Skip to content

Latest commit

 

History

History
33 lines (25 loc) · 1.99 KB

03-compute.md

File metadata and controls

33 lines (25 loc) · 1.99 KB
Raw

Adding/Removing a Compute Node

This page describes the steps to add or remove a compute node from an existing SCEPTRE cluster.

Assumptions:

  • A SCEPTRE cluster has already been installed.
  • For adding: Compute node has the necessary connections and system packages
  • For removing: Compute node is still connected to the minimega mesh or is accessible via SSH.

Adding a compute node

  • Verify the compute node is successfully connected to the CTL and TDN networks.
  • Verify the necessary packages are installed on the compute node.
  • Verify the user on the compute node has sudo privileges WITHOUT using a password (See NOTE below).
  • From the headnode, connect the new compute node to the minimega mesh (in the command below, replace NEW_COMPUTE with the hostname of the new compute node and replace USERNAME with the username of the new compute node): 
    sudo minimega -e deploy launch NEW_COMPUTE USERNAME sudo
  • Verify the new compute node is connected to minimega mesh: 
    sudo minimega -e mesh list

NOTE: To allow USERNAME to use sudo without a password (replace USERNAME with the username of the new compute node), first open the sudoers file using: sudo visudo. Next add the following entry for USERNAME to the bottom of the file: USERNAME ALL=(ALL) NOPASSWD:ALL. Finally, save and close the file.

Removing a compute node

  • Verify there are no VMs running on the node.
  • From the headnode, remove the compute node from the minimega mesh (in the command below, replace COMPUTE with the hostname of the compute node to be removed): 
    sudo minimega -e mesh send COMPUTE quit