# Prometheus 监控进程

#### Process-exporter

　　process-exporter可以用来检测所选进程的存活状态

**下载process-exporter**

　　下载地址：<https://github.com/ncabatoff/process-exporter/releases/tag/v0.4.0>　　

**安装部署process-exporter**

```bash
tar -zxvf process-exporter-0.4.0.linux-amd64.tar.gz -C /usr/local/process-exporter
```

　　编写配置文件

### 配置文件根据变量名匹配到配置文件

* {{.Comm}} 包含原始可执行文件的基本名称，即 /proc//stat
* {{.ExeBase}} 包含可执行文件的基本名称
* {{.ExeFull}} 包含可执行文件的标准路径
* {{.Username}} 包含有效用户的用户名

```yaml
cat process-exporter.yaml
process_names:
  
  - name: "{{.Matches}}"
    cmdline:
    - 'dbbakup'
  
  - name: "{{.Matches}}"
    cmdline:
    - 'mysql'
  
  - name: "{{.Matches}}"
    cmdline:
    - 'pushgateway'
```

注 cmdline:  所选进程的唯一标识，ps -ef 可以查询到。如果改进程不存在，则不会有该进程的数据采集到。

\
　　编写启动脚本

```bash
cat /usr/lib/systemd/system/process_exporter.service
[Unit]
Description=Prometheus exporter for processors metrics, written in Go with pluggable metric collectors.
Documentation=https://github.com/ncabatoff/process-exporter
After=network.target
  
[Service]
Type=simple
User=root
WorkingDirectory=/usr/local/process-exporter
ExecStart=/usr/local/process-exporter/process-exporter -config.path=/usr/local/process-exporter/process-exporter.yaml
Restart=on-failure
  
[Install]
WantedBy=multi-user.target
```

**启动process-exporter**

```bash
systemctl daemon-reload
systemctl start process_exporter
systemctl enable process_exporter
```

**验证**

```bash
curl localhost:9256/metrics
```

**修改Prometheus配置文件**

```bash
增加
 
 - job_name: 'process'
    static_configs:
    - targets: ['172.16.8.187:9256']
```

　　重启Prometheus

<br>

<figure><img src="/files/E4V1uIH7nLShKfgfZyDg" alt=""><figcaption></figcaption></figure>

添加告警规则

```yaml
cat process.yml 
groups:
- name: process
  rules:
  - alert: backup-mysql-Down
    expr: absent(namedprocess_namegroup_states{groupname="map[:mysql]"})
    for: 1m
    labels:
      severity: critical
    annotations:
      summary: backup slave mysql docker process Down (instance {{ $labels.instance }})
      description: "backup slave mysql process is down\n LABELS = {{ $labels }}"
 
 
  - alert: pushgateway-Down
    expr: absent(namedprocess_namegroup_states{groupname="map[:pushgateway]"})
    for: 1m
    labels:
      severity: critical
    annotations:
      summary: pushgateway process Down (instance {{ $labels.instance }})
      description: "pushgateway process is down\n LABELS = {{ $labels }}"
 
  - alert: dbback-process-Down
    expr: absent(namedprocess_namegroup_states{groupname="map[:dbbakup]"})
    for: 1m
    labels:
      severity: critical
    annotations:
      summary: dbbackup docker process Down (instance {{ $labels.instance }})
      description: "dbbackup docker process is down\n LABELS = {{ $labels }}"
```


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