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Showing posts from September, 2015

How to fix the "cryptswap1 is not ready yet" error on Ubuntu?

I never paid attention to the error message that, every time I started Ubuntu 14.04, was saying that " The disk drive for /dev/mapper/cryptswap1 is not ready yet or not present ". However, this caused that today I couldn't start the system at all, which is a painful and stressful experience. These are the steps I followed to fix the issue and get Ubuntu back to life. 1)  At the GRUB menu , start Ubuntu in recovery mode 2) At the Recovery menu , select " Drop to root shell prompt " 3) Type " sudo swapoff -a " to disable swapping 4) Type " sudo mount -o remount,rw " to have write access to the system files 5) Type " sudo nano -w /etc/crypttab " and put a "#" at the beginning of the line that starts with " cryptswap1 ". Save the file. 6)   Type " sudo nano -w /etc/fstab " and put a " # " at the beginning of the line that starts with " /dev/mapper/cryptswap1 ". Save the

Using Windows and you can't see your Android device on DDMS? This is how to fix it!

I recently bought a new phone running on Android 5.0.2 and, after enabling the Developer Mode and activating USB debugging , I was unable to connect it to Eclipse on Windows 10. The DDMS view and adb devices command showed an empty list. This is how I fixed it: 1) Make sure you the Google USB Driver installed in your Android SDK folder. 2)  Connect your device via USB and open Control Panel -> Device Manager . 3)  You will see under " Other devices " an unrecognized " ADB Interface ". Right-click on it and select " Update Driver Software ". 4)  Click on " Browse my computer " and enter the path to your Google USB Driver ( <sdk>\extras\google\usb_driver\ ). 5)  Click on " Let me pick from a list of device drivers " and select " Android USB Device ". 6) Save changes and restart your IDE. Your device should be now visible from your DDMS view.

How to deploy a PostgreSQL database in Ruby on Rails through Cloud Foundry

If you have a Ruby on Rails app with a PostgreSQL database and you are deploying it for the first time through Cloud Foundry to your hosting provider, you might have realized that a simple cf push yourappname doesn't initialize the database. As it occurs when you are working locally, you  first need to trigger the database creation and migration processes . In my case, I am connecting to IBM Bluemix through Cloud Foundry , and my app is connected to an ElephantSQL  PostgreSQL database. These are the steps to deploy my app successfully: 1) Deploy the app for the first time:  cf push yourappname 2) Create the database and run the migrations (if any):  cf push -c "bundle exec rake db:create db:migrate" yourappname .  Note that this command will leave the app down. 3) Start the app again:  cf push -c "null" yourappname