HowTo

One of the disks in my FreeBSD server reported an issue: Jul 14 18:00:56 nas kernel: GEOM: da0: the primary GPT table is corrupt or invalid. Jul 14 18:00:56 nas kernel: GEOM: da0: using the secondary instead -- recovery strongly advised. Jul 14 18:00:56 nas kernel: GEOM: diskid/DISK-67304734999999999999: the primary GPT table is corrupt or invalid. Jul 14 18:00:56 nas kernel: GEOM: diskid/DISK-67304734999999999999: using the secondary instead -- recovery strongly advised....

vdi file is a type of disk image used by VirtualBox. qcow2, on the other hand, is the format of disk image used by KVM. Recently, I want to move some existing virtual machines running on VirtualBox to KVM. To do that I need to convert the disk image from vdi to qcow2. Here’s one way to achieve that: Ref: How to convert VirtualBox vid to KVM qcow2

I just found out that git is not fully functional on my FreeBSD (11) box. It was installed from port (using portmaster git). I can clone a repo using SSH key, but not with HTTPS. I’m not quite sure if it’s always been this way. Here is how to fix it: Reinstall curl # pkg remove curl # portmaster curl Reinstall git # pkg remove git # portmaster git Why did I install git from port?...

Every time there is a new release of Linux distro, I need to create a bootable USB. And, I forgot how I did it last time. So, I tried by using the “Startup Disk Creator” program installed on my Ubuntu workstation, only to find out that it didn’t even work. After a while I remember, it was just a matter of using dd command to copy the ISO image to the USB....

As of today, the default storage for Docker on (K)Ubuntu 15.10 is AUFS. I want to switch it to OverlayFS. Personally, I’m still new to Docker, but I did hear that OverlayFS is better than AUFS. You can read more about OverlayFS here. Anyway, the purpose of this post is how to switch OverlayFS and avoid head-scratching. On Ubuntu 15.10 (wily), one can start/stop services either using Upstart or systemd. Since I want to get more accustomed to using systemd, I’ve been trying to use it anywhere possible....