alpenfritz

Node.js TLS plain TLS sockets

This guide shows how to set up a bidirectional client/server authentication for plain TLS sockets.

Newer versions of openssl are stricter about certificate purposes. Use extensions accordingly.

Prepare certificates

Generate a Certificate Authority:

alpenfritz

Table of Contents

• set -e, -u, -x, -o pipefail
• set -e
• set -x
• set -u
• set -o pipefail
• Setting IFS
• Original Reference

set -e, -u, -x, -o pipefail

alpenfritz

https://unix.stackexchange.com/questions/125382/migrate-socat-init-script-to-systemd
For socat, I use a pure systemd approach. This is an example for a serial loopback:

[Unit]
Description=Socat Serial Loopback
#Before=my-other.service

[Service]
Type=simple

alpenfritz

How to use different ssh deploy keys for multiple private github repositories with Go Modules

Let's assume you are using Go Modules and have a go.mod file that contains multiple private repos each with a different ssh key. How can you get go mod download to do the right thing -- i.e. use ssh key A with private repo A and ssh key B with private repo B?

Ok, here we go!

Let's assume you have some github.com user with multiple private repos:

https://github.com/someuser/private-repo-1

alpenfritz

A few show tricks to find slow queries in mongodb

Enable profiling

First, you have to enable profiling

> db.setProfilingLevel(1)

Now let it run for a while. It collects the slow queries ( > 100ms) into a capped collections, so queries go in and if it's full, old queries go out, so don't be surprised that it's a moving target...

alpenfritz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

alpenfritz

Default

Powerlevel9k

alpenfritz

// var chores = function () {
//   var tasks = ['laundry', 'dishes', 'vaccuum', 'dust'];
  
//   return {
//       doChores: function () {
//         console.log(tasks.pop());
//       },
//       addChores: function (task) {
//         tasks.push(task);
//         return task;