qemu: Timeout waiting for SSH Build 'qemu' errored: Timeout waiting for SSH.
linux:CentOS Linux release 7.3.1611
Packer version: 1.0.0
qemu version : 1.5.3
cvm.json

    "builders":
    [
        {
            "type": "qemu",
            "qemu_binary" : "/usr/libexec/qemu-kvm",
            "iso_url": "/usr/local/bin/CentOS-7-x86_64-DVD-1511.iso",
            "iso_checksum": "c875b0f1dabda14f00a3e261d241f63e",
            "iso_checksum_type": "md5",
            "output_directory": "/root/cvm",
            "shutdown_command": "shutdown -P now",
            "disk_size": 500000,
            "format": "qcow2",
            "headless": false,
            "accelerator": "kvm",
            "http_directory": "/var/www/html",
            "http_port_min": 10082,
            "http_port_max": 10089,
            "ssh_host_port_min": 2222,
            "ssh_host_port_max": 2229,
            "ssh_username": "root",
            "ssh_password": "s0m3password",
            "ssh_port": 22,
            "ssh_wait_timeout": "2m",
            "vm_name": "cvm_test",
            "net_device": "virtio-net",
            "disk_interface": "virtio",
            "boot_wait": "5s",
            "boot_command": [
               "<tab> text ks=http://172.16.21.86/ks.cfg<enter><wait>"
      ]
        }
    ]
}

**ks.cfg **

install
# Keyboard layouts
keyboard --vckeymap=us --xlayouts='us'
reboot

timezone Asia/Shanghai --isUtc

#url --url="http://172.16.21.86/centos";
rootpw s0m3password
# Firewall configuration
firewall --disabled
# Network information
#network  --bootproto=dhcp --onboot=yes --noipv6 --hostname=localhost
network --onboot yes --device eth0 --bootproto dhcp
# System authorization information
auth  --useshadow  --passalgo=sha512
# SELinux configuration
selinux --disabled

# System bootloader configuration
bootloader --location=mbr --boot-drive=sdb
# Clear the Master Boot Record
zerombr

autopart --type=lvm
# Partition clearing information
clearpart --all --initlabel 
# Disk partitioning information
ignoredisk --only-use=sdb
#part /boot --fstype=ext4 --size=1024 --ondisk=sda
#part swap  --fstype=swap --size=1024 --ondisk=sda
#part /home  --fstype=ext4 --size=204800 --ondisk=sda
#part /  --fstype=ext4 --size=204800 --ondisk=sda

