Install Ruby on Rails Server on CentOS 8

In this article, you will learn how to install Ruby on Rails Server on CentOS 8 and create and run a Ruby web application on the same Ruby on Rails server.

 

This Article Provides:

 

What is Ruby on Rails? :

Ruby on Rails, or Rails, is a server-side web application framework written in Ruby under the MIT License. Rails is a MVC (Model-View-Controller) framework, providing default structures for a database, a web service, and web pages. (Courtesy: Wikipedia)

Ruby on Rails encourages and facilitates the use of web standards such as JSON and XML for data transfer; HTML, CSS and JavaScript for user interfacing.

 

Environment Specification:

We are using a CentOS 8 based virtual machine with following specifications.

• CPU - 3.4 Ghz (2 cores)
• Memory - 2 GB
• Storage - 20 GB
• Operating System - CentOS 8.0
• Hostname – ruby-on-rails.centlinux.com
• IP Address - 192.168.116.224 /24

 

Update CentOS 8 Software Packages:

Connect with ruby-on-rails.centlinux.com as root user by using an SSH tool.

Before starting any installation, it is a good practice to update your Linux distribution to the latest software packages.

In CentOS, the software packages are uploaded in online yum repositories as soon as they got updated. Therefore, we can easily update our CentOS 8 server by using a single dnf command.

[root@ruby-on-rails ~]# yum update
...
Installed:
  kernel-4.18.0-147.8.1.el8_1.x86_64
  kernel-core-4.18.0-147.8.1.el8_1.x86_64
  kernel-modules-4.18.0-147.8.1.el8_1.x86_64

Removed:
  kernel-4.18.0-80.el8.x86_64              kernel-core-4.18.0-80.el8.x86_64
  kernel-modules-4.18.0-80.el8.x86_64

Complete!

Since, we frequently update our Linux distros, therefore, only a few packages are updated this time.

 

Install Ruby on Rails Prerequisites on CentOS 8:

Ruby on Rails requires some software packages. However, most of the dependencies are automatically resolved by the RVM (Ruby Version Manager) but there are some software packages that we have to install manually.

The first dependency of Ruby on Rails is Git. Git is available in standard yum repository, therefore we can install git on CentOS 8 as follows.

[root@ruby-on-rails ~]# dnf install -y git
...
Installed:
  git-2.18.2-2.el8_1.x86_64
  perl-IO-Socket-IP-0.39-5.el8.noarch
  perl-IO-Socket-SSL-2.066-3.el8.noarch
  perl-Mozilla-CA-20160104-7.el8.noarch
  git-core-2.18.2-2.el8_1.x86_64
  git-core-doc-2.18.2-2.el8_1.noarch
  perl-Digest-1.17-395.el8.noarch
  perl-Digest-MD5-2.55-396.el8.x86_64
  perl-Error-1:0.17025-2.el8.noarch
  perl-Git-2.18.2-2.el8_1.noarch
  perl-Net-SSLeay-1.88-1.el8.x86_64
  perl-TermReadKey-2.37-7.el8.x86_64
  perl-URI-1.73-3.el8.noarch
  perl-libnet-3.11-3.el8.noarch
  emacs-filesystem-1:26.1-5.el8.noarch
  perl-Carp-1.42-396.el8.noarch
  perl-Data-Dumper-2.167-399.el8.x86_64
  perl-Encode-4:2.97-3.el8.x86_64
  perl-Errno-1.28-416.el8.x86_64
  perl-Exporter-5.72-396.el8.noarch
  perl-File-Path-2.15-2.el8.noarch
  perl-File-Temp-0.230.600-1.el8.noarch
  perl-Getopt-Long-1:2.50-4.el8.noarch
  perl-HTTP-Tiny-0.074-1.el8.noarch
  perl-IO-1.38-416.el8.x86_64
  perl-MIME-Base64-3.15-396.el8.x86_64
  perl-PathTools-3.74-1.el8.x86_64
  perl-Pod-Escapes-1:1.07-395.el8.noarch
  perl-Pod-Perldoc-3.28-396.el8.noarch
  perl-Pod-Simple-1:3.35-395.el8.noarch
  perl-Pod-Usage-4:1.69-395.el8.noarch
  perl-Scalar-List-Utils-3:1.49-2.el8.x86_64
  perl-Socket-4:2.027-3.el8.x86_64
  perl-Storable-1:3.11-3.el8.x86_64
  perl-Term-ANSIColor-4.06-396.el8.noarch
  perl-Term-Cap-1.17-395.el8.noarch
  perl-Text-ParseWords-3.30-395.el8.noarch
  perl-Text-Tabs+Wrap-2013.0523-395.el8.noarch
  perl-Time-Local-1:1.280-1.el8.noarch
  perl-Unicode-Normalize-1.25-396.el8.x86_64
  perl-constant-1.33-396.el8.noarch
  perl-interpreter-4:5.26.3-416.el8.x86_64
  perl-libs-4:5.26.3-416.el8.x86_64
  perl-macros-4:5.26.3-416.el8.x86_64
  perl-parent-1:0.237-1.el8.noarch
  perl-podlators-4.11-1.el8.noarch
  perl-threads-1:2.21-2.el8.x86_64
  perl-threads-shared-1.58-2.el8.x86_64

