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---
module: known_hosts
short_description: Add or remove a host from the C(known_hosts) file
description:
- The C(known_hosts) module lets you add or remove a host keys from the C(known_hosts) file.
- Starting at Ansible 2.2, multiple entries per host are allowed, but only one for each key type supported by ssh.
This is useful if you're going to want to use the M(git) module over ssh, for example.
- If you have a very large number of host keys to manage, you will find the M(template) module more useful.
version_added: "1.9"
options:
name:
aliases: [ 'host' ]
description:
- The host to add or remove (must match a host specified in key). It will be converted to lowercase so that ssh-keygen can find it.
- Must match with <hostname> or <ip> present in key attribute.
required: true
key:
description:
- The SSH public host key, as a string (required if state=present, optional when state=absent, in which case all keys for the host are removed).
The key must be in the right format for ssh (see sshd(8), section "SSH_KNOWN_HOSTS FILE FORMAT").
Specifically, the key should not match the format that is found in an SSH pubkey file, but should rather have the hostname prepended to a
line that includes the pubkey, the same way that it would appear in the known_hosts file. The value prepended to the line must also match
the value of the name parameter.
Should be of format `<hostname[,IP]> ssh-rsa <pubkey>`
path:
description:
- The known_hosts file to edit
default: "(homedir)+/.ssh/known_hosts"
hash_host:
description:
- Hash the hostname in the known_hosts file
type: bool
default: 'no'
version_added: "2.3"
state:
description:
- I(present) to add the host key, I(absent) to remove it.
choices: [ "present", "absent" ]
default: present
requirements: [ ]
author: "Matthew Vernon (@mcv21)"
s�
- name: tell the host about our servers it might want to ssh to
known_hosts:
path: /etc/ssh/ssh_known_hosts
name: foo.com.invalid
key: "{{ lookup('file', 'pubkeys/foo.com.invalid') }}"
- name: Another way to call known_hosts
known_hosts:
name: host1.example.com # or 10.9.8.77
key: host1.example.com,10.9.8.77 ssh-rsa ASDeararAIUHI324324 # some key gibberish
path: /etc/ssh/ssh_known_hosts
state: present
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sshkeygen is the path to ssh-keygen, found earlier with get_bin_path
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Looks up host and keytype in the known_hosts file path; if it's there, looks to see
if one of those entries matches key. Returns:
found (Boolean): is host found in path?
replace_or_add (Boolean): is the key in path different to that supplied by user?
found_line (int or None): the line where a key of the same type was found
if found=False, then replace is always False.
sshkeygen is the path to ssh-keygen, found earlier with get_bin_path
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Transform a key, either taken from a known_host file or provided by the
user, into a normalized form.
The host part (which might include multiple hostnames or be hashed) gets
replaced by the provided host. Also, any spurious information gets removed
from the end (like the username@host tag usually present in hostkeys, but
absent in known_hosts files)
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