Linux之搭建redis缓存服务器

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Linux之搭建redis缓存服务器(nginx+tomcat+redis+mysql实现session会话共享)

一、redis介绍

redis是一个key-value存储系统。和Memcached类似,它支持存储的value类型相对更多,包括string(字符串)list(链表)set(集合)zset(sorted set --有序集合)hash(哈希类型)memcached一样,为了保证效率,数据都是缓存在内存中。区别的是redis会周期性的把更新的数据写入磁盘或者把修改操作写入追加的记录文件,并且在此基础上实现master-slave(主从)同步。

Redis是一个高性能的key-value数据库。redis的出现,很大程度补偿了memcached这类key/value存储的不足,在部分场合可以对关系数据库起到很好的补充作用。它提供了JavaC/C++C#phpjavascriptPerlObject-CPythonRuby等客户端,使用很方便。

如果简单地比较RedisMemcached的区别,基本上有以下3
1Redis不仅仅支持简单的k/v类型的数据,同时还提供listsetzsethash数据结构的存储。
2Redis支持数据的备份,即master-slave模式的数据备份。
3Redis支持数据的持久化,可以将内存中的数据保持在磁盘中,重启的时候可以再次加载进行使用。

Redis中,并不是所有的数据都一直存储在内存中的。这是和Memcached相比一个最大的区别。Redis只会缓存所有的key的信息,如果Redis发现内存的使用量超过了某一个阀值,将触发swap的操作,Redis根据“swappability = age*log(size_in_memory)”计算出哪些key对应的value需要swap到磁盘。然后再将这些key对应的value持久化到磁盘中,同时在内存中清除。这种特性使得Redis可以保持超过其机器本身内存大小的数据。当然,机器本身的内存必须要能够保持所有的key因为这些数据是不会进行swap操作的。

当从Redis中读取数据的时候,如果读取的key对应的value不在内存中,那么Redis就需要从swap文件中加载相应数据,然后再返回给请求方。

memcachedredis的比较

1网络IO模型

Memcached是多线程,非阻塞IO复用的网络模型,分为监听主线程和worker子线程,监听线程监听网络连接,接受请求后,将连接描述字pipe 传递给worker线程,进行读写IO, 网络层使用libevent封装的事件库,多线程模型可以发挥多核作用。

Redis使用单线程的IO复用模型,自己封装了一个简单的AeEvent事件处理框架,主要实现了epollkqueueselect,对于单纯只有IO操作来说,单线程可以将速度优势发挥到最大,但是Redis也提供了一些简单的计算功能,比如排序、聚合等,对于这些操作,单线程模型实际会严重影响整体吞吐量,CPU计算过程中,整个IO调度都是被阻塞住的。

2内存管理方面

Memcached使用预分配的内存池的方式,使用slab和大小不同的chunk来管理内存,value根据大小选择合适的chunk存储Redis使用现场申请内存的方式来存储数据

3存储方式及其它方面

Memcached基本只支持简单的key-value存储,不支持持久化和复制等功能Rediskey/value之外,还支持list,set,sortedset,hash等众多数据结构

二、如何保持session会话

目前,为了使web能适应大规模的访问,需要实现应用的集群部署。集群最有效的方案就是负载均衡,而实现负载均衡用户一个请求都有可能被分配到不固定的服务器上,这样我们首先要解决session的统一来保证无论用户的请求被转发到哪个服务器上都能保证用户的正常使用,即需要实现session的共享机制。

在集群系统下实现session统一的有如下几种方案:

1、请求精确定位sessionsticky,例如基于访问ip的hash策略,即当前用户的请求都集中定位到一台服务器中,这样单台服务器保存了用户的session登录信息,如果宕机,则等同于单点部署,会丢失会话不复制

2、session复制共享sessionreplication,如tomcat自带session共享主要是指集群环境下,多台应用服务器之间同步session,使session保持一致,对外透明。 如果其中一台服务器发生故障,根据负载均衡的原理,调度器会遍历寻找可用节点,分发请求,由于session已同步,故能保证用户的session信息不会丢失会话复制,

