在兩台虛擬機上各裝一個glassfish與測試application

事先放一個測試servlet /test/hello在n1, n2兩台機器上
裝glassfish要先裝java jdk並設環境變數

需要程式:

httpd, mod_proxy, mod_ssl, mod_proxy_balancer

  1. 安裝httpd

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    yum install httpd 
    或http://www.rpmfind.net/找rpm
    安裝完後會在下列路徑找到/etc/httpd
    log在/var/log/httpd/error_log

  2. 到/etc/httpd/modules找找有無mod_proxy, mod_ssl
    沒有的話去http://www.rpmfind.net/找rpm安裝
    注意裝的版本要跟httpd完全一致
    CentOS中通常只會缺mod_ssl

  3. 停止 SELinux
    編輯 /etc/sysconfig/selinux 這個檔案
    將 SELINUX=enforcing 改成 SELINUX=disabled
    執行setenforce 0

  4. 設定mod_proxy
    /etc/httpd/conf.d/中加入mod_proxy.conf
    其中n1是machine1的domain, n2是machine2的domain

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    Listen 9090
    Listen 9191
    NameVirtualHost *:9090
    NameVirtualHost *:9191
    <VirtualHost *:9090>
            ProxyRequests off
            ServerName n1
            <Proxy balancer://mycluster>
                    # WebHead1
                    BalancerMember http://n1:8080
                    # WebHead2
                    BalancerMember http://n2:8080
                    # Security "technically we aren't blocking
                    # anyone but this the place to make those
                    # chages
                    Order Deny,Allow
                    Deny from none
                    Allow from all
                    # Load Balancer Settings
                    # We will be configuring a simple Round
                    # Robin style load balancer.  This means
                    # that all webheads take an equal share of
                    # of the load.
                    ProxySet lbmethod=byrequests
            </Proxy>
            # balancer-manager
            # This tool is built into the mod_proxy_balancer
            # module and will allow you to do some simple
            # modifications to the balanced group via a gui
            # web interface.
            <Location /balancer-manager>
                    SetHandler balancer-manager
                    # I recommend locking this one down to your
                    # your office
                    Order deny,allow
                    Allow from all
            </Location>
            # Point of Balance
            # This setting will allow to explicitly name the
            # the location in the site that we want to be
            # balanced, in this example we will balance "/"
            # or everything in the site.
            ProxyPass /balancer-manager !
            ProxyPass / balancer://mycluster/
    </VirtualHost>
    <VirtualHost *:9191>
            ProxyRequests off
            SSLEngine on
            ServerName n1
            SSLCertificateFile /etc/pki/tls/certs/localhost.crt
            SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
            <Proxy balancer://mycluster>
                    # WebHead1
                    BalancerMember http://n1:8080
                    # WebHead2
                    BalancerMember http://n2:8080
                    # Security "technically we aren't blocking
                    # anyone but this the place to make those
                    # chages
                    Order Deny,Allow
                    Deny from none
                    Allow from all
                    # Load Balancer Settings
                    # We will be configuring a simple Round
                    # Robin style load balancer.  This means
                    # that all webheads take an equal share of
                    # of the load.
                    ProxySet lbmethod=byrequests
            </Proxy>
            # balancer-manager
            # This tool is built into the mod_proxy_balancer
            # module and will allow you to do some simple
            # modifications to the balanced group via a gui
            # web interface.
            <Location /balancer-manager>
                    SetHandler balancer-manager
                    # I recommend locking this one down to your
                    # your office
                    Order deny,allow
                    Allow from all
            </Location>
            # Point of Balance
            # This setting will allow to explicitly name the
            # the location in the site that we want to be
            # balanced, in this example we will balance "/"
            # or everything in the site.
            ProxyPass /balancer-manager !
            ProxyPass / balancer://mycluster/
    </VirtualHost>

  5. 關閉iptables並啟動httpd
    service stop iptalbes
    service start httpd

  6. 將httpd設定為開機即啟動，iptables設定成不要開機啟動
    chkconfig –levels 235 httpd on
    chkconfig iptables off

  7. http://localhost:9090/balancer-manager
    apache proxy_balancer簡單管理頁面

  8. http://n1:9090/test/hello並觀察balancer-manager頁面

  9. 可以將/etc/httpd/conf/httpd.conf的KeepAlive改為On