Software RAID has come a long way. Unless you have some very high-rate, high-volume, I/O workloads with SLAs that will otherwise cost you money, for the most part a software RAID will perform just fine. One of the primary benefits of using software RAID is the portability of your disks/data. If a box on which you have a software RAID dies somehow and at least some (depending on your RAID configuration) of drives survive, you can easily resurrect the RAID → Continue reading “Setting up software RAID on Debian with mdadm”
Category: Software
[SOLVED] debsig-verify for Failed verification error, “signatures using the SHA1 algorithm are rejected” and “Can’t check signature: Invalid digest algorithm”
If you are using debsig-verify for the verification of a downloaded .deb file and are unable to verify it, run it with the -d option to get more information. If you see the following two lines
gpg: Note: signatures using the SHA1 algorithm are rejected
gpg: Can't check signature: Invalid digest algorithmIt is likely that the PGP signature used to sign the package uses the SHA1 algorithm which has been deprecated in most of the recent Linux distros. If → Continue reading “[SOLVED] debsig-verify for Failed verification error, “signatures using the SHA1 algorithm are rejected” and “Can’t check signature: Invalid digest algorithm””
LVM Resize – reduce the size of one logical volume to enable expanding another
I’m running an Ubuntu workstation and when setting it up simply went the “next-next-next” route when setting up the encrypted disk via LVM. The default is to create a 1G swap partition which is just not enough when you attempt to run too many things and locks up and/or crashes the machine.
My goal was to reduce my /root partition and then use that space to extend my swap partition.
Ensure that you back up your data first! There is → Continue reading “LVM Resize – reduce the size of one logical volume to enable expanding another”
Convert a Slice of Any Type to a CSV in Go
There are times, mostly for logging and debugging, when you have a slice of a given type that you would like to print to a log file or just convert to a CSV of values.
A quick and easy way to convert a slice to a CSV in Golang is to use the json module to Marshal it a JSON encoded array.
package main
import (
"encoding/json"
"fmt"
)
func main() {
ints := []int64{1, 2, 3, Earthly Cheat Sheet
I have just recently started using Earthly and the following is a list of commands that I want to keep track of
Caching
Completely clearing the cache: Earthly stores artifacts in docker volumes. If you want to completely flush that data and start fresh run the following
docker stop earthly-buildkitd && \
docker rm earthly-buildkitd && \
docker volume rm earthly-cachegit Cheat Sheet
A handful of handy git commands that I don’t use all that often but want to keep track of:
Stashing
Stash a single file
git stash push -m 'message here' -- path/to/fileDrop a specific stash
First figure out the id of the stash you want to drop with git stash list, then issue the following command
git stash drop stash@{n}
Add all untracked files across the entire repository
git add -AEditing Commits
Changing author of already pushed
→ Continue reading “git Cheat Sheet”Use printf to join an array in Bash
If you would like to join an array of elements with a defined delimiter in Bash there is an easy way to go about it by using printf. Following is an example
#!/bin/bash
declare -a arr=()
for i in `seq 1 5`
do
arr=("${arr[@]}" $i)
done
# Generate a single string joined by a comma. The printf string can contain
# any arbitrary delimiter.
printf -v joined '%s,' "${arr[@]}"
# Print out the string minus the trailing comma
echo Specifying a commit in go.mod instead of a local replace for development
Sometimes you are making changes to a dependency in another of your go projects and instead of adding a replace command in the go.mod file you want to update that entry in go.mod to point to a specific commit in the repo.
To do so, all that you need to do is:
- Get the git commit that you want included in your build
- Change directories to the same directory that your project’s
go.modfile resides in which you want to
Using Microsoft PowerRename to Rename Batches of Files
If you have to rename a large number of files under Windows it is very tedious to do it one-by-one via the gui. Instead of writing a batch file, Microsoft has a suite of tools called PowerToys. PowerToys installs a utility called PowerRename that will do the job.
I did this under Windows 10, but I imagine that it is the same in Windows 11 based on the documentation on the PowerToys installation page.
Installation
- Start a PowerShell as
Docker Cheat Sheet
Following are a number of my commonly used docker commands for my own reference
Building
Run the following in the same directory in which your Dockerfile resides
docker build -t <image-name>:<version> .Or you can specify the path to the Dockerfile
docker build . -t <image-name>:<version> -f /path/to/DockerfileRunning
Run a container interactively
Especially useful when debugging commands that you will encapsulate in a Docker file, this will enable you to run a base image and then execute commands interactively → Continue reading “Docker Cheat Sheet”