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PivotalLabsAndSamples/student-lab-instructions/08-spring-boot-actuator.html

08-spring-boot-actuator.html 49KB
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  207. .exampleblock>.content>:last-child{margin-bottom:0}

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  210. .sidebarblock>:last-child{margin-bottom:0}

  211. .sidebarblock>.content>.title{color:#7a2518;margin-top:0;text-align:center}

  212. .exampleblock>.content>:last-child>:last-child,.exampleblock>.content .olist>ol>li:last-child>:last-child,.exampleblock>.content .ulist>ul>li:last-child>:last-child,.exampleblock>.content .qlist>ol>li:last-child>:last-child,.sidebarblock>.content>:last-child>:last-child,.sidebarblock>.content .olist>ol>li:last-child>:last-child,.sidebarblock>.content .ulist>ul>li:last-child>:last-child,.sidebarblock>.content .qlist>ol>li:last-child>:last-child{margin-bottom:0}

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  221. .listingblock pre.highlightjs>code{padding:1em;-webkit-border-radius:4px;border-radius:4px}

  222. .listingblock pre.prettyprint{border-width:0}

  223. .listingblock>.content{position:relative}

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  226. .listingblock.terminal pre .command:before{content:attr(data-prompt);padding-right:.5em;color:#999}

  227. .listingblock.terminal pre .command:not([data-prompt]):before{content:"$"}

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  238. .quoteblock blockquote:before{content:"\201c";float:left;font-size:2.75em;font-weight:bold;line-height:.6em;margin-left:-.6em;color:#7a2518;text-shadow:0 1px 2px rgba(0,0,0,.1)}

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  241. .quoteblock .quoteblock{margin-left:0;margin-right:0;padding:.5em 0;border-left:3px solid rgba(0,0,0,.6)}

  242. .quoteblock .quoteblock blockquote{padding:0 0 0 .75em}

  243. .quoteblock .quoteblock blockquote:before{display:none}

  244. .verseblock{margin:0 1em 1.25em 1em}

  245. .verseblock pre{font-family:"Open Sans","DejaVu Sans",sans;font-size:1.15rem;color:rgba(0,0,0,.85);font-weight:300;text-rendering:optimizeLegibility}

  246. .verseblock pre strong{font-weight:400}

  247. .verseblock .attribution{margin-top:1.25rem;margin-left:.5ex}

  248. .quoteblock .attribution,.verseblock .attribution{font-size:.9375em;line-height:1.45;font-style:italic}

  249. .quoteblock .attribution br,.verseblock .attribution br{display:none}

  250. .quoteblock .attribution cite,.verseblock .attribution cite{display:block;letter-spacing:-.025em;color:rgba(0,0,0,.6)}

  251. .quoteblock.abstract{margin:0 0 1.25em 0;display:block}

  252. .quoteblock.abstract blockquote,.quoteblock.abstract blockquote p{text-align:left;word-spacing:0}

  253. .quoteblock.abstract blockquote:before,.quoteblock.abstract blockquote p:first-of-type:before{display:none}

  254. table.tableblock{max-width:100%;border-collapse:separate}

  255. table.tableblock td>.paragraph:last-child p>p:last-child,table.tableblock th>p:last-child,table.tableblock td>p:last-child{margin-bottom:0}

  256. table.tableblock,th.tableblock,td.tableblock{border:0 solid #dedede}

  257. table.grid-all th.tableblock,table.grid-all td.tableblock{border-width:0 1px 1px 0}

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  259. table.grid-cols th.tableblock,table.grid-cols td.tableblock{border-width:0 1px 0 0}

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  261. table.grid-rows th.tableblock,table.grid-rows td.tableblock{border-width:0 0 1px 0}

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  263. table.grid-rows tfoot>tr>th.tableblock,table.grid-rows tfoot>tr>td.tableblock{border-width:1px 0 0 0}

