环境信息

1. Kubernetes：v1.20.6
2. StorageClass：csi-udisk-rssd
3. Helm：v3.5.2
4. nginx-ingress: 0.47.0

本安装前准备工作

1. 申请域名证书

可以使用 https://keymanager.org/ 来申请 Let’s Encrypt 提供的免费泛域名证书

2. 创建域名证书 secret

kubectl create ns loki
kubectl create secret tls tls-loki-secret \
    --cert=domain.crt \
    --key=domain.key \
    -n loki

3. 同步海外源镜像

在国内环境部署应用，经常因为获取国外源站容器镜像超时，导致部署失败，可以提前将容器镜像同步到本地镜像仓库中，以自有镜像仓库uhub.service.ucloud.cn/ucloud_pts 为例，login仓库，执行命令： docker login uhub.service.ucloud.cn/ucloud_pts
需要同步镜像列表如下：

grafana/loki:2.2.1
nginxinc/nginx-unprivileged:1.19-alpine

关于docker pull tag push 操作可以参考：

• https://docs.docker.com/engine/reference/commandline/pull/
• https://docs.docker.com/engine/reference/commandline/tag/
• https://docs.docker.com/engine/reference/commandline/push/

4. 创建 imagePullSecrets

创建容器集群访问仓库地址 uhub.service.ucloud.cn/ucloud_pts，拉取镜像需要的 secret

kubectl create namespace loki
kubectl create secret docker-registry registry-loki-secret \
        --namespace=loki \
        --docker-server=uhub.service.ucloud.cn/ucloud_pts \
        --docker-username='xxxxxx' \
        --docker-password='xxxxxx'

4. 添加 Helm仓库

这里选用prometheus-community提供的chart仓库

helm repo add grafana https://grafana.github.io/helm-charts
helm repo update

5. 定义配置，完成部署

cat > loki-values.yaml << EOF
global:
  image:
    registry: harbor.onwalk.net/pts
  clusterDomain: "admin.local"
imagePullSecrets:
  - name: harbor-secret
gateway:
  enabled: true
  replicas: 3
  ingress:
    enabled: true
    ingressClassName: nginx
    hosts:
      - host: loki-gateway.onwalk.net
        paths:
          - path: /
            pathType: Prefix
    tls:
      - secretName: tls-loki-gateway-secret
        hosts:
          - loki-gateway.onwalk.net
ingester:
  replicas: 3
  persistence:
    enabled: true
    size: 100Gi
    storageClass: csi-udisk-rssd
distributor:
  replicas: 3
querier:
  replicas: 3
  persistence:
    enabled: true
    size: 100Gi
    storageClass: csi-udisk-rssd
EOF

helm upgrade --install loki grafana/loki-distributed -n loki -f loki-values.yaml

参考

https://github.com/CloudXiaobai/loki-cluster-deploy/tree/master/production/loki-system