路由配置

路由的作用

路由配置是 CAT 集群流量负载均衡最重要的一环。路由配置提供了默认机器列表、多机房划分、地域划分等基本功能，路由选择的优先级为：同机房 > 同地域 > 默认机器 > 备用机器。

对于流量较高的机器，用户可以扩展相应的策略，通过路由配置将部分流量指定到低负载的机器。

配置入口

http:///localhost:8080/s/config?op=routerConfigUpdate

配置示例说明

通过一个实际生产环境的场景来说明路由配置的最佳实践：

  1. CAT 集群信息

路由配置 - 图1

  1. 路由配置示例
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <router-config backup-server="10.8.101.1" backup-server-port="2280" backup-server-http-port="8080">
  3.     <!-- sh_group1 -->
  4.     <default-server id="10.8.101.1" weight="1.0" port="2280" enable="true" http-port="8080"/>
  5.     <default-server id="10.8.101.2" weight="1.0" port="2280" enable="true" http-port="8080"/>
  6.     <default-server id="10.8.101.3" weight="1.0" port="2280" enable="true" http-port="8080"/>
  7.     <default-server id="10.8.101.4" weight="1.0" port="2280" enable="true" http-port="8080"/>
  8.     <default-server id="10.8.101.5" weight="1.0" port="2280" enable="true" http-port="8080"/>
  10.     <!-- sh_group2 -->
  11.     <default-server id="10.9.101.1" weight="1.0" port="2280" enable="true" http-port="8080"/>
  12.     <default-server id="10.9.101.2" weight="1.0" port="2280" enable="true" http-port="8080"/>
  13.     <default-server id="10.9.101.3" weight="1.0" port="2280" enable="true" http-port="8080"/>
  14.     <default-server id="10.9.101.4" weight="1.0" port="2280" enable="true" http-port="8080"/>
  15.     <default-server id="10.9.101.5" weight="1.0" port="2280" enable="true" http-port="8080"/>
  17.     <!-- bj_group1 -->
  18.     <default-server id="10.2.170.1" weight="1.0" port="2280" enable="true" http-port="8080"/>
  19.     <default-server id="10.2.170.2" weight="1.0" port="2280" enable="true" http-port="8080"/>
  20.     <default-server id="10.2.170.3" weight="1.0" port="2280" enable="true" http-port="8080"/>
  21.     <default-server id="10.2.170.4" weight="1.0" port="2280" enable="true" http-port="8080"/>
  22.     <default-server id="10.2.170.5" weight="1.0" port="2280" enable="true" http-port="8080"/>
  24.     <!-- bj_group2 -->
  25.     <default-server id="10.3.170.1" weight="1.0" port="2280" enable="true" http-port="8080"/>
  26.     <default-server id="10.3.170.2" weight="1.0" port="2280" enable="true" http-port="8080"/>
  27.     <default-server id="10.3.170.3" weight="1.0" port="2280" enable="true" http-port="8080"/>
  28.     <default-server id="10.3.170.4" weight="1.0" port="2280" enable="true" http-port="8080"/>
  29.     <default-server id="10.3.170.5" weight="1.0" port="2280" enable="true" http-port="8080"/>
  31.     <network-policy id="shanghai" title="default" block="false" server-group="shanghai">
  32.         <network id="10.8.101.0/24"/>
  33.         <network id="10.8.102.0/24"/>
  34.         <network id="10.9.101.0/24"/>
  35.         <network id="10.9.102.0/24"/>
  36.     </network-policy>
  38.     <network-policy id="beijing" title="default" block="false" server-group="beijing">
  39.         <network id="10.2.170.0/24"/>
  40.         <network id="10.2.171.0/24"/>
  41.         <network id="10.3.170.1/24"/>
  42.         <network id="10.3.171.1/24"/>
  43.     </network-policy>
  45.     <network-policy id="sh_group1" title="default" block="false" server-group="sh_group1">
  46.         <network id="10.8.101.0/24"/>
  47.         <network id="10.8.102.0/24"/>
  48.     </network-policy>
  50.     <network-policy id="sh_group2" title="default" block="false" server-group="sh_group1">
  51.         <network id="10.9.101.0/24"/>
  52.         <network id="10.9.102.0/24"/>
  53.     </network-policy>
  55.     <network-policy id="bj_group1" title="default" block="false" server-group="bj_group1">
  56.         <network id="10.2.170.0/24"/>
  57.         <network id="10.2.171.0/24"/>
  58.     </network-policy>
  60.     <network-policy id="bj_group2" title="default" block="false" server-group="bj_group1">
  61.         <network id="10.3.170.0/24"/>
  62.         <network id="10.3.171.0/24"/>
  63.     </network-policy>
  65.     <network-policy id="default" title="default" block="false" server-group="default">
  66.         <network id="10.8.101.0/24"/>
  67.         <network id="10.3.170.0/24"/>
  68.     </network-policy>
  70.     <server-group id="default" title="默认机器">
  71.         <group-server id="10.8.101.1"/>
  72.         <group-server id="10.8.101.2"/>
  73.         <group-server id="10.3.170.1"/>
  74.         <group-server id="10.3.170.2"/>
  75.     </server-group>
  77.     <server-group id="sh_group1" title="上海机房一组">
  78.         <group-server id="10.8.101.1"/>