%packages
@core
openssh-clients
libvirt
vim
ntp
java-1.8.0-openjdk.x86_64
%end

%post --interpreter=/bin/bash

sed -i "s/#PermitRootLogin yes/PermitRootLogin yes/g" /etc/ssh/sshd_config
%end

the output of packer

[root@localhost bin]# export PACKER_LOG=1 && packer build cvm.json 
2017/06/07 18:51:18 [INFO] Packer version: 1.0.0
2017/06/07 18:51:18 Packer Target OS/Arch: linux amd64
2017/06/07 18:51:18 Built with Go Version: go1.8
2017/06/07 18:51:18 Detected home directory from env var: /root
2017/06/07 18:51:18 Using internal plugin for virtualbox-ovf
2017/06/07 18:51:18 Using internal plugin for amazon-chroot
2017/06/07 18:51:18 Using internal plugin for amazon-ebsvolume
2017/06/07 18:51:18 Using internal plugin for hyperv-iso
2017/06/07 18:51:18 Using internal plugin for profitbricks
2017/06/07 18:51:18 Using internal plugin for qemu
2017/06/07 18:51:18 Using internal plugin for vmware-iso
2017/06/07 18:51:18 Using internal plugin for amazon-instance
2017/06/07 18:51:18 Using internal plugin for cloudstack
2017/06/07 18:51:18 Using internal plugin for file
2017/06/07 18:51:18 Using internal plugin for googlecompute
2017/06/07 18:51:18 Using internal plugin for openstack
2017/06/07 18:51:18 Using internal plugin for amazon-ebs
2017/06/07 18:51:18 Using internal plugin for azure-arm
2017/06/07 18:51:18 Using internal plugin for null
2017/06/07 18:51:18 Using internal plugin for parallels-iso
2017/06/07 18:51:18 Using internal plugin for triton
2017/06/07 18:51:18 Using internal plugin for virtualbox-iso
2017/06/07 18:51:18 Using internal plugin for vmware-vmx
2017/06/07 18:51:18 Using internal plugin for amazon-ebssurrogate
2017/06/07 18:51:18 Using internal plugin for digitalocean
2017/06/07 18:51:18 Using internal plugin for docker
2017/06/07 18:51:18 Using internal plugin for oneandone
2017/06/07 18:51:18 Using internal plugin for parallels-pvm
2017/06/07 18:51:18 Using internal plugin for powershell
2017/06/07 18:51:18 Using internal plugin for ansible
2017/06/07 18:51:18 Using internal plugin for converge
2017/06/07 18:51:18 Using internal plugin for file
2017/06/07 18:51:18 Using internal plugin for chef-client
2017/06/07 18:51:18 Using internal plugin for salt-masterless
2017/06/07 18:51:18 Using internal plugin for shell-local
2017/06/07 18:51:18 Using internal plugin for ansible-local
2017/06/07 18:51:18 Using internal plugin for shell
2017/06/07 18:51:18 Using internal plugin for windows-restart
2017/06/07 18:51:18 Using internal plugin for windows-shell
2017/06/07 18:51:18 Using internal plugin for chef-solo
2017/06/07 18:51:18 Using internal plugin for puppet-masterless
2017/06/07 18:51:18 Using internal plugin for puppet-server
2017/06/07 18:51:18 Using internal plugin for amazon-import
2017/06/07 18:51:18 Using internal plugin for artifice
2017/06/07 18:51:18 Using internal plugin for atlas
2017/06/07 18:51:18 Using internal plugin for docker-push
2017/06/07 18:51:18 Using internal plugin for vagrant
2017/06/07 18:51:18 Using internal plugin for vagrant-cloud
2017/06/07 18:51:18 Using internal plugin for checksum
2017/06/07 18:51:18 Using internal plugin for docker-import
2017/06/07 18:51:18 Using internal plugin for docker-tag
2017/06/07 18:51:18 Using internal plugin for googlecompute-export
2017/06/07 18:51:18 Using internal plugin for compress
2017/06/07 18:51:18 Using internal plugin for docker-save
2017/06/07 18:51:18 Using internal plugin for manifest
2017/06/07 18:51:18 Using internal plugin for shell-local
2017/06/07 18:51:18 Using internal plugin for vsphere
2017/06/07 18:51:18 Detected home directory from env var: /root
2017/06/07 18:51:18 Attempting to open config file: /root/.packerconfig
2017/06/07 18:51:18 [WARN] Config file doesn't exist: /root/.packerconfig
2017/06/07 18:51:18 Packer config: &{DisableCheckpoint:false 
DisableCheckpointSignature:false PluginMinPort:10000 PluginMaxPort:25000 
Builders:map[amazon-ebsvolume:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-amazon-ebsvolume
 file:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-file 
amazon-ebs:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-amazon-ebs
 
azure-arm:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-azure-arm
 null:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-null 
triton:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-triton
 
amazon-ebssurrogate:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-amazon-ebssurrogate
 
parallels-pvm:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-parallels-pvm
 
vmware-vmx:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-vmware-vmx
 
digitalocean:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-digitalocean
 
amazon-chroot:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-amazon-chroot
 
hyperv-iso:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-hyperv-iso
 
profitbricks:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-profitbricks
 qemu:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-qemu 
cloudstack:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-cloudstack
 
googlecompute:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-googlecompute
 
docker:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-docker
 
oneandone:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-oneandone
 
virtualbox-ovf:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-virtualbox-ovf
 
vmware-iso:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-vmware-iso
 
amazon-instance:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-amazon-instance
 
openstack:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-openstack
 
parallels-iso:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-parallels-iso
 
virtualbox-iso:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-builder-virtualbox-iso]
 
