Upload Rails app image file to S3

1. Create bucket

Copy ARN of IAM user

Bucket policy

{
    "Version": "2012-10-17",
    "Id": "Policy1544152951996",
    "Statement": [
        {
            "Sid": "Stmt1544152948221",
            "Effect": "Allow",
            "Principal": {
                "AWS": "************①****************"
            },
            "Action": "s3:*",
            "Resource": "arn:aws:s3:::************②**********"
        }
    ]
}

Describe the "user's ARN" that you wrote down earlier in (1) above, and the "bucket name" that you created in (2).

2. fog settings

gemfile

gem 'fog-aws'

bundle install

app/uploaders/image_uploader.rb

if Rails.env.development? || Rails.env.test?
  storage :file
else
  storage :fog
end

Create a file called carrierwave.rb from the root of your application directly under config / initializers.

config/initializers/carrierwave.rb

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
  else
    config.storage = :fog
    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.fog_directory  = 'Bucket name'
    config.asset_host = 'https://s3-ap-northeast-1.amazonaws.com/Bucket name'
  end
end

3. Setting environment variables

ec2 server

#Production environment
$ ssh -i [pem key name].pem ec2-user@[Elastic IP associated with the created EC2 instance]
(Using the downloaded key, ec2-Login as user)
$ sudo vim /etc/environment
#Press i to switch to insert mode and add the following. Do not delete the existing description.
AWS_ACCESS_KEY_ID='Copy the value of Access key ID in the CSV file here'
AWS_SECRET_ACCESS_KEY='Copy the Secret access key value to the CSV file here'
#After editing, press the escape key:Type wq to save and exit

AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY are described in the CSV file downloaded when IAM user was created.

ec2 server

#Production environment
#Log out once to apply the edited environment variable.
$ exit
$ ssh -i [pem key name].pem ec2-user@[Elastic IP associated with the created EC2 instance]
#Make sure the environment variables are applied.
$ env | grep AWS_SECRET_ACCESS_KEY
$ env | grep AWS_ACCESS_KEY_ID

4. Automatic deployment

① Push to GitHub ② Execute "bundle exec cap production deploy"