实现DHCP服务和TFTP服务

DHCP：

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

[root@cent8_yzil ~]# yum install -y dhcp-server[root@cent8_yzil ~]# systemctl status dhcpd
● dhcpd.service - DHCPv4 Server DaemonLoaded: loaded (/usr/lib/systemd/system/dhcpd.service; disabled; vendor preset: disabled)Active: inactive (dead)Docs: man:dhcpd(8)man:dhcpd.conf(5)[root@cent8_yzil ~]# systemctl enable --now dhcpd
Created symlink /etc/systemd/system/multi-user.target.wants/dhcpd.service → /usr/lib/systemd/system/dhcpd.service.
Job for dhcpd.service failed because the control process exited with error code.
See "systemctl status dhcpd.service" and "journalctl -xe" for details.#服务起不来，查看一下配置文件
[root@cent8_yzil ~]# cat /etc/dhcp/dhcpd.conf
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp-server/dhcpd.conf.example    #dhcp服务配置范例文件
#   see dhcpd.conf(5) man page
#[root@cent8_yzil ~]# cp /usr/share/doc/dhcp-server/dhcpd.conf.example /etc/dhcp/dhcpd.conf
cp: overwrite '/etc/dhcp/dhcpd.conf'? yes
[root@cent8_yzil ~]#
#有了配置文件，服务还是起不来，说明配置还是不符合要求
[root@cent8_yzil ~]# systemctl enable --now dhcpd
Job for dhcpd.service failed because the control process exited with error code.
See "systemctl status dhcpd.service" and "journalctl -xe" for details.

#查看错误日志，没有对应的子网定义
[root@cent8_yzil ~]# cat /var/log/messages
Apr 28 22:05:17 cent8_yzil dhcpd[37755]: No subnet declaration for ens33 (10.0.0.133).[root@cent8_yzil ~]# vi /etc/dhcp/dhcpd.conf
subnet 10.0.0.0 netmask 255.255.255.0 {
}[root@cent8_yzil ~]# systemctl enable --now dhcpd
[root@cent8_yzil ~]# systemctl status dhcpd
● dhcpd.service - DHCPv4 Server DaemonLoaded: loaded (/usr/lib/systemd/system/dhcpd.service; enabled; vendor preset: disabled)Active: active (running) since Wed 2021-04-28 22:12:50 EDT; 40s agoDocs: man:dhcpd(8)man:dhcpd.conf(5)Main PID: 37947 (dhcpd)Status: "Dispatching packets..."Tasks: 1 (limit: 11251)Memory: 5.5MCGroup: /system.slice/dhcpd.service└─37947 /usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid
[root@cent8_yzil ~]# #监听端口udp67
[root@cent8_yzil ~]# ss -ntul
Netid        State         Recv-Q        Send-Q                Local Address:Port                Peer Address:Port
udp          UNCONN        0             0                     192.168.122.1:53                       0.0.0.0:*
udp          UNCONN        0             0                           0.0.0.0:67                       0.0.0.0:*
[root@cent8_yzil ~]#

#修改配置文件
[root@cent8_yzil ~]# vi /etc/dhcp/dhcpd.conf
option domain-name-servers 180.76.76.76, 223.5.5.5;   #DNSdefault-lease-time 86400;     #默认租期，修改为一天的时间，以秒为单位
max-lease-time 106400;        #最大周期
subnet 10.0.0.0 netmask 255.255.255.0 {range 10.0.0.150 10.0.0.160;    #分配的IP区间option routers 10.0.0.2;        #网关}[root@cent8_yzil ~]# systemctl restart dhcpd测试： forever 自动获取
[root@cent7_yzil ~]# systemctl restart network
[root@cent7_yzil ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1link/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 host valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:d3:72:51 brd ff:ff:ff:ff:ff:ffinet 10.0.0.150/24 brd 10.0.0.255 scope global dynamic ens33valid_lft 85893sec preferred_lft 85893secinet6 fe80::7e7e:c681:465:5aa6/64 scope link valid_lft forever preferred_lft forever
[root@cent7_yzil ~]# [root@y_zilong ~]# systemctl restart network
[root@y_zilong ~]# hostname  -I
10.0.0.151
[root@y_zilong ~]# #客户端打开udp68端口
[root@cent7_yzil ~]# ss -ntul
udp   UNCONN     0      0                              *:68                                         *:*
[root@cent7_yzil ~]#