PostProcessors:map[docker-tag:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-docker-tag
 
googlecompute-export:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-googlecompute-export
 
compress:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-compress
 
manifest:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-manifest
 
docker-import:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-docker-import
 
docker-save:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-docker-save
 
vsphere:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-vsphere
 
artifice:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-artifice
 
checksum:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-checksum
 
amazon-import:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-amazon-import
 
atlas:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-atlas
 
docker-push:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-docker-push
 
vagrant:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-vagrant
 
vagrant-cloud:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-vagrant-cloud
 
shell-local:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-post-processor-shell-local]
 
Provisioners:map[chef-solo:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-chef-solo
 
puppet-masterless:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-puppet-masterless
 
file:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-file
 
chef-client:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-chef-client
 
shell:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-shell
 
windows-restart:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-windows-restart
 
ansible:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-ansible
 
shell-local:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-shell-local
 
windows-shell:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-windows-shell
 
converge:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-converge
 
salt-masterless:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-salt-masterless
 
puppet-server:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-puppet-server
 
powershell:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-powershell
 
ansible-local:/usr/local/bin/packer-PACKERSPACE-plugin-PACKERSPACE-packer-provisioner-ansible-local]}
2017/06/07 18:51:18 Setting cache directory: /usr/local/bin/packer_cache
2017/06/07 18:51:18 Loading builder: qemu
2017/06/07 18:51:18 Plugin could not be found. Checking same directory as 
executable.
2017/06/07 18:51:18 Current exe path: /usr/local/bin/packer
2017/06/07 18:51:18 Creating plugin client for path: /usr/local/bin/packer
2017/06/07 18:51:18 Starting plugin: /usr/local/bin/packer 
[]string{"/usr/local/bin/packer", "plugin", "packer-builder-qemu"}
2017/06/07 18:51:18 Waiting for RPC address for: /usr/local/bin/packer
2017/06/07 18:51:18 Detected home directory from env var: /root
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 [INFO] Packer version: 1.0.0
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Packer Target OS/Arch: linux 
amd64
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Built with Go Version: go1.8
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Detected home directory from 
env var: /root
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Attempting to open config file: 
/root/.packerconfig
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 [WARN] Config file doesn't 
exist: /root/.packerconfig
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Packer config: 
&{DisableCheckpoint:false DisableCheckpointSignature:false PluginMinPort:10000 
PluginMaxPort:25000 Builders:map[] PostProcessors:map[] Provisioners:map[]}
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Setting cache directory: 
/usr/local/bin/packer_cache
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 args: 
[]string{"packer-builder-qemu"}
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Plugin minimum port: 10000
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Plugin maximum port: 25000
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Detected home directory from 
env var: /root
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Plugin address: unix 
/tmp/packer-plugin018796200
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Waiting for connection...
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Serving a plugin connection...
2017/06/07 18:51:18 ui: qemu output will be in this color.
2017/06/07 18:51:18 ui: 
2017/06/07 18:51:18 Build debug mode: false
2017/06/07 18:51:18 Force build: false
2017/06/07 18:51:18 On error: 
2017/06/07 18:51:18 Preparing build: qemu
qemu output will be in this color.