  79.         <group-server id="10.8.101.2"/>
  80.         <group-server id="10.8.101.3"/>
  81.         <group-server id="10.8.101.4"/>
  82.         <group-server id="10.8.101.5"/>
  83.     </server-group>
  85.     <server-group id="sh_group2" title="上海机房二组">
  86.         <group-server id="10.9.101.1"/>
  87.         <group-server id="10.9.101.2"/>
  88.         <group-server id="10.9.101.3"/>
  89.         <group-server id="10.9.101.4"/>
  90.         <group-server id="10.9.101.5"/>
  91.     </server-group>
  93.     <server-group id="bj_group1" title="北京机房一组">
  94.         <group-server id="10.2.170.1"/>
  95.         <group-server id="10.2.170.2"/>
  96.         <group-server id="10.2.170.3"/>
  97.         <group-server id="10.2.170.4"/>
  98.         <group-server id="10.2.170.5"/>
  99.     </server-group>
  101.     <server-group id="bj_group2" title="北京机房二组">
  102.         <group-server id="10.3.170.1"/>
  103.         <group-server id="10.3.170.2"/>
  104.         <group-server id="10.3.170.3"/>
  105.         <group-server id="10.3.170.4"/>
  106.         <group-server id="10.3.170.5"/>
  107.     </server-group>
  109.     <server-group id="shanghai" title="上海机器">
  110.         <group-server id="10.8.101.1"/>
  111.         <group-server id="10.8.101.2"/>
  112.         <group-server id="10.8.101.3"/>
  113.         <group-server id="10.8.101.4"/>
  114.         <group-server id="10.8.101.5"/>
  115.         <group-server id="10.9.101.1"/>
  116.         <group-server id="10.9.101.2"/>
  117.         <group-server id="10.9.101.3"/>
  118.         <group-server id="10.9.101.4"/>
  119.         <group-server id="10.9.101.5"/>
  120.     </server-group>
  122.     <server-group id="beijing" title="北京机器">
  123.         <group-server id="10.2.170.1"/>
  124.         <group-server id="10.2.170.2"/>
  125.         <group-server id="10.2.170.3"/>
  126.         <group-server id="10.2.170.4"/>
  127.         <group-server id="10.2.170.5"/>
  128.         <group-server id="10.3.170.1"/>
  129.         <group-server id="10.3.170.2"/>
  130.         <group-server id="10.3.170.3"/>
  131.         <group-server id="10.3.170.4"/>
  132.         <group-server id="10.3.170.5"/>
  133.     </server-group>
  135.     <domain id="service-1">
  136.         <group id="default">
  137.             <server id="10.8.101.1" port="2280" weight="1.0"/>
  138.             <server id="10.8.101.2" port="2280" weight="1.0"/>
  139.             <server id="10.8.101.3" port="2280" weight="1.0"/>
  140.         </group>
  141.         <group id="shanghai">
  142.             <server id="10.8.101.1" port="2280" weight="1.0"/>
  143.             <server id="10.8.101.2" port="2280" weight="1.0"/>
  144.             <server id="10.8.101.3" port="2280" weight="1.0"/>
  145.         </group>
  146.         <group id="beijing">
  147.             <server id="10.2.170.1" port="2280" weight="1.0"/>
  148.             <server id="10.2.170.3" port="2280" weight="1.0"/>
  149.             <server id="10.2.170.5" port="2280" weight="1.0"/>
  150.         </group>
  151.     </domain>
  153.     <domain id="service-2">
  154.         <group id="default">
  155.             <server id="10.8.101.1" port="2280" weight="1.0"/>
  156.             <server id="10.8.101.3" port="2280" weight="1.0"/>
  157.             <server id="10.8.101.5" port="2280" weight="1.0"/>
  158.         </group>
  159.         <group id="sh_group1">
  160.             <server id="10.8.101.1" port="2280" weight="1.0"/>
  161.             <server id="10.8.101.3" port="2280" weight="1.0"/>
  162.             <server id="10.8.101.5" port="2280" weight="1.0"/>
  163.         </group>
  164.         <group id="shanghai">
  165.             <server id="10.8.101.1" port="2280" weight="1.0"/>
  166.             <server id="10.8.101.2" port="2280" weight="1.0"/>
  167.             <server id="10.8.101.3" port="2280" weight="1.0"/>
  168.         </group>
  169.         <group id="bj_group1">
  170.             <server id="10.2.170.1" port="2280" weight="1.0"/>
  171.             <server id="10.2.170.3" port="2280" weight="1.0"/>
  172.             <server id="10.2.170.5" port="2280" weight="1.0"/>
  173.         </group>
  174.         <group id="beijing">
  175.             <server id="10.2.170.1" port="2280" weight="1.0"/>
  176.             <server id="10.2.170.2" port="2280" weight="1.0"/>
  177.             <server id="10.2.170.3" port="2280" weight="1.0"/>
  178.         </group>
  179.     </domain>
  180. </router-config>

