Category: Uncategorized

Activating Logical Volume on IO-Memory Device at Startup (Ubuntu 18.04 Bionic)

~ JJ Galvez ~ Leave a comment

For awhile I’ve had a problem with OSDs living on an fio device failing to start automatically after a reboot. The logical volume sitting on the device was not starting, eventually I checked udev.

The line to modify lives in lives in /lib/udev/rules.d/60-persistent-storage.rules.

KERNEL!="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*|scm*|pmem*|nbd*", GOTO="persistent_storage_end"

add fio* to the end of the list:

KERNEL!="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*|scm*|pmem*|nbd*|fio*", GOTO="persistent_storage_end"

Ubuntu Bionic (actually cloud-init) Reverting Hostname on Reboot

~ JJ Galvez ~ Leave a comment

If you’ve changed the hostname on an Ubuntu Bionic install, restarted the node, then found that the hostname has reverted you may be wondering why this has happened. The problem actually stems from the cloud-init scripts and the ‘preserve_hostname’ option.

root@ipa:~# grep -H -n preserve /etc/cloud/cloud.cfg
/etc/cloud/cloud.cfg:15:preserve_hostname: false

Go change the variable to true and the next time you change the hostname and reboot it will be left intact.