Category: Development

SSH Key Authentication

If you are working with SSH a lot, it might be useful to generate a keypair, and setup the public key on your remote server, so you can easily login without needing to enter a password every time you connect.

Client config

A keypair consists of 2 files, by default they are located in ~/.ssh and are called:

  • id_rsa (private key, never give this to anyone, and never¬†put in on any public location)
  • (public key, this key is meant to be configured on the server you would like to access)

Step 1. Generating a keypair with ssh-keygen:

If you don’t have a keypair yet, or want to generate a new one for this specific server, you should open terminal and enter: ssh-keygen and press enter.

Note: If you already have a keypair don’t use the default location, or it will replace your current private & public key


Enter the filename in which you would like to save the file, I’m using test for this demo purpose, press enter.

After this you will be prompted to add a passphrase, this is optional.


As you can see my test certificate has been generated.

Server config

In order to be able to connect to hour server without a password next time, we need to get the contents of the public key, and add it to the autorized_keys file on the server.

On your client terminal you can use cat to output the public key contents:

cat ~/.ssh/

Just copy and paste the output

Login to your server as you normally would (with your credentials) and paste the public key into ~/.ssh/authorized_keys if the file doesnt exist it will be created by calling
vim ~/.ssh/authorized_keys
nano ~/.ssh/authorized_keys
whatever you prefer ūüôā

To doublecheck if your server config is setup correctly you can check the config file sshd_config with vim or nano (if you can’t find it use¬†locate sshd_config)
the following lines should be present in the config file:

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

If they are not you can add them at the bottom, and restart your sshd server with the following command:
/etc/init.d/sshd restart



  • If you used a different name for your public and private key (so not the default id_rsa) you will need to add an entry to your ~/.ssh/config so terminal knows which identity file to use for you server.
    an entry would look like:

    IdentityFile ~/.ssh/myidentityfile

    Note that you point to the private keyfile here.
  • If you are having trouble using your keys, make sure your private keyfile is readonly for you (chmod 600 ~/.ssh/id_rsa)

Using version control in your development workflow

I think every developer should use some form of version control (svn, mercurial or git).
I use git for all of my projects and have used mercurial / svn in the past, it saves me a lot of headaches in the projects in the long run.

There are great ways to use git for bigger projects, like the git branching workflow:


But for the smaller projects this is too complicated.
For the smaller projets I would recommend just using a development branch and a release branch.

checkout the release branch on the client’s webserver (first make sure your client isn’t hosted on a shared hosting service..)
checkout the development branch on your development server, make all the necessary changes, and have the client check the changes on the development server.
If all is well merge the development branch into the release branch, and pull the changes on the release server, and your done.

If any problems arise you can check the commits for any errors, and revert them or add necessary updates and merge them again.
I always keep a wiki page on github as well for all my projects, this is always usefull if a customer calls you 6 months later.

Magento isSaleable() false

If you are having problems with products not being saleable in magento, make sure you add the price attribute to the select, otherwise it will always return false!

$collection = Mage::getModel('catalog/product')->getCollection();



Pushover push notifications for opencart

Get opencart push notifications on your phone!

This App uses the pushover app to send push messages to your Android or IOS device if a new order is received, or a customer is created.

To receive notifications you will need to purchase the Pushover App for Android ( or iOS (

Then download and install the opencart extension: