评价：其实是一个整合型的方案，从它的安装页面看：http://getkong.org/download/#other
该方案基于OpenResty，和lua
提供的功能是统一的Oauth认证、rest封装好了之后的流控、API添加能力，在此基础上其实也可以对整个集群做流量切、日志等功能，总得来说是对nginx一个更优秀的封装，使得其更便于操作。
缺点是，方案还是较新，没有webadmin的界面
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1、下载
http://getkong.org/download/#centos
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2、安装kong
$ sudo yum install epel-release
$ sudo yum install kong-0.2.0_2.*.noarch.rpm --nogpgcheck
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3、手动安装
wget https://github.com/Mashape/kong/releases/download/0.2.0-2/kong-0.2.0_2.el7.noarch.rpm
yum install nc
yum install openssl098e
rpm -i kong-0.2.0_2.el7.noarch.rpm
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4、安装卡桑德拉
1、下载
wget http://apache.fayea.com/cassandra/2.1.5/apache-cassandra-2.1.5-bin.tar.gz
tar zxvf apache-cassandra-2.1.5-bin.tar.gz
mv apache-cassandra-2.1.5 /opt/cassandra
vim /etc/profile
export CASSANDRA_HOME=/opt/cassandra
export PATH=$PATH:$CASSANDRA_HOME/bin
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2、安装JAVA
2.1 安装JDK
wget http://119.254.108.84:8080/jdk.tar.gz
tar zxvf jdk.tar.gz
sudo update-alternatives --install /usr/bin/java java /opt/jdk/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /opt/jdk/bin/jar 300
sudo update-alternatives --config java
vim /etc/profile
export JAVA_HOME=/opt/jdk
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
-----------------------------------------------
2.2 安装maven
wget http://mirrors.cnnic.cn/apache/maven/maven-3/3.2.3/binaries/apache-maven-3.2.3-bin.tar.gz
tar zxvf apache-maven-3.2.3-bin.tar.gz
mv apache-maven-3.2.3-bin /opt/maven
vim /etc/profile
export M2_HOME=/opt/maven
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
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3、启动
bin/cassandra -f
前台启动
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4、启动shell
./cqlsh
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 2.1.2 | CQL spec 3.2.0 | Native protocol v3]
Use HELP for help.
cqlsh>
监听在9042端口
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5、CQL查询语言
http://cassandra.apache.org/doc/cql3/CQL.html
2与3之间貌似不兼容
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参考文档：http://wiki.apache.org/cassandra/GettingStarted
6、开始一个简单的例子
建立键空间：
CREATE KEYSPACE mykeyspace
WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
-----------------------------------------------
使用键空间：
USE mykeyspace;
-----------------------------------------------
建立users表：
CREATE TABLE users (
user_id int PRIMARY KEY,
fname text,
lname text
);
-----------------------------------------------
插入数据：
INSERT INTO users (user_id, fname, lname)
VALUES (1745, 'john', 'smith');
INSERT INTO users (user_id, fname, lname)
VALUES (1744, 'john', 'doe');
INSERT INTO users (user_id, fname, lname)
VALUES (1746, 'john', 'smith');
-----------------------------------------------
查询数据：
SELECT * FROM users;
-----------------------------------------------
建立索引并查询：
CREATE INDEX ON users (lname);
SELECT * FROM users WHERE lname = 'smith';
user_id | fname | lname
---------+-------+-------
1745 | john | smith
1746 | john | smith
cassandra有二级索引，所以可以这么做，但是因为是基于HASH的索引，所以要做范围查询的时候这么做是否OK？呢？
再说。。。
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7、客户端问题
http://wiki.apache.org/cassandra/ClientOptions
node.js这边有且只有一个选择，今天是：2014-12-10号，就是官方驱动
项目地址：https://github.com/datastax/nodejs-driver
示例工程位置：ssh root@119.254.110.72
之后上传到github上去
mkdir node_cassandra
vim package.json
{
"name": "node-cassandra",
"version": "0.0.1",
"description": "sf express",
"dependencies": {
},
"license": "MIT",
"repository": {
"type": "git"
},
"readmeFilename": "Readme.md",
"bugs": {
"url": "https://github.com/visionmedia/co/issues"
},
"homepage": "https://github.com/visionmedia/co"
}
npm install cassandra-driver --save
-----------------------------------------------
客户端提供以下功能：
Node discovery
Configurable load balancing
Transparent failover
Tunability
Paging
Client-to-node SSL support
Row streaming
Prepared statements and query batches
-----------------------------------------------
基础用法：
var cassandra = require('cassandra-driver');
var client = new cassandra.Client({contactPoints: ['host1', 'h2'], keyspace: 'ks1'});
var query = 'SELECT email, last_name FROM user_profiles WHERE key=?';
client.execute(query, ['guy'], function(err, result) {
assert.ifError(err);
console.log('got user profile with email ' + result.rows[0].email);
});
-----------------------------------------------
日志：
client.on('log', function(level, className, message, furtherInfo) {
console.log('log event: %s -- %s', level, message);
});
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8、监控预警
http://sematext.com/spm/
服务很强大，但是。。。。。收费，基于云
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9、生态环境
参考链接：http://wiki.apache.org/cassandra/IntegrationPoints
http://esper.codehaus.org/
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10、硬件配置
内存：4G最小，32G也OK
CPU：8核心
硬盘：最好是2块以上，不包括操作系统本身的那部分
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11、总体评价
功能上，可以提供原生的二级索引，有CQL可用，用户界面相当友好，无中心节点，可配置的一致性级别，非常强健
但是问题在于国内应用较少，HBase也很好用，但是缺少cassandra的不少功能
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12、启动kong
[root@i-v788f9x0 ~]# kong start
[INFO] Using configuration: /etc/kong/kong.yml
[INFO] Proxy port.........8000
Admin API port.....8001
Database...........cassandra keepalive=60000 port=9042 timeout=1000 hosts=127.0.0.1 keyspace=kong
[INFO] Database not initialized. Running migrations...
[OK] Migrated up to: 2015-01-12-175310_init_schema
[OK] Migrated up to: 2015-04-24-154530_plugins
[WARN] ulimit is currently set to "1024". For better performance set it to at least "4096" using "ulimit -n"
[OK] Started
[root@i-v788f9x0 ~]#
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13、校验是否启动
[root@i-v788f9x0 ~]# curl 127.0.0.1:8001
{"version":"0.2.0-2","lua_version":"LuaJIT
2.1.0-alpha","tagline":"Welcome to
Kong","hostname":"i-v788f9x0","plugins":{"enabled_in_cluster":{},"available_on_server":["keyauth","basicauth","ratelimiting","tcplog","udplog","filelog","cors","request_transformer"]}}[root@i-v788f9x0
~]#
[root@i-v788f9x0 ~]#
[root@i-v788f9x0 ~]#
[root@i-v788f9x0 ~]#
[root@i-v788f9x0 ~]#
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14、简单教程
http://getkong.org/docs/0.2.0-2/getting-started/quickstart/
启动:
kong start
端口：
8000是工作端口
8001是配置端口
停止：
kong stop
重载：
kong reload
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15、增加API
http://getkong.org/docs/0.2.0-2/getting-started/adding-your-api/