Complete!

Some components of Ruby on Rails requires Node.js, therefore, we are also need to install it.

Node.js is not available in standard yum repositories. However, Node.js can be installed from NodeSource yum repository.

Add NodeSource yum repository in CentOS 8 server.

[root@ruby-on-rails ~]# curl -sL https://rpm.nodesource.com/setup_12.x | bash -

## Installing the NodeSource Node.js 12.x repo...


## Inspecting system...

+ rpm -q --whatprovides redhat-release || rpm -q --whatprovides centos-release || rpm -q --whatprovides cloudlinux-release || rpm -q --whatprovides sl-release
+ uname -m

## Confirming "el8-x86_64" is supported...

+ curl -sLf -o /dev/null 'https://rpm.nodesource.com/pub_12.x/el/8/x86_64/nodesource-release-el8-1.noarch.rpm'

## As yum will try to install Node.js from the AppStream repository
instead of the NodeSource repository, the AppStream's version of Node.js has to be disabled.
## Run `sudo yum module enable -y nodejs` to reactivate the AppStream's Node.js repository.

+ yum module disable -y nodejs
Last metadata expiration check: 23:08:51 ago on Sat 25 Apr 2020 12:52:37 PM PKT.
Dependencies resolved.
================================================================================
 Package           Architecture     Version             Repository         Size
================================================================================
Disabling modules:
 nodejs

Transaction Summary
================================================================================

Complete!

## Downloading release setup RPM...

+ mktemp
+ curl -sL -o '/tmp/tmp.mwRVNDdser' 'https://rpm.nodesource.com/pub_12.x/el/8/x86_64/nodesource-release-el8-1.noarch.rpm'

## Installing release setup RPM...

+ rpm -i --nosignature --force '/tmp/tmp.mwRVNDdser'

## Cleaning up...

+ rm -f '/tmp/tmp.mwRVNDdser'

## Checking for existing installations...

+ rpm -qa 'node|npm' | grep -v nodesource

## Run `sudo yum install -y nodejs` to install Node.js 12.x and npm.
## You may also need development tools to build native addons:
     sudo yum install gcc-c++ make
## To install the Yarn package manager, run:
     curl -sL https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo
     sudo yum install yarn

Now, we can install Node.js on CentOS 8 with dnf command.

[root@ruby-on-rails ~]# dnf install -y nodejs
...
Installed:
  nodejs-2:12.16.2-1nodesource.x86_64
  python2-pip-9.0.3-14.module_el8.1.0+219+cf9e6ac9.noarch
  python2-setuptools-39.0.1-11.module_el8.1.0+219+cf9e6ac9.noarch
  python2-2.7.16-12.module_el8.1.0+219+cf9e6ac9.x86_64
  python2-libs-2.7.16-12.module_el8.1.0+219+cf9e6ac9.x86_64
  python2-pip-wheel-9.0.3-14.module_el8.1.0+219+cf9e6ac9.noarch
  python2-setuptools-wheel-39.0.1-11.module_el8.1.0+219+cf9e6ac9.noarch

Complete!

Besides Node.js, Ruby on Rails also required YARN (Package Manager). YARN is also provided by its official yum repository. Therefore, we are adding the YARN yum repository in CentOS 8.

[root@ruby-on-rails ~]# curl -sL https://dl.yarnpkg.com/rpm/yarn.repo | tee /etc/yum.repos.d/yarn.repo
[yarn]
name=Yarn Repository
baseurl=https://dl.yarnpkg.com/rpm/
enabled=1
gpgcheck=1
gpgkey=https://dl.yarnpkg.com/rpm/pubkey.gpg

Now, we can easily install yarn using dnf command.

