I Ubuntu, Therefore, I Am
Hi,
Everytime when I use sudo in a terminal I get the following message:
jan@2-Quad:~$ sudo ls -l
sudo: unable to resolve host 2-Quad
[sudo] password for jan:
ls -l is just an example instruction.
I gave my computer the name 2-Quad, so that's the host name. But what does the message mean and how can I make it go away? I don't see that something is not working, I just get the message. Can somebody tell me what is wrong, where it is wrong and how to change it?
Thanks,
DeMus
Quad Shot of Ubuntu
The error message means that the system is unable to translate your system's hostname into an IP address. The easiest way to fix this is to update your /etc/hosts file. Find a line that looks like:
Change it toCode:127.0.0.1 localhost.localdomain localhost
That should make the error go away.Code:127.0.0.1 localhost.localdomain localhost 2-Quad
Hal Pomeranz, Deer Run Associates
[[ Various Linux/Unix related documents ]]
[[ Command-Line Kung Fu blog ]]
Gee! These Aren't Roasted!
That seems like a wierd error. Do we know why it happened to him? Seems like something that shouldn't happen. Bug?
M
Quad Shot of Ubuntu
If the original poster changed the system hostname after the initial install, it seems possible to me that the hostname may not have been propagated to all necessary system files. I'm not sure I'd call it a bug until I know exactly how the hostname change was done.Originally Posted by molotov00
DeMus, can you describe exactly how you changed the name of your machine?
Hal Pomeranz, Deer Run Associates
[[ Various Linux/Unix related documents ]]
[[ Command-Line Kung Fu blog ]]
Ubuntu Developer
Could be related to https://bugs.launchpad.net/ubuntu/+s...er/+bug/185209
I Ubuntu, Therefore, I Am
I don't know why but it worked. Thanks for the help. Can you also explain it to me?
DeMus
Quad Shot of Ubuntu
Sure. The problem was that there was no configuration on your system to allow it to convert your machine's hostname into an IP address. That's what the error message "unable to resolve host 2-Quad" means-- to "resolve" a host means to convert that name into an IP.
Name resolution can happen in any one of several ways. On many networks you use DNS for name resolution, but there's also networked databases such as LDAP and NIS. Failing that, you can use /etc/hosts files, which is what I had you configure here.
Each line in the /etc/hosts file lists an IP address and one or more host names associated with that IP. All I told you to do was to add your machine's hostname to the /etc/hosts entry for the loopback interface (127.0.0.1). sudo doesn't care which interface IP it gets when trying to resolve your hostname, just that it gets something as a result of the lookup. Once you added the name to a valid entry in the /etc/hosts file, sudo was satisfied and stopped throwing the error.
Hal Pomeranz, Deer Run Associates
[[ Various Linux/Unix related documents ]]
[[ Command-Line Kung Fu blog ]]
I Ubuntu, Therefore, I Am
No, I can not. It must have happened when I tried to install and configure Samba, but I can not tell you anymore what I had to do to make Samba work. I'm sorry.
DeMus
First Cup of Ubuntu
hi,
im a new user of ubuntu and i now have this "unable to resolve host problem". i tried "sudo gedit/etc/hosts" changed the host name in the first line but still no luck.and now i dont know how to find the line 127.0.0.1 localhost.localdomain localhost.
i need urgent help and i need to get rid off a recycler once the terminal starts accepting my commands.
Caffeine Fueled
Press Alt-F2 and type:
this will open /etc/hosts in gedit the file should look something like this:Code:gksu gedit /etc/hosts
JimCode:cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 jack 192.168.1.200 willy 192.168.1.202 minibuntu 192.168.1.1 router # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts
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