code: def add_slave_server(self):
          
          master = self.args.config[1]
          slave = self.args.add_slave
  
          # install java at slave server
          self.reset_server_env(slave, self.configure)
          if self.prompt_check("Update package at slave server"):
              self.update_source_list()
              self.common_update_sys()
  
          if self.prompt_check("Install java and python at slave server"):
              self.java_install()
              sudo('apt-get install -y python python3 python-dev python3-dev')
  
          # generate ssh key at master server
          if not self.args.skip_master:
              if self.prompt_check("Generate ssh key at Master Server"):
                  self.generate_ssh(master, self.args, self.configure)
  
          # generate ssh key at slave server and make slave connect with master
          if self.prompt_check("Make ssh connection within master and slave"):
              self.generate_ssh(slave, self.args, self.configure)
  
              # scp slave server ssh key to master server
              run('scp ~/.ssh/id_rsa.pub {0}@{1}:~/.ssh/id_rsa.pub.{2}'.format(
                  self.configure[master]['user'],
                  self.configure[master]['host'],
                  slave
              ))
  
              # add slave ssh key to master authorized_keys
              self.reset_server_env(master, self.configure)
              run('cat ~/.ssh/id_rsa.pub* >> ~/.ssh/authorized_keys')
  
              # scp master authorized_keys to slave authorized_keys
              run('scp ~/.ssh/authorized_keys {0}@{1}:~/.ssh'.format(
                  self.configure[slave]['user'],
                  self.configure[slave]['host']
              ))
  
          # config slave and master
          if self.prompt_check("Configure master and slave server"):
              master = self.args.config[1]
              slave = self.args.add_slave
  
              if self.args.bigdata_app == 'spark':
                  self.add_spark_slave(master, slave, self.configure)
docs: 添加slave服务器
          :return: