Difference between pages "Welcome" and "Hostname"

(Difference between pages)
 
(Hosts case)
 
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==Introduction==
{{#widget:YouTube16x9|playlist=PL2YVrx9jFJOewYI7f15FahwLOZlFCRqjZ}}
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A hostname is a unique name created to identify a machine on a network. In computer networking, a hostname  is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication such as the World Wide Web, e-mail or Usenet. Hostnames may be simple names consisting of a single word or phrase, or they may be structured.
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==Configuration==
[http://distrowatch.com/table.php?distribution=funtoo '''Funtoo Linux'''] is a Linux-based operating system that is a variant of [http://en.wikipedia.org/wiki/Gentoo_Linux Gentoo Linux], led by [[User:Drobbins|Daniel Robbins]] (the creator and former Chief Architect of Gentoo) who serves as benevolent dictator for life (BDFL) of the project. ''Funtoo Linux is optimized for the best possible performance, supporting Intel Core i7, AMD FX Processors, and others.''  [[Subarches|See what we support.]] See [[#Distinctives|Distinctives]], below, for more information about what makes us special.  
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In Funtoo Linux <code>/etc/conf.d/hostname</code> is the only configuration file for setting a hostname. In OpenRC framework <code>/etc/conf.d/foo</code> is the configuration file for a corresponding Init script <code>/etc/init.d/foo</code>.  With the case of hostname, default value in <code>/etc/conf.d/hostname</code> is set to ''localhost'', means when system boots and OpenRC's <code>/etc/init.d/hostname</code> script started a hostname getting only ''localhost'' name.  How it looks?  In your shell promt this will look in following way, an example for root:
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<console>
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localhost ~ # ##i## Hello :)
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</console>
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Let's play a bit with a configuration. Open <code>/etc/conf.d/hostname</code> with your favorite editor and set a hostname of your choice.  Below, I will use a real examples  from one of my working test boxes.
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<console>
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localhost ~ # ##i## nano /etc/conf.d/hostname
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</console>
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Let's set it to hostname="oleg-stable.host.funtoo.org". Save the file and restart  a hostname service:
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<console>
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localhost ~ # ##i## service hostname restart
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</console>
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Now, let's examine our changes, after a restarting a hostname
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<console>
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oleg-stable ~ # ##i## Hello :)
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</console>
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== Diving deeper==
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Notice, that in above output we seeing a shortened hostname and not a FQDN (Fully Qualified Domain Name). Don't be frustrated. This is how  default bash promt <code>PS1</code> set. To get nice promts, please, follow http://www.funtoo.org/Prompt_Magic
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Another way to test our settings is using a '''hostname''' command. Here we will show only some of it's features. Let's try to execute '''hostname''' command:
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<console>
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oleg-stable ~ # ##i## hostname
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oleg-stable.host.funtoo.org
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</console>
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Now we see our fully qualified domain name hostname just how we configured it in <code>/etc/conf.d/hostname</code> in above paragraph. To get a short hostname we need to set '''-s ''' (short) argument to hostname command.
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<console>
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oleg-stable ~ # ##i## hostname -s
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oleg-stable
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</console>
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Good! Hostname offers more then just displaying a system host name but can also set one. Let's try:
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<console>
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oleg-stable ~ # ##i## hostname foo.bar.baz
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oleg-stable ~ # ##i## hostname
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foo.bar.baz
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</console>
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As you can see, we changed a hostname on-the-fly. This is not recommended way.
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{{fancywarning|Please, notice that using '''hostname''' command to configure will work temporary for a current session and will be reverted back to a value set in <code>/etc/conf.d/hostname</code> file with next system restart.}}
  
'''Other Funtoo Projects include''':
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Now that we got a brief description of a hostname and basic configuration steps, its time to reflect another important case which is directly related to a Funtoo Linux hostname generation, a hosts.
*  '''[[Keychain]]''', an SSH/GPG agent front-end.
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* '''[[Metro]]''', automated Funtoo build engine.
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* '''[[Linux_Fundamentals,_Part_1|Learn Linux]]'''! [[Awk_by_Example,_Part_1|Awk]], [[Bash_by_Example,_Part_1|Bash]], [[Sed_by_Example,_Part_1|Sed]]  and more.
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==Hosts case==
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As per man page <code>hosts</code> stands for static table lookup for hostnames and it's configuration file is <code>/etc/hosts</code>. Here is how it looks
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{{file|name=/etc/hosts|body=
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# Auto-generated hostname. Please do not remove this comment.
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127.0.0.1      oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
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::1            oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
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}}
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As you can see it has entries from our <code>/etc/conf.d/hostname</code>. As you may have guessed, in Funtoo Linux <code>/etc/hosts</code> file entries are auto-generated, when OpenRC hostname service starts. Previously, it is used to edit <code>/etc/hosts</code> manually. In Funtoo Linux there is no such need.
  
