Oleksii Kravchenko kam1kaze

Creating a clean gh-pages branch

This is the sequence of steps to follow to create a root gh-pages branch. It is based on a question at [SO]

cd /path/to/repo-name
git symbolic-ref HEAD refs/heads/gh-pages
rm .git/index
git clean -fdx
echo "My GitHub Page" &gt; index.html

Moved to git-repository: https://github.com/denji/awesome-http-benchmark

Tools

Located in alphabetical order (not prefer)

ab – slow and single threaded, written in C
apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
autocannon – fast HTTP/1.1 benchmarking tool written in Node.js
baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)

Mosh (mobile shell) is a gift from the Gods(tm). Anyone with spotty internet or wireless connection has suffered the pain of a lost SSH session. Sure, one can fire up screen (or tmux as the kids are using these days), but that's an extra step and you are still using the SSH protocol.

I'm not here to tout the benefits of Mosh, you came here to open it up in your firewall.

Create the following file as /etc/firewalld/services/mosh.xml
firewall-cmd --add-service=mosh --permanent
firewall-cmd --reload

If you tend to have a lot of sessions (not recommended), you can increase the ports, but the default should be fine for most applications.

Last updated: 2017-03-18

Searching for Files

Find images in a directory that don't have a DateTimeOriginal

exiftool -filename -filemodifydate -createdate -r -if '(not $datetimeoriginal) and $filetype eq "JPEG"' .

###Output photos that don't have datetimeoriginal to a CSV### Note this can take a long time if you have a lot of jpgs

To remove a submodule you need to:

Delete the relevant section from the .gitmodules file.
Stage the .gitmodules changes git add .gitmodules
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Run rm -rf .git/modules/path_to_submodule (no trailing slash).
Commit git commit -m "Removed submodule "
Delete the now untracked submodule files rm -rf path_to_submodule

# View public IP

curl -s checkip.dyndns.org | sed 's#.Address: (.)</b.*#\1#'
wget -qO - icanhazip.com
curl ifconfig.me
curl ident.me
dig +short myip.opendns.com @resolver1.opendns.com
lynx -dump ifconfig.me | grep 'IP Address'
curl ipecho.net/plain
curl bot.whatismyipaddress.com
curl ipinfo.io

OpenVPN Server and certificate management on MikroTik

Troubleshooting of systemd and fsck on boot

I investigated some problems with fsck and systemd recently. In the process, I learned quite a few things. And when I finished, I wrote these notes for future reference. Hope somebody finds them useful.

Setup

Open grub config file with:

sudo vi /etc/default/grub

In order to see the system log on boot, remove quiet and splash from the kernel command line. Also, we want as much information as possible about systemd, so add the following params to the kernel command line:

	import javax.net.ssl.SSLParameters;
	import javax.net.ssl.SSLSocket;
	import javax.net.ssl.SSLSocketFactory;
	import java.io.*;

	/** Establish a SSL connection to a host and port, writes a byte and
	* prints the response. See
	* http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services
	*/
	public class SSLPoke {

	// A Declarative Pipeline is defined within a 'pipeline' block.
	pipeline {

	// agent defines where the pipeline will run.
	agent {
	// This also could have been 'agent any' - that has the same meaning.
	label ""
	// Other possible built-in agent types are 'agent none', for not running the
	// top-level on any agent (which results in you needing to specify agents on
	// each stage and do explicit checkouts of scm in those stages), 'docker',