此方案的不足之处:

必须在同一种中间件之间完成(如:tomcat-tomcat之间).

session复制带来的性能损失会快速增加.特别是当session中保存了较大的对象,而且对象变化较快时, 性能下降更加显著会消耗系统性能这种特性使得web应用的水平扩展受到了限制。

Session内容通过广播同步给成员,会造成网络流量瓶颈,即便是内网瓶颈。在大并发下表现并不好

3、基于cache DB缓存的session共享

基于memcache/redis缓存的 session 共享

即使用cacheDB存取session信息,应用服务器接受新请求将session信息保存在cache DB中,当应用服务器发生故障时,调度器会遍历寻找可用节点,分发请求,当应用服务器发现session不在本机内存时,则去cache DB中查找,如果找到则复制到本机,这样实现session共享和高可用。

三、nginx+tomcat+redis实现负载均衡、session共享

1、实验环境

主机

操作系统

IP地址

Nginx

Centos7.2

192.168.31.141

Tomcat-1

192.168.31.83

Tomcat-2

192.168.31.250

Mysql

192.168.31.225

Redis

192.168.31.106

2、实验拓扑

技术分享

在这个图中,nginx做为反向代理,实现静动分离,将客户动态请求根据权重随机分配给tomcat服务器,redis做为tomcat的共享session数据服务器mysql做为两台tomcat的后端数据库。

3nginx安装配置

使用Nginx作为Tomcat的负载平衡器,Tomcat的会话Session数据存储在Redis,能够实现零宕机7x24效果。因为将会话存储在Redis中,因此Nginx就不必配置成stick某个Tomcat方式,这样才能真正实现后台多个Tomcat负载平衡

安装nginx

安装zlib-develpcre-devel等依赖包

[[email protected] ~]# yum -y install gccgcc-c++ make libtoolzlibzlib-develpcrepcre-developensslopenssl-devel

注:

结合proxyupstream模块实现后端web负载均衡

结合nginx默认自带的ngx_http_proxy_module模块 ngx_http_upstream_module模块实现后端服务器的健康检查

创建nginx程序用户

[[email protected] ~]# useradd -s /sbin/nologin www

编译安装nginx

[[email protected] ~]# tar zxf nginx-1.10.2.tar.gz

[[email protected] ~]# cd nginx-1.10.2/

[[email protected] nginx-1.10.2]# ./configure --prefix=/usr/local/nginx1.10 --user=www --group=www --with-http_stub_status_module --with-http_realip_module --with-http_ssl_module --with-http_gzip_static_module  --with-pcre  --with-http_flv_module

[[email protected] nginx-1.10.2]# make&& make install

优化nginx程序的执行路径

[[email protected] nginx-1.10.2]# ln -s /usr/local/nginx1.10/sbin/nginx /usr/local/sbin/

[[email protected] nginx-1.10.2]# nginx -t

nginx: the configuration file /usr/local/nginx1.10/conf/nginx.conf syntax is ok

nginx: configuration file /usr/local/nginx1.10/conf/nginx.conf test is successful

编写nginx服务脚本:脚本内容如下:

[[email protected] ~]# cat /etc/init.d/nginx

#!/bin/bash

# nginx Startup script for the Nginx HTTP Server

# chkconfig: - 85 15

# pidfile: /usr/local/nginx1.10/logs/nginx.pid

# config: /usr/local/nginx1.10/conf/nginx.conf

nginxd=/usr/local/nginx1.10/sbin/nginx

nginx_config=/usr/local/nginx1.10/conf/nginx.conf

nginx_pid=/usr/local/nginx1.10/logs/nginx.pid

RETVAL=0

prog="nginx"

# Source function library.

. /etc/rc.d/init.d/functions

# Start nginx daemons functions.

start() {

if [ -f $nginx_pid ] ; then

echo "nginx already running...."

exit 1

fi

echo -n "Starting $prog: "

   $nginxd -c ${nginx_config}

   RETVAL=$?