2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 use specified accelerator: kvm
2017/06/07 18:51:18 Waiting on builds to complete...
2017/06/07 18:51:18 Starting build run: qemu
2017/06/07 18:51:18 Running builder: qemu
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Qemu path: 
/usr/libexec/qemu-kvm, Qemu Image page: /usr/bin/qemu-img
2017/06/07 18:51:18 ui: ==> qemu: Downloading or copying ISO
==> qemu: Downloading or copying ISO
2017/06/07 18:51:18 ui:     qemu: Downloading or copying: 
file:///usr/local/bin/CentOS-7-x86_64-DVD-1511.iso
    qemu: Downloading or copying: 
file:///usr/local/bin/CentOS-7-x86_64-DVD-1511.iso
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Acquiring lock to download: 
file:///usr/local/bin/CentOS-7-x86_64-DVD-1511.iso
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Parsed URL: 
&url.URL{Scheme:"file", Opaque:"", User:(*url.Userinfo)(nil), Host:"", 
Path:"/usr/local/bin/CentOS-7-x86_64-DVD-1511.iso", RawPath:"", 
ForceQuery:false, RawQuery:"", Fragment:""}
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 [DEBUG] Using local file: 
/usr/local/bin/CentOS-7-x86_64-DVD-1511.iso
2017/06/07 18:51:18 packer: 2017/06/07 18:51:18 Verifying checksum of 
/usr/local/bin/CentOS-7-x86_64-DVD-1511.iso
2017/06/07 18:52:17 packer: 2017/06/07 18:52:17 No floppy files specified. 
Floppy disk will not be made.
2017/06/07 18:52:17 ui: ==> qemu: Creating hard drive...
==> qemu: Creating hard drive...
2017/06/07 18:52:17 packer: 2017/06/07 18:52:17 Executing qemu-img: 
[]string{"create", "-f", "qcow2", "/root/cvm/cvm_test", "500000M"}
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 stdout: Formatting 
'/root/cvm/cvm_test', fmt=qcow2 size=524288000000 encryption=off 
cluster_size=65536 lazy_refcounts=off
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 stderr:
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Trying port: 10087
==> qemu: Starting HTTP server on port 10087
2017/06/07 18:52:19 ui: ==> qemu: Starting HTTP server on port 10087
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Looking for available 
communicator (SSH, WinRM, etc) port between 2222 and 2229
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Trying port: 2223
2017/06/07 18:52:19 ui: ==> qemu: Found port for communicator (SSH, WinRM, 
etc): 2223.
==> qemu: Found port for communicator (SSH, WinRM, etc): 2223.
2017/06/07 18:52:19 ui: ==> qemu: Looking for available port between 5900 and 
6000 on 127.0.0.1
==> qemu: Looking for available port between 5900 and 6000 on 127.0.0.1
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Looking for available port 
between 5900 and 6000 on 127.0.0.1
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Trying port: 5987
2017/06/07 18:52:19 packer: 2017/06/07 18:52:19 Found available VNC port: 5987 
on IP: 127.0.0.1
2017/06/07 18:52:19 ui: ==> qemu: Starting VM, booting from CD-ROM
==> qemu: Starting VM, booting from CD-ROM
2017/06/07 18:52:21 packer: 2017/06/07 18:52:21 Qemu --version output: QEMU 
emulator version 1.5.3 (qemu-kvm-1.5.3-126.el7_3.6), Copyright (c) 2003-2008 
Fabrice Bellard
2017/06/07 18:52:21 packer: 2017/06/07 18:52:21 Qemu version: 1.5.3
    qemu: WARNING: The version of qemu  on your host doesn't support display 
mode.
2017/06/07 18:52:21 ui:     qemu: WARNING: The version of qemu  on your host 
doesn't support display mode.
    qemu: The display parameter will be ignored.
2017/06/07 18:52:21 packer: 2017/06/07 18:52:21 Qemu Builder has no floppy 
files, not attaching a floppy.
2017/06/07 18:52:21 packer: 2017/06/07 18:52:21 Executing 
/usr/libexec/qemu-kvm: []string{"-name", "cvm_test", "-boot", "once=d", 
"-netdev", "user,id=user.0,hostfwd=tcp::2223-:22", "-drive", 
"file=/root/cvm/cvm_test,if=virtio,cache=writeback,format=qcow2", "-cdrom", 
"/usr/local/bin/CentOS-7-x86_64-DVD-1511.iso", "-m", "512M", "-vnc", 
"127.0.0.1:87", "-machine", "type=pc,accel=kvm", "-device", 
"virtio-net,netdev=user.0"}
    qemu: The display parameter will be ignored.
2017/06/07 18:52:21 packer: 2017/06/07 18:52:21 Started Qemu. Pid: 3663
==> qemu: Waiting 5s for boot...
2017/06/07 18:52:23 ui: ==> qemu: Waiting 5s for boot...
