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いつのまにかcapistrano(net-ssh)でed25519が使えるように

Posted at 2019-01-25

どうすれば良いか

Gemfileに次を追加してbundle install

gem 'bcrypt', '~> 3.1.7'

gem 'ed25519'
gem 'bcrypt_pbkdf'

至った経緯

capistrano使っててed25519でAgentForwardできない
- net-ssh 5.x移行で使える
Gemfile.lock/bundle exec gem list確認するとnet-ssh 5.10になっている
config/deploy/staging.rb の ssh_optionsにverbose: :debugを追記してログ確認

E, [2019-01-25T15:09:40.146918 #667] ERROR -- net.ssh.authentication.agent[3ffff3118fcc]: ignoring unimplemented key:unsupported key type `ssh-ed25519'
net-ssh requires the following gems for ed25519 support:
 * ed25519 (>= 1.2, < 2.0)
 * bcrypt_pbkdf (>= 1.0, < 2.0)
See https://github.com/net-ssh/net-ssh/issues/565 for more information

Gemfileを次の様に変更して動作確認

# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'
～省略～
group :development do
  # Use Capistrano for deployment
  gem "capistrano", "~> 3.11", require: false
  gem 'capistrano-rails'
  gem 'ed25519'
  gem 'bcrypt_pbkdf'
end

参考URL等

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