2020 - Page 275 of 735

Apache HttpClient Example - CloseableHttpClient — step-by-step Web Servers tutorial on Progressive Robot

Apache HttpClient Example – CloseableHttpClient

Apache HttpClient can be used to send HTTP requests from client code to server. In our last tutorial, we saw how to use [HttpURLConnection](/community/tutorials/java-httpurlconnection-example-java-http-request-get-post "Java HttpURLConnection Example to send HTTP GET/POST Requests") to perform GET and POST HTTP request operations from java program itself. Today we will take the same example project but use Apache […]

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How to Configure DKIM, SPF and DMARC on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure DKIM, SPF and DMARC on RHEL 8

Email authentication standards — SPF, DKIM, and DMARC — are the primary tools used by receiving mail servers to verify that messages claiming to come from your domain actually originate from your authorized infrastructure. Without them, your outbound mail is far more likely to land in spam folders or be rejected outright. On RHEL 8, […]

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Android Toolbar Tutorial - XML Layout and Kotlin — step-by-step DevOps tutorial on Progressive Robot

Android Toolbar Tutorial – XML Layout and Kotlin

Android Toolbar widget is used to create menus in the apps. We will learn how to create a Toolbar using the XML layout and Kotlin code. We will implement various toolbar properties in an example Android app. What is Android Toolbar? Android Toolbar widget is generally found on the top of the screen. The application […]

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Common Problems 121182

Debian 10 – kernel panic after update due to incompatible third-party module

🔴 Critical   ⏱ 5–30 min  Last verified: 14 August 2020 Affected versions: Debian 10 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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Common Problems 113040

Windows Server 2016 — Persistent static route disappears after reboot — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 August 2020 Affected versions: Windows Server 2016 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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