Revision as of 14:25, 22 July 2024

PXE boot VM

• The ROCs and VTPs are booted using PXEboot. The PXEboot is hosted in a virtual machine located at the Hall ESX clusters. The VM name is "cdaqpxe.jlab.org"

Set up the PXE boot

• Install required packages: yum install nfs-utils tftp-server syslinux-tftpboot syslinux
• Enable tftp as root: (an explanation about tftp.service and tftp.socket: [1])

systemctl enable tftp.socket
systemctl start tftp.socket

• Create PXE boot directory:

cd /tftpboot
mkdir linux-diskless

• Set up PXE boot configurations

cd /tftpboot/linux-diskless
cp /usr/share/syslinux/pxelinux.0 . (This turns out not working. Instead, do: scp root@cdaqfs1:/tftpboot/linux-diskless/pxelinux.0 )
scp -r root@cdaqfs1:/tftpboot/linux-diskless/pxelinux.cfg .

• Copy boot images from cdaqfs1 to /tftpboot/linux-diskless/:

scp -r root@cdaqfs1:/tftpboot/linux-diskless/boot .

• Edit tftp systemd configuration file to let the tftp directory point to the /tftpboot:

vi /usr/lib/systemd/system/tftp.service

and change:

ExecStart=/usr/sbin/in.tftpd -s /tftpboot

Set up the filesystem and NFS export

x86_64

• The root/ NFS mount is defined in /tftpboot/linux-diskless/pxelinux.cfg/default
• Copy the file system over from cdaqfs1 to cdaqpxe:

cdaqfs1: /diskless/CentOS7/x86_64

• Change the root mount NFS server IP to cdaqpxe in /tftpboot/linux-diskless/pxelinux.cfg/default
• Change the snapshot mount NFS server at /diskless/CentOS7/x86_64/root/etc/sysconfig/readonly-root
• Copy the home mount directory over from cdaqfs1 to cdaqpxe:

cdaqfs1: /home/diskless/hccoda

cdaqfs1: /home/diskless/coda

• Change the home mount NFS server at /diskless/CentOS7/x86_64/root/etc/auto.master.d/auto.home
• Set up the NFS exports at cdaqpxe: /etc/exports