Tomcat，Apache：即使在配置后故障转移也不起作用

Question

我正在使用Apache和tomcat来设置负载平衡和故障转移。最初我以为load-balancing将包括fail-over，但我错了。我认为如果一个实例不活跃，那么消费其他实例也会成为负载管理的一部分。足够的术语，我安装故障转移，但具有讽刺意味的部分是fail-over本身就是失败。

只要我关闭了一个tomcat实例，整个设置就会死机，我得到了503。有人可以帮我理解问题所在。

添加了这个在apache2.conf：

JkWorkersFile /etc/apache2/workers.properties 

JkMount /* loadbalancer 

workers.properties：

GNU纳米2.2.6文件：workers.properties

启用站点，

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-默认：

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> 

首先tomcat的server.xml中：

<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> 

二Tomcat的server.xml中：

<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> 

我提出的配置实现负载均衡和故障转移在一起是什么错误。非常感谢。

Answer 1

首先，您正在使用两个不同的代理模块，不这样做。

一个是mod_jk的，而配置文件workers.properties，uriworkermap.properties并在此的apache.conf部分：

JkMount /* loadbalancer 

而在000默认

JkMountCopy On 

另一种是mod_proxy和000-default中的相对配置：

<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g o mod_jk路由。首先拆下mod_proxy的配置部分，基本上全部是000，默认只留下：

JkMountCopy On 

然后禁用加载这个模块（不neccessary但更好）：

mod_proxy_ *

然后加入这在workers.properties找你的负载均衡器的工人：

worker.loadbalancer.sticky_session_force =假

而且检查是否有用，基于此我会更新答案