Detailed tutorial on how to automatically install CentOS7.6 using PXE

1. Demand

The base has 300 new servers, and needs to install the CentOS7.6 operating system by itself. Choose to use PXE for batch installation.

2. Preparation

Use a Layer 2 switch to connect servers that do not have an operating system installed to avoid affecting normal servers on the existing network.

Upload the operating system image to the server and install the necessary services for the PXE environment.

Mount the image file as a local software repository.

Environment Preparation

systemctl stop firewalld # Turn off the firewall setenforce 0 # Temporarily set SELINUX to loose mode sed -i '/^SELINUX=/s/.*/SELINUX=disabled/' /etc/selinux/config # Permanently disable SELINUX (requires reboot to take effect)
mkdir -p /var/www/html/CentOS1810/
mount /tmp/CentOS-7-x86_64-DVD-1810.iso /var/www/html/CentOS1810
mkdir /etc/yum.repos.d/backup 
mv /etc/yum.repos.d/{*,backup} # ignore the error message cat >/etc/yum.repos.d/local.repo<<EOF
[local_repo]
name=local_repo
baseurl=file:///var/www/html/CentOS1810
gpgcheck=0
EOF
yum clean all && yum makecache 
yum install httpd dhcp xinetd tftp-server syslinux -y

3. Service Configuration

Configure DHCP service

Modify the dhcp server configuration file

mv /etc/dhcp/dhcpd.conf{,.bak} # Back up the default configuration file cat>/etc/dhcp/dhcpd.conf<<EOF
subnet 10.0.0.0 netmask 255.255.255.0 { # Define the allocated network segment and mask range 10.0.0.1 10.0.0.252; # Define the allocated address range next-server 10.0.0.253; # Specify the server IP address of the boot file filename "pxelinux.0"; # Specify the boot file name}
EOF
systemctl start dhcp
systemctl enable dhcp
ss -nltup |grep :67

Configure tftp-server

Edit /etc/xinetd.d/tftp file

sed -i '/disable/s/yes/no/' /etc/xinetd.d/tftp
systemctl start xinetd
systemctl enable xinetd
ss -nltup |grep :69

Copy the relevant files to the default home directory of the tftp service

mkdir /var/lib/tftpboot/pxelinux.cfg 
cp -a {/var/www/html/CentOS1810/isolinux/*,/usr/share/syslinux/pxelinux.0} /var/lib/tftpboot/ # Copy the boot menu and boot loader cp -a /var/www/html/CentOS1810/isolinux/isolinux.cfg /var/lib/tftpboot/pxelinux.cfg/default

Summarize

The above is a detailed tutorial on how to automatically install CentOS7.6 using PXE. I hope it will be helpful to you. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!
If you find this article helpful, please feel free to reprint it and please indicate the source. Thank you!

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