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Autostart XEN Domains

When using XEN you can start virtual machines using "xm create". However after rebooting the host machine, the virtual machines are not started automatically. This minor problem is easy to solve. Let's say the configuration for the virtual machine is in /etc/xen/pluto.cfg:

mkdir -p /etc/xen/auto
cd /etc/xen/auto
ln -s /etc/xen/pluto.cfg .
cd -

This creates a link to autostart the virtual machine. The source of the symlink must be an absolute path.

In addition to the symlink, the "pluto.cfg" file must contain the following entries:

on_xend_stop  = 'shutdown'
on_xend_start = 'start'

If you are using the "xm" toolkit, you can add these two lines to the template in /etc/xen-tools/xm.tmpl. After these changes, "pluto" starts when the host system starts.

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Greenplum Community Edition - Connections from the host system into the virtual machine

If you download the Greenplum Community Edition (GP CE) from the Greenplum website and if you want to connect tools like pgAdminIII from your host machine to the database inside the virtual machine, you have to disable the firewall. The CE is installed on CentOS and by default the firewall is enabled and blocks connections from outside to most ports. Continue reading "Greenplum Community Edition - Connections from the host system into the virtual machine"
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