Loki安装

i 这里我们以 docker 安装为主,更多安装方式请参考文末连接.

官网建议生产环境使用 Helm 或者 Tanka 方式安装,docker 方式安装的适用于开发环境和测试环境.- by jonnyan404 https://mrdoc.fun

方式一

下载配置文件

mkdir -p /opt/loki/conf
cd /opt/loki/conf

wget https://raw.githubusercontent.com/grafana/loki/v2.2.0/cmd/loki/loki-local-config.yaml -O loki-config.yaml
wget https://raw.githubusercontent.com/grafana/loki/v2.2.0/cmd/promtail/promtail-docker-config.yaml -O promtail-config.yaml

安装Loki

docker run -d --name=loki -v /opt/loki/conf:/mnt/config -p 3100:3100 grafana/loki:2.2.0 -config.file=/mnt/config/loki-config.yaml

查看metrics数据

http://IP:3100/metrics

查看loki运行状态

http://IP:3100/ready

安装promtail

仅搜集docker日志,此步可省略.

docker run -d --name=promtail -v /opt/loki/conf:/mnt/config -v /var/log:/var/log grafana/promtail:2.2.0 -config.file=/mnt/config/promtail-config.yaml

安装grafana

docker run -d --name=grafana 
  --restart always 
  -p 3000:3000 
  -v /opt/loki/grafana-storage:/var/lib/grafana 
  grafana/grafana

打开 http://IP:3000 访问grafana，默认用户密码为admin/admin。

选择左侧设置--->Data Sources--->Add data source，搜索Loki配置HTTP URL为 http://IP:3100

完成后选择左侧设置--->Preferences，修改底部默认时区为 Asia/Shanghai。

选择左侧Explore查看日志，可以基于文件名或标签查看.

方式二

下载docker-compose.yml

wget https://raw.githubusercontent.com/grafana/loki/v2.2.0/production/docker-compose.yaml -O docker-compose.yaml

修改docker-compose.yml

version: "3"

networks:
  loki:

volumes:
  loki-config:
  promtail-config:
  grafana-storage:

services:
  loki:
    image: grafana/loki:2.0.0
	container_name: loki
	environment:
      - TZ=Asia/Shanghai
      - LANG=zh_CN.UTF-8
    ports:
      - "3100:3100"
    command: -config.file=/etc/loki/local-config.yaml
	volumes:
      - loki-config:/etc/loki
    networks:
      - loki

  promtail:
    image: grafana/promtail:2.0.0
	container_name: promtail
	environment:
      - TZ=Asia/Shanghai
      - LANG=zh_CN.UTF-8
    volumes:
      - /var/log:/var/log
	  - promtail-config:/etc/promtail
    command: -config.file=/etc/promtail/config.yml
    networks:
      - loki

  grafana:
    image: grafana/grafana:latest
	container_name: grafana
    ports:
      - "3000:3000"
	environment:
      - TZ=Asia/Shanghai
      - LANG=zh_CN.UTF-8
	volumes:
      - grafana-storage:/var/lib/grafana
    networks:
      - loki

启动docker-compose.yml

docker-compose -f docker-compose.yaml up

3.监控docker日志

被监控机器安装Loki日志插件

docker plugin install grafana/loki-docker-driver:latest --alias loki --grant-all-permissions
docker plugin ls

全局日志搜集设置

编辑daemon.json。linux下默认路径是/etc/docker/daemon.json (需要sudo)， windows则默认是%userprofile%.dockerdaemon.json

{
    "log-driver": "loki",
    "log-opts": {
        "loki-url": "http://YOUR_IP:3100/loki/api/v1/push",
        "loki-batch-size": "400",
		"max-size": "50m",
    	"max-file": "10"
    }
}

然后重启docker服务生效

指定容器搜集

docker run --rm --name=grafana --log-driver=loki --log-opt loki-url="http://YOUR_IP:3100/loki/api/v1/push" --log-opt max-size=50m --log-opt max-file=10 grafana/grafana

在 docker run 命令后增加红色内容即可

docker-compose配置日志输出到loki

docker-compose 小于3.4可以对需要日志输出的配置添加配置如下

version: "3"
services:
  promtail:
    image: grafana/promtail
    container_name: promtail
    restart: always
    volumes:
      - $PWD:/etc/promtail
      - /app/promtail:/opt
      - /app/promtail/log:/var/log
    command:
      -config.file=/etc/promtail/promtail-docker-config.yaml
    logging:
      driver: loki
      options:
        loki-url: "http://YOUR_IP:3100/loki/api/v1/push"
        max-size: "50m"
        max-file: "10"

对于3.4极其以上版本可以通过定义模板来减少代码量

version: "3.4"

x-logging:
  &loki-logging
  driver: loki
  options:
    loki-url: "http://YOUR_IP:3100/loki/api/v1/push"
    max-size: "50m"
    max-file: "10"

services:
  host:
    container_name: grafana
    image: grafana/grafana
    environment:
    - TZ=Asia/Shanghai
    - LANG=zh_CN.UTF-8
    logging: *loki-logging

&loki-logging 表示定义模板

*loki-logging 表示引用模板。
对于多个服务就只需要对应加上一行 logging: *loki-logging 即可。

Reference Link

• by jonnyan404 https://mrdoc.fun
• 官网:https://grafana.com/docs/loki/latest/installation/docker/
• 日志驱动:https://github.com/grafana/loki/blob/master/docs/sources/clients/docker-driver/_index.md
• Loki原理简介:https://segmentfault.com/a/1190000023379491
• https://www.kancloud.cn/willseecloud/elasticsearch/1857769
• loki 源码解析: https://aleiwu.com/post/grafana-loki/
• http://52manong.com/60197.html