[root@ruby-on-rails ~]# dnf install -y yarn
Yarn Repository                                 338 kB/s | 363 kB     00:01
Dependencies resolved.
================================================================================
 Package         Architecture      Version                Repository       Size
================================================================================
Installing:
 yarn            noarch            1.22.4-1               yarn            1.2 M

Transaction Summary
================================================================================
Install  1 Package

Total download size: 1.2 M
Installed size: 5.1 M
Downloading Packages:
yarn-1.22.4-1.noarch.rpm                        979 kB/s | 1.2 MB     00:01
--------------------------------------------------------------------------------
Total                                           977 kB/s | 1.2 MB     00:01
warning: /var/cache/dnf/yarn-39eb54bf733530c3/packages/yarn-1.22.4-1.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 6963f07f: NOKEY
Yarn Repository                                 6.5 kB/s | 1.6 kB     00:00
Importing GPG key 0x6963F07F:
 Userid     : "Yarn RPM Packaging <yarn@dan.cx>"
 Fingerprint: 9A6F 73F3 4BEB 7473 4D8C 6914 9CBB B558 6963 F07F
 From       : https://dl.yarnpkg.com/rpm/pubkey.gpg
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1
  Installing       : yarn-1.22.4-1.noarch                                   1/1
  Verifying        : yarn-1.22.4-1.noarch                                   1/1

Installed:
  yarn-1.22.4-1.noarch

Complete!

 

Install MariaDB Server on CentOS 8:

MariaDB Server 10.3 is available in standard yum repository, therefore, we are installing it using dnf command.

[root@ruby-on-rails ~]# dnf install -y mariadb-server
...
Installed:
  mariadb-devel-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-server-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-backup-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-gssapi-server-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-server-utils-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-common-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  mariadb-connector-c-3.0.7-1.el8.x86_64
  mariadb-connector-c-config-3.0.7-1.el8.noarch
  mariadb-connector-c-devel-3.0.7-1.el8.x86_64
  mariadb-errmsg-3:10.3.17-1.module_el8.1.0+257+48736ea6.x86_64
  perl-DBD-MySQL-4.046-3.module_el8.1.0+203+e45423dc.x86_64
  perl-DBI-1.641-3.module_el8.1.0+199+8f0a6bbd.x86_64
  keyutils-libs-devel-1.5.10-6.el8.x86_64
  krb5-devel-1.17-9.el8.x86_64
  libcom_err-devel-1.44.6-3.el8.x86_64
  libkadm5-1.17-9.el8.x86_64
  libselinux-devel-2.9-2.1.el8.x86_64
  libsepol-devel-2.9-1.el8.x86_64
  libverto-devel-0.3.0-5.el8.x86_64
  openssl-devel-1:1.1.1c-2.el8_1.1.x86_64
  pcre2-devel-10.32-1.el8.x86_64
  pcre2-utf16-10.32-1.el8.x86_64
  pcre2-utf32-10.32-1.el8.x86_64
  perl-Math-BigInt-1:1.9998.11-7.el8.noarch
  perl-Math-Complex-1.59-416.el8.noarch
  psmisc-23.1-3.el8.x86_64
  zlib-devel-1.2.11-10.el8.x86_64

Complete!

Enable and start MariaDB service.

[root@ruby-on-rails ~]# systemctl enable --now mariadb.service
Created symlink /etc/systemd/system/mysql.service â /usr/lib/systemd/system/mariadb.service.
Created symlink /etc/systemd/system/mysqld.service â /usr/lib/systemd/system/mariadb.service.
Created symlink /etc/systemd/system/multi-user.target.wants/mariadb.service â /usr/lib/systemd/system/mariadb.service.

Configure MariaDB server and set root user password using following command.

[root@ruby-on-rails ~]# mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] Y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] Y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] Y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] Y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] Y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

We have successfully installed MariaDB Server on CentOS 8.

 

Install RVM on CentOS 8:

RVM (Ruby Version Manager) is a command line tool that allows you to easily install, manage work with multiple Ruby environments from interpreter to set of gems.

We are installing RVM on CentOS 8 and later we will install Ruby by using RVM commandline.

RVM is available in its official yum repository. Therefore, we need to add the RVM yum repository in CentOS 8.

Before adding RVM yum repository, we are required to add the GPG key for the RVM repo as follows.