[ $RETVAL = 0 ] && touch /var/lock/subsys/nginx

}

# Stop nginx daemons functions.

stop() {

echo -n "Stopping $prog: "

        $nginxd -s stop

        RETVAL=$?

[ $RETVAL = 0 ] &&rm -f /var/lock/subsys/nginx

}

# reloadnginx service functions.

reload() {

echo -n "Reloading $prog: "

    $nginxd -s reload

}

# statusngnx service functions

status() {

if [ -f $nginx_pid ] ; then

echo  "$prog is running"

else

echo  "$prog is stop"

fi

}

case "$1" in

start)

start

        ;;

stop)

stop

        ;;

reload)

reload

        ;;

restart)

stop

start

        ;;

status)

status

        ;;

*)

echo "Usage: $prog {start|stop|restart|reload|status}"

exit 1

        ;;

esac

[[email protected] ~]# chmod +x /etc/init.d/nginx

[[email protected] ~]# chkconfig --add nginx

[[email protected] ~]# chkconfignginx on

[[email protected]www ~]# systemctl daemon-reload

配置nginx反向代理:反向代理+负载均衡+健康探测nginx.conf文件内容:

[[email protected] ~]# cat /usr/local/nginx1.10/conf/nginx.conf

user  wwwwww;

worker_processes  4;

worker_cpu_affinity 0001 0010 0100 1000;

error_log  logs/error.log;

#error_log  logs/error.log  notice;

#error_log  logs/error.log  info;

worker_rlimit_nofile 10240;

pid        logs/nginx.pid;

events {

useepoll;

worker_connections  4096;

}

http {

includemime.types;

default_type  application/octet-stream;

log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘

                      ‘$status $body_bytes_sent "$http_referer" ‘

                      ‘"$http_user_agent" "$http_x_forwarded_for"‘;

access_log  logs/access.log  main;

server_tokens off;

sendfile        on;

tcp_nopush     on;

    #keepalive_timeout  0;

keepalive_timeout  65;

    #Compression Settings

gzip on;

gzip_comp_level 6;

gzip_http_version 1.1;

gzip_proxied any;

gzip_min_length 1k;

gzip_buffers 16 8k;

gzip_types text/plain text/css text/javascript application/json application/javascript application/x-javascript application/xml;

gzip_vary on;

    #end gzip

    # http_proxy Settings

client_max_body_size   10m;

client_body_buffer_size   128k;

proxy_connect_timeout   75;

proxy_send_timeout   75;

proxy_read_timeout   75;

proxy_buffer_size   4k;

proxy_buffers   4 32k;

proxy_busy_buffers_size   64k;

proxy_temp_file_write_size  64k;

    #load balance Settings

upstreambackend_tomcat {

server 192.168.31.83:8080 weight=1 max_fails=2 fail_timeout=10s;

server 192.168.31.250:8080 weight=1 max_fails=2 fail_timeout=10s;

    }

    #virtual host Settings

server {

listen       80;

server_name  www.benet.com;

charset utf-8;

location / {

root html;

index  index.jsp index.html index.htm;

        }

location ~* \.(jsp|do)$ {

proxy_pass  http://backend_tomcat;

proxy_redirect off;

proxy_set_header Host $host;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;

        }

location /nginx_status {

stub_status on;

access_log off;

allow 192.168.31.0/24;

deny all;

        }

    }

}

重启nginx服务,使修改生效

[[email protected] ~]# service  nginx restart

配置防火墙规测

[[email protected] ~]# firewall-cmd --permanent --add-port=80/tcp

success

[[email protected] ~]# firewall-cmd --reload

success

4、安装部署tomcat应用程序服务器

tomcat-1和tomcat-2节点上安装JDK

在安装tomcat之前必须先安装JDK,JDK的全称是java  development kit,是sun公司免费提供的java语言的软件开发工具包,其中包含java虚拟机(JVM),编写好的java源程序经过编译可形成java字节码,只要安装了JDK,就可以利用JVM解释这些字节码文件,从而保证了java的跨平台性。

