Kubernetes Loki安装部署并收集日志

 loki 官方推荐的最佳实践为采用 DamonSet部署 promtail 的方式，将 node 的 /var/lib/pods目录挂载进容器内部，借助prometheus 的服务发现机制动态的为日志加上标签，无论是资源的占用程度还是部署维护难度都是非常低。这也是主流的云原生日志采集范式。

Loki收集k8s架构图：

 采用 helm 方法部署  创建名称空间

kubectl create namespace monitoring

安装Loki  注意：

不做持久化：将 persistence.enabled=true 改为 persistence.enabled=false 即可
时间本地化
service.httpNodePort 指定http端口
service.grpcNodePort 指定grpc端口
serviceMonitor.enabled 让普罗米修斯监控到指标
--set serviceMonitor.labels="prometheus-operated"
k8s版本低无法安装修改版本：kubeVersion: 1.10.0-0
--set ingress.enabled=ture 获取ingress指标

添加仓库：

helm repo add kube-ops https://charts.kube-ops.io
helm repo update

部署 Loki

helm install loki -n monitoring 
--set replicas=1 
--set promtail.enabled=true 
--set service.type=ClusterIP 
--set persistence.enabled=false 
--set extraVolumeMounts[0].name=localtime 
--set extraVolumeMounts[0].mountPath="/etc/localtime" 
--set extraVolumes[0].name=localtime 
--set extraVolumes[0].hostPath.path="/etc/localtime" 
kube-ops/loki --version 1.6.1

查看pod状态 

[root@master ~]# kubectl get pod -n monitoring  
NAME                  READY   STATUS    RESTARTS   AGE
loki-0                1/1     Running   1          12h
loki-promtail-99ztv   1/1     Running   0          3m20s
loki-promtail-nb2q4   1/1     Running   0          4m50s
loki-promtail-pzxcl   1/1     Running   0          2m34s

配置Loki为数据源：确认Loki服务端口:  Loki服务端口号是80

[root@master ~]# kubectl get svc -n monitoring
NAME            TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)           AGE
loki            ClusterIP   10.233.2.239           80/TCP,9095/TCP   12h

 可以看到日志来了

 Logging Dashboard via Loki dashboard for Grafana | Grafana Labs

 解决Panel plugin not found: grafana-piechart-panel

[root@master ~]# kubectl exec -it grafana-757fcd5f7c-lkxrx -n ops
error: you must specify at least one command for the container
[root@master ~]# kubectl exec -it grafana-757fcd5f7c-lkxrx -n ops bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
bash-5.0$ grafana-cli plugins install grafana-piechart-panel
installing grafana-piechart-panel @ 1.6.2
from: https://grafana.com/api/plugins/grafana-piechart-panel/versions/1.6.2/download
into: /var/lib/grafana/plugins

?.Installed grafana-piechart-panel successfully 

Restart grafana after installing plugins . 

bash-5.0$ service grafana-server restart
bash: service: command not found
bash-5.0$ exit
exit
command terminated with exit code 127
[root@master ~]# kubectl delete pod  grafana-757fcd5f7c-lkxrx -n ops
pod "grafana-757fcd5f7c-lkxrx" deleted

最后你要查看日志可以用上面导入的面板，也可以使用之前的源查看