日志采集项目(二)Etcd的使用
ETCD 介绍
- 概念: 高可用的分布式key-value存储,实现配置共享和服务发现
- 类似项目: zookeeper和consul
- 开发语言: Go
- 接口: 提供restful的http接口,使用简单
- 实现算法: 基于raft算法的强一致性,高可用的服务存储目录
ETCD的应用场景
- 服务发现和注册
- 配置中心
- 分布式锁
- master选举
ETCD环境搭建
- 下载地址:https://github.com/etcd-io/etcd/releases/download/v3.4.7/etcd-v3.4.7-linux-amd64.tar.gz
- 启动方式: bin/etcd 可以直接启动
[root@centos7-node1 etcd]# nohup ./etcd --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-advertise-peer-urls http://0.0.0.0:2380 & #启动etcd
- etcdctl使用
[root@centos7-node1 ~]# cd /opt/application/etcd/
[root@centos7-node1 etcd]# ./etcdctl --endpoints "http://localhost:2379" put /logagent/conf 333333
[root@centos7-node1 etcd]# ./etcdctl --endpoints "http://localhost:2379" watch /logagent/conf
[root@centos7-node1 etcd]# ./etcdctl --endpoints "http://localhost:2379" del /logagent/conf
- go实现watch功能
安装v3插件
go get go.etcd.io/etcd/clientv3
代码
代码语言:javascript复制package main
import (
"context"
"fmt"
"go.etcd.io/etcd/clientv3"
"time"
)
func main() {
client,err := clientv3.New(clientv3.Config{
Endpoints: []string{"192.168.56.11:2379"},
DialTimeout: time.Second*3,
})
defer client.Close()
fmt.Printf("conn succn")
for {
resultChan := client.Watch(context.Background(),"/logagent/conf")
for v := range resultChan{
if v.Err() != nil {
fmt.Printf("watch faild,err:%vn",err)
continue
}
for _,e := range v.Events {
fmt.Printf("event_type:%v,key:%v,val:%vn",e.Type,e.Kv.Key,string(e.Kv.Value))
}
}
}
}
- go 实现put功能
package main
import (
"context"
"fmt"
"go.etcd.io/etcd/clientv3"
"time"
)
func main() {
client,err := clientv3.New(clientv3.Config{
Endpoints: []string{"192.168.56.11:2379"},
DialTimeout: time.Second*3,
})
defer client.Close()
fmt.Printf("conn succn")
_,err = client.Put(context.Background(),"/logagent/conf","sddadas")
if err != nil {
fmt.Printf("Put faild,err:%vn",err)
}
}
- kafka消费代码
package main
import (
"fmt"
"github.com/Shopify/sarama"
"sync"
)
var wg sync.WaitGroup
func main() {
//连接配置
consumer,err := sarama.NewConsumer([]string{"192.168.56.11:9092"},nil)
if err != nil {
fmt.Printf("consumer mesage faild,error:%vn",err)
return
}
fmt.Printf("conn succn")
pt,err := consumer.Partitions("nginx_log")
if err != nil {
fmt.Printf("get partions aild,err:%vn",err)
return
}
for _,p := range pt {
pc, err := consumer.ConsumePartition("nginx_log",p,sarama.OffsetNewest)
if err != nil {
fmt.Printf("consumer faild,error:%vn",err)
continue
}
wg.Add(1)
go func() {
for m := range pc.Messages() {
fmt.Printf("topic:%v,value:%vn",m.Topic,string(m.Value))
}
wg.Done()
}()
}
wg.Wait()
}