capistrano/docs/documentation/faq/how-can-i-get-capistrano-to-prompt-for-a-password/index.markdown

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How can I get Capistrano to prompt for a password?	default

Password authentication can be done via ask in your deploy environment file (e.g.: config/environments/production.rb)

    # Capistrano > 3.2.0 supports echo: false
		ask(:password, nil, echo: false)
		server 'server.domain.com', user: 'ssh_user_name', port: 22, password: fetch(:password), roles: %w{web app db}