2020-07-01-zookeper--linux版与spri

1.下载linux版本的zookeper，将conf下的配置文件改成zoo.cf。确保jdk不是openjdk如果是openjdk的话在官网上下载对应的linux版本的jdk。
2.在conf文件下启动zookeper， ./zkServer.sh start
3.测试zookeper，./zkCli.sh
4.spring boot整合zookepper，这里要注意zookeper的依赖要与装的版本相对应。这里存在版本依赖冲突的问题，首先是zookeeper自身带的版本与虚拟机装的版本冲突，还有的是zk中的sflp日志相关的依赖冲突问题，需要先排除掉，需要添加新的以来的加上自己需要的版本依赖。

  <dependencies>
        <dependency>
            <groupId>com.shuai.springcloud2</groupId>
            <artifactId>cloud-coment</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.5.8</version>
            <exclusions>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>

5.zk的节点是临时节点，它没有eureka的自我保护机制，当服务挂掉之后如果没有心跳就会清除服务。