Nginx实现后端多台Tomcat的负载均衡调度

Posted 2022-04-21 njsummer

4.1 环境及主机

IP	主机名	角色	软件
172.16.0.8	nginx08.shone.cn	反向代理调度	nginx
172.16.0.18	T18.shone.cn	Tomcat 主机18	JDK、Tomcat
172.16.0.28	T28.shone.cn	Tomcat 主机28	JDK、Tomcat

# 因为在反向代理调度服务器上对后端得Tomcat主机是通过域名方式定义的，所以需要做好DNS域名解析，直接在hosts文件内定义
vim /etc/hosts
172.16.0.8   nginx08.shone.cn    nginx08
172.16.0.18  T18.shone.cn    T18
172.16.0.28  T28.shone.cn    T28

4.2 后端两台 Tomcat 主机配置

[root@CentOS84-IP172-18 ]#hostnamectl set-hostname T18.shone.cn
[root@CentOS84-IP172-18 ]#exit
[root@T18 ]#cat xjzth.sh 
#!/bin/bash
timedatectl set-timezone Asia/Shanghai
sed -i s/pool 2.centos.pool.ntp.org iburst/server ntp1.aliyun.com iburst/g /etc/chrony.conf
systemctl enable --now  chronyd.service
systemctl restart  chronyd.service
date
[root@T18 ]#
[root@T18 ]#bash xjzth.sh 

[root@T18 ]#rz
rz waiting to receive.
Starting zmodem transfer.  Press Ctrl+C to cancel.
Transferring apache-tomcat-10.0.20.tar.gz...
  100%   11636 KB    1057 KB/sec    00:00:11       0 Errors  
Transferring install_tomcat2022.sh...
  100%       3 KB       3 KB/sec    00:00:01       0 Errors  
Transferring jdk-11.0.14_linux-x64_bin.tar.gz...
  100%  164726 KB     397 KB/sec    00:06:54       0 Errors  

[root@T18 ]#ll
-rw-r--r--  1 root root  11915655 Apr  8 20:53 apache-tomcat-10.0.20.tar.gz
-rw-r--r--  1 root root      3111 Apr  9 05:44 install_tomcat2022.sh
-rw-r--r--  1 root root 168679847 Apr  8 22:27 jdk-11.0.14_linux-x64_bin.tar.gz

[root@T18 ]#cat install_tomcat2022.sh 
#!/bin/bash
#
#******************************************************************<strong>
#Author:                wangxiaochun
#QQ:                    29308620
#Date:                  2021-03-15
#FileName：             install_tomcat.sh
#URL:                   http://www.wangxiaochun.com
#Description：          The test script
#Copyright (C):         2021 All rights reserved
#</strong>******************************************************************

DIR=`pwd`
JDK_FILE="jdk-11.0.14_linux-x64_bin.tar.gz"
TOMCAT_FILE="apache-tomcat-10.0.20.tar.gz"
JDK_DIR="/usr/local"
TOMCAT_DIR="/usr/local"

color () 
    RES_COL=60
    MOVE_TO_COL="echo -en \\\\033[$RES_COLG"
    SETCOLOR_SUCCESS="echo -en \\\\033[1;32m"
    SETCOLOR_FAILURE="echo -en \\\\033[1;31m"
    SETCOLOR_WARNING="echo -en \\\\033[1;33m"
    SETCOLOR_NORMAL="echo -en \\E[0m"
    echo -n "$2" && $MOVE_TO_COL
    echo -n "["
    if [ $1 = "success" -o $1 = "0" ] ;then
        $SETCOLOR_SUCCESS
        echo -n $"  OK  "    
    elif [ $1 = "failure" -o $1 = "1"  ] ;then
        $SETCOLOR_FAILURE
        echo -n $"FAILED"
    else
        $SETCOLOR_WARNING
        echo -n $"WARNING"
    fi
    $SETCOLOR_NORMAL
    echo -n "]"
    echo                                                                                                                              




install_jdk()
if !  [  -f "$DIR/$JDK_FILE" ];then
    color 1 "$JDK_FILE 文件不存在" 
    exit; 
elif [ -d $JDK_DIR/jdk ];then
    color 1  "JDK 已经安装" 
    exit
else 
    [ -d "$JDK_DIR" ] || mkdir -pv $JDK_DIR
fi
tar xvf $DIR/$JDK_FILE  -C $JDK_DIR
cd  $JDK_DIR && ln -s jdk* jdk 

cat >  /etc/profile.d/jdk.sh <<EOF
export JAVA_HOME=$JDK_DIR/jdk
export JRE_HOME=\\$JAVA_HOME/jre
export CLASSPATH=\\$JAVA_HOME/lib/:\\$JRE_HOME/lib/
export PATH=\\$PATH:\\$JAVA_HOME/bin
EOF
.  /etc/profile.d/jdk.sh
java -version && color 0 "JDK 安装完成" ||  color 1  "JDK 安装失败" ; exit; 



install_tomcat()
if ! [ -f "$DIR/$TOMCAT_FILE" ];then
    color 1 "$TOMCAT_FILE 文件不存在" 
    exit; 
elif [ -d $TOMCAT_DIR/tomcat ];then
    color 1 "TOMCAT 已经安装" 
    exit
else 
    [ -d "$TOMCAT_DIR" ] || mkdir -pv $TOMCAT_DIR
fi
tar xf $DIR/$TOMCAT_FILE -C $TOMCAT_DIR
cd  $TOMCAT_DIR && ln -s apache-tomcat-*/  tomcat
echo "PATH=$TOMCAT_DIR/tomcat/bin:"$PATH > /etc/profile.d/tomcat.sh
id tomcat &> /dev/null || useradd -r -s /sbin/nologin tomcat

cat > $TOMCAT_DIR/tomcat/conf/tomcat.conf <<EOF
JAVA_HOME=$JDK_DIR/jdk
EOF

chown -R tomcat.tomcat $TOMCAT_DIR/tomcat/

cat > /lib/systemd/system/tomcat.service  <<EOF
[Unit]
Description=Tomcat
#After=syslog.target network.target remote-fs.target nss-lookup.target
After=syslog.target network.target 

[Service]
Type=forking
EnvironmentFile=$TOMCAT_DIR/tomcat/conf/tomcat.conf
ExecStart=$TOMCAT_DIR/tomcat/bin/startup.sh
ExecStop=$TOMCAT_DIR/tomcat/bin/shutdown.sh
RestartSec=3
PrivateTmp=true
User=tomcat
Group=tomcat

[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable --now tomcat.service &> /dev/null
systemctl is-active tomcat.service &> /dev/null &&  color 0 "TOMCAT 安装完成" ||  color 1 "TOMCAT 安装失败" ; exit; 



install_jdk 
install_tomcat
[root@T18 ]#



[root@T18 ]#bash install_tomcat2022.sh 
.................................
jdk-11.0.14/release
java version "11.0.14" 2022-01-18 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.14+8-LTS-263)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.14+8-LTS-263, mixed mode)
JDK 安装完成                                               [  OK  ]
TOMCAT 安装完成                                            [  OK  ]
[root@T18 ]#

[root@T18 ]#ll /usr/local/tomcat/conf/server.xml 
-rw------- 1 tomcat tomcat 16.负载均衡的配置场景和调度算法

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