ZooKeeper安装使用

栏目: 编程工具 · 发布时间: 6年前

内容简介:相信大家对ZooKeeper应该不算陌生,ZooKeeper的使用和ZooKeeper集群的搭建并不复杂,这里分享自己看到的一些好文章以及使用Ansible快速部署和手动部署ZooKeeper的经验分享。ZooKeeper分布式环境的协调利器2018年09月27日 - 初稿

相信大家对ZooKeeper应该不算陌生,ZooKeeper的使用和ZooKeeper集群的搭建并不复杂,这里分享自己看到的一些好文章以及使用Ansible快速部署和手动部署ZooKeeper的经验分享。

ZooKeeper分布式环境的协调利器

更新历史

2018年09月27日 - 初稿

阅读原文 - https://wsgzao.github.io/post/zookeeper/

扩展阅读

ZooKeeper - https://zookeeper.apache.org/

ZooKeeper简介

ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications. Each time they are implemented there is a lot of work that goes into fixing the bugs and race conditions that are inevitable. Because of the difficulty of implementing these kinds of services, applications initially usually skimp on them ,which make them brittle in the presence of change and difficult to manage. Even when done correctly, different implementations of these services lead to management complexity when the applications are deployed.

ZooKeeper是一个开源的为分布式应用提供分布式协调的服务。它公开了一组简单的原语,分布式应用程序可以基于这些原语实现更高级别的服务,包括同步、维护配置、组和命名。它的设计易于编程,它使用一个遵循文件系统中常见的目录树结构的数据模型。它在 Java 环境中运行,对Java和C都有绑定。

协调服务是出了名的难。它们特别容易出错,如竞态条件和死锁。ZooKeeper背后的动机是让分布式应用从零开始实现一站式协调服务。

可能是全网把 ZooKeeper 概念讲的最清楚的一篇文章

https://github.com/Snailclimb/JavaGuide/blob/master/%E4%B8%BB%E6%B5%81%E6%A1%86%E6%9E%B6/ZooKeeper.md

jdk

install jdk by ansible

https://galaxy.ansible.com/geerlingguy/java

# download
ansible-galaxy install geerlingguy.java
# create yaml file and config java version
vi install_jdk.yml

---
- hosts: all
  roles:
    - role: geerlingguy.java
      when: "ansible_os_family == 'RedHat'"
      java_packages:
        - java-1.8.0-openjdk

install jdk manually

http://www.oracle.com/technetwork/java/javase/downloads/index.html

# yum
yum install java-1.8.0-openjdk
# rpm
yum localinstall -y jdk-8u181-linux-x64.rpm
# set env
vi /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_181
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib 
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOME/bin 

source /etc/profile

zookeeper

install zookeeper by ansible

https://galaxy.ansible.com/ansibleshipyard/ansible-zookeeper

# download
ansible-galaxy install AnsibleShipyard.ansible-zookeeper
# create yaml file and config java version
vi install_zookeeper.yml

---
- name: Installing ZooKeeper
  hosts: all
  sudo: yes
  vars:
    zookeeper_version: 3.4.12
  roles:
    - role: AnsibleShipyard.ansible-zookeeper

install zookeeper manually

# install jdk
yum -y install java-1.8.0-openjdk
# download and install zookeeper
tar -zxvf zookeeper-3.4.12.tar.gz —C /opt/
cd /opt/zookeeper-3.4.12
# create zoo.cfg
cd /opt/zookeeper-3.4.12/conf
cp zoo_sample.cfg zoo.cfg
vi zoo.cfg

tickTime=2000
dataDir=/var/lib/zookeeper
dataLogDir=/var/log/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
maxClientCnxns=60

server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

# create directory
mkdir /var/lib/zookeeper
mkdir /var/log/zookeeper
# create myid file
cd /var/lib/zookeeper/

echo 1 > myid
echo 2 > myid
echo 3 > myid

# start
cd /opt/zookeeper-3.4.12/bin
./zkServer.sh start
# check
./zkServer.sh status
# create znode
./zkCli.sh -server 127.0.0.1:2181
create /codis codis
ls /

Zookeeper Configuration

Platform: RHEL / CentOS 7

Java: Oracle JDK

Variables

zookeeper_version: 3.4.12
zookeeper_group: zookeeper
zookeeper_user: zookeeper
zookeeper_dir: /opt/zookeeper-{{zookeeper_version}} # or /usr/share/zookeeper
zookeeper_conf_dir: {{zookeeper_dir}} # or /etc/zookeeper
zookeeper_tarball_dir: /opt/src
data_dir: /var/lib/zookeeper
log_dir: /var/log/zookeeper
zookeeper_client_port: 2181
zookeeper_id: 1
zookeeper_leader_port: 2888
zookeeper_election_port: 3888
Default Ports
Port Description
2181 Client connection port
2888 Quorum port for clustering
3888 Leader election port for clustering
conf/zoo.cfg
tickTime=2000
dataDir=/var/lib/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

tickTime

the basic time unit in milliseconds used by ZooKeeper. It is used to do heartbeats and the minimum session timeout will be twice the tickTime.

dataDir

the location to store the in-memory database snapshots and, unless specified otherwise, the transaction log of updates to the database.

clientPort

the port to listen for client connections

initLimit

is timeouts ZooKeeper uses to limit the length of time the ZooKeeper servers in quorum have to connect to a leader.

syncLimit

limits how far out of date a server can be from a leader.

In this example, the timeout for initLimit is 5 ticks at 2000 milleseconds a tick, or 10 seconds.


以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

高性能MySQL

高性能MySQL

施瓦茨 (Baron Schwartz)、扎伊采夫 (Peter Zaitsev)、特卡琴科 (Vadim Tkachenko) / 宁海元、周振兴、彭立勋、翟卫祥,刘辉 / 电子工业出版社 / 2013-5-1 / 128.00元

《高性能mysql(第3版)》是mysql 领域的经典之作,拥有广泛的影响力。第3 版更新了大量的内容,不但涵盖了最新mysql 5.5版本的新特性,也讲述了关于固态盘、高可扩展性设计和云计算环境下的数据库相关的新内容,原有的基准测试和性能优化部分也做了大量的扩展和补充。全书共分为16 章和6 个附录,内容涵盖mysql 架构和历史,基准测试和性能剖析,数据库软硬件性能优化,复制、备份和恢复,高可......一起来看看 《高性能MySQL》 这本书的介绍吧!

HTML 压缩/解压工具
HTML 压缩/解压工具

在线压缩/解压 HTML 代码

在线进制转换器
在线进制转换器

各进制数互转换器

XML、JSON 在线转换
XML、JSON 在线转换

在线XML、JSON转换工具