A hostname is the label given to a device connected to a computer network.

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33
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2answers
2k views

How is it that missing 0s are automatically added in IP addresses? (`ping 10.5` equivalent to `ping 10.0.0.5`)

I accidentally typed ssh 10.0.05 instead of ssh 10.0.0.5 and was very surprised that it worked. I also tried 10.005 and 10.5 and those also expanded automatically to 10.0.0.5. I also tried ...
13
votes
5answers
76k views

How to change hostname on centos 6.5?

Hi can't seem to change the hostname on my centos 6.5 host. I am following the instructions I found here: http://www.rackspace.com/knowledge_center/article/centos-hostname-change I set my /etc/hosts ...
13
votes
2answers
34k views

How to change the hostname of a linux machine using terminal?

I logged in for the first time, opened terminal, and typed in ‘hostname’. It returned ‘localhost.localdomain.com’. Then I logged as the root user in terminal using the command, ‘su –‘, provided the ...
10
votes
2answers
10k views

How to permanantly change hostname in Fedora 21

I've heard that changing the hostname in new versions of fedora is done with the hostnamectl command. In addition, I recently (and successfully) changed my hostname on Arch Linux with this method. ...
9
votes
3answers
917 views

How to change a hostname

During Debian installation, I set my hostname to the wrong value, and now I would like to correct that.
8
votes
3answers
4k views

How do I get to use .local hostnames with Arch Linux?

If I'm using Ubuntu or Linux Mint (the only two flavours I've tried and know work for sure), I can run something like this: wayne@myhost$ ssh wayne@otherhost.local And the name is automagically ...
8
votes
4answers
9k views

I changed my hostname, why is my bash PS1 prompt unchanged

I changed my hostname by editing /etc/hostname and can see the new hostname using the hostname and hostname -F commands. But the shell prompt is still showing the old hostname. This is Ubuntu 11.0.4 ...
8
votes
1answer
5k views

Wildcard in /etc/hosts file

It seems that wildcards are not supported in the /etc/hosts file. What is the best solution for me to resolve all *.local domains to localhost?
7
votes
4answers
429 views

Where does `hostname` store the hostname that I've set?

This is quite puzzling. Does anyone know where the hostname command stores and reads hostname from? I thought it was /etc/hostname but there is no such file on this Linux system that I'm using. I ...
7
votes
2answers
1k views

What are the ramifications of setting the hostname?

I have several Amazon EC2 servers and I'm using Chef to manage the configuration. I'd like to set the hostname so that the default bash prompt is more helpful. Right now after launching a new server ...
7
votes
7answers
35k views

How to get the hostname along with the domain name?

In unix (Solaris) is there any command that returns the hostname and domain name together? For instance: hostname -> servername domainname -> us.xyz.com I need : servername.us.xyz.com
7
votes
3answers
4k views

“Unable to resolve hostname” - how to cleanly change hostname without rebooting

At work, I work on a small website using Ubuntu servers hosted on Amazon EC2 instances. We have two webservers, and at any given time one of them is 'live' and one is 'testing', but when we've got our ...
6
votes
5answers
1k views

resolve all ip addresses in command output using standard command line tools

I have several log files that contain a bunch of ip addresses. I would love to be able to pipe the data through a program that would match and resolve ip addresses. I.E. cat /var/log/somelogfile | ...
6
votes
1answer
388 views

Why the difference between network addresses reported by hostname and ping?

I have tried hostname and ping in a cluster machine, with different outputs. I am wondering what is the difference between the two? For example, on the same machine, hostname outputs node4.XXX and ...
6
votes
2answers
9k views

Creating alias to domain name with /etc/hosts

I have a domain setup to point to my LAN's external IP using dynamic DNS, because my external IP address changes frequently. However, I want to create an alias to this host, so I can access it with ...
6
votes
1answer
306 views

`hostname` - host name or FQDN?

What is the right thing to set a computer's hostname to? (/bin/hostname, /etc/hostname, sethostname(2), etc.) I usually just use the "name" part, and it works perfectly (for me at least), but I've ...
5
votes
3answers
1k views

Preseed.cfg ignoring host setting

I am installing Debian Wheezy (netinstall) in VirtualBox using preseed.cfg. I tried both d-i netcfg/get_hostname string somehost and d-i netcfg/get_hostname string somehost, but in both cases the ...
5
votes
2answers
20k views

Unable to resolve hostname

So I try to do: ssh $(hostname) and it tells me: ssh: Could not resolve hostname woofy: Name or service not known It knows that its own hostname is "woofy"; why can't it connect to itself?
5
votes
3answers
10k views

How does traceroute resolve names?

