Unable to resolve host ошибка

Kit SundeKit Sunde

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Two things to check (assuming your machine is called my-machine, you can change this as appropriate):

1. That the /etc/hostname file contains just the name of the machine.

2. That /etc/hosts has an entry for localhost. It should have something like:

    127.0.0.1    localhost.localdomain localhost
    127.0.1.1    my-machine
   

If either of these files aren’t correct (since you can’t sudo), you may have to reboot the machine into recovery mode and make the modifications, then reboot to your usual environment.

Edit /etc/hosts and append your new hostname to the 127.0.0.1 line (or create a new line if you prefer that).

Mine looks like:

127.0.0.1       localhost localhost.localdomain penguin

# 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

Replace penguin in the above example by your new hostname as stated in the /etc/hostname file.

Add your hostname to /etc/hosts like so:

echo $(hostname -I | cut -d\  -f1) $(hostname) | sudo tee -a /etc/hosts

answered Sep 15, 2014 at 16:03

Note, this is an answer to this question which has been merged with this one.

Your hostname (dave00-G31M-ES2L) is not represented in /etc/hosts. Add an L to this line:

127.0.1.1   dave00-G31M-ES2

So it becomes:

127.0.1.1   dave00-G31M-ES2L

In order to accomplish this, open a console (press Ctrl+Alt+T) and type:

sudo gedit /etc/hosts

Add the letter L as mentioned, save and exit.

I had this issue when I was using ubuntu on a VPS. I solved it editing /etc/hosts file.

run this command:

sudo nano /etc/hosts

and then add:

127.0.0.1   localhost.localdomain localhost
127.0.1.1   ubuntu

I hope that will solve your issue

PS: Remember to reboot your computer!

answered Apr 1, 2013 at 1:18

I was having the same issue even though the hostname in my /etc/hostname file and /etc/hosts file matched.

My hostname was «staging_1». It turns out that you can’t have an underscore in your hostname, which is why I was getting this error. Changing the underscore to a hyphen fixed my problem.

answered Aug 13, 2014 at 13:50

answered Jan 15, 2015 at 5:15

The symptom given in the question may correlate strongly with this more specific problem:

$ hostname --fqdn
hostname: Temporary failure in name resolution

There are different ways that this could be resolved, one of which is to add your hostname as localhost in /etc/hosts (as shown in several other answers). This may be the right thing to do in general, but it isn’t the only possible resolution.

A «fully qualified domain name» may be supplied by an external DNS server or similar (if such is available on your network). In this case, sudo will not complain, despite the missing entry in /etc/hosts.

Note: sudo attempts to dereference the hostname, even though it isn’t necessarily required, due to optional capabilities in the sudoers file. See sudo command trying to search for hostname.

As long as the delay isn’t too long, this error message is typically harmless.

answered Sep 18, 2017 at 22:17

dashohoxhadashohoxha

3224 silver badges12 bronze badges

user93581user93581

1171 silver badge2 bronze badges

Some terminal emulators will not update prompt with the correct hostname until you close and restart the emulator (lxterminal, I’m talking to you).

I spent 30min fighting with this error after editing my hostname and hosts files and running sudo service hostname restart until I ran sudo hostname and saw that the hostname was the new value, even though the prompt was showning the old value.

answered Jun 19, 2016 at 16:29

XandruCeaXandruCea

1531 silver badge5 bronze badges

Sorry I can’t help you much but, since it says «can’t resolve host» try running:

hostname

And see if the output is the hostname of the machine. If not, the problem is the host configuration, not sudo.

answered Aug 31, 2011 at 19:16

M.G.M.G.

1212 bronze badges

answered Aug 24, 2016 at 15:07

SynthSynth

211 bronze badge

I had the same problem. I solved it by editing the /etc/hosts and /etc/hostname files… on the /etc/hosts file, just edit the top part as shown below.

