Difference between pages "User:Drobbins/Resume" and "Hostname"

< User:Drobbins(Difference between pages)
 
 
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= Daniel Robbins =
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==Introduction==
__NOEDITSECTION__
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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.
__NOTOC__
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==Configuration==
__NOTITLE__
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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:
== Profile ==
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<console>
 +
localhost ~ # ##i## Hello :)
 +
</console>
 +
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.
 +
<console>
 +
localhost ~ # ##i## nano /etc/conf.d/hostname
 +
</console>
 +
Let's set it to hostname="oleg-stable.host.funtoo.org". Save the file and restart  a hostname service:
 +
<console>
 +
localhost ~ # ##i## service hostname restart
 +
</console>
 +
Now, let's examine our changes, after a restarting a hostname
 +
<console>
 +
oleg-stable ~ # ##i## Hello :)
 +
</console>
 +
== 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 <code>PS1</code> 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:
 +
<console>
 +
oleg-stable ~ # ##i## hostname
 +
oleg-stable.host.funtoo.org
 +
</console>
 +
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.
 +
<console>
 +
oleg-stable ~ # ##i## hostname -s
 +
oleg-stable
 +
</console>
 +
Good! Hostname offers more then just displaying a system host name but can also set one. Let's try:
 +
<console>
 +
oleg-stable ~ # ##i## hostname foo.bar.baz
 +
oleg-stable ~ # ##i## hostname
 +
foo.bar.baz
 +
</console>
 +
As you can see, we changed a hostname on-the-fly. This is not recommended way.
 +
{{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.}}
  
I am the creator of the Gentoo Linux operating system, an experienced architect of large-scale technology efforts, a strong Open Source project leader, a skilled software developer, and an accomplished technical writer.
+
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.
  
I have made significant contributions at a number of organizations, including E*TRADE Financial and Microsoft Corporation. I have written many popular articles for IBM developerWorks and Intel Developer Services, and my writing has also appeared in C/C++ Users Journal.
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==Hosts case==
 +
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
 +
{{file|name=/etc/hosts|body=
 +
# 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 <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.
  
== Experience ==
+
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:
 
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<console>
=== MediaWiki Consultant, WikiWorks; Jan 2014 - Present ===
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oleg-stable ~ # ##i## echo 'aliases="10.1.12 oleg.distant.home"' >> /etc/conf.d/hostname
 
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oleg-stable ~ # ##i## service hostname restart
Expertise in deploying, developing and maintaining MediaWiki and Semantic MediaWiki. LDAP/Active Directory integration, MediaWiki extension development, Wiki farm architecture.
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</console>
 
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Examine our changes:
===Open Source Strategy Lead, Zenoss, Inc.; Austin, TX - Dec 2011 - Jan 2014 ===
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<console>
 
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oleg-stable ~ # ##i## cat /etc/hosts
Led Open Source efforts, including Zenoss Core architecture, community management and Open Source
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</console>
release coordination. Architected new community infrastructure based on Semantic MediaWiki. Created
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{{file|name=/etc/hosts|body=
authoritative online catalog of all community ZenPacks. Created auto-build system for ZenPacks. Advised
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# Auto-generated hostname. Please do not remove this comment.
Zenoss on Open Source and licensing issues and advanced Open Source initiatives throughout the company
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10.1.1.2       oleg.distant.home
 
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127.0.0.1      oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
===Senior Network and Application Performance Engineer, OPNET; Albuquerque, NM - Aug 2009 - Dec 2011 ===
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::1            oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
Part of OPNET's Professional Services division. Sole developer and architect of an advanced, visual browser-based datacenter facilities and capacity management system for a large government agency with 1500+ servers and datacenters in multiple US locations. Integrated server utilization data from multiple sources. Delivered advanced reporting, planning and analysis capabilities to the organization.
+
}}
 
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===President, Funtoo Technologies; Albuquerque, NM - 2006 to Present===
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Open Source consulting. Created Funtoo Linux, an advanced Gentoo Linux variant. Serving as Project Lead and responsible for managing Core development team. Implemented all core Funtoo technologies including Metro automated build system, automated git-based merge process, boot-update unified boot loader management system, and others.
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===Senior Principal, E*TRADE Financial; Menlo Park, CA (remote) - Aug 2007 to June 2009===
+
Primary architect of E*TRADE’s virtualization strategy for development and production-focused workloads. Performed applied research and development related to virtual container build automation, high-performance virtualization and Open Source collaborative efforts. Participation in E*TRADE’s architectural review and standards development process.
+
 
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===Vice President, Engineering, FSMLabs, Inc.; Socorro, NM - 2006 - 2007===
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Architected the 5.0 release of FSMLabs RTLinuxPro hard real-time OS development kit with support for x86, x86-64, PowerPC, MIPS and ARM architectures. Designed a modern package management system for managing the FSMLabs user-space application stack, and updated cross-compiler tool chain. Created RTLinuxPro for Windows virtual machine runtime. Integrated open source RTSP/RTP streaming media (MPEG-2/4) stack into RTLinuxPro.
+
 
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===Chief Technology Officer, ABC Coding Solutions; Albuquerque, NM - Jan 2006 - July 2006===
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Architected, developed, and deployed a HIPAA-compliant Web-based medical billing application featuring support for CPT, HCPCS and the proposed ABC procedure code set. Performed extensive SQL Server 2000 to 2005 data migration work. Architected an encrypted XML-based data storage layer in C#/ASP.NET 2.0. Designed suite of ASP.NET 2.0 controls to utilize XML-based encrypted data storage layer. Integrated AJAX functionality into Web application and hardened application prior to deployment.
+
 
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===Program Manager, Microsoft Corporation; Redmond, WA - 2005 to 2006===
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Responsible for contributing to Microsoft’s Open Source/Shared Source strategy and overseeing the daily operations of Microsoft’s Linux lab. Technical responsibilities included overseeing competitive analysis and technical tear-downs, Linux/Windows interoperability testing, and intra-Microsoft educational efforts.
+
 
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Contributed to Microsoft’s Shared Source licensing strategy. Tracked emerging Open Source trends and projects. Gained wide exposure to Microsoft technologies including Microsoft .NET, Windows Vista and Windows Vista device driver development. Met one-on-one with various technical luminaries throughout the company.
+
 
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===Chief Architect, Gentoo Linux; Albuquerque, NM - 1999 to 2005===
+
Project Creator, Chief Architect and Project Lead of large, distributed international Gentoo development team. Architected all core Gentoo Linux technologies and tools including Portage, Gentoo’s dependency-based system initialization scripts, and catalyst, Gentoo's high-level automated release-building tool. Directed Gentoo Linux releases and all technology development. Authored all original Gentoo Linux documentation and designed XML/XSLT-based Web site. Designed all Gentoo artwork and logos. Established not-for-profit Gentoo Foundation, Inc. to serve as a container for all Gentoo Linux IP.
+
 
+
===Regular Columnist, IBM developerWorks, 2000 to 2003 ===
+
Author of critically acclaimed Linux and Unix-related technical articles geared towards developers and IT professionals.
+

Revision as of 16:06, February 24, 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="10.1.12 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