Linux环境搭建nginx+2个tomcat+2个redis（主从复制）

实现流程图,自己画的图,容易理解。

先来搭建nginx-1.9.11

1.先本地下载nginx,从本地上传nginx-1.9.11.tar.gz到centos服务器上

pscp C:\Users\Administrator\Desktop\linux版本\nginx-1.9.11.tar.gz  root@115.29.144.131:/root

2.解压后得到以下目录

tar -zxvf  nginx-1.9.11.tar.gz

3.安装nginx前,要确保系统安装了g++、gcc、openssl-devel、pcre-devel和zlib-devel软件

yum install gcc-c++yum -y install zlib zlib-devel openssl openssl--devel pcre pcre-devel 

4.检查系统安装的nginx：

find -name nginx

5.删除系统额nginx

yum remove nginx 

6.安装nginx

cd nginx-1.9.11./configure --prefix=/usr/local/nginxmakemake install 

7.启动nginx

#方法1[root@admin nginx-1.9.11]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf#方法2[root@admin nginx-1.9.11]# cd /usr/local/nginx/sbin[root@admin sbin]# ./nginx

8.停止与重启ngxin

停止#查询nginx主进程号ps -ef | grep nginx#停止进程kill -QUIT 主进程号#快速停止kill -TERM 主进程号#强制停止pkill -9 nginx重启[root@admin local]# /usr/local/nginx/sbin/nginx -s reload

nginx安装失败请参考这里

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Centos环境搭建两个tomcat8 请点击这里

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接下来来安装redis

1.本地下载redis3.0.7.tar.gz,上传到linux服务器

pscp C:\Users\Administrator\Desktop\linux版本\redis-3.0.7.tar.gz  root@115.29.144.131:/root

2.编译redis

tar zxvf redis3.0.7.tar.gz,cd redis3.0.7make

make命令执行完成后，会在src目录下生成5个可执行文件，分别是redis-server、redis-cli、redis-benchmark、redis-check-aof、redis-check-dump
作用：

redis-server：Redis服务器的daemon启动程序
redis-cli：Redis命令行操作工具。当然，你也可以用telnet根据其纯文本协议来操作
redis-benchmark：Redis性能测试工具，测试Redis在你的系统及你的配置下的读写性能
redis-check-aof：更新日志检查

