使用Capistrano部署Rails 7时遇SSHKit执行错误求助

首次尝试用Capistrano将Rails 7应用部署到Vultr VPS，遵循GoRails部署指南，前期步骤正常，但执行cap production deploy时出错。环境配置如下：

• Ubuntu 22.04.2 LTS Jammy（客户端与服务器）
• Ruby 3.2.2 / Rails 7.0.4.2
• rbenv 1.2.0-59-g0704e65
• Bundler version 2.4.10
• capistrano (3.17.2)
• capistrano-bundler (2.1.0)
• capistrano-passenger (0.2.1)
• capistrano-rails (1.6.2)
• capistrano-rbenv (2.2.0)
• net-ssh (7.1.0)
• openssl (default: 3.1.0)

服务器配置HostKey /etc/ssh/ssh_host_ed25519_key时的报错 #

verify_host_key: :secure is deprecated, use :always
Thread:0x00007f169f27a710 /home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/sshkit-1.21.4/lib/sshkit/runners/parallel.rb:10 run> terminated with exception (report_on_exception is true):
/home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/sshkit-1.21.4/lib/sshkit/runners/parallel.rb:15:in rescue in block (2 levels) in execute': Exception while executing as deploy@xx.xx.xx.xx: could not settle on host_key algorithm (SSHKit::Runner::ExecuteError)
Server host_key preferences: ssh-ed25519
Client host_key preferences: ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,ssh-rsa-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512
from /home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/sshkit-1.21.4/lib/sshkit/runners/parallel.rb:11:inblock (2 levels) in execute'
/home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/net-ssh-7.1.0/lib/net/ssh/transport/algorithms.rb:410:in `negotiate': could not settle on host_key algorithm (Net::SSH::Exception)
Server host_key preferences: ssh-ed25519
Client host_key preferences: ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,ssh-rsa-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512
...
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy@xx.xx.xx.xx: could not settle on host_key algorithm
Server host_key preferences: ssh-ed25519
Client host_key preferences: ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,ssh-rsa-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512

服务器未配置HostKey时的报错 #

verify_host_key: :secure is deprecated, use :always
Thread:0x00007f0d3c68a6c8 /home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/sshkit-1.21.4/lib/sshkit/runners/parallel.rb:10 run> terminated with exception (report_on_exception is true):
/home/user/.rbenv/versions/3.2.0/lib/ruby/gems/3.2.0/gems/sshkit-1.21.4/lib/sshkit/runners/parallel.rb:15:in `rescue in block (2 levels) in execute': Exception while executing as deploy@xx.xx.xx.xx: fingerprint SHA256:6EF6B30F9E557F948C402C89002C7C8A is unknown for "xx.xx.xx.xx" (SSHKit::Runner::ExecuteError)
...
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy@xx.xx.xx.xx: fingerprint SHA256:6EF6B30F9E557F948C402C89002C7C8A is unknown for "xx.xx.xx.xx"

Caused by:
Net::SSH::HostKeyUnknown: fingerprint SHA256:6EF6B30F9E557F948C402C89002C7C8A is unknown for "xx.xx.xx.xx"

Tasks: TOP => rbenv:validate
(See full trace by running task with --trace)

已确认可无密码SSH登录服务器，公钥认证正常。已尝试以下方案但未解决问题：

• 删除客户端known_hosts并重新添加服务器指纹
• 在服务器SSH配置中添加PubkeyAcceptedKeyTypes=+ed25519
• 将客户端与服务器的公私钥均改为ed25519格式
• 在deploy.rb的ssh_options中关闭verify_host_key设置

求可行的解决方法，感谢！

内容的提问来源于stack exchange，提问作者user792649