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--- linux_wiki:os_install_pxe_boot [2016/03/29 21:47]
billdozor [OS Install: PXE Boot]
+++ linux_wiki:os_install_pxe_boot [2019/05/25 23:50]
@@ Line 1: / Line 1: @@
-====== OS Install: PXE Boot ======
-**General Information**
-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(s): Enterprise Linux 7
-  * 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]]
-----
-====== TFTP Server ======
-  * 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/pxelinux/<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)
-----