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Mounting LUKS root disk on Ubuntu 19.04 (if your current root disk is also encrypted)

I had some trouble mounting a LUKS device recently, so I decided to make this gist.

So, it looks like Ubuntu already does the job of doing luksopen on your device, so you don't have to worry about it.

In order to mount it, I had to:

1. Find the VG UUID of my drive with vgdisplay
2. Rename it to something else with vgrename

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MicroK8s

Installing and configuring MicroK8s

# You can find other channels at https://microk8s.io/docs/release-channels
snap install microk8s --classic --channel=1.14/stable

# use this to check microk8s status
microk8s.status

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Debugging techniques

TCPDUMP

tcpdump -i eth0 -s 1024 -A

Shows only packets from eth0, size of packet is 1024, -A prints ascii.

TCPDUMP and Docker for Mac

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Kubernetes the hard way - notes

Gcloud

Creating a project and linking billing

# Create project
gcloud projects create project-name --set-as-default
# List billing accounts

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Some articles

• Keep your vimrc file clean
• Learn vimscript the hard way
• Vim Tab Madness. Buffers vs Tabs
• Vim: you don't need NERDtree or (maybe) netrw
• vim tips and tricks
• How does the vim “write with sudo” trick work?
• Resizing windows - Learning the vi

Shortcuts

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My Teresa dev environment

Defaults:

• mysql user: teresa
• mysql password: foobar
• mysql database: teresa
• mysql namespace: mysql
• mysql helm name: mysql
• mysql service name: teresa

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# Making substitutions on files where a certain pattern is found
fgrep -r "<something>" . | awk -F : '{print $1}' | xargs sed -i "s/<something>/<something else>/g" $@

## Mac OS specifics

## Cleaning up Time Machine snapshots

tmutil listlocalsnapshots / | awk -F "." '{print $4}' | while read dt; do tmutil deletelocalsnapshots $dt; done

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// to compile: gcc -fno-stack-protector -o boverflow_strcpy boverflow_strcpy.c
// to run (test): ./boverflow_strcpy $(python -c "print 'a'*15")
#include <stdio.h>
#include <strings.h>

void foo(char *bar){
	char buffer[16];
	strcpy(buffer, bar);
	printf("%s", buffer);
}

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// To compile: gcc -fno-stack-protector -o boverflow_gets boverflow_gets.c
// To run (test): python -c "print 'a'*<some number>" | ./boverflow_gets
#include <stdio.h>
#include <string.h>

int main() {
	char buffer[16];
	gets(buffer);
	printf("%s", buffer);
	return 0;

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#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[]) {
	char *test = argv[1];
	int tt = (int)strlen(test);
	printf("%d", tt);
	return 0;
}