Any Recommendation on creating a custom iso from installed OS

[robinsmidsrod]

sanboot is for booting block storage, like an ISO file, or iSCSI/AoE block devices. In your case you have unpacked the ISO, so sanboot is no longer the tool you should use. Using kernel+initrd is the correct approach. You're a bit mistaken with the imgargs you supply. Specifying nfsroot with a string that starts with http:// isn't right. The parameter should look like this:

Code:

nfsroot=192.168.13.5:/nfsshare/

(and no quotes). The "set root-path" and "set nfs-server" commands are redundant and can be removed. Also be aware that iPXE now supports booting from NFS, so the kernel and initrd lines can use nfs://192.168.13.5/nfsshare/casper/ as the start instead of http://... Just remember you need to enable NFS support in iPXE first.