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Prometheus 监控 Redis 集群的正确姿势

seuleyang 2022-02-14 阅读 86

Prometheus 监控 Redis 集群


Prometheus 监控Redis的正确姿势(redis集群)

​Prometheus​​ 监控 ​​Redis cluster​​,其实套路都是一样的,使用 ​​exporter​​。

​exporter​​ 负责采集指标,通过 ​​http​​ 暴露给 ​​Prometheus​​ 拉取。​​granafa​​ 则通过这些指标绘图展示数据。​​Prometheus​​ 收集的数据还会根据你设置的告警规则判断是否要发送给 ​​Alertmanager​​, ​​Alertmanager​​ 则要判断是否要发出告警。

​Alertmanager​​ 告警分为三个阶段


  • Inactive 触发告警的规则会被发送到这来。
  • Pending 你设置的等待时间,即规则里面的 for
  • Firing 发送告警到邮件、钉钉之类的

扯远了,开始监控 ​​Redis cluster​

redis_exporter 监控 Redis cluster

监控什么应用,使用的相应的 ​​exporter​​,可以在官网查到。​​EXPORTERS AND INTEGRATIONS
​​

​Redis​​​ 使用 ​​redis_exporter​​​ ,链接:​​redis_exporter​​

支持 Redis 2.x - 5.x

安装及参数

​​下载地址​​

wget https://github.com/oliver006/redis_exporter/releases/download/v1.3.5/redis_exporter-v1.3.5.linux-amd64.tar.gz   
tar zxvf redis_exporter-v1.3.5.linux-amd64.tar.gz
cd redis_exporter-v1.3.5.linux-amd64/
./redis_exporter <flags>

​redis_exporter​​ 支持的参数很多,对我们有用的就几个。

./redis_exporter --help
Usage of ./redis_exporter:
-redis.addr string
Address of the Redis instance to scrape (default "redis://localhost:6379")
-redis.password string
Password of the Redis instance to scrape
-web.listen-address string
Address to listen on for web interface and telemetry. (default ":9121")

单实例 redis 监控

nohup ./redis_exporter -redis.addr 172.18.11.138:6379 -redis.password xxxxx &

​Prometheus​​ 添加单实例

- job_name: redis_since
static_configs:
- targets: ['172.18.11.138:9121']

Redis 集群监控方案

这个挺费劲的,网上查了很多资料,大都是监控单实例的

我试过的方案:

以下两种都会提示认证失败

level=error msg="Redis INFO err: NOAUTH Authentication required."

方法一

nohup ./redis_exporter -redis.addr 172.18.11.139:7000 172.18.11.139:7001 172.18.11.140:7002 172.18.11.140:7003 172.18.11.141:7004 172.18.11.141:7005 -redis.password xxxxx &

方法二

nohup ./redis_exporter -redis.addr redis://h:Lcsmy.312==/@172.18.11.139:7000 redis://h:Lcsmy.312==/@172.18.11.139:7001 redis://h:Lcsmy.312==/@172.18.11.140:7002 redis://h:Lcsmy.312==/@172.18.11.140:7003 redis://h:Lcsmy.312==/@172.18.11.141:7004 redis://h:Lcsmy.312==/@172.18.11.141:7005 -redis.password xxxxx &

本来想采取最low 的方法,一个实例启一个 ​​redis_exporter​​​。这样子的话,集群那里很多语句都用不了,比如 ​​cluster_slot_fail​​。放弃该方法

nohup ./redis_exporter -redis.addr 172.18.11.139:7000  -redis.password xxxxxx  -web.listen-address 172.18.11.139:9121 > /dev/null 2>&1 &
nohup ./redis_exporter -redis.addr 172.18.11.139:7001 -redis.password xxxxxx -web.listen-address 172.18.11.139:9122 > /dev/null 2>&1 &
nohup ./redis_exporter -redis.addr 172.18.11.140:7002 -redis.password xxxxxx -web.listen-address 172.18.11.139:9123 > /dev/null 2>&1 &
nohup ./redis_exporter -redis.addr 172.18.11.140:7003 -redis.password xxxxxx -web.listen-address 172.18.11.139:9124 > /dev/null 2>&1 &
nohup ./redis_exporter -redis.addr 172.18.11.141:7004 -redis.password xxxxxx -web.listen-address 172.18.11.139:9125 > /dev/null 2>&1 &
nohup ./redis_exporter -redis.addr 172.18.11.141:7005 -redis.password xxxxxx -web.listen-address 172.18.11.139:9126 > /dev/null 2>&1 &