While writing a script, I wanted to reference a machine by the computer name that I gave it (e.g. "selenium-rc"). I could not ping it using "selenium-rc", so I tried the following commands to see if ...
5
votes
1answer
256 views

Shell command/script to see if a host is alive?

I'm trying to figure out more ways to see if a given host is up, solely using shell commands (primarily bash). Ideally, it would be able to work with both hostnames and IP addresses. Right now the ...
5
votes
1answer
2k views

linux hostname -f command is not working on RHEL

I am running a RHEL 5.7 and the hostname command gives me the correct hostname. But hostname -s and hostname -f return: Unknown host. Why?
5
votes
1answer
557 views

Is there any way to access a hostname containing an underscore?

I have this weird problem. I need to access a website that contains an underscore from Linux. The hostname is invalid and Linux does treat it as such. The problem is that access from Windows seems to ...
5
votes
2answers
1k views

Determine FQDN when hostname doesn't give it?

In another question, I found that Puppet was generating certificates for my machine's FQDN but not the simple host name. In that example, kungfumaster was the hostname and was the value retrieved by ...
5
votes
2answers
6k views

What is sendmail referring to here?

When I install sendmail from the debian repos, I get the following output: Disabling HOST statistics file(/var/lib/sendmail/host_status). Creating /etc/mail/sendmail.cf... Creating ...
5
votes
1answer
6k views

Using DNSMasq for Local Hostname Resolution

I'm working on setting up a home intranet for me and my roommates. My idea is that we'll be able to store things like past utility bills in a place that's more accessible than a drawer in the kitchen ...
4
votes
2answers
392 views

How to decrypt hostnames of a crypted .ssh/known_hosts with a list of the hostnames?

I try to find a script to decrypt (unhash) the ssh hostnames in the known_hosts file by passing a list of the hostnamses. So, to do exactly the reverse of: ssh-keygen -H -f known_hosts Or also, to ...
4
votes
2answers
17k views

Hostname and IP address mapping in /etc/hosts

In my linux machine, when I run hostname, it shows mongodb, but when I run host mongodb, it shows: mongodb@mongodb:/var/hadoop/hadoop-1.2.1/bin$ host mongodb Host mongodb not found: 2(SERVFAIL) My ...
4
votes
2answers
853 views

Why is my hostname different in Emacs?

So I changed the name of my computer recently, by editing /etc/hostname. The bash prompt is user@name, so I know it has worked. But in emacs, in the window bar it says emacs@name.tiscali.co.uk. ...
4
votes
1answer
114 views

Getting a website's ip with 'host'?

Why is it that when I run the command host examplewebsite.com it gives me website's ip, but for some websites, when I type that IP address into the address bar and hit enter, it shows me a 404 page? ...
4
votes
2answers
34 views

Persistent Bash Prompt Prefix Linux

I want to have the FQDN as bash prefix instead of just using the hostname. So I can change root@web: ~$ to root@web.domain.tld: ~$ I already know that that is possible by using: ...
4
votes
2answers
959 views

Obtaining remote host name in bash script

Sorry my knowledge of Linux bash commands is pretty basic, I've been searching for a while but I'm not 100% sure what I need to search for. I was wondering if there's a way to grab the current logged ...
4
votes
2answers
4k views

in which file is hostname alias persistent, if not /etc/hosts?

