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| <h2 id="_1">场景描述</h2> |
| <p>用户使用域名连接公有云或者三方系统时，需要使用到域名解析系统。在不同的系统、不同的框架使用的域名解析机制都可能不太一样。所以我们有必要提供一个统一的配置入口，以便开发运维人员可以自定义DNS解析机制，而不完全受制于系统配置。</p> |
| <h2 id="dns">DNS配置</h2> |
| <p>DNS配置项写在microservice.yaml文件中，支持统一制定证书，也可以添加tag进行更细粒度的配置，有tag的配置会覆盖全局配置，配置格式如下：</p> |
| <pre><code>addressResolver.[tag].[property] |
| </code></pre> |
| <p>常见的tag如下表： </p> |
| <table> |
| <thead> |
| <tr> |
| <th align="left">项目</th> |
| <th align="left">tag</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">服务中心</td> |
| <td align="left">sc.consumer</td> |
| </tr> |
| <tr> |
| <td align="left">配置中心</td> |
| <td align="left">cc.consumer</td> |
| </tr> |
| <tr> |
| <td align="left">看板中心</td> |
| <td align="left">mc.consumer</td> |
| </tr> |
| <tr> |
| <td align="left">用户自定义</td> |
| <td align="left">self.tag</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>各个properties详细说明（设置Vertx DNS解析） </p> |
| <pre><code class="language-yaml">addressResolver: |
| servers: 8.8.8.8,8.8.4.4 #对应Linux /etc/resolv.conf的nameserver,DNS服务器地址，支持配置多个，以逗号隔开 |
| ndots: 1 #对应linux /etc/resolv.conf里面的options: ndots, 作用就是如果给的域名里面包含的点的个数少于该阈值，那么DNS解析的时候就会默认加上searchDomains的值，这个必须和searchDomains搭配使用，Linux默认为1 |
| searchDomains: a,b,c #对应linux /etc/resolv.conf里面的search，和ndots搭配使用，如果当前域名的点个数少于设置值，解析时就会把这些值添加到域名后面一起解析，比如ndots设置的为4，当前域名为servicecomb.cn-north-1.myhwclouds.com，只有三个点，那么解析的时候就会自动加上servicecomb.cn-north-1.myhwclouds.com.a去解析，没解析出来在用servicecomb.cn-north-1.myhwclouds.com.b，直到能最后解析出来 |
| optResourceEnabled: true #optional record is automatically included in DNS queries |
| cacheMinTimeToLive: 0 #最小缓存时间 |
| cacheMaxTimeToLive: 10000 #最大缓存时间 |
| cacheNegativeTimeToLive: 0 #DNS解析失败后，下次重试的等待时间 |
| queryTimeout: 5000 #查询超时时间 |
| maxQueries: 4 #查询次数 |
| rdFlag: true #设置DNS递归查询 |
| rotateServers: true #设置是否支持轮询 |
| </code></pre> |
| <h2 id="_2">示例</h2> |
| <pre><code class="language-java">VertxOptions vertxOptions = new VertxOptions(); |
| vertxOptions.setAddressResolverOptions(AddressResolverConfig.getAddressResover("self.tag")); |
| Vertx vertx = VertxUtils.getOrCreateVertxByName("registry", vertxOptions); |
| // this has to set the client options |
| HttpClientOptions httpClientOptions = createHttpClientOptions(); |
| ClientPoolManager<HttpClientWithContext> clientMgr = new ClientPoolManager<>(vertx, new HttpClientPoolFactory(httpClientOptions)); |
| clientMgr.findThreadBindClientPool().runOnContext(httpClient -> { |
| // do some http request |
| }); |
| </code></pre> |
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