artodeto's blog about coding, politics and the world - os

howto - debian / ubuntu / linux mint - list all installed packages

nospam@example.com (artodeto) — Tue, 08 May 2012 19:13:00 +0200

dpkg --get-selections

With the upper command on your peferred shell you get a list of all installed packages. By using | less or | grep mypackage it is very handy to filter for criterias.

Want to know more? Follow the links below.
aboutdebian.com/packages
apt-get introduction

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tool - zfs and zpool - command overview

nospam@example.com (artodeto) — Mon, 27 Feb 2012 21:45:00 +0100

Just a quick overview about some zfs and zpool commands.
$tank is used as zpool name.

zpool create $tank mirror c6t0d0p0 c8t0d0p0 | creates zpool in mirror by using two devices. Use -m to add a mountpoint.

zpool create $tank/dataset1 | creates a dataset in zpool $tank

zpool add $tank c11t0d0p0 | adds device to $tank (storageplace increased)

zpool destroy $tank | destroy a zpool

zpool destry $tank/dataset1 | destroy dataset1 in zpool $tank

zpool rename $tank/foo $tank/bar | renames dataset foo to bar

zpool replace $tank c8t0d0p0 c11t0d0p0 | replaces device c8t0d0p0 with c11t0d0p0

zpool offline $tank c8t0d0p0 | take device c8t0d0p0 offline

zpool detach $tank c8t0d0p0 | detach device c8t0d0p0 from zpool

zpool attach $tank c11t0d0p0 | attach device c11t0d0p0 from zpool

zpool history -i $tank | shows history of $tank

zpool get all $tank | returns all properties from $tank

zpool get option $tank | get option from $tank

zpool set option=value $tank | set option with value to $tank

zpool iostat [$pool $intervallInSeconds] | i/o performance monitor

zpool import $tank | imports $tank into system. Use -a to import all available zpools

zpool status [$tank] | status monitor

zpool export $tank | export $tank from system (importent if you want to use this tank in an other environment)

zpool scrub $tank | verify integrity of every blog of a data in $tank. Use -s to stop scrubbing.

zfs list [-t (type), -r (recursive)] | list available (imported) zpools

zfs snapshot $tank@backup | creates snaphot "backup" from $tank

zfs rollback $tank@backup | return $tank to dataset $backup

zfs destroy $tank@backup | destroy snapshot "backup"

zfs send -R $tank@backup | zfs receive -d $backuptank | creates backup zpool

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howto - mount filesystem via ssh using sshfs

nospam@example.com (artodeto) — Wed, 25 Jan 2012 23:40:00 +0100

First of all, you have to install "sshfs".
After that you just have to type.

sshfs $user@$host:/path/to/dir /path/to/mount

If fuse throws an error of permission, you have to add your user to the group fuse by typing:

usermod -a -G fuse $user

After you re-logged-in you can see by typing "groups" in your shell that everything is done fin.
Do not want to logoff? Try

su $user

in your shell. This is a new login and so your new group is available now.

Just another hint, if you want to access symbolic links, try:

-o follow_symlinks

and/or

-o transform_symlinks

The man page will help you to understand what you are doing.

Now put everything as an alias in your bashrc (or something similar) and you are done .

alias mountMyShare="sshfs $user@host:/path/to/dir /path/to/mount -o follow_symlinks";
alias umountMyShare="fusermount -u /path/to/mount";

Happy mounting and unmounting.

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Tool - Create Multiboot USB Stick - windows linux

nospam@example.com (artodeto) — Wed, 04 Jan 2012 18:46:00 +0100

Since the capacity of usb sticks are raising and raising, it would be a perfect deal to have "one usb stick for all live operation systems".

For that reason, the boys and girls from sardu have created a beautiful windows tool for you. It is so simple and quite powerful that you just need to download, use and donate to it!

pendrivelinux.com
sarducd.it

Wait, you are already on the right os side with the cookies and also want to have a tool like that?

Try to use liveusb.

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Tool - pcmanfm and qtfm - file manager tabbed browsing open source

nospam@example.com (artodeto) — Fri, 09 Dec 2011 17:44:00 +0100

While browsing through the web and "in the search of the perfect file manager", i found one that comply my requirements quite well.

The requirements are "tabbed browsing", lightweight and fast. I don't need any kind of skinning/theming or eye candy stuff. While reading a lot like 10 file managers for linux or 10 file managers for ubuntu and trying them out a lot, i'm stucked with pcmanfm. This file manager is fast, has tabs and also bookmarks.

Yesterday a friend of mine found another one called qtfm.org. With qtfm, you can easily integrate scripts and use them via hot keys. It is smart two, so i just use pcmanfm "because i use it". But maybe qtfm has the benefit you are searching for.

Why no twin-panel filemanger? The answere is simple, two panels are not enough when i'm sorting files. I know i can use double commander but ... wellm you've already readed the because .

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Grub 2 - re-/install, adjust, configure

nospam@example.com (artodeto) — Sat, 05 Nov 2011 23:32:00 +0100

Grub, the grand unified bootloader is out in its second version (for quiet a while) and a lot has changed. Today was the first day where i have to deal with the new version, so it is time to write down the knowledge i earned .

