RSINFOMINDS: 21 Jun 2014

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Saturday, 21 June 2014

Delete a Oracle DB using DBCA In Silent Mode

Make Sure You Stop The DB "ORCL" Using > shutdown command.

How To Manually Reboot The HMC

Below are the pictures that would show how to reboot the HMC Manually.

How To Find The Users With Empty Password

/etc/shadow is the file which we look for password information.

/etc/shadow content:
===============

scott:!!:16236:0:99999:7:::
peter:!!:16236:0:99999:7:::
kevin:!!:16236:0:99999:7:::

This is actual content for a default user/new user.

[root@node1 /]# passwd -d scott
Removing password for user scott.
passwd: Success
[root@node1 /]# passwd -d peter
Removing password for user peter.
passwd: Success
[root@node1 /]# passwd -d kevin
Removing password for user kevin.
passwd: Success

scott::16236:0:99999:7:::
peter::16236:0:99999:7:::
kevin::16236:0:99999:7:::

The above is the content after remving the password for the user using the command # passwd -d

[root@node1 /]# cat /etc/shadow | awk -F: '($2==""){print $1}'
scott
peter
kevin
[root@node1 /]#

Now the above script will give the list of users with EMPTY PASSWORD.

pam_tally2 - The login counter (tallying) module

I have set up PAM Authentication to lock a user accoount after 3 attempts of incorrect password.

PAM Module: pam_tally2.so

password-auth-ac:
=============

auth required pam_tally2.so deny=3 file=/var/log/tallylog

account required pam_tally2.so

[root@node1 /]# pam_tally2 --user test

test 0

[root@node1 /]#

test@192.168.183.148's password:

Access denied

test@192.168.183.148's password:

Access denied

test@192.168.183.148's password:

Access denied

test@192.168.183.148's password:

Access denied

test@192.168.183.148's password:

Account locked due to 4 failed logins

Account locked due to 5 failed logins

Account locked due to 6 failed logins

Account locked due to 7 failed logins

Last login: Sun Jun 15 00:14:30 2014 from 192.168.183.1

[test@node1 ~]$

[root@node1 /]# pam_tally2 --user=test

test 6 06/15/14 00:23:20 192.168.183.1

[root@node1 /]# pam_tally2 --user=test --reset

test 6 06/15/14 00:23:20 192.168.183.1

[root@node1 /]# pam_tally2 --user=test

test 0

[root@node1 /]#

test@192.168.183.148's password:

Last login: Sun Jun 15 00:20:07 2014 from 192.168.183.1

[test@node1 ~]$ whoami

test

[test@node1 ~]$