Ansible Modules¶

apt¶

Manages apt-packages (such as for Debian/Ubuntu).

pkg:

• A package name or package specifier with version, like foo, or foo=1.0 to install a specific version of the foo package.

state:

• Can be either ‘installed’, ‘removed’, or ‘latest’. The default is ‘installed’. (In 0.4 and later, the aliases ‘absent’ and ‘present’ can also be used. They correspond with ‘removed’ and ‘installed’)

update-cache:

• Whether the apt cache must be updated prior to operation. Optional, and can be ‘yes’, or ‘no’. The default is ‘no’. This can be done as the part of a package operation or as a seperate step.

purge:

• Will force purge of configuration file for when ensure is set to ‘removed’. Defaults to ‘no’.

default-release:

• Corresponds to the -t option for apt, and sets pin priorities

Example action from Ansible Playbooks:

apt pkg=foo update-cache=yes
apt pkg=foo state=removed
apt pkg=foo state=installed
apt pkg=foo=1.00 state=installed
apt pkg=nginx state=latest default-release=squeeze-backports update-cache=yes

command¶

The command module takes the command name followed by a list of arguments, space delimited.

If you want to run a command through the shell (say you are using ‘<’, ‘>’, ‘|’, etc), you actually want the ‘shell’ module instead. The ‘command’ module is much more secure as it’s not affected by the user’s environment.

The given command will be executed on all selected nodes. It will not be processed through the shell, so variables like “$HOME” and operations like “<”, “>”, “|”, and “&” will not work. As such, all paths to commands must be fully qualified.

This module does not support change hooks and returns the return code from the program as well as timing information about how long the command was running.

Example action from Ansible Playbooks:

command /sbin/shutdown -t now

If you only want to run a command if a certain file does not exist, you can do the following:

command /usr/bin/make_database.sh arg1 arg2 creates=/path/to/database

The creates= option will not be passed to the executable.

copy¶

The copy module moves a file on the local box to remote locations. In addition to the options listed below, the arguments available to the file module can also be passed to the copy module.

src:

• Local path to a file to copy to the remote server. This can be an absolute or relative path.

dest:

• Remote absolute path where the file should end up.

This module also returns md5sum information about the resultant file.

Example action from Ansible Playbooks:

copy src=/srv/myfiles/foo.conf dest=/etc/foo.conf owner=foo group=foo mode=0644

facter¶

Runs the discovery program ‘facter’ on the remote system, returning JSON data that can be useful for inventory purposes.

Requires that ‘facter’ and ‘ruby-json’ be installed on the remote end.

This module is informative only - it takes no parameters & does not support change hooks, nor does it make any changes on the system. Playbooks do not actually use this module, they use the setup module behind the scenes.

fetch¶

This module works like ‘copy’, but in reverse. It is used for fetching files from remote machines and storing them locally in a file tree, organized by hostname.

src:

• The file on the remote system to fetch. This needs to be a file, not a directory. Recursive fetching may be supported later.

dest:

• A directory to save the file into. For example, if the ‘dest’ directory is ‘/foo’, a src file named ‘/tmp/bar’ on host ‘host.example.com’, would be saved into ‘/foo/host.example.com/tmp/bar’ (in Ansible 0.0.3 and later).

The fetch module is a useful way to gather log files from remote systems. If you require fetching multiple files from remote systems, you may wish to execute a tar command and then fetch the tarball.

Example:

fetch src=/var/log/messages dest=/home/logtree

file¶

Sets attributes of files, symlinks, and directories, or removes files/symlinks/directories. All parameters available to the file module are also available when running the copy or template modules.

dest:

• alias for ‘path’. Sets an absolute path to a file on the filesystem when used with ‘state=file’. When used with ‘state=link’, sets the destination to create a symbolic link defined by ‘src’ key.

state:

• either ‘file’, ‘link’, ‘directory’, or ‘absent’. The default is ‘file’. If ‘directory’, the directory and all immediate subdirectories will be created if they do not exist. If ‘file’, the file will NOT be created if it does not exist, specify copy or template for the module name instead if you need to put content at the specified location. If ‘link’, the symbolic link will be created or changed. If ‘absent’, directories will be recursively deleted, and files or symlinks will be unlinked.

mode:

