Tag Archives: Automation

If you have not used Swarm, skim the non-service-discovery tutorial to get a feel for how it works:
https://blog.vpetkov.net/2015/12/07/docker-swarm-tutorial-and-examples. It’s very easy, and it should give you an idea of how it works within a couple of minutes.

Using Swarm with pre-generated static tokens is useful, but there are many benefits to using a service discovery backend. For example, you can utilize network overlays and have common “bridges” that span multiple hosts (https://docs.docker.com/engine/userguide/networking/get-started-overlay/). It also provides service registration and discovery for the Docker containers launched into the Swarm. Now lets get into how to use it with service discovery – which is what you would use in a scaled out environment/production.

Again, assuming you have a bunch of servers running docker:
vm01 (, vm02 (, vm03 (, vm04 (

Normally, you can do “docker ps” on each host for example:
ssh vm01 ‘docker ps’
ssh vm04 ‘docker ps’

If you enable the API for remote bind on each host you can manage them from a central place:
docker -H tcp://vm01:2375 ps
docker -H tcp://vm04:2375 ps
(note: port is optional for default)

But if you want to use all of these docker engines as a cluster, you need Swarm.
Here we will go one step further and use a common service discovery backend (Consul).

Docker Swarm Tutorial with Consul and How-To/Examples

Continue Reading →Docker Swarm Tutorial with Consul (Service Discovery) and Examples

[ updated 10-30-2016 | Upgraded Plex to plexmediaserver- and CentOS ]

Recently I tried setting up a Plex server in a docker container. The first problem was the bind which required logging in locally or port forwarding. After doing this once, I realized that you could use the Preferences.xml file, but that meant that you couldn’t truly automate this/deploy it elegantly in a docker container. And what if you wanted to run other servers — for friends? I finally figured out how to do this in the most elegant way possible.

First – Grab your Unique Plex Access Token

Login at https://app.plex.tv/web/app with your username and password
Open your javascript console (in Chrome: View -> Developer -> JavaScript Console)
and type:

Note the token, which will look like this: “PZwoXix8vxhQJyrdqAbY”

At this stage DO NOT click log out of your account until you register the new server. Otherwise your token will regenerate.
Once you register the server, it won’t matter after that if the token changes.

Grab my Docker Image

Check out: https://hub.docker.com/r/ventz/plex/
You can pull it down by doing:

Continue Reading →Plex server on a VPS Docker setup without port forwarding

A bit of background and the “old/normal way”

If you use Docker, you very quickly run into a common question: how do you make Docker work across multiple hosts, datacenters, and different clouds. One of the simplest solutions is Docker Swarm. Docker summarizes it best as “a native clustering for Docker…[which] allows you create and access to a pool of Docker hosts using the full suite of Docker tools.”

One of the biggest benefits to using Docker Swarm is that it provides the standard Docker API, which means that all of the existing Docker management tools (and 3rd party products) just work out of the box as they do with a single host. The only difference is that they now scale transparently over multiple hosts.

After reading up on it HERE and HERE, it was evident that this is a pretty simple service, but it wasn’t 100% clear what went where. After searching around the web, I realized that almost all of the tutorials and examples on Docker Swarm involved either docker-machine or very convoluted examples which did not explain what was happening on which component. With that said, here is a very simple Docker Swarm Tutorial with some practical examples.

Assuming you have a bunch of servers running docker:
vm01 (, vm02 (, vm03 (, vm04 (

Continue Reading →Docker Swarm Tutorial and Examples

[updated: March 29th, 2015 | Aman Surana created a great youtube video on how to do this. The main difference is that he is using a plugin (comes as an app which extends Tasker) called AutoNotification. The biggest benefit is that it abstracts the application notification layer into a standard set of variables. This allows you to utilize apps other than the main SMS app (ex: now you can use things like WhatsApp, Google Hangouts, etc). It also works with the latest version of Android, which I am starting to get the feeling that my profiles bellow do NOT work with anymore. Anyway, you can find the video here: https://www.youtube.com/watch?t=37&v=c-Kp9KynlV4, and read the post here since the idea behind how to do this still holds. That and it’s an interesting way to accomplish this task – no pun ;)]

I walk outside listening to Pandora quite a lot, and today I realized that I miss about half the SMS’ that I get. Either because it’s too noisy, or maybe because the SMS’ are not loud enough and I use a single beep, or because the sound trigger gets interrupted by Pandora, but either way, it’s a bit annoying. I have been considering some sort of a solution that will play incoming SMS messages when my headphones are plugged in for quite some time, but I couldn’t think of an efficient way to do it — that is, efficient on the battery. I think I came up with one today.