  264. table.frame-all{border-width:1px}

  265. table.frame-sides{border-width:0 1px}

  266. table.frame-topbot{border-width:1px 0}

  267. th.halign-left,td.halign-left{text-align:left}

  268. th.halign-right,td.halign-right{text-align:right}

  269. th.halign-center,td.halign-center{text-align:center}

  270. th.valign-top,td.valign-top{vertical-align:top}

  271. th.valign-bottom,td.valign-bottom{vertical-align:bottom}

  272. th.valign-middle,td.valign-middle{vertical-align:middle}

  273. table thead th,table tfoot th{font-weight:bold}

  274. tbody tr th{display:table-cell;line-height:1.6;background:#f7f8f7}

  275. tbody tr th,tbody tr th p,tfoot tr th,tfoot tr th p{color:rgba(0,0,0,.8);font-weight:bold}

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  277. p.tableblock{font-size:1em}

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  280. ul li ol{margin-left:1.5em}

  281. dl dd{margin-left:1.125em}

  282. dl dd:last-child,dl dd:last-child>:last-child{margin-bottom:0}

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  285. ul.unstyled,ol.unnumbered,ul.checklist{margin-left:.625em}

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  290. ul.inline>li>*{display:block}

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  295. ol.upperalpha{list-style-type:upper-alpha}

  296. ol.lowerroman{list-style-type:lower-roman}

  297. ol.upperroman{list-style-type:upper-roman}

  298. ol.lowergreek{list-style-type:lower-greek}

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  300. .hdlist>table>tbody>tr,.colist>table>tbody>tr{background:none}

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  302. td.hdlist1{font-weight:bold;padding-bottom:1.25em}

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  304. .colist>table tr>td:first-of-type{padding:0 .75em;line-height:1}

  305. .colist>table tr>td:last-of-type{padding:.25em 0}

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  308. .imageblock.right,.imageblock[style*="float: right"]{margin:.25em 0 1.25em .625em}

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  312. .image.left,.image.right{margin-top:.25em;margin-bottom:.25em;display:inline-block;line-height:0}

  313. .image.left{margin-right:.625em}

  314. .image.right{margin-left:.625em}

  315. a.image{text-decoration:none;display:inline-block}

  316. a.image object{pointer-events:none}

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  319. sup.footnote a:active,sup.footnoteref a:active{text-decoration:underline}

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  327. .gist .file-data>table td.line-data{width:99%}

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  329. .big{font-size:larger}

  330. .small{font-size:smaller}

  331. .underline{text-decoration:underline}

  332. .overline{text-decoration:overline}

  333. .line-through{text-decoration:line-through}

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  335. .aqua-background{background-color:#00fafa}

  336. .black{color:#000}

  337. .black-background{background-color:#000}

  338. .blue{color:#0000bf}

  339. .blue-background{background-color:#0000fa}

  340. .fuchsia{color:#bf00bf}

  341. .fuchsia-background{background-color:#fa00fa}

  342. .gray{color:#606060}

  343. .gray-background{background-color:#7d7d7d}

  344. .green{color:#006000}

  345. .green-background{background-color:#007d00}

  346. .lime{color:#00bf00}

  347. .lime-background{background-color:#00fa00}

  348. .maroon{color:#600000}

  349. .maroon-background{background-color:#7d0000}

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  351. .navy-background{background-color:#00007d}

  352. .olive{color:#606000}

  353. .olive-background{background-color:#7d7d00}

  354. .purple{color:#600060}

  355. .purple-background{background-color:#7d007d}

  356. .red{color:#bf0000}

  357. .red-background{background-color:#fa0000}

  358. .silver{color:#909090}

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  361. .teal-background{background-color:#007d7d}

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  364. .yellow{color:#bfbf00}

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  370. .admonitionblock td.icon .icon-warning:before{content:"\f071";color:#bf6900}

  371. .admonitionblock td.icon .icon-caution:before{content:"\f06d";color:#bf3400}

  372. .admonitionblock td.icon .icon-important:before{content:"\f06a";color:#bf0000}

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  379. .conum:not([data-value]):empty{display:none}

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  381. h1,h2,p,td.content,span.alt{letter-spacing:-.01em}

  382. p strong,td.content strong,div.footnote strong{letter-spacing:-.005em}

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  384. p{margin-bottom:1.25rem}

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  387. .print-only{display:none!important}