[root@ruby-on-rails ~]# gpg --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
gpg: directory '/root/.gnupg' created
gpg: keybox '/root/.gnupg/pubring.kbx' created
gpg: key 105BD0E739499BDB: 8 signatures not checked due to missing keys
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 105BD0E739499BDB: public key "Piotr Kuczynski <piotr.kuczynski@gmail.com>" imported
gpg: key 3804BB82D39DC0E3: 108 signatures not checked due to missing keys
gpg: key 3804BB82D39DC0E3: public key "Michal Papis (RVM signing) <mpapis@gmail.com>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 2
gpg:               imported: 2

If you face problem installing the GPG key, then you should refer to RVM official website.

Now, we can install RVM as follows.

[root@ruby-on-rails ~]# curl -sSL https://get.rvm.io | bash -s stable
Downloading https://github.com/rvm/rvm/archive/1.29.10.tar.gz
Downloading https://github.com/rvm/rvm/releases/download/1.29.10/1.29.10.tar.gz.asc
gpg: Signature made Thu 26 Mar 2020 02:58:42 AM PKT
gpg:                using RSA key 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
gpg: Good signature from "Piotr Kuczynski <piotr.kuczynski@gmail.com>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 7D2B AF1C F37B 13E2 069D  6956 105B D0E7 3949 9BDB
GPG verified '/usr/local/rvm/archives/rvm-1.29.10.tgz'
Creating group 'rvm'
Installing RVM to /usr/local/rvm/
Installation of RVM in /usr/local/rvm/ is almost complete:

  * First you need to add all users that will be using rvm to 'rvm' group,
    and logout - login again, anyone using rvm will be operating with `umask u=rwx,g=rwx,o=rx`.

  * To start using RVM you need to run `source /etc/profile.d/rvm.sh`
    in all your open shell windows, in rare cases you need to reopen all shell windows.
  * Please do NOT forget to add your users to the rvm group.
     The installer no longer auto-adds root or users to the rvm group. Admins must do this.
     Also, please note that group memberships are ONLY evaluated at login time.
     This means that users must log out then back in before group membership takes effect!
Thanks for installing RVM ð
Please consider donating to our open collective to help us maintain RVM.

ð  Donate: https://opencollective.com/rvm/donate

However, we can also install latest stable Ruby and Rails along with the RVM. But we are installing each component separately for the sake of demonstration.

RVM environment script has been copied to /etc/profile.d/ directory. To set the RVM environment for the current session, we need to execute it once.

[root@ruby-on-rails ~]# source /etc/profile.d/rvm.sh

RVM has been installed on CentOS 8.

 

Install Ruby on CentOS 8:

Check and resolve any missing prerequisites for Ruby by using the rvm command.

[root@ruby-on-rails ~]# rvm requirements
Checking requirements for centos.
Installing requirements for centos.
Installing required packages: patch, autoconf, automake, bison, bzip2, gcc-c++, libffi-devel, libtool, make, patch, readline-devel, ruby, sqlite-devel, glibc-headers, glibc-devel........................
Requirements installation successful.

Check list of known versions of Ruby language.

[root@ruby-on-rails ~]# rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.9]
[ruby-]2.5[.7]
[ruby-]2.6[.5]
[ruby-]2.7[.0]
ruby-head

# for forks use: rvm install ruby-head-<name> --url https://github.com/github/ruby.git --branch 2.2

# JRuby
jruby-1.6[.8]
jruby-1.7[.27]
jruby-9.1[.17.0]
jruby[-9.2.11.1]
jruby-head

# Rubinius
rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx-2[.5.8]
rbx-3[.107]
rbx-4[.12]
rbx-head

# TruffleRuby
truffleruby[-20.0.0]

# Opal
opal

# Minimalistic ruby implementation - ISO 30170:2012
mruby-1.0.0
mruby-1.1.0
mruby-1.2.0
mruby-1.3.0
mruby-1[.4.1]
mruby-2.0.1
mruby-2[.1.0]
mruby[-head]

# Ruby Enterprise Edition
ree-1.8.6
ree[-1.8.7][-2012.02]

# Topaz
topaz

# MagLev
maglev-1.0.0
maglev-1.1[RC1]
maglev[-1.2Alpha4]
maglev-head

# Mac OS X Snow Leopard Or Newer
macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head

# IronRuby
ironruby[-1.1.3]
ironruby-head

Install your required version of Ruby. We are installing MRI Ruby 2.7 as follows.

