Error ExecJS :: RuntimeUnavailable: What to do when it occurs

Occurrence phenomenon

The following Error occurs when executing $ rake secret when setting environment variables when setting the Web server and application server on AWS EC2.


ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See for a list of available runtimes.
/var/www/chat-space/config/application.rb:7:in `<top (required)>'
/var/www/chat-space/Rakefile:4:in `require_relative'
/var/www/chat-space/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

→ Javascript is not running well, so install Node.js.

install confirmation

In a local environment


$ node --version

Install in AWS production environment


sudo yum install nodejs --enablerepo=epel ← execute
Loaded plugin:priorities, update-motd, upgrade-helper
amzn-main                                                          | 2.1 kB  00:00:00     
amzn-updates                                                       | 3.8 kB  00:00:00     
epel/x86_64/metalink                                               | 5.3 kB  00:00:00     
epel                                                               | 4.7 kB  00:00:00     
nodesource                                                         | 2.5 kB  00:00:00     
(1/3): epel/x86_64/group_gz                                        |  74 kB  00:00:00     
(2/3): epel/x86_64/updateinfo                                      | 789 kB  00:00:00     
(3/3): epel/x86_64/primary_db                                      | 6.1 MB  00:00:00     
1073 packages excluded due to repository priority protections
Resolving dependencies
-->Performing transaction confirmation.
--->Package nodejs.x86_64 2:6.17.1-Install 1nodesource
-->I'm dealing with dependencies: python >= 2.6 packages: 2:nodejs-6.17.1-1nodesource.x86_64
-->Performing transaction confirmation.
--->Package python26.x86_64 0:2.6.9-2.89.Install amzn1
-->I'm dealing with dependencies: python26-2.6.9-2.89.amzn1.x86_64
-->Performing transaction confirmation.
--->Package python26-libs.x86_64 0:2.6.9-2.89.Install amzn1
-->Dependency resolution finished.

Resolved the dependency

Package architecture
Version repository capacity
During installation:
 nodejs               x86_64        2:6.17.1-1nodesource          nodesource         13 M
Dependency related installation:
 python26             x86_64        2.6.9-2.89.amzn1              amzn-main         5.8 M
 python26-libs        x86_64        2.6.9-2.89.amzn1              amzn-main         697 k

Transaction summary
Installation 1 package(+Two dependency packages)

Total download capacity: 20 M
Installation capacity: 59 M
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/latest/nodesource/packages/nodejs-6.17.1-1nodesource.x86_64.rpm:Header V4 RSA/SHA512 Signature, key ID 34fa74dd: NOKEY
nodejs-6.17.1-1nodesource.x86_64.rpm public key is not installed
(1/3): nodejs-6.17.1-1nodesource.x86_64.rpm                        |  13 MB  00:00:00     
(2/3): python26-libs-2.6.9-2.89.amzn1.x86_64.rpm                   | 697 kB  00:00:00     
(3/3): python26-2.6.9-2.89.amzn1.x86_64.rpm                        | 5.8 MB  00:00:01     
16 MB in total/s |  20 MB  00:00:01     
file:///etc/pki/rpm-gpg/NODESOURCE-GPG-SIGNING-KEY-Obtaining the key from EL.
Importing GPG key 0x34FA74DD:
 Userid     : "NodeSource <[email protected]>"
 Fingerprint: 2e55 207a 95d9 944b 0cc9 3261 5ddb e8d4 34fa 74dd
 Package    : nodesource-release-el7-1.noarch (installed)
 From       : /etc/pki/rpm-gpg/NODESOURCE-GPG-SIGNING-KEY-EL
Perform the above processing. is this good?[y/N]y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
During installation: python26-libs-2.6.9-2.89.amzn1.x86_64                     1/3 
During installation: python26-2.6.9-2.89.amzn1.x86_64                          2/3 
During installation: 2:nodejs-6.17.1-1nodesource.x86_64                        3/3 
During verification: 2:nodejs-6.17.1-1nodesource.x86_64                        1/3 
During verification: python26-2.6.9-2.89.amzn1.x86_64                          2/3 
During verification: python26-libs-2.6.9-2.89.amzn1.x86_64                     3/3 

  nodejs.x86_64 2:6.17.1-1nodesource                                                      

I have installed dependency related:
  python26.x86_64 0:2.6.9-2.89.amzn1        python26-libs.x86_64 0:2.6.9-2.89.amzn1       

Has completed!

With the above, javascript can be run even in the production environment.

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