Introduction

We often need users to have access to specific commands without being root, and for cluster management, if you have dedicated administrators, it’s quite useful. Here’s a simple way to give them the necessary permissions…

Configuration

To give a user permissions to simply use cluster commands, here are the files to modify:

  • /etc/sudoers:
  # Cmnd alias specification
Cmnd_Alias     CLUSTAT          = /usr/sbin/clustat
Cmnd_Alias     CLUSVCADM        = /usr/sbin/clusvcadm
Cmnd_Alias     MOUNT            = /bin/mount
Cmnd_Alias     UMOUNT           = /bin/umount

# Defaults specification

# User privilege specification
root            ALL=(ALL) ALL
my_user          ALL=NOPASSWD:CLUSTAT,NOPASSWD:CLUSVCADM,NOPASSWD:MOUNT,NOPASSWD:UMOUNT
  • ~/.bashrc (for the user)
  # User specific aliases and functions
alias clustat='sudo /usr/sbin/clustat'
alias clusvcadm='sudo /usr/sbin/clusvcadm'
alias mount='sudo /bin/mount'
alias umount='sudo /bin/umount'

Usage

With my user account, I can simply run the commands and they will be executed as root:

  $ clustat
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Last updated 31 May 2007, 10:12 CEST. history