前面已经完成了k8s集群环境的搭建部署，也实现了创建pod，service等服务，本文开始介绍如何在k8s集群中部署应用。这里以zabbix监控为例。

部署MySQL

zabbix监控需要使用MySQL来存储数据
1.创建MySQL的部署文件
创建pv和pvc（用来将MySQL数据做持久化）

[root@server1 zabbix]# vim mysql_pv.yml

kind: PersistentVolume
apiVersion: v1
metadata:
  name: mysql-pv
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

创建MySQL配置文件

[root@server1 zabbix]# vim mysql-conf.yml

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-conf
data:
  custom.cnf: |
    [mysqld]
    default_storage_engine=innodb
    skip_external_locking
    skip_host_cache
    skip_name_resolve
    default_authentication_plugin=mysql_native_password

创建MySQL密码文件

[root@server1 zabbix]# echo -n password|base64
cGFzc3dvcmQ=

[root@server1 zabbix]# vim mysql_pwd.yml

apiVersion: v1
kind: Secret
metadata:
  name: mysql-pwd
data:
  mysql-root-pwd: redhat

创建MySQL部署文件

[root@server1 zabbix]# vim mysql_deploy.yml

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  type: NodePort
  ports:
  - port: 3306
    nodePort: 30306
    protocol: TCP
    targetPort: 3306
  selector:
    app: mysql

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql
        name: mysql
        imagePullPolicy: Always
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pwd
              key: mysql-root-pwd
         ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-conf
          mountPath: /etc/mysql/conf.d/
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
        - name: timezone
          mountPath: /etc/localtime
      volumes:
      - name: mysql-conf
        configMap:
          name: mysql-conf
      - name: timezone
        hostPath:
          path: /usr/share/zoneinfo/Asia/Shanghai
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pvc

创建MySQL

[root@server1 zabbix]# kubectl apply -f mysql_deploy.yml 
service/mysql created
deployment.apps/mysql created
[root@server1 zabbix]# kubectl apply -f mysql-conf.yml 
configmap/mysql-conf created
[root@server1 zabbix]# kubectl apply -f mysql_pv.yml 
persistentvolume/mysql-pv created
persistentvolumeclaim/mysql-pvc created
[root@server1 zabbix]# kubectl apply -f mysql_pwd.yml 
secret/mysql-pwd created

部署zabbix

创建zabbix-server yml文件

[root@server1 zabbix]# vim zabbix-server.yml

apiVersion: v1
kind: Service
metadata:
  name: zabbix-server
spec:
  type: NodePort
  ports:
  - port:  10051
    nodePort: 30051
    protocol: TCP
    targetPort: 10051
  selector:
    app: zabbix-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zabbix-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zabbix-server
  template:
    metadata:
      labels:
        app: zabbix-server
    spec:
      containers:
        - name: zabbix-server
          image: zabbix/zabbix-server-mysql
          imagePullPolicy: Always
          ports:
          - containerPort: 10051
            name: server
            protocol: TCP
          readinessProbe:
            tcpSocket:
              port: server
            initialDelaySeconds: 5
            periodSeconds: 10
          livenessProbe:
            tcpSocket:
              port: server
            initialDelaySeconds: 15
            periodSeconds: 20
          env:
          - name: DB_SERVER_HOST
            value: "mysql"
          - name: MYSQL_USER
            value: "zabbix"
          - name: MYSQL_PASSWORD
            value: "zabbix"
          - name: MYSQL_DATABASE
            value: "zabbix"
          - name: ZBX_CACHESIZE
            value: "1024M"
          - name: ZBX_TRENDCACHESIZE
            value: "1024M"
          - name: ZBX_HISTORYCACHESIZE
            value: "2048M"
          - name: ZBX_HISTORYINDEXCACHESIZE
            value: "1024M"
          - name: ZBX_STARTTRAPPERS
            value: "5"
          - name: ZBX_STARTPREPROCESSORS
            value: "10"
          - name: ZBX_STARTDBSYNCERS
            value: "10"
          - name: DB_SERVER_PORT
            value: "3306"
        - name: zabbix-agent
          image: zabbix/zabbix-agent
          imagePullPolicy: Always
          ports:
          - containerPort: 10050
            name: zabbix-agent
          env:
          - name: ZBX_HOSTNAME
            value: "Zabbix server"
          - name: ZBX_SERVER_HOST
            value: "127.0.0.1"
          - name: ZBX_PASSIVE_ALLOW
            value: "true"
          - name: ZBX_STARTAGENTS
            value: "3"
          - name: ZBX_TIMEOUT
            value: "10"
          securityContext:
            privileged: true