The idea behind this Tasker program is the following:

There are two Profiles: ‘Detect Headphones‘ and ‘Play Text Over Headphones‘. Only one Profile has to be actually active at all times – the Detect Headphones one. When you plug in your headset (with microphone, or just regular headphones), the profile sets a variable %HEADPHONES to ‘yes’. It then turns on the second Profile – the one that monitors incoming SMS messages and plays them over the headset if your %HEADPHONES variable is set to ‘yes’.

Continue Reading →Speak SMS over the Head Phones only when they are plugged in

The general idea behind this is that it utilizes my original Blackberry Sound Profiles for Android and it adds a “timer” element which can be set. Upon setting the timer, it will set a temporary task until the timer runs out. The idea came from one of my visitors who asked me how to do this. At first, I had no idea how to do it. About 30 minutes later I had a semi-working prototype. Another 3 hours later (had to figure out how Scenes worked and interacted with variables and the rest of the system) I had the final version with a working GUI.

The first thing that you need are my Tasker Blackberry Sound Profiles found here: (http://blog.vpetkov.net/2011/05/10/my-tasker-program-blackberry-sound-profiles-for-android). If you don’t have them yet, follow the super quick “Getting Started” section. Once you have the tasks and you have them working (if you want this to work out of the box, grab at least the “Work” task and the “Sleep” task), download the Timed extension:

Note: You need the current BETA to import this profile: http://tasker.dinglisch.net/beta.html (1.2.1b4m)

(md5: 5709a9ed0b139a027900d9f8f1e2e92a)

Now unzip it and follow the same steps from the original post – grab the “Timed.tsk.xml” file and import it into the the Tasks tab, and then grab the “TimedScene.scn.xml” file and import it into the Scenes tab. Go to your home screen and create a Tasker widget of your “Timed” task. Every time you select this task, it will pop a box which will let you use a slider or directly type in a number. After this, when you hit “Set Profile”, the temporary task (by default “Sleep”) will get activated for the number of minutes you set. After that time period it will go back to the other (by default “Work”) task.

Continue Reading →Timed Blackberry Sound Profiles for Android

This is an update to the article “My Tasker  program – BlackBerry Sound Profiles for Android” (http://blog.vpetkov.net/2011/05/10/my-tasker-program-blackberry-sound-profiles-for-android). Download the new file here, read through “what has changed”, and “what I have updated”, and then definitely read the original post (url above) as it contains all the details and how-to information.


What Has Changed:

There are a couple of things that Google has drastically changed in ICS 4.0 when it comes to Sound, Vibrate, and Volume.

First of all, they have greatly simplified the Sound Settings. The Volume menu now contains: “Music,Video, Games, and other media” as one volume toggle, then “Ringtone and notifications” as another, and Alarms as a third. Something to note here is that the keyboard “clicking” sound can now be found under the keyboard settings -> under Advanced.

The Second change is the way “Vibrate” has been re-implemented. The new “Silent Mode” controls three things currently: Sound, Mute, and Vibrate. This is important as this was completely broken on 2.3. The next thing to note is the “Vibrate and Ring” option, as this has a negative effect when toggled on via Vibrate (it’s still sticky for some reason, but due to Silent Mode being fixed, we can now un-toggle it via Tasker).

