ZooKeeper分布式协调服务设计核心概念及安装配置

[root@ZooKeeper ~]# ls
anaconda-ks.cfg  jdk-8u181-linux-x64.tar.gz
[root@ZooKeeper ~]# tar zxf jdk-8u181-linux-x64.tar.gz 
[root@ZooKeeper ~]# ls
anaconda-ks.cfg  jdk1.8.0_181  jdk-8u181-linux-x64.tar.gz
[root@ZooKeeper ~]# mv jdk1.8.0_181 /usr/local/java
[root@ZooKeeper ~]# cat <<END >> /etc/profile
export JAVA_HOME=/usr/local/java
export PATH=$PATH:$JAVA_HOME/bin
END
[root@ZooKeeper ~]# source /etc/profile
[root@ZooKeeper ~]# java -version

[root@ZooKeeper ~]# wget http://dlcdn.apache.org/zookeeper/zookeeper-3.6.3/apache-zookeeper-3.6.3-bin.tar.gz
[root@ZooKeeper ~]# ls
anaconda-ks.cfg  apache-zookeeper-3.6.3-bin.tar.gz  jdk-8u181-linux-x64.tar.gz
[root@ZooKeeper ~]# tar zxf apache-zookeeper-3.6.3-bin.tar.gz
[root@ZooKeeper ~]# mv apache-zookeeper-3.6.3-bin /usr/local/zookeeper
[root@ZooKeeper ~]# mkdir /usr/local/zookeeper/data
[root@ZooKeeper ~]# cat <<END >> /usr/local/zookeeper/conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/usr/local/zookeeper/data
clientPort=2181
END

[root@ZooKeeper ~]# /usr/local/zookeeper/bin/zkServer.sh start						# 启动
[root@ZooKeeper ~]# /usr/local/zookeeper/bin/zkServer.sh status						# 查看状态

[root@ZooKeeper ~]# /usr/local/zookeeper/bin/zkCli.sh -server 127.0.0.1:2181
Welcome to ZooKeeper!
JLine support is enabled
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: 127.0.0.1:2181(CONNECTED) 0] 

[root@ZooKeeper ~]# git clone https://github.com/samuel/go-zookeeper.git
[root@ZooKeeper ~]# mv go-zookeeper /usr/local/go/src/

package main
import (
    "fmt"
    "time"
    "go-zookeeper/zk"
)
func main() {
    Hosts := []string{"192.168.1.1:2181"}
    conn, _, err := zk.Connect(Hosts,time.Second * 5)
    defer conn.Close()
    if err != nil {
        fmt.Println(err)
        return
    }
}

package main
import (
    "fmt"
    "time"
    "go-zookeeper/zk"
)
var (
    path = "/Zzz"
)
//增
func add(conn *zk.Conn) {
    var data = []byte("Hello ZooKeeper")
    // flags 的四种取值方式:
    // 0 (永久.除非手动删除)
    // zk.FlagEphemeral = 1 (短暂. session 断开则该节点也被删除)
    // zk.FlagSequence = 2 (会自动在节点后面添加序号)
    // 3 (Ephemeral 和 Sequence. 即短暂且自动添加序号)
	var flags int32 = 0
	// 获取访问控制权限
	acls := zk.WorldACL(zk.PermAll)
	create, err := conn.Create(path,data,flags,acls)
	if err != nil {
	    fmt.Printf("创建失败: %v\n",err)
		return
    }
	fmt.Printf("创建: %v 成功\n",create)
}
// 查
func get(conn *zk.Conn) {
    data, _, err := conn.Get(path)
	if err != nil {
	    fmt.Printf("查询 %s 失败,err: %v\n",path,err)
	    return
	}
	fmt.Printf("%s 的值为 %s\n",path,string(data))
}
// 删除与增加不同在于其函数中的 Version 参数. 其中 Version 使用 CAS 支持 (可以通过此种方式保证原子性)
// 改
func modify(conn *zk.Conn) {
    new_data := []byte("This is ZooKeeper")
    _, sate, _ := conn.Get(path)
    _, err := conn.Set(path,new_data,sate.Version)
    if err != nil {
	    fmt.Printf("数据修改失败: %v\n",err)
	    return
    }
    fmt.Println("数据修改成功")
}
// 删
func del(conn *zk.Conn) {
    _, sate, _ := conn.Get(path)
    err := conn.Delete(path,sate.Version)
    if err != nil {
        fmt.Printf("数据删除失败: %v\n",err)
	    return
    }
    fmt.Println("数据删除成功")
}
func main() {
    hosts := []string{"192.168.1.1:2181"}
    conn, _, err := zk.Connect(hosts,time.Second * 5)
    defer conn.Close()
    if err != nil {
        fmt.Println(err)
	    return
    }
    /* 增删改查 */
    add(conn)
    get(conn)
    modify(conn)
    get(conn)
    del(conn)
}

[root@ZooKeeper ~]# scp -r /usr/local/java root@192.168.1.2:/usr/local/
[root@ZooKeeper ~]# scp -r /usr/local/zookeeper root@192.168.1.2:/usr/local/

[root@ZooKeeper ~]# cat <<END >> /etc/profile
export JAVA_HOME=/usr/local/java
export PATH=$PATH:$JAVA_HOME/bin
END
[root@ZooKeeper ~]# source /etc/profile
[root@ZooKeeper ~]# /usr/local/zookeeper/bin/zkServer.sh start

[root@ZooKeeper ~]# cat <<END >> /usr/local/zookeeper/conf/zoo.cfg
server.1=192.168.1.1:2888:3888
server.2=192.168.1.2:2889:3889
server.3=192.168.1.3:2890:3890
END

[root@ZooKeeper ~]# echo "1" > /usr/local/zookeeper/data/myid
[root@ZooKeeper-2 ~]# echo "2" > /usr/local/zookeeper/data/myid
[root@ZooKeeper-2 ~]# echo "3" > /usr/local/zookeeper/data/myid

[root@ZooKeeper ~]# /usr/local/zookeeper/bin/zkServer.sh restart			# 三台服务器都要重启