Set up PXE boot VM
From HallCWiki
Contents
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 x86_64 boot images from cdaqfs1 to /tftpboot/linux-diskless/:
scp -r root@cdaqfs1:/tftpboot/linux-diskless/boot .
- Copy armv7 boot images from cdaqfs1 to /tftpboot/linux-diskless/:
scp -r root@cdaqfs1:/tftpboot/linux-diskless/CentOS7-armv7-Diskless .
- 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
- Somehow, CODA running at coda@cdaql* is connecting to the ROCs using startROC.sh scripts under /home/coda/coda/coda_scripts/. So /home/coda/ needs to be mounted on the ROCs as well. Create a soft link
cdaqfs: ln -s /coda-home /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
armv7
- change the tftp server IP by interrupting the VTP boot process to get the 'Zynq" prompt. Then use "setenv" and "saveenv" to modify the tftp server ip
- The rest of the changes are similar to "x86_64" listed above