DEV Community: Andrea Pavone

Cloudflare as a Dynamic DNS🌩

Andrea Pavone — Sun, 07 Mar 2021 19:22:39 +0000

If you need to have a DNS record that point to a Dynamic IP (DDNS), for example, you home IP address, this tool allow you to accomplish this job!

For do this this we need cloudflare-dynamic-ip tool allow you to simply have a specific DNS record such as home.example.com that point to your dynamic IP.

Requirements

Domain Name
Cloudflare Account
Raspberry Pi4 or any other Linux Based OS
composer
php-7.3

Installation

Clone the Github repo, install dependencies, set API Token and set a cron job every 15min that run this script and you’re done!🚀

git clone https://github.com/andp97/cloudflare-dynamic-ip.git
cd cloudflare-dynamic-ip
INSTALL_PATH=$(pwd)
composer install --no-dev
nano .env
echo -e "*/15 * * * * $INSTALL_PATH/cf-ip 2>&1 > /dev/null\n"
crontab -e

You can also execute this script via bash

#Get dns record name from env and target ip from remote host (https://ip.andreapavone.com) 

./cf-ip

#Passing parameters to the script

./cf-ip <dns_record_name> <target_ip>

On .env file you can set:

CLOUDFLARE_TOKEN (see how can you generate token here: https://support.cloudflare.com/hc/en-us/articles/200167836-Managing-API-Tokens-and-Keys)
CLOUDFLARE_ZONE_NAME or CLOUDFLARE_ZONE_ID
DNS_RECORD_NAME is the subdomain that you prefer to use (for example: home.example.com). If you prefer to be safer use a randomized token for the DNS_RECORD_NAME

Update

git pull
composer update

Docker high disk space usage 💾 📈

Andrea Pavone — Sun, 24 Jan 2021 16:16:51 +0000

Did you find an heavy disk space usage on your server and you don't know what is the root cause?

If you do some tests with Docker or you're running some containers on your machine, the cause of this abnormal disk space usage might be just Docker 🐋!

For example on my Raspberry Pi 4 I've seen an heavy space usage on /var/lib/docker/ directory, specially on overlay2:

root@rpi4:/home/user# du -h -d 1 /var/lib/docker/
2,6M    /var/lib/docker/image
15G     /var/lib/docker/overlay2
5,2M    /var/lib/docker/containers
...
17G     /var/lib/docker/

To fix this issue you can employ this command docker system prune see an example:

root@rpi4:/home/user# docker system prune
WARNING! This will remove:
  - all stopped containers
  - all networks not used by at least one container
  - all dangling images
  - all dangling build cache

Are you sure you want to continue? [y/N] y
Deleted Containers:
64086f34849c92aa2aed8a8757d7c395fbd4a2d77103174bd23a9efc8e0ec333
7be7eda3b32971f39cf08629eaf6d8f42c2677d02f220e0a09a4d955fb0ff5bb
aef03c9d804ae46ed17fa3ecd602a6d335f810a025204f208b3d78186ef26864

Total reclaimed space: 14.04GB

Do you want more information or simply read this article in original language (Italian 🇮🇹)?

IP Camera NVR for Home surveillance with [Docker 🐋️ + Raspberry 🍓️ + S3] in just 5min🚀️!

Andrea Pavone — Fri, 24 Apr 2020 22:35:47 +0000

In this article we're going to configure a NVR server for saving home IP Camera video on Raspberry PI 4 and keep a copy of them on AWS S3 Storage.

1. Install Docker on RaspberryPi

sudo su -
curl -fsSL https://get.docker.com -o get-docker.sh
sh get-docker.sh
usermod -aG docker pi
systemctl status docker
● docker.service - Docker Application Container Engine

2. Download Kerberos.io container and run them

docker pull kerberos/kerberos
docker run --name camera1 -p 80:80 -p 8889:8889 -d kerberos/kerberos

Double check, container is running correctly?

docker ps

CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS                                            NAMES
aef03c9d804a        kerberos/kerberos     "sh /run.sh"        10 days ago         Up 10 days          0.0.0.0:80->80/tcp, 0.0.0.0:8889->8889/tcp       camera1

3. Kerberos.io configuration

Go to http://your_raspberry_ip/ follow the configuration step and set admin user/password. (Currentrly this app support only 1 user)
Login
Go to Configuration
Set the RTSP camera URL, resolution and frame rate. (Most common camera rstp URL)
Open the Dashboard and see the Live Stream from your camera and the lastest records activities
Go to Configuration > Advanced > S3 and set Bucket, folder, publicKey and privateKey

Do you like Kubernetes?
You can deploy Kerberos on Kubernetes

See Other...