实战：基于Loki采集K8s日志

[root@master ~]# wget https://get.helm.sh/helm-v3.9.0-linux-amd64.tar.gz
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[root@master ~]# tar -xf helm-v3.9.0-linux-amd64.tar.gz   #解压
[root@master ~]# cd linux-amd64/
[root@master linux-amd64]# ls
helm  LICENSE  README.md
[root@master linux-amd64]# mv helm /usr/bin/
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[root@master linux-amd64]# vim /etc/profile   #编辑该文件
source <(helm completion bash)    #文档最后写入该命令
[root@master linux-amd64]# source /etc/profile    #使其生效
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[root@master ~]# helm version   #查看版本
version.BuildInfo{Version:"v3.9.0", GitCommit:"7ceeda6c585217a19a1131663d8cd1f7d641b2a7", GitTreeState:"clean", GoVersion:"go1.17.5"}
[root@master ~]# helm repo list   #查看仓库
Error: no repositories to show        #还没有添加仓库
[root@master ~]# helm env   #查看helm的配置信息
HELM_BIN="helm"
HELM_CACHE_HOME="/root/.cache/helm"
HELM_CONFIG_HOME="/root/.config/helm"
HELM_DATA_HOME="/root/.local/share/helm"
HELM_DEBUG="false"
HELM_KUBEAPISERVER=""
HELM_KUBEASGROUPS=""
HELM_KUBEASUSER=""
HELM_KUBECAFILE=""
HELM_KUBECONTEXT=""
HELM_KUBETOKEN=""
HELM_MAX_HISTORY="10"
HELM_NAMESPACE="default"
HELM_PLUGINS="/root/.local/share/helm/plugins"
HELM_REGISTRY_CONFIG="/root/.config/helm/registry/config.json"
HELM_REPOSITORY_CACHE="/root/.cache/helm/repository"
HELM_REPOSITORY_CONFIG="/root/.config/helm/repositories.yaml"
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[root@master ~]# helm repo add grafana https://grafana.github.io/helm-charts    #添加仓库
"grafana" has been added to your repositories
[root@master ~]# 
[root@master ~]# 
[root@master ~]# helm repo list   #查看仓库
NAME    URL                                  
grafana https://grafana.github.io/helm-charts
[root@master ~]# helm search repo | grep loki   #在仓库中搜索可用的helm的charts
grafana/loki                         5.36.3        2.9.2             Helm chart for Grafana Loki in simple, scalable...
grafana/loki-canary                  0.14.0        2.9.1             Helm chart for Grafana Loki Canary                
grafana/loki-distributed             0.76.1        2.9.2             Helm chart for Grafana Loki in microservices mode 
grafana/loki-simple-scalable         1.8.11        2.6.1             Helm chart for Grafana Loki in simple, scalable...
grafana/loki-stack                   2.9.11        v2.6.1            Loki: like Prometheus, but for logs.    #下载最后一个堆栈类型，包含了各日志工具
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[root@master ~]# helm pull grafana/loki-stack   #下载
[root@master ~]# ls
anaconda-ks.cfg  calico.yaml  helm-v3.9.0-linux-amd64.tar.gz  linux-amd64  loki-stack-2.9.11.tgz
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[root@master ~]# tar -xf loki-stack-2.9.11.tgz   #解压
[root@master ~]# cd loki-stack
[root@master loki-stack]# ls   #可以看到，解压后目录下会有多个资源文件
charts  Chart.yaml  README.md  requirements.lock  requirements.yaml  templates  values.yaml
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[root@master loki-stack]# vim values.yaml
36 grafana:
 37   enabled: true            #由false修改为true，启用grafana
 38   sidecar:
 39     datasources:
 40       label: ""
 41       labelValue: ""
 42       enabled: true
 43       maxLines: 1000
 44   image:
 45     tag: 8.3.5
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[root@master loki-stack]# kubectl create ns loki
namespace/loki created
[root@master loki-stack]# helm install loki -n loki .  #安装，这里最后有个点，为引用当前目录下的资源
NAME: loki
LAST DEPLOYED: Sat Nov 18 14:43:20 2023
NAMESPACE: loki
STATUS: deployed
REVISION: 1
NOTES:
The Loki stack has been deployed to your cluster. Loki can now be added as a datasource in Grafana.

See http://docs.grafana.org/features/datasources/loki/ for more detail.
[root@master loki-stack]# kubectl -n loki get pods   #查看pod资源
NAME                           READY   STATUS    RESTARTS   AGE
loki-0                         1/1     Running   0          8m43s
loki-grafana-6b5f7dc79-rjcwm   2/2     Running   0          8m43s
loki-promtail-t69rd            1/1     Running   0          8m43s
loki-promtail-tckwm            1/1     Running   0          8m43s
[root@master loki-stack]# 
[root@master loki-stack]# 
[root@master loki-stack]# 
[root@master loki-stack]# kubectl -n loki get deploy   #查看控制器
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
loki-grafana   1/1     1            1           8m49s
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[root@master loki-stack]# kubectl -n loki edit svc loki-grafana
service/loki-grafana edited    #修改类型为nodeport
[root@master loki-stack]# kubectl -n loki get svc  #查看暴露的端口
NAME              TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
loki              ClusterIP   10.96.209.225   <none>        3100/TCP       14m
loki-grafana      NodePort    10.96.164.26    <none>        80:31276/TCP   14m
loki-headless     ClusterIP   None            <none>        3100/TCP       14m
loki-memberlist   ClusterIP   None            <none>        7946/TCP       14m
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[root@master loki-stack]# kubectl get secret -n loki loki-grafana -o jsnotallow="{.data.admin-password}" | base64 --decode ; echo
hdHI2C0vBAWdE6dw8Mbx7j846JZSsCUXbmUXLx4g   #获取到的密码
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