• the mode the file or directory should be, such as 644, as would be given to chmod. English modes like “g+x” are not yet supported.

owner:

• name of user that should own the file or directory, as would be given to chown

group:

• name of group that should own the file or directory, as would be given to chgrp

src:

• path of the file to link to (applies only to ‘link’ state)

seuser:

• ‘user’ part of SELinux file context. Will default to what is provided by system policy, if available. Only used on systems with SELinux present. If you specify ‘_default’, it will use the ‘user’ portion of default context from the policy if available.

serole:

• ‘role’ part of SELinux file context. Will default to what is provided by system policy, if available. Only used on systems with SELinux present. If you specify ‘_default’, it will use the ‘role’ portion of default context from the policy if available.

setype:

• ‘type’ part of SELinux file context. Will default to what is provided by system policy, if available. Only used on systems with SELinux present. If you specify ‘_default’, it will use the ‘type’ portion of default context from the policy if available.

selevel:

• ‘level’ part of SELinux file context. This is the MLS and MCS attribute of the file context, also sometimes known as the ‘range’. It defaults to ‘s0’. Only used only used on hosts with SELinux present. If you specify ‘_default’, it will use the ‘level’ portion of default context from the policy if available.

context:

• accepts only ‘default’ as value. This will restore a file’s selinux context to the default context in the policy. Does nothing if no default is available. Only used on hosts with SELinux present.

Example action from Ansible Playbooks:

file path=/etc/foo.conf owner=foo group=foo mode=0644
file path=/some/path owner=foo group=foo state=directory
file path=/path/to/delete state=absent
file src=/file/to/link/to dest=/path/to/symlink owner=foo group=foo state=link
file path=/some/path state=directory setype=httpd_sys_content_t
file path=/some/path state=directory context=default

git¶

Deploys software (or files) from git checkouts.

repo:

• git, ssh, or http protocol address of the git repo to checkout.

dest:

• Where to check it out, an absolute directory path.

version:

• What version to check out – either the git SHA, the literal string HEAD, or a tag name.

branch:

• (new in 0.4) Which branch name to checkout. Defaults to ‘master’.

Example action from Ansible Playbooks:

git repo=git://foosball.example.org/path/to/repo.git dest=/srv/checkout version=release-0.22

group¶

Adds or removes groups.

name:

• name of the group

gid:

• optional gid to set for the group

state:

• either ‘absent’, or ‘present’. ‘present’ is the default.

system:

• (new in 0.4) Indicates the group (when being created), should be a system group. This does not allow changing groups from and to system groups. Value is ‘yes’ or ‘no’, default is ‘no’.

To control members of the group, see the users resource.

Example action from Ansible Playbooks:

group name=somegroup state=present

ohai¶

Similar to the facter module, this returns JSON inventory data. Ohai data is a bit more verbose and nested than facter.

Requires that ‘ohai’ be installed on the remote end.

This module is information only - it takes no parameters & does not support change hooks, nor does it make any changes on the system.

Playbooks should not call the ohai module, playbooks call the setup module behind the scenes instead.

ping¶

A trivial test module, this module always returns the integer 1 on successful contact.

This module does not support change hooks and is informative only - it takes no parameters & does not support change hooks, nor does it make any changes on the system.

raw¶

Executes a low-down and dirty SSH command, not going through the module subsystem. This module is new in Ansible 0.4.

This is useful and should only be done in two cases. The first case is installing python-simplejson on older (python 2.4 and before) hosts that need it as a dependency to run modules, since nearly all core modules require it. Another is speaking to any devices such as routers that do not have any Python installed. In any other case, using the ‘shell’ or ‘command’ module is much more appropriate.

Arguments given to ‘raw’ are run directly through the configured remote shell and only output is returned. There is no error detection or change handler support for this module.

Example from /usr/bin/ansible to bootstrap a legacy python 2.4 host:

ansible newhost.example.com raw -a “yum install python-simplejson”

service¶

Controls services on remote machines.

state:

• Values are started, stopped, or restarted. Started/stopped are idempotent actions that will not run commands unless necessary. restarted will always bounce the service.

enabled:

• (new in 0.4) Whether the service should start on boot. Either ‘yes’ or ‘no’. Uses chkconfig or updates-rc.d as appropriate.

list:

• (new in 0.4) When used with the value ‘status’, returns the status of the service along with other results. This is primarily useful for /usr/bin/ansible, and not meaningful for playbooks.

name:

• The name of the service.

