Ubuntu – Juju cannot deploy services with MAAS

I would like deploy one or more charms with juju on MAAS environments (without OpenStack). The environment of the MAAS Controller is Ubuntu 12.10 with 2 NICs. One of the NIC is connected to a external DHCP and the other is holding by the MAAS-dhcp and is connected to a switch with 2 client servers (Ubuntu 12.04 LTS). The settings are as follows

$ sudo vim /etc/network/interfaces

auto em1

iface em1 inet static

address [out-ip]

netmask [out-netmask]

gateway [out-gateway]

dns-nameservers [out-dns]

auto em2

iface em2 inet static

address [inner ip]

network [inner network]

netmask [inner netmask]

broadcast [inner broadcast address]

$sudo vim /etc/sysctl.conf

uncomment net.ipv4.ip_forward=1

$ sudo vim /etc/rc.local

/sbin/iptables -P FORWARD ACCEPT

/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

$ sudo iptables -P FORWARD ACCEPT

$ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

$ sudo /etc/init.d/networking restart

$ sudo dpkg-reconfigure maas-region-controller

[inner ip]

$ sudo dpkg-reconfigure maas-cluster-controller

http://[inner ip]:80/MAAS

$ sudo vim /etc/maas/ephmeralss

set ARCHES="amd64"

$ sudo maas createsuperuser

$ sudo maas-impoart-pxe-files

open web UI (http://[inner ip]/MAAS) & press setting button & set Cluster controllers

$ sudo vim /var/share/preseeds/preseed-master …

open computer to let clients set to ready status ( DO NOT PRESS 'START NODE' BUTTON )

check if nodes are all in READY status

MAAS clients are all in ready status:

setting juju environments.yaml

juju bootstrap ( check if one of the node -> allocated to *)

open the allocated Server to PXE boot and the setup a Ubuntu

after the installation

juju status

machines:
  0:
    agent-state: running
    dns-name: node-4487fc70b037
    instance-id: /MAAS/api/1.0/nodes/node-xxx
    instance-state: unknown
service{}

When I try to deploy one charm ( for example mysql ), the other client is booted and installed ubuntu. However, after the installation, the charm still wasn't deployed.
and I try:

juju status

machines:
  0:
    agent-state: running
    dns-name: node-4487fc70b037
    instance-id: /MAAS/api/1.0/nodes/node-64248652-6a9b-11e2-9347-842b2b6a17a3/
    instance-state: unknown
  1:
    agent-state: not-started
    dns-name: node-0025b31884f5
    instance-id: /MAAS/api/1.0/nodes/node-011c5b14-6a9d-11e2-9c04-842b2b6a17a3/
    instance-state: unknown
services:
  mysql:
    charm: cs:precise/mysql-15
    relations: {}
    units:
      mysql/0:
        agent-state: pending
        machine: 1
        public-address: null

I also checked /var/log/juju/machine-agent.log of machine 1 ( the non-started machine) and it shows that

2013-01-30 01:19:58,444: twisted@ERROR: Unhandled error in Deferred:
2013-01-30 01:19:58,454: twisted@ERROR: Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1181, in unwindGenerator
    return _inlineCallbacks(None, gen, Deferred())
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1039, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/python2.7/dist-packages/juju/agents/base.py", line 238, in startService
    yield self.connect()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1181, in unwindGenerator
    return _inlineCallbacks(None, gen, Deferred())
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1039, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/python2.7/dist-packages/juju/agents/base.py", line 208, in connect
    self.config["zookeeper_servers"])
  File "/usr/lib/python2.7/dist-packages/txzookeeper/retry.py", line 302, in connect
    return self.client.connect(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/txzookeeper/client.py", line 468, in connect
    self._servers, callback, self._session_timeout)
zookeeper.ZooKeeperException: Could not internally obtain zookeeper handle

I wait for one day and it keeps pending. The machine 1 is also remaining on not-started. I also checked to ssh two clients that they are quite ok. However, I cannot use juju ssh 1 to connect to the client. I really don't know what to do. Please help me.