#vi /etc/hosts
    127.0.0.1   localhost
    127.0.1.1   localhost  myhostname




#vi /etc/hostname
    myhostname

tanmoytanmoy

1011 silver badge4 bronze badges

Kit SundeKit Sunde

11k7 gold badges25 silver badges32 bronze badges

Two things to check (assuming your machine is called my-machine, you can change this as appropriate):

1. That the /etc/hostname file contains just the name of the machine.

2. That /etc/hosts has an entry for localhost. It should have something like:

    127.0.0.1    localhost.localdomain localhost
    127.0.1.1    my-machine
   

If either of these files aren’t correct (since you can’t sudo), you may have to reboot the machine into recovery mode and make the modifications, then reboot to your usual environment.

Edit /etc/hosts and append your new hostname to the 127.0.0.1 line (or create a new line if you prefer that).

Mine looks like:

127.0.0.1       localhost localhost.localdomain penguin

# 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

Replace penguin in the above example by your new hostname as stated in the /etc/hostname file.

Add your hostname to /etc/hosts like so:

echo $(hostname -I | cut -d\  -f1) $(hostname) | sudo tee -a /etc/hosts

answered Sep 15, 2014 at 16:03

Note, this is an answer to this question which has been merged with this one.

Your hostname (dave00-G31M-ES2L) is not represented in /etc/hosts. Add an L to this line:

127.0.1.1   dave00-G31M-ES2

So it becomes:

127.0.1.1   dave00-G31M-ES2L

In order to accomplish this, open a console (press Ctrl+Alt+T) and type:

sudo gedit /etc/hosts

Add the letter L as mentioned, save and exit.

I had this issue when I was using ubuntu on a VPS. I solved it editing /etc/hosts file.

run this command:

sudo nano /etc/hosts

and then add:

127.0.0.1   localhost.localdomain localhost
127.0.1.1   ubuntu

I hope that will solve your issue

PS: Remember to reboot your computer!

answered Apr 1, 2013 at 1:18

I was having the same issue even though the hostname in my /etc/hostname file and /etc/hosts file matched.

My hostname was «staging_1». It turns out that you can’t have an underscore in your hostname, which is why I was getting this error. Changing the underscore to a hyphen fixed my problem.

answered Aug 13, 2014 at 13:50

answered Jan 15, 2015 at 5:15

The symptom given in the question may correlate strongly with this more specific problem:

$ hostname --fqdn
hostname: Temporary failure in name resolution

There are different ways that this could be resolved, one of which is to add your hostname as localhost in /etc/hosts (as shown in several other answers). This may be the right thing to do in general, but it isn’t the only possible resolution.

A «fully qualified domain name» may be supplied by an external DNS server or similar (if such is available on your network). In this case, sudo will not complain, despite the missing entry in /etc/hosts.

Note: sudo attempts to dereference the hostname, even though it isn’t necessarily required, due to optional capabilities in the sudoers file. See sudo command trying to search for hostname.

As long as the delay isn’t too long, this error message is typically harmless.

answered Sep 18, 2017 at 22:17

dashohoxhadashohoxha

3224 silver badges12 bronze badges

user93581user93581

1171 silver badge2 bronze badges

Some terminal emulators will not update prompt with the correct hostname until you close and restart the emulator (lxterminal, I’m talking to you).

I spent 30min fighting with this error after editing my hostname and hosts files and running sudo service hostname restart until I ran sudo hostname and saw that the hostname was the new value, even though the prompt was showning the old value.

answered Jun 19, 2016 at 16:29

XandruCeaXandruCea

1531 silver badge5 bronze badges

Sorry I can’t help you much but, since it says «can’t resolve host» try running:

hostname

And see if the output is the hostname of the machine. If not, the problem is the host configuration, not sudo.

answered Aug 31, 2011 at 19:16

M.G.M.G.

1212 bronze badges

answered Aug 24, 2016 at 15:07

SynthSynth

211 bronze badge

I had the same problem. I solved it by editing the /etc/hosts and /etc/hostname files… on the /etc/hosts file, just edit the top part as shown below.

#vi /etc/hosts
    127.0.0.1   localhost
    127.0.1.1   localhost  myhostname




#vi /etc/hostname
    myhostname

tanmoytanmoy

1011 silver badge4 bronze badges