CentOS VM Client Can’t Boot Up
Issue VirtualBox client CentOS can't boot up with error message: [FAILED] Failed to start Virtual Machine and Container Registration Service. [FAILED] Failed to start Login Service. Solution Disable SELINUX config…
Jupyter Notebook on Boot Automatically
Issue After making the file to create a system service for jupyter notebook running on CentOS so as to start jupyter server automatically during system start up, the service successfully…
PHP 7
PHP 7 & Related Issues
Background After installing a WordPress plugin - WP Health, it's reminded that PHP5 had no longer been supported since late 2018, thus there may be risk in all WordPress websites.…
Centos7 Virtualmin Upgrade PHP7 MariaDB
This is my first blog after upgrading to WordPress 5.1 from ver.4.8. Yes, I never tried 5.0 as it's always risky to have a major upgrade to ver. x.0. The…
Cannot launch or remove iTunes from Mac High Sierra
Issue: when launching iTunes, it closed immediately after clicking the icon and appeared in half a second, then error screen appeared to ask for "ignore", "report", etc. Solution: Finder ->…
Mail Server Already Exists error iPhone iOS 11
Issue: When open an email box, error appeared on iPhone warning: Cannot verify Mail Server Identity. One solution for this problem is to delete that mail account on iPhone and…
WordPress Duplicator Plugin Server Error 500
Issue: During scanning stage of running the Duplicator plugin on a WordPress site, there was an error: Server Error 500. Solution: Modify /etc/php.ini file to increase memory: memory_limit = 256M…
WP Fastest Cache Plugins Update Issue
Issue: After installing WP Fastest Cache plugin, whenever update any plugin, there is error - Update failed. Could not remove old plugin. Solution: Go to WPFC at the top bar…
hsla HTML Color Scheme
Just learnt how to use hsla (hue, saturation, light, alpha) html color scheme from Castro's HTML5 and CSS3. I found it's beauty that it is more logical to think of various…
Scrolling to Section ID Missing
Issue: When moving some of the content to a single page design, the menu link will be addressing the div id instead of another page. But after all set up…