#可以从dhcp服务器上看到分配出去的IP地址
[root@cent8_yzil ~]# cat /var/lib/dhcpd/dhcpd.leases
authoring-byte-order little-endian;lease 10.0.0.150 {starts 4 2021/04/29 02:31:21;ends 5 2021/04/30 02:31:21;tstp 5 2021/04/30 02:31:21;cltt 4 2021/04/29 02:31:21;binding state active;next binding state free;rewind binding state free;hardware ethernet 00:0c:29:d3:72:51;client-hostname "cent7_yzil";
}
lease 10.0.0.151 {starts 4 2021/04/29 02:32:00;ends 5 2021/04/30 02:32:00;tstp 5 2021/04/30 02:32:00;cltt 4 2021/04/29 02:32:00;binding state active;next binding state free;rewind binding state free;hardware ethernet 00:0c:29:74:76:e8;client-hostname "y_zilong";
}
server-duid "\000\001\000\001(\034\322\242\000\014)M\207\005";[root@cent8_yzil ~]# #查看客户端如何获取地址，通过广播自动获取
[root@cent7_yzil ~]# dhclient -d
DHCPDISCOVER on ens33 to 255.255.255.255 port 67 interval 8 (xid=0x7eed4116)
DHCPREQUEST on ens33 to 255.255.255.255 port 67 (xid=0x7eed4116)

[root@cent8_yzil ~]# vi /etc/dhcp/dhcpd.confoption domain-name-servers 180.76.76.76, 223.5.5.5;   #DNSdefault-lease-time 86400;     #默认租期，修改为一天的时间，以秒为单位
max-lease-time 106400;        #最大周期subnet 10.0.0.0 netmask 255.255.255.0 {range 10.0.0.150 10.0.0.160;    #分配的IP区间option routers 10.0.0.2;        #网关next-server 10.0.0.133;         #dhcp服务器的IP地址，下载服务器filename "pxelinux.0";          #grub文件
}指定固定IP地址，可以不在上面的分配IP区间之内，只要在10.0.0.0这个网段内的IP地址都可以
host testhost{hardware ethernet 00:0c:29:d3:72:51;fixed-address 10.0.0.123;
}[root@cent7_yzil ~]# dhclient -d
DHCPACK from 10.0.0.133 (xid=0x71c8e586)
bound to 10.0.0.123 -- renewal in 36677 seconds.[root@cent7_yzil ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:d3:72:51 brd ff:ff:ff:ff:ff:ffinet 10.0.0.123/24 brd 10.0.0.255 scope global dynamic ens33valid_lft 86202sec preferred_lft 86202secinet6 fe80::7e7e:c681:465:5aa6/64 scope link valid_lft forever preferred_lft forever
[root@cent7_yzil ~]#

TFTP：提供小文件的下载

[root@cent8_yzil ~]# yum -y install tftp-server[root@cent8_yzil ~]# systemctl enable --now tftp#监听69端口
[root@cent8_yzil ~]# ss -ntul
udp          UNCONN        0             0                                 *:69                             *:*
[root@cent8_yzil ~]##tftp共享目录：/var/lib/tftpboot/
[root@cent8_yzil ~]# ls /var/lib/tftpboot/
[root@cent8_yzil ~]# cp /etc/centos-release /var/lib/tftpboot/
[root@cent8_yzil ~]# ll /var/lib/tftpboot/
total 4
-rw-r--r--. 1 root root 30 Apr 28 23:19 centos-release
[root@cent8_yzil ~]# mv /var/lib/tftpboot/centos-release /var/lib/tftpboot/ver.txt
[root@cent8_yzil ~]# #下载tftp客户端：
[root@cent7_yzil ~]# yum install tftp[root@cent7_yzil ~]# tftp 10.0.0.133
tftp> get ver.txt[root@cent7_yzil ~]# ls
ver.txt
[root@cent7_yzil ~]# ll ver.txt
-rw-r--r--. 1 root root 0 Apr 28 20:22 ver.txt
[root@cent7_yzil ~]#

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