Changes between Initial Version and Version 1 of Software/eAM/ePXE

Timestamp:

Apr 18, 2007, 5:43:37 PM (19 years ago)

Author:

mcgrof

Comment:

—

Software/eAM/ePXE

@@ +1 @@
+
+Go back --> [wiki:Documentation] --> [wiki:Documentation/orbit-pxe]
+
+== Loading Orbit-PXE ==
+
+Whether you are imaging a node, saving a node image or doing inventory control Orbit nodes get orbit-pxe image loaded first into RAM. The way this is accomplished is by having the PXE server make a symbolic link of the node's IP address in hex to the orbit-pxe configuration file on the TFTP server. By default PXE configuration is to have the node boot off its local hard disk.
+
+/tftpboot/pxelinux.cfg/default
+
+{{{
+default harddisk
+
+label harddisk
+  localboot 0
+}}}
+
+When orbit-pxe is to be loaded the nodehandler first tells the PXE server to set the symbolic link up to the orbit-pxe configuration. It does this by issuing a GET request to the the following URL to the PXE server:
+
+{{{
+http://pxe:5012/pxe/setBootImage?img=<image name>&node=<node ID>&ip=<ip address of node>
+}}}
+
+The PXE server in turn then creates a symbolic link for the respective IP address in hex. For example, if the node has an IP address of 10.18.1.2 (the case of sandbox8, node1-2) the respective IP address in hex is 0x0A.12.01.12 and as such its symbolic links' filename will be 0A120112.
+
+/tftpboot/pxelinux.cfg/0A120112 --> orbit-2.0.0
+
+{{{
+DEFAULT boel
+
+LABEL boel
+KERNEL linux-orbit-pxe-2.6.20.4
+APPEND rw init=/sbin/init initrd=initramfs-orbit-pxe-2.0.0.gz console=tty0 console=ttyS0,9600
+DISPLAY message.txt
+PROMPT 1
+TIMEOUT 1
+}}}
+
+After the symbolic link request the nodehandler will the reboot the node and based on this example the node will then load linux-orbit-pxe-2.6.20.4 with initramfs-orbit-pxe-2.0.0.gz as its initramfs cpio archive. The kernel then boots and finally calls /etc/init.d/rcS:
+
+{{{
+#!/bin/sh
+NETDEV_0="eth0"
+NETDEV_DHCP="eth1"
+UDHCPC_SCRIPT="/etc/udhcp.script"
+UDHCPC="/sbin/udhcpc"
+IP_CONFIG="/bin/ip"
+
+mount -t proc proc /proc
+
+# Get network up
+$IP_CONFIG link set $NETDEV_0 up
+$IP_CONFIG link set $NETDEV_DHCP up
+$UDHCPC -i $NETDEV_DHCP -s $UDHCPC_SCRIPT
+
+cat /.orbit_image
+# Start nodeagent
+nodeagent&
+}}}
+
+After this nodeagent will just wait until nodehandler issues it further commands.