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Prepare Ubuntu Server for Raspberry Pi

To find Raspberry Pi IP address

$ nmap -sn 192.168.1.0/24 #or arp -na | grep -i b8:27:eb

Enable WiFi using netplan (reference)

$ sudo nano /etc/netplan/50-cloud-init.yaml #OR edit file "system-boot/network-config" directly from SD card  

# edit somethings like this

network:
    ethernets:
        eth0:
            dhcp4: true
            optional: true
    version: 2
    wifis:
        wlan0:
            dhcp4: true 
            optional: true
            access-points:
                "SSID-NAME-HERE":
                    password: "PASSWORD-HERE"
                    
# then run these commands
$ sudo netplan generate
$ sudo netplan apply
$ ip a #to check ip address

Enable WiFi

# Connect to internet via lan first
$ sudo lshw -C network #to check 
$ sudo apt-get install wireless-tools
$ sudo apt-get install wpasupplicant
$ sudo nano /etc/network/interfaces #add followings

# The loopback network interface
auto lo
iface lo inet loopback

# The wireless network interface
allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
wpa-ssid My Wifi Name
wpa-psk yourPassword

$ reboot

Disable wpa_supplicant

$ sudo systemctl mask wpa_supplicant.service
$ sudo mv /sbin/wpa_supplicant /sbin/no_wpa_supplicant
$ sudo pkill wpa_supplicant

Change hostname

$ sudo nano /etc/hostname
# replace the old hostname with <custom hostname>
$ sudo nano /etc/hosts
# make sure that there are these 2 lines
# 127.0.0.1 localhost
# 127.0.1.1 <custom hostname>

$ reboot

Enable swapfile

$ sudo swapon --show #to check
$ sudo fallocate -l 4G /swapfile
$ sudo chmod 600 /swapfile
$ sudo mkswap /swapfile
$ sudo swapon /swapfile
$ sudo nano /etc/fstab #add followings
/swapfile swap swap defaults 0 0

#check 
$ sudo swapon --show
$ sudo free -h

#to remove
$ sudo swapoff -v /swapfile
# remove the line /swapfile swap swap defaults 0 0 from the /etc/fstab 
$ sudo rm /swapfile

Docker Installation

• Typical (Ubuntu/Raspbian most platforms except arm64)

$ curl -fsSL https://get.docker.com -o get-docker.sh
$ sh get-docker.sh

• Raspbian Buster

$ CHANNEL=nightly curl -fsSL https://get.docker.com -o get-docker.sh
$ sh get-docker.sh

• Ubuntu 20.04 LTS Server

$ sudo apt install docker.io docker-compose

• Ubuntu 18.04 LTS Server (Refer to Docker manual)

$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

$ sudo add-apt-repository \
   "deb [arch=arm64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
   
$ sudo apt-get update && sudo apt-get install docker-ce

Start Docker service (if not done by installer)

$ sudo systemctl enable docker
$ sudo systemctl start docker

# Check status
$ systemctl status docker

Add user to the docker group

$ sudo usermod -aG docker $USER #(reboot to take effect)

Simple test

$ docker version
$ docker run --rm hello-world
#For arm64
$ docker run --rm aarch64/hello-world

To use Portainer

$ docker volume create portainer_data
$ docker run -d -p 8000:8000 -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce

Then, access the service throught http://localhost:9000