Prometheus 监控 Redis 应用

使用Prometheus监控Redis，推荐使用官方插件：
https://github.com/oliver006/redis_exporter这个exporter。 目前我们主要使用的是redis的主从复制搭配Sentinel实现的高可用方案。
部署方式：
将exporter部署在虚拟机上解压后执行：

redis_exporter -web.listen-address=:9121 -redis.addr redis://xxxx:26379 -redis.password password

redis_exporter提供了一个Grafana Dashboard画图 Grafana Dashboard

prometheus server配置：

global:
  scrape_interval: 10s
  scrape_timeout: 10s
  evaluation_interval: 1m
alerting:
  alertmanagers:
  - scheme: http
    static_configs:
    - targets:
      - "xxxx:9093"
rule_files:
  - /usr/local/prometheus/rules/*.rules
scrape_configs:
- job_name: 'file-ds'
  file_sd_configs:
  - refresh_interval: 1m
    files:
    - ./conf.d/targets*.json
- job_name: 'redis'
  file_sd_configs:
  - refresh_interval: 1m
    files:
    - ./conf.d/redis*.json
 [xxx@prometheus01 prometheus]# cat  conf.d/redis-discovery.json
[

{
"targets": ["xxxx:9121"],
"labels": {
"instance": "preproduct-redis-xxx:9121"
}
}
]

添加报警规则：

[xxx@prometheus01 prometheus]# cat  /usr/local/prometheus/rules/redis_alert.rules
groups:
- name: RedisStatsAlert
  rules:
  - alert: Redis is down
    expr: redis_up == 0
    for: 1m
    labels:
      severity: critical
    annotations:
      summary: "Instance {{ $labels.instance }} Redis is down"
      description: "Redis database is down. This requires immediate action!"
#  - alert: 最近一次创建 RDB 文件，操作失败                       
#    expr: redis_rdb_last_bgsave_duration_sec == 0
#    for: 1m
#    labels:
#      severity: warning
#    annotations:
#      summary: " Instance {{ $labels.instance }} rdb_last_bgsave_status  "
#      description: "最近一次创建 RDB 文件的结果是失败"
  - alert: master link status（复制连接当前的状态）                                     
    expr: redis_master_link_up == 0
    for: 1m
    labels:
      severity: warning
    annotations:
      summary: "Instance {{ $labels.instance }} 复制连接当前断开"
      description: "redis_master_link状态是0 关闭状态"
#  - alert: 最近一次创建 AOF 文件失败
#    expr: redis_aof_last_rewrite_duration_sec == 0
#    for: 1m
#    labels:
#      severity: warning
#    annotations:
#      summary: "Instance {{ $labels.instance }} redis aof last rewrite duration sec"
#      description: "最近一次创建 AOF 文件失败"