Tomcat，Apache：即使配置后故障转移也无法正常工作

Question

我正在使用Apache和tomcat来设置负载平衡和故障转移。 最初，我认为load-balancing将包括fail-over ，但是我错了。 我认为，如果一个实例处于非活动状态，那么使用另一个实例也将成为负载管理的一部分。 有了足够的术语，我就设置了故障转移，但具有讽刺意味的是， fail-over本身就是故障。

一旦我关闭了一个tomcat实例，整个安装程序就死了，我得到了503。有人可以帮助我了解问题所在。

在apache2.conf中添加了它：

JkWorkersFile /etc/apache2/workers.properties

JkMount /* loadbalancer

worker.properties：

GNU nano 2.2.6文件：worker.properties

 worker.list=loadbalancer
 worker.server1.port=8010
 worker.server1.host=localhost
 worker.server1.type=ajp13

 worker.server2.port=8011
 worker.server2.host=localhost
 worker.server2.type=ajp13

 worker.server1.lbfactor=1
 worker.server2.lbfactor=1

 worker.loadbalancer.type=lb
 worker.loadbalancer.balance_workers=server1,server2
worker.loadbalancer.method=B
worker.balancer.sticky_session=True

000-default在启用站点中：

JkMountCopy On
<Proxy balancer://mycluster>
    BalancerMember ajp://localhost:8010 route=server1 connectiontimeout=10
    BalancerMember ajp://localhost:8011 route=server2 connectiontimeout=10

   ProxySet stickysession=JSESSIONID|jsessionid
   Order Deny,Allow
   Deny from none
   Allow from all

</Proxy>

<VirtualHost *:80>
ProxyRequests off

ProxyPass /balancer-manager !
ProxyPass / balancer://mycluster/
ProxyPassReverse / balancer://mycluster/
</VirtualHost>

<Location /balancer-manager>
SetHandler balancer-manager

Order Deny,Allow
Deny from none
Allow from all
</Location>

第一个tomcat的server.xml：

<Connector port="8080" proxyPort="80" protocol="HTTP/1.1" compression="force" compressionMinSize="1024" 
               connectionTimeout="20000"
               redirectPort="443" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"/>


<Connector port="443" enableLookups="false" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="200" compression="force"
              compressionMinSize="1024" scheme="https" secure="true" clientAuth="false"  sslProtocol="TLS"
                keystoreFile="keystore_file" keystorePass="PASSWORD" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"
/>
   <Connector port="8010" protocol="AJP/1.3" redirectPort="443" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"
/>
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="server1">
    // No modifications inside
</Engine>

第二个Tomcat的server.xml：

<Connector port="8081" proxyPort="80" protocol="HTTP/1.1" compression="force" compressionMinSize="1024" 
               connectionTimeout="20000"
               redirectPort="443" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"/>


<Connector port="443" enableLookups="false" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="200" compression="force"
              compressionMinSize="1024" scheme="https" secure="true" clientAuth="false"  sslProtocol="TLS"
                keystoreFile="keystore_file" keystorePass="PASSWORD" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"
/>
 <Connector port="8011" protocol="AJP/1.3" redirectPort="8443" URIEncoding="utf-8"
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"
/>
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="server2">
    // No modifications here
    </Engine>

我在配置中一起实现负载平衡和故障转移时犯了什么错误。 非常感谢。

Answer 1

首先，您正在使用两个不同的代理模块，请不要这样做。

一个是mod_jk，配置文件是worker.properties，uriworkermap.properties，在apache.conf中这部分：

JkMount /* loadbalancer

并以000默认值

JkMountCopy On

另一个是mod_proxy，其相对配置在000-default中：

<Proxy balancer://mycluster>
    BalancerMember ajp://localhost:8010 route=server1 connectiontimeout=10
    BalancerMember ajp://localhost:8011 route=server2 connectiontimeout=10

    ProxySet stickysession=JSESSIONID|jsessionid
    Order Deny,Allow
    Deny from none
    Allow from all

    </Proxy>

<VirtualHost *:80>

ProxyRequests off

ProxyPass /balancer-manager !
ProxyPass / balancer://mycluster/
ProxyPassReverse / balancer://mycluster/
</VirtualHost>

<Location /balancer-manager>
SetHandler balancer-manager

Order Deny,Allow
Deny from none
Allow from all
</Location>

至于评论，让我们走mod_jk路线。 首先删除mod_proxy配置部分，基本上是000-default中的所有内容，仅保留：

JkMountCopy On

然后禁用此模块的加载（不必要，但更好）：

mod_proxy_ *

然后在worker.properties中将其添加到您的loadbalancer的worker中：

worker.loadbalancer.sticky_session_force = false

并检查一切是否正常，基于此我将更新答案