JBoss 系列五十：使用Apache httpd(mod_jk)和JBoss構架高可用集羣環境

概述

前面JBoss 系列二：使用Apache httpd(mod_cluster)和JBoss構架高可用集羣環境中咱們介紹了企業應用的目的的目的，負載均衡，容錯等，並經過Apache httpd(mod_cluster)和JBoss構架高可用集羣環境，咱們這裏在原有的環境中將mod_cluster換成mod_jk，其架構以下圖所示：

本方案是在開源Linux操做系統Fedora 15上進行，咱們列出本方案使用的硬件和軟件，三臺物理機器，內存4GB或以上，安裝Fedora 15後IP地址分別爲10.66.192.48，10.66.192.231，10.66.192.232，咱們分別對這三臺物理機器作相應的安裝以下：

• 10.66.192.231 – 安裝JDK 1.6，JBoss 7，JBoss節點名稱爲node1
• 10.66.192.232 – 安裝JDK 1.6，JBoss 7，JBoss節點名稱爲node2
• 10.66.192.48  – 安裝Apache httpd，mod_jk

接下來咱們給出使用Apache httpd(mod_jk)和JBoss構架高可用集羣環境的步驟。

下載mod_jk相關安裝包

從http://tomcat.apache.org/download-connectors.cgi下載mod_jk.so包到本地（注意選擇適合本身操做系統對應httpd的包）。

安裝 Apache httpd

請參照系列一 Apache httpd 安裝（http://blog.csdn.net/kylinsoong/article/details/12291173）

Apache httpd端配置

編輯httpd/conf/httpd.conf，讓httpd監聽在10.66.192.48:80上：

Listen 10.66.192.48:80

拷貝mod_jk.so文件到httpd/modules目錄：

cp mod_jk.so  /etc/httpd/modules

在 httpd/conf.d下建立mod_jk.conf文件，編輯內容以下：

# Load mod_jk module
# Specify the filename of the mod_jk lib
LoadModule jk_module modules/mod_jk.so

# Where to find workers.properties
JkWorkersFile conf/workers.properties

# You can use external file for mount points.
# # It will be checked for updates each 60 seconds.
# # The format of the file is: /url=worker
# # /examples/*=loadbalancer
JkMountFile conf/uriworkermap.properties

# Where to put jk logs
JkLogFile logs/mod_jk.log

# Set the jk log level [debug/error/info]
JkLogLevel info 
 
# Select the log format
JkLogStampFormat  "[%a %b %d %H:%M:%S %Y]"
 
# JkOptions indicates to send SSK KEY SIZE
JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories
 
# JkRequestLogFormat
JkRequestLogFormat "%w %V %T"
               
# Mount your applications
JkMount /application/* loadbalancer
 
# Add shared memory.
# This directive is present with 1.2.10 and
# later versions of mod_jk, and is needed for
# for load balancing to work properly
JkShmFile logs/jk.shm 
              
# Add jkstatus for managing runtime data
<Location /jkstatus/>
    JkMount status
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Location>

在 httpd/conf下建立workers.properties，並添加以下內容：

# Define list of workers that will be used
# for mapping requests
worker.list=loadbalancer,status

# Define Node1
# modify the host as your host IP or DNS name.
worker.node1.port=8009
worker.node1.host=10.66.192.231
worker.node1.type=ajp13
worker.node1.ping_mode=A
worker.node1.lbfactor=1 

# Define Node2
# modify the host as your host IP or DNS name.
worker.node2.port=8009
worker.node2.host=10.66.192.232
worker.node2.type=ajp13
worker.node2.ping_mode=A
worker.node2.lbfactor=1

# Load-balancing behavior
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=node1,node2
worker.loadbalancer.sticky_session=1

# Status worker for managing load balancer
worker.status.type=status

在 httpd/conf下建立uriworkermap.properties，並添加以下內容：

# Simple worker configuration file

# Mount the Servlet context to the ajp13 worker
/jmx-console=loadbalancer
/jmx-console/*=loadbalancer
/web-console=loadbalancer
/web-console/*=loadbalancer
#/printSession=loadbalancer
#/printSession/*=loadbalancer

配置完成後重啓 Apache httpd ，若是啓動顯示成功代表配置正確。

JBoss端配置

分別啓動10.66.192.231，10.66.192.232 JBoss,到管理界面，Profile -> General Configuration -> System Properties,單擊添加按鈕，添加兩組變量jvmRoute=node1,UseJK=true到10.66.192.231,以及jvmRoute=node2,UseJK=true到10.66.192.232.添加完成後，依次重啓兩個節點：

./standalone.sh -c standalone-ha.xml -b 10.66.192.231 -bmanagement=10.66.192.231 -u 239.255.100.100 -Djboss.node.name=node1

./standalone.sh -c standalone-ha.xml -b 10.66.192.232 -bmanagement=10.66.192.232 -u 239.255.100.100 -Djboss.node.name=node2

結束

至此，配置結束，咱們能夠部署測試應用測試高可用，負責均衡等，相似於JBoss 系列二：使用Apache httpd(mod_cluster)和JBoss構架高可用集羣環境