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 会包含fail-over，但我错了。我认为如果一个实例不活动，那么使用另一个实例也成为负载管理的一部分。用了足够的术语，我设置了故障转移，但具有讽刺意味的是fail-over 本身正在失败。

一旦我关闭了一个 tomcat 实例，整个设置就死了​​，我得到 503。有人可以帮我理解问题所在。

在 apache2.conf 中添加了这个：

JkWorkersFile /etc/apache2/workers.properties

JkMount /* loadbalancer

workers.properties：

GNU nano 2.2.6 文件：workers.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-默认启用站点：

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>

我在配置中同时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，您使用的是两个不同的代理模块，不要那样做。

一个是mod_jk，配置文件有worker.properties、uriworkermap.properties和apache.conf这部分：

JkMount /* loadbalancer

并且在 000-default 中

JkMountCopy On

另一个是mod_proxy和000-default中的相关配置：

<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 cmets，让我们走 mod_jk 路线。首先删除 mod_proxy 配置部分，基本上都是 000-default 中的所有内容，只保留：

JkMountCopy On

然后禁用加载此模块（不是必需的，但更好）：

mod_proxy_*

然后在workers.properties中将这个添加到你的负载均衡器的worker中：

worker.loadbalancer.sticky_session_force = false

并检查一切是否正常，基于此我会更新答案