  388. @media print{@page{margin:1.25cm .75cm}

  389. *{-webkit-box-shadow:none!important;box-shadow:none!important;text-shadow:none!important}

  390. a{color:inherit!important;text-decoration:underline!important}

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  393. abbr[title]:after{content:" (" attr(title) ")"}

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  395. thead{display:table-header-group}

  396. svg{max-width:100%}

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  400. #toc{border-bottom:1px solid #ddddd8!important;padding-bottom:0!important}

  401. .sect1{padding-bottom:0!important}

  402. .sect1+.sect1{border:0!important}

  403. #header>h1:first-child{margin-top:1.25rem}

  404. body.book #header{text-align:center}

  405. body.book #header>h1:first-child{border:0!important;margin:2.5em 0 1em 0}

  406. body.book #header .details{border:0!important;display:block;padding:0!important}

  407. body.book #header .details span:first-child{margin-left:0!important}

  408. body.book #header .details br{display:block}

  409. body.book #header .details br+span:before{content:none!important}

  410. body.book #toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important}

  411. body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always}

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  416. .print-only{display:block!important}

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  425. .CodeRay .line-numbers strong{color:rgba(0,0,0,.4)}

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  573. <body class="article toc2 toc-left">

  574. <div id="header">

  575. <h1><a id="spring-boot-actuator"></a>Spring Boot Actuator</h1>

  576. <div id="toc" class="toc2">

  577. <div id="toctitle">Labs</div>

  578. <ul class="sectlevel1">

  579. <li><a href="#_code_snippet_manager_actuator">Code Snippet Manager Actuator</a>

  580. <ul class="sectlevel2">

  581. <li><a href="#_spring_boot_actuator_review_endpoints">Spring Boot Actuator: Review Endpoints</a></li>

  582. <li><a href="#_spring_boot_actuator_healthindicator">Spring Boot Actuator: HealthIndicator</a></li>

  583. <li><a href="#_challenges">CHALLENGES</a></li>

  584. <li><a href="#_homework">HOMEWORK</a></li>

  585. </ul>

  586. </li>

  587. </ul>

  588. </div>

  589. </div>

  590. <div id="content">

  591. <div id="preamble">

  592. <div class="sectionbody">

  593. <div class="paragraph">

  594. <p>Get familiar with the <strong>Spring Boot Actuator</strong> and its features.</p>

  595. </div>

  596. <div class="paragraph">

  597. <p><strong>Time:</strong> 20 minutes.</p>

  598. </div>

  599. <!-- toc disabled -->

  600. </div>

  601. </div>

  602. <div class="sect1">

  603. <h2 id="_code_snippet_manager_actuator">Code Snippet Manager Actuator</h2>

  604. <div class="sectionbody">

  605. <div class="paragraph">

  606. <p>You will continue with the <strong>Code Snippet Manager</strong> code. For this lab you will need the <strong>snippet-code-manager-jpa-rest</strong> project code. You will reuse the code from previous labs.</p>

  607. </div>

  608. <div class="olist arabic">

  609. <ol class="arabic">

  610. <li>

  611. <p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>

  612. </li>

  613. <li>

  614. <p>Click the <strong><em>Switch to the full version</em></strong> link.</p>

  615. </li>

  616. <li>

  617. <p>Fill out the <strong>Code Snippet Manager Actuator</strong> Project metadata with (See Figure 1.0):</p>

  618. <table class="tableblock frame-all grid-all spread">

  619. <caption class="title">Table 1. Code Snippet Manager Actuator - metadata</caption>

  620. <colgroup>

  621. <col style="width: 16.6666%;">

  622. <col style="width: 83.3334%;">

  623. </colgroup>

  624. <thead>

  625. <tr>

  626. <th class="tableblock halign-left valign-top">Property</th>

  627. <th class="tableblock halign-left valign-top">Value</th>

  628. </tr>

  629. </thead>

  630. <tbody>

  631. <tr>

  632. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>

  633. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>

  634. </tr>

  635. <tr>

  636. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>

  637. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-actuator</em></p></td>

  638. </tr>

  639. <tr>

  640. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>

  641. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-actuator</em></p></td>

  642. </tr>

  643. <tr>

  644. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>

  645. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet</em></p></td>

  646. </tr>

  647. <tr>

  648. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>

  649. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>Web, DevTools, Groovy Templates, JPA, Rest Repositories, H2, MySQL, Actuator, HATEOAS</em></p></td>

