Tomcat LB 负载均衡集群实现
主机说明：
Tomcat1：test.field.com/192.168.88.130
Tomcat2：web1.field.com/192.168.88.131
反向代理负载均衡器nginx：cen7.field.com/192.168.88.132
JDK包：jdk-8u151-linux-i586.tar.gz/jdk-8u151-linux-x64.rpm
Tomcat包：apache-tomcat-8.0.47.tar.gz
一、安装配置Tomcat1
1、安装jdk8
[root@www local]# tar -zxfjdk-8u151-linux-i586.tar.gz -C /usr/local
[root@www local]# ln -sv jdk1.8.0_151 jdk8
"jdk8" ->"jdk1.8.0_151"
[root@www local]# ll
总用量 4
drwxr-xr-x. 8 uucp 143 4096 9月 6 2017 jdk1.8.0_151
lrwxrwxrwx. 1 root root 12 6月 14 14:31 jdk8 -> jdk1.8.0_151
1）、配置环境变量
[root@www ~]# vim /etc/profile.d/java.sh
[root@www ~]# more /etc/profile.d/java.sh
export JAVA_HOME=/usr/local/jdk8
export PATH=$JAVA_HOME/bin:$PATH
[root@www ~]# . /etc/profile.d/java.sh
[root@www java]# java
-bash: /usr/local/java/jdk8/bin/java:/lib/ld-linux.so.2: bad ELF interpreter: 没有那个文件或目录
此处报错：原因是解压安装jdk缺少glibc.i686，rpm包安装无此现象。
[root@www~]# yum install glibc.i686
2）、测试Java
[root@www ~]# java
用法: java [-options] class [args...]
(执行类)
2、Tomcat包安装配置
[root@www ~]# tar -zxf apache-tomcat-8.0.47.tar.gz -C /usr/local
[root@www ~]# cd /usr/local/
[root@www local]# ln -sv apache-tomcat-8.0.47 tomcat
"tomcat" ->"apache-tomcat-8.0.47"
[root@www local]# ll | grep tomcat
drwxr-xr-x. 9 root root 4096 11月 16 2017apache-tomcat-8.0.47
lrwxrwxrwx. 1 root root 20 11月 16 2017tomcat -> apache-tomcat-8.0.47
1）、配置环境变量
[root@www local]# vim /etc/profile.d/tomcat.sh
[root@www local]# more /etc/profile.d/tomcat.sh
export CATALINA_HOME=/usr/local/tomcat
export PATH=$CATALINA_HOME/bin:$PATH
[root@field tomcat]# . /etc/profile.d/tomcat.sh
[root@www ~]# cd /usr/local/tomcat/conf
[root@www conf]# cp server.xml{,.backup}
2）、添加Tomcat实例
[root@www conf]# vi server.xml
<Engine name="Catalina"defaultHost="web1.field.com">
</Host>
<Host name="web1.field.com"appBase="/data/webapps" unpackWARs="true"autoDeploy="true">
<Context path="" docBase="ROOT"reloadable="true">
<ValveclassName="org.apache.catalina.valves.RemoteAddrValve"
deny="192\.168\.88\.139" />
</Context>
<ValveclassName="org.apache.catalina.valves.AccessLogValve"directory="/data/log"
prefix="web1_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
3）、创建目录及测试页：
[root@www ~]# mkdir -pv /data/webapps/ROOT/{classes,lib,META-INF,WEB-INF}
[root@www ~]# cd /data/webapps/ROOT/
[root@www ROOT]# vim index.jsp
[root@www ROOT]# more index.jsp
<%@ page language="java" %>
<%@ page import="jave.util.*"%>
<html>
<head>
<title>JSP Test Page</title>
</head>
<body>
<% out.println("Hello,Web1.");%>
</body>
</html>
[root@www conf]# catalina.sh configtest
Tomcat语法检查
[root@www conf]# catalina.sh stop
[root@www conf]# catalina.sh start
4）、测试访问：成功
[root@test jdk1.8.0_151]# curl http://192.168.88.131:8080/index.jsp
<html>
<head>
<title>JSP Test Page</title>
</head>
<body>
Hello,Web1.
</body>
</html>
二、安装配置Tomcat2
1、安装jdk8
[root@test ~]# ll jdk*
-rw-r--r--. 1 root root 192658627 11月 14 21:57 jdk-8u151-linux-i586.tar.gz
-rw-r--r--. 1 root root 174163338 11月 16 20:21 jdk-8u151-linux-x64.rpm
[root@test ~]# # rpm -ivh jdk-8u151-linux-x64.rpm
[root@test ~]# rpm -ql jdk1.8
[root@test ~]# cd /usr/java/
[root@field java]# ll
总用量 4
lrwxrwxrwx. 1 root root 16 11月 16 20:28 default-> /usr/java/latest
drwxr-xr-x. 9 root root 4096 11月 16 20:28jdk1.8.0_151
lrwxrwxrwx. 1 root root 22 11月 16 20:28 latest-> /usr/java/jdk1.8.0_151
1）、修改环境变量
[root@test jdk1.8.0_151]# vim /etc/profile.d/java.sh
export JAVA_HOME=/usr/java/latest
export PATH=$JAVA_HOME/bin:$PATH
[root@test jdk1.8.0_151]# . /etc/profile.d/java.sh
[root@test ~]# java
用法: java [-options] class [args...]