最后只好去 ​​github​​​ 提 ​​issue​​。用我的中国式英语和作者交流,终于明白了。。。其实官方文档已经写了。

scrape_configs:
## config for the multiple Redis targets that the exporter will scrape
- job_name: 'redis_exporter_targets'
static_configs:
- targets:
- redis://first-redis-host:6379
- redis://second-redis-host:6379
- redis://second-redis-host:6380
- redis://second-redis-host:6381
metrics_path: /scrape
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [__param_target]
target_label: instance
- target_label: __address__
replacement: <<REDIS-EXPORTER-HOSTNAME>>:9121

## config for scraping the exporter itself
- job_name: 'redis_exporter'
static_configs:
- targets:
- <<REDIS-EXPORTER-HOSTNAME>>:9121

Redis 集群实际操作

启动 ​​redis_exporter​

nohup ./redis_exporter -redis.password xxxxx  &

重点

在 ​​prometheus​​ 里面如何配置:

- job_name: 'redis_exporter_targets'
static_configs:
- targets:
- redis://172.18.11.139:7000
- redis://172.18.11.139:7001
- redis://172.18.11.140:7002
- redis://172.18.11.140:7003
- redis://172.18.11.141:7004
- redis://172.18.11.141:7005
metrics_path: /scrape
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [__param_target]
target_label: instance
- target_label: __address__
replacement: 172.18.11.139:9121
## config for scraping the exporter itself
- job_name: 'redis_exporter'
static_configs:
- targets:
- 172.18.11.139:9121

这样子就能采集到集群的数据了。但是日志里提示

time="2019-12-17T09:10:49+08:00" level=error msg="Couldn't connect to redis instance"

午休的时候突然想明白了,只要能连接到一个集群的一个节点,自然就能查询其他节点的指标了。于是启动命令改为:

nohup ./redis_exporter -redis.addr 172.18.11.141:7005  -redis.password xxxxx &

​Prometheus​​ 配置不变

送上几张图片:

Prometheus 监控 Redis 集群的正确姿势_单实例

Prometheus 监控 Redis 集群的正确姿势_redis_02

Prometheus 监控 Redis 集群的正确姿势_Prometheus_03

告警规则

groups:
- name: Redis
rules:
- alert: RedisDown
expr: redis_up == 0
for: 5m
labels:
severity: error
annotations:
summary: "Redis down (instance {{ $labels.instance }})"
description: "Redis 挂了啊,mmp\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: MissingBackup
expr: time() - redis_rdb_last_save_timestamp_seconds > 60 * 60 * 24
for: 5m
labels:
severity: error
annotations:
summary: "Missing backup (instance {{ $labels.instance }})"
description: "Redis has not been backuped for 24 hours\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: OutOfMemory
expr: redis_memory_used_bytes / redis_total_system_memory_bytes * 100 > 90
for: 5m
labels:
severity: warning
annotations:
summary: "Out of memory (instance {{ $labels.instance }})"
description: "Redis is running out of memory (> 90%)\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: ReplicationBroken
expr: delta(redis_connected_slaves[1m]) < 0
for: 5m
labels:
severity: error
annotations:
summary: "Replication broken (instance {{ $labels.instance }})"
description: "Redis instance lost a slave\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: TooManyConnections
expr: redis_connected_clients > 1000
for: 5m
labels:
severity: warning
annotations:
summary: "Too many connections (instance {{ $labels.instance }})"
description: "Redis instance has too many connections\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: NotEnoughConnections
expr: redis_connected_clients < 5
for: 5m
labels:
severity: warning
annotations:
summary: "Not enough connections (instance {{ $labels.instance }})"
description: "Redis instance should have more connections (> 5)\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
- alert: RejectedConnections
expr: increase(redis_rejected_connections_total[1m]) > 0
for: 5m
labels:
severity: error
annotations:
summary: "Rejected connections (instance {{ $labels.instance }})"
description: "Some connections to Redis has been rejected\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"



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