Example action from Ansible Playbooks:

service name=httpd state=started
service name=httpd state=stopped
service name=httpd state=restarted

setup¶

Writes a JSON file containing key/value data, for use in templating. Call this once before using the template module. Playbooks will execute this module automatically as the first step in each play using the variables section, so it is unnecessary to make explicit calls to setup within a playbook.

Ansible provides many ‘facts’ about the system, automatically.

Some of the variables that are supplied are listed below. These in particular are from a VMWare Fusion 4 VM running CentOS 6.2:

"ansible_architecture": "x86_64",
"ansible_distribution": "CentOS",
"ansible_distribution_release": "Final",
"ansible_distribution_version": "6.2",
"ansible_eth0": {
    "ipv4": {
        "address": "REDACTED",
        "netmask": "255.255.255.0"
    },
    "ipv6": [
        {
            "address": "REDACTED",
            "prefix": "64",
            "scope": "link"
        }
    ],
    "macaddress": "REDACTED"
},
"ansible_form_factor": "Other",
"ansible_fqdn": "localhost.localdomain",
"ansible_hostname": "localhost",
"ansible_interfaces": [
    "lo",
    "eth0"
],
"ansible_kernel": "2.6.32-220.2.1.el6.x86_64",
"ansible_lo": {
    "ipv4": {
        "address": "127.0.0.1",
        "netmask": "255.0.0.0"
    },
    "ipv6": [
        {
            "address": "::1",
            "prefix": "128",
            "scope": "host"
        }
    ],
"ansible_machine": "x86_64",
"ansible_memfree_mb": 89,
"ansible_memtotal_mb": 993,
"ansible_processor": [
    "Intel(R) Core(TM) i7-2677M CPU @ 1.80GHz"
],
"ansible_processor_cores": "NA",
"ansible_processor_count": 1,
"ansible_product_name": "VMware Virtual Platform",
"ansible_product_serial": "REDACTED",
"ansible_product_uuid": "REDACTED",
"ansible_product_version": "None",
"ansible_python_version": "2.6.6",
"ansible_product_version": "None",
"ansible_python_version": "2.6.6",
"ansible_ssh_host_key_dsa_public": REDACTED",
"ansible_ssh_host_key_rsa_public": "REDACTED",
"ansible_swapfree_mb": 1822,
"ansible_swaptotal_mb": 2015,
"ansible_system": "Linux",
"ansible_system_vendor": "VMware, Inc.",
"ansible_virtualization_role": "None",
"ansible_virtualization_type": "None",

More ansible facts will be added with successive releases.

If facter or ohai are installed, variables from these programs will also be snapshotted into the JSON file for usage in templating. These variables are prefixed with facter_ and ohai_ so it’s easy to tell their source.

All variables are bubbled up to the caller. Using the ansible facts and choosing to not install facter and ohai means you can avoid ruby-dependencies on your remote systems.

variablename:

• Arbitrary variable names, which must be a mix of alphanumeric characters and underscores, can also be defined. Setting a variable creates a key=value pair in the JSON file for use in templating.

Example action from Ansible Playbooks:

vars:
    ntpserver: 'ntp.example.com'
    xyz: 1234

Example action from /usr/bin/ansible:

ansible all -m setup -a "ntpserver=ntp.example.com xyz=1234"

shell¶

The shell module takes the command name followed by a list of arguments, space delimited. It is almost exactly like the command module but runs the command through the user’s configured shell on the remote node.

The given command will be executed on all selected nodes.

If you want to execute a command securely and predicably, it may be better to use the ‘command’ module instead. Best practices when writing playbooks will follow the trend of using ‘command’ unless ‘shell’ is explicitly required. When running ad-hoc commands, use your best judgement.

This module does not support change hooks and returns the return code from the program as well as timing information about how long the command was running.

Example action from a playbook:

shell somescript.sh >> somelog.txt

template¶

Templates a file out to a remote server. Call the setup module prior to usage if you are not running from a playbook. In addition to the options listed below, the arguments available to the file and copy modules can also be passed to the template module.

src:

• Path of a Jinja2 formatted template on the local server. This can be a relative or absolute path.

dest:

• Location to render the template on the remote server

This module also returns md5sum information about the resultant file.

