raintank/snap_k8s

raintank/snap_k8s镜像说明

镜像概述

本Docker镜像集成了Snap监控框架及必要插件，旨在提供Kubernetes节点及其容器的性能和可用性指标汇总，支持通过DaemonSet方式在Kubernetes集群中批量部署。

核心功能

• 收集Kubernetes节点的CPU、内存、网络、磁盘IO等系统指标
• 收集容器的资源使用情况指标
• 支持将指标发布至Graphite服务
• 提供与Grafana仪表盘的集成能力

使用场景

• Kubernetes集群的实时性能监控
• 容器资源使用情况跟踪与分析
• 节点健康状态监控与告警基础数据采集

配置说明

1. Graphite配置修改：需调整DaemonSet中ConfigMap的Graphite部分，设置server（Graphite服务器地址）、port（端口）和prefix（指标前缀）。
2. 指标前缀变量：前缀中的<%NODE%>会自动替换为节点主机名的slugified形式（如k8s-node1.dev.raintank.io转为k8s-node1_dev_raintank_io）。

部署示例

1. 编写部署文件（snap_ds.yaml）

yaml
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: snap
  namespace: kube-system
spec:
  template:
    metadata:
      name: snap
      labels:
        daemon: snapd
    spec:
      hostPID: true
      hostNetwork: true
      containers:
      - name: snap
        image: raintank/snap_k8s:v5
        volumeMounts:
          - mountPath: /sys/fs/cgroup
            name: cgroup
          - mountPath: /var/run/docker.sock
            name: docker-sock
          - mountPath: /var/lib/docker
            name: fs-stats
          - mountPath: /usr/local/bin/docker
            name: docker
          - mountPath: /proc_host
            name: proc
          - mountPath: /opt/snap/tasks
            name: snap-tasks
        ports:
        - containerPort: 8181
          hostPort: 8181
          name: snap-api
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        env:
          - name: PROCFS_MOUNT
            value: /proc_host
      volumes:
        - name: dev
          hostPath:
            path: /dev
        - name: cgroup
          hostPath:
            path: /sys/fs/cgroup
        - name: docker-sock
          hostPath:
            path: /var/run/docker.sock
        - name: fs-stats
          hostPath:
            path: /var/lib/docker
        - name: docker
          hostPath:
            path: /usr/bin/docker
        - name: proc
          hostPath:
            path: /proc
        - name: snap-tasks
          configMap:
            name: snap-tasks
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: snap-tasks
  namespace: kube-system
data:
  core.json: |-
    {
        "version": 1,
        "schedule": {
            "type": "simple",
            "interval": "10s"
        },
        "workflow": {
            "collect": {
                "metrics": {
                    "/intel/docker/*":{},
                    "/intel/procfs/cpu/*": {},
                    "/intel/procfs/meminfo/*": {},
                    "/intel/procfs/iface/*": {},
                    "/intel/linux/iostat/*": {},
                    "/intel/procfs/load/*": {}
                },
                "config": {
                    "/intel/procfs": {
                        "proc_path": "/proc_host"
                    }
                },
                "process": null,
                "publish": [
                    {
                        "plugin_name": "graphite",                    
                        "config": {
                            "prefix": "snap.dev.<%NODE%>",
                            "server": "graphite.local",
                            "port": 2003
                        }
                    }
                ]
            }
        }
    }

2. 执行部署命令

bash
kubectl create -f snap_ds.yaml

Grafana仪表盘集成

添加以下仪表盘至Grafana以可视化监控数据：

• Kubernetes Container Stats
• Kubernetes Node host metrics