Continue Reading →Tasker – ICS (Android 4.0) – BlackBerry Sound Profiles

UPDATE: Please check out latest version from my git repo: http://git.vpetkov.net/projects – project name: “pandora”

It seems that Pandora is not putting too much time or thought into how they provide and access music online through their website. I really hope they fix this since it’s irresponsible as far as the the DMCA is concerned. Each song is simply an encoded token, and it’s pulled down directly from, presumably, one of their proxy server. If you look at the stream while playing songs on pandora.com, you will notice something like this (ex: not real):

Some assumptions: the “version=4” is high quality or what used to be CD quality (192 kbps). The “lid=#####” is the “login id”, or your unique user number. The “token=…” is the actual song, encoded. By finding the host of these requests, and putting it all together, where the lid is completely optional, you will have a full request URL to a song.

Imagine putting it together like this: (example as a POC, like this)

Then having something that parses this “buffer”:

One way for them to fix this would be to session encode the requests. You should not be able to make requests that originate from outside of pandora.com directly to the servers. Also, the requests should be authenticated. As an addition, they could potentially be checked against what is “played” and controlled for streaming mechanisms. I really hope this fix this as soon as possible.

[updated: Dec 20th, 2012 | Updated script to deal with new URL and pulling short descriptions now]

UPDATE: Please check out latest version from my git repo: http://git.vpetkov.net/projects – project name: “wordpress”

UPDATE2: Forgot to mention – a MUCH nicer fork of this + many improvements by Droidzone: http://blog.droidzone.in/2013/03/31/automatically-update-all-wordpress-plugins-from-bash/

Please take a look at his version!

I already created a script to upgrade wordpress installations automatically. You can find it here: http://blog.vpetkov.net/2011/06/01/script-to-upgrade-wordpress-to-the-latest-version-fully-automatically Recently, the same general problem came about when it came to plugins. The biggest problem I had is that I had to log-into wordpress, see a number of plugins that were outdated, and then go hunt each one down by generally just copying the name and pasting it into google . Even thought most of the time, the plugin was the first hit, I then had to download the latest version, extract it, and clean it up. Imagine doing this for 10+ plugins for 5+ blogs — constantly. It was just time consuming and frustrating.

Here is my solution in the form of a perl script:

This script can be used in one of two ways:

1.) You can simply run it, and it will update everything that you have listed in the @plugins array.

2.) You can give it a parameter of a registered plugin name. This does 2 jobs — upgrades an existing plugin, AND installs new ones.

You can definitely add an extension to this. For #1, you can go a step further by making it scan your plugin directory and populating the list from there. If you want to be even fancier, you can relatively easily keep version tracks of what you have installed and what’s currently available, so that you don’t just blindly download new plugins. For me this is sufficient. If anyone is interested in getting help implementing any of these extra additions, feel free to ask and I’ll help as much as I can.

UPDATE: Please check out latest version from my git repo: http://git.vpetkov.net/projects – project name: “wordpress”

When you host a WordPress installation for yourself, and there is some sort of an update about every month, it can get annoying doing all the upgrade steps manually (for the people who do not have a CPANEL or FTP account). Now imagine  hosting 5-6 WordPress installations. Now imagine 500+. Welcome to my nightmare. Eventually I caved in and wrote this:

So, to summarize, this will download the latest version of wordpress, unzip it, and move the new things accordingly. At the end, it will remind you to upgrade your DB, just in case. I highly suggest backing up your primary blog before you begin this, just because it’s the “safe thing” to do.

If you just started reading this directly and didn’t read my “what is Tasker”, please read my short post: (http://blog.vpetkov.net/2011/05/10/androids-best-app-tasker-visual-programming-and-automation/)

If you are running ICS 4.0, please read: (http://blog.vpetkov.net/2011/12/27/tasker-ics-android-4-0-blackberry-sound-profiles)

Don’t let the length of this post scare you — I just wanted to provide the technical/developer details. You can get this to work in less than a couple of minutes by downloading the zip file and ONLY reading the “GETTING STARTED” section.



