Centos7离线搭建高可用的Web集群服务：Keepalived+Nginx+Tomcat

Centos7离线搭建高可用的Web集群服务：Keepalived+Nginx+Tomcat

参考资料：https://blog.csdn.net/apei830/article/details/78685855

环境准备

keepalived-2.0.20.tar.gz

apache-tomcat-8.5.57.tar.gz

nginx-1.18.0.tar.gz

jdk-8u202-linux-x64.tar.gz

虚拟机	IP	说明
Server1	192.168.191.200	Master
Server2	192.168.191.201	Backup

 

 

 

 

安装Jdk

下载并解压文件

tar -zvxf jdk-8u202-linux-x64.tar.gz

编辑/etc/profile文件

vim /etc/profile

配置环境变量

export JAVA_HOME=/usr/local/work/jdk1.8.0_202
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

使配置修改生效

source /etc/profile

关闭防火墙

systemctl stop firewalld.service
systemctl disable firewalld.service

安装Tomcat

下载并解压Tomcat

tar -zxvf apache-tomcat-8.5.57.tar.gz

修改ROOT/index.jsp页面，在页面上加入tomcat的IP地址，并打印出request header中的X-NGINX值，这个值我们将在后面配置NGINX时传入

<div id="asf-box">
    <h1>${pageContext.servletContext.serverInfo}(192.168.191.200)<%=request.getHeader("X-NGINX")%></h1>
</div>

启动tomcat，在浏览器中正确访问http://192.168.191.200:8080/和http://192.168.191.201:8080/

安装Nginx

挂载iso镜像文件，进入Packages目录下

mount /dev/cdrom /media/
cd /media/Packages/

安装gcc g++的依赖库，

rpm -ivh mpfr-3.1.1-4.el7.x86_64.rpm
rpm -ivh libmpc-1.0.1-3.el7.x86_64.rpm
rpm -ivh cpp-4.8.5-39.el7.x86_64.rpm
rpm -ivh kernel-headers-3.10.0-1127.el7.x86_64.rpm
rpm -ivh glibc-headers-2.17-307.el7.1.x86_64.rpm
rpm -ivh glibc-devel-2.17-307.el7.1.x86_64.rpm
rpm -ivh gcc-4.8.5-39.el7.x86_64.rpm
​
rpm -ivh libstdc++-devel-4.8.5-39.el7.x86_64.rpm
rpm -ivh gcc-c++-4.8.5-39.el7.x86_64.rpm

安装pcre依赖库

rpm -ivh pcre-8.32-17.el7.x86_64.rpm
rpm -ivh pcre-devel-8.32-17.el7.x86_64.rpm

安装zlib依赖库

rpm -ivh zlib-1.2.7-18.el7.x86_64.rpm
rpm -ivh zlib-devel-1.2.7-18.el7.x86_64.rpm

安装nginx

tar -zxvf nginx-1.18.0.tar.gz
cd nginx-1.18.0/
./configure --prefix=/usr/local/work/nginx
make
make install

配置nginx反向代理，进入nginx目录

vim conf/nginx.conf

在Master（200）中设置proxy_set_header X-NGINX “NGINX-1”

在Backup（201）中设置proxy_set_header X-NGINX “NGINX-2”

    upstream tomcat {
        server 192.168.191.200:8080 weight=1;
        server 192.168.191.201:8080 weight=1;
    }
    server {
        location / {
            proxy_pass http://tomcat;
            proxy_set_header X-NGINX "NGINX-1";
        }
        #……其他省略
    }

启动Nginx

./sbin/nginx

已经启动则执行reload命令，使配置生效

./sbin/nginx -s reload

浏览器中正确访问http://192.168.191.200/和http://192.168.191.201/

安装Keepalived

安装ssl依赖库

rpm -ivh keyutils-libs-devel-1.5.8-3.el7.x86_64.rpm
rpm -ivh libcom_err-devel-1.42.9-17.el7.x86_64.rpm
rpm -ivh libkadm5-1.15.1-46.el7.x86_64.rpm
rpm -ivh libsepol-devel-2.5-10.el7.x86_64.rpm
rpm -ivh libselinux-devel-2.5-15.el7.x86_64.rpm
rpm -ivh libverto-devel-0.2.5-4.el7.x86_64.rpm
rpm -ivh krb5-devel-1.15.1-46.el7.x86_64.rpm
rpm -ivh openssl-devel-1.0.2k-19.el7.x86_64.rpm

解压Keepalived

tar -zxvf keepalived-2.0.20.tar.gz

安装Keepalived

./configure --prefix=/usr/local/work/keepalived
make && make install

配置Keepalived

mkdir /etc/keepalived
vim /etc/keepalived/keepalived.conf

Master（200）配置

global_defs {
  notification_email {
  }
}
​
vrrp_instance VI_1 {
  state MASTER
  interface ens32
  virtual_router_id 51
  mcast_src_ip 192.168.191.200
  priority 250
  advert_int 1
​
  authentication {
    auth_type PASS
    auth_pass 1111
  }
  virtual_ipaddress {
    192.168.191.10
  }
}

Backup（201）配置

global_defs {
  notification_email {
  }
}
​
vrrp_instance VI_1 {
  state BACKUP
  interface ens32
  virtual_router_id 51
  mcast_src_ip 192.168.191.201
  priority 240
  advert_int 1
​
  authentication {
    auth_type PASS
    auth_pass 1111
  }
  virtual_ipaddress {
    192.168.191.10
  }
}

启动Keepalived服务

systemctl start keepalived.service

浏览器访问http://192.168.191.10