2017/06/07 18:52:28 ui: ==> qemu: Connecting to VM via VNC
==> qemu: Connecting to VM via VNC
2017/06/07 18:52:28 packer: 2017/06/07 18:52:28 Connected to VNC desktop: QEMU 
(cvm_test)
2017/06/07 18:52:28 ui: ==> qemu: Typing the boot command over VNC...
==> qemu: Typing the boot command over VNC...
2017/06/07 18:52:28 packer: 2017/06/07 18:52:28 Special code '<tab>' found, 
replacing with: 65289
2017/06/07 18:52:28 packer: 2017/06/07 18:52:28 Sending char ' ', code 32, 
shift false
2017/06/07 18:52:28 packer: 2017/06/07 18:52:28 Sending char 't', code 116, 
shift false
2017/06/07 18:52:29 packer: 2017/06/07 18:52:29 Sending char 'e', code 101, 
shift false
2017/06/07 18:52:29 packer: 2017/06/07 18:52:29 Sending char 'x', code 120, 
shift false
2017/06/07 18:52:29 packer: 2017/06/07 18:52:29 Sending char 't', code 116, 
shift false
2017/06/07 18:52:30 packer: 2017/06/07 18:52:30 Sending char ' ', code 32, 
shift false
2017/06/07 18:52:30 packer: 2017/06/07 18:52:30 Sending char 'k', code 107, 
shift false
2017/06/07 18:52:30 packer: 2017/06/07 18:52:30 Sending char 's', code 115, 
shift false
2017/06/07 18:52:30 packer: 2017/06/07 18:52:30 Sending char '=', code 61, 
shift false
2017/06/07 18:52:31 packer: 2017/06/07 18:52:31 Sending char 'h', code 104, 
shift false
2017/06/07 18:52:31 packer: 2017/06/07 18:52:31 Sending char 't', code 116, 
shift false
2017/06/07 18:52:31 packer: 2017/06/07 18:52:31 Sending char 't', code 116, 
shift false
2017/06/07 18:52:32 packer: 2017/06/07 18:52:32 Sending char 'p', code 112, 
shift false
2017/06/07 18:52:32 packer: 2017/06/07 18:52:32 Sending char ':', code 58, 
shift true
2017/06/07 18:52:32 packer: 2017/06/07 18:52:32 Sending char '/', code 47, 
shift false
2017/06/07 18:52:33 packer: 2017/06/07 18:52:33 Sending char '/', code 47, 
shift false
2017/06/07 18:52:33 packer: 2017/06/07 18:52:33 Sending char '1', code 49, 
shift false
2017/06/07 18:52:33 packer: 2017/06/07 18:52:33 Sending char '7', code 55, 
shift false
2017/06/07 18:52:33 packer: 2017/06/07 18:52:33 Sending char '2', code 50, 
shift false
2017/06/07 18:52:34 packer: 2017/06/07 18:52:34 Sending char '.', code 46, 
shift false
2017/06/07 18:52:34 packer: 2017/06/07 18:52:34 Sending char '1', code 49, 
shift false
2017/06/07 18:52:34 packer: 2017/06/07 18:52:34 Sending char '6', code 54, 
shift false
2017/06/07 18:52:35 packer: 2017/06/07 18:52:35 Sending char '.', code 46, 
shift false
2017/06/07 18:52:35 packer: 2017/06/07 18:52:35 Sending char '2', code 50, 
shift false
2017/06/07 18:52:35 packer: 2017/06/07 18:52:35 Sending char '1', code 49, 
shift false
2017/06/07 18:52:36 packer: 2017/06/07 18:52:36 Sending char '.', code 46, 
shift false
2017/06/07 18:52:36 packer: 2017/06/07 18:52:36 Sending char '8', code 56, 
shift false
2017/06/07 18:52:36 packer: 2017/06/07 18:52:36 Sending char '6', code 54, 
shift false
2017/06/07 18:52:36 packer: 2017/06/07 18:52:36 Sending char '/', code 47, 
shift false
2017/06/07 18:52:37 packer: 2017/06/07 18:52:37 Sending char 'k', code 107, 
shift false
2017/06/07 18:52:37 packer: 2017/06/07 18:52:37 Sending char 's', code 115, 
shift false
2017/06/07 18:52:37 packer: 2017/06/07 18:52:37 Sending char '.', code 46, 
shift false
2017/06/07 18:52:38 packer: 2017/06/07 18:52:38 Sending char 'c', code 99, 
shift false
2017/06/07 18:52:38 packer: 2017/06/07 18:52:38 Sending char 'f', code 102, 
shift false
2017/06/07 18:52:38 packer: 2017/06/07 18:52:38 Sending char 'g', code 103, 
shift false
2017/06/07 18:52:39 packer: 2017/06/07 18:52:39 Special code '<enter>' found, 
replacing with: 65293
2017/06/07 18:52:39 packer: 2017/06/07 18:52:39 Special code '<wait>' found, 
sleeping one second
2017/06/07 18:52:40 ui: ==> qemu: Waiting for SSH to become available...
2017/06/07 18:52:40 packer: 2017/06/07 18:52:40 [INFO] Waiting for SSH, up to 
timeout: 2m0s
==> qemu: Waiting for SSH to become available...
2017/06/07 18:52:40 packer: 2017/06/07 18:52:40 [INFO] Attempting SSH 
connection...
2017/06/07 18:52:40 packer: 2017/06/07 18:52:40 reconnecting to TCP connection 
for SSH
2017/06/07 18:52:40 packer: 2017/06/07 18:52:40 handshaking with SSH
