Posts filed under ‘Computer’

Minecraft-Server bei Nitrado

nitrado-webinterfaceAuf meinen letzten Artikel über Probleme mit dem Gameserver-Provider sprang gleich jemand von Nitrado an, freundlicher Weise mit einem Gutschein-Code für einen kostenlosen Testserver für 30 Tage (4 Slots, 1024 MB RAM, was die Minimalkonfiguration darstellt).

Anmeldung und Aufladen des Prepaid-Kontos gingen schnell (das “Aufladen” bestand im Eintragen des Gutschein-Codes). Aber auch beim anderen Provider ging dieser Schritt schnell, also war ich verständlicherweise skeptisch.

Dann also gleich mal einen Gameserver anlegen. Grundkonfiguration in allen Punkten bestätigt, dann warten … “Server wird installiert”. Nach 6 bis 7 Minuten war die Installation fertig, und wir legten gleich mal eine Subdomain an (, wenn jemand meine Jungs besuchen möchte :-)). Der Vanilla-Server wurde natürlich umgehend ausprobiert — die Jungs sind mit der Performance vollauf zufrieden.

Als nächstes rein ins Webinterface, wo man den Server verwalten kann (Ausschnitt siehe Bildschirmfoto). Sieht wirklich gut aus. Von Vanilla-Server auf Bukkit-Server umstellen ging schnell und schmerzlos. Es gibt ein Upload-Tool, mit dem man seinen eigenen world-Ordner, seine Mods usw. hochladen kann, so dass man für kleinere Aufgaben dieser Art nicht mal FTP benötigt.

Den FTP-Zugang habe ich wegen der schlechten Erfahrungen beim vorherigen Provider natürlich trotzdem sofort ausprobiert. Er ist richtig schnell. Also alles gut.

Meine Jungs hat es gefreut zu sehen, dass einer der bekannteren deutschen Minecraft-Helden, Gronkh, seine Server ebenfalls bei Nitrado hostet.

2014/12/05 at 20:08

Minecraft-Server bei Host Unlimited

Meine Erfahrung mit Host Unlimited in aller Kürze. Für meine Kinder habe ich einen Account bei diesem Gameserver-Vermieter angelegt. Ein Minecraft-Server kostet 5,70 € im Monat, also mal 12 € per Paypal an Host Unlimited schicken, dann gleich den Server anlegen.

Hm, klappt nicht. Also Support-Ticket eröffnet. Am nächsten Tag keine Rückmeldung. Na dann rufen wir doch mal an. Nach mehrfachen Versuchen hatte ich dann jemanden an der Strippe, der mich  minutenlang zuhören ließ, wie er sich bemühte, den Server zum Laufen zu kriegen. Letztlich löschte er ihn und legte einen neuen an. Und der lief dann sogar! :-) Der FTP-Zugang funktionierte ebenfalls, aber nicht für lange.

Plötzlich war Ende, “falsche Benutzerdaten”. Also wieder Support-Ticket eröffnet. Dann erst mal nichts, nach zwei Tagen die Antwort: “Ich weiß auch nicht, warum die FTP-Zugänge manchmal nicht mehr gehen, legen Sie einfach einen neuen an.” Das geht in der Benutzeroberfläche sehr einfach.

Nur dass der neu angelegte Zugang ebenfalls nicht funktioniert. Das habe ich ins Support-Ticket geschrieben. Radio Silence. Nach zwei Tagen noch mal nachgefragt. Nichts. Am Telefon erreiche ich auch niemanden mehr. Hier ist der Stand von heute, also nach 7 Tagen ohne FTP-Zugang:


Mit anderen Worten, ein schlechter Witz.

2014/12/01 at 18:07 2 Kommentare

Changing PDF Titles With pdftk

Have you ever noticed that many PDF converters, or scanning programs, create PDF titles that are anything but meaningful? I’m using XSane for scanning, and all the PDF files get this title:

XSane scanned image

That’s totally meaningless. Others create PDF from Microsoft Word, and many of those PDF files have Microsoft Word in the title — in most cases, the title even begins with Microsoft Word, which makes it hard to identify the document you’re looking for in the window bar when you have several of them open.

