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Use "sudo" Command without password Prompt

Posted on by Osama Mustafa in Operating system
Sometimes you need to run Linux command without password prompt using sudo command.

to learn more about this command read the link here.

For Example i need to run the following command without password prompt, However there are three sudo commands I want to run without entering password:

  • sudo reboot
  • sudo shutdown -r now
  • sudo shutdown -P now
to do this follow the below steps :-
  • edit the following /etc/sudoers file.
  • you find the following lines depend on the username and hostname for the server.

user host = (root) NOPASSWD: /sbin/shutdown
user host = (root) NOPASSWD: /sbin/reboot

This will allow the user user to run the desired commands on host without entering a password. All other sudoed commands will still require a password.

Notes:

  • Always use the command visudo to edit the sudoers file to make sure you do not lock yourself out of the system for example 

sudo visudo -f /etc/sudoers.d/shutdown

  • Using /etc/sudoers.d instead of modifying /etc/sudoers, you could add the two lines to a new file in /etc/sudoers.d for example  /etc/sudoers.d/shutdown.
  • If you did not use visudo to edit your files and then accidentally messed up /etc/sudoers or messed up a file in /etc/sudoers.d then you will be locked out of sudo.to fix it use command pkexec.
Cheers
Osama Mustafa

/usr/ccs/bin/as: not found/No such file or directory on Solaris 11.2

Posted on by Osama Mustafa in Operating system
While trying to install Oracle Database 12c on Solaris 11.2 the i faced the following the errors in the logs and dbca was unable to start :-

INFO: sh[2]: /usr/ccs/bin/as: not found [No such file or directory]
INFO: make: Fatal error:
INFO: *** Error code 127

The package developer/assembler comes with default installation, But  Solaris 11 package developer/assembler is not installed.

To install it: –

pkg install developer/assembler

and try again.

Cheers
Osama 

OTech Magazine – Summer 2015

Posted on by Osama Mustafa in News
OTech Magazine – Summer 2015 OTech Magazine issue Summer 2015 is the eighth issue of OTech Magazine – the independent Oracle technology magazine – . Our contributors are the best of the best of the Oracle atmosphere.

Osama Mustafa – Database Link From Oracle to MySQL
Read the full version of magazine here.
Thanks Douwe Pieter  for this amazing efforts.
Cheers
Osama Mustafa

My Days As an Oracle ACED : BGOUG

Posted on by Osama Mustafa in News
12 – 14 June save the date because it’s Bulgarian Oracle User group Events, this is my first time in Bulgaria and my first time as an oracle ACE director in any events :).

My Trip Planned to be from Jordan to Bulgaria – Sofia  and as usual i need to stop in one of world airport to reach my destinations first which i really hate because it’s wasting of time and tiring me.
my stop was in Frankfurt airport and to be there i had to spent 5-6 hours in the plane to reach there and then wait another 5 hours in the airport and reach Sofia 3 hours in the plane. but lucky me the plane is delayed in Jordan and i waited for 2 hours only :).
I reach Sofia but i was really exhaust and tired from traveling because my trip started early morning and it’s took us 2 hours to reach the hotel from the airport but even with this i have to thanks one of the best organizer i ever seen Milena Gerova She organized everything very well the hotels, the taxi, the appreciation events & sessions.
I had 2 presentation there about Fusion middleware and like usual i organized RAC ATTACK On Saturday, The audience was really amazing and asking very good questions. 
I had so much fun in Bulgaria and one of the best events i attended, simply it’s really Green every where you look it’s green, and I learned some Bulgarian dance  because i knew everyone in Bulgaria should dance 🙂 Even Tom Kyte was dancing,Svetoslav and Heli as well so why not ? 
It’s really nice to meet old friends and meeting new one  🙂 

Cheers
Osama Mustafa 

ORA-39181: Only partial table data may be exported due to fine grain access control

Posted on by Osama Mustafa in Database
The below error appeared when trying to export the Schema using System User :-

ORA-39181: Only partial table data may be exported due to fine grain access control on “SOAPRD_MDS”.”MDS_DEPL_LINEAGES”
. . exported “SOAPRD_MDS”.”MDS_DEPL_LINEAGES”            5.164 KB       1 rows
ORA-39181: Only partial table data may be exported due to fine grain access control on “SOAPRD_MDS”.”MDS_LABELS”

the weird thing that VPD is not enabled to show this error but once i grant the system the required privileges the error stop appearing in the logs.

grant EXEMPT ACCESS POLICY to System;

Thanks
Osama

OID is Down For Ambiguous Reasons

Posted on by Osama Mustafa in Fusion Middleware
Today one of the customer called complaining about accessing to the system and how its not working ? Since everything is configured as single sign on (SSO) first thing to check was OID or oracle internet Directory.

The logs indicate to the below error :-

[2015-05-01T07:00:18+03:00] [OID] [NOTIFICATION:16] [] [OIDMON] [host: MOAPRDOID1] [pid: 5244] [tid: 0] Guardian: [oidmon]: Unable to connect to database,
will retry again after 10 sec

[2015-05-01T07:00:28+03:00] [OID] [NOTIFICATION:16] [] [OIDMON] [host: MOAPRDOID1] [pid: 5244] [tid: 0] Guardian: Connecting to database, connect string is oiddb

[2015-05-01T07:00:28+03:00] [OID] [NOTIFICATION:16] [] [OIDMON] [host: MOAPRDOID1] [pid: 5244] [tid: 0] Guardian: [gsdsiConnect] ORA-12514, ORA-12514: TNS:listener does not currently know of service requested in connect descriptor.

from the above error the OID is unable to connect to database server i checked database and listener everything is up without any issue and all the other application working without any issues.

after investigation I checked the sqlnet.ora and add the following :-

SQLNET.AUTHENTICATION_SERVICES= (NONE)
NAMES.DIRECTORY_PATH= (TNSNAMES)

Restart the services and everything is working.

maybe this solution will not lead or help in so many cases i am working to know why this will effect on OID since it’s was working without any issues for 1 year

Thanks
Osama 

Enable Database Vault Using chopt Command

Posted on by Osama Mustafa in Database
I post before how to enable oracle database vault using make command, in this post i will talk about how to enable database vault but using chopt command which easier and faster.

Common Syntax :-
chopt [enable | disable] db_option

Value
Description
dm
Oracle Data Mining Database Files
dv
Oracle Database Vault
lbac
Oracle Label Security
olap
Oracle OLAP
partitioning
Oracle Partitioning
rat
Oracle Real Application Testing
ode_net
Oracle Database Extensions for .NET 1.x
ode_net_2
Oracle Database Extensions for .NET 2.0

Like the other way you need to shutdown database, listener and dbconsole
cd $ORACLE_HOME/bin
chopt enable lbac
and Start database, listener, and dbconsole , Enterprise should be configured to access database vault.
Cheers
osama