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Basic Server Setup, Caddy, Docker, JDownloader

Creating the VM in oracle cloud.

  1. Go to instances, new instance.
  2. Select the Always Free image, ARM or x86. 1 core only, recommended 4GB RAM, should be exceed 6 GB.
  3. Choose Ubuntu image.
  4. Download the SSH key and name it accordingly.

Key Pair

Using PuttyGen.

  • Place the key in ./ssh/openssh_keys
  • Open PuttyGen, conversion -> import keys
  • Save the key files as ppk file in root folder of ./ssh

Putty

  • Grab the IP address in the cloud console
  • Give a name in saved sessions
  • Go to behavior, choose these options
  • Under Data, make sure Terminal-type string is xterm-256color
  • Under Terminal -> Features, check "disable application keypad mode" to fix issues with nano
  • The private key needs to be load in Connection -> SSH -> Auth -> Credentials

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To get the IP address of the VPS at any time 

curl ifconfig.me

Basic Setup + Docker

  1. Installing Caddy web server (simple to use reverse proxy), lightweight, easy and no need for docker. (Nginx is also a good candidate for reverse proxy as the command is easy to memorize and does not require consulting documentation sites. However, the syntax for nginx is extremely complex compared to caddy and might not be easily memorized.

https://caddyserver.com/docs/install#debian-ubuntu-raspbian

sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | sudo tee /etc/apt/sources.list.d/caddy-stable.list
sudo apt update
sudo apt install caddy net-tools
# net-tools is good utility, optionally can install firewall-cmd or nginx
# sudo apt install firewalld nginx

2. Install Docker

https://docs.docker.com/engine/install/ubuntu/

sudo apt-get update
sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
    
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
  
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin docker-compose
# code modified to install docker-compose, each space in paragraph indicates a separate step in their official blog
sudo groupadd docker \
sudo usermod -aG docker ubuntu
newgrp docker # activate docker group immediately

The machine needs to be rebooted from Oracle Cloud console to finish installation. 

JDownloader

https://hub.docker.com/r/jlesage/jdownloader-2

docker run -d \
    --name=jdownloader-2 \
    -p 5800:5800 \
    -v $HOME/appdata/jdownloader-2:/config:rw \
    -v $HOME/Downloads:/output:rw \
    --restart unless-stopped \
    jlesage/jdownloader-2

If port forwarding configured properly, entering ipaddress:5800 should work. If not open ports manually.

sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 5800 -j ACCEPT
sudo netfilter-persistent save

Other Useful Ports

sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 443 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 80 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 25565 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 19132 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p udp --dport 25565 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p udp --dport 19132 -j ACCEPT
sudo iptables -I INPUT 6 -m state --state NEW -p udp --dport 51820 -j ACCEPT
sudo netfilter-persistent save

Alternative (firewall-cmd)

sudo apt install firewalld

Firewalld is a CentOS package, it may be unstable and crash, but command easy to memorize.

sudo firewall-cmd --zone=public --add-port 19132/tcp --permanent
sudo firewall-cmd --zone=public --add-port 19132/udp --permanent
sudo firewall-cmd --zone=public --add-port 25565/tcp --permanent
sudo firewall-cmd --zone=public --add-port 25565/udp --permanent
sudo firewall-cmd --zone=public --add-port 80/tcp --permanent
sudo firewall-cmd --zone=public --add-port 443/tcp --permanent
sudo firewall-cmd --zone=public --add-port 5800/tcp --permanent
sudo firewall-cmd --reload

Troubleshooting network 

For firewall-cmd, use this command to check all open ports.

sudo firewall-cmd --list-all

Using netstat, or pipe it to grep

netstat -tln
# | grep 8080 etc...

Configuring JDownloader

  • Go to the JDownloader WebUI
  • Go to Settings 
  • Under general, change the max number of downloads (2) and DL per hoster (1) to minimize issues

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  • Go to MyJDownloader and configure MyJDownloader account

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  • Go to extension modules, install and enable "folderwatch"

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The configuration for JDownloader is complete and should appear and be functional in WebUI. Advanced JDownloader documentation will be covered in detailed in another section. It is recommended to close port 5800 after configuring to prevent others accessing.

Basic Caddy Syntax (if applicable)

If the server that is being setup or restored needs functional service like bookstack or uptime-kuma, reverse proxy is needed.

sudo nano /etc/caddy/Caddyfile
{
    email weebly2x10@gmail.com
}

your-uptime-kuma.yoursubdomain.duckdns.org {
        reverse_proxy http://127.0.0.1:3001
}

wiki.yoursubdomain.duckdns.org {
        reverse_proxy http://127.0.0.1:6975
}

Advanced

Tunneling Jellyfin and other web services with tailscale and caddy

Minecraft Server tunneling via Nginx (tcp only)

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