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unable to sudo on Chameleon Cloud Ubuntu Virtual Machine #246

Open mmccombe opened 7 years ago

mmccombe commented 7 years ago
SUMMARY

After booting Ubuntu-Server-14.04-LTS Virtual Machine on Chameleon Cloud using Cloudmesh client, associating a floating IP, and connecting via ssh, the following error message is returned when trying to run any sudo command. This issue may not be related to Cloudmesh itself, but Dr. von Laszewski asked me to write up the issue here so he could assign it to someone to research.

cc@mmccombe-021:~$ sudo ls sudo: unable to resolve host mmccombe-021 (mmccombe-021 is the hostname of the machine.

STEPS TO REPRODUCE
fugangwang commented 7 years ago

This appears to be an OS/image specific issue. Can you take a look at the files /etc/hostname /etc/hosts and try to run ‘ping ’. If the hostname appears in the two files, and ping also works, this should not happen. Otherwise, you may manually add the hostname to the ‘127.0.0.1’ line.

On Oct 18, 2016, at 9:44 PM, mmccombe notifications@github.com wrote:

SUMMARY

After booting Ubuntu-Server-14.04-LTS Virtual Machine on Chameleon Cloud using Cloudmesh client, associating a floating IP, and connecting via ssh, the following error message is returned when trying to run any sudo command. This issue may not be related to Cloudmesh itself, but Dr. von Laszewski asked me to write up the issue here so he could assign it to someone to research.

cc@mmccombe-021:~$ sudo ls sudo: unable to resolve host mmccombe-021 (mmccombe-021 is the hostname of the machine.

STEPS TO REPRODUCE

Create virtual machine Connect via ssh Run any command with sudo. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246, or mute the thread https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe.

laszewsk commented 7 years ago

he cant add as sudo does not work ;-)

On Oct 19, 2016, at 11:05 AM, Fugang Wang notifications@github.com wrote:

This appears to be an OS/image specific issue. Can you take a look at the files /etc/hostname /etc/hosts and try to run ‘ping ’. If the hostname appears in the two files, and ping also works, this should not happen. Otherwise, you may manually add the hostname to the ‘127.0.0.1’ line.

On Oct 18, 2016, at 9:44 PM, mmccombe <notifications@github.com mailto:notifications@github.com> wrote:

SUMMARY

After booting Ubuntu-Server-14.04-LTS Virtual Machine on Chameleon Cloud using Cloudmesh client, associating a floating IP, and connecting via ssh, the following error message is returned when trying to run any sudo command. This issue may not be related to Cloudmesh itself, but Dr. von Laszewski asked me to write up the issue here so he could assign it to someone to research.

cc@mmccombe-021:~$ sudo ls sudo: unable to resolve host mmccombe-021 (mmccombe-021 is the hostname of the machine.

STEPS TO REPRODUCE

Create virtual machine Connect via ssh Run any command with sudo. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <https://github.com/cloudmesh/client/issues/246 https://github.com/cloudmesh/client/issues/246>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe>.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246#issuecomment-254841164, or mute the thread https://github.com/notifications/unsubscribe-auth/AAZ8VR4QDCHqxGOPSDwppzPt8Vt_wkLkks5q1jG-gaJpZM4KaeQe.

fugangwang commented 7 years ago

Despite the fact that sudo gives an error, it appears it actually still runs. BTW I can totally replicate the same issue and fix it as such:

cc@vm-001:~$ sudo ls sudo: unable to resolve host vm-001 cc@vm-001:~$ cat /etc/hostname vm-001 cc@vm-001:~$ cat /etc/hosts 127.0.0.1 localhost

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

cc@vm-001:~$ sudo vi /etc/hosts sudo: unable to resolve host vm-001 cc@vm-001:~$ sudo ls cc@vm-001:~$ cat /etc/hosts 127.0.0.1 localhost vm-001

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

Please note this has nothing to do with the cloudmesh tool we are using.

On Oct 19, 2016, at 11:26 AM, Gregor von Laszewski notifications@github.com wrote:

he cant add as sudo does not work ;-)

On Oct 19, 2016, at 11:05 AM, Fugang Wang <notifications@github.com mailto:notifications@github.com> wrote:

This appears to be an OS/image specific issue. Can you take a look at the files /etc/hostname /etc/hosts and try to run ‘ping ’. If the hostname appears in the two files, and ping also works, this should not happen. Otherwise, you may manually add the hostname to the ‘127.0.0.1’ line.