[root@ruby-on-rails ~]# rvm install 2.7
Searching for binary rubies, this might take some time.
No binary rubies available for: centos/8/x86_64/ruby-2.7.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for centos.
Requirements installation successful.
Installing Ruby from source to: /usr/local/rvm/rubies/ruby-2.7.0, this may take a while depending on your cpu(s)...
ruby-2.7.0 - #downloading ruby-2.7.0, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 14.0M  100 14.0M    0     0  1134k      0  0:00:12  0:00:12 --:--:-- 1211k
ruby-2.7.0 - #extracting ruby-2.7.0 to /usr/local/rvm/src/ruby-2.7.0.....
ruby-2.7.0 - #configuring........................................................................
ruby-2.7.0 - #post-configuration..
ruby-2.7.0 - #compiling............................................................................................
ruby-2.7.0 - #installing..................
ruby-2.7.0 - #making binaries executable...
Installed rubygems 3.1.2 is newer than 3.0.8 provided with installed ruby, skipping installation, use --force to force installation.
ruby-2.7.0 - #gemset created /usr/local/rvm/gems/ruby-2.7.0@global
ruby-2.7.0 - #importing gemset /usr/local/rvm/gemsets/global.gems................................................................
ruby-2.7.0 - #generating global wrappers.......
ruby-2.7.0 - #gemset created /usr/local/rvm/gems/ruby-2.7.0
ruby-2.7.0 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.7.0 - #generating default wrappers.......
ruby-2.7.0 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.7.0 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri

By using RVM, we can install multiple Ruby environments on the same platform. Therefore, we need to set a default version in use.

Set default version of Ruby language.

[root@ruby-on-rails ~]# rvm use 2.7 --default
Using /usr/local/rvm/gems/ruby-2.7.0

Verify the current Ruby version.

[root@ruby-on-rails ~]# ruby --version
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]

Ruby language has been installed on CentOS 8.

 

Install Ruby on Rails on CentOS 8:

Now its time to install Rails on CentOS 8 server. We can do this conveniently by using the gem (Ruby Package Manager).

[root@ruby-on-rails ~]# gem install rails
Fetching concurrent-ruby-1.1.6.gem
Fetching mini_portile2-2.4.0.gem
Fetching nokogiri-1.10.9.gem
Fetching crass-1.0.6.gem
Fetching loofah-2.5.0.gem
Fetching rails-html-sanitizer-1.3.0.gem
Fetching rails-dom-testing-2.0.3.gem
Fetching builder-3.2.4.gem
Fetching erubi-1.9.0.gem
Fetching actionview-6.0.2.2.gem
Fetching actionpack-6.0.2.2.gem
Fetching activemodel-6.0.2.2.gem
Fetching activerecord-6.0.2.2.gem
Fetching globalid-0.4.2.gem
Fetching activejob-6.0.2.2.gem
Fetching mini_mime-1.0.2.gem
Fetching mail-2.7.1.gem
Fetching actionmailer-6.0.2.2.gem
Fetching nio4r-2.5.2.gem
Fetching websocket-extensions-0.1.4.gem
Fetching websocket-driver-0.7.1.gem
Fetching actioncable-6.0.2.2.gem
Fetching mimemagic-0.3.4.gem
Fetching marcel-0.3.3.gem
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Successfully installed concurrent-ruby-1.1.6

HEADS UP! i18n 1.1 changed fallbacks to exclude default locale.
But that may break your application.

If you are upgrading your Rails application from an older version of Rails:

Please check your Rails app for 'config.i18n.fallbacks = true'.
If you're using I18n (>= 1.1.0) and Rails (< 5.2.2), this should be
'config.i18n.fallbacks = [I18n.default_locale]'.
If not, fallbacks will be broken in your app by I18n 1.1.x.

If you are starting a NEW Rails application, you can ignore this notice.

For more info see:
https://github.com/svenfuchs/i18n/releases/tag/v1.1.0

Successfully installed i18n-1.8.2
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Successfully installed mini_portile2-2.4.0
Building native extensions. This could take a while...
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Successfully installed crass-1.0.6
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Building native extensions. This could take a while...
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Done installing documentation for concurrent-ruby, i18n, thread_safe, tzinfo, zeitwerk, activesupport, rack, rack-test, mini_portile2, nokogiri, crass, loofah, rails-html-sanitizer, rails-dom-testing, builder, erubi, actionview, actionpack, activemodel, activerecord, globalid, activejob, mini_mime, mail, actionmailer, nio4r, websocket-extensions, websocket-driver, actioncable, mimemagic, marcel, activestorage, actionmailbox, actiontext, thor, method_source, railties, sprockets, sprockets-rails, rails after 68 seconds
40 gems installed

Verify version of Rails.