'''Ebuild pages recently updated:''' {{#ask: [[Category:Ebuilds]]
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What about custom hosts entries? This can be easily configured with '''aliases'''. For example you want to have a hosts for your remote router or a computer in home LAN. Let's try to modify <code>/etc/conf.d/hostname</code> with adding following - my remote computer oleg.distant.home has an IP 10.1.1.2:
| order=descending
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<console>
| sort=Modification date
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oleg-stable ~ # ##i## echo 'aliases="10.1.1.2 oleg.distant.home"' >> /etc/conf.d/hostname
| format=list
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oleg-stable ~ # ##i## service hostname restart
| limit=10
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</console>
| searchlabel=
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Examine our changes:
}} [[Ebuilds|more...]]
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<console>
 
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oleg-stable ~ # ##i## cat /etc/hosts
'''Want to submit a screenshot or video? [http://forums.funtoo.org/index.php?/topic/180-screenshots/ See here.]'''
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</console>
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{{file|name=/etc/hosts|body=
{{Announce|{{SupportBlurb}}}}
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# Auto-generated hostname. Please do not remove this comment.
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10.1.1.2        oleg.distant.home
=== News ===
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127.0.0.1      oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
{{NewsList|3}}
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::1             oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
[[News|View More News...]]
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=== Expand the wiki! ===
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The [[:Help:Funtoo_Editing_Guidelines | How to 'wiki']] will help get you started on wiki editing. Have a look at [[Requested-Documents]] and [[:Category:Needs_Updates | pages that need to be updated.]]
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See [[:Category:Ebuilds|Ebuilds]] for a list of all ebuild pages, and [[Adding an Ebuild to the Wiki]] for information on how to add one.
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=== Distinctives ===
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Funtoo Linux is a meta-distribution, which means it is built (fully automatically) with the functionality and optimizations that ''you'' want, not what some distro maintainer thought was best for you. Packages are installed directly from source code, thanks to the [http://en.wikipedia.org/wiki/Portage_(software) Portage ports system], inspired by the FreeBSD ports system, written in Python and with full advanced package management functionality.  
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''Benefits for desktops'': leaner, optimized, faster system. ''Additional benefits for servers'': enable only what you actually need to reduce attack surface, thus improving security.
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We use [http://en.wikipedia.org/wiki/Git_(software) Git] for all our development, and we also use Git to deliver our ports tree to you.
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In contrast to Gentoo Linux, we offer a number of innovations, including our extensive use of git, [[Funtoo 1.0 Profile|our profile system]], [[Package:Boot-Update|boot-update]] boot management tool, our incredibly flexible [[Funtoo Linux Networking|template-based networking scripts]], [[Metro Quick Start Tutorial|Metro]] distribution build system, support of Debian, RHEL and other kernels, [[Creating_Python-related_Ebuilds|enhanced Python support]], Portage mini-manifests, user-centric distribution model, and a large number of community infrastructure improvements.
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=== Getting Started ===
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'''[[Funtoo Linux Installation|Install Funtoo Linux]]''' and get involved in our user community. Get to know fellow users on our '''[http://forums.funtoo.org forums]'''. Funtoo Linux has a very active [http://en.wikipedia.org/wiki/IRC IRC] community on [http://freenode.net Freenode] (in the <code>#funtoo</code> channel) and you are encouraged to hang out with us.
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'''[[Reporting Bugs|We welcome bug reports and suggestions]]'''.  Please report bugs to our '''[http://bugs.funtoo.org bug tracker]'''. We take all bugs seriously, and all work performed is tracked on our bug tracker, for purposes of transparency.
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'''{{CreateAccount}}''', which allows you to log in to the wiki, [http://forums.funtoo.org forums] and [https://bugs.funtoo.org bug tracker]. See the [[Funtoo Authentication FAQ|Auth FAQ]] for more info about account creation.
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'''See our [[Funtoo Linux FAQ|FAQ]] for answers to common questions.'''
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Other resources include [http://larrythecow.org larrythecow.org], the Gentoo blog aggregator, [http://kernel-seeds.org kernel-seeds.org], and [http://git.funtoo.org git.funtoo.org], our cgit repository browser.
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{{FuntooFriendly|Brownrice Internet}}
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</div></div></div>
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__NOTITLE__
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__NOEDITSECTION__
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{{#subobject:|slideIndex=0|slideCaption=
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<h4>h3nnn4n</h4>
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Awesome WM / Conky / screenfetch
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|slideImage=File:H3nnn4n.jpg}}
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{{#subobject:|slideIndex=1|slideCaption=
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<h4>Help us document the Gentoo Ecosystem!</h4>
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From Enoch to Gentoo to Funtoo to ChromeOS, and beyond...
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|slideImage=File:Ecosystem-snapshot.jpg|slideLink=Gentoo Ecosystem}}
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{{#subobject:|slideIndex=2|slideCaption=
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<h4>brushdemon</h4>
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OpenBox / screenfetch
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|slideImage=File:brushdemon.jpg}}
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{{#subobject:|slideIndex=3|slideCaption=
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<h4>drobbins</h4>
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[[GNOME First Steps|GNOME 3.14]]  / [[Funtoo_Linux_FAQ#Do_you_support_systemd.3F|without systemd]] / Badgers optional
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|slideImage=File:gnome3122.jpg|slideLink=GNOME First Steps}}
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{{#subobject:|slideIndex=4|slideCaption=
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<h4>spectromas</h4>
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[[Package:Awesome_(Window_Manager)|Awesome WM]]
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|slideImage=File:awesome.jpg|slideLink=Package:Awesome (Window Manager)}}
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{{#seo:
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|title=Funtoo Linux
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|keywords=funtoo,linux,gentoo,Daniel Robbins
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|description=Funtoo Linux is a Gentoo-based OS that uses a git-based Portage tree. Run by Daniel Robbins, creator of Gentoo.
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}}
 