On Oct 18, 2016, at 9:44 PM, mmccombe <notifications@github.com mailto:notifications@github.com <mailto:notifications@github.com mailto:notifications@github.com>> wrote:

SUMMARY

After booting Ubuntu-Server-14.04-LTS Virtual Machine on Chameleon Cloud using Cloudmesh client, associating a floating IP, and connecting via ssh, the following error message is returned when trying to run any sudo command. This issue may not be related to Cloudmesh itself, but Dr. von Laszewski asked me to write up the issue here so he could assign it to someone to research.

cc@mmccombe-021:~$ sudo ls sudo: unable to resolve host mmccombe-021 (mmccombe-021 is the hostname of the machine.

STEPS TO REPRODUCE

Create virtual machine Connect via ssh Run any command with sudo. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <https://github.com/cloudmesh/client/issues/246 https://github.com/cloudmesh/client/issues/246<https://github.com/cloudmesh/client/issues/246 https://github.com/cloudmesh/client/issues/246>>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe<https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe https://github.com/notifications/unsubscribe-auth/ABS9UYPj3vCtR1X4ESrmGJo6Z8oAhQbbks5q1XX7gaJpZM4KaeQe>>.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <https://github.com/cloudmesh/client/issues/246#issuecomment-254841164 https://github.com/cloudmesh/client/issues/246#issuecomment-254841164>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAZ8VR4QDCHqxGOPSDwppzPt8Vt_wkLkks5q1jG-gaJpZM4KaeQe https://github.com/notifications/unsubscribe-auth/AAZ8VR4QDCHqxGOPSDwppzPt8Vt_wkLkks5q1jG-gaJpZM4KaeQe>.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246#issuecomment-254847773, or mute the thread https://github.com/notifications/unsubscribe-auth/ABS9Ue8EZcgCWyzG8fsmC1mSjuAjQ_Bsks5q1jaqgaJpZM4KaeQe.

badmutex commented 7 years ago

@mmccombe does the sudo command actually run (despite the "unable to resolve host" error)?

badmutex commented 7 years ago

I agree with @fugangwang this isn't a cloudmesh issue.

laszewsk commented 7 years ago

I asked student to file it here as this is best way to reach experts ;-) We new it was not cloudmesh …

On Oct 19, 2016, at 11:39 AM, badi notifications@github.com wrote:

I agree with @fugangwang https://github.com/fugangwang this isn't a cloudmesh issue.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246#issuecomment-254851861, or mute the thread https://github.com/notifications/unsubscribe-auth/AAZ8VaxOPc0poCUkNBol-I-TxRCYsghuks5q1jmqgaJpZM4KaeQe.

badmutex commented 7 years ago

It is not really a problem, more an annoyance. If he wants the "unable to resolve host" message to go away, He should follow @fugangwang's comment above.

laszewsk commented 7 years ago

I suggest we do a special add on in our class web page to document this, this will come up with lots of students and we will get lots of questions on this.

On Oct 19, 2016, at 11:47 AM, badi notifications@github.com wrote:

It is not really a problem, more an annoyance. If he wants the "unable to resolve host" message to go away, He should follow @fugangwang https://github.com/fugangwang's comment above.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246#issuecomment-254854356, or mute the thread https://github.com/notifications/unsubscribe-auth/AAZ8VezcUs7UsJONhj8qdUEhgVVxchR3ks5q1juegaJpZM4KaeQe.

mmccombe commented 7 years ago

Thank you. I was originally under the impression that sudo was failing (what I tried to run using sudo failed for other reasons and the unable to resolve host message confused me). As pointed out, sudo was actually working. Also, adding the hostname to /etc/hosts as you directed did stop the message from coming out for me as well.

Thanks again for your help.

Mark

On Wed, Oct 19, 2016 at 11:47 AM, badi notifications@github.com wrote:

It is not really a problem, more an annoyance. If he wants the "unable to resolve host" message to go away, He should follow @fugangwang https://github.com/fugangwang's comment above.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/cloudmesh/client/issues/246#issuecomment-254854356, or mute the thread https://github.com/notifications/unsubscribe-auth/AVklc9pgQLQiRqJ_nDAhwmB_PYde6_uYks5q1jufgaJpZM4KaeQe .