If you use LVM frequently enough, especially when re-using existing disks, you might come a cross a problem when you’re unable to create a physical volume from that disk. For example, here is what I encountered today when I tried to create a physical volume on a device called /dev/sdb. [root@db3 ~]# pvcreate /dev/sdb Device /dev/sdb excluded by a filter. I’m sure I haven’t had any filters in /etc/lvm/lvm.conf. ...
As the title says, an easy way to find out the path of a program/command on Windows using PowerShell can be done with Get-Command cmdlet. For example, I want to find out where I had installed nvim (Neovim) on a rarely use Windows machine. To do this, I can execute the following command: ❯ Gt-Command nvim CommandType Name Version Source ----------- ---- ------- ------ Application nvim.exe 0.0.0.0 C:\Program Files\Neovim\bin\nvim.exe With PowerShell, we can also just print a specific attribute (?) of an object. ...
It’s been quite a while since I last posted something here. It’s not that I haven’t come across many issues in tech, it’s just that I haven’t had enough time to write anything. So I’m going to share how to easily clear the ZFS metadata on a disk previously used in a ZFS pool. Here is an example - I have an external drive, and it is detected as /dev/da0 when plugged into a FreeBSD server. Though I don’t remember having used it as a member of a ZFS pool called tank, the following output does show that it is the case: ...
What was your first text editor when you started using Linux/Unix? Mine was pico. It was very easy to get started with and quite similar to nano. Then I moved to emacs and sticked with it for a long while. Eventually, I’ve switched to vim (or neovim), and that’s what I have been using until now. Well, the thing about text editor or may be this also applies to many other things, you’re only familiar with features that you constantly use. This means I only know a small subsets of what vim can do. ...
Recently I need to install a package called Lmod on a Red Hat 8 server. Lmod is available from RHEL 8 EPEL8 repository, however it has a dependency called lua-filesystem which is only available from codeready-builder repository. On my RHEL 8 server, the codeready-builder repository is not enabled by default. Here is how I’ve got Lmod installed manually: # subscription-manager repos --enable codeready-builder-for-rhel-8-x86_64-rpms # dnf install Lmod Looking at the above commands, I needed to enable the codeready-builder-for-rhel-8-x86_64-rpms first before installing Lmod. The thing is, I’m going to forget that Lmod requires lua-filesystem which is not available from the same repository as Lmod unless I write it down somewhere. Or better yet, let’s automate it with Ansible! ...