  650. </tr>

  651. <tr>

  652. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Spring Boot</strong>:</p></td>

  653. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>2.0.0.M7</em></p></td>

  654. </tr>

  655. </tbody>

  656. </table>

  657. <div class="paragraph">

  658. <div class="title">Figure 1.0: Spring Initializr - <a href="http://start.spring.io/" class="bare" target="_blank">http://start.spring.io/</a></div>

  659. <p><span class="image"><img src="images/08-spring-boot-actuator-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  660. </div>

  661. <div class="admonitionblock tip">

  662. <table>

  663. <tr>

  664. <td class="icon">

  665. <div class="title">Tip</div>

  666. </td>

  667. <td class="content">

  668. You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.

  669. </td>

  670. </tr>

  671. </table>

  672. </div>

  673. </li>

  674. <li>

  675. <p>Type <strong>Web</strong>, <strong>DevTools</strong>, <strong>Groovy Templates</strong>, <strong>JPA</strong>, <strong>Rest Repositories</strong>, <strong>H2</strong>, <strong>MySQL</strong>, <strong>Actuator</strong>, <strong>HATEOAS</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  676. </li>

  677. <li>

  678. <p>Click the <strong><em>Generate Project</em></strong> button.</p>

  679. </li>

  680. <li>

  681. <p>Unzip the file in any directory you want.</p>

  682. </li>

  683. <li>

  684. <p>Import your project in any IDE you want.</p>

  685. </li>

  686. <li>

  687. <p>Copy all the packages (with code) into the new project.</p>

  688. </li>

  689. <li>

  690. <p>The packages: <strong>domain</strong>, <strong>repository</strong> and <strong>config</strong> will remain with no change.</p>

  691. </li>

  692. </ol>

  693. </div>

  694. <div class="sect2">

  695. <h3 id="_spring_boot_actuator_review_endpoints">Spring Boot Actuator: Review Endpoints</h3>

  696. <div class="olist arabic">

  697. <ol class="arabic">

  698. <li>

  699. <p>In the <strong>src/main/resources/application.properties</strong>:</p>

  700. <div class="ulist">

  701. <ul>

  702. <li>

  703. <p>Enable all the endpoints</p>

  704. </li>

  705. <li>

  706. <p>Change the default path <strong>/actuator</strong>, instead use the path <strong>/admin</strong></p>

  707. <div class="listingblock">

  708. <div class="title">application.properties</div>

  709. <div class="content">

  710. <pre class="CodeRay highlight"><code data-lang="properties">management.endpoints.web.base-path=/admin

  711. management.endpoints.web.expose=*</code></pre>

  712. </div>

  713. </div>

  714. </li>

  715. </ul>

  716. </div>

  717. </li>

  718. <li>

  719. <p>Run the application and make sure all the endpoints are enable. Review all of them.</p>

  720. </li>

  721. </ol>

  722. </div>

  723. </div>

  724. <div class="sect2">

  725. <h3 id="_spring_boot_actuator_healthindicator">Spring Boot Actuator: HealthIndicator</h3>

  726. <div class="paragraph">

  727. <p>Using the same code, imagine that we are going to use a FileSystem to save some information. A specific path, by using the <strong>snippet.path</strong> property. We need to know:</p>

  728. </div>

  729. <div class="ulist">

  730. <ul>

  731. <li>

  732. <p>If the path doesn&#8217;t exists, report <strong><em>out of service</em></strong>.</p>

  733. </li>

  734. <li>

  735. <p>If the path exists but doesn&#8217;t have writing permissions, report <strong>system down</strong>.</p>

  736. </li>

  737. <li>

  738. <p>If the path exists and it has write permissions, report <strong>up</strong>.</p>

  739. </li>

  740. </ul>

  741. </div>

  742. <div class="olist blank">

  743. <ol class="blank">

  744. <li>

  745. <p>Let&#8217;s create a properties holder class. Add the <strong>SnippetProperties</strong> class in the <strong>io.pivotal.workshop.snippet.config</strong> package:</p>

  746. <div class="listingblock">

  747. <div class="title">io.pivotal.workshop.snippet.config.SnippetProperties.java</div>

  748. <div class="content">

  749. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.config</span>;

  750. 

  751. <span class="keyword">import</span> <span class="include">org.springframework.boot.context.properties.ConfigurationProperties</span>;

  752. 

  753. <span class="annotation">@ConfigurationProperties</span>(prefix = <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet</span><span class="delimiter">&quot;</span></span>)

  754. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetProperties</span> {

  755. 

  756.         <span class="directive">private</span> <span class="predefined-type">String</span> path;

  757. 

  758.         <span class="directive">public</span> <span class="predefined-type">String</span> getPath() {

  759.                 <span class="keyword">return</span> path;

  760.         }

  761. 

  762.         <span class="directive">public</span> <span class="type">void</span> setPath(<span class="predefined-type">String</span> path) {

  763.                 <span class="local-variable">this</span>.path = path;

  764.         }

  765. 

  766. }</code></pre>

  767. </div>

  768. </div>

  769. <div class="paragraph">

  770. <p>The above code will hold the information about the path with the property: <strong>snippet.path</strong>.</p>

  771. </div>

  772. </li>

  773. <li>

  774. <p>Create the <strong>SnippetHealthCheck</strong> class in the <strong>io.pivotal.workshop.snippet.actuator</strong> package:</p>

  775. <div class="listingblock">

  776. <div class="title">io.pivotal.workshop.snippet.actuator.SnippetHealthCheck.java</div>

  777. <div class="content">

  778. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.actuator</span>;

  779. 

  780. <span class="keyword">import</span> <span class="include">java.io.File</span>;

  781. 

  782. <span class="keyword">import</span> <span class="include">org.springframework.beans.factory.annotation.Value</span>;

  783. <span class="keyword">import</span> <span class="include">org.springframework.boot.actuate.health.Health</span>;

  784. <span class="keyword">import</span> <span class="include">org.springframework.boot.actuate.health.HealthIndicator</span>;

  785. <span class="keyword">import</span> <span class="include">org.springframework.stereotype.Component</span>;

  786. 

  787. <span class="annotation">@Component</span>

  788. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetHealthCheck</span> <span class="directive">implements</span> HealthIndicator {

  789. 

  790.         <span class="directive">private</span> <span class="predefined-type">String</span> path;

  791. 

  792.         <span class="directive">public</span> SnippetHealthCheck(<span class="annotation">@Value</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">${snippet.path:/tmp}</span><span class="delimiter">&quot;</span></span>)<span class="predefined-type">String</span> path){

  793.                 <span class="local-variable">this</span>.path = path;

  794.         }

  795. 

  796.         <span class="annotation">@Override</span>

  797.         <span class="directive">public</span> Health health() {

  798. 

  799.                 <span class="keyword">try</span> {

  800. 

  801.                         <span class="predefined-type">File</span> file = <span class="keyword">new</span> <span class="predefined-type">File</span>(path);

  802.                         <span class="keyword">if</span>(file.exists()){

  803. 

  804.                                 <span class="keyword">if</span>(file.canWrite())

  805.                                         <span class="keyword">return</span> Health.up().build();

  806. 

  807.                                 <span class="keyword">return</span> Health.down().build();

  808. 

  809.                         }<span class="keyword">else</span>{

  810.                                 <span class="keyword">return</span> Health.outOfService().build();

  811.                         }

  812.                 }<span class="keyword">catch</span>(<span class="exception">Exception</span> ex) {

  813.                         <span class="keyword">return</span> Health.down(ex).build();

  814.                 }

  815.         }

  816. 