0.) Please download the zip file bellow if you haven’t done so already – Blackberry_Sound_Profiles_for_Android.zip

1.) First, if you haven’t already, install Tasker (you can use the Android Market, or the guys’ website). You can play with it for 7 days for free.
2.) It will create a “Tasker” folder on your SD card. Under that you will find “tasks” and “profiles” folders (if they don’t exist yet, create them).
3.) Download the zip to your computer, mount your phone’s SD card and go into the main “Tasker” folder under the sdcard. If the file ends in .prf, put it in the “profiles” folder. If it ends in “.tsk”, place it in the “tasks” folder. Unmount, disconnect your phone.
4.) Now that you have them, you need to load what you want/need into the program. Open up Tasker (program), hit Menu, and go to “Profile Data”. Do a “Import One Profile” or “Import One Task” select one of the “tabs” (Profiles, Tasks, Scenes), and hold it — an “Import” option will present itself, which will let you import a Profile or Task (or not relevant here – a Scene). This is because Tasker changed the way profiles and tasks (and Scenes) are imported . As soon as you select that, you will see all the files in the directory that you copied. Now you can import whatever you want.

You should import the “Volume Buttons” Profiles (note: this is a profile), at least the “Normal” and “Sleep” tasks (note: these are tasks). The volume buttons profile is honestly a life saver since any time you tap a volume button, it will actually restore to the sound-profile task you have selected.

Now to use them,

5.) Hold down on the home screen, select Widget (for ICS 4, Widgets are created by going to Applications, and shifting over to widgets), select Task. It will show you a list of your tasks. Select “Normal” for example. It will show it to you (in case you have to make any changes last minute — don’t do it this way, always make them in editor), now select the green check and you are Done! You can now use it as a “program” on your home screen. Add at least 2 this way, and select them. Wait 1-2 seconds. You will see how it select/enables each, and then after it enables it, hit the volume keys on purpose, and then wait 1-2 seconds again to see how it restores it.

END OF GETTING STARTED – THAT’S IT! You have it working!



Ahh, you’ve continued reading and you haven’t skipped this…Clearly you care about some of the theory…

One of the biggest problems with Android is the sound profiles. I will start off with the main sound profile BUG:

Try setting your Settings -> Sound -> Vibrate to “Only when in Silent”, and then hold the power key, change the “Silent mode” to ON. Now hold the power key again, and change the “Silent mode” to OFF. Check your Settings -> Sounds -> Vibrate mode — it is changed incorrectly to “Always”. This renders the built-in “sound profiles” completely useless.

Here are bug reports that are all for the same thing: Issue 20463 and Issue 13732

UPDATE: Please note that Google “sort of” fixed this, to a point, where we can now correctly implement the functionality using Tasker at least. It’s not there by default, but the “Silent Mode” now works for on (sleep), off, and vibrate, and there’s a separate toggle-able Ring+Vibrate feature.

Pretty much, half of these are the same issue. The main problem is that the Silent and Vibrate options for android, are really one single “Silent Mode”. The problem arises because Sound -> Vibrate settings only apply for “Silent Mode”. This means that you cannot have a completely silent profile and a vibrate only profile, and a “normal” profile. This is the most evident to anyone coming from a blackberry, where the sound profiles are flawless. I’ve read thousands and thousands of questions asking “how do I get sound profiles like on the blackberry”. Personally, this was the first thing that drove me crazy when I moved away from the blackberry.

Most people default to using a program which creates “Profiles” — setting bundles which simply toggle each Sound option (In-Call volume, Media, Ring Tone, Notification, Alarm, and System). The best one I’ve seen is AudioGuru, which is great, but it does lack some customization. The one additional step that most programs lack also is some sort of a guard for the volume buttons which toggle the ringtone.

My goal when thinking about all of this was to create a solution that was simple, extendable, and complete. The main points I was going after was to have profiles that are completely stand-alone, extendable/fully customizable, and completely scriptable. The end result was what I call “Blackberry Sound Profiles for Android”.


