k8s部署elk收集应用日志信息

/ 2018-04-30 22:45:06 / 0评 / 0

实战步骤简介

一、部署ELK

 

1. ssh登录到可以执行kubectl命令的机器上去;

2. 创建elk的部署脚本elkhost.yaml,内容如下:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: elkhost
spec:
  replicas: 1
  template:
    metadata:
     labels:
       name: elkhost
    spec:
     containers:
     - name: elkhost
       image: sebp/elk:622
       tty: true
       ports: [{
          "containerPort": 5601
        },{
          "containerPort": 5044
        }]

如上所示,暴露了两个端口:kibana的5601和logstash的5044;

3. 在elkhost.yaml所在目录执行命令kubectl create -f elkhost.yaml,即可创建elk对应的pod,如下:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl get pods

NAME                       READY     STATUS    RESTARTS   AGE
elkhost-54c9bbd8d5-ffq68   1/1       Running   0          3m

4. 将kibana的5601端口以NodePort的方式对外暴露,这样外部就可以通过节点IP地址来访问kibana服务了,创建部署脚本elkkibana-svc.yaml,kibana的服务通过node节点的30001端口对外暴露,内容如下:

apiVersion: v1
kind: Service
metadata:
  name: elkkibana
spec:
  type: NodePort
  ports:
       - port: 5601
         nodePort: 30001
  selector:
    name: elkhost

5. 将logstash的5044端口以ClusterIP的方式对外暴露,这样其他pod的filebeat就可以通过服务名加5044端口来访问logstash服务了,创建部署脚本elkhost-svc.yaml,logstash的服务通过5044端口对K8S内部的pod暴露,内容如下:

apiVersion: v1
kind: Service
metadata:
  name: elkhost
spec:
  type: ClusterIP
  ports:
       - port: 5044
         targetPort: 5044
  selector:
    name: elkhost

6. 在elkhost-svc.yaml所在目录执行命令kubectl create -f elkhost-svc.yaml && kubectl create -f elkkibana-svc.yaml,即可创建elkhost和elkkibana这两个服务,如下:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl create -f elkhost-svc.yaml && kubectl create -f elkkibana-svc.yaml
service "elkhost" created
service "elkkibana" created

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl get service

NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
elkhost      ClusterIP   10.43.103.244   <none>        5044/TCP         9s
elkkibana    NodePort    10.43.219.137   <none>        5601:30001/TCP   9s
kubernetes   ClusterIP   10.43.0.1       <none>        443/TCP          16d

7. 执行命令查看elkhost的pod部署在K8S的哪个node节点上:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl describe pod elk
Name:           elkhost-54c9bbd8d5-ffq68
Namespace:      default
Node:           willzhao-vostro-3267/192.168.31.89
Start Time:     Mon, 30 Apr 2018 16:22:04 +0800
Labels:         name=elkhost
                pod-template-hash=1075668481
Annotations:    kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"default","name":"elkhost-54c9bbd8d5","uid":"9096cde8-4c4f-11e8-a776-024f8a041a1a"...
Status:         Running

...

如上所示,Node: willzhao-vostro-3267/192.168.31.89显示了这个pod部署的节点IP是192.168.31.89;

8. 打开浏览器,输入192.168.31.89:30001,即可访问到Kibana服务,如下图:

二、部署Web应用

1. 创建elkwebdemo的部署脚本elkwebdemo.yaml,内容如下:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: elkwebdemo
spec:
  replicas: 1
  template:
    metadata:
     labels:
       name: elkwebdemo
    spec:
     containers:
     - name: elkwebdemo
       image: bolingcavalry/elkdemo:0.0.1-SNAPSHOT
       tty: true
       ports:
       - containerPort: 8080

2. 在elkwebdemo.yaml所在目录执行命令kubectl create -f elkwebdemo.yaml,即可创建elk对应的pod,如下:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl get pod

NAME                         READY     STATUS    RESTARTS   AGE
elkhost-944bcbcd4-8vpbs      1/1       Running   0          4m
elkwebdemo-dddbcfc6f-x4pk6   1/1       Running   0          9s

3. 创建elk对外服务的部署脚本elkwebdemo-svc.yaml,web的服务通过node节点的30002端口对外暴露,内容如下:

apiVersion: v1
kind: Service
metadata:
  name: elkwebdemo
spec:
  type: NodePort
  ports:
       - port: 8080
         nodePort: 30002 
  selector:
    name: elkwebdemo

5. 在elkwebdemo-svc.yaml所在目录执行命令kubectl create -f elkwebdemo-svc.yaml,即可创建elkwebdemo对应的pod,如下:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl get service

NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
elkhost      ClusterIP   10.43.103.244   <none>        5044/TCP         6m
elkkibana    NodePort    10.43.219.137   <none>        5601:30001/TCP   6m
kubernetes   ClusterIP   10.43.0.1       <none>        443/TCP          16d

6. 执行命令查看elkwebdemo的pod部署在K8S的哪个node节点上:

root@willzhao-Vostro-3267:/usr/local/work/elkk8s# kubectl describe pod elkwebdemo
Name:           elkwebdemo-dddbcfc6f-8bbrb
Namespace:      default
Node:           willzhao-vostro-3267/192.168.31.89
Start Time:     Mon, 30 Apr 2018 16:28:37 +0800
Labels:         name=elkwebdemo
                pod-template-hash=888679729
Annotations:    kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"default","name":"elkwebdemo-dddbcfc6f","uid":"7a9364d1-4c50-11e8-a776-024f8a041a1...
Status:         Running
...

如上所示,Node: willzhao-vostro-3267/192.168.31.89显示了这个pod部署的节点IP是192.168.31.89;

7. 打开浏览器,输入http://192.168.31.89:30002/hello/tom,即可访问到web服务,如下图:

三、配置kibana

再次打开kibana页面,如下图所示,点击红框中的“Discover”,发现已经搜集到了上报的日志,如绿框所示:

如下图设置:创建索引名称

 

继续设置,如下图: 设置时间格式

再此点击左上角的”Discover”,既可开始搜索web应用日志,如下图:

四、Web应用扩容

现在我们模拟生产环境的在线扩容:

1. 将web应用从一个扩展到三个,执行以下命令:

kubectl scale deployment elkwebdemo --replicas=3

2. 可以看到web应用对应的pod已经扩展了,如下所示:

root@willzhao-Vostro-3267:~# kubectl scale deployment elkwebdemo --replicas=3
deployment "elkwebdemo" scaled

root@willzhao-Vostro-3267:~# kubectl get pod

NAME                         READY     STATUS    RESTARTS   AGE
elkhost-944bcbcd4-8vpbs      1/1       Running   0          1h
elkwebdemo-dddbcfc6f-crzcp   1/1       Running   0          11s
elkwebdemo-dddbcfc6f-tsppk   1/1       Running   0          11s
elkwebdemo-dddbcfc6f-x4pk6   1/1       Running   0          1h

3. 为了能多上报一些日志,在浏览器上多刷新几次这个地址:http://192.168.31.89:30002/hello/tom

4. 回到kibana页面,如下图,点击红框中的“host”,展开的信息显示,这些日志来自三个host:

 

 

 

 

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