With pdftk (PDF Toolkit), you can fix this easily. I’ve used it only on Linux, but apparently it’s available for other major platforms, too. Be warned that this is a command-line program.

So here’s what I do to change a PDF title.

Here’s a typical “Microsoft Word” PDF file:

Atlas~/private/stefan> l neugier_handout.pdf
 -rw-r--r-- 1 stefan users 531831 25. Okt 2012  neugier_handout.pdf

1. First step is to dump the PDF metadata to a file which I call report.txt:

Atlas~/private/stefan> pdftk neugier_handout.pdf dump_data output report.txt

Here’s what’s in the PDF metadata:

 Atlas~/private/stefan> cat report.txt
 InfoKey: ModDate
 InfoValue: D:20081229161229+01'00'
 InfoKey: CreationDate
 InfoValue: D:20081229161229+01'00'
 InfoKey: Author
 InfoValue: Charakterstärke
 InfoKey: Title
 InfoValue: Microsoft Word - Neugier_Handout.doc
 InfoKey: Creator
 InfoValue: Word
 InfoKey: Producer
 InfoValue: Mac OS X 10.4.11 Quartz PDFContext
 PdfID0: 911d0c6f06613f3690fa270fad39d33b
 PdfID1: 911d0c6f06613f3690fa270fad39d33b
 NumberOfPages: 4

2. Second step is to edit the metadata file:

 Atlas~/private/stefan> vi report.txt

Here’s what I’ve changed. Note that I’ve used ASCII-7, because pdftk doesn’t seem to be able to properly handle UFT-8 and friends:

Atlas~/private/stefan> grep Neugier report.txt
 InfoValue: Neugier - Staerkentraining

3. Third step is to update the metadata in the PDF file. Note that the output must be written to another file — pdftk refuses to overwrite the original file:

 Atlas~/private/stefan> pdftk neugier_handout.pdf update_info report.txt output neugier_handout.pdf.copy

4. Last step is to make the copied PDF file the original PDF file:

 Atlas~/private/stefan> mv neugier_handout.pdf.copy neugier_handout.pdf

And done. Verify that the title meets your expectations in the PDF viewer of your choice:

 Atlas~/private/stefan> okular neugier_handout.pdf

The steps are easily scriptable if you’re so inclined.

2014/11/26 at 11:00

Firefox Tab Sync Issues

Firefox again. Whenever I have time to waste, I try to configure its features to make working with a browser more productive. Incrementally, I’m getting there — by the year 2100 I should have reached optimum productivity. :-)

When I recently installed openSuse 13.2 on my laptop (fresh installation, except that the /home directory was preserved), and then opened Firefox (33.0) for the first time, it synchronized the tabs from my work computer (a desktop computer). All those tabs were pinned tabs, since I rarely have regular tabs open in the browser. (When I do, it’s mostly for searches, or for ebay which cannot handle pinned tabs well.) Anyway, looks I’ve been lucky with that pristine Firefox from the fresh installation. Normally, there seems to be no way of keeping tabs in sync across devices. Meh.

At least there’s a semi-automatic way of syncing tabs, but it’s well hidden in Firefox. From googling, I found that there must have been an option in the History sidebar (CTRL+H) at some point (2012 or so), labeled something like “tabs from other devices”. That would be nice to have, but apparently they removed it in newer Firefox versions. These days, what you do is open a new tab, then type about:sync-tabs in the address bar. Quite intuitive, I would say. :-)


The prerequisite of seeing something here is that you’ve enabled Firefox Sync on your various devices. If that’s the case, Firefox will list the tabs from your other computers, tablets, or smartphones, grouped by device. Note that it will list only the tabs that aren’t already open on your current device. Also note that Firefox has its own ideas about what “open” is — any pinned tabs on your current machine are disregarded. In other words, if a page is open in a pinned tab, Firefox will still show it in the tabs from other devices list. However, Firefox will show pinned tabs from your other devices, which is kind of inconsistent, but helpful nevertheless.

