Heapster介绍
1. heapster简介
Heapster是容器集群监控和性能分析工具，天然的支持Kubernetes和CoreOS。 Kubernetes有个出名的监控agent—cAdvisor。在每个kubernetes Node上都会运行cAdvisor，它会收集本机以及容器的监控数据(cpu,memory,filesystem,network,uptime)。
2. heapster部署与配置
2.1. 注意事项
需同步部署机器和被采集机器的时间：ntpdate time.windows.com
加入定时任务，定期同步时间
crontab –e
30 5 * * * /usr/sbin/ntpdate time.windows.com //每天早晨5点半执行
2.2. 容器式部署
#拉取镜像
docker pull heapster:latest
#运行容器
docker run -d -p 8082:8082 --net=host heapster:latest --source=kubernetes:http://<k8s-server-ip>:8080?inClusterConfig=false\&useServiceAccount=false --sink=influxdb:http://<influxdb-ip>:8086?db=<k8s_env_zone>
2.3. 配置说明
可以参考官方文档
2.3.1. –source
–source: 指定数据获取源。这里指定kube-apiserver即可。 后缀参数： inClusterConfig: kubeletPort: 指定kubelet的使用端口，默认10255 kubeletHttps: 是否使用https去连接kubelets(默认：false) apiVersion: 指定K8S的apiversion insecure: 是否使用安全证书(默认：false) auth: 安全认证 useServiceAccount: 是否使用K8S的安全令牌
2.3.2. –sink
–sink: 指定后端数据存储。这里指定influxdb数据库。 后缀参数： user: InfluxDB用户 pw: InfluxDB密码 db: 数据库名 secure: 安全连接到InfluxDB(默认：false) withfields： 使用InfluxDB fields(默认：false)。
3. Metrics
| 分类 | Metric Name | Description | 备注 |
|---|---|---|---|
| cpu | cpu/limit | CPU hard limit in millicores. | CPU上限 |
| cpu/node_capacity | Cpu capacity of a node. | Node节点的CPU容量 | |
| cpu/node_allocatable | Cpu allocatable of a node. | Node节点可分配的CPU | |
| cpu/node_reservation | Share of cpu that is reserved on the node allocatable. | ||
| cpu/node_utilization | CPU utilization as a share of node allocatable. | ||
| cpu/request | CPU request (the guaranteed amount of resources) in millicores. | ||
| cpu/usage | Cumulative CPU usage on all cores. | CPU总使用量 | |
| cpu/usage_rate | CPU usage on all cores in millicores. | ||
| filesystem | filesystem/usage | Total number of bytes consumed on a filesystem. | 文件系统的使用量 |
| filesystem/limit | The total size of filesystem in bytes. | 文件系统的使用上限 | |
| filesystem/available | The number of available bytes remaining in a the filesystem | 可用的文件系统容量 | |
| filesystem/inodes | The number of available inodes in a the filesystem | ||
| filesystem/inodes_free | The number of free inodes remaining in a the filesystem | ||
| memory | memory/limit | Memory hard limit in bytes. | 内存上限 |
| memory/major_page_faults | Number of major page faults. | ||
| memory/major_page_faults_rate | Number of major page faults per second. | ||
| memory/node_capacity | Memory capacity of a node. | ||
| memory/node_allocatable | Memory allocatable of a node. | ||
| memory/node_reservation | Share of memory that is reserved on the node allocatable. | ||
| memory/node_utilization | Memory utilization as a share of memory allocatable. | ||
| memory/page_faults | Number of page faults. | ||
| memory/page_faults_rate | Number of page faults per second. | ||
| memory/request | Memory request (the guaranteed amount of resources) in bytes. | ||
| memory/usage | Total memory usage. | ||
| memory/cache | Cache memory usage. | ||
| memory/rss | RSS memory usage. | ||
| memory/working_set | Total working set usage. Working set is the memory being used and not easily dropped by the kernel. | ||
| network | network/rx | Cumulative number of bytes received over the network. | |
| network/rx_errors | Cumulative number of errors while receiving over the network. | ||
| network/rx_errors_rate | Number of errors while receiving over the network per second. | ||
| network/rx_rate | Number of bytes received over the network per second. | ||
| network/tx | Cumulative number of bytes sent over the network | ||
| network/tx_errors | Cumulative number of errors while sending over the network | ||
| network/tx_errors_rate | Number of errors while sending over the network | ||
| network/tx_rate | Number of bytes sent over the network per second. | ||
| uptime | Number of milliseconds since the container was started. | - |
4. Labels
| Label Name | Description |
|---|---|
| pod_id | Unique ID of a Pod |
| pod_name | User-provided name of a Pod |
| pod_namespace | The namespace of a Pod |
| container_base_image | Base image for the container |
| container_name | User-provided name of the container or full cgroup name for system containers |
| host_id | Cloud-provider specified or user specified Identifier of a node |
| hostname | Hostname where the container ran |
| labels | Comma-separated(Default) list of user-provided labels. Format is 'key:value' |
| namespace_id | UID of the namespace of a Pod |
| resource_id | A unique identifier used to differentiate multiple metrics of the same type. e.x. Fs partitions under filesystem/usage |
5. heapster API
见官方文档：https://github.com/kubernetes/heapster/blob/master/docs/model.md
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