一、为什么要服务发现（sd：service discovery ）
希望服务发现能做什么
- 自动添加 target ，海量的服务添加实在不便；
- 自动配置 lable ，lable 的设计和添加比 target 添加还麻烦；
- 无需重启 prometheus ；
二、prometheus 当前支持的 sd_config 配置
| 自带配置 | 适配 | 说明 |
|---|---|---|
| azure_sd_config | 微软 Azure 云 | Azure SD configurations allow retrieving scrape targets from Azure VMs. |
| consul_sd_config | ||
| digitalocean_sd_config | ||
| docker_sd_config | ||
| dockerswarm_sd_config | ||
| dns_sd_config | ||
| ec2_sd_config | ||
| openstack_sd_config | ||
| ovhcloud_sd_config | ||
| puppetdb_sd_config | ||
file_sd_config |
||
| gce_sd_config | ||
| hetzner_sd_config | ||
http_sd_config |
||
| ionos_sd_config | ||
| kubernetes_sd_config | ||
| kuma_sd_config | ||
| lightsail_sd_config | ||
| linode_sd_config | ||
| marathon_sd_config | ||
| nerve_sd_config | ||
| nomad_sd_config | ||
| serverset_sd_config | ||
| triton_sd_config | ||
| eureka_sd_config | ||
| scaleway_sd_config | ||
| uyuni_sd_config | ||
| vultr_sd_config |
三、 http_sd_config 和 file_sd_config 对比
| Item | File SD | HTTP SD |
|---|---|---|
| Event Based | Yes, via inotify | No |
| Update frequency | Instant, thanks to inotify | Following refresh_interval |
| Format | Yaml or JSON | JSON |
| Transport | Local file | HTTP/HTTPS |
| Security | File-Based security | TLS, Basic auth, Authorization header, OAuth2 |
四、http_sd_config
需要开发部署一个HTTP SD endpoint，prometheus周期性的http访问该endpoint获取targets。如下是返回格式范例：
Example response body:
[
{
"targets": [ "<host>", ... ],
"labels": {
"<labelname>": "<labelvalue>", ...
}
},
...
]
[
{
"targets": ["10.0.10.2:9100", "10.0.10.3:9100", "10.0.10.4:9100", "10.0.10.5:9100"],
"labels": {
"__meta_datacenter": "london",
"__meta_prometheus_job": "node"
}
},
{
"targets": ["10.0.40.2:9100", "10.0.40.3:9100"],
"labels": {
"__meta_datacenter": "london",
"__meta_prometheus_job": "alertmanager"
}
},
{
"targets": ["10.0.40.2:9093", "10.0.40.3:9093"],
"labels": {
"__meta_datacenter": "newyork",
"__meta_prometheus_job": "alertmanager"
}
}
]
五、file_sd_config
prometheus.yml 配置文件增加如下
scrape_configs:
- job_name: 'node'
file_sd_configs:
- files:
- 'targets.json'
编辑 targets.json
[
{
"targets": [
"localhost:9100"
],
"labels": {
"job": "node"
}
},
{
"targets": [
"localhost:9200"
],
"labels": {
"job": "node"
}
}
]
[
{
"labels": {
"job": "logstash1",
"env": "dev"
},
"targets": [
"localhost:9501",
"localhost:9502",
"localhost:9503"
]
}
]
[
{
"targets": ["localhost:9090", "example.org:443"]
}
]
yaml 格式
- targets:
[ - '<host>' ]
labels:
[ <labelname>: <labelvalue> ... ]
- targets: ['localhost:9090', 'example.org:443']
- targets: ['10.98.29.9:9100', '10.98.29.12:9100', '10.98.29.15:9100']
labels:
job: rtms-nacos
env: prd
- targets:
- 10.98.29.9:9100
- 10.98.29.12:9100
- 10.98.29.15:9100
labels:
job: rtms-nacos
env: prd