Now you can double-click on the gray boxes, and they’ll be opened in a new tab. At the same time, they’ll disappear from the list.

Right-clicking on the sync-tabs page lets you refresh the open tabs list. If you mark a gray box with a left-click, then right-click on it, you get an additional option, which is to add it as a bookmark.

So, very limited functionality, and limited use.

I tried grouping tabs, too, but that’s a feature I’d consider not working properly, or at least it has a flawed design. It doesn’t work at all with pinned tabs (they appear in every tab group, no matter what you do), so you’re forced to use regular tabs. Also, tab groups are supposed to close tabs from other groups when you open them, but they don’t behave that way in my browsers (on Linux). And if I dare to manually close those other tabs that were opened from another tab group, guess what happens? The tab group is empty then. Oh boy. That’s usability spelled backwards.

Comments are welcome, but please don’t advice to switch to Chrome. While I do use Chrome when working with add-ons in Google Docs (because add-ons only work in Chrome), I have a pretty good idea how this world would look like if everyone consolidated on Chrome. I bite my tongue not to end this article with a little rant, so let me just say that I deem a properly working Firefox an important thing to have these days. Thanks for reading, and agreeing. :-)

2014/11/21 at 13:26

MediaWiki toolbar missing after DSM update

Meh. Synology updated quite a few built-in components when updating the DSM (basically the “operating system” of the Synology NAS boxes) from DSM 5.0 to DSM 5.1. Look at my previous articles to see what stuff broke, and how I fixed it, or at least how I found a suitable workaround for broken functionality. Let me make it clear that I’m not blaming Synology for the issues I’ve been facing; but having to fix stuff in the aftermath is a nuisance, anyway.

Okay, so here’s the most recent issue I found, and how I fixed it. When editing a page in the MediaWiki on one of my NAS boxes (“zeus”), I found the toolbar was missing. Not a deal-breaker, but an inconvenience.synology-mediawiki-toolbar

In one of the articles I found by googling for “mediawiki toolbar missing” someone suggested to turn on the Firefox web console (formerly: JavaScript console, if I remember correctly), and see if there were any JavaScript errors when editing a page. So I turned it on (CTRL+Shift+K), and indeed, an error showed up (marked in the screenshot below):


Googling for that error message, I found a short article pointing out that the “mw.loader.version” function had been removed in a recent MediaWiki update. Thanks very much for that! :-) Fortunately, the article also had a link to the respective bug, and to the fix, which is here:,unified

Here’s how I applied the fix:

  1. Get on the command line, as root.
  2. In the directory where the MediaWiki is installed (/volume1/web/MediaWiki by default), either grep for “mw.loader.version”, or simply believe me that the file you need to edit is under extensions/WikiEditor/modules. So change directory there.
  3. Make a copy of the file (cp jquery.wikiEditor.js jquery.wikiEditor.js.ORIG).
  4. Edit jquery.wikiEditor.js — I’m using vi for this.
  5. Locate the line that contains the wrong function (in vi, press / and type mw.loader.version, then press Return).
  6. Change mw.loader.version to mw.loader.getVersion.
  7. Save the file, and quit the editor (in vi, this is :wq).
root@zeus:/volume1/web/MediaWiki/extensions/WikiEditor/modules> ls -l jquery.wikiEditor.js*
-rw-r--r--    1 http     http         21440 Nov 19 09:04 jquery.wikiEditor.js
-rw-r--r--    1 root     root         21437 Nov 19 08:40 jquery.wikiEditor.js.ORIG

When done, edit a Wiki page in Firefox. You might have to forcibly reload the page in Edit mode, because Firefox loves to load pages from cache. Now, the JavaScript error should be gone, and the toolbar should be back.

