Fabric asks for password even though I can SSH using credential
$ fab live pull
[mysite.com] Executing task 'pull'
[mysite.com] run: test -d proj
[mysite.com] run: test -d proj/.git
[mysite.com] run: git pull origin master
...

$ fab staging pull
[dev.mysite.com] Executing task 'pull'
[dev.mysite.com] run: test -d proj
[dev.mysite.com] Login password:

def staging():
    env.hosts = ['dev.mysite.com']
    env.user = 'bamboo'
    env.key_filename = '~/.ssh/id_dsa_bamboo'

$ ssh bamboo@dev.mysite.com -i ~/.ssh/id_dsa_bamboo
Last login: Wed Apr 11 06:24:28 2012 from xxx.xxx.xx.xx
[bamboo@dev ~]$

Host dev.mysite.com
    User bamboo
    IdentityFile ~/.ssh/id_dsa_bamboo
    ForwardAgent yes

ssh.util.log_to_file("paramiko.log", 10)