[root@ruby-on-rails ~]# rails -v
Rails 6.0.2.2

Ruby on Rails default service port is 3000/tcp. Therefore, we need to allow this port in Linux firewall.

[root@ruby-on-rails ~]# firewall-cmd --permanent --add-port=3000/tcp
success
[root@ruby-on-rails ~]# firewall-cmd --reload
success

 

Install Required Ruby Gems on CentOS 8:

We are installing mysql2 gem, for Ruby connectivity with MariaDB/MySQL database servers.

[root@ruby-on-rails ~]# gem install mysql2
Fetching mysql2-0.5.3.gem
Building native extensions. This could take a while...
Successfully installed mysql2-0.5.3
Parsing documentation for mysql2-0.5.3
Installing ri documentation for mysql2-0.5.3
Done installing documentation for mysql2 after 0 seconds
1 gem installed

Bundler provides a consistent environment for Ruby projects by tracking and installing the exact gems and versions that are needed.

We can install Bundler by using the gem command.

[root@ruby-on-rails ~]# gem install bundler
Fetching bundler-2.1.4.gem
Successfully installed bundler-2.1.4
Parsing documentation for bundler-2.1.4
Installing ri documentation for bundler-2.1.4
Done installing documentation for bundler after 4 seconds
1 gem installed

Our Ruby on Rails server is configured and ready to use now.

 

HelloWorld - First Ruby Project:

To test our Ruby on Rails environment, we are creating a HelloWorld Project.

Following command will create the HelloWorld project directory with default skeleton of files and directories.

[root@ruby-on-rails ~]# rails new HelloWorld -d mysql
...
ââ serve-index@1.9.1
ââ serve-static@1.14.1
ââ sockjs-client@1.4.0
ââ sockjs@0.3.19
ââ spdy-transport@3.0.0
ââ spdy@4.0.2
ââ thunky@1.1.0
ââ type-is@1.6.18
ââ unpipe@1.0.0
ââ utils-merge@1.0.1
ââ wbuf@1.7.3
ââ webpack-dev-middleware@3.7.2
ââ webpack-dev-server@3.10.3
ââ websocket-extensions@0.1.3
ââ ws@6.2.1
ââ yargs-parser@11.1.1
ââ yargs@12.0.5
Done in 11.72s.

Set MariaDB database credentials in the database.yml file.

[root@ruby-on-rails ~]# cd HelloWorld
[root@ruby-on-rails HelloWorld]# vi config/database.yml

Under the default configurations set the root user password.

default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: 123 # Set the MariaDB Password here
  socket: /var/lib/mysql/mysql.sock

Create the database for our Ruby project by using rake command.

[root@ruby-on-rails HelloWorld]# rake db:create
/usr/local/rvm/gems/ruby-2.7.0/gems/actionpack-6.0.2.2/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/usr/local/rvm/gems/ruby-2.7.0/gems/actionpack-6.0.2.2/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
Created database 'HelloWorld_development'
Created database 'HelloWorld_test'

Start our Ruby on Rails application.

[root@ruby-on-rails HelloWorld]# rails server -b 0.0.0.0
Warning: the running version of Bundler (2.1.2) is older than the version that created the lockfile (2.1.4). We suggest you to upgrade to the version that created the lockfile by running `gem install bundler:2.1.4`.
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Warning: the running version of Bundler (2.1.2) is older than the version that created the lockfile (2.1.4). We suggest you to upgrade to the version that created the lockfile by running `gem install bundler:2.1.4`.
=> Booting Puma
=> Rails 6.0.2.2 application starting in development
=> Run `rails server --help` for more startup options
/usr/local/rvm/gems/ruby-2.7.0/gems/actionpack-6.0.2.2/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/usr/local/rvm/gems/ruby-2.7.0/gems/actionpack-6.0.2.2/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
Puma starting in single mode...
* Version 4.3.3 (ruby 2.7.0-p0), codename: Mysterious Traveller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop

Browse URL http://ruby-on-rails.centlinux.com:3000 in google chrome browser.

We have successfully installed Ruby on Rails Server on CentOS 8.

If you wish to learn more about the Ruby on Rails, then you should attend Ruby on Rails 6 Complete Beginner's Course [2020] at Udemy or read Agile Web Development with Rails 6 by Pragmatic Bookshelf.