安装JDK,配置java环境:

jdk-7u65-linux-x64.gz解压

[[email protected] ~]# tar zxf jdk-7u65-linux-x64.gz

将解压的jdk1.7.0_65目录移致动到/usr/local/下并重命名为java

[[email protected] ~]# mv jdk1.7.0_65/ /usr/local/java

/etc/profile文件中添加内容如下:

export JAVA_HOME=/usr/local/java

export PATH=$JAVA_HOME/bin:$PATH

通过source命令执行profile文件,使其生效。

[[email protected] ~]# source /etc/profile

[[email protected] ~]# echo $PATH

/usr/local/java/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

按照相同方法在tomcat-2也安装JDK

分别在tomcat-1和tomcat-2节点运行java  -version命令查看java版本是否和之前安装的一致。

[[email protected] ~]# java -version

java version "1.7.0_65"

Java(TM) SE Runtime Environment (build 1.7.0_65-b17)

Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

至此java环境已经配置完成

tomcat-1和tomcat-2节点安装配置tomcat

解压apache-tomcat-7.0.54.tar.gz

[[email protected] ~]# tar zxf apache-tomcat-7.0.54.tar.gz

将解压生成的文件夹移动到/usr/local/下,并改名为tomcat7

[[email protected] ~]# mv apache-tomcat-7.0.54 /usr/local/tomcat7

配置tomcat环境变量

/etc/profile文件内容如下:

export JAVA_HOME=/usr/local/java

export CATALINA_HOME=/usr/local/tomcat7

export PATH=$JAVA_HOME/bin:$CATALINA_HOME/bin:$PATH

通过source命令执行profile文件,使其生效。

[[email protected] ~]# source /etc/profile

[[email protected] ~]# echo $PATH

/usr/local/java/bin:/usr/local/tomcat7/bin:/usr/local/java/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

查看tomcat的版本信息

[[email protected] ~]# catalina.sh version

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Server version: Apache Tomcat/7.0.54

Server built:   May 19 2014 10:26:15

Server number:  7.0.54.0

OS Name:        Linux

OS Version:     3.10.0-327.el7.x86_64

Architecture:   amd64

JVM Version:    1.7.0_65-b17

JVM Vendor:     Oracle Corporation

启动tomcat

[[email protected] ~]# /usr/local/tomcat7/bin/startup.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Tomcat started.

Tomcat默认运行在8080端口,运行netstat命令查看8080端口监听的信息

[[email protected] ~]# netstat -anpt | grep java

tcp6       0      0 :::8009      :::*                    LISTEN      42330/java          

tcp6       0      0 :::8080      :::*                    LISTEN      42330/java

防火墙规则配置:

[[email protected] ~]# firewall-cmd --permanent --add-port=8080/tcp

success

[[email protected] ~]# firewall-cmd --reload

success

按照相同方法在tomcat-2也安装

打开浏览器分别对tomcat-1和tomcat-2访问测试

技术分享

如果想关闭tomcat则运行/usr/local/tomcat7/bin/shutdown.sh命令

好了,大家可以看到访成功。说明我们的tomcat安装完成,下面我们来修改配置文件

[[email protected] ~]# vim /usr/local/tomcat7/conf/server.xml

设置默认虚拟主机,并增加jvmRoute

<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat-1">

修改默认虚拟主机,并将网站文件路径指向/web/webapp1,在host段增加context段

<Host name="localhost"  appBase="webapps"

unpackWARs="true" autoDeploy="true">

<Context docBase="/web/webapp1" path="" reloadable="true"/>

</Host>

增加文档目录与测试文件

[[email protected] ~]# mkdir -p /web/webapp1

[[email protected] ~]# cd /web/webapp1/

[[email protected] tomcat-1 webapp1]# viindex.jsp

index.jsp内容如下:

<%@page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<html>

<head>

<title>tomcat-1</title>

</head>

<body>

<h1><font color="red">Session serviced by tomcat</font></h1>

<table aligh="center" border="1">

<tr>

<td>Session ID</td>

<td><%=session.getId() %></td>

<% session.setAttribute("abc","abc");%>

</tr>

<tr>

<td>Created on</td>

<td><%= session.getCreationTime() %></td>

</tr>

</table>

</body>

<html>

停止tomcat运行,检查配置文件并启动tomcat

[[email protected] ~]# shutdown.sh

[[email protected] ~]# netstat -anpt | grep java

[[email protected] ~]# catalina.shconfigtest

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Nov 16, 2016 1:04:05 AM org.apache.catalina.core.AprLifecycleListenerinit

INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib

Nov 16, 2016 1:04:05 AM org.apache.coyote.AbstractProtocolinit

INFO: Initializing ProtocolHandler ["http-bio-8080"]

Nov 16, 2016 1:04:05 AM org.apache.coyote.AbstractProtocolinit

INFO: Initializing ProtocolHandler ["ajp-bio-8009"]

Nov 16, 2016 1:04:05 AM org.apache.catalina.startup.Catalina load

INFO: Initialization processed in 534 ms

[[email protected] ~]# startup.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Tomcat started.

[[email protected] ~]# netstat -anpt | grep java

tcp6       0      0 :::8009    :::*                    LISTEN      8180/java           

tcp6       0      0 :::8080    :::*                    LISTEN      8180/java

Tomcat-2节点与tomcat-1节点配置基本类似,只是jvmRoute不同,另外为了区分由哪个节点提供访问,测试页标题也不同(生产环境两个tomcat服务器提供的网页内容是相同的)。其他的配置都相同。

用浏览器访问nginx主机,验证负载均衡

第一次访问的结果

技术分享

第二次访问的结果

技术分享

验证健康检查的方法可以关掉一台tomcat主机,用客户端浏览器测试访问。

从上面的结果能看出两次访问,nginx把访问请求分别分发给了后端的tomcat-1和tomcat-2,客户端的访问请求实现了负载均衡,但sessionid并一样。所以,到这里我们准备工作就全部完成了,下面我们来配置tomcat通过redis实现会话保持。

5、安装redis

下载redis源码,并进行相关操作,如下:

wget http://download.redis.io/releases/redis-3.2.3.tar.gz

解压安装redis

[[email protected] ~]# tar zxf redis-3.2.3.tar.gz

解压完毕后,现在开始安装,如下:

[[email protected] ~]# cd redis-3.2.3/

[[email protected] redis-3.2.3]# make&& make install

技术分享

技术分享

通过上图,我们可以很容易的看出,redis安装到/usr/local,/usr/local/bin,/usr/local/share,/usr/local/include,/usr/local/lib,/usr/local/share/man目录下。

然后再切换到utils目录下,执行redis初始化脚本install_server.sh,如下:

[[email protected] redis-3.2.3]# cdutils/

[[email protected]]# ./install_server.sh

Welcome to the redis service installer

This script will help you easily set up a running redis server

 

Please select the redis port for this instance: [6379]

Selecting default: 6379

Please select the redisconfig file name [/etc/redis/6379.conf]

Selected default - /etc/redis/6379.conf

Please select the redis log file name [/var/log/redis_6379.log]

Selected default - /var/log/redis_6379.log

Please select the data directory for this instance [/var/lib/redis/6379]

Selected default - /var/lib/redis/6379

Please select the redis executable path [/usr/local/bin/redis-server]

Selected config:

Port           : 6379

Config file    : /etc/redis/6379.conf

Log file       : /var/log/redis_6379.log

Data dir       : /var/lib/redis/6379

Executable     : /usr/local/bin/redis-server

CliExecutable : /usr/local/bin/redis-cli

Is this ok? Then press ENTER to go on or Ctrl-C to abort.

Copied /tmp/6379.conf => /etc/init.d/redis_6379

Installing service...

Successfully added to chkconfig!

Successfully added to runlevels 345!

Starting Redis server...

Installation successful!

