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  • 简单做个负载均衡

    背景: 

    博客是用springboot写的,启动的时候只需要java -jar启动即可,突然想到可以多启动几台,然后用nginx做一个负载均衡,有没有用不说,权当练手了。

    环境:

    springboot写的博客项目,在服务器上启动 4 个实例,端口号分别是 5201、 5202、5203、5204,如下: 

    另外,springboot打包的时候,可以将代码和依赖以及配置文件分开打包, 这样可以直接修改配置文件,而且可以减小应用jar的大小,不用每次修改代码 后都上传依赖包,打包后的目录结构如下: 

    其中blogportal-1.0-SNAPSHOT.jar为项目代码,可以看到只有 1.4M,lib为依赖包目录,resources为配置文件目录,blog.sh是项目启动脚本,执行./blog.sh start即可启动项目。启动脚本从网上找的,之后自己改了一下以配合负载均衡使用,脚本出处暂时找不到了,脚本代码如下:

     1 #!/bin/bash
     2 
     3 env_args="-Xms128m -Xmx128m"
     4 sleeptime=0
     5 arglen=$#
     6 
     7 # get my-blog pid
     8 get_pid(){
     9     pname="`find . -name 'blog*.jar'`"
    10     pname=${pname:3}
    11     # pid=`ps -ef | grep ${pname} | grep -v grep | awk '{print $2}'`
    12     pid=`lsof -i:5201 | awk '{print $2}'`
    13     echo "$pid"
    14 }
    15 
    16 startup(){
    17     pid=$(get_pid)
    18     if [ "$pid" != "" ]
    19     then
    20         echo "Blog already startup!"
    21     else
    22         jar_path=`find . -name 'blog*.jar'`
    23         echo "jarfile=$jar_path"
    24         cmd="java $1 -jar $jar_path > ./blog.out < /dev/null &"
    25         echo "cmd: $cmd"
    26         java $1 -jar ${jar_path} > ./blog.out < /dev/null &
    27         show_log
    28     fi
    29 }
    30 
    31 shut_down(){
    32     pid=$(get_pid)
    33     if [ "$pid" != "" ]
    34     then
    35         kill -9 ${pid}
    36         echo "Blog is stop!"
    37     else
    38         echo "Blog already stop!"
    39     fi
    40 }
    41 
    42 show_log(){
    43     tail -f blog.out
    44 }
    45 
    46 show_help(){
    47     echo -e "
    	欢迎使用Blog"
    48     echo -e "
    Usage: sh blog.sh start|stop|reload|status|log"
    49     exit
    50 }
    51 
    52 show_status(){
    53     pid=$(get_pid)
    54     if [ "$pid" != "" ]
    55     then
    56         echo "Blog is running with pid: $pid"
    57     else
    58         echo "Blog is stop!"
    59     fi
    60 }
    61 
    62 if [ ${arglen} -eq 0 ]
    63  then
    64     show_help
    65 else
    66     if [ "$2" != "" ]
    67     then
    68         env_args="$2"
    69     fi
    70     case "$1" in
    71         "start")
    72             startup "$env_args"
    73             ;;
    74         "stop")
    75             shut_down
    76             ;;
    77         "reload")
    78             echo "reload"
    79             ;;
    80         "status")
    81             show_status
    82             ;;
    83         "log")
    84             show_log
    85             ;;
    86     esac
    87 fi
    blog.sh

    springboot 将代码与依赖和配置文件分开打包

    在pox.xm文件中添加如下内容:

     1 <plugins>
     2         <plugin>
     3             <groupId>org.apache.maven.plugins</groupId>
     4             <artifactId>maven-compiler-plugin</artifactId>
     5             <configuration>
     6                 <source>1.8</source>
     7                 <target>1.8</target>
     8             </configuration>
     9         </plugin>
    10 
    11         <plugin>
    12             <groupId>org.apache.maven.plugins</groupId>
    13             <artifactId>maven-jar-plugin</artifactId>
    14             <configuration>
    15                 <archive>
    16                     <manifest>
    17                         <addClasspath>true</addClasspath>
    18                         <classpathPrefix>lib/</classpathPrefix>
    19                         <useUniqueVersions>false</useUniqueVersions>
    20                         <mainClass>com.skyer.app.Application</mainClass>
    21                     </manifest>
    22                     <manifestEntries>
    23                         <Class-Path>./resources/</Class-Path>
    24                     </manifestEntries>
    25                 </archive>
    26                 <outputDirectory>${project.build.directory}</outputDirectory>
    27             </configuration>
    28         </plugin>
    29 
    30         <plugin>
    31             <groupId>org.apache.maven.plugins</groupId>
    32             <artifactId>maven-dependency-plugin</artifactId>
    33             <executions>
    34                 <execution>
    35                     <id>copy-dependencies</id>
    36                     <phase>package</phase>
    37                     <goals>
    38                         <goal>copy-dependencies</goal>
    39                     </goals>
    40                     <configuration>
    41                         <outputDirectory>
    42                             ${project.build.directory}/lib/
    43                         </outputDirectory>
    44                     </configuration>
    45                 </execution>
    46             </executions>
    47         </plugin>
    48 
    49         <plugin>
    50             <artifactId>maven-resources-plugin</artifactId>
    51             <executions>
    52                 <execution>
    53                     <id>copy-resources</id>
    54                     <phase>package</phase>
    55                     <goals>
    56                         <goal>copy-resources</goal>
    57                     </goals>
    58                     <configuration>
    59                         <resources>
    60                             <resource>
    61                                 <directory>src/main/resources</directory>                             </resource>
    62                             <resource>
    63                                 <directory>src/main/java</directory>
    64                             </resource>
    65                         </resources>
    66                         <outputDirectory>${project.build.directory}/resources</outputDirectory>
    67                     </configuration>
    68                 </execution>
    69             </executions>
    70         </plugin>
    71 
    72         <plugin>
    73     <groupId>org.springframework.boot</groupId>
    74     <artifactId>spring-boot-maven-plugin</artifactId>
    75             <configuration>
    76                 <includes>
    77                     <include>
    78                         <groupId>null</groupId>
    79                         <artifactId>null</artifactId>
    80                     </include>
    81                 </includes>
    82                 <layout>ZIP</layout>
    83                 <addResources>true</addResources>
    84                 <outputDirectory>${project.build.directory}</outputDirectory>
    85             </configuration>
    86             <executions>
    87                 <execution>
    88                     <goals>
    89                         <goal>repackage</goal>
    90                     </goals>
    91                 </execution>
    92             </executions>
    93         </plugin>
    94 </plugins>
    pox.xml

    其中<mainClass>com.skyer.app.Application</mainClass>为项目启动的入口。

    安装nginx

    1. 下载nginx

      http://nginx.org

    2. 上传到服务器,解压,进入nginx根目录

      cd nginx-1.10.2

    3. 创建安装目录

      mkdir /usr/local/nginx

    4. 安装nginx的依赖包

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

    5. 检查并指定安装

      ./configure --prefix=/usr/local/nginx

    6. 预编译

      make

    7. 编译安装 

      make install

    8. 启动

      sbin/nginx

    9. 检查

      ps -ef | grep nginx

    10. 停止
      sbin/nginx -s stop

    配置 nginx

    去到nginx目录cd /usr/local/nginx编辑conf下的ngxin.conf文件,修改http标签下的内容如下,其中timcat_server里边配置启动的 4 台机器以及端口号。

    启动测试

    通过观察日志,可以发现请求随机落在了 4 台机器中的一台,虽然没有感觉 到速度有多大提升,但好歹也巩固了下知识,权当练手。 

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  • 原文地址:https://www.cnblogs.com/Oven5217/p/10138523.html
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