2017/06/07 18:53:03 packer: 2017/06/07 18:53:03 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:53978->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:03 packer: 2017/06/07 18:53:03 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:53978->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:10 packer: 2017/06/07 18:53:10 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:10 packer: 2017/06/07 18:53:10 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:10 packer: 2017/06/07 18:53:10 handshaking with SSH
2017/06/07 18:53:10 packer: 2017/06/07 18:53:10 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:53982->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:10 packer: 2017/06/07 18:53:10 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:53982->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:17 packer: 2017/06/07 18:53:17 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:17 packer: 2017/06/07 18:53:17 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:17 packer: 2017/06/07 18:53:17 handshaking with SSH
2017/06/07 18:53:17 packer: 2017/06/07 18:53:17 handshake error: ssh: handshake 
failed: EOF
2017/06/07 18:53:17 packer: 2017/06/07 18:53:17 [DEBUG] SSH handshake err: ssh: 
handshake failed: EOF
2017/06/07 18:53:24 packer: 2017/06/07 18:53:24 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:24 packer: 2017/06/07 18:53:24 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:24 packer: 2017/06/07 18:53:24 handshaking with SSH
2017/06/07 18:53:24 packer: 2017/06/07 18:53:24 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:53990->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:24 packer: 2017/06/07 18:53:24 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:53990->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:31 packer: 2017/06/07 18:53:31 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:31 packer: 2017/06/07 18:53:31 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:31 packer: 2017/06/07 18:53:31 handshaking with SSH
2017/06/07 18:53:31 packer: 2017/06/07 18:53:31 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:53994->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:31 packer: 2017/06/07 18:53:31 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:53994->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:38 packer: 2017/06/07 18:53:38 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:38 packer: 2017/06/07 18:53:38 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:38 packer: 2017/06/07 18:53:38 handshaking with SSH
2017/06/07 18:53:38 packer: 2017/06/07 18:53:38 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:53998->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:38 packer: 2017/06/07 18:53:38 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:53998->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:45 packer: 2017/06/07 18:53:45 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:45 packer: 2017/06/07 18:53:45 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:45 packer: 2017/06/07 18:53:45 handshaking with SSH
2017/06/07 18:53:45 packer: 2017/06/07 18:53:45 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54002->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:45 packer: 2017/06/07 18:53:45 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54002->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:52 packer: 2017/06/07 18:53:52 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:52 packer: 2017/06/07 18:53:52 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:52 packer: 2017/06/07 18:53:52 handshaking with SSH
2017/06/07 18:53:52 packer: 2017/06/07 18:53:52 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54006->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:52 packer: 2017/06/07 18:53:52 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54006->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:53:59 packer: 2017/06/07 18:53:59 [INFO] Attempting SSH 
connection...
2017/06/07 18:53:59 packer: 2017/06/07 18:53:59 reconnecting to TCP connection 
for SSH
2017/06/07 18:53:59 packer: 2017/06/07 18:53:59 handshaking with SSH
