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Sudo on AIX



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RPM is available from IBM AIX toolbox.

To install:

Step 1: Download rpm -i sudo-1.6.7p5-3.aix5.1.ppc.rpm from IBM aix toolbox

Step 2: Copy /etc/sudoers from NTI2171 to the server or just uncomment the line in the line


Step 3: Create wheel group (15) and enroll into it primary (yourself) and secondary admin for the box.

Step 4: You need to enable syslogd in order fro sudo logging work


rpm is standard way to install programs on linux and is available on AIX by default. For details see man rpm.

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[Oct 10, 2008] Install and configure sudo in AIX - Toolbox for IT Knowledge Sharing Communities

sudo is controlled by its configuration file /etc/sudoers. The program has a rich selection of configuration options and you may like to read the man page for sudoers and examine the sample configuration file which you'll find in sample.sudoers in the source code directory.

The instructions below describe how to create an sudoers file which allows any user to run the /dialup and /hangup scripts defined in Configuring PPP on Solaris to connect to an ISP and allows a particular user to run any command as root.

One potential difficulty is that the /etc/sudoers file must be edited using the visudo program and not directly in your editor of choice. visudo uses the "vi" editor and this means that you need at least a basic understanding of how to use this editor. If you aren't already familiar with vi, you'll have to learn it sooner or later so now's a good time to start! But don't worry if you've never used it before - I'll include enough instruction here to enable you to edit the short file created by the installation process and append a couple of lines to it.

To edit /etc/sudoers, make sure you're logged in as root and type:

  1. /usr/local/sbin/visudo

This starts the vi editor and displays the initial /etc/sudoers file. vi uses what appear at first sight to be commands that aren't exactly intuitive. If you're not familiar with vi, type the following exactly as it appears and note that commands in vi are case sensitive. So don't type a lower-case "g" when the instructions show an upper-case "G".

Move the cursor to the end of the file by typing an upper-case G:


and open a new line just beyond the last line in the file by typing a lower-case o:


vi is now in "edit" mode and anything you type is inserted into the file. If you want everyone (all users) to be able to run the /hangup and /dialup scripts, type the following:

ALL ALL=/dialup,/hangup

with a TAB character after the first "ALL". That line tells sudo that all users are allowed to execute the scripts /hangup and /dialup as if they were root.

If you want to give just one user, say jim, the ability to run the scripts, type the following instead:

jim ALL=/dialup,/hangup

You may like to add another line telling sudo that your own personal user is allowed to do anything as root. Press the ENTER key and, if your own personal user is mike, you'd type:

mike ALL=(root) ALL

again with a TAB character after "mike".

Finally, switch vi back into command mode by pressing the ESCAPE key and exit vi by typing:


followed by ENTER. If you make a mistake at any time, just press the ESCAPE key followed by:


followed by ENTER and vi will return you to the shell command prompt without making any changes to the file.

6. Using sudo:

sudo is simple to use. To execute a command with root privilege, type:

$ sudo name-of-command

If this is the first time you've used sudo since logging in, sudo will ask for your password. The password required at this point is the user's own password, not the root password. So, if you've logged in as user jane and she wants to start a dialup connection to her ISP, she would type:

  1. sudo /dialup

and sudo responds:

We trust you have received the usual lecture from the local System

Administrator. It usually boils down to these two things:

  1. 1) Respect the privacy of others.
  2. 2) Think before you type.


Jane would then type her password and sudo will run the /dialup script for her with root privilege. If further commands are executed using sudo within 5 minutes, it will not ask for a password again.

But if Jane were to try and execute a command without having the necessary permission (as defined in the /etc/sudoers file), sudo will refuse to run it:

$ sudo vi /etc/passwd

Sorry, user jane is not allowed to execute "/usr/bin/vi /etc/passwd" as root on sunbeam.

In this example, sunbeam is the name of the machine.

If you'd prefer not to have to type a password at all, replace the two lines in /etc/sudoers with:

ALL NOPASSWD: ALL=/dialup,/hangup mike ALL=(root) NOPASSWD: ALL

[Sep 19, 2008] trouble with syslog and sudo logs

Please note the for AIX you need to enable syslog first.
John Hines bigjohn_101 at
Wed Jan 23 11:58:35 MST 2002
Hi Todd,

  I made the suggested changes and my sudo logs are no longer going to
/var/log/messages, but they are also not going to /var/log/sudo.log.  This
is the current state of my syslog.conf:

# $FreeBSD: src/etc/syslog.conf,v 2001/02/26 09:26:11 phk Exp $
#       Spaces are NOT valid field separators in this file.
#       Consult the syslog.conf(5) manpage.
*.err;kern.debug;auth.notice;mail.crit          /dev/console
security.*                                      /var/log/security                                       /var/log/maillog                                        /var/log/lpd-errs
cron.*                                          /var/log/cron
*.err                                           root
*.notice;news.err                               root
*.alert                                         root
*.emerg                                         *
# uncomment this to log all writes to /dev/console to /var/log/console.log                                   /var/log/console.log
# uncomment this to enable logging of all log messages to /var/log/all.log
#*.*                                            /var/log/all.log
# uncomment this to enable logging to a remote loghost named loghost
#*.*                                            @loghost
# uncomment these if you're running inn
# news.crit                                     /var/log/news/news.crit
# news.err                                      /var/log/news/news.err
# news.notice                                   /var/log/news/news.notice
*.*                                             /var/log/slip.log
*.*                                             /var/log/ppp.log
# This logs successful and failed sudo attempts to the file
local2.debug                                    /var/log/sudo.log

Thanks for the help,

John Hines

----- Original Message -----
From: Todd C. Miller <Todd.Miller at>
To: John Hines <bigjohn_101 at>
Cc: <sudo-users at>
Sent: Tuesday, January 22, 2002 9:49 PM
Subject: Re: trouble with syslog and sudo logs

> In message <OE16SN2uhoSQD5Y54Qt00012596 at>
> so spake "John Hines" (bigjohn_101):
> > # $FreeBSD: src/etc/syslog.conf,v 2001/02/26 09:26:11 phk Exp $
> > #
> > #       Spaces are NOT valid field separators in this file.
> > #       Consult the syslog.conf(5) manpage.
> > *.err;kern.debug;auth.notice;mail.crit          /dev/console
> > *.notice;kern.debug;;mail.crit;news.err /var/log/messages
> > security.*                                      /var/log/security
> >                                       /var/log/maillog
> >                                        /var/log/lpd-errs
> > cron.*                                          /var/log/cron
> > *.err                                           root
> > *.notice;news.err                               root
> > *.alert                                         root
> > *.emerg                                         *
> > # uncomment this to log all writes to /dev/console to =
> > /var/log/console.log
> >                                   /var/log/console.log
> > # uncomment this to enable logging of all log messages to =
> > /var/log/all.log
> > #*.*                                            /var/log/all.log
> > # uncomment this to enable logging to a remote loghost named loghost
> > #*.*                                            @loghost
> > # uncomment these if you're running inn
> > # news.crit                                     /var/log/news/news.crit
> > # news.err                                      /var/log/news/news.err
> > # news.notice                                   =
> > /var/log/news/news.notice
> > !startslip
> > *.*                                             /var/log/slip.log
> > !ppp
> > *.*                                             /var/log/ppp.log
> > # This logs successful and failed sudo attempts to the file =
> > /var/log/sudo.log
> > local2.debug                                    /var/log/sudo.log
> You need to add "local2.none" after the "news.err" in /var/log/messages
> line.  That will keep sudo messages going to /var/log/messages.
>  - todd

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