First off, here’s the download:

(md5: 71d0701ce63a6953a997145c758753c8)

(don’t forget to go to Settings -> Sound -> and UNCHECK “Use incoming call volume for notifications”. Also, Settings -> Language & keyboard -> Android keyboard -> and CHECK “Sound on keypress”)

The logic becomes part of 3 sections. The FIRST SECTION is the Tasker sound profile tasks. These are “stand alone” tasks, which simply encompass every aspect of a sound profile. Let me walk through one of them:


0.) Set a default icon (used grey star in this case)
1.) Wait – 2 seconds
[note – for ICS 4, there is an extra step in here turning off the Ring+Vibrate fixed feature]
2.) Silent  Mode – off
3.) In-Call Volume – 5
4.) Media Volume – 9
5.) Ringer Volume – 5
6.) Notification Volume – 5
7.) System Volume – 6
8.) Alarm Volume – 7
9.) Set Widget Icon (to %PROFILE – used default grey star)
10.) Variable Set (%PROFILE to “Normal”)
11.) Set Widget Icon (to %PROFILE – used the grey sound icon)
12.) Notify – %PROFILE
13.) Wait – 1 second
14.) Notify Cancel – %PROFILE

Let me clarify some key things:
step #9 is needed in order to clear the old Icon back to a star.
step #10 sets the global variable to the name of this profile
step #11 activates the pressed/toggled widget

I’ve also included a “Sleep” sound-profile task (toggles all down except alarm and media), a “Work” sound-profile task (same as “Normal” sound-profile task, but the notification is less and the system sound is less so the keyboard is not obnoxious), a “Loud” sound-profile task (makes everything as loud as possible basically), a “Vibrate” sound-profile task (like sleep, but has vibrate on), and a “On-Call” sound-profile task (like sleep, but ring tone is low).

I am not sure if you are already picking up what’s going on, but basically, the idea is that you have a few of these sound-profile tasks, and you create widgets on the home screen. They all show up as grey stars. When you press “Normal” or “Sleep” for example, it changes the star to the correct icon (Sound Icon, or Muted Icon), and shows it on your home screen and notify’s in your notification bar (after which, a second later, it clears the notification bar). Now, go through the other profiles to see what they do. They are all pretty much the same, except the Vibrate profile, which uses step #2 to select the official Android “Silent” mode, with a Vibrate outlet.

Now, the SECOND SECTION is a single Tasker task called “Sound Profile” which has one step:

1.) Perform Task – %PROFILE

And now you see why step #10 from section one is needed. When this task is called, it will change the current Sound profile to the global variable (%PROFILE). Please import this task too. Why is this needed you ask? Because of my clever hack in the THIRD SECTION:

Here is where you have a Tasker Profile. It is called “Volume Buttons”. The basic logic is as follows:

1.) If Variable Set %VOLR (ringer volume), then call the “Sound Profile”

This essentially achieves a volume-reset every time you accidentally hit the volume up or down keys. Now you can see why the “Wait – 2 seconds” was needed. The key part about this is that it uses your global variable, and it resets your volume to the last Sound profile that you selected. Great huh? Please make sure you import the “Volume Buttons” profile into Tasker.

At last you are Done! You now have individual Tasker tasks which you can make widgets out of. I have the 3 that I use the most – Normal, Silent, and Work (work being a bit quieter on the notification and system sound for the keyboard noise) on my main home screen. Then I have the Loud, Vibrate, and On-Call on another screen since I use them less often.


For the people interested, the ‘On-Call’ task works in a super elegant way: it silences everything except the ring tone (which it lowers), the alarm, and the media volume. The media volume is the key here. Let’s say you want SMS notifications but not emails while you are on-call. They both use the “notification” system, so there’s no way to do this by default (yet another ex-blackbery annoyance). What you can do is write a Tasker profile which interprets a “Notification Messaging, *” notify, (you can check the time if you are only on-call during the night or day) and then have the action for the task for the profile call the “Music Play” action which simply plays your SMS sound as an MP3. This essentially lets you isolate one application from another, by using the fact that you can play the selected notification through the media outlet. Beautiful Eh?

I hope all of this helps people out.

UPDATE – Added “One Ring” Task and Profile Monitor

I’ve updated the zip pack with two additions: a task which will provide you with a “One-Ring” sound-profile task — it’s basically the normal profile, but it brings the Ringer Volume to 0, and it increases the Media Volume up to 11. Also, I’ve added a “One_Ring_Monitor” profile, which intercepts calls, and plays a music file (mp3, wav, ogg, others…) — giving you the ability to play a notification — thus a single beep/sound.