In order to have an alias for my server, which can be seen in a "hostname -a" command, I edited the /etc/hosts file to add the alias at the end of the entry containing the hostname. For example, my ...
4
votes
1answer
201 views

show hostname in top

I'm using top with tmux to monitor the most-CPU-consuming processes on different computers. How can I get the hostname to be displayed in each pane? Can I tell top to display the hostname somehow?
4
votes
1answer
585 views

Display hostname in GDM3 on Fedora 19 at login screen

I'm managing almost 100 lab PC's running Fedora 19. It's difficult to manage because it seems like no where that I can display the hostname at the login screen. GDM version: gdm-3.8-3.2
3
votes
2answers
5k views

Get client hostnames from DHCP

I have a voyage 2.6.38 machine running DNSMASQ for a DHCP server and I would like to get the hostnames of the clients that acquire DHCP leases. How would I go about doing this?
3
votes
1answer
518 views

Spoofing or removing DHCP client hostname in response to DHCP server

In linux, when my machine requests an IP address it also sends the hostname back to the DHCP server. How can I stop my machine from sending back this hostname? I use dhclient, possibly via ...
3
votes
1answer
271 views

How to deny access to specific port when destination is NOT a specific host?

I'm trying to DENY access to port 1000 when it is being accessed through any host or IP that is NOT a specific host. I.e. If I try to access the service on sub.domain.com:1000 I should get in. If I ...
3
votes
1answer
292 views

Obtain the “pretty” hostname in bash

On my Fedora 19 system, I am able to change the system hostname with hostnamectl. This allows me to set several things, such as the static (normal) hostname, as well as a "pretty" hostname. Is there ...
3
votes
1answer
551 views

What is the difference between hostname, hostname --fqdn, and hostname -A

I have a machine I changed the hostname of. I changed it in /etc/hosts, /etc/sysconfig/network, and with hostname command. hostname returns the correct shortname, hostname --fqdn returns the expected ...
3
votes
3answers
3k views

How to request a hostname from a DHCP server on Ubuntu?

I have an Ubuntu 11.04 server virtual machine. I would like to request a specific hostname from the DHCP server at the office. Since I don't run it often, the IP changes nearly every time that I boot ...
3
votes
1answer
88 views

why are there different formats for the hosts file between OpenSuSE and Ubuntu?

How is 127.0.0.1 related to 127.0.0.2? Using ssh to login to tleilax (OpenSuSE): tleilax:~ # tleilax:~ # hostname tleilax tleilax:~ # tleilax:~ # hostname -f tleilax.bounceme.net tleilax:~ # ...
3
votes
1answer
5k views

Postfix email bounced (mail for domain loops back to myself)

I have problem when i send a mail to example@orbialia.es for example2@orbialia.es My emails has bounced for this error: status=bounced (mail for orbialia.es loops back to myself) May 9 09:33:58 ...
3
votes
1answer
1k views

rsyslog using short hostname

I'm using CentOS 6.5 and rsyslogd: Name : rsyslog Arch : x86_64 Version : 5.8.10 Release : 8.el6 In rsyslog.d's conf file I have: $PreserveFQDN on and ...
2
votes
1answer
710 views

Changing hostname without errors

I tried to change my hostname according to this guide for Debian based system: I edited /etc/hostname I ran /etc/init.d/hostname start Though there are errors. Always when I write a sudo command ...
2
votes
1answer
303 views

ZSH %m prompt escape not working as documented under Debian Linux

The zshmisc man page on my new Debian Squeeze install states, under SIMPLE PROMPT ESCAPES: %m The hostname up to the first `.'. An integer may follow the '%' to specify how many components of the ...
2
votes
3answers
2k views

CentOS 7 hostname will not change

I have two CentOS 7 VM's running in virtualbox. On each of the machines I want to set the hostname and a static IP address. VM1 works just fine. VM2 does not. I did the same thing on both servers so ...
2
votes
3answers
595 views

I changed my hostname, rebooted and lost internet connection

I set a new hostname on my machine using: sudo hostname NEWHOSTNAME Then I restarted, and tried accessing the internet and nothing happened. I checked the hostname and it was set to ...
2
votes
1answer
329 views

Remove a directory level from a website URL

Can anyone tell me how to configure apache to not display a website folder name at the end of a base URL, please? - but only for one out of many websites. Let me describe the scenario ... I have a ...
2
votes
1answer
2k views

Hosts file on server with dynamic DNS?

I am setting up a RHEL-based server that is associated with dynamic DNS from DynDNS, with a domain of, say, "abc.dyndns.org" that is dynamically updated with the server's IP address. I have read that ...
2
votes
1answer
566 views

Short domain name to FQDN expansion

Is it possible to configure where the system will look for the machine if I enter just a short domain name? I work in a grid environment where the machines are many and spread across multiple ...