Diskless Boot - LinuxUserGroupUWSP/RackMesa GitHub Wiki

#Prerequisites

  1. PXE
  2. NFS or distributed filesystem

#Installation Use --installroot to install packages to the shared system.

yum groups -y install "Minimal Install" --releasever=7 --installroot=/var/lib/tftpboot/centos7/root/

Create a root password.

python -c 'import crypt,getpass;
print(crypt.crypt(getpass.getpass(),
crypt.mksalt(crypt.METHOD_SHA512)))'

vi /var/lib/tftpboot/centos7/root/etc/shadow
root:<password>

Create client fstab.

vi /var/lib/tftpboot/centos7/root/etc/fstab
none    /tmp        tmpfs   defaults   0 0
tmpfs   /dev/shm    tmpfs   defaults   0 0
sysfs   /sys        sysfs   defaults   0 0
proc    /proc       proc    defaults   0 0

Configure NFS to share system files.

vi /etc/exports
/var/lib/tftpboot/centos7/root 10.0.0.0/24(rw,no_root_squash)

Download the CentOS 7 kernel images.

wget -P /var/lib/tftpboot/centos7/ \
http://mirror.centos.org/centos/7/os/x86_64/images/pxeboot/vmlinuz \
http://mirror.centos.org/centos/7/os/x86_64/images/pxeboot/initrd.img


vi /var/lib/tftpboot/pxelinux.cfg/default

Add the CentOS 7 option to the menu.

default centos7

label centos7
    kernel centos7/vmlinuz
    append initrd=centos7/initrd.img root=nfs:<nfs-server>:/var/lib/tftpboot/centos7/root rw selinux=0

Allow NFS connections.

firewall-cmd --permanent --add-service=nfs
firewall-cmd --permanent --add-service=mountd
firewall-cmd --reload

Start the NFS server.

systemctl start rpcbind nfs-server
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