}}
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Please use the funtoo-dev mailing list and #funtoo irc channel  for hostname and OpenRC support, questions as well as bug reports on bugs.funtoo.org.

Latest revision as of 12:12, February 26, 2015

Introduction

A hostname is a unique name created to identify a machine on a network. In computer networking, a hostname is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication such as the World Wide Web, e-mail or Usenet. Hostnames may be simple names consisting of a single word or phrase, or they may be structured.

Configuration

In Funtoo Linux /etc/conf.d/hostname is the only configuration file for setting a hostname. In OpenRC framework /etc/conf.d/foo is the configuration file for a corresponding Init script /etc/init.d/foo. With the case of hostname, default value in /etc/conf.d/hostname is set to localhost, means when system boots and OpenRC's /etc/init.d/hostname script started a hostname getting only localhost name. How it looks? In your shell promt this will look in following way, an example for root:

localhost ~ #  Hello :)

Let's play a bit with a configuration. Open /etc/conf.d/hostname with your favorite editor and set a hostname of your choice. Below, I will use a real examples from one of my working test boxes.

localhost ~ #  nano /etc/conf.d/hostname

Let's set it to hostname="oleg-stable.host.funtoo.org". Save the file and restart a hostname service:

localhost ~ #  service hostname restart

Now, let's examine our changes, after a restarting a hostname

oleg-stable ~ #  Hello :)

Diving deeper

Notice, that in above output we seeing a shortened hostname and not a FQDN (Fully Qualified Domain Name). Don't be frustrated. This is how default bash promt PS1 set. To get nice promts, please, follow http://www.funtoo.org/Prompt_Magic Another way to test our settings is using a hostname command. Here we will show only some of it's features. Let's try to execute hostname command:

oleg-stable ~ #  hostname
oleg-stable.host.funtoo.org

Now we see our fully qualified domain name hostname just how we configured it in /etc/conf.d/hostname in above paragraph. To get a short hostname we need to set -s (short) argument to hostname command.

oleg-stable ~ #  hostname -s
oleg-stable

Good! Hostname offers more then just displaying a system host name but can also set one. Let's try:

oleg-stable ~ #  hostname foo.bar.baz
oleg-stable ~ #  hostname 
foo.bar.baz

As you can see, we changed a hostname on-the-fly. This is not recommended way.

Warning

Please, notice that using hostname command to configure will work temporary for a current session and will be reverted back to a value set in /etc/conf.d/hostname file with next system restart.

Now that we got a brief description of a hostname and basic configuration steps, its time to reflect another important case which is directly related to a Funtoo Linux hostname generation, a hosts.

Hosts case

As per man page hosts stands for static table lookup for hostnames and it's configuration file is /etc/hosts. Here is how it looks

/etc/hosts
# Auto-generated hostname. Please do not remove this comment.
127.0.0.1       oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
::1             oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain

As you can see it has entries from our /etc/conf.d/hostname. As you may have guessed, in Funtoo Linux /etc/hosts file entries are auto-generated, when OpenRC hostname service starts. Previously, it is used to edit /etc/hosts manually. In Funtoo Linux there is no such need.

What about custom hosts entries? This can be easily configured with aliases. For example you want to have a hosts for your remote router or a computer in home LAN. Let's try to modify /etc/conf.d/hostname with adding following - my remote computer oleg.distant.home has an IP 10.1.1.2:

oleg-stable ~ #  echo 'aliases="10.1.1.2 oleg.distant.home"' >> /etc/conf.d/hostname
oleg-stable ~ #  service hostname restart
Examine our changes:
oleg-stable ~ #  cat /etc/hosts
/etc/hosts
# Auto-generated hostname. Please do not remove this comment.
10.1.1.2        oleg.distant.home
127.0.0.1       oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
::1             oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain

Please use the funtoo-dev mailing list and #funtoo irc channel for hostname and OpenRC support, questions as well as bug reports on bugs.funtoo.org.