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← Revision 16 as of 2021-12-31 03:56:28 ⇥
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| The DHCP server is a must in any network. We will use ISC's DHCP server, and configure two servers to make a redundant system. The two servers will be able to synchronized the dhcp leases between servers and update the DNS too. | The DHCP server is a central part of the network. We will use ISC's DHCP server, and configure two servers to make a redundant system. The two servers will be able to synchronize the dhcp leases between servers and update the DNS too. They will be running in an active/passive setup. |
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| In this setup we use the following IP-addresses for the master and slave: | In this setup we use the following IP-addresses for the primary and secondary: |
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| 192.168.1.36 master 192.168.1.37 slave |
* 192.168.1.38 primary * 192.168.1.39 secondary |
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| Configure the master, then the slave. | Configure the [[DHCP Primary|primary]], then the [[DHCP Secondary|secondary]]. |
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| == Software == | == Maintenance == |
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| {{{ apt-get install dhcp }}} |
Once the two servers are configured, you will notice that there is only a small difference between them. The difference is in `/etc/dhcp/dhcpd.conf`, which includes `/etc/dhcp/dhcpd.conf_primary` for the DHCP primary and `/etc/dhcp/dhcpd.conf_secondary` for the DHCP secondary. This is on purpose and will make configuration changes much easier. The config files on the two servers has to be identical. If they are not identical, the DHCP servers will most likely not start. Make a strategy where configuration changes are made on the primary and then copied to the secondary. Just avoid overwriting `/etc/dhcp/dhcpd.conf`. |
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| == Network == We will give the DNS master a static IP-address. Edit `/etc/networking/interfaces` and make the following changes. {{{ # The primary network interface #allow-hotplug eth0 #iface eth0 inet dhcp auto eth0 iface eth0 inet static address 192.168.1.36 network 192.168.1.0 netmask 255.255.255.0 broadcast 192.168.1.255 gateway 192.168.1.1 }}} |
The descriptions below apply to both the DHCP primary and the DHCP secondary, meaning that any configuration changes will have to be made on both DHCP servers in identical ways. |
DHCP
The DHCP server is a central part of the network. We will use ISC's DHCP server, and configure two servers to make a redundant system. The two servers will be able to synchronize the dhcp leases between servers and update the DNS too. They will be running in an active/passive setup.
In this setup we use the following IP-addresses for the primary and secondary:
- 192.168.1.38 primary
- 192.168.1.39 secondary
Configure the primary, then the secondary.
Maintenance
Once the two servers are configured, you will notice that there is only a small difference between them. The difference is in /etc/dhcp/dhcpd.conf, which includes /etc/dhcp/dhcpd.conf_primary for the DHCP primary and /etc/dhcp/dhcpd.conf_secondary for the DHCP secondary. This is on purpose and will make configuration changes much easier. The config files on the two servers has to be identical. If they are not identical, the DHCP servers will most likely not start. Make a strategy where configuration changes are made on the primary and then copied to the secondary. Just avoid overwriting /etc/dhcp/dhcpd.conf.
The descriptions below apply to both the DHCP primary and the DHCP secondary, meaning that any configuration changes will have to be made on both DHCP servers in identical ways.