August 2020 - Page 34 of 62

How to Install Keepalived for High Availability on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Keepalived for High Availability on Debian 10

Introduction How to Install Keepalived for High Availability on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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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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