2014/11/19 at 09:21

SyncMe Wireless

I’ve been using Rsync Backup on my Wiko Cink Peax 2 smartphone for half a year. Two days ago, it stopped working. That is, it refused to connect to my Synology NAS (DS 214se), complaining about “no matching algo kex”. There’s a lot of discussion going on about that error on the developer’s website:

Automatic Nightly Backups for Your Android Device to Your Computer | Guysoft’s Weblog

The reason for the error: The latest operating system update on the NAS removed some old SSH ciphers that were insecure. Rsync Backup uses those ciphers. The fix would be to re-add them, so I tried that. The result was that the SSH daemon on the NAS would refuse to start up. Also, fiddling with insecure ciphers isn’t particularly secure. The real fix would be to use secure ciphers for Rsync Backup, but apparently the developer has no plans to do that. So, looking for a replacement.syncmewireless

On the Play Store, I found SyncMe Wireless. Wow, what a nice tool! Its usability is brilliant, kudos to the author!

On startup, it ran me through the process of finding the computer to back up to, by scanning the local network for Windows computers. My Synology NAS are Linux boxes, but they have SMB enabled (Synology calls that Windows File Service, fair enough), so their drives and (shared) folders show up just like Windows drives. SyncMe uses plaintext login (username/password), so I’d recommend to use it only in a safe environment, which is what I had been intending to do, anyway.

After storing the connection information, SyncMe asked to create a sync profile, which in my case is a simple backup profile for the photos. So I did that, selecting the destination folder (on the NAS), and the source folder (DCIM/Camera on the smartphone). I deselected the SyncMe option to overwrite any existing files in the destination folder, so it will copy over only new photos, which is exactly what I want.

After saving the profile, it’s now a matter of three taps to back up my photos: open the app, select the profile, run the profile. Very neat, very quick.

2014/11/14 at 12:44

Synology Network Backup failing with rsync error

On November 10, 2014, I updated my Synology NAS boxes (DS214se) to the latest DSM (DSM 5.1-5004). Next day, I found that the Network Backup jobs scheduled in Task Scheduler were failing (I’m backing up shared folders from one box to another on the LAN). Unfortunately, in the logs that can be viewed under Backup & Replication / Logs, it just says “Information … Backup task started”, followed by “Error … Failed to backup task”, without details what caused the failure. Before the DSM update, Network Backup jobs worked without issues.

Synology support seems to be overwhelmed by tickets; I filed one on Monday, and got a reply on Wednesday that they’ll take 3 to 5 business days to get back to me. (Normally, the turnaround is more like < 1 day.)

So, googling, and then logging on to the source box via SSH. (The source box is the one where the data come from, and where the Network Backup jobs are run from the Task Scheduler.) Inspecting the rsync error log unveils this:

zeus> tail /var/log/rsync.error
 Nov 11 02:00:23 (20726) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]
 Nov 11 02:15:05 (20907) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]
 Nov 11 02:30:05 (21091) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]
 Nov 11 02:45:05 (21272) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]
 Nov 12 02:00:23 (15542) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]
 Nov 12 02:15:05 (15722) [ERROR]: rsync error: rsync service is no running (code 43) at io.c(687) [Receiver=3.0.9]

The dates look right. In the error log, there aren’t any service is no running entries before November 11 (the day after I did the DSM update). Looks like rsyncd (the rsync daemon) isn’t running.

What the error lines don’t tell, and that took quite some more googling to find out, is that this is related to rsyncd on the target machine (the NAS where the backups end up). So I looked at the settings on the target machine, and voilà — the Enable network backup service checkbox wasn’t ticked. Ticking it, and then starting the Network Backup job manually on the source machine yielded success.


I can’t tell if it worked without the checkbox being ticked before the DSM update, or if the DSM update unticked the checkbox. In any case, Network Backup works again now, and I can sleep better again. :-)

2014/11/12 at 09:21 10 Kommentare

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