搭建dhcp服务，实现ip地址申请分发

DHCP实现：

注意：

（1）实现DHCP服务前，先将网络已有DHCP服务，如：vmware中的DHCP关闭，防止冲突
（2）DHCP服务器本身采用静态IP
（3）必须配置和DHCP网卡的静态IP所在网段的subnet 段,否则DHCP服务无法启动

DHCP服务的实现软件：
dhcp（CentOS 7 之前版本）或 dhcp-server（CentOS 8 中的包名）

dhcp服务配置文件：/etc/dhcp/dhcpd.conf

dhcp服务配置范例文件：/usr/share/doc/dhcp*/dhcpd.conf.example

1、关闭vmware中的DHCP

2、安装dhcp

[root@centos7 ~]#yum install -y dhcp

3、复制并修改配置文件，给指定主机分配固定IP

[root@centos7 ~]#rpm -ql dhcp
/etc/NetworkManager
/etc/NetworkManager/dispatcher.d
/etc/NetworkManager/dispatcher.d/12-dhcpd
/etc/dhcp/dhcpd.conf
/etc/dhcp/dhcpd6.conf
/etc/dhcp/scripts
/etc/dhcp/scripts/README.scripts
/etc/openldap/schema/dhcp.schema
/etc/sysconfig/dhcpd
/usr/bin/omshell
/usr/lib/systemd/system/dhcpd.service
/usr/lib/systemd/system/dhcpd6.service
/usr/lib/systemd/system/dhcrelay.service
/usr/sbin/dhcpd
/usr/sbin/dhcrelay
/usr/share/doc/dhcp-4.2.5
/usr/share/doc/dhcp-4.2.5/dhcpd.conf.example
/usr/share/doc/dhcp-4.2.5/dhcpd6.conf.example
/usr/share/doc/dhcp-4.2.5/ldap
/usr/share/doc/dhcp-4.2.5/ldap/README.ldap
/usr/share/doc/dhcp-4.2.5/ldap/dhcp.schema
/usr/share/doc/dhcp-4.2.5/ldap/dhcpd-conf-to-ldap
/usr/share/man/man1/omshell.1.gz
/usr/share/man/man5/dhcpd.conf.5.gz
/usr/share/man/man5/dhcpd.leases.5.gz
/usr/share/man/man8/dhcpd.8.gz
/usr/share/man/man8/dhcrelay.8.gz
/usr/share/systemtap/tapset/dhcpd.stp
/var/lib/dhcpd
/var/lib/dhcpd/dhcpd.leases
/var/lib/dhcpd/dhcpd6.leases
[root@centos7 ~]#cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf
cp: overwrite ‘/etc/dhcp/dhcpd.conf’? y
[root@centos7 ~]#ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope hostvalid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:33:b7:af brd ff:ff:ff:ff:ff:ffinet 10.0.0.7/24 brd 10.0.0.255 scope global noprefixroute eth0valid_lft forever preferred_lft foreverinet6 fe80::31c3:e200:902b:ae0e/64 scope link noprefixroutevalid_lft forever preferred_lft forever
[root@centos7 ~]#vim /etc/dhcp/dhcpd.conf
[root@centos7 ~]#cat /etc/dhcp/dhcpd.conf
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
## option definitions common to all supported networks...
option domain-name "example.org";
option domain-name-servers 223.5.5.5, 180.76.76.76;default-lease-time 86400;
max-lease-time 106400;# Use this to enble / disable dynamic dns updates globally.
#ddns-update-style none;# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.subnet 10.0.0.0 netmask 255.255.255.0 {range 10.0.0.150 10.0.0.180;option routers 10.0.0.2;
}# This is a very basic subnet declaration.subnet 10.254.239.0 netmask 255.255.255.224 {range 10.254.239.10 10.254.239.20;option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
}# This declaration allows BOOTP clients to get dynamic addresses,
# which we don't really recommend.subnet 10.254.239.32 netmask 255.255.255.224 {range dynamic-bootp 10.254.239.40 10.254.239.60;option broadcast-address 10.254.239.31;option routers rtr-239-32-1.example.org;
}# A slightly different configuration for an internal subnet.
subnet 10.5.5.0 netmask 255.255.255.224 {range 10.5.5.26 10.5.5.30;option domain-name-servers ns1.internal.example.org;option domain-name "internal.example.org";option routers 10.5.5.1;option broadcast-address 10.5.5.31;default-lease-time 600;max-lease-time 7200;
}# Hosts which require special configuration options can be listed in
# host statements.   If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
host testhost {hardware ethernet 00:0c:29:33:b7:af;fixed-address 10.0.0.123;
}
host passacaglia {hardware ethernet 0:0:c0:5d:bd:95;filename "vmunix.passacaglia";server-name "toccata.fugue.com";
}# Fixed IP addresses can also be specified for hosts.   These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP.   Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
host fantasia {hardware ethernet 08:00:07:26:c0:a5;fixed-address fantasia.fugue.com;
}# You can declare a class of clients and then do address allocation
# based on that.   The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.class "foo" {match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
}shared-network 224-29 {subnet 10.17.224.0 netmask 255.255.255.0 {option routers rtr-224.example.org;}subnet 10.0.29.0 netmask 255.255.255.0 {option routers rtr-29.example.org;}pool {allow members of "foo";range 10.17.224.10 10.17.224.250;}pool {deny members of "foo";range 10.0.29.10 10.0.29.230;}
}

4、启动dhcp服务，查看dhcp客户端申请地址的过程

[root@centos7 ~]#systemctl start dhcpd
[root@centos7 ~]#dhclient -d
Internet Systems Consortium DHCP Client 4.2.5
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/Listening on LPF/eth0/00:0c:29:33:b7:af
Sending on   LPF/eth0/00:0c:29:33:b7:af
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4 (xid=0x508cbce0)
DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x508cbce0)
DHCPOFFER from 10.0.0.7
DHCPACK from 10.0.0.7 (xid=0x508cbce0)
bound to 10.0.0.123 -- renewal in 37907 seconds.
[root@centos7 ~]#ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope hostvalid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:33:b7:af brd ff:ff:ff:ff:ff:ffinet 10.0.0.7/24 brd 10.0.0.255 scope global noprefixroute eth0valid_lft forever preferred_lft foreverinet 10.0.0.123/24 brd 10.0.0.255 scope global secondary dynamic eth0valid_lft 86259sec preferred_lft 86259secinet6 fe80::31c3:e200:902b:ae0e/64 scope link noprefixroutevalid_lft forever preferred_lft forever

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