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1. 准备Kubernetes环境
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<h1 id="kubernetes-pod">快速上手采集Kubernetes Pod日志<a class="headerlink" href="#kubernetes-pod" title="Permanent link">&para;</a></h1>
<p>下面将带你演示在一个Kubernetes集群中通过创建LogConfig CRD快速采集Pod的日志。</p>
<h2 id="1-kubernetes">1. 准备Kubernetes环境<a class="headerlink" href="#1-kubernetes" title="Permanent link">&para;</a></h2>
<p>可以使用现有Kubernetes集群或者<a href="https://kubernetes.io/zh/docs/tasks/tools/">部署Kubernetes</a>。本地推荐使用<a href="https://kind.sigs.k8s.io/">Kind</a>搭建Kubernetes集群。 </p>
<p>本文的操作需要在本地使用:</p>
<ul>
<li>kubectl<a href="https://github.com/kubernetes/kubernetes/tree/master/CHANGELOG">下载</a></li>
<li>helm<a href="https://helm.sh/docs/intro/install/">下载</a></li>
</ul>
<p>请确保本地有kubectl和helm可执行命令。</p>
<h2 id="2-loggie-daemonset">2. 部署Loggie DaemonSet<a class="headerlink" href="#2-loggie-daemonset" title="Permanent link">&para;</a></h2>
<p>你可以在 <a href="https://github.com/loggie-io/installation/releases">installation</a> 页面查看所有发布的部署chart。</p>
<p>可以选择:</p>
<h4 id="chart">下载chart再部署<a class="headerlink" href="#chart" title="Permanent link">&para;</a></h4>
<p><div class="highlight"><pre><span></span><code><span class="nv">VERSION</span><span class="o">=</span>v1.4.0
helm<span class="w"> </span>pull<span class="w"> </span>https://github.com/loggie-io/installation/releases/download/<span class="nv">$VERSION</span>/loggie-<span class="nv">$VERSION</span>.tgz<span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span>tar<span class="w"> </span>xvzf<span class="w"> </span>loggie-<span class="nv">$VERSION</span>.tgz
</code></pre></div>
尝试修改一下其中的values.yaml。
请将以上的<code>&lt;VERSION&gt;</code>替换成具体的版本号。</p>
<p>然后部署安装:</p>
<div class="highlight"><pre><span></span><code>helm<span class="w"> </span>install<span class="w"> </span>loggie<span class="w"> </span>./loggie<span class="w"> </span>-nloggie<span class="w"> </span>--create-namespace
</code></pre></div>
<p>当然你也可以:</p>
<h4 id="_1">直接部署:<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h4>
<p><div class="highlight"><pre><span></span><code>helm<span class="w"> </span>install<span class="w"> </span>loggie<span class="w"> </span>-nloggie<span class="w"> </span>--create-namespace<span class="w"> </span>https://github.com/loggie-io/installation/releases/download/<span class="nv">$VERSION</span>/loggie-<span class="nv">$VERSION</span>.tgz
</code></pre></div>
请将以上的<code>&lt;VERSION&gt;</code>替换成具体的版本号。</p>
<div class="admonition node">
<p class="admonition-title">想使用其他版本镜像?</p>
<p>为了方便体验最新的Fix和特性我们提供了main分支每次合并后的镜像版本可通过 <a href="https://hub.docker.com/r/loggieio/loggie/tags">这里</a> 进行选择。<br />
同时你可以在helm install命令中增加<code>--set image=loggieio/loggie:vX.Y.Z</code>来指定具体的Loggie镜像。</p>
</div>
<div class="admonition caution">
<p class="admonition-title">部署有问题?</p>
<p>如果尝试部署后出现问题,或者在你的环境中以下演示操作未成功,请参考<a href="../../install/kubernetes/">Kubernetes下部署Loggie</a>,修改相关配置。</p>
</div>
<h2 id="3">3. 采集日志<a class="headerlink" href="#3" title="Permanent link">&para;</a></h2>
<p>Loggie定义了Kubernetes CRD LogConfig一个LogConfig表示采集一类Pods的日志采集任务。</p>
<h3 id="31-pods">3.1 创建被采集的Pods<a class="headerlink" href="#31-pods" title="Permanent link">&para;</a></h3>
<p>我们先创建一个Pod用于被采集日志的对象。
<div class="highlight"><pre><span></span><code>kubectl<span class="w"> </span>create<span class="w"> </span>deploy<span class="w"> </span>nginx<span class="w"> </span>--image<span class="o">=</span>nginx
</code></pre></div>
接下来将采集这个Nginx Pod的标准输出stdout日志。 </p>
<h3 id="32-sink">3.2 定义输出源Sink<a class="headerlink" href="#32-sink" title="Permanent link">&para;</a></h3>
<p>接着我们创建一个Loggie定义的CRD Sink实例表明日志发送的后端。<br />
为了方便演示这里我们将日志发送至Loggie Agent自身的日志中并打印。 </p>
<div class="highlight"><pre><span></span><code><span class="l l-Scalar l-Scalar-Plain">cat &lt;&lt; EOF | kubectl apply -f -</span>
<span class="l l-Scalar l-Scalar-Plain">apiVersion</span><span class="p p-Indicator">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">loggie.io/v1beta1</span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Sink</span>
<span class="nt">metadata</span><span class="p">:</span>
<span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w"> </span><span class="nt">sink</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">type: dev</span>
<span class="w"> </span><span class="no">printEvents: true</span>
<span class="l l-Scalar l-Scalar-Plain">EOF</span>
</code></pre></div>
<p>可以通过<code>kubectl get sink</code>查看到已创建的Sink。</p>
<h3 id="33">3.3 定义采集任务<a class="headerlink" href="#33" title="Permanent link">&para;</a></h3>
<p>Loggie定义CRD LogConfig表示一个日志采集任务。我们创建一个LogConfig示例如下所示 </p>
<div class="highlight"><pre><span></span><code><span class="l l-Scalar l-Scalar-Plain">cat &lt;&lt; EOF | kubectl apply -f -</span>
