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

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34
votes
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 192....
32
votes
5answers
220k views

How to change hostname on CentOS 6.5?

I 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 ...
26
votes
2answers
45k 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. ...
16
votes
3answers
49k views

How to change the hostname of a RHEL-based distro?

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 ...
14
votes
2answers
830 views

Host name changed remotely by wifi?

Am am currently visiting TU Wien and today I connected my Debian Linux laptop to their eduroam wlan using wpa_supplicant and the credentials of my home institute - as always when I am visiting another ...
13
votes
3answers
7k 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 ...
13
votes
4answers
14k 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 ...
13
votes
1answer
8k 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?
11
votes
1answer
10k 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?
11
votes
3answers
1k 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.
9
votes
8answers
80k 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
9
votes
4answers
4k 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 ...
8
votes
1answer
131 views

Why does sudo need the loopback interface?

We were trying to install our software on an Ubuntu machine. To do so, we needed root privileges. Basically, all we needed to do was run a runnable jar like: sudo java -jar runnableJar.jar. All such ...
7
votes
2answers
5k 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 ...
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
5answers
2k 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 | ...
7
votes
2answers
18k 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 ...
7
votes
4answers
11k 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 /etc/mail/submit....
7
votes
3answers
6k 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
1answer
513 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
3answers
3k 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 ...
6
votes
3answers
5k 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 ...
6
votes
2answers
8k 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?
6
votes
3answers
17k 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 ...
6
votes
1answer
4k 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 ...
6
votes
1answer
359 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 ...
6
votes
2answers
10k 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 ...
5
votes
3answers
2k views

How to get the computer name (not its hostname)?

All the results of my searches end up having something to do with hostname or uname -n. I looked up the manual for both, looking for sneaky options, but no luck. I am trying to find an equivalent of ...
5
votes
3answers
63k 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 /...
5
votes
2answers
1k 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. ...
5
votes
2answers
38k 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
1answer
861 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
4answers
2k views

How to append / extend zshell completions?

I am using zsh with oh-my-zsh. Unfortunately, oh-my-zsh does not use file ~/.ssh/config for hostname auto-completion (see Issue #1009, for instance). This could easily archived by the following code: ...
5
votes
1answer
8k 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 ...
5
votes
1answer
914 views

Display hostname in GDM3 on Fedora 19 at login screen [closed]

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
4
votes
1answer
119 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
167 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: PS1="\[\u@$(...
4
votes
2answers
2k 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
1answer
467 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 ...
4
votes
1answer
547 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 ...
4
votes
2answers
8k 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
364 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
2k 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 ...
4
votes
1answer
654 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:~ # ...
4
votes
0answers
64 views

Why does connecting using an ssh key fail with one host name but work with others? [closed]

Trying to use an ssh key to a server which has different host names works with some host names, but not with others? Is there some reason why ssh would work that way? E.g. say hostname1.com and ...
3
votes
4answers
3k views

How to show the host name in Linux commandline prompt

I have several VMs and right now my command-line prompt looks like -bash-3.2$; identical on every VM, because it doesn't contain the host name. I need to always see which VM I'm on using hostname ...
3
votes
2answers
276 views

How to change the part after root@

For example. [root@ip-10-0-7-225 ~]# I edited /etc/hosts but it didn't work.
3
votes
1answer
1k 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
2answers
956 views

Prevent dhcpcd from setting hostname

How to prevent dhcpcd from setting hostname got from server? Change of it breaks a lot of things (including X session). My current distribution is Gentoo, init system is systemd and dhcpcd is spawn ...
3
votes
1answer
60 views

Check presence of a hostname under custom port in known_hosts

I need to add a check if the hostname is already present in the known_hosts. Normally I would do something like that: ssh-keygen -H -F hostname However, that does not seem to work for me in this ...