09-5.部署 EFK 插件

EFK 对应的目录：kubernetes/cluster/addons/fluentd-elasticsearch

$ cd /opt/k8s/kubernetes/cluster/addons/fluentd-elasticsearch
$ ls *.yaml
es-service.yaml  es-statefulset.yaml  fluentd-es-configmap.yaml  fluentd-es-ds.yaml  kibana-deployment.yaml  kibana-service.yaml

修改定义文件

$ cp es-statefulset.yaml{,.orig}
$ diff es-statefulset.yaml{,.orig}
76c76
<       - image: longtds/elasticsearch:v5.6.4
---
>       - image: k8s.gcr.io/elasticsearch:v5.6.4

$ cp fluentd-es-ds.yaml{,.orig}
$ diff fluentd-es-ds.yaml{,.orig}
79c79
<         image: netonline/fluentd-elasticsearch:v2.0.4
---
>         image: k8s.gcr.io/fluentd-elasticsearch:v2.0.4

给 Node 设置标签

DaemonSet fluentd-es 只会调度到设置了标签 beta.kubernetes.io/fluentd-ds-ready=true 的 Node，需要在期望运行 fluentd 的 Node 上设置该标签；

$ kubectl get nodes
NAME         STATUS    ROLES     AGE       VERSION
kube-node1   Ready     <none>    3d        v1.10.4
kube-node2   Ready     <none>    3d        v1.10.4
kube-node3   Ready     <none>    3d        v1.10.4

$ kubectl label nodes kube-node3 beta.kubernetes.io/fluentd-ds-ready=true
node "kube-node3" labeled

执行定义文件

$ pwd
/opt/k8s/kubernetes/cluster/addons/fluentd-elasticsearch
$ ls *.yaml
es-service.yaml  es-statefulset.yaml  fluentd-es-configmap.yaml  fluentd-es-ds.yaml  kibana-deployment.yaml  kibana-service.yaml
$ kubectl create -f .

检查执行结果

$ kubectl get pods -n kube-system -o wide|grep -E 'elasticsearch|fluentd|kibana'
elasticsearch-logging-0                  1/1       Running   0          5m        172.30.81.7   kube-node1
elasticsearch-logging-1                  1/1       Running   0          2m        172.30.39.8   kube-node3
fluentd-es-v2.0.4-hntfp                  1/1       Running   0          5m        172.30.39.6   kube-node3
kibana-logging-7445dc9757-pvpcv          1/1       Running   0          5m        172.30.39.7   kube-node3

$ kubectl get service  -n kube-system|grep -E 'elasticsearch|kibana'
elasticsearch-logging   ClusterIP   10.254.50.198    <none>        9200/TCP        5m
kibana-logging          ClusterIP   10.254.255.190   <none>        5601/TCP        5m

kibana Pod 第一次启动时会用较长时间(0-20分钟)来优化和 Cache 状态页面，可以 tailf 该 Pod 的日志观察进度：

[k8s@kube-node1 fluentd-elasticsearch]$ kubectl logs kibana-logging-7445dc9757-pvpcv -n kube-system -f
{"type":"log","@timestamp":"2018-06-16T11:36:18Z","tags":["info","optimize"],"pid":1,"message":"Optimizing and caching bundles for graph, ml, kibana, stateSessionStorageRedirect, timelion and status_page. This may take a few minutes"}
{"type":"log","@timestamp":"2018-06-16T11:40:03Z","tags":["info","optimize"],"pid":1,"message":"Optimization of bundles for graph, ml, kibana, stateSessionStorageRedirect, timelion and status_page complete in 224.57 seconds"}

注意：只有当的 Kibana pod 启动完成后，才能查看 kibana dashboard，否则会提示 refuse。

访问 kibana

通过 kube-apiserver 访问：

 $ kubectl cluster-info|grep -E 'Elasticsearch|Kibana'
 Elasticsearch is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/elasticsearch-logging/proxy
 Kibana is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/kibana-logging/proxy

浏览器访问 URL： https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/kibana-logging/proxy
对于 virtuabox 做了端口映射： https://127.0.0.1:8080/api/v1/namespaces/kube-system/services/kibana-logging/proxy

通过 kubectl proxy 访问：

创建代理
```
 $ kubectl proxy --address='172.27.129.105' --port=8086 --accept-hosts='^*$'
 Starting to serve on 172.27.129.80:8086
```
浏览器访问 URL：https://172.27.129.105:8086/api/v1/namespaces/kube-system/services/kibana-logging/proxy
对于 virtuabox 做了端口映射： https://127.0.0.1:8086/api/v1/namespaces/kube-system/services/kibana-logging/proxy

在 Settings -> Indices 页面创建一个 index（相当于 mysql 中的一个 database），选中 Index contains time-based events，使用默认的 logstash-* pattern，点击 Create ;

screenshot

创建 Index 后，稍等几分钟就可以在 Discover 菜单下看到 ElasticSearch logging 中汇聚的日志；