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<h1 id="loggie-sidecar">Loggie Sidecar方式采集日志<a class="headerlink" href="#loggie-sidecar" title="Permanent link">&para;</a></h1>
<blockquote>
<p>虽然默认不推荐使用Sidecar方式采集容器日志但是在某些受限场景下只能选择使用Sidecar的方式采集容器日志这里我们给出一个参考的示例。 </p>
</blockquote>
<h2 id="_1">总体思路<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<p>如下图所示:
<img alt="" src="../imgs/sidecar-collect.png" /></p>
<p>Loggie和业务container部署在同一个Pod里同时需要挂载相同的日志文件volume另外Loggie的配置可通过configMap的方式挂载到容器中Loggie根据提供的configMap配置文件采集容器的日志并发送到后端。 </p>
<h2 id="loggie-sidecar_1">注入Loggie sidecar<a class="headerlink" href="#loggie-sidecar_1" title="Permanent link">&para;</a></h2>
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Deployment</span>
<span class="nt">metadata</span><span class="p">:</span>
<span class="w"> </span><span class="nt">labels</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">tomcat</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">tomcat</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">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span>
<span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<span class="w"> </span><span class="nt">matchLabels</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">tomcat</span>
<span class="w"> </span><span class="nt">template</span><span class="p">:</span>
<span class="w"> </span><span class="nt">metadata</span><span class="p">:</span>
<span class="w"> </span><span class="nt">labels</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">tomcat</span>
<span class="w"> </span><span class="nt">spec</span><span class="p">:</span>
<span class="w"> </span><span class="nt">containers</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</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">tomcat</span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">tomcat</span>
<span class="w"> </span><span class="nt">volumeMounts</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">mountPath</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/usr/local/tomcat/logs</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">log</span>
<span class="w"> </span><span class="p p-Indicator">-</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">loggie</span>
<span class="w"> </span><span class="nt">args</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">-config.system=/opt/loggie/loggie.yml</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">-config.pipeline=/opt/loggie/pipeline.yml</span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">loggieio/loggie:main</span>
<span class="w"> </span><span class="nt">volumeMounts</span><span class="p">:</span>
<span class="w"> </span><span class="c1"># loggie和业务container挂载相同的log volume</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">mountPath</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/usr/local/tomcat/logs</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">log</span>
<span class="w"> </span><span class="c1"># 挂载日志配置configMap</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">mountPath</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/opt/loggie</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">loggie-config</span>
<span class="w"> </span><span class="c1"># 挂载loggie自身持久化的数据</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">mountPath</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/data</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">registry</span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">emptyDir</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</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">log</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">emptyDir</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{}</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">registry</span>
<span class="w"> </span><span class="p p-Indicator">-</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">loggie-config</span>
<span class="w"> </span><span class="nt">configMap</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">tomcat-loggie-config</span>
<span class="nn">---</span>
<span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ConfigMap</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">tomcat-loggie-config</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">data</span><span class="p">:</span>
<span class="w"> </span><span class="nt">loggie.yml</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">loggie:</span>
<span class="w"> </span><span class="no">reload:</span>
<span class="w"> </span><span class="no">enabled: true</span>
<span class="w"> </span><span class="no">period: 10s</span>
<span class="w"> </span><span class="no">monitor:</span>
<span class="w"> </span><span class="no">logger:</span>
<span class="w"> </span><span class="no">period: 30s</span>
<span class="w"> </span><span class="no">enabled: true</span>
<span class="w"> </span><span class="no">listeners:</span>
<span class="w"> </span><span class="no">filesource: ~</span>
<span class="w"> </span><span class="no">filewatcher: ~</span>
<span class="w"> </span><span class="no">reload: ~</span>
<span class="w"> </span><span class="no">sink: ~</span>
<span class="w"> </span><span class="no">http:</span>
<span class="w"> </span><span class="no">enabled: true</span>
<span class="w"> </span><span class="no">port: 9196</span>
<span class="w"> </span><span class="nt">pipeline.yml</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w"> </span><span class="no">pipelines:</span>
<span class="w"> </span><span class="no">- name: &quot;tomcat&quot;</span>
<span class="w"> </span><span class="no">sources:</span>
<span class="w"> </span><span class="no">- type: &quot;file&quot;</span>
<span class="w"> </span><span class="no">name: &quot;tomcatlog&quot;</span>
<span class="w"> </span><span class="no">paths:</span>
<span class="w"> </span><span class="no">- &quot;/usr/local/tomcat/logs/*.log&quot;</span>
<span class="w"> </span><span class="no">fields:</span>
<span class="w"> </span><span class="no">namespace: default</span>
<span class="w"> </span><span class="no">deployment: tomcat</span>
<span class="w"> </span><span class="no">fieldsFromEnv:</span>
<span class="w"> </span><span class="no">podname: HOSTNAME</span>
<span class="w"> </span><span class="no">sink:</span>
<span class="w"> </span><span class="no">type: &quot;dev&quot;</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">pretty: true</span>
</code></pre></div>
<p>可以参考以上的部署方式通过loggie sidecar采集容器日志。<br />
需要注意的是:</p>
<ul>
<li>目前不建议在配置文件中enable kubernetes discovery由于打开后会请求Kubernetes在Pods比较多的时候会对Kubernetes造成一定压力所以无法使用LogConfig CRD需要使用configMap挂载配置文件。 </li>
<li>由于不使用Kubernetes discovery这里的fields并不会被自动加上Pod的元信息需要使用fieldsFromEnv的方式从Pod的环境变量里获取。</li>
</ul>
<div class="admonition tips">
<p class="admonition-title">Tips</p>
<ul>
<li>namespace等固定信息可以配置到fields里也可以通过使用downward API的方式引用到env里</li>
<li>fieldsFromEnv获取到的Env环境变量不仅仅局限在Pod yaml里配置的env字段Loggie容器里任意的环境变量均可我们可以在容器里执行<code>env</code>命令查看。 </li>
</ul>
</div>
<ul>
<li>修改configMap中的参数需要经过一段时间后才会被刷新到Pod里如果希望立即生效需要重建Pod请注意是否影响业务</li>
</ul>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>Loggie后续会支持自动Sidecar注入和通过LogConfig自动生成ConfigMap挂载的方式从而达到和使用DaemonSet一致的体验。 </p>
</div>
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