29 Apr

Owncloud 9.0.1 on Raspberry Pi 3 – Step by Step

Why?!

I bought a Raspberry Pi 3 on the day it was announced, because I am easily excitable. When it arrived, I tried out a few things like compiling Synergy (much faster than a RPI2!) and the oblig. Quake 3. Once the fun wore off, I thought this might be a good time to finally sort out my cloud storage issues. The issues are as follows:

1) I am mildly concerned about having my data live on someone else’s computer
2) I really like and rely on Dropbox, but my 8GB isn’t enough anymore
3) I am a cheapskate

The solution for this is to self-host a ‘cloud’ storage system. While that’s a bit of a paradox, having a system (with apps!) that can have my files on me wherever I go and upload pictures I take on my phone automatically is too handy to give up – and too risky to have no real control over. The best open-source (free, see point 3 above) solution I’ve found so far is OwnCloud.

Note: If you want to do an OwnCloud install following this post – it doesn’t need to be on a Raspberry Pi 3 – you can do it on pretty much any Debian/Ubuntu server. One day I will move this whole thing to a proper server, but again, see point 3.

Note 2: There are hundreds/thousands/millions of ways to do this task. I am basing this whole thing on Dave Young’s very well written howto on Element14. In fact, you can probably follow that right now and skip my post – I am writing this down for my own benefit and there are a *few* changes in OwnCloud 9.0.1

What?
OK, so what do you need to get this up and running?

  1. A Raspberry Pi 3 Model B – buy one here 
  2. A MicroSD card (Class 10 is speedy, you can get a 200GB one for $80USD at the moment, which is NUTS).
  3. The .img file for Raspbian OS. I suggest using Raspbian Jesse Lite
  4. An internet connection. Any one will do, but a decent 30/10Mbit/s is probably recommended.
  5. A static IP and a domain name (or a dynamic DNS service such as the one offered at system-ns.net)
  6. A keyboard and an HDMI capable monitor or screen. This is just for setting up the Pi
  7. Some basic Unix shell skills.. Although you can just follow along and hopefully I’ll spell everything out
  8. A router/firewall in your house that you can forward ports on

Optional extras:

  1. An external USB HDD (for more space)
  2. A smartphone, for the OwnCloud App

If you have the 8 things above (we’ll cover step 4 in some detail later) – then we’re good to start.

Steps to success

Section 1 – Setting up the Raspberry Pi 3

This section you can skip if you already have a freshly installed Raspberry Pi 3 running Raspbian.

  1. First up, install Raspbian OS on the SD card. Steps to do this for your main PC OS are here.
  2. When you have booted into your newly installed Pi, log in with username pi and password raspberry. You’ll change this soon. I suggest you do this bit with the Pi plugged into a TV or screen, with a keyboard. We’ll SSH in and control the Pi from another machine later on.
  3. Run the raspi-config tool – you can set your hostname, expand the file system (use all of your SD card, not just a couple of GB)


    rpi-confIn there, I suggest you run Option 1 and 2. Inside Option 9, I set the Memory Split to 4MB (this is mostly a headless install, why waste RAM on a GPU that won’t get much use), and enable SSH. I changed the hostname to ‘cloud’, pick a name you like. Finish up, then reboot the Pi

  4. Find your IP address. I am using the Ethernet interface (physically plugged into a switch), but you could use WiFi if you wanted (Raspberry Pi 3 has in-built WiFi, google will show you how to set it up!)


    Here is a command to show the IP DHCP has given you (Raspbian uses DHCP by default). I could set this manually by editing /etc/network/interfaces and changing eth0 inet DHCP to inet static, but I won’t be doing that. I’ll be assigning a static DHCP lease in my router config to keep my Pi on 192.168.0.13 for good. ANYWAY – my IP is found, so I can SSH in from my main computer and live an easier life.
  5. Log in to your Pi from a terminal. iTerm2 for OSX, Putty for Windows, uhh, Terminal from *nix. I use password-less entry as a security feature and because I’m lazy – if you want a hand setting that up let me know – otherwise, you’re in and can run the following commands:

  6. That chunky block will install some key pieces of software for us
    1. NGINX – the web server we’ll be using
    2. PHP5 – PHP, bane of all existence
    3. Lots of PHP bits and pieces, PHP5-apuc is the memory cache we’ll use, for example
    4. git – to allow us to grab a nice SSL certificate from Let’s Encrypt

Section 2 – Configuring and installing other bits

  1. Let’s get an SSL cert, so browsing to our Cloud will show a nice green lock in browser, and the OwnCloud app won’t complain *too much*. Of course, this also helps to keep the contents of the cloud machine nice and secure. I use Let’s Encrypt for free signed certificates – something you couldn’t even dream of 5 years ago. As there isn’t a packaged Let’s Encrypt installer for ARM7 Debian at the moment, we’ll use git to grab one:


    This will grab Let’s Encrypt (the software) and chuck it in a folder in the pi user’s home directory called letsencrypt, then move us in there. It took about 10 minutes on my Pi 3 and reasonable internet connection, your results may vary.

