Prometheus+Grafana+Altermanager监控告警（六）

redis-exporter

集群监控配置参考：https://www.cnblogs.com/fsckzy/p/12053604.html

安装：

wget https://github.com/oliver006/redis_exporter/releases/download/v0.15.0/redis_exporter-v0.15.0.linux-amd64.tar.gz
tar -zxvf redis_exporter-v0.15.0.linux-amd64.tar.gz -C /usr/local/

启动命令：

nohup /usr/local/redis_exporter -web.listen-address=:9121 -redis.addr 10.3.225.66:6379 -redis.password xxx > /dev/null 2>&1 &

k8s配置redis自动发现，依托于前面的node自动发现

[root@gw_qa_250_10 test]# ls
host_discovery_data  main.py
[root@gw_qa_250_10 test]# ls host_discovery_data/
redis-server.list
[root@gw_qa_250_10 test]# cat host_discovery_data/redis-server.list 
10.3.225.66     redis03-066
[root@gw_qa_250_10 test]# python main.py 
^CTraceback (most recent call last):
  File "main.py", line 67, in <module>
    run()
  File "main.py", line 64, in run
    time.sleep(10)
KeyboardInterrupt
[root@gw_qa_250_10 test]# cat host_discovery_data/redis-server.json 
[{"labels": {"cluster": "redis-server", "alias": "redis03-066", "instance": "10.3.225.66"}, "targets": ["10.3.225.66:9121"]}][root@gw_qa_250_10 test]# 

redis-server.list是配置redis服务列表，main.py将列表转化为Prometheus能认的json

main.py

# -*- coding: utf-8 -*-
import os
import logging
import json
import time


def log_level(level):

    if level == "DEBUG":
        logging.basicConfig(level=logging.DEBUG,
                            format='%(asctime)s - %(levelname)s %(message)s',
                            datefmt='%Y-%m-%d,%H:%M:%S',
                            )
        logging.info("log_level:%s", log_level)
        logging.info("Debug mode")
    else:
        logging.basicConfig(level=logging.INFO,
                            format='%(asctime)s - %(levelname)s %(message)s',
                            datefmt='%Y-%m-%d,%H:%M:%S',
                            )


def read_list_file():
    dirnames = 'host_discovery_data'
    read_file_names = [name for name in os.listdir(dirnames)
            if name.endswith('.list')]
    for read_file_name in read_file_names:

        fo = open(dirnames + '/' + read_file_name, "r")
        node_dict_list = list()
        for fo_line in fo.readlines():
            fo_line = fo_line.rstrip("
")
            # for fo_line_element in fo_line.split():
            #     logging.debug("file_name: %s - fo_line_element: %s", read_file_name, fo_line_element)
            node_ip = fo_line.split()[0]
            node_alias = fo_line.split()[1]
            # logging.debug("node_ip: %s - node_alias: %s", node_ip, node_alias)

            node_dict = dict()
            node_labels_dict = dict()
            node_labels_dict['cluster'] = read_file_name.replace('.list', '')
            node_dict['targets'] = [node_ip + ':9121']
            node_labels_dict['instance'] = node_ip
            node_labels_dict['alias'] = node_alias
            node_dict['labels'] = node_labels_dict
            node_dict_list.append(node_dict)
            # logging.debug("node_dict_list: %s - type %s", node_dict_list, type(node_dict_list))
        node_json = json.dumps(node_dict_list)
        logging.debug("node_json: %s - type %s", node_json, type(node_json))
        # 将json 写入文件
        node_write_filename = dirnames + '/' + read_file_name.replace('.list', '') + '.json'
        fw = open(node_write_filename, "w")
        fw.write(node_json)


def run():
    # 设置LOG 级别
    level = "INFO"
    log_level(level)
    # 持续运行
    while True:
        read_list_file()
        time.sleep(10)

if __name__ == '__main__':
    run()

监控规则redis.rules：

groups:
- name:  Redis.rules
  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
  VALUE = {{ $value }}
  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
  VALUE = {{ $value }}
  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
  VALUE = {{ $value }}
  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
  VALUE = {{ $value }}
  LABELS: {{ $labels }}"

dashboard导入参考：

https://www.cnblogs.com/zeq912/p/10614019.html