执行yml文件

[root@server1 zabbix]# kubectl apply -f zabbix-server.yml 
service/zabbix-server created
deployment.apps/zabbix-server created

部署zabbix-web

[root@server1 zabbix]# vim zabbix-web.yml

apiVersion: v1
kind: Service
metadata:
  name: zabbix-web
spec:
  type: NodePort
  ports:
  - port: 80
    protocol: TCP
    nodePort: 30080
    targetPort: 80
  selector:
    app: zabbix-web
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zabbix-web
spec:
  replicas: 2
  selector:
    matchLabels:
      app: zabbix-web
  template:
    metadata:
      labels:
        app: zabbix-web
    spec:
      containers:
      - image: zabbix/zabbix-web-nginx-mysql
        name: zabbix-web
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          name: web
          protocol: TCP
        env:
        - name: DB_SERVER_HOST
          value: "mysql"
        - name:  ZBX_SERVER_HOST
          value: "zabbixserver"
        - name: MYSQL_USER
          value: "zabbix"
        - name: MYSQL_PASSWORD
          value: "zabbix"
        - name: TZ
          value: "Asia/Shanghai"

执行yml文件

[root@server1 zabbix]# kubectl apply -f zabbix-web.yml 
service/zabbix-web created
deployment.apps/zabbix-web created

查看刚才部署的MySQL和zabbix服务状态

[root@server1 zabbix]# kubectl get deploy,pod,svc,cm,secret,pv,pvc -o wide

NAME                            READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS                   IMAGES                                           SELECTOR
deployment.apps/mysql           0/1     1            0           149m    mysql                        mysql                                            app=mysql
deployment.apps/zabbix-server   0/1     1            0           8m40s   zabbix-server,zabbix-agent   zabbix/zabbix-server-mysql,zabbix/zabbix-agent   app=zabbix-server
deployment.apps/zabbix-web      0/2     2            0           119s    zabbix-web                   zabbix/zabbix-web-nginx-mysql                    app=zabbix-web

NAME                                 READY   STATUS                       RESTARTS   AGE     IP            NODE                  NOMINATED NODE   READINESS GATES
pod/mysql-8f559dd4c-jm94m            0/1     CreateContainerConfigError   0          149m    10.244.2.8    server3.example.com   <none>           <none>
pod/nginx-cdk6m                      1/1     Running                      0          21h     10.244.1.26   server2.example.com   <none>           <none>
pod/nginx-pxmwd                      1/1     Running                      0          31d     10.244.1.25   server2.example.com   <none>           <none>
pod/zabbix-server-7c694c486f-2px5q   1/2     Running                      2          8m39s   10.244.2.9    server3.example.com   <none>           <none>
pod/zabbix-web-7567556f55-66cd6      0/1     ContainerCreating            0          116s    <none>        server3.example.com   <none>           <none>
pod/zabbix-web-7567556f55-wvgsk      0/1     ContainerCreating            0          117s    <none>        server2.example.com   <none>           <none>

NAME                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)           AGE     SELECTOR
service/kubernetes      ClusterIP   10.96.0.1        <none>        443/TCP           48d     <none>
service/mysql           NodePort    10.97.72.188     <none>        3306:30306/TCP    149m    app=mysql
service/nginx-service   NodePort    10.101.191.0     <none>        80:30001/TCP      31d     app=nginx
service/zabbix-server   NodePort    10.105.154.150   <none>        10051:30051/TCP   8m42s   app=zabbix-server
service/zabbix-web      NodePort    10.104.132.246   <none>        80:30080/TCP      2m      app=zabbix-web

NAME                   DATA   AGE
configmap/mysql-conf   1      143m

NAME                         TYPE                                  DATA   AGE
secret/default-token-8vnct   kubernetes.io/service-account-token   3      48d
secret/mysql-pwd             Opaque                                1      136m

NAME                        CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM               STORAGECLASS   REASON   AGE    VOLUMEMODE
persistentvolume/mysql-pv   1Gi        RWO            Retain           Bound    default/mysql-pvc   manual                  142m   Filesystem

NAME                              STATUS   VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE    VOLUMEMODE
persistentvolumeclaim/mysql-pvc   Bound    mysql-pv   1Gi        RWO            manual         142m   Filesystem

通过访问IP+nodeport来测试，可以看到zabbix已经部署成功。