[RUBY] [Rails] Image posting by CarrierWave [AWS EC2]

Writer's environment

Ruby 2.5.3 Rails gem: fog-aws

I introduced CarrierWave for image posting with Rails, but I encountered many errors while using gem: fog-aws, so I thought that it would be difficult for those who will introduce it from now on, so I decided to leave the settings. It was.

If it is the same environment, the following configuration file should be OK for carrierwave.rb.

carrierwave.rb settings


require 'carrierwave/storage/abstract'
require 'carrierwave/storage/file'
require 'carrierwave/storage/fog'

CarrierWave.configure do |config|
  if Rails.env.development? || Rails.env.test?
    config.storage = :file
    config.enable_processing = false if Rails.env.test?
  elsif Rails.env.production?
    config.fog_provider = 'fog/aws'
    config.fog_credentials = {
      provider: 'AWS',
      aws_access_key_id: ENV["AWS_ACCESS_KEY_ID"],
      aws_secret_access_key: ENV["AWS_SECRET_ACCESS_KEY"],
      region: 'ap-northeast-1'
    config.storage = :fog
    config.fog_directory = 'Your S3 bucket name'
    config.asset_host = 'https://s3.ap-northeast-1.amazonaws.com/Your S3 bucket name'

CarrierWave::SanitizedFile.sanitize_regexp = /[^[:word:]\.\-\+]/


-Images are retained in AWS S3 only in the production environment. The development environment is saved locally. -Be careful about the storage directory of carrierwave.rb. app / config / initializers / carrierwave.rb.


CarrierWave::SanitizedFile.sanitize_regexp = /[^[:word:]\.\-\+]/

This code at the bottom is a sentence that enables carrierwave to be used because Japanese cannot be used in the file name by default. You can prevent garbled characters.


aws_access_key_id: ENV["AWS_ACCESS_KEY_ID"],
aws_secret_access_key: ENV["AWS_SECRET_ACCESS_KEY"]

For, specify environment variables in your .env file.

AWS S3 settings

I had a lot of trouble setting up S3, so I'd like to keep it in the screenshot.

スクリーンショット 2020-10-07 15.02.06.png The properties of my bucket in S3. Only logging is enabled. By the way, all the detailed settings below are also invalid.

スクリーンショット 2020-10-07 15.05.36.png Block public access. Only two are turned on.

スクリーンショット 2020-10-07 15.06.47.png Bucket policy editor. Please change the bucket name etc. by yourself.

I'll put the code below so that I can copy it.

Bucket policy

    "Version": "2012-10-17",
    "Statement": [
            "Sid": "Stmt000001",
            "Effect": "Allow",
            "Principal": {
                "AWS": "Your user's ARN(Confirmed from IAM)"
            "Action": "s3*",
            "Resource": "arn:aws:s3:::Your S3 bucket name"

No other items have been set.

Impressions of Carrier Wave

CarrierWave is convenient for image resizing, but it was a little difficult to deploy to AWS EC2 and use S3. I would also like to study Active Storage. I hope it will be an article to help someone even a little!

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