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Simple ExpressJS API to use local sendmail

API code

const express = require('express');
const nodemailer = require('nodemailer');
const app = express();

app.use(express.json());

// Configure Nodemailer to use the local sendmail service

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Setting up SSL cert with nginx

1. Copy the .crt file and encrypted .key file to nginx server
2. Decrypt the .key file

openssl rsa -in encrypted.key -out decrypted.key

4. Concatenate the .crt and and encrypted .key file

cat domain.crt encrypted.key > domain.pem

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Setting up sendmail relay on Ubuntu 22.04 (with PHP)

Test relay, needs host and port

One can use telnet to test; output will be similar to below. (use your email instead of joe@doe.com)

telnet 172.16.10.100 8081
Trying 172.16.10.100...
Connected to 172.16.10.100.
Escape character is '^]'.
220 mailagent.test.com ESMTP Postfix (Ubuntu)

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PopOS (Ubuntu based) Install Related Quirks

APT proxy

sudo vi /etc/apt/apt.conf.d/proxy.conf

#Add the following lines:

Acquire::http::Proxy "http://username:password@proxy-server-ip:8181/";
Acquire::https::Proxy "https://username:password@proxy-server-ip:8182/";

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• From - https://github.com/Kunena/Kunena-Forum/wiki/Create-a-new-branch-with-git-and-manage-branches

git checkout -b [name_of_your_new_branch]

• Push the branch on github :

git push origin [name_of_your_new_branch]

• When you want to commit something in your branch, be sure to be in your branch.

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Alfresco on Docker cheatsheet

Create PostgreSQL dump

# find postgresql container ID
sudo  docker ps | grep postgres | awk '{ print $1 }'

# open shell on container (replace container id)
sudo docker exec -it cb96ca00911e /bin/bash

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Installing Moodle on AWS LightSail

Start with a new LightSail Instance running Ubuntu 20.04

• Update

sudo apt update

• Install Apache

sudo apt-get install apache2

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Docker configuration behind HTTP or HTTPS proxy

Create http-proxy configuration file

sudo mkdir -p /etc/systemd/system/docker.service.d
sudo vi /etc/systemd/system/docker.service.d/http-proxy.conf

Add lines similar to the ones below and save file

[Service]
Environment="HTTP_PROXY=http://proxy.example.com:3128"

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Raspberry Pi - Getting hardware information

cat /proc/cpuinfo                             # CPU info
cat /sys/firmware/devicetree/model            # Model info
cat /proc/version                             # Software info
free -h                                       # RAM Details

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FFMPEG Cheat sheet

Compress MP4 files

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

Compressed file to better compatibility (WhatsApp)

ffmpeg -i broken.mp4 -c:v libx264 -profile:v baseline -level 3.0 -pix_fmt yuv420p working.mp4

Convert MOV to MP4