Silicon Technix

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ORA-28002: the password will expire within 7 days
Cause: The user’s account is about to about to expire and the password needs
to be changed.
Action: Change the password or contact the database administrator.

Reference: Oracle Documentation
[roboshot url=”https://blogs.silicontechnix.com/?p=945″ width=”80″ newpage=”TRUE”]
Solutions: Read the rest of this entry »

There is a worldwide, highly-distributed WordPress attack that is ongoing on most of the WordPress powered blogs.

The following steps can be used to secure (by password protection) wp-login.php for all WordPress sites in your cPanel account:
How to Password Protect the wp-login.php File
There are two (2) steps in accomplishing this. First you need to define a password in the .wpadmin file, and then you activate the security in the .htaccess file. Read the rest of this entry »

Physical access is everything, it is almost impossible to prevent machine access/password break if somebody else got physical access to some Linux machine.

But there are some steps you can make somebody work hard to access the machine physically (provided they have good knowledge of Linux). Read the rest of this entry »

Recently when my servers HDD dead, data center installed a new HDD keeping orginal HDD as secondary so that i can copy data back to new HDD.

I tried to mount the HDD normal way, but got the error:-

[root@server78 ~]# fdisk -l /dev/hda
 
 Disk /dev/hda: 160.0 GB, 160041885696 bytes
 255 heads, 63 sectors/track, 19457 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/hda1   *           1          13      104391   83  Linux
 /dev/hda2              14       19457   156183930   8e  Linux LVM
 
 [root@server78 ~]# mount /dev/hda2 /tmp/mnt
 mount: /dev/hda2 already mounted or /tmp/mnt busy

The old drive is lvm. you were trying to mount it like it was an ext3 filesystem. I have listed what i did below so you can see it.

Now we need to check the old disk is using LVM ? type:-

[root@server78 ~]# pvs
PV         VG         Fmt  Attr PSize   PFree
/dev/hda2  VolGroup01 lvm2 a-   148.94G 32.00M
/dev/hdb2  VolGroup00 lvm2 a-   114.94G 96.00M

So now we know our second hard disk VolumeGroup name is “VolGroup00”, now we can mount it like:-

[root@server78 ~]# mount /dev/VolGroup01/LogVol00 /mnt

That’s it, you can see the folders in /mnt/, Edit/copy as you like.

If you just forgot our webmin admin password and failed to logging to your webmin account and after several tries your Webmin blocked your IP you need to follow following steps to reset your webmin admin/root/master password:-

1. Login to your box as root.
2. If you are running a RedHat distribution (i.e. Fedora, CentOS, Gentoo), enter the following

   /usr/libexec/webmin/changepass.pl /etc/webmin username password

   If you are running a Debian distribution, enter the following command:

   /usr/share/webmin/changepass.pl /etc/webmin username password
   

3. You are almost done.

4. Now you can Login to Webmin with your new password you just reset.