How to solve the problem of CentOS DHCP server startup failure

How to solve the problem of CentOS DHCP server startup failure?

First, let’s install the DHCP software package

1. Create a folder to mount the CD image

mkdir /mnt/cdrom

2. Mount the image

mount /dev/cdrom /mnt/cdrom

3. Modify the yum configuration file

  vim /etc/yum.repos.d/CentOS-Media.repo

Change the baseurl to the previous CD image mount point

 gpgcheck =0  关闭自检
 enable=1      启动

4. Rename CentOS-Base.repo to CentOS-Base.repo_back Invalidate network yum

mv CentOS-Base.repo CentOS-Base.repo_back

5. Modify the DHCP configuration file

 vim /etcdhcp/dhcpd.conf

Before, I had been referring to books and methods to modify the configuration file, but when I finally turned on the DHCP server, it failed.

After searching for various reasons on the Internet, I couldn't solve it. Finally, I saw the sentence see /user/share/doc/dhcp* in the DHCP configuration file. /dhcpd.comf.sample So I went in and checked it out

cat /user/share/doc/dhcp*/dhcpd.comf.sample

It was full of comments and stuff. But there is a similar content in the configuration file

There is no configuration of

ddns update-style interim;
igmore client-updates;

So I changed the # in the configuration file ##

ddns update-style interim;
igmore client-updates;  删除

Restart the DHCP service again

It can start normally

Because I am using the bridge mode on the virtual machine, and my LAN uses static IP address acquisition, so I tested it on my physical machine

and was able to obtain the IP address normally

##Related references:

centOS tutorial

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