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• Ensure that your Docker or Containerd environment meets the minimum deployment requirements.
• Open all required ports on the hosts, as list in Port Usage for Bare-Metal Hosts, in addition to the ports required for firewalls.
• Ensure that there are no other processes using port 53 on the host system on which your host will be deployed. For example, some Ubuntu systems running local DNS cache (system-resolved) might occupy port 53, and your host might not function properly in this case.
• Dind (Docker-in-Docker) configuration is not supported for host deployments.

For Red Hat 8.x and 9.x

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:

Execute the following commands:

yum install -y container-selinux selinux-policy-base
rpm -i https://rpm.rancher.io/k3s-selinux-0.1.1-rc1.el7.noarch.rpm

Then, disable nm-cloud-

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setup.service

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using the following command:

sudo systemctl disable nm-cloud-setup.service

After you install the required package, complete the following:

1. Disable the firewall service.
2. Enable the iptables service (if it exists).
3. Reboot the system.

For Ubuntu 18 and Ubuntu 20

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:

In which systemd-resolved is running, perform the following before deploying a host:

Stop systemd-resolved and remove the corresponding resolv.conf, as follows:

systemctl disable systemd-resolved.service

systemctl stop systemd-resolved

rm -f /etc/resolv.conf

Check and verify if the NetworkManager service exists by performing the following on the host:

systemctl status the NetworkManager

If the NetworkManager service exists, whether it is in the running or non-running state, stop the service by performing the following:

sudo systemctl stop NetworkManager.service

sudo systemctl disable NetworkManager.service

sudo systemctl stop NetworkManager-wait-online.service

sudo systemctl disable NetworkManager-wait-online.service

sudo systemctl stop NetworkManager-dispatcher.service

sudo systemctl disable NetworkManager-dispatcher.service

sudo systemctl stop network-manager.service

sudo systemctl disable network-manager.service

Set resolver, as follows:

tee /etc/resolv.conf << END

nameserver 8.8.8.8

END

• Disable unattended upgrades on Ubuntu. The unattended upgrades feature is enabled by default, and it runs at system boot without user's permission. Unattended upgrades could cause all containers to be terminated and new containers to be created. When this happens, the host will stay in a bad state and cannot be recovered. To disable unattended upgrades on Ubuntu and its derivatives, run the following command:

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• Install net-tools on the host using the following commands:
  • For Ubuntu:
    $ sudo apt-get install -y net-tools
  • For Redhat:
    $ sudo yum install net-tools -y

For Ubuntu 22 only:

• Edit the file –sudo vi /etc/default/grub:
  • Modify the values from GRUB_CMDLINE_LINUX=”” to GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=no"
  • If the above default values are not there, add the line GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=no"

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