sudo: unable to execute /bin/su:

ruffrider · 09-19-2013, 04:25 AM

Hello

I'm new to this forum, I hope you can help me.
I am a beginner in system administration, and I encountered a problem.
I have a user "abc" can not mount root when ssh connects with his account, and after that tape sudo su -
this error:
sudo: unable to execute / bin / su: Resource temporarily unavailable
and yet it is added to the sudoers file:
abc ALL = (ALL) ALL

thank you for your help

bkcreddy17 · 09-19-2013, 05:10 AM

Can you try,

abc ALL=(ALL:ALL) ALL

ruffrider · 09-19-2013, 05:15 AM

I already tried it, and it's the same thing, this method I found in the sudoers file Debian OS, by cons in my case, I use centos.

Thank you for your response.

ruffrider · 09-19-2013, 05:52 AM

Help me please

SAbhi · 09-19-2013, 05:59 AM

add user abc to group wheel and MAKE a similar entry in sudoers for wheel.. although for wheel it should already be there.. you just have to uncomment it.

bkcreddy17 · 09-19-2013, 06:04 AM

What is the output of user abc for the command,

sudo -l

ruffrider · 09-19-2013, 06:14 AM

I already try to assign the user abc to the wheel group and uncomment the line %wheel in the sudoers file, and it did not work too!

thank you for your intervention

the output of the command sudo-l is:

Matching Defaults entries for AdmiNet on this host:
requiretty,! visiblepw, always_set_home, env_reset, env_keep = "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS" env_keep + = "MAIL PS1 PS2 QTDIR
USERNAME LANG LC_CTYPE LC_ADDRESS "env_keep + =" LC_COLLATE LC_MESSAGES LC_IDENTIFICATION LC_MEASUREMENT "env_keep + =" LC_MONETARY LC_NUMERIC lc_name
LC_PAPER LC_TELEPHONE "env_keep + =" LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY "secure_path = / sbin \ :/ bin \ :/ usr / sbin \ :/ usr / bin

User AdmiNet Following the May run commands on this host:
(ALL) ALL
(ALL) ALL

Thank you

Firerat · 09-19-2013, 06:29 AM

hmm

you are using sudo to get root so you can execute su - to get a root login shell

Code:

sudo -i

does the same

or

Code:

sudo bash -l

Firerat · 09-19-2013, 06:34 AM

Oh, and undo all the wheel nonsense..

looks like you have ubuntu,
by default your first Account has the group sudo, and you have this in /etc/sudoers

Code:

%sudo	ALL=(ALL:ALL) ALL

ruffrider · 09-19-2013, 07:17 AM

no positive result!
I added '%root' in sudoers file , it's the same thing! !!!!!!!

Yes, i can execute su - , but the user must use his password, not the password of the root

Firerat · 09-19-2013, 07:24 AM

what happens when the user does

Code:

sudo -i

man sudo

Code:

  -i [command]
                 The -i (simulate initial login) option runs the shell specified by the password database entry of
                 the target user as a login shell.  This means that login-specific resource files such as .profile
                 or .login will be read by the shell.  If a command is specified, it is passed to the shell for exe‐
                 cution via the shell's -c option.  If no command is specified, an interactive shell is executed.
                 sudo attempts to change to that user's home directory before running the shell.  The security pol‐
                 icy shall initialize the environment to a minimal set of variables, similar to what is present when
                 a user logs in.  The Command Environment section in the sudoers(5) manual documents how the -i
                 option affects the environment in which a command is run when the sudoers policy is in use.

ruffrider · 09-19-2013, 07:34 AM

#sudo-i
[sudo] password for adminet:
sudo: unable to execute /bin/bash: Resource temporarily unavailable

The difference is that now it display /bin/bash, not /bin/su

have you ever seen this?

Firerat · 09-19-2013, 07:43 AM

looks like you have hit some limits

never seen it myself

http://www.centos.org/modules/newbb/...36886&forum=40

and you can get more background with a websearch on that error ( the whole line )

ruffrider · 09-19-2013, 08:12 AM

the hope is lost!

Firerat · 09-19-2013, 08:19 AM

what is the output of

Code:

/sbin/sysctl fs.file-nr