2017/06/07 18:53:59 packer: 2017/06/07 18:53:59 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54010->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:53:59 packer: 2017/06/07 18:53:59 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54010->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:07 packer: 2017/06/07 18:54:07 [INFO] Attempting SSH 
connection...
2017/06/07 18:54:07 packer: 2017/06/07 18:54:07 reconnecting to TCP connection 
for SSH
2017/06/07 18:54:07 packer: 2017/06/07 18:54:07 handshaking with SSH
2017/06/07 18:54:07 packer: 2017/06/07 18:54:07 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54016->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:54:07 packer: 2017/06/07 18:54:07 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54016->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:14 packer: 2017/06/07 18:54:14 [INFO] Attempting SSH 
connection...
2017/06/07 18:54:14 packer: 2017/06/07 18:54:14 reconnecting to TCP connection 
for SSH
2017/06/07 18:54:14 packer: 2017/06/07 18:54:14 handshaking with SSH
2017/06/07 18:54:14 packer: 2017/06/07 18:54:14 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54020->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:54:14 packer: 2017/06/07 18:54:14 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54020->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:21 packer: 2017/06/07 18:54:21 [INFO] Attempting SSH 
connection...
2017/06/07 18:54:21 packer: 2017/06/07 18:54:21 reconnecting to TCP connection 
for SSH
2017/06/07 18:54:21 packer: 2017/06/07 18:54:21 handshaking with SSH
2017/06/07 18:54:21 packer: 2017/06/07 18:54:21 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54024->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:54:21 packer: 2017/06/07 18:54:21 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54024->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:28 packer: 2017/06/07 18:54:28 [INFO] Attempting SSH 
connection...
2017/06/07 18:54:28 packer: 2017/06/07 18:54:28 reconnecting to TCP connection 
for SSH
2017/06/07 18:54:28 packer: 2017/06/07 18:54:28 handshaking with SSH
2017/06/07 18:54:28 packer: 2017/06/07 18:54:28 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54028->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:54:28 packer: 2017/06/07 18:54:28 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54028->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:35 packer: 2017/06/07 18:54:35 [INFO] Attempting SSH 
connection...
2017/06/07 18:54:35 packer: 2017/06/07 18:54:35 reconnecting to TCP connection 
for SSH
2017/06/07 18:54:35 packer: 2017/06/07 18:54:35 handshaking with SSH
2017/06/07 18:54:35 packer: 2017/06/07 18:54:35 handshake error: ssh: handshake 
failed: read tcp 127.0.0.1:54032->127.0.0.1:2223: read: connection reset by peer
2017/06/07 18:54:35 packer: 2017/06/07 18:54:35 [DEBUG] SSH handshake err: ssh: 
handshake failed: read tcp 127.0.0.1:54032->127.0.0.1:2223: read: connection 
reset by peer
2017/06/07 18:54:40 ui error: ==> qemu: Timeout waiting for SSH.
==> qemu: Timeout waiting for SSH.
2017/06/07 18:54:40 packer: 2017/06/07 18:54:40 [DEBUG] SSH wait cancelled. 
Exiting loop.
2017/06/07 18:54:40 ui: ==> qemu: Deleting output directory...
==> qemu: Deleting output directory...
2017/06/07 18:54:40 ui error: Build 'qemu' errored: Timeout waiting for SSH.
2017/06/07 18:54:40 Builds completed. Waiting on interrupt barrier...
2017/06/07 18:54:40 machine readable: error-count []string{"1"}
2017/06/07 18:54:40 ui error: 
==> Some builds didn't complete successfully and had errors:
2017/06/07 18:54:40 machine readable: qemu,error []string{"Timeout waiting for 
SSH."}
2017/06/07 18:54:40 ui error: --> qemu: Timeout waiting for SSH.
Build 'qemu' errored: Timeout waiting for SSH.

==> Some builds didn't complete successfully and had errors:
--> qemu: Timeout waiting for SSH.
2017/06/07 18:54:40 ui: 
==> Builds finished but no artifacts were created.
2017/06/07 18:54:40 waiting for all plugin processes to complete...

==> Builds finished but no artifacts were created.
2017/06/07 18:54:40 /usr/local/bin/packer: plugin process exited

i can not find any method to modify this problem. please help me. thanks

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