Kenno's Open Note

Deleting old LVM devices file PVID <ID> last seen not found

On one of my servers, I used to have a storage device, /dev/sdb, attached to it. That storage was used as an LVM physical volume. It has later been removed, and now I just noticed the following message: [root@banan ~]# lvs Devices file PVID CuDRE3nMN5FMNqYLViHrnE1D7OFDlbX6 last seen on /dev/sdb not found. LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root almalinux -wi-ao---- <28.40g swap almalinux -wi-ao---- 2....

Rustup - update and remove Rust toolchain

rustup is a utility used to install and remove rust toolchain. To list the current installed toolchain run: kenno@c2:~$ rustup show Default host: aarch64-unknown-linux-gnu rustup home: /home/kenno/.rustup installed toolchains -------------------- stable-aarch64-unknown-linux-gnu (default) 1.70.0-aarch64-unknown-linux-gnu 1.71.1-aarch64-unknown-linux-gnu 1.72.0-aarch64-unknown-linux-gnu active toolchain ---------------- stable-aarch64-unknown-linux-gnu (default) rustc 1.72.0 (5680fa18f 2023-08-23) To remove a specific version of the toolchain, e.g. 1.70.0-aarch64-unknown-linux-gnu run: kenno@c2:~$ rustup toolchain remove 1.70.0-aarch64-unknown-linux-gnu info: uninstalling toolchain '1.70.0-aarch64-unknown-linux-gnu' info: toolchain '1.70.0-aarch64-unknown-linux-gnu' uninstalled Let’s verify:...

Array in Bash

I have written a hand full of Bash scripts, but none of those utilized array. Why? It’s because of two main things: 1. I don’t know how to use array in Bash, and 2. I would normally switch to write the script in Python instead. Today, however, I need to update an existing script written in Bash to make use of array. This was a perfect excuse for me to spend some 30 minutes to learn about array in Bash....

Install Guest Tools on XCP-ng

On AlmaLinux, the guest-tool for XCP-ng is provided by a package named xe-guest-utilities-latest, which in turn is available from the epel-release repository. The following list a few steps to get XCP-ng guest-tool installed on a VM running AlmaLinux 9. Enable epel-release repository if not yet enabled by first installing a package called epel-release. In my case, the repo has been already enabled. [root@xoa1 ~]# rpm -q epel-release epel-release-9-7.el9.noarch Install the guest-tool....

What is in a Longhorn volume?

Do you know? Well, before today, neither did I. I’m pretty late to Kubernetes. I heard about it many hears ago, but unfortunately, I had no need to use it at home or at work. Even today, there is no workload that requires a Kubernetes cluster to run on. However, I think I can’t ignore Kubernetes any longer, and I need to learn about it now, well “better be late than never”, right?...

warning: TERM environment variable set to 'tmux-256color'

I use ’tmux’ on anything that runs it, from FreeBSD, macOS and Linux. On some of my Linux servers, noticeably openSUSE ones, when I connect to them via SSH, I would receive the following warning: ... Have a lot of fun... warning: Could not set up terminal. warning: TERM environment variable set to 'tmux-256color'. warning: Check that this terminal type is supported on this system. warning: Using fallback terminal type 'ansi'....

Grow partition with growpart

During the upgrade of Fedora 38 to Fedora 39 (beta) on my main desktop, the first attempt failed due to insufficient free disk space on the root volume. After some manual intervention such as vacuuming the journald logs, I was able to perform the successful upgrade. Not that it matters, but I’m writing this blog post on the same desktop running Fedora 39 Beta. This post is to record how I increase the root volume on my desktop with the help of a few tools such as growpart, lsblk, resize2fs,…etc....

How to delete Lightsail resources using AWS CLI

In this post, I’ll document how to use AWS CLI to delete a few Lightsail resources. I have never done this before, so this would be a good exercise for me. To make it less boring, I’m writing this post while I’m deleting these resources. First step, I need to look for the instance name [1]. ❯ aws lightsail get-instances --query 'instances[].name' [ "WordPress-1" ] The above output is the name of the instance I’d like to delete....

How to delete Memcached cluster using AWS CLI

If you have an ElastiCache Memcached cluster that you no longer need, it’s better to delete it. Dno’t believe me? Even AWS said so too: It is almost always a good idea to delete clusters that you are not actively using. Until a cluster’s status is deleted, you continue to incur charges for it. [1] Well, I have a Memcached cluster that I don’t need anymore. But instead of deleting this cluster using AWS console [1], I’m going to do this via AWS CLI....

Deleting VPC Endpoints With AWS CLI

This is a quick note on how to delete VPC endpoints that are no longer needed with AWS CLI. First, we need to find all the vpc-endpoints-ids [1]. ❯ aws ec2 describe-vpc-endpoints --query 'VpcEndpoints[].VpcEndpointId' [ "vpce-097008f8d26caxxxx", "vpce-07aaeabdefd8xxxx", "vpce-0bc6d548ff2e0xxxx" ] Note: I replaced the last 4 digit with ‘xxxx’. It’s a good idea to try out without really deleting the VPC endpoints by supplying --dry-run to the command below: ❯ aws ec2 delete-vpc-endpoints --vpc-endpoint-ids vpce-097008f8d26caxxxx vpce-07aaeabdefd8xxxx vpce-0bc6d548ff2e0xxxx --dry-run An error occurred (DryRunOperation) when calling the DeleteVpcEndpoints operation: Request would have succeeded, but DryRun flag is set....