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…
Cloud Infrastructure
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…
VirtualBox VM Inaccessible on Mac
Issue: "The selected virtual machine is inaccessible. Please inspect the error message shown below and press the Refresh button if you want to repeat the accessibility check." After saving states…
VirtualBox Delete Oldest Snapshot
Issue: Deleting the oldest snapshot of virtual machine in VirtualBox is often difficult, sometimes there is error with detail "more than one child hard disk". Solution: Open VirtualBox control panel,…
Demystify iCloud Sync
Issue: Uploaded keynote file to iCloud through safari, after a day the iPad still could not see it when clicking the "+" sign at top left corner of Keynote in…
Google Chrome Not Start Only Flicking
Issue: Starting Chrome in Windows 7 guest from Virtualbox happens to see only flicking windows with flashing rate around 2-4 rounds per sec. Solution: Turn off hardware acceleration in Chrome…
Amazon EC2 Total Connection Lost
Background: Trying to set up another Drupal site on free tier of Amazon cloud, the feeling and setup are all good! After setting up LAMP stack, suddenly received an email…
Migrating Windows Physical Machine to VirtualBox
Background: As more depending on iPad (now iPad mini), few tasks are to be done on my current notebook PC, Acer Aspire 1810Z running Windows 7 Home Premium. Rebuild desktop…
Migration Xen to VMware to VirtualBox for Linux
Issue: Xen migrates to VMware Player for the following reasons: its guests are with less interactive control than other virtualization like VMware or Virtualbox, e.g. mouse control, full screen auto-resize,…