Add Ruby upgrade instructions
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# Updating Ruby from source
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This guide explains how to update Ruby in case you installed it from source according to the instructions in https://github.com/gitlabhq/gitlabhq/blob/master/doc/install/installation.md#2-ruby .
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### 1. Look for Ruby versions
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This guide will only update `/usr/local/bin/ruby`. You can see which Ruby binaries are installed on your system by running:
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```bash
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ls -l $(which -a ruby)
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```
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### 2. Stop GitLab
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```bash
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sudo service gitlab stop
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```
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### 3. Install or update dependencies
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Here we are assuming you are using Debian/Ubuntu.
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```bash
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sudo apt-get install build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev libffi-dev curl
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```
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### 4. Download, compile and install Ruby
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Pick a Ruby version at https://www.ruby-lang.org/en/downloads/ . Here we use Ruby 2.0.0p353, which is patched against [CVE-2013-4164](https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/).
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```bash
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cd /tmp
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curl --progress http://cache.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p353.tar.gz | tar xz
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cd ruby-2.0.0-p353
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./configure --disable-install-rdoc
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make
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sudo make install # overwrite the existing Ruby in /usr/local/bin
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```
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### 5. Reinstall GitLab gem bundle
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Just to be sure we will reinstall the gems used by GitLab. Note that the `bundle install` command [depends on your choice of database](https://github.com/gitlabhq/gitlabhq/blob/master/doc/install/installation.md#install-gems).
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```bash
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cd /home/git/gitlab
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sudo -u git -H rm -rf vendor/bundle # remove existing Gem bundle
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sudo -u git -H bundle install --deployment --without development test postgres aws # Assuming MySQL
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```
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### 6. Start GitLab
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We are now ready to restart GitLab.
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```bash
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sudo service gitlab start
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```
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### Done
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