loki

2024-04-05 13:20| 来源: 网络整理| 查看: 265

版本：grafana/promtail:v0.4.0

Promtail 默认安装，会抓取所有pod的日志，如果我不想从群集中的所有Pod抓取日志，而仅抓取所选应用程序的Pod日志，需要自己修改的配置。

例如：我们想跟prometheus一样，增加 annotations: prometheus.io/scrape: "true" 来选定抓取的pod：

$ cat nginx-deployment.yaml apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx spec: replicas: 1 template: metadata: labels: app: nginx annotations: prometheus.io/scrape: "true" spec: nodeSelector: kubernetes.io/hostname: 10.2.2.123 containers: - name: nginx image: nginx:latest ports: - containerPort: 80

在promtail.yaml的scrape_config下增加：

- action: keep regex: true source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]

完整的promtail配置文件如下：

# cat /etc/promtail/promtail.yaml client: backoff_config: maxbackoff: 5s maxretries: 20 minbackoff: 100ms batchsize: 102400 batchwait: 1s external_labels: {} timeout: 10s positions: filename: /run/promtail/positions.yaml server: http_listen_port: 3101 target_config: sync_period: 10s scrape_configs: - job_name: kubernetes-pods-app pipeline_stages: - docker: {} kubernetes_sd_configs: - role: pod relabel_configs: - action: keep regex: true source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape] - action: drop regex: .+ source_labels: - __meta_kubernetes_pod_label_name - source_labels: - __meta_kubernetes_pod_label_app target_label: __service__ - source_labels: - __meta_kubernetes_pod_node_name target_label: __host__ - action: drop regex: '' source_labels: - __service__ - action: labelmap regex: __meta_kubernetes_pod_label_(.+) - action: replace replacement: $1 separator: / source_labels: - __meta_kubernetes_namespace - __service__ target_label: job - action: replace source_labels: - __meta_kubernetes_namespace target_label: namespace - action: replace source_labels: - __meta_kubernetes_pod_name target_label: instance - action: replace source_labels: - __meta_kubernetes_pod_container_name target_label: container_name - replacement: /var/log/pods/*$1/*.log separator: / source_labels: - __meta_kubernetes_pod_uid - __meta_kubernetes_pod_container_name target_label: __path__

参考：

https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md#relabel_config

https://github.com/grafana/loki/issues/808

https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_confighttps://prometheus.io/docs/prometheus/latest/configuration/configuration/#kubernetes_sd_config

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