gateway = Net::SSH::Gateway.new(
  'remotehost.com',
  'username'
)
port = gateway.open('127.0.0.1', 3306, 3307)

# use cmd line to verify connection over ssh tunnel
# mysql -u root -p -h 127.0.0.1 --port 3307

client = Mysql2::Client.new(
  host: "127.0.0.1",
  username: 'root',
  password: '',
  database: 'dbname',
  port: port
)
results = client.query("SELECT * FROM projects")
results.each do |row|
  p row
end
client.close

Remote+Query+Over+SSH+Tunnel

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