docker cp 89b:/home/default.conf /home/influxdb/default.conf #将容器内的配置文件cp到主机路径

2. 创建configmap

根据配置文件创建configmap

kubectl create configmap influxdb-config --from-file default.conf

3. 创建pv和pvc

apiVersion: v1
kind: PersistentVolume
metadata:
  labels:
    type: local
    app: influxdb
  name: influxdb-pv
spec:
  storageClassName: influxdb-sc
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 20Gi
  hostPath:
    path: "/home/influxdb/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: influxdb-pvc
spec:
  storageClassName: influxdb-sc
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 20Gi

创建deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: influxdb-dp
  name: influxdb-dp
spec:
  replicas: 1
  selector:
    matchLabels:
      app: influxdb
  template:
    metadata:
      labels:
        app: influxdb
    spec:
      containers:
      - name: influxdb
        image: influxdb:latest
        imagePullPolicy: IfNotPresent
        ports:
          - containerPort: 8086
        volumeMounts:
        - name: influxdb-data
          mountPath: /var/lib/influxdb
          subPath: influxdb
        - name: influxdb-config
          mountPath: /etc/influxdb
      volumes:
      - name: influxdb-data
        persistentVolumeClaim:
          claimName: influxdb-pvc
      - name: influxdb-config
        configMap:
          name: influxdb-config

BUG记录：
pv和pvc都创建成功，但dp显示no such file or directory，说明读取不到主机路径，修改了rancher的配置，加入了/home目录，就可以了。主机看到的和实际pv挂载的路径不一致，实际默认根目录是/data.

创建service

apiVersion: v1
kind: Service
metadata:
  name: influxdb-svc
spec:
  type: NodePort
  ports:
    - port: 8086
      targetPort: 8086
      name: influxdb
  selector:
    app: influxdb