(执行类)
2、Tomcat包安装配置
tomcat2创建两个实例
[root@field ~]# tar zxvfapache-tomcat-8.0.47.tar.gz -C /usr/local
[root@field ~]# cd /usr/local
[root@field local]# ln -sv apache-tomcat-8.0.47 tomcat
"tomcat" ->"apache-tomcat-8.0.47"
[root@field local]# ll tomcat*
lrwxrwxrwx. 1 root root 20 11月 16 20:50 tomcat-> apache-tomcat-8.0.47
drwxr-xr-x. 3 root root 4096 11月 15 12:07tomcat1
drwxr-xr-x. 3 root root 4096 11月 15 12:07tomcat2
1）、配置环境变量
[root@field tomcat]# vim /etc/profile.d/tomcat.sh
export CATALINA_HOME=/usr/local/tomcat
export PATH=$CATALINA_HOME/bin:$PATH
[root@field tomcat]# . /etc/profile.d/tomcat.sh
2）、添加2个Tomcat实例
<Engine name="Catalina"defaultHost="test.field.com">
</Host>
<Host name="test.field.com"appBase="/data/webapps" unpackWARs="true"autoDeploy="false">
<Context path="" docBase="ROOT"reloadable="true" />
<Context path="/app1"docBase="/data/webapps/app1" reloadable="true" />
<ValveclassName="org.apache.catalina.valves.AccessLogValve"directory="/data/log"
prefix="test_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
3）、创建目录和测试页
[root@test webapps]# mkdir -pv /data/webapps/ROOT/{classes,lib,META-INF,WEB-INF}
[root@test webapps]# mkdir -pv /data/webapps/app1/{classes,lib,META-INF,WEB-INF}
[root@test app1]# more index.jsp
<%@ page language="java" %>
<%@ page import="jave.util.*"%>
<html>
<head>
<title>JSP Test Page ForApp1</title>
</head>
<body>
<% out.println("Hello, App1");%>
</body>
</html>
[root@test app1]# more ../ROOT/index.jsp
<%@ page language="java" %>
<%@ page import="jave.util.*"%>
<html>
<head>
<title>JSP Test Page ForTest</title>
</head>
<body>
<% out.println("Hello,Test ");%>
</body>
</html>
[root@test app1]# catalina.sh configtest
[root@test app1]# catalina.sh stop
[root@test app1]# catalina.sh start
4）、测试：成功
[root@www ROOT]# curl test.field.com:8080/index.jsp
<html>
<head>
<title>JSP Test Page ForTest</title>
</head>
<body>
Hello,Test
</body>
</html>
[root@www ROOT]# curl test.field.com:8080/app1/index.jsp
<html>
<head>
<title>JSP Test Page ForApp1</title>
</head>
<body>
Hello,App1
</body>
</html>
三、Centos7安装Nginx
[root@cen7 etc]# yum -y install nginx
1）、配置反向代理和负载均衡
[root@cen7 nginx]# vim nginx.conf
upstream tomsrv {
server web1.field.com:8080;
server test.field.com:8080;
}
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
root /usr/share/nginx/html;
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location /app1/ {
proxy_pass http://test.field.com:8080/app1/index.jsp;
}
location / {
root /usr/share/nginx/html;
index index.html index.phpindex.htm;
}
location ~* \.(jsp|do)$ {
proxy_pass http://tomsrv;
}
2）、访问异常解决
[root@test conf]# curl http://192.168.88.132/index.jsp
curl: (7) couldn't connect to host
[root@test conf]# curl http://192.168.88.132
curl: (7) couldn't connect to host
[root@cen7 etc]# curl localhost
curl: (7) Failed connectto localhost:80; 拒绝连接
核查原因为centos7默认开启了firewall，关闭即可
[root@cen7 nginx]# firewall-cmd --state
running
[root@cen7 nginx]# firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: ens33
sources:
services: ssh dhcpv6-client
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
[root@cen7 nginx]# systemctl stop firewalld
[root@cen7 etc]# systemctl stop firewalld
四、测试负载均衡和反向代理Tomcat集群
成功：
[root@test conf.d]# curl http://192.168.88.132/index.jsp
<html>
<head>
<title>JSP Test Page</title>
</head>
<body>
Hello,Web1.
</body>
</html>
[root@test conf.d]# curl http://192.168.88.132/index.jsp
<html>
<head>
<title>JSP Test Page ForTest</title>
</head>
<body>
Hello,Test
</body>
</html>
[root@test conf.d]# curl http://192.168.88.132/app1/
<html>
<head>
<title>JSP Test Page ForApp1</title>
</head>
<body>
Hello, App1
</body>
</html>