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Install Rails in Production

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Installing rbenv

3:58 with Jay McGavren

We're going to use a program called `rbenv` (short for "RuBy ENVironment") to install and manage our Ruby interpreter on this system. Let's install `rbenv` now.

Run these commands while logged in as the deployment user on your server:

$ git clone https://github.com/rbenv/rbenv.git ~/.rbenv (No need for sudo)
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
$ ~/.rbenv/bin/rbenv init
$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

Then log out of your server and back in to load the changes to your $PATH environment variable.

You can confirm the installation was successful by running rbenv:

$ rbenv

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    In case we wind up needing multiple Ruby versions on this server, 0:00
    we're going to use a software package called rbemv. 0:03
    That stands for Ruby environment. 0:07
    Rbemv will download and install Ruby versions for us and 0:11
    let us switch between them as needed. 0:14
    Note that it shouldn't be confused with RVM standing for Ruby Version Manager. 0:17
    RVM is a bit more complex than rbenv, and while it's appropriate for 0:22
    a development environment. 0:26
    It's probably better to use rbenv in production. 0:27
    So let's click on RVM's GitHub site here. 0:33
    And then go down to the installation section. 0:38
    And you'll see the command for installing it here, basically you just git clone 0:41
    the repository into your home directory on your server. 0:46
    So we're gonna copy that command and then go back to our terminal and 0:49
    paste it there. 0:52
    Next, we need to add rbenv to the list of paths that Linux searches when it's 0:58
    looking for executables. 1:02
    So I'm gonna copy the second command here, and again paste it into my terminal. 1:04
    And what this does is it'll just cause your system to search the rbenv 1:10
    directory for executables before it searches the rest of the directories. 1:15
    Next, the install instructions advise us to run this command, 1:23
    to get instructions on how to set up the rest of our environments. 1:27
    We'll copy this, piece it into the terminal. 1:30
    And it says to add this line here to our bash profile configuration file. 1:34
    So I'm going to fire up the nano editor. 1:41
    And edit the bash profile file. 1:46
    Note that that starts with a dot here in our home directory. 1:50
    And I'm going to paste that line here on a new line. 1:55
    As usual I'll hit Ctrl+O to write out the file and Ctrl+X to exit. 2:02
    Now, to load in these configuration changes, 2:07
    I'm gonna need to restart the shell. 2:09
    So I'm going to exit out of the system and log in again. 2:11
    We can confirm the installation was successful by running the rbenv command. 2:18
    The last recommendation here in the rbenv install instructions is, 2:24
    to install the ruby-build plugin. 2:27
    Rbenv has plugins which provide various functionality, and 2:31
    the ruby-build plugin allows you to install new Ruby versions automatically. 2:34
    The command you need to install it is right here at the top of the ruby-build 2:39
    page. 2:42
    So we're gonna copy that. 2:43
    And switch to our terminal and paste it there. 2:46
    Just like before, 2:54
    it'll do a git clone into your home directory into the rbenv plugins folder. 2:55
    And now let's try running it. 3:01
    We do that with the rbenv command and we'll use the install sub command. 3:02
    We're gonna install a specific version of Ruby with the -v flag. 3:08
    We're gonna install version 2.3.0. 3:14
    And they'll download and install that version for us automatically. 3:18
    Again, this might take a little bit. 3:22
    When it returns to the system prompt, your new Ruby version will be installed. 3:26
    Now we're going to wanna set it up to use this new Ruby version 3:31
    in every new shell that you open. 3:33
    We can do that by running the rbenv command, the global sub command. 3:35
    And we'll use the new version that we just installed. 3:42
    Hit enter to run that. 3:46
    And then we can verify our new Ruby version by typing the ruby command 3:47
    along with the -v flag to check the version. 3:52
    And there it is, Ruby version 2.3.0. 3:55

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