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<p><a href="solutions-building.html">Build solutions in BRIX</a> > <a href="portable-microservices.html">Portable services in modules</a> / Example of using a Readiness probe in portable services</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Example of using a Readiness probe in portable services</span></h1>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">This article shows an example of implementing a <a href="https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/" target="_blank" class="weblink">Readiness probe</a> based on HTTP requests.</span></p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">начало внимание</span></p>
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<p style="line-height: 1.20; margin: 7px 0 7px 0;"><span style="font-family: Inter;">This article does not include recommendations on how to define whether you need a Readiness probe.</span></p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">конец внимание</span></p>
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<h2 class="p_Heading2"><span class="f_Heading2">Basic information about the case</span></h2>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">This is a module that includes two portable services. Service #1 can send information about its state via HTTP requests. Service #2 can interpret its responses or absence of responses.</span></p>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">We need to configure Service #2 so that it doesn’t accept incoming traffic when Service #1 is in a certain state.</span></p>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">We have decided to do it using a Readiness probe.</span></p>
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<h2 class="p_Heading2"><span class="f_Heading2">Modification of Service #2</span></h2>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">We need to define how Service #2 processes the HTTP request that retrieves the status of Service #1.</span></p>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">From the </span><code><b>SERV1URL</b></code><span style="font-family: Inter;"> environment variable, the address of Service #1 is retrieved. An HTTP request is sent to this service. If the response status code is 200, and the response body meets the conditions of the probe set up in Service #2, the method we added returns status 200. Otherwise, it returns 504.</span></p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">func readnessFunc(w http.ResponseWriter, r *http.Request) {</span><br />
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<span class="f_CodeExample" style="font-weight: bold;">if</span><span class="f_CodeExample"> serv1URL, exists := os.LookupEnv("SERV1URL"); exists {</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">response, err := http.Get(serv1URL + "/getstatus")</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample" style="font-weight: bold;">if</span><span class="f_CodeExample"> err == nil &&</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">response.StatusCode == 200 &&</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">isValidStatus(response.Body) {</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">fmt.Fprintf(w, "Yeah, it works")</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample" style="font-weight: bold;">return</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">}</span><br />
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<span class="f_CodeExample">}</span><br />
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<span class="f_CodeExample">w.WriteHeader(http.StatusGatewayTimeout)</span><br />
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<span class="f_CodeExample">}</span></p>
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<h2 class="p_Heading2"><span class="f_Heading2">Configure Service #2</span></h2>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">When the image of Service #2 is built and uploaded, we need to configure the Readiness probe in BRIX. To do that, we need to:</span></p>
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<ol style="list-style-type:decimal">
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<li value="1" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">In the module’s settings, open the </span><span style="font-family: Inter; font-weight: bold;">Services</span><span style="font-family: Inter;"> tab, then move on to editing Service #2. </span></li><li value="2" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">On the </span><span style="font-family: Inter; font-weight: bold;">Readiness</span><span style="font-family: Inter;"> tab, select </span><span style="font-family: Inter; font-weight: bold;">HTTP</span><span style="font-family: Inter;">.</span></li><li value="3" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Set a delay after which the probe is performed.</span></li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">начало внимание</span></p>
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<p style="line-height: 1.20; margin: 7px 0 7px 0;"><span style="font-family: Inter;">Don’t make the delay too short. Service #2 must have enough time to be initialized in the cluster to accept requests from probes. If the value of the delay is not enough, Service #2 may become unavailable.</span></p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">конец внимание</span></p>
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<ol style="list-style-type:decimal">
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<li value="1" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">In Service #2, specify the port and the path to the HTTP method used for the probe.</span></li><li value="2" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Pass information about the location of Service #1 to Service #2. To do that, go to the </span><span style="font-family: Inter; font-weight: bold;">Environment Variables</span><span style="font-family: Inter;"> tab and create a string named </span><span style="font-family: Inter; font-weight: bold;">SERV1URL</span><span style="font-family: Inter;"> with the URL of Service #1.</span></li><li value="3" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Specify the address of the service by clicking the </span><span style="font-family: Inter; font-weight: bold;">{+} </span><span style="font-family: Inter;">symbol on the right side of the string and select the service from the list. A value of the following format will be generated: </span><code><b>{$_srv_ServiceName#1}</b></code><span style="font-family: Inter;">.</span></li></ol>
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<h2 class="p_Heading2"><span class="f_Heading2">Additional information</span></h2>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">When developing and implementing a Readiness probe, note that it is performed all the time while Service #2 exists. In the example provided in this article, Service #2 will constantly send HTTP requests to Service #1.</span></p>
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