Hi all,

I use the below playbook to add known hosts:

============================================================
- name: demo
  hosts: 10.223.0.51
  remote_user: root
  tasks:
    - name: fetch
      fetch: src=/etc/ssh/ssh_host_rsa_key.pub dest=/tmp/keys
             fail_on_missing=yes validate_checksum=yes
- name: demo
  hosts: 10.223.0.52
  remote_user: root
  tasks:
    - name: known_hosts
      known_hosts: path="/home/xiaoliang/.ssh/known_hosts" host="sun1-db-1" 
state=present
                   key="{{ lookup('file', 
'/tmp/keys/10.223.0.51/etc/ssh/ssh_host_rsa_key.pub') }}"

============================================================

============================================================
$ ansible-playbook  -i ../../inventory/hosts demo.yml -vvvv

PLAY [demo] 
******************************************************************* 

TASK: [fetch] 
***************************************************************** 
<10.223.0.51> ESTABLISH CONNECTION FOR USER: root on PORT 22 TO 10.223.0.51
<10.223.0.51> EXEC /bin/sh -c 'rc=flag; [ -r /etc/ssh/ssh_host_rsa_key.pub 
] || rc=2; [ -f /etc/ssh/ssh_host_rsa_key.pub ] || rc=1; [ -d 
/etc/ssh/ssh_host_rsa_key.pub ] && rc=3; python -V 2>/dev/null || rc=4; [ 
x"$rc" != "xflag" ] && echo "${rc} "/etc/ssh/ssh_host_rsa_key.pub && exit 
0; (python -c '"'"'import hashlib; BLOCKSIZE = 65536; hasher = 
hashlib.sha1(); afile = open("'"'"'/etc/ssh/ssh_host_rsa_key.pub'"'"'", 
"rb") buf = afile.read(BLOCKSIZE) while len(buf) > 0: hasher.update(buf) 
buf = afile.read(BLOCKSIZE) afile.close() print(hasher.hexdigest())'"'"' 
2>/dev/null) || (python -c '"'"'import sha; BLOCKSIZE = 65536; hasher = 
sha.sha(); afile = open("'"'"'/etc/ssh/ssh_host_rsa_key.pub'"'"'", "rb") 
buf = afile.read(BLOCKSIZE) while len(buf) > 0: hasher.update(buf) buf = 
afile.read(BLOCKSIZE) afile.close() print(hasher.hexdigest())'"'"' 
2>/dev/null) || (echo '"'"'0 '"'"'/etc/ssh/ssh_host_rsa_key.pub)'
ok: [10.223.0.51] => {"changed": false, "checksum": 
"312b6e08531e50f6baa21bf87f0dd8adbaad0c0d", "dest": 
"/tmp/keys/10.223.0.51/etc/ssh/ssh_host_rsa_key.pub", "file": 
"/etc/ssh/ssh_host_rsa_key.pub", "md5sum": 
"cb9f17d1febefd7c66fc79967606d272"}

PLAY [demo] 
******************************************************************* 

TASK: [known_hosts] 
*********************************************************** 
<10.223.0.52> ESTABLISH CONNECTION FOR USER: root on PORT 22 TO 10.223.0.52
<10.223.0.52> REMOTE_MODULE known_hosts 
path="/home/xiaoliang/.ssh/known_hosts" host="sun1-db-1" state=present 
key="ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAQEAtqGtO6VLYU3kWIWoiKKg8rgEQvEB/wHP1aZEK95kQ1yekDIK8Vfj4VQ3+pKqwTirwSF9ODeZR1VaC+K4b6Oke9bJ/0h5bXiRzzvmD/wu+c6uEtjtMdNYzQnLu4UNCCh1Fa6Pktm2Lz9xSxTcFyIncxgFSxqabf12OVYWsYaj7BwO6Wgs/pYoJjDv+IgJpUwvsPhJkX2s/Ak/U4JwnuaxXB/wufF/eFbEnTUbTv7o7KpHqX50Ok/daN05AVcC/oYPf79wOaeBsPMnTNisqjYJNSgS1EpTw1ZNxqwiRUpcyx8SQ/uI1caA06Q8g7RcNmLWiEM0t5lx2LjScX4ztrIYxQ=="
<10.223.0.52> EXEC /bin/sh -c 'mkdir -p 
$HOME/.ansible/tmp/ansible-tmp-1432862043.76-101243566006070 && echo 
$HOME/.ansible/tmp/ansible-tmp-1432862043.76-101243566006070'
<10.223.0.52> PUT /tmp/tmp54Yy4J TO 
/root/.ansible/tmp/ansible-tmp-1432862043.76-101243566006070/known_hosts
<10.223.0.52> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 
/usr/bin/python 
/root/.ansible/tmp/ansible-tmp-1432862043.76-101243566006070/known_hosts; 
rm -rf /root/.ansible/tmp/ansible-tmp-1432862043.76-101243566006070/ 
>/dev/null 2>&1'
failed: [10.223.0.52] => {"cmd": "/usr/bin/ssh-keygen -F sun1-db-1 -f 
/tmp/tmpxxoJ6Q", "failed": true, "rc": 1}
stderr: line 1 invalid key: ssh-rsa...
/tmp/tmpxxoJ6Q is not a valid known_hosts file.

msg: line 1 invalid key: ssh-rsa...
/tmp/tmpxxoJ6Q is not a valid known_hosts file.

FATAL: all hosts have already failed -- aborting

PLAY RECAP 
******************************************************************** 
           to retry, use: --limit @/home/xiaoliang/demo.retry

10.223.0.51                : ok=1    changed=0    unreachable=0    
failed=0   
10.223.0.52                : ok=0    changed=0    unreachable=0    
failed=1  
============================================================


will anyone please help to look at this? or point me to the right direction?

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