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Linux Administration: Install Docker on Ubuntu Server

Environment:

  • Windows Server 2019
  • Hyper-V
  • Ubuntu Server 20.04.3 LTS.

Configurations:

1. After Ubuntu Server is installed on a VM (with a clean and minimum installation without any preloaded packages), set up Docker and OpenSSH.

# Install OpenSSH
apt update -y
apt upgrade -y
apt install openssh-server -y

# Check SSH Status
systemctl status ssh

# Allow ssh over UFW firewall
ufw allow ssh

2. Enable UFW, check status, and configure rules.

# Enable UFW
ufw enable

# Check status and rules
ufw status

# Check status and make results numbered
ufw status numbered

# Disable UFW
ufw disable

# Block IP
ufw deny from IP-Address

# Block by subnet
ufw deny from IP/CIDR

# Block connections on interface
ufw deny in on eth0 from IP-Address

# Allow commands:
ufw allow from IP-Address
ufw allow in on eth0 from IP-Address

# Delete rule
ufw status numbered
ufw delete [number]

# Allow by protocol
ufw allow from IP-Address proto tcp to any port 22
ufw allow from IP/CIDR proto tcp to any port 22
ufw allow proto tcp from any to any port 80,443

3. Disable ipv6 on Ubuntu Server.

# Add
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
# to file /etc/sysctl.conf

4. Reduce Ubuntu shutdown time.

# Edit /etc/systemd/system.conf and uncomment DefaultTimeoutStopSec=90s and set it to a desired value

DefaultTimeoutStopSec=15s

5. Install Docker

# Remove existing Docker installations, if any
apt remove docker docker-engine docker.io containerd runc

# Install using the repository
apt update -y
apt install -y apt-transport-https ca-certificates curl gnupg lsb-release

# Add Docker's official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

# Set up stable repository
echo \
"deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" \
| sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker engine
apt update -y
apt install -y docker-ce docker-ce-cli containerd.io

# Verify that Docker Engine is correctly installed
docker version