redis-check-dump：用于本地数据库检查
3.安装

make PREFIX=/usr/local install

4.配置 Redis

修改redis.conf文件的内容,这里给一个例子

# Redis configuration file example# By default Redis does not run as a daemon. Use 'yes' if you need it.# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.daemonize no# When run as a daemon, Redis write a pid file in /var/run/redis.pid by default.# You can specify a custom pid file location here.#pidfile /var/run/redis.pidpidfile redis.pid# Accept connections on the specified port, default is 6379port 6379# If you want you can bind a single interface, if the bind option is not# specified all the interfaces will listen for connections.## bind 127.0.0.1# Close the connection after a client is idle for N seconds (0 to disable)timeout 300# Set server verbosity to 'debug'# it can be one of:# debug (a lot of information, useful for development/testing)# notice (moderately verbose, what you want in production probably)# warning (only very important / critical messages are logged)loglevel debug# Specify the log file name. Also 'stdout' can be used to force# the demon to log on the standard output. Note that if you use standard# output for logging but daemonize, logs will be sent to /dev/nulllogfile stdout# Set the number of databases. The default database is DB 0, you can select# a different one on a per-connection basis using SELECT <dbid> where# dbid is a number between 0 and 'databases'-1databases 16################################ SNAPSHOTTING ################################### Save the DB on disk:## save <seconds> <changes>## Will save the DB if both the given number of seconds and the given# number of write operations against the DB occurred.## In the example below the behaviour will be to save:# after 900 sec (15 min) if at least 1 key changed# after 300 sec (5 min) if at least 10 keys changed# after 60 sec if at least 10000 keys changedsave 900 1save 300 10save 60 10000# Compress string objects using LZF when dump .rdb databases?# For default that's set to 'yes' as it's almost always a win.# If you want to save some CPU in the saving child set it to 'no' but# the dataset will likely be bigger if you have compressible values or keys.rdbcompression yes# The filename where to dump the DBdbfilename dump.rdb# For default save/load DB in/from the working directory# Note that you must specify a directory not a file name.dir ./################################# REPLICATION ################################## Master-Slave replication. Use slaveof to make a Redis instance a copy of# another Redis server. Note that the configuration is local to the slave# so for example it is possible to configure the slave to save the DB with a# different interval, or to listen to another port, and so on.## slaveof <masterip> <masterport># If the master is password protected (using the "requirepass" configuration# directive below) it is possible to tell the slave to authenticate before# starting the replication synchronization process, otherwise the master will# refuse the slave request.## masterauth <master-password>################################## SECURITY #################################### Require clients to issue AUTH <PASSWORD> before processing any other# commands. This might be useful in environments in which you do not trust# others with access to the host running redis-server.## This should stay commented out for backward compatibility and because most# people do not need auth (e.g. they run their own servers).## requirepass foobared################################### LIMITS ##################################### Set the max number of connected clients at the same time. By default there# is no limit, and it's up to the number of file descriptors the Redis process# is able to open. The special value '0' means no limts.# Once the limit is reached Redis will close all the new connections sending# an error 'max number of clients reached'.## maxclients 128# Don't use more memory than the specified amount of bytes.# When the memory limit is reached Redis will try to remove keys with an# EXPIRE set. It will try to start freeing keys that are going to expire# in little time and preserve keys with a longer time to live.# Redis will also try to remove objects from free lists if possible.## If all this fails, Redis will start to reply with errors to commands# that will use more memory, like SET, LPUSH, and so on, and will continue# to reply to most read-only commands like GET.## WARNING: maxmemory can be a good idea mainly if you want to use Redis as a# 'state' server or cache, not as a real DB. When Redis is used as a real# database the memory usage will grow over the weeks, it will be obvious if# it is going to use too much memory in the long run, and you'll have the time# to upgrade. With maxmemory after the limit is reached you'll start to get# errors for write operations, and this may even lead to DB inconsistency.## maxmemory <bytes>############################## APPEND ONLY MODE ################################ By default Redis asynchronously dumps the dataset on disk. If you can live# with the idea that the latest records will be lost if something like a crash# happens this is the preferred way to run Redis. If instead you care a lot# about your data and don't want to that a single record can get lost you should# enable the append only mode: when this mode is enabled Redis will append# every write operation received in the file appendonly.log. This file will# be read on startup in order to rebuild the full dataset in memory.## Note that you can have both the async dumps and the append only file if you# like (you have to comment the "save" statements above to disable the dumps).# Still if append only mode is enabled Redis will load the data from the# log file at startup ignoring the dump.rdb file.## The name of the append only file is "appendonly.log"## IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append# log file in background when it gets too big.appendonly no# The fsync() call tells the Operating System to actually write data on disk# instead to wait for more data in the output buffer. Some OS will really flush# data on disk, some other OS will just try to do it ASAP.## Redis supports three different modes:## no: don't fsync, just let the OS flush the data when it wants. Faster.# always: fsync after every write to the append only log . Slow, Safest.# everysec: fsync only if one second passed since the last fsync. Compromise.## The default is "always" that's the safer of the options. It's up to you to# understand if you can relax this to "everysec" that will fsync every second# or to "no" that will let the operating system flush the output buffer when# it want, for better performances (but if you can live with the idea of# some data loss consider the default persistence mode that's snapshotting).appendfsync always# appendfsync everysec# appendfsync no############################### ADVANCED CONFIG ################################ Glue small output buffers together in order to send small replies in a# single TCP packet. Uses a bit more CPU but most of the times it is a win# in terms of number of queries per second. Use 'yes' if unsure.#glueoutputbuf yes# Use object sharing. Can save a lot of memory if you have many common# string in your dataset, but performs lookups against the shared objects# pool so it uses more CPU and can be a bit slower. Usually it's a good# idea.## When object sharing is enabled (shareobjects yes) you can use# shareobjectspoolsize to control the size of the pool used in order to try# object sharing. A bigger pool size will lead to better sharing capabilities.# In general you want this value to be at least the double of the number of# very common strings you have in your dataset.## WARNING: object sharing is experimental, don't enable this feature# in production before of Redis 1.0-stable. Still please try this feature in# your development environment so that we can test it better.# shareobjects no# shareobjectspoolsize 1024

5 . 运行redis

redis-server redis.conf

即可在后台启动redis服务，确认运行了之后，可以用redis-benchmark命令测试看看，还可以通过redis-cli命令实际操作一下，比如：
./redis-cli set foo bar
OK
redis-cli get foo
”bar“
6. 关闭redis

./redis-cli shutdown如果端口变化可以指定端口:./redis-cli -p 6380 shutdown

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配置第二个redis作用从redis与主redis保持数据同步

关键在于修改redis.conf这个主配置文件

1.port 6389 修改端口号2.将# slaveof <masterip> <masterport> 改为：slaveof 127.0.0.1 6379

然后继续采用上面的方法启动从redis即可

采用Redis客户端检验了一下,数据果然同步了

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到这里配置redis就结束了

如何完成tomcat8和redis的session同步机制呢？

1.添加下面这4个jar包

点我下载

2.修改tomcat8的context.xml文件,
第一个tomcat8内容如下

<Context>    <WatchedResource>WEB-INF/web.xml</WatchedResource>        <Manager pathname="" />        <Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />        <Manager className="com.radiadesign.catalina.session.RedisSessionManager"                    host="localhost" port="6379" database="0" maxInactiveInterval="60"/></Context>

第2个tomcat8内容如下

<Context>    <WatchedResource>WEB-INF/web.xml</WatchedResource>        <Manager pathname="" />        <Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />        <Manager className="com.radiadesign.catalina.session.RedisSessionManager"                    host="localhost" port="6389" database="0" maxInactiveInterval="60"/></Context>

3.重新分别启动tomcat即可

#关闭shutdown.sh#启动startup.sh