CentOS 7 Virtual Server Fails to Boot after YUM Update

Issue

After creating a CentOS 7 virtual server, YUM update and rebooting cause failure to boot the virtual server. The log shows the following message:

"Fatal: VM was not running 1 minute after being started"

CODE

Environment

All OnApp versions

CentOS 7 virtual servers built from OnApp template (possibly any VS upgraded/installed to CentOS 7)

Resolution

There is a missing line for the default kernel in /boot/grub/grub.conf. The first entry should be the same as the old entry, and the missing line should resemble the following:

initrd /boot/initramfs-<kernel release>.img

CODE

Example lines from /etc/grub.conf:

title CentOS Linux (3.10.0-229.1.2.el7.x86_64) 7 (Core) 
        root (hd0,0) 
        kernel /boot/vmlinuz-3.10.0-229.1.2.el7.x86_64 root=/dev/xvda1 console=tty0 ro vconsole.keymap=us vconsole.font=latarcyrheb-sun16 LANG=en_US.UTF-8 
        initrd /boot/initramfs-3.10.0-229.1.2.el7.x86_64.img

CODE

Fix this issue from the recovery mode. Mount the failed VS disk and edit the file using the vi or other text editors.

Additional Information

CentOS 7 template has a custom kernel from OnApp that has missing features to make the VNC console work. The default updated kernel installed with YUM update is not guaranteed to work with the console and can leave the VNC console blank/black.