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Istio
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<h1>Istio 0.8 Release发布</h1>
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<h2 class="subheading">来自Istio的儿童节礼物</h2>
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<span class="meta">
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Posted by
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"赵化冰"
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on
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Saturday, June 2, 2018
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<article>
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<div class="container">
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<div class="row">
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<div class="
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col-lg-8 col-lg-offset-2
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col-md-10 col-md-offset-1
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post-container">
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<blockquote>
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||
<p>在6月1日这一天的早上，Istio社区宣布发布0.8 Release，除了常规的故障修复和性能改进外，这个儿童节礼物里面还有什么值得期待内容呢？让我们来看一看：</p>
|
||
</blockquote>
|
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<h2 id="networking">Networking</h2>
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<h3 id="改进的流量管理模型">改进的流量管理模型</h3>
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<p>0.8版本采用了新的流量管理配置模型<a href="https://istio.io/blog/2018/v1alpha3-routing/">v1alpha3 Route API</a>。新版本的模型添加了一些新的特性，并改善了之前版本模型中的可用性问题。主要的改动包括：</p>
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<h4 id="gateway">Gateway</h4>
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<p>新版本中不再使用K8s中的Ingress，转而采用Gateway来统一配置Service Mesh中的各个HTTP/TCP负载均衡器。Gateway可以是处理入口流量的Ingress Gateway，负责Service Mesh内部各个服务间通信的Sidecar Proxy，也可以是负责出口流量的Egress Gateway。</p>
|
||
<p>Mesh中涉及到的三类Gateway: <br>
|
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|
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<img src="/img/2018-06-02-istio08/gateways.svg" alt="Gateway">
|
||
|
||
</p>
|
||
<p>该变化的原因是K8s中的Ingress对象功能过于简单，不能满足Istio灵活的路由规则需求。在0.8版本中，L4-L6的配置和L7的配置被分别处理，Gateway中只配置L4-L6的功能，例如暴露的端口，TLS设置。然后用户可以采用VirtualService来配置标准的Istio规则，并和Gateway进行绑定。</p>
|
||
<h4 id="virtualservice">VirtualService</h4>
|
||
<p>采用VirtualService代替了alpha2模型中的RouteRule。采用VirtualService有两个优势：</p>
|
||
<p><strong>可以把一个服务相关的规则放在一起管理</strong></p>
|
||
<p>例如下面的路由规则，发向reviews的请求流量缺省destination为v1，如果user为jason则路由到v2。在v1模型中需要采用两条规则来实现，采用VirtualService后放到一个规则下就可以实现。</p>
|
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<pre tabindex="0"><code>apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: reviews
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spec:
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hosts:
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- reviews
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http:
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- match:
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- headers:
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cookie:
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regex: "^(.*?;)?(user=jason)(;.*)?$"
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route:
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- destination:
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host: reviews
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subset: v2
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- route:
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- destination:
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host: reviews
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subset: v1
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</code></pre><p><strong>可以对外暴露一个并不存在的“虚拟服务”，然后将该“虚拟服务”映射到Istio中的Service上</strong></p>
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<p>下面规则中的bookinfo.com是对外暴露的“虚拟服务”，bookinfo.com/reviews被映射到了reviews服务，bookinfo.com/ratings被映射到了ratings服务。通过采用VirtualService，极大地增强了Istio路由规则的灵活性，有利于Legacy系统和Istio的集成。</p>
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||
<pre tabindex="0"><code>apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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||
name: bookinfo
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spec:
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hosts:
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- bookinfo.com
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||
http:
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||
- match:
|
||
- uri:
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||
prefix: /reviews
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||
route:
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||
- destination:
|
||
host: reviews
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||
- match:
|
||
- uri:
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||
prefix: /ratings
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route:
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||
- destination:
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host: ratings
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||
...
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||
</code></pre><h3 id="envoy-v2">Envoy V2</h3>
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||
<p>控制面和数据面标准接口支持Envoy</p>
|
||
<h3 id="用gateway代替-ingressengress">用Gateway代替 Ingress/Engress</h3>
|
||
<p>前面已经介绍到，新的版本中不再支持将Kubernetes的Ingress和Istio路由规则一起使用。Istio 0.8支持平台无关的 Ingress/Egress Gateway,可以在Kubernetes，Cloud Foundry中和Istio路由规则无缝集成。</p>
|
||
<h3 id="对入站端口进行限制">对入站端口进行限制</h3>
|
||
<p>0.8版本只允许访问Pod内已声明端口的入站流量。</p>
|
||
<h2 id="security">Security</h2>
|
||
<h3 id="安全组件citadel">安全组件Citadel</h3>
|
||
<p>将Istio的安全组件Istio-Auth/Istio-CA正式命名为Citadel（堡垒）。</p>
|
||
<h3 id="跨集群支持">跨集群支持</h3>
|
||
<p>部署在多个Cluster中的Citadel可以共享同一Root Certificate，以支持不同Cluster内的服务可以跨Cluster进行认证。</p>
|
||
<h3 id="认证策略">认证策略</h3>
|
||
<p>认证策略既支持Service-to-Service认证，也支持对终端用户进行认证。</p>
|
||
<h2 id="遥测">遥测</h2>
|
||
<p>Mixer和Pilot将上报自身的遥测数据，其上报的流程和Mesh中的普通服务相同。</p>
|
||
<h2 id="安装">安装</h2>
|
||
<p>按需安装部分组件：支持只安装所需的组件，如果只需要使用Istio的路由规则，可以选择只安装Pilot，而不安装Mixer和Citadel。</p>
|
||
<h2 id="mixer">Mixer</h2>
|
||
<p>CloudWatch：增加了一个CloudWatch插件，可以向AWS CloudWatch上报度量数据。</p>
|
||
<h2 id="已知故障">已知故障：</h2>
|
||
<ul>
|
||
<li>如果Gateway绑定的VirtualService指向的是headless service，则该规则不能正常工作。</li>
|
||
<li>0.8版本和Kubernetes1.10.2存在兼容问题，目前建议采用1.9版本。</li>
|
||
<li>convert-networking-config工具存在故障，一个其它的namespace可能会被修改为istio-system namespace。可以在允许转换工具后手动修改文件来避免。</li>
|
||
</ul>
|
||
<h2 id="总结">总结</h2>
|
||
<p>0.8版本带来的最大变化是流量配置模型的重构，重构后的模型整合了外部Gateway和内部Sidecar Proxy的路由配置。同时VirtualService的引入使路由规则的配置更为集中和灵活。</p>
|
||
|
||
|
||
|
||
<div class="entry-shang text-center">
|
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|
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<p>「真诚赞赏，手留余香」</p>
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<button class="zs show-zs btn btn-bred">赞赏支持</button>
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</div>
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<div class="zs-modal-bg"></div>
