AWS EC2

第一次接触AWS是在2012年，培养了我对弹性计算，按需收费的认识，觉得很坑，典型的企业型操作界面不实用，果断选择linode。倒是”云计算”从09年炒作，到现在IT才算落地，也算对昔日有所交代。

准备

亚马逊帐号
一张双币信用卡

开拨

Launch EC2 instance
Choose an Amazon Machine Image（选个free的AMI,eg:ubuntu 14.04）
Choose an Instance Type(t2.micro free only)
Configure Instance Details(默认VPC，选个子网，IP Auto Assgin)
Add Storge（root->/dev/sda1->10G，不附加其他卷）
Configure Security Group(ps:all traffic source anywhere )
Edit tag(最好标记下这个实例干什么用的,方便管理，本例ZooKeeper)
Review Instance Launch ->Launch

别忘了生成keypair，实例Launch 成功之后，ssh -i keypair ‘user@pubic ip’

ZooKeeper

Download and install jdk 1.6(jdk6普及率远胜于jdk7)
Download zookeeper 3.4.6

简单粗暴上代码，对于任何技术或者语言的学习，实战胜于千言.

step 1:

#install jdk
cp jdk-6u29-linux-x64.bin /usr/local/
cd /usr/local 
chmod u+x  jdk-6u29-linux-x64.bin
sudo -s ./ jdk-6u29-linux-x64.bin
ln -s jdk1.6.0_29/ jdk

sudo vi /etc/profile

# configure java 
export JAVA_HOME=/usr/local/jdk
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=.:$JAVA_HOME/bin:$PATH

#make it work
sudo source /etc/profile

step 2 ：

#configure zookeeper
wget http://mirrors.gigenet.com/apache/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz
cp zookeeper-3.4.6.tar.gz /usr/local/
cd /usr/local/
tar zxvf zookeeper-3.4.6.tar.gz
ln -s zookeeper-3.4.6/ zookeeper
mkdir -p zookeeper/data/
cp zookeeper/conf/zoo_sample.cfg zookeeper/conf/zoo.cfg
cd zookeeper && ./bin/zkServer.sh start

step 3：test

#......省略log部分
[ec2-user@ip-172-31-23-30 zookeeper]$ bin/zkCli.sh
[zk: localhost:2181(CONNECTED) 0]
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1] create /zk_test atschx
Created /zk_test
[zk: localhost:2181(CONNECTED) 2] get /zk_test
atschx
cZxid = 0x6
ctime = Sat Jan 24 23:28:56 EST 2015
mZxid = 0x6
mtime = Sat Jan 24 23:28:56 EST 2015
pZxid = 0x6
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0
[zk: localhost:2181(CONNECTED) 3] ls /
[zookeeper, zk_test]
[zk: localhost:2181(CONNECTED) 4]

至此，zookeeper单实例安装也就完成了。

Cluster Install ZooKeeper

AWS的优势在这里可谓是表现的淋漓尽致，小伙伴们都惊呆了….

你可以采用 Launch More Like This的方式直接复制配置启动一个新的实例，jdk环境，zookeeper环境需要再按照上面的步骤安装配置一遍。除此之外，也可以采用如图中标注的方式打包你的EC2实例，这个来的痛快。总之，继续下面的步骤之前你要再运行两个EC2实例。

集群配置

IP规划

172.31.23.30
172.31.23.31
172.31.23.32

zoo.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/usr/local/zookeeper/data
# the port at which the clients will connect
clientPort=2181

server.1=172.31.23.30:2888:3888
server.2=172.31.23.31:2888:3888
server.3=172.31.23.32:2888:3888
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

myid

每个server的 /usr/local/zookeeper/data 目录下创建myid文件，写入server的id号.

cd /usr/local/zookeeper/data
touch myid
echo 1 > myid

依次启动zookeeper，测试下吧.

备注：测试完记得stop EC2实例，不要给别人留下扣费的理由。

12年初识亚马逊云时感觉console及其不专业，典型的企业型管理类web系统风格（每曾想它背后所做的事情）。13年购置第一台linode主机后嗷嗷的下载速度为平时工作带来更精彩的便利（youtube&viemo上的技术视频,slideshare技术大拿的分享）。随着2014年google被中国彻底墙掉，linode俨然成了很重要的一个跳板…