Nginx+Redis+Tomcat实现session共享的集群
Nginx 作为目前最流行的开源反向代理HTTP Server，用于实现资源缓存、web server负载均衡等功能，由于其轻量级、高性能、高可靠等特点在互联网项目中有着非常普遍的应用，相关概念网上有丰富的介绍。分布式web server集群部署后需要实现session共享，针
对 tomcat 服务器的实现方案多种多样，比如 tomcat cluster session 广播、nginx IP hash策略、
nginx sticky module等方案，本文主要介绍了使用 redis 服务器进行 session 统一存储管理的共享方案。
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0当机的7×24运营效果。因为
将会话存储 在Redis中，因此Nginx就不必配置成stick粘粘某个Tomcat方式，这样才能真正实现后台多个Tomcat负载平衡，用户请求
能够发往任何 一个tomcat主机，当我们需要部署新应用代码时，只要停止任何一台tomcat，所有当前在线用户都会导向到运行中的tomcat实
例，因为会话数据 被序列化到Redis，在线用户不会受到影响，一旦停掉的tomcat实例上线，另外其他重复部署过程。
http://suzf.net/wp-content/uploads/2016/03/frame-20160121153429_41249.png
实验环境
IP Roles port
node1 192.168.9.10nginx,redis,tomcat80,1111,8080
node2 192.168.9.70tomcat 8080
软件工具包
apache-tomcat-7.0.68.tar
redis-3.0.7.tar
jdk-7u79-linux-x64.rpm
nginx-1.0.15-12.el6.x86_64.rpm
tomcat需要的jar包
commons-logging-1.1.3.jar
commons-pool2-2.2.jar
jedis-2.5.2.jar
tomcat-juli.jar
tomcat-redis-session-manage-tomcat7.jar
安装redis
1. Redis 安装
== Redis 源码安装
— 参照源码 README
— 默认端口 6379
*** 安装redis之前先要确认系统已经安装了GCC和libc库 ***
wget http://download.redis.io/releases/redis-3.0.7.tar.gz
tar xf redis-3.0.7.tar.gz
cd redis-3.0.7
make
# make test
make PREFIX=/usr/local/redis install
== 可执行命令
redis-server Redis服务系统
redis-cli Redis一个客户端管理工具
redis-benchmark 用来检测redis性能
redis-check-aof & redis-check-dump 用来处理损坏的数据文件
redis-sentinel -> redis-server < soft link >
cd utils
./install_server.sh
^_^#bash 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: 1111
Please select the redis config file name
Selected default – /etc/redis/1111.conf
Please select the redis log file name
Selected default – /var/log/redis_1111.log
Please select the data directory for this instance
Selected default – /var/lib/redis/1111
Please select the redis executable path /usr/local/redis/bin/redis-server
Selected config:
Port : 1111
Config file : /etc/redis/1111.conf
Log file : /var/log/redis_1111.log
Data dir : /var/lib/redis/1111
Executable : /usr/local/redis/bin/redis-server
Cli Executable : /usr/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/1111.conf => /etc/init.d/redis_1111
Installing service…
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server…
Installation successful!
Redis 系统配置
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
sysctl vm.overcommit_memory=1
echo 511 > /proc/sys/net/core/somaxconn
启动服务
/etc/init.d/redis_1111 start
配置文件可以用默认的配置，从服务器上配置文文件打开slavefo 加上主服务器的ip和端口，还有其他的参数如日志和dump.rdb保存路径可以适当修改
FAQ:
make时如果有类似如下报错：
Selecting a non-default memory allocator when building Redis is done by setting
the MALLOC environment variable. Redis is compiled and linked against libc
malloc by default, with the exception of jemalloc being the default on Linux
systems. This default was picked because jemalloc has proven to have fewer
fragmentation problems than libc malloc.
make MALLOC=libc
安装 JDK and Tomcat
# wget -c --header "Cookie: oraclelicense=accept-securebackup-cookie" `curl -s http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html | awk -F'"' '/jdk\-7.*\-linux\-x64.rpm/{print $12;exit}'`
# rpm -ivh jdk-7u79-linux-x64.rpm
# cat > /etc/profile.d/java.sh/etc/profile.d/tomcat.sh/etc/profile.d/gradle2.10.sh
#source /etc/profile.d/gradle2.10.sh
安装 tomcat-redis-session-manager
git clone https://github.com/jcoleman/tomcat-redis-session-manager.git
cd tomcat-redis-session-manager/
mv build.gradle build.gradle.bak
vim build.gradle
#diff -ruN build.gradle*
--- build.gradle 2016-01-04 07:07:59.000000000 +0800
+++ build.gradle.old 2016-03-18 10:48:15.620704187 +0800
@@ -44,13 +44,8 @@
archives sourcesJar
}
-//signing {
-//sign configurations.archives
-//}
-
-task copyJars(type: Copy) {
-from configurations.runtime
-into 'dist'
+signing {
+sign configurations.archives
}
uploadArchives {
@@ -58,9 +53,9 @@
mavenDeployer {
beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
- //repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
- //authentication(userName: sonatypeUsername, password: sonatypePassword)
- //}
+ repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
+ authentication(userName: sonatypeUsername, password: sonatypePassword)
+ }
//repository(url: "https://oss.sonatype.org/content/repositories/snapshots") {
//authentication(userName: sonatypeUsername, password: sonatypePassword)
//}
@@ -101,4 +96,4 @@
}
}
}
-}
\ No newline at end of file
+}
# gradle build -x test copyJars
# mkdir /tmp/jar
# cp -a build/libs/*.jar /tmp/jar/ && cp -a dist/*.jar /tmp/jar/
最后将 jar 包 分发到tomcat 项目中
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