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<div class="zs-modal-box">
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<div class="zs-modal-head">
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<button type="button" class="close">×</button>
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||
<span class="author"><a href="http://localhost:1313/"><img src="/img/favicon.png" />David Young</a></span>
|
||
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<p class="tip"><i></i><span>真诚赞赏，手留余香</span></p>
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</div>
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<div class="zs-modal-body">
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<div class="zs-modal-btns">
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<button class="btn btn-blink" data-num="2">2元</button>
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<button class="btn btn-blink" data-num="5">5元</button>
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<button class="btn btn-blink" data-num="10">10元</button>
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<button class="btn btn-blink" data-num="50">50元</button>
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<button class="btn btn-blink" data-num="100">100元</button>
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<button class="btn btn-blink" data-num="1">任意金额</button>
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</div>
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<div class="zs-modal-pay">
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<button class="btn btn-bred" id="pay-text">2元</button>
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<p>使用<span id="pay-type">微信</span>扫描二维码完成支付</p>
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<img src="/img/reward/wechat-2.png" id="pay-image"/>
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<div class="zs-modal-footer">
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<label><input type="radio" name="zs-type" value="wechat" class="zs-type" checked="checked"><span ><span class="zs-wechat"><img src="/img/reward/wechat-btn.png"/></span></label>
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<label><input type="radio" name="zs-type" value="alipay" class="zs-type" class="zs-alipay"><img src="/img/reward/alipay-btn.png"/></span></label>
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<script type="text/javascript" src="/js/reward.js"></script>
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<link href="https://xxx.xxx.com/dist/Artalk.css" rel="stylesheet" />
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|
||
|
||
<script>
|
||
Artalk.init({
|
||
el: '#Comments',
|
||
pageKey: 'http:\/\/localhost:1313\/2018\/06\/02\/istio08\/',
|
||
pageTitle: 'Istio 0.8 Release发布',
|
||
server: 'https:\/\/xxx.xxx.com',
|
||
site: 'xxx blog',
|
||
})
|
||
</script>
|
||
|
||
|
||
</div>
|
||
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visible-lg-block
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sidebar-container
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catalog-container">
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col-lg-8 col-lg-offset-2
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col-md-10 col-md-offset-1
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<section>
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<hr class="hidden-sm hidden-xs">
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<h5><a href="/tags/">FEATURED TAGS</a></h5>
|
||
<div class="tags">
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||
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|
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||
|
||
|
||
|
||
<a href="/tags/docker" title="docker">
|
||
docker
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
<a href="/tags/istio" title="istio">
|
||
istio
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<a href="/tags/kubernetes" title="kubernetes">
|
||
kubernetes
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
<a href="/tags/microservice" title="microservice">
|
||
microservice
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
<a href="/tags/security" title="security">
|
||
security
|
||
</a>
|
||
|
||
|
||
|
||
<a href="/tags/service-mesh" title="service mesh">
|
||
service mesh
|
||
</a>
|
||
|
||
|
||
|
||
<a href="/tags/tips" title="tips">
|
||
tips
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
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|
||
</section>
|
||
|
||
|
||
|
||
|
||
<section>
|
||
<hr>
|
||
<h5>FRIENDS</h5>
|
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<ul class="list-inline">
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||
|
||
<li><a target="_blank" href="https://zhaozhihan.com">Linda的博客</a></li>
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||
|
||
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|
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<footer>
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</a>
|
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<li>
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<i class="fab fa-weixin fa-stack-1x fa-inverse"></i>
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<li>
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<script>
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|
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if($('#tag_cloud').length !== 0){
|
||
loadAsync("/js/jquery.tagcloud.js",function(){
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|
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$('#tag_cloud a').tagcloud();
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<script>
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function generateCatalog(selector) {
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|
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|
||
_containerSelector = 'div.post-container'
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||
|
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|
||
|
||
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||
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|
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||
|
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||
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|
||
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|
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|
||
generateCatalog(".catalog-body");
|
||
|
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|
||
$(".catalog-toggle").click((function (e) {
|
||
e.preventDefault();
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|
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$('.catalog-body').onePageNav({
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||
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|
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|
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|
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|
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</body>
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</html>
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