n0 utility

The NodeZero host virtual machine comes with a script for setup and maintenancece of the host. To invoke it, type n0 into the command prompt and a menu like the one below will be presented.

$ n0

0) Version
1) Check environment
2) System info
3) Configure Static IP
4) Configure network proxy
5) Update
6) Set Timezone
7) Simple Network Scan
8) Set Hostname
9) Set NTP server
q) Exit

Choose an option: _

The following sections provide more information on what these options do.

Version Info

Prints the version of n0 being used

Check Environment

This runs NodeZero's checkenv.sh script to verify the host has the required configuration and settings as well as access externally to the required sites.

System Info

Displays basic system information about the host such as CPUs, Memory and Network settings

Example:

Configure Static IP / Configure DHCP

By default the NodeZero host virtual machine comes with DHCP enabled. The option here will toggle between Configure Static IP and Configure DHCP.

This defaults to Configure Static IP to switch from using DHCP to static ips. Once selected follow the prompts to configure a new IP address, Subnet, Gateway and DNS nameserver

If there is a need to switch back to DHCP, it can be selected with same option number which will show Configure DHCP

Configure Network Proxy

To have NodeZero use a proxy for your network provide your proxy setting in the prompt. This command updates values for proxy settings in these files:

/etc/environment

/root/.docker/config.json

/etc/systemd/system/docker.service.d/http-proxy.conf

/etc/docker/daemon.json

For Changes To Take Effect

After setting the proxy, the user must logout and back in before the changes takes effect.

Update

This does three things:

Updates the underlying OS, mostly for getting the latest security patches
Pulls the latest h3-cli while preserving the current configuration
Updates the n0 utility itself.

Ensure Latest Updates

It is suggested to run the update option two times back-to-back to ensure the latest updates are retrieved and implemented

Set Timezone

Allows for setting the timezone on the host.

Simple Network Scan

This runs a simplified network scan using zmap against a the top used ports. This scan is throttled to 150 packets/sec and bandwidth is restricted to 2 Megabits/sec to prevent disrupting the network. This is not to be used to replace running a Segmentation Test which is much more comprehensive in scanning and detecting systems and services.

A complete list of the hosts found is located in ~/.h3/host_list.txt

Set Hostname

Easy way to change the hostname on the host

Set NTP server

Sets the NTP server in /etc/systemd/timesyncd.conf

Exit

Exits the prompt inface of n0