<div>
Much depends on what version of dhcp is being used on the system, but if it is either of the standard DHCPs then these commands should stop it, then remove it permanently. &nbsp;One of the remove commands should fail. &nbsp;If both fail, then some other version of DHCP is being used.<br />
<br />
<i>sudo /etc/init.d/dhcp stop<br />
sudo apt-get remove isc-dhcp-server<br />
sudo apt-get remove dhcp3-server</i><br />
<br />
Be <u>100% sure</u> that the system has been configured properly for static addressing before doing this. &nbsp;If there is any error, on the next reboot the system will only be accessible from the console - and if it doesn't have one, there will be considerable inconvenience getting it running again.
</div>


IT Support

Dwight Baer

<div>
Dr. Klahn,<br />
<br />
/etc/init.d/dhcp: &nbsp;No such file or &nbsp;directory.<br />
<br />
I have attached a pdf file containing the output of &quot;fine / -name &quot;*dhcp*&quot; - for both Ubuntu 14.04.6 and 18.04.4<br />
<br />
Thanks<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/04_w16/1450243/dhcp-related.pdf" target="_blank" class="file-inline" title="all dhcp-related files on my system (1.4 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>dhcp-related.pdf</a>
</div>


dhcp-related.pdf

<div>
Mazdajai: <br />
<br />
Your suggestion produced: &nbsp;&quot;status: &nbsp;Unknow job: &nbsp;isc-dhcp-server&quot;<br />
<br />
Attached please find everything on my system related to &quot;isc-dhcp-server&quot;<br />
<br />
Thanks<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/04_w16/1450244/isc-dhcp-server-related.pdf" target="_blank" class="file-inline" title="all files related to isc-dhcp-server (654 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>isc-dhcp-server-related.pdf</a>
</div>


isc-dhcp-server-related.pdf

<div>
(I apologize for my spelling typos on both my previous messages.)
</div>


<div>
What about if I just kill the dhcpd process? &nbsp;See attached<br />
<br />
Thanks<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/04_w16/1450248/suggestion-kill-dhcpd.pdf" target="_blank" class="file-inline" title="suggestion (524 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>suggestion-kill-dhcpd.pdf</a>
</div>


suggestion-kill-dhcpd.pdf

<div>
OK, then your system inits with systemd instead of SysV init and uses dhcp3. &nbsp;This should stop the service:<br />
<br />
service dhcp3-server stop<br />
<br />
and then remove it with the apt command line as previous above.
</div>


<div>
cat /run/dhcp-server/dhcpd.pid<wbr />:<br />
<br />
1358
</div>


<div>
&quot;service dhcp3-server stop&quot; produces:<br />
<br />
dhcp3-server: &nbsp;unrecognized service
</div>


<div>
Thanks Dr. Klahn and Mazdajai.<br />
<br />
I spoke to someone who was around when this was installed. &nbsp;I think the dhcpd daemon had something to do with ltsp.<br />
<br />
Anyway ... I'm going to give up on shutting it down properly. &nbsp;I learned a lot from this exercise. &nbsp;I'm just going to physically shut the machine down when I'm ready. &nbsp;Then it will be &quot;repurposed&quot;.
</div>


<div>
There's a very good likelihood some other process is handling DHCP address/lease management.<br />
<br />
Ubuntu Tahr (14.04) is so old + &nbsp;various hosting companies can setup DHCP in all manner of ways... I'd start here...<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-43067760-1"><span>ps auxww | grep dhcp</span>
</code></pre>
<br />
See what processes come up.<br />
<br />
You might find some combination of dhclient + dnsmasq are handling your DHCP.<br />
<br />
Then you'll interact with your hosting company or admin staff about how best to effect DHCP changes so machines survive.<br />
<br />
Note: If you're running any type of container system... let's see... with Trusty this will likely be LXC... nuking DHCP will likely also destroy all container communications, as DHCP wiring is used for LXC (and all other similar systems) for container communications. <br />
<br />
Careful: DHCP ca be intertwined with your entire network setup, so if you do successfully kill off all DHCP related processes, this will also likely kill off your entire machine connectivity... so be sure you cut + paste all steps you take into a text file, so if you have to reboot in single user mode to get your machine to work again, you know exactly what to do.<br />
<br />
Tip: Might be best to open a 2nd question describing the problem you're trying to solve, as... nuking DHCP might be near impossible... I say &quot;near&quot; because you can do anything you, given sufficient time + money + acceptable long down time...
</div>


Principal Software Engineer

Dr. Klahn

<div>
Thanks David! &nbsp;I appreciate your thoughtful suggestions.
</div>


<div>
<div class="content wysiwyg-content">
I'm a new Ubuntu administrator. &nbsp;I need to stop the DHCP server permanently, not just for this session. &nbsp;Ubuntu 14.04.6<br />
&nbsp;<br />
As a bonus ... if you could please help me with how to start the DHCP service in Ubuntu 18.04.4<br />
<br />
Thanks.
</div>
</div>


I'm a new Ubuntu administrator.  I need to stop the DHCP server permanently, not just for this session.  Ubuntu 14.04.6
 
As a bonus ... if you could please help me with how to start the DHCP service in Ubuntu 18.04.4

Thanks.

Ubuntu 14.04.6 - how to start and stop the DHCP server

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.

Ubuntu

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

Kernel programming for Linux operating systems can be done with many different languages; C, C++, Python, Perl and Java, which are some of the most common languages used.There are also many different varieties of Linux, such as Ubuntu, Fedora and OpenSUSE.