通过上面的安装过程,我们可以看出redis初始化后redis配置文件为/etc/redis/6379.conf,日志文件为/var/log/redis_6379.log,数据文件dump.rdb存放到/var/lib/redis/6379目录下,启动脚本为/etc/init.d/redis_6379

现在我们要使用systemd,所以在 /etc/systems/system 下创建一个单位文件名字为 redis_6379.service

[[email protected]]# vi /etc/systemd/system/redis_6379.service

内容如下:

[Unit]

Description=Redis on port 6379

[Service]

Type=forking

ExecStart=/etc/init.d/redis_6379 start

ExecStop=/etc/init.d/redis_6379 stop

[Install]

WantedBy=multi-user.target

注:这里Type=forking是后台运行的形式

启动redis

[[email protected]]# systemctl daemon-reload

[[email protected]]# systemctl enable redis_6379.service

[[email protected]]# systemctl start redis_6379.service

[[email protected]]# systemctl status redis_6379.service

redis_6379.service - Redis on port 6379

   Loaded: loaded (/etc/systemd/system/redis_6379.service; enabled; vendor preset: disabled)

   Active: active (running) since Wed 2016-11-16 21:07:26 CST; 4min 25s ago

  Process: 7732 ExecStart=/etc/init.d/redis_6379 start (code=exited, status=0/SUCCESS)

 Main PID: 7734 (redis-server)

CGroup: /system.slice/redis_6379.service

└─7734 /usr/local/bin/redis-server 127.0.0.1:6379

 

Nov 16 21:07:26 redissystemd[1]: Starting Redis on port 6379...

Nov 16 21:07:26 redis redis_6379[7732]: Starting Redis server...

Nov 16 21:07:26 redissystemd[1]: Started Redis on port 6379.

[[email protected]]# netstat -anpt | grep 6379

tcp        0      0 127.0.0.1:6379     0.0.0.0:*     LISTEN      7734/redis-server 1

从显示结果可以看到redis默认监听的是127.0.0.16379端口

防火墙规则设置

[[email protected]]# firewall-cmd --permanent --add-port=6379/tcp

success

[[email protected]]# firewall-cmd --reload

success

现在来查看redis版本使用redis-cli –version命令,如下

[[email protected]]# redis-cli --version

redis-cli 3.2.3

通过显示结果,我们可以看到redis版本是3.2.3

到此源码方式安装redis就介绍完毕。

redis安装完毕之后,我们再来配置redis

设置redis监听的地址,添加监听redis主机的ip

考虑到安全性,我们需要启用redis的密码验证功能requirepass参数

最终redis配置文件如下:

[[email protected] ~]# grep -Ev ‘^#|^$‘ /etc/redis/6379.conf

bind 127.0.0.1 192.168.31.106

protected-mode yes

port 6379

tcp-backlog 511

timeout 0

tcp-keepalive 300

daemonize yes

supervised no

pidfile /var/run/redis_6379.pid

loglevel notice

logfile /var/log/redis_6379.log

databases 16

save 900 1

save 300 10

save 60 10000

stop-writes-on-bgsave-error yes

rdbcompression yes

rdbchecksum yes

dbfilenamedump.rdb

dir /var/lib/redis/6379

slave-serve-stale-data yes

slave-read-only yes

repl-diskless-sync no

repl-diskless-sync-delay 5

repl-disable-tcp-nodelay no

slave-priority 100

requirepass [email protected]

appendonly no

appendfilename "appendonly.aof"

appendfsynceverysec

no-appendfsync-on-rewrite no

auto-aof-rewrite-percentage 100

auto-aof-rewrite-min-size 64mb

aof-load-truncated yes

lua-time-limit 5000

slowlog-log-slower-than 10000

slowlog-max-len 128

latency-monitor-threshold 0

notify-keyspace-events ""

hash-max-ziplist-entries 512

hash-max-ziplist-value 64

list-max-ziplist-size -2

list-compress-depth 0

set-max-intset-entries 512

zset-max-ziplist-entries 128

zset-max-ziplist-value 64

hll-sparse-max-bytes 3000

activerehashing yes

client-output-buffer-limit normal 0 0 0

client-output-buffer-limit slave 256mb 64mb 60

client-output-buffer-limitpubsub 32mb 8mb 60

hz 10

aof-rewrite-incremental-fsync yes

重新启动redis服务

[[email protected] ~]# systemctl restart redis_6379.service

[[email protected] ~]# netstat -anpt | grep redis

tcp   0   0 192.168.31.106:6379     0.0.0.0:*   LISTEN      8418/redis-server 1

redis配置文件配置完毕后,我们来启动redis并进行简单的操作。如下:

[[email protected] ~]# redis-cli -h 192.168.31.106 -p 6379 -a [email protected]

192.168.31.106:6379> keys *

(empty list or set)

192.168.31.106:6379> set name lisi

OK

192.168.31.106:6379> get name

"lisi"

192.168.31.106:6379>

说明:

关于redis-cli -h 192.168.31.106 -p 6379 -a [email protected]的参数解释

这条命令是说要连接redis服务器,IP192.168.31.106,端口是6379,密码是[email protected]

keys *是查看redis所有的键值对。

set namelisi添加一个键值name,内容为lisi

get name查看name这个键值的内容。

redis的命令使用暂时我们就介绍这么多

6、配置tomcat session redis同步

下载tomcat-redis-session-manager相应的jar包,主要有三个:

tomcat-redis-session-manage-tomcat7.jar

jedis-2.5.2.jar

commons-pool2-2.2.jar

下载完成后拷贝到$TOMCAT_HOME/lib

[[email protected] ~]# cp tomcat-redis-session-manage-tomcat7.jar jedis-2.5.2.jar commons-pool2-2.2.jar /usr/local/tomcat7/lib/

修改tomcatcontext.xml

[[email protected] ~]# cat /usr/local/tomcat7/conf/context.xml

<?xml version=‘1.0‘ encoding=‘utf-8‘?>

<!--

  Licensed to the Apache Software Foundation (ASF) under one or more

contributor license agreements.  See the NOTICE file distributed with

this work for additional information regarding copyright ownership.

  The ASF licenses this file to You under the Apache License, Version 2.0

  (the "License"); you may not use this file except in compliance with

the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  See the License for the specific language governing permissions and

limitations under the License.

-->

<!-- The contents of this file will be loaded for each web application -->

<Context>

<!-- Default set of monitored resources -->

<WatchedResource>WEB-INF/web.xml</WatchedResource>

<!-- Uncomment this to disable session persistence across Tomcat restarts -->

<!--

<Manager pathname="" />

    -->

<!-- Uncomment this to enable Comet connection tacking (provides events

on session expiration as well as webapp lifecycle) -->

<!--

<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />

    -->

<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />

<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"

host="192.168.31.106"

password="[email protected]"

port="6379"

database="0"

maxInactiveInterval="60" />

</Context>

重启tomcat服务

说明:

maxInactiveInterval="60"session的失效时间

[[email protected] ~]# shutdown.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

[[email protected] ~]# startup.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Tomcat started.

tomcat-2执行和tomcat-1相同的操作

通过浏览器访问http://192.168.31.141/index.jsp测试页

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刷新页面

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可以看出,分别访问了不同的tomcat,但是得到的session却是相同的,说明达到了集群的目的。

注:Tomcat6开始默认开启了Session持久化设置,测试时可以关闭本地Session持久化,其实也很简单,在Tomcatconf目录下的context.xml文件中,取消注释下面那段配置即可:

修改前:

<!-- Uncomment this to disable session persistence across Tomcat restarts -->

<!--

<Manager pathname="" />

-->

修改后:

<!-- Uncomment this to disable session persistence across Tomcat restarts -->

<Manager pathname="" />

重启tomcat服务

查看redis:

[[email protected] ~]# redis-cli -h 192.168.31.106 -p 6379 -a [email protected]

192.168.31.106:6379> keys *

1) "6C3F950BE6413AD2E0EF00F930881224.tomcat-1.tomcat-1"

2) "name"

3) "7A6D5D4C5B1EA52C4E9EED1C5523FEB5.tomcat-2.tomcat-2"

