Zookeeper

https://zookeeper.apache.org/

下载安装包

mkdir -p /opt/zookeeper /opt/zookeeper/data /opt/zookeeper/dataLog
cd /opt/zookeeper  
wget https://dlcdn.apache.org/zookeeper/zookeeper-3.8.3/apache-zookeeper-3.8.3-bin.tar.gz --no-check-certificate

关于 --no-check-certificate

因为网站限制了只能用浏览器下载文件，如果不添加该参数可能会遇到以下问题。

• 错误1：

  ERROR: cannot verify apache.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
  Issued certificate has expired.
  

  错误1可以通过下面的命令解决

  yum install -y ca-certificates
  

• 错误2：

  Unable to establish SSL connection.
  

  错误2可以通过添加代理参数user-agent解决，例如：

  wget https://dlcdn.apache.org/zookeeper/zookeeper-3.8.3/apache-zookeeper-3.8.3-bin.tar.gz --user-agent="Mozilla/5.0 (X11;U;Linux i686;en-US;rv:1.9.0.3) Geco/2008092416 Firefox/3.0.3"
  

解压

tar -zxvf apache-zookeeper-3.8.3-bin.tar.gz
ln -s apache-zookeeper-3.8.3-bin zookeeper

修改配置

cd /opt/zookeeper/zookeeper/conf  
cp zoo_sample.cfg zoo.cfg  
vim zoo.cfg

注释

#dataDir=/tmp/zookeeper

添加

dataDir=/opt/zookeeper/data
dataLogDir=/opt/zookeeper/dataLog

启动，查看状态，停止，重启

cd /opt/zookeeper/zookeeper/bin

启动

./zkServer.sh start

查看状态

./zkServer.sh status

停止

./zkServer.sh stop

重启

./zkServer.sh restart

查看日志

cd /opt/zookeeper/zookeeper/logs

客户端 zkCli.sh

cd /opt/zookeeper/zookeeper/bin
./zkCli.sh

执行上面的命令后，会进入对话框
查看目录

ls /
ls /zookeeper
ls /dubbo
get /dubbo

编辑目录

#创建了一个新的 znode 节点 zk 以及与它关联的字符串
create /zk "myData"
#修改值
set /zk "newVal"
#删除
delete /zk