  817. }</code></pre>

  818. </div>

  819. </div>

  820. <div class="paragraph">

  821. <p>Take a look at the constructor. If the <strong>snippet.path</strong> is not found, it will use the <strong>/tmp</strong> as default path.</p>

  822. </div>

  823. </li>

  824. <li>

  825. <p>In the <strong>src/main/resources/application.properties</strong> file add the following property:</p>

  826. <div class="listingblock">

  827. <div class="content">

  828. <pre class="CodeRay highlight"><code data-lang="properties">## Snippet

  829. snippet.path=/tmp/snippets</code></pre>

  830. </div>

  831. </div>

  832. <div class="admonitionblock tip">

  833. <table>

  834. <tr>

  835. <td class="icon">

  836. <div class="title">Tip</div>

  837. </td>

  838. <td class="content">

  839. Do not create this folder yet, we will make sure our custom health indicator works.

  840. </td>

  841. </tr>

  842. </table>

  843. </div>

  844. <div class="admonitionblock tip">

  845. <table>

  846. <tr>

  847. <td class="icon">

  848. <div class="title">Tip</div>

  849. </td>

  850. <td class="content">

  851. If you are using Windows try to use the <strong>C:/tmp/snippets</strong> or <strong>C:\\tmp\\snippets</strong> format.

  852. </td>

  853. </tr>

  854. </table>

  855. </div>

  856. </li>

  857. <li>

  858. <p>If you run the application and go to the <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a>, you should have something like the following Figure 3.0:</p>

  859. <div class="paragraph">

  860. <div class="title">Figure 3.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  861. <p><span class="image"><img src="images/08-spring-boot-actuator-03.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  862. </div>

  863. <div class="paragraph">

  864. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>OUT_OF_SERVICE</strong>.</p>

  865. </div>

  866. </li>

  867. <li>

  868. <p>Create the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong> for Windows) path but add/modify <strong>only read</strong> access, and then you can refresh the page, you should see the same as Figure 4.0:</p>

  869. <div class="paragraph">

  870. <div class="title">Figure 4.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  871. <p><span class="image"><img src="images/08-spring-boot-actuator-04.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  872. </div>

  873. <div class="paragraph">

  874. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>DOWN</strong>.</p>

  875. </div>

  876. </li>

  877. <li>

  878. <p>Modify the path to write access and refresh, you should have the following, see Figure 5.0.</p>

  879. <div class="paragraph">

  880. <div class="title">Figure 5.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  881. <p><span class="image"><img src="images/08-spring-boot-actuator-05.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  882. </div>

  883. <div class="paragraph">

  884. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>UP</strong>.</p>

  885. </div>

  886. </li>

  887. </ol>

  888. </div>

  889. </div>

  890. <div class="sect2">

  891. <h3 id="_challenges">CHALLENGES</h3>

  892. <div class="olist arabic">

  893. <ol class="arabic">

  894. <li>

  895. <p>Add a graceful shutdown to the application by executing the following command:</p>

  896. <div class="listingblock">

  897. <div class="content">

  898. <pre class="CodeRay highlight"><code data-lang="bash">curl -X POST localhost:8080/admin/shutdown</code></pre>

  899. </div>

  900. </div>

  901. <div class="admonitionblock tip">

  902. <table>

  903. <tr>

  904. <td class="icon">

  905. <div class="title">Tip</div>

  906. </td>

  907. <td class="content">

  908. If you are a Windows user, you can use the <strong>POSTMAN</strong> (<a href="https://www.getpostman.com/" class="bare" target="_blank">https://www.getpostman.com/</a>) application to execute the <strong>POST</strong>.

  909. </td>

  910. </tr>

  911. </table>

  912. </div>

  913. </li>

  914. </ol>

  915. </div>

  916. </div>

  917. <div class="sect2">

  918. <h3 id="_homework">HOMEWORK</h3>

  919. <div class="paragraph">

  920. <p>Review the Micrometer technology (<a href="http://micrometer.io" class="bare" target="_blank">http://micrometer.io</a>) and apply it to the Code Snippet Manager.</p>

  921. </div>

  922. </div>

  923. </div>

  924. </div>

  925. </div>

  926. <div id="footer">

  927. <div id="footer-text">

  928. Last updated 2017-12-01 09:15:44 PST

  929. </div>

  930. </div>

  931. </body>

  932. </html>