配置说明：

default-server : CAT 集群机器列表

  1. * enable : true 表示机器处于在线状态，主动对外提供服务；false 表示不对外主动提供服务，可用于定向测试、灰度测试以及备用应急处理。
  3. * weight : 机器权重比例。在定期构建路由报表时，会根据权重以及机器丢失数据量进行路由调整，具体参考 RouterConfigAdjustor。

network-policy : 网络划分，与公司内部网段划分有关。

  1. * network : 具体的网段划分。 例如 <network id="10.8.101.0/24"/> 对应在 <server-group id="sh_group1" title="上海机房一组"/> 中寻找最佳路由。

server-group : CAT 集群按地域、机房等策略划分，根据不同场景需求按需配置。

应用定向路由 & 动态调整

使用路由配置中 domain 配置项可以针对具体应用指定路由，常用于流量均衡调整、灰度测试等。

上述路由配置示例中应用 service-1 配置如下：

  1. <domain id="service-1">
  2.     <group id="default">
  3.         <server id="10.8.101.1" port="2280" weight="1.0"/>
  4.         <server id="10.8.101.2" port="2280" weight="1.0"/>
  5.         <server id="10.8.101.3" port="2280" weight="1.0"/>
  6.     </group>
  7.     <group id="shanghai">
  8.         <server id="10.8.101.1" port="2280" weight="1.0"/>
  9.         <server id="10.8.101.2" port="2280" weight="1.0"/>
  10.         <server id="10.8.101.3" port="2280" weight="1.0"/>
  11.     </group>
  12.     <group id="beijing">
  13.         <server id="10.2.170.1" port="2280" weight="1.0"/>
  14.         <server id="10.2.170.3" port="2280" weight="1.0"/>
  15.         <server id="10.2.170.5" port="2280" weight="1.0"/>
  16.     </group>
  17. </domain>

如果应用 service-1 集群中某个 IP 属于 beijing 的 server-group ，那么将优先使用 beijing 分组所提供的路由列表。