6. Copy CentOS Distribution Data

1. Download ISO

   The CentOS ISO image can be downloaded from one of many mirrors listed on centos.org. Download with wget to the master node.

   [root@master ~]# yum install wget
   [root@master ~]# wget http://mirror.math.princeton.edu/pub/centos/7.9.2009/isos/x86_64/CentOS-7-x86_64-Everything-2207-02.iso
   

   Warning

   In MHPC Hardware please use http://172.16.0.1/repo/iso/CentOS-7.9-x86_64-Everything-2207-02.iso to download the iso image into the scratch folder.

   [root@master ~]# yum install wget
   [root@master ~]# cd /scratch
   [root@master scratch]# wget http://172.16.0.1/repo/iso/CentOS-7.9-x86_64-Everything-2207-02.iso
   

2. Mount ISO

   We need to extract the contents of that ISO image to a folder. Mount the ISO as loopback device into a folder, e.g. /mnt/iso.

   # mount ISO image
   [root@master ~]# mkdir -p /mnt/iso
   [root@master ~]# mount CentOS-7-x86_64-Everything-2207-02.iso /mnt/iso
   

3. Copy contents to folder

   Copy the contents of your mounted directory to a folder hosted by HTTP server, such as /var/www/html/CentOS-7-2207-02-x86_64.

   [root@master ~]# cp -r /mnt/iso /var/www/html/CentOS-7-2207-02-x86_64
   

4. Copy CentOS installer kernel and initrd file for PXE boot

   The ISO includes a kernel and initrd file which can be used for PXE booting via network. Copy these files into a centos7 folder in the TFTP root directory /var/lib/tftpboot/.

   [root@master ~]# mkdir -p /var/lib/tftpboot/centos7/
   [root@master ~]# cp /mnt/iso/images/pxeboot/vmlinuz /var/lib/tftpboot/centos7/
   [root@master ~]# cp /mnt/iso/images/pxeboot/initrd.img /var/lib/tftpboot/centos7/
   

5. Unmount ISO

   Finally unmount the ISO image.

   [root@master ~]# umount /mnt/iso