Jaime Frutos Morales's blog

17/09/2010

How to automatically start KVM virtual machines on boot

Filed under: Linux, SysAdmin, Virtualization — acidborg @ 13:18

Description: when you have a host machine running KVM and it runs several guests (virtual machines), it’s very useful to make them start on boot so that you don’t have to start them manually.

Steps:
Just execute the following command for each guest you want to autostart on boot: virsh autostart guest_name .

02/09/2010

How to synchonize your Ubuntu 10.04 desktop with a NTP server

Filed under: SysAdmin, Ubuntu — acidborg @ 12:21

Description: On my previous post, I explained how to install and configure a NTP server on your local network. Now I’m going to explain how to synchronize an Ubuntu 10.04 computer with your local NTP server.

Installation: apt-get install ntpdate

Configuration:

  1. Create the file /etc/cron.d/ntpdate.cron with the following content (modifying “your-ntp-server” with the name or IP address of your NTP server):
    15 */1 * * * root /usr/sbin/ntpdate your-ntp-server &> /dev/null
  2. This will synchronize your computer’s clock with the NTP server every hour. If you want to increase the synchronization period, increase the “/1”. For example: Use 15 */6 * * * root /usr/sbin/ntpdate your-ntp-server &> /dev/null to synchronize your computer’s clock every 6 hours.
  3. Set the proper owner and permissions for the created file: chmod 600 /etc/cron.d/ntpdate.cron && chown root:root /etc/cron.d/ntpdate.cron

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