    When that’s installed, we need to break out and get a DNS name (and a dynamic one, at that, as my ISP doesn’t offer static IP addressing)…

  2. Head to System NS, sign up and create a Dynamic DNS name. For the rest of this bit, I’ll refer to my domain as cloudy.system-ns.net. Next thing we need to do is automate the IP<>DNS mapping, as my ISP might pull the rug out and change my allocated IPv4 address at any time. System NS has a guide to do this for your OS (makes sense to do it on the Raspberry Pi, though!) – which can be found here.Basically, you create a file on the Raspberry Pi which tells the Pi to download the System NS page responsible for tying your current public IP to the chosen DNS name. Then you schedule it with crontab to run every 5 minutes. This means in the worst case, you will be a DNS orphan for around 5 minutes (System NS TTL for A records seems to be very short, which helps).
  3. OK – so now we have a domain, let’s get back to sorting out a SSL cert for it. As this Raspberry Pi will be used solely for OwnCloud (as far as the webserver side of things goes) I will generate the certificate for the /var/www/owncloud directory:

    This will go away and pull a cert down from Let’s Encrypt. In fact, it will pull down a public certificate and a private key. They will be (by default) lurking in /etc/letsencrypt/live/cloudy.system-ns.net (you need to be root to look in there, which you can do with ‘sudo su’. Type ‘exit’ to get back to the pi user when you’re done gawking at the nice new certs.

  4. So, that’s some housekeeping done. Next, I’ll steal wholesale from Dave, and give a modified version of his NGINX config (remember, that’s the web server we installed back in section 1).Let’s edit the nginx config file! (Actually, let’s delete everything in it and start again)!

    This will open nano, the wusses text editor. I love it, because I can remember how to use it in a hurry. Anyway, delete everything in there (ctrl-k deletes a whole line at a time in nano).  Then edit this, and throw it in:

    You can copy mine and replace all the bits with cloudy, 192.168.0.13 etc..

  5. Now we can change the PHP settings to allow for larger uploads of files. Dave suggests 2GB, so we’ll go with that. In practice you can set it so whatever your filesystem allows. I’ll combo in a couple of steps here (changing where php-fqm listens as well)

    I didn’t follow all of these exactly, so I’ll copy-pasta Dave’s advice and leave you to try it out.

  6. Reboot the Pi!

  7. Now you need to install OwnCloud (hey, finally!). The way to do it on a Raspberry Pi 3 running Raspbian is simple.
    1. Grab the tarball from here

    2. Extract the files

    3. Now you end up with a nice folder called ‘owncloud’. We want to stick that where NGINX is looking for websites, so we’ll move it to /var/www, change the ownership of the folder to belong to the www-data user and delete all the evidence.

    4. Dave now recommends you edit a couple of files in the /var/www/owncloud folder to tweak the filesizes:

    5. Do a final ‘sudo reboot’
    6. Browse to your 192.168.0.13 (whatever you called it) and set up OwnCloud. I have mine set to use the SD card for storage, if you wish to use an external HDD, consult Dave’s excellent post.
  8. When you first load OwnCloud it might complain about a few things, they can usually be solved by installing a memcache, tightening up file/folder permissions or tweaking other security features. As you have a valid SSL cert, you can probably get going pretty well straight away. I’ve added the necessary tweaks to the NGINX config that should get you past most of the pains, at least under Owncloud 9.0.1.
  9. That should be it! I lied, above, though. I use both the SD card and a backup onto an external HDD. This gives me the ability to live without my external HDD if I need it for anything temporarily, and keep 2 copies locally of all my stuff. To do it, I use a nice program called rsync and a little script + crontab to schedule it to run. rsync has a million uses, but one is copying files from one place to another in a really smart way, using deltas (i.e. it only copies the files that have changed). This way, I can schedule it to run every 6 hours, and it only takes as long as transfering the new or changed files to run.
    1. Install rsync!

    2. Create a script to run the sync..

    3. Now every 6 hours from midnight that will run, doing an rsync and adding a date-stamped line to the file oc-backup.log. My 1TB external drive is permanently mounted to /media/shamu, by the way.