After upgrading from windows xp to windows 7, the microsoft os acts as child and replace the grub with its one boodloader. So at this point nothing changes from xp to litle seven . My task was to restor the grub 2 into the mbr to regain access to my lovely linux.
After reading some howto's, i tried it with by doing the lazy way.

Start a linux live cd (or a live cd with an grub 2)
fdisk -l (to see what partitions and disk are there and find your linux/root partition
mount /dev/$linuxdisk$linuxpartition (e.g. sda2) /mnt
chroot /mnt
grub-install --root-directory=/mnt /dev/$linuxdisk

Nothing to explain left for this task. But what if you want to adjust the grub? There are two screws for twisting on. First the file /etc/default/grub contains a lot of general settings. Second, the files in /etc/grub.d/ representing your boot options. Just take a look into the scripts, the help ans answeres are in there.

And here are some links.
GRUB 2 bootloader - Full tutorial
grub on wikipedia.org
archlinux.org/grub2
ubuntuusers.de/grub_2

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windows - fix mbr without having a windows xp cd

nospam@example.com (artodeto) — Sun, 16 Oct 2011 23:23:00 +0200

So the problem is to restore the mbr without having a windows xp cd.
It is also possible that you windows xp cd has a problem with your sata device .

What you need to do?

Download gparted: link

Put gparted on a usb stick, cdrom, whatever you prefer

Start the geparted and start "TestDisk"

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MilaX - the open solaris mini cd os

nospam@example.com (artodeto) — Sun, 02 Oct 2011 05:24:00 +0200

Try to mess around with the open solaris environment but don't want to boot up (or download) a fully fledged openindiana?

A answer could be MilaX.

MilaX is a small size Live CD distribution which runs completely off a CD or a USB pendrive. It is based on OpenSolaris and includes its basic features.

Whats on wikipedia about MilaX?

MilaX is an OpenSolaris Live CD distro designed to fit on a business-card sized miniCD. x86 and SPARC versions are downloadable in bootable ISO 9660 and USB disk images. The Live CD can also be used to install the operating system to a hard disk through with ZFS-boot support. MilaX can be successfully loaded in Vmware, Qemu and VirtualBox. Still small, it features light applications such as JWM, Beaver, Urxvt, Vim, Sylpheed, Midnight Commander, Midori, XMMS, ePDFView, VNC viewer, Rdesktop, Conky. By installing the SVR4 and IPS add-ons, you can basically convert MilaX into OpenSolaris. MilaX booted into JWM Desktop in about ~14 seconds on SSD drive.

source

The whole cool stuff is include like:

DTrace
IPMP
SMF
snoop
Crossbow
Solaris Cluster
ZFS
and more...

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MeeGo is dead, Tizen is born

nospam@example.com (artodeto) — Thu, 29 Sep 2011 07:12:00 +0200

After a half year of tumbling the end is clearly near, MeeGo is dead and Tizen is born. Bad news for MeeGo. Maybe the year 2011 will be go down in history as "the mobile device os dying". MeeGo and WebOS were both exciting pieces of software. Especially WebOS with its Mojo SDK was far more ahead. But when big players shows there teeth, something dies.

So lets start, again, from the scratch and write a new OS for mobile devices.

So whats Tizen all about?

Tizen is an open source, standards-based software platform supported by leading mobile operators, device manufacturers, and silicon suppliers for multiple device categories, including smartphones, tablets, netbooks, in-vehicle infotainment devices, smart TVs, and more. Tizen will offer an innovative operating system, applications, and a user experience that consumers can take from device to device.

Source
I will keep an eye on it .

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Easy to use screenshoot tool for linux -> Xfce4-Screenshooter

nospam@example.com (artodeto) — Mon, 26 Sep 2011 07:47:00 +0200

Xfce4 Screenshooter

This application allows you to capture the entire screen, the active window or a selected region. You can set the delay that elapses before the screenshot is taken and the action that will be done with the screenshot: save it to a PNG file, copy it to the clipboard, open it using another application, or host it on ZimageZ, a free online image hosting service.

Thats what the developer site is writing about this tool.

On my point of view, it is easy to use, has a small memory footprint and works quite well.

If you have another tool that is better or has other advantages, throw it in as a comment .

While you are using something like "fbrun", a softlink in your "/usr/bin" as "ln -s xfce4-screenshoot screenshoot" should speed up your daily business (so you have to tip "screen" and hit the "tab"-button).

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Use of uninitialized value $text in concatenation (.) or string at /usr/share/perl5/Text/WrapI18N.pm line 101, line 5. substr outside of string at /usr/share/perl5/Text/WrapI18N.pm line 130,
nospam@example.com (artodeto) — Mon, 19 Sep 2011 20:54:38 +0200

After stumbling more then three times over this Problem. It is time to support the solution made in the crunchbanklinux.org forum.

Use of uninitialized value $text in concatenation (.) or string at /usr/share/perl5/Text/WrapI18N.pm line 101, line 5.
substr outside of string at /usr/share/perl5/Text/WrapI18N.pm line 130, line 5.