4) "32C35EEA064884F065E93CB00C690662.tomcat-1.tomcat-1"

7tomcat连接数据库

192.168.31.225作为mysql数据库服务器

[[email protected] ~]# mysql -uroot -p123.abc

mysql> grant all on *.* to [email protected]‘192.168.31.%‘ identified by ‘javapasswd‘;

Query OK, 0 rows affected, 1 warning (0.02 sec)

 

mysql> create database javatest;

Query OK, 1 row affected (0.01 sec)

 

mysql> use javatest;

Database changed

 

mysql> create table testdata(id int not null auto_increment primary key,foo varchar(25),bar int);

Query OK, 0 rows affected (0.02 sec)

 

插入些数据

mysql> insert into testdata(foo,bar) values (‘hello‘,‘123456‘),(‘ok‘,‘654321‘);

Query OK, 2 rows affected (0.04 sec)

Records: 2  Duplicates: 0  Warnings: 0

mysql> select * from testdata;

+----+-------+--------+

| id | foo   | bar    |

+----+-------+--------+

|  1 | hello | 123456 |

|  2 | ok    | 654321 |

+----+-------+--------+

2 rows in set (0.00 sec)

mysql防火墙配置

配置tomcat服务器连接mysql数据库

下载mysql-connector-java-5.1.22-bin.jar并复制到$CATALINA_HOME/lib目录下

[[email protected] ~]# cp mysql-connector-java-5.1.22-bin.jar /usr/local/tomcat7/lib/

[[email protected] ~]# ls /usr/local/tomcat7/lib/mysql-connector-java-5.1.22-bin.jar

/usr/local/tomcat7/lib/mysql-connector-java-5.1.22-bin.jar

 

context configuration

configure the JNDI datasource in tomcat by adding a declaration for your resource to your context

[[email protected] ~]# vi /usr/local/tomcat7/conf/context.xml

<Context>中添加如下内容:

<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"

maxActive="100" maxIdle="30" maxWait="10000"

username="javauser" password="javapass" driverClassName="com.mysql.jdbc.Driver"

url="jdbc:mysql://192.168.31.225:3306/javatest"/>

保存修改并退出

web.xml configuration

[[email protected] ~]# mkdir /web/webapp1/WEB-INF

[[email protected] ~]# vi /web/webapp1/WEB-INF/web.xml

添加内容如下:

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

<description>MySQL Test App</description>

<resource-ref>

<description>DB Connection</description>

<res-ref-name>jdbc/TestDB</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

</web-app>

保存修改并退出,重启tomcat服务

[[email protected] ~]# shutdown.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

[[email protected] ~]# startup.sh

Using CATALINA_BASE:   /usr/local/tomcat7

Using CATALINA_HOME:   /usr/local/tomcat7

Using CATALINA_TMPDIR: /usr/local/tomcat7/temp

Using JRE_HOME:        /usr/local/java

Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

Tomcat started.

tomcat-2进行和tomcat-1相同的操用

Test code

Now create a simple test.jsp page,内容如下:

[[email protected] ~]# vi /web/webapp1/test.jsp

[[email protected] webapp1]# cattest.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="GB2312"%>

<html>

<head>

<title>MySQL</title>

</head>

<body>

connect MySQL<br>

<%

String driverClass="com.mysql.jdbc.Driver";

String url="jdbc:mysql://192.168.31.225:3306/javatest";

String username = "javauser";

String password = "javapasswd";

Class.forName(driverClass);

Connection conn=DriverManager.getConnection(url, username, password);

Statement stmt=conn.createStatement();

ResultSetrs = stmt.executeQuery("select * from testdata");

while(rs.next()){

out.println("<br>foo:"+rs.getString(2)+"bar:"+rs.getString(3));

}

rs.close();

stmt.close();

conn.close();

%>

</body></html>

通过浏览器访问http://192.168.31.141/test.jsp测试页


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注:

以上配置可以参考tomcat docs

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本文出自 “duyuheng” 博客,谢绝转载!

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