Example action from a playbook:

template src=/srv/mytemplates/foo.j2 dest=/etc/foo.conf owner=foo group=foo mode=0644

user¶

Creates user accounts, manipulates existing user accounts, and removes user accounts.

name:

• Name of the user to create, remove, or edit

comment:

• Optionally sets the description of the user

uid:

• optional uid to set for the user

group:

• Optionally sets the user’s primary group, takes a group name

groups:

• Put the user in the specified groups, takes comma delimited group names

append:

• If true, will only add additional groups to the user listed in ‘groups’, rather than making the user only be in those specified groups

shell:

• Optionally sets the user’s shell

createhome:

• Whether to create the user’s home directory. Takes ‘yes’, or ‘no’. The default is ‘yes’.

password:

• Sets the user’s password to this crypted value. Pass in a result from crypt. See the users example in the github examples directory for what this looks like in a playbook.

state:

• Defaults to ‘present’. When ‘absent’, the user account will be removed if present. Optionally additional removal behaviors can be set with the ‘force’ or ‘remove’ parameter values (see below).

system:

• (new in 0.4) Indicates the user (when being created), should be a system account. This does not allow changing users from and to system accounts. Value is ‘yes’ or ‘no’, default is ‘no’.

force:

• When used with a state of ‘absent’, the behavior denoted in the ‘userdel’ manpage for --force is also used when removing the user. Value is ‘yes’ or ‘no’, default is ‘no’.

remove:

• When used with a state of ‘absent’, the behavior denoted in the ‘userdel’ manpage for --remove is also used when removing the user. Value is ‘yes’ or ‘no’, default is ‘no’.

Example action from Ansible Playbooks:

user name=mdehaan comment=awesome passwd=awWxVV.JvmdHw createhome=yes
user name=mdehaan groups=wheel,skynet
user name=mdehaan state=absent force=yes

virt¶

Manages virtual machines supported by libvirt. Requires that libvirt be installed on the managed machine.

guest:

• The name of the guest VM being managed

state

• Desired state of the VM. Either running, shutdown, destroyed, or undefined. Note that there may be some lag for state requests like ‘shutdown’, and these states only refer to the virtual machine states. After starting a guest, the guest OS may not be immediately accessible.

command:

• In addition to state management, various non-idempotent commands are available for API and script usage (but don’t make much sense in a playbook). These mostly return information, though some also affect state. See examples below.

Example action from Ansible Playbooks:

virt guest=alpha state=running
virt guest=alpha state=shutdown
virt guest=alpha state=destroyed
virt guest=alpha state=undefined

Example guest management commands from /usr/bin/ansible:

ansible host -m virt -a "guest=foo command=status"
ansible host -m virt -a "guest=foo command=pause"
ansible host -m virt -a "guest=foo command=unpause"
ansible host -m virt -a "guest=foo command=get_xml"
ansible host -m virt -a "guest=foo command=autostart"

Example host (hypervisor) management commands from /usr/bin/ansible:

ansible host -m virt -a "command=freemem"
ansible host -m virt -a "command=list_vms"
ansible host -m virt -a "command=info"
ansible host -m virt -a "command=nodeinfo"
ansible host -m virt -a "command=virttype"

yum¶

Will install, upgrade, remove, and list packages with the yum package manager.

pkg:

• A package name or package specifier with version, like name-1.0

state:

• Can be either ‘installed’, ‘latest’, or ‘removed’. The default is ‘installed’. (In 0.4 and later, the aliases ‘absent’ and ‘present’ can also be used. They correspond with ‘removed’ and ‘installed’)

list:

• When ‘list’ is supplied instead of ‘state’, the yum module can list various configuration attributes. Values include ‘installed’, ‘updates’, ‘available’, ‘repos’, or any package specifier. (This is more intended for use with /usr/bin/ansible or the API, not playbooks.)

Example action from Ansible Playbooks:

yum pkg=httpd state=latest
yum pkg=httpd state=removed
yum pkg=httpd state=installed

Writing your own modules¶

See Module Development.