DHCP server: Difference between revisions

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jpeople, Administrators
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'''Setting DHCP server on clon10new (RHEL7)'''
'''Configure DHCP server on RHEL7'''


  yum install dhcp tftp tftp-server
  yum install dhcp
 
Bryan:
 
yum install nfs-utils tftp-server syslinux-tftpboot syslinux
 
yum install dnsmasq
 
mkdir /tftpboot
 
grub2-mknetdir --net-directory=/tftpboot/efi
 
 
Create file ''/etc/systemd/system/tftp.service'':
 
[Unit]
Description=Tftp Server
Requires=tftp.socket
Documentation=man:in.tftpd
 
[Service]
#ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot
ExecStart=/usr/sbin/in.tftpd -s /tftpboot
StandardInput=socket
 
[Install]
Also=tftp.socket
 
 
Start tftp:
 
systemctl start tftp
#systemctl start tftp.socket ??
 
Create file ''/tftpboot/efi/boot/grub2/grub.cfg'' with following contents:
 
 
function load_video {
insmod efi_gop
insmod efi_uga
insmod video_bochs
insmod video_cirrus
insmod all_video
}
 
load_video
set gfxpayload=keep
insmod gzio
set timeout=2
menuentry 'Diskless CentOS7 x86_64, any network device'  --class redhat --class gnu-linux --class gnu --class os {
linuxefi linux-install/CentOS7-x86_64-Diskless/vmlinuz-3.10.0-1062.9.1.el7.x86_64 zram=1 ip=::::::dhcp root=nfs:192.168.10.1:/diskless/CentOS7-devel/x86_64/root ro vga=0x305 module_blacklist=ipmi_si,ipmi_msghandler,ipmi_devintf,w83977f_wdt
initrdefi linux-install/CentOS7-x86_64-Diskless/initramfs-jvme-3.10.0-1062.9.1.el7.x86_64.img
}
 
Edit file ''/etc/dhcp/dhcpd.conf'':


Config file ''/etc/dhcp/dhcpd.conf'' should looks like this:
#
# DHCP Server Configuration file.
#  see /usr/share/doc/dhcp*/dhcpd.conf.example
#  see dhcpd.conf(5) man page
#
  subnet 192.168.10.0 netmask 255.255.255.0 {
  subnet 192.168.10.0 netmask 255.255.255.0 {
        option domain-name "jlab.org";
        option domain-name "clontest.com jlab.org";
        option domain-name-servers 129.57.32.100, 129.57.32.101;
        option domain-name-servers 192.168.10.1;
        option routers 192.168.10.1;
        option routers 192.168.10.1;
        use-host-decl-names true;
        use-host-decl-names true;
  pool {
  pool {
      range 192.168.10.2 192.168.10.20;
      range 192.168.10.2 192.168.10.20;
Line 68: Line 21:
      }
      }
  }
  }
 
  set vendorclass = option vendor-class-identifier;
  set vendorclass = option vendor-class-identifier;
  option pxe-system-type code 93 = unsigned integer 16;
  option pxe-system-type code 93 = unsigned integer 16;
  set pxetype = option pxe-system-type;
  set pxetype = option pxe-system-type;
 
  # DISKLESS Clients in here
  # DISKLESS Clients in here
  group
  group
Line 84: Line 37:
  }
  }
   next-server 192.168.10.1;
   next-server 192.168.10.1;
host test1 {
hardware ethernet 00:20:38:03:10:34;
  host test5 {
fixed-address 192.168.10.4;
}
  host test4 {
  hardware ethernet 00:20:38:10:14:f7;
  hardware ethernet 00:20:38:10:14:f7;
  fixed-address 192.168.10.5;
  fixed-address 192.168.10.5;
  }
  }
host test6 {
hardware ethernet 00:20:38:0A:07:D7;
fixed-address 192.168.10.6;
}
host test7 {
hardware ethernet 00:20:38:0F:2C:0D;
fixed-address 192.168.10.7;
}
  } # Diskless clients group
  } # Diskless clients group
Start dhcp:


Enable and start service:
systemctl enable dhcpd
  systemctl start dhcpd
  systemctl start dhcpd


 
Check service status, fix errors if any:
Install nfs:
  systemctl status dhcpd
 
yum install nfs-utils
 
Configure file ''/etc/exports'':
 
/diskless 192.168.10.0/24(rw,sync)
 
Start NFS server:
 
systemctl status nfs-server
 
Check that NFS is exporting. Command
 
showmount -e
 
have to show following:
 
Export list for clondaq15.jlab.org:
/diskless 192.168.10.0/24
 
 
To use local name server, install bind:
 
yum install bind
 
 
 
Login from console may not work because of file ''/etc/securetty'' permissions, it must be 644.
 
 
THere is a service PAM, it may prevent login from console if some required services did not start. To work around, comment out some lines in ''/etc/pam.d/system-auth-ac'' file:
 
  #%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
#auth        required      pam_env.so
auth        sufficient    pam_unix.so nullok try_first_pass
#auth        requisite    pam_succeed_if.so uid >= 1000 quiet_success
#auth        required      pam_deny.so
#account    required      pam_unix.so
account    sufficient    pam_localuser.so
account    sufficient    pam_succeed_if.so uid < 1000 quiet
#account    required      pam_permit.so
password    requisite    pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok
#password    required      pam_deny.so
session    optional      pam_keyinit.so revoke
#session    required      pam_limits.so
-session    optional      pam_systemd.so
session    [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
#session    required      pam_unix.so

Latest revision as of 15:23, 15 May 2025

Configure DHCP server on RHEL7 

yum install dhcp

Config file /etc/dhcp/dhcpd.conf should looks like this: 

#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.example
#   see dhcpd.conf(5) man page
#

subnet 192.168.10.0 netmask 255.255.255.0 {
        option domain-name "clontest.com jlab.org";
        option domain-name-servers 192.168.10.1;
        option routers 192.168.10.1;
        use-host-decl-names true;
	pool {
	     range 192.168.10.2 192.168.10.20;
	     deny dynamic bootp clients;
	     allow unknown clients;
	     }
}

set vendorclass = option vendor-class-identifier;
option pxe-system-type code 93 = unsigned integer 16;
set pxetype = option pxe-system-type;

# DISKLESS Clients in here
group
{
	if substring(vendorclass, 0, 9)="PXEClient" {
	   if pxetype=00:06 or pxetype=00:07 {
	      filename   "efi/boot/grub2/x86_64-efi/core.efi";
	   } else {
	      filename "linux-install/pxelinux.0";
	   }
	}
  	next-server 192.168.10.1;

	host test5 {
	 hardware ethernet 00:20:38:10:14:f7;
	 fixed-address 192.168.10.5;
	}

	host test6 {
	 hardware ethernet 00:20:38:0A:07:D7;
	 fixed-address 192.168.10.6;
	}

	host test7 {
	 hardware ethernet 00:20:38:0F:2C:0D;
	 fixed-address 192.168.10.7;
	}

} # Diskless clients group

Enable and start service: 

systemctl enable dhcpd
systemctl start dhcpd

Check service status, fix errors if any: 

systemctl status dhcpd
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