On line 130 of /usr/share/perl5/Text/WrapI18N.pm you can find:

$r = substr($string, $l);

By replacing this line with the following code, the dist-upgrade works.

if (length($text) < $l) {
$r = '';
} else {
$r = substr($string, $l);
}

Thats it, thanks Tuqatuae for this solution. Not to mention that i know why perl is not on my favorit side .
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Change session lifetime for phpmyadmin

nospam@example.com (artodeto) — Mon, 12 Sep 2011 19:40:00 +0200

Be aware that this can be security problem if you increase the session lifetime on a productive machine. Just do it on your local development machine where the database does not handle any sensitive data or informations.

So far for the service announcements .

Are you tired of logging in every 30 minutes to the phpmyadmin (currently it is unimportant that there is a mysql cli and tools like tora outside)?

Just edit your configuration file. This file should be in the path "/etc/phpmyadmin" (on debian) and is called "config.inc.php". In this file, you just have to add the following line to increase the session time to four hours.

$cfg['LoginCookieValidity'] = 14400;

You want to know more? Take a look at the phpmyadmin wiki

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SmartOS - The Complete Modern Operating System?

nospam@example.com (artodeto) — Mon, 12 Sep 2011 19:39:00 +0200

SmartOS incorporates the four most revolutionary OS technologies of the past decade — Zones, ZFS, DTrace and KVM — into a single operating system, providing an arbitrarily observable, highly multi-tenant environment built on a reliable, enterprise-grade storage stack. With the introduction of KVM in SmartOS, you no longer have to give up the power of an enterprise-grade operating system in order to run legacy applications and stacks.

SmartOS turns any server into a highly efficient hosting platform for multi-tenant, machine-to-machine, or storage applications. SmartOS offers unique, innovative tools for application developers, service providers and data center operators – tuned and hardened for modern datacenter deployment.

source

Sound exciting, i will give him a try (in the wintermonths of course ).

I also found an entry on heise.de

Ein Entwicklerteam des Cloud-Providers Joyent hat den Hypervisor des Linux-Kernels auf den freien OpenSolaris-Kernel des Illumos-Projekts portiert. Wie die Entwickler schreiben, soll KVM (Kernel-based Virtual Machines) die OpenSolaris-Variante SmartOS um hardwaregestützte Virtualisierung erweitern – als Ergänzung zu der Virtualisierungstechnik Zones des Solaris-Kernels, mit der mehrere Benutzerzumgebungen gegeneinander abgeschottet unter einem Kernel laufen.

SmartOS bringt KVM in den Solaris-Kernel

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Linux top command for network traffic

nospam@example.com (artodeto) — Mon, 12 Sep 2011 19:12:00 +0200

Try to use "netstat -t -u -c" in your terminal.

"-t" stands for "tcp package"

"-u" stands for "udp package"

"-c" stands for "continuously"

If you can and want to install a tool for this, give "iftop" a try.

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Fluxbox themes

nospam@example.com (artodeto) — Sun, 28 Aug 2011 00:24:00 +0200

While search the fluxbox mint theme, if found other where nice themes and a perfect place to search for them.

The fluxbox mint theme is called carp.
Other nice themes are cup, synaptic_dark, green_tea, laser_green and finally centurion_green.

tenr.de also has a snippet section where you can find usefull things like config files, irssi themes and so one.

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Virtualbox could not start - error message says "run /etc/init.d/vboxdrv setup"

nospam@example.com (artodeto) — Sat, 27 Aug 2011 07:44:00 +0200

If you shell outputs something like the following don't get frustrated, the solution is just one apt-get install away!

The error

WARNING: All config files need .conf: /etc/modprobe.d/blacklist, it will be ignored in a future release.
Stopping VirtualBox kernel modules:.
Uninstalling old VirtualBox DKMS kernel modules:.
Trying to register the VirtualBox kernel modules using DKMS:Error! echo
Your kernel headers for kernel 3.0.0-1-686-pae cannot be found at
/lib/modules/3.0.0-1-686-pae/build or /lib/modules/3.0.0-1-686-pae/source.

Failed, trying without DKMS ... failed!
Recompiling VirtualBox kernel modules:
Look at /var/log/vbox-install.log to find out what went wrong ... failed!

The solution

apt-get install linux-headers-3.0.0-1-686-pae
/etc/init.d/vboxdrv setup

You see, your system just needs the current kernel header file and thats it.

Thanks zzeroo for the the hint

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Free Nas systeme (out of the box)

nospam@example.com (artodeto) — Sat, 30 Jul 2011 23:47:00 +0200

Es ist mal wieder soweit, nachfolgend eine Liste mit freien NAS Betriebssystemen. Der Fokus bei dieser Liste liegt darin, dass die Systeme schon alles wichtige mitbringen, um schnellst möglich ein NAS aufbauen zu können.

Auf Grund des eingesetzten/unterstützten Dateisystems ZFS stechen hierbei napp-it und FreeNAS heraus.

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