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Archive for August, 2012

Access virtualbox shared folders from Ubuntu and fix ruined ubuntu installation.

Aug 19

Posted by smartman in Beginners, Linux, security, tips & tricks, ubuntu, virtualbox | 1 Comment

If you are running Ubuntu virtualbox guest then you cannot access the shared folder under /media/shared with regular user. However you can fix this by adding your user to vboxsf additional group.

Important! make sure you append the additional group so that other groups are not removed! Run te command below as exactly as seen and replace you username. If the permission is not applied immediately then reboot.

usermod -a -G vboxsf username

In case you forgot flag -a then it is bad but not hopeless :) Read the rest of this entry »

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Recover virtualbox guest from failing snapshot

Aug 12

Posted by smartman in Linux, ubuntu, virtualbox | No Comments

When making snapshot of running virtualmachine guest the process got stuck and left below traces in logfile. I had to kill hte snapshot process and reboot machine to continue.

vboxmanage snapshot mymachine take initial
00:00:14.576 PCNet#0: The link is back up again after the restore.
00:03:47.980 Changing the VM state from 'RUNNING' to 'RUNNING_LS'.
00:03:48.014 
00:03:48.014 !!R0-Assertion Failed!!
00:03:48.014 Expression: <NULL>
00:03:48.014 Location  : /build/buildd/virtualbox-4.1.12-dfsg/src/VBox/VMM/VMMAll/PGMAllBth.h(1458) void pgmR0BthEPTProtSyncPageWorkerTrackDeref(PVMCPU, PPGMPOOLPAGE, RTHCPHYS, uint16_t, RTGCPHYS)
00:03:48.014 HCPhys=00000000d5a37000 wasn't found!

After  reboot i see:

# vboxmanage list vms
"<inaccessible>" {d1d42d8a-38ed-4d6d-95a1-356d2896ff26}

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sh: 2: Syntax error: newline unexpected

Aug 5

Posted by smartman in Linux, tips & tricks, ubuntu | No Comments

Error happened when running perl script on Ubuntu machine after coping it from another.

Issue must have been caused by different encodings and was resolved by removing newline in the middle of the command.

        # Monthly Backup
        system("$MYSQLDUMP --user=$DB_USER --password='$DB_PASS' $db_name >
$BACKUP_DIR/$db/${db}_monthly_$datestamp.sql");

Changed to

         # Monthly Backup
         system("$MYSQLDUMP --user=$DB_USER --password='$DB_PASS' $db_name > $BACKUP_DIR/$db/${db}_weekly_$datestamp.sql");
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