我尝试使用 vagrant 搭建一个开发环境，其中一段配置文件如下。
(1..NUMBER_OF_WORKER_INSTANCES).each do |i| vm_name = "%s-%02d" % [WORKER_NAME_PREFIX, i] vm_static_ip = WORKER_IP_TEMPLATE % [100 + i] vm_ssh_host_port = "202%01d" % [i] config.vm.define(vm_name) do |worker| worker.vm.box = "ubuntu/trusty64" worker.vm.hostname = vm_name worker.vm.network "private_network", ip: vm_static_ip worker.vm.provider :virtualbox do |vb| vb.name = vm_name vb.memory = 1024 vb.cpus = 1 vb.customize ["modifyvm", :id, "--nic2", "hostonly"] vb.customize ["modifyvm", :id, "--nicpromisc2", "allow-all"] end worker.vm.provision "shell", path: "scripts/setup-os.sh", privileged:false worker.vm.provision "shell", path: "scripts/setup-java.sh", privileged:false worker.vm.provision "shell" do |s| s.path = "scripts/setup-flink.sh" s.args = " -t #{NUMBER_OF_WORKER_INSTANCES}" s.privileged=false end worker.vm.network "forwarded_port", guest: 22, host: vm_ssh_host_port, id: 'ssh' end 在调试 vagrantfile 的过程中，引入的脚本报错，于是修改之后继续使用 vagrant up 启动虚拟机，这个时候会报错，端口被宿主机占用，我尝试多次更换端口之后 up 或者 reload，发现每一个新换的端口都会被报错占用。请教大家一下这是为什么？
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