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--- linux_wiki:os_install_pxe_boot [2016/02/01 00:19]
billdozor [OS Install PXE Boot]
+++ linux_wiki:os_install_pxe_boot [2019/05/25 23:50] (current)
@@ Line 5: / Line 5: @@
 In order to install an OS via PXE boot, a TFTP and DHCP server are required.\\
 Using PXE allows for clients to begin a network installation without any net-install ISO.
+  * Reference Source: http://www.tecmint.com/install-pxe-network-boot-server-in-centos-7/
 **Checklist**
-  * Distro: Enterprise Linux 7
+  * Distro(s): Enterprise Linux 7
-  * Installation Server Created (NFS/HTTP/FTP) that is hosting the install DVD and kickstart file
+  * Other: Installation Server Created (NFS/HTTP/FTP) that is hosting the install DVD and kickstart file
+    * Example: Using [[linux_wiki:os_install_bare_metal#netinstall_iso_prep|NFS as an Installation Server]]
 ----
@@ Line 14: / Line 17: @@
 ====== TFTP Server ======
-  * Install the required package<code bash>yum install tftp-server</code>
+  * Install the required packages<code bash>yum install tftp-server xinetd</code>
-  *
+  * Allow TFTP access (set disable = no)<code bash>vim /etc/xinetd.d/tftp
+service tftp
+{
+  ....some other variables...
+  disable = no
+  ....some other variables...
+}</code>
+  * Start and Enable xinetd<code bash>systemctl start xinetd
+systemctl enable xinetd</code>
+  * Allow through firewall (if enabled)<code bash>firewall-cmd --permanent --add-service=tftp
+firewall-cmd --reload</code>
+----
+====== DHCP Server ======
+  * Install required package<code bash>yum install dhcp</code>
+  * Edit DHCP config and customize per your network<code bash>vim /etc/dhcp/dhcpd.conf
+subnet 192.168.1.0 netmask 255.255.255.0 {
+  option routers 192.168.1.254 ;
+  range 192.168.1.240 192.168.1.250 ;
+  next-server 192.168.1.150 ;
+  filename "pxelinux.0" ;
+}
+</code>
+    * subnet => specify the network
+    * netmask => mask for your network
+    * option routers => gateway for the network
+    * range => start and ending IP to hand out via DHCP
+    * next-server => IP of the TFTP server
+    * filename => file that should be offered to systems doing PXE boot (relative to the TFTP server's root)
+  * Start and enable DHCP<code bash>systemctl start dhcp
+systemctl enable dhcp</code>
+----
+====== Create PXE Content ======
+Now that both required services are setup, it is time to create the PXE boot content to be handed out over TFTP.
+  * Install a required package<code bash>yum install syslinux</code>
+  * Create the PXE Linux directory structure<code bash>mkdir -p /var/lib/tftpboot/pxelinux.cfg
+mkdir /var/lib/tftpboot/centos7/</code>
+  * Copy the pxelinux.0 data file<code bash>cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/</code>
+  * Create the PXE Linux default config file (replace '<nfs-ip>' with actual NFS server IP<code bash>vim /var/lib/tftpboot/pxelinux.cfg/default
+default menu.c32
+prompt 0
+timeout 600
+menu title ########## PXE Boot Menu ##########
+label 1
+  menu label ^1) Install CentOS 7.2 x86-64
+  kernel centos7/vmlinuz
+  append initrd=centos7/initrd.img method=nfs:<nfs-ip>:/iso/centos7.2-dvd/
+</code>
+    * PXE Boot Menu Reference Source: https://wiki.centos.org/HowTos/PXE/PXE_Setup/Menus
+  * To include a splash image when doing PXE, copy the image from the local system<code bash>cp /boot/grub/splash.xpm.gz /var/lib/tftpboot/</code>
+  * Copy the files (images/pxeboot/vmlinuz and initrd.img) from the install disk to /var/lib/tftpboot/centos7/<code bash>mount -t iso9660 -o loop CentOS-7-x86_64-DVD-1511.iso /mnt
+cp /mnt/images/pxeboot/vmlinuz /var/lib/tftpboot/centos7/
+cp /mnt/images/pxeboot/initrd.img /var/lib/tftpboot/centos7/</code>
+  * Restart dhcpd and xinetd<code bash>systemctl restart dhcpd
+systemctl restart xinetd</code>
+\\
+**The system is now ready to accept incoming PXE boot requests.**
+/var/lib/tftpboot/ contains:
+  * centos7 (directory)
+  * pxelinux.0 (data file)
+  * pxelinux.cfg (directory)
+  * splash.xpm.gz (splash image)
+/var/lib/tftpboot/centos7 contains:
+  * initrd.img (centos 7 initrd)
+  * vmlinuz (centos 7 boot kernel)
+/var/lib/tftpboot/pxelinux.cfg contains:
+  * default (config file)
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