<span class="l l-Scalar l-Scalar-Plain">apiVersion</span><span class="p p-Indicator">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">loggie.io/v1beta1</span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">LogConfig</span>
<span class="nt">metadata</span><span class="p">:</span>
<span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">nginx</span>
<span class="w"> </span><span class="nt">namespace</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">pod</span>
<span class="w"> </span><span class="nt">labelSelector</span><span class="p">:</span>
<span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">nginx</span>
<span class="w"> </span><span class="nt">pipeline</span><span class="p">:</span>
<span class="w"> </span><span class="nt">sources</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">- type: file</span>
<span class="w"> </span><span class="no">name: mylog</span>
<span class="w"> </span><span class="no">paths:</span>
<span class="w"> </span><span class="no">- stdout</span>
<span class="w"> </span><span class="nt">sinkRef</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default</span>
<span class="l l-Scalar l-Scalar-Plain">EOF</span>
</code></pre></div>
<p>可以看到上面使用了sinkRef引用了刚才创建的<code>sink default CR</code>。当然我们还可以直接在Logconfig中使用sink字段示例如下</p>
<div class="highlight"><pre><span></span><code><span class="l l-Scalar l-Scalar-Plain">cat &lt;&lt; EOF | kubectl apply -f -</span>
<span class="l l-Scalar l-Scalar-Plain">apiVersion</span><span class="p p-Indicator">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">loggie.io/v1beta1</span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">LogConfig</span>
<span class="nt">metadata</span><span class="p">:</span>
<span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">nginx</span>
<span class="w"> </span><span class="nt">namespace</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">pod</span>
<span class="w"> </span><span class="nt">labelSelector</span><span class="p">:</span>
<span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">nginx</span>
<span class="w"> </span><span class="nt">pipeline</span><span class="p">:</span>
<span class="w"> </span><span class="nt">sources</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">- type: file</span>
<span class="w"> </span><span class="no">name: mylog</span>
<span class="w"> </span><span class="no">paths:</span>
<span class="w"> </span><span class="no">- stdout</span>
<span class="w"> </span><span class="nt">sink</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">type: dev</span>
<span class="w"> </span><span class="no">printEvents: true</span>
<span class="w"> </span><span class="no">codec:</span>
<span class="w"> </span><span class="no">type: json</span>
<span class="w"> </span><span class="no">pretty: true</span>
<span class="l l-Scalar l-Scalar-Plain">EOF</span>
</code></pre></div>
<p>创建完之后,我们可以使用<code>kubectl get lgc</code>查看到创建的CRD实例。</p>
<p>同时,我们还可以通过<code>kubectl describe lgc nginx</code>查看LogConfig的事件以获取最新的状态。</p>
<div class="highlight"><pre><span></span><code>Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal syncSuccess 52s loggie/kind-control-plane Sync type pod [nginx-6799fc88d8-5cb67] success
</code></pre></div>
<p>上面的nginx LogConfig通过其中的spec.selector来匹配采集哪些Pod的日志这里我们使用<code>app: nginx</code>选择了刚才创建的nginx Pod。<br />
spec.pipeline则表示Loggie的Pipeline配置我们只采集容器标准输出的日志所以在paths中填写<code>stdout</code>即可。 </p>
<h2 id="4">4. 查看日志<a class="headerlink" href="#4" title="Permanent link">&para;</a></h2>
<p>首先找到所在的nginx pod节点
<div class="highlight"><pre><span></span><code>kubectl<span class="w"> </span>get<span class="w"> </span>po<span class="w"> </span>-owide<span class="w"> </span>-l<span class="w"> </span><span class="nv">app</span><span class="o">=</span>nginx
</code></pre></div></p>
<p>然后我们找到该节点的Loggie
<div class="highlight"><pre><span></span><code>kubectl<span class="w"> </span>-nloggie<span class="w"> </span>get<span class="w"> </span>po<span class="w"> </span>-owide<span class="w"> </span><span class="p">|</span>grep<span class="w"> </span><span class="si">${</span><span class="nv">node</span><span class="si">}</span>
</code></pre></div>
可以通过:
<div class="highlight"><pre><span></span><code>kubectl<span class="w"> </span>-nloggie<span class="w"> </span>logs<span class="w"> </span>-f<span class="w"> </span><span class="si">${</span><span class="nv">logge</span><span class="p">-pod</span><span class="si">}</span>
</code></pre></div>
查看Loggie打印出的日志里面展示了采集到的nginx标准输出日志。 </p>
<h2 id="_2">更多<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<p>上文只是一个简单的快速演示部署出现问题或者想了解更多Kubernetes下Loggie如何使用</p>
<ul>
<li>更全面的部署介绍:<a href="../../install/kubernetes/">Kubernetes下部署Loggie</a></li>
<li>Kubernetes下日志采集最佳实践<a href="../../../user-guide/use-in-kubernetes/collect-container-logs/">Kubernetes下的日志采集</a></li>
</ul>
</article>
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