So, that’s it. Up and running. Mine has been working for 2 weeks now, approx 128MB of RAM free during normal operation (I check a little too often). php-fqm eats the CPU for breakfast when doing things like generating image previews in the app (I use the Android one and it’s great).. But mostly it all works. In fact, today I deleted my Dropbox app and all the files on it – I’m eating my own dogfood here, trusting this setup for better or worse. If you use it, let me know!

27 Apr

How to migrate a Raspberry Pi SD card to a bigger SD Card

Snazzy title, James.

I recently bought a 200GB SD card from Amazon for what I consider to be a completely crazy price (around $80USD). My Raspberry Pi 3 is running OwnCloud (howto post coming soon) and the 32GB card currently serving as the OS’ home is a little on the small side. It’s also quite an old card, so I’m worried it will one day up and die.

Here’s a quick step-by-step on how to move your SD card to a bigger one, using a Mac with OSX El Capitan (or basically any Unix based computer with an SD card reader).

Step 0: Backup anything important. Things can go wrong any time you mess with this stuff, so caution.

Step 1: Shutdown your Pi (pull the plug out)

Step 2: Take the SD card you want to copy out of the pi, and stick it in your Mac (with an adaptor). It will mount automatically, so run Disk Utility and unmount the ‘boot’ partition, which is what Raspbian OS calls it by default. Once the partitions are greyed out, they’re not mounted anymore.

Screen Shot 2016-04-26 at 2.28.51 pm

Step 3: Check you have space. You will need as much free hard-drive space on your Mac as equals the size of the SD card, even if it’s not full. Mine is 32GB, so I need 32GB hard drive space free. Sadly, I don’t have that much free on my tiny SSD, so I will be using an external USB 3 drive with ample space.

Step 4: Find the BSD name of your SD card reader/card. You do this by opening a terminal and entering:

Yeah which will spit out a list of your connected media. We’re looking for something that matches the 32GB size of the SD Card (yours might be 8GB, 16GB… whatever)

Here we see ‘disk2’ under Identifier, which is what we want.

Step 5: Find out where the file copy of the SD card should go. I want to stick it on my external HDD called SUGAR ROSS (for some reason), so I need to find where it’s mounted.

There I show you that the 1TB external drive I have connected is located at /Volumes/Sugar\ Ross/ . The extra \ I have in there is an escape character, which helps Unix based Operating Systems handle things like spaces in folder names, which it didn’t historically like.

Step 6: Copy that floppy. We’re now going to use one of the oldest Unix commands there is – dd. Once again, in the terminal, tell the computer to make a direct byte-for-byte copy of the SD card and stick it in a file called sdcard.img (or whatever you fancy).

This will take a long while. It’s pretty oldschool and takes its job very seriously. You can tell what’s going on behind the scenes by pressing control-t every now and then. So far, mine has written 23GB in 1226 seconds, and still running. Won’t be much longer now, have a cup of tea. (I will not be doing this for my 200GB card.. Hopefully).

Step 7: Check your image. Ok, 27 minutes elapsed time later, and dd tells me it has finished. As I never believe anything my computer tells me, I want to check the output file.

Using ‘ls -la’ shows me all the files on SUGAR ROSS, and I can see my nice .img file there at just shy of 32GB.

Step 8: Format wars. The SD card I am replacing my Pi’s with is 200GB, and I’m told that gargantuan SD cards have a funny filesystem that’s not compatible with the Pi. As I am writing a physical copy of the existing card onto the new one, I don’t think I’ll have a problem. If you do, I suggest formatting it to FAT32 and going from there. The dd process (this time in reverse) we just ran will take care of everything, as we didn’t copy a partition of the SD card, we copied the whole thing.

Step 9: Prepare the new card. Stick the new (bigger) SD Card into the Mac’s card reader. Use diskutil list again to find the BSD name of the disk, and then unmount any partitions that automatically mounted.

Step 10: Write to disk. This time, we use dd in reverse (and wait a lot longer).

Hint: make sure you unmount, not eject the SD card partition on the card you want to write out to. Disk Utility is good for this.

Step 11: Fire it up. Now that we’ve spent 11,000 seconds writing the 32GB image back to the new card, unmount it (if you succeed with dd in step 10, it should auto mount on OSX). Place the new card into the Pi and power it up. With any luck, it will fire up as it did before. Note, you’ll still only see the original filesize, for now..

(See how it still says 29G? That’s a good indication my old SD card (and all the partitions on it) were copied over to the 200G card.

Step 12: Expand the filesystem. Run the following command to stretch out the filesystem to the full 200G.

You can then select ‘Expand filesystem’ from the menu and reboot..

Step 13: Revel in your success.

Here we see 181GiB of usable space (roughly 200GB). Hooray!