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< li > < a class = "reference internal" href = "#" > Inventory & Patterns< / a > < ul >
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< li > < a class = "reference internal" href = "#hosts-and-groups" > Hosts and Groups< / a > < / li >
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< li > < a class = "reference internal" href = "#selecting-targets" > Selecting Targets< / a > < / li >
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< li > < a class = "reference internal" href = "#host-variables" > Host Variables< / a > < / li >
< li > < a class = "reference internal" href = "#group-variables" > Group Variables< / a > < / li >
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< li > < a class = "reference internal" href = "#groups-of-groups-and-group-variables" > Groups of Groups, and Group Variables< / a > < / li >
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< li > < a class = "reference internal" href = "#splitting-out-host-and-group-specific-data" > Splitting Out Host and Group Specific Data< / a > < / li >
< li > < a class = "reference internal" href = "#yaml-inventory" > YAML Inventory< / a > < / li >
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< a href = "http://github.com/ansible/ansible" > < img style = "position: absolute; right: 0; border: 0;" src = "http://ansible.github.com/github.png" alt = "Fork me on GitHub" > < / a >
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< a href = "http://ansible.github.com" > < img src = "http://ansible.github.com/ansible-logo.png" alt = "Ansible" / > < / a > < br / >
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< br / >
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< div class = "section" id = "inventory-patterns" >
< span id = "patterns" > < / span > < h1 > Inventory & Patterns< a class = "headerlink" href = "#inventory-patterns" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< p > Ansible works against multiple systems in your infrastructure at the
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same time. It does this by selecting portions of systems listed in
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Ansible’ s inventory file, which defaults to /etc/ansible/hosts.< / p >
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< div class = "section" id = "hosts-and-groups" >
< span id = "inventoryformat" > < / span > < h2 > Hosts and Groups< a class = "headerlink" href = "#hosts-and-groups" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > The format for /etc/ansible/hosts is an INI format and looks like this:< / p >
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< div class = "highlight-python" > < div class = "highlight" > < pre > < span class = "n" > mail< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< span class = "p" > [< / span > < span class = "n" > webservers< / span > < span class = "p" > ]< / span >
< span class = "n" > foo< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< span class = "n" > bar< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< span class = "p" > [< / span > < span class = "n" > dbservers< / span > < span class = "p" > ]< / span >
< span class = "n" > one< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< span class = "n" > two< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< span class = "n" > three< / span > < span class = "o" > .< / span > < span class = "n" > example< / span > < span class = "o" > .< / span > < span class = "n" > com< / span >
< / pre > < / div >
< / div >
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< p > The things in brackets are group names. You don’ t have to have them,
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but they are useful.< / p >
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< p > If you have hosts that run on non-standard SSH ports you can put the port number
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after the hostname with a colon.< / p >
< blockquote >
< div > four.example.com:5309< / div > < / blockquote >
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< / div >
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< div class = "section" id = "selecting-targets" >
< h2 > Selecting Targets< a class = "headerlink" href = "#selecting-targets" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > We’ ll go over how to use the command line in < a class = "reference internal" href = "examples.html" > < em > Command Line< / em > < / a > section, however, basically it looks like this:< / p >
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< div class = "highlight-python" > < pre > ansible < pattern_goes_here> -m < module_name> -a < arguments> < / pre >
< / div >
< p > Such as:< / p >
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< div class = "highlight-python" > < pre > ansible webservers -m service -a "name=httpd state=restarted"< / pre >
< / div >
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< p > Within < a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > , these patterns can be used for even greater purposes.< / p >
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< p > Anyway, to use Ansible, you’ ll first need to know how to tell Ansible which hosts in your inventory file to talk to.
This is done by designating particular host names or groups of hosts.< / p >
< p > The following patterns target all hosts in the inventory file:< / p >
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< div class = "highlight-python" > < pre > all
*< / pre >
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< / div >
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< p > Basically ‘ all’ is an alias for ‘ *’ . It is also possible to address a specific host or hosts:< / p >
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< div class = "highlight-python" > < pre > one.example.com
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one.example.com:two.example.com
192.168.1.50
192.168.1.*< / pre >
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< / div >
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< p > The following patterns address one or more groups, which are denoted
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with the aforementioned bracket headers in the inventory file:< / p >
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< div class = "highlight-python" > < pre > webservers
webservers:dbservers< / pre >
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< / div >
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< p > You can exclude groups as well, for instance, all webservers not in Phoenix:< / p >
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< div class = "highlight-python" > < pre > webservers:!phoenix< / pre >
< / div >
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< p > Individual host names (or IPs), but not groups, can also be referenced using
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wildcards:< / p >
< div class = "highlight-python" > < pre > *.example.com
*.com< / pre >
< / div >
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< p > It’ s also ok to mix wildcard patterns and groups at the same time:< / p >
< div class = "highlight-python" > < pre > one*.com:dbservers< / pre >
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< / div >
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< p > Easy enough. See < a class = "reference internal" href = "examples.html" > < em > Command Line< / em > < / a > and then < a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > for how to do things to selected hosts.< / p >
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< / div >
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< div class = "section" id = "host-variables" >
< h2 > Host Variables< a class = "headerlink" href = "#host-variables" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > It is easy to assign variables to hosts that will be used later in playbooks:< / p >
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< div class = "highlight-python" > < pre > [atlanta]
host1 http_port=80 maxRequestsPerChild=808
host2 http_port=303 maxRequestsPerChild=909< / pre >
< / div >
< / div >
< div class = "section" id = "group-variables" >
< h2 > Group Variables< a class = "headerlink" href = "#group-variables" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > Variables can also be applied to an entire group at once:< / p >
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< div class = "highlight-python" > < pre > [atlanta]
host1
host2
[atlanta:vars]
ntp_server=ntp.atlanta.example.com
proxy=proxy.atlanta.example.com< / pre >
< / div >
< / div >
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< div class = "section" id = "groups-of-groups-and-group-variables" >
< h2 > Groups of Groups, and Group Variables< a class = "headerlink" href = "#groups-of-groups-and-group-variables" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > It is also possible to make groups of groups and assign
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variables to groups. These variables can be used by /usr/bin/ansible-playbook, but not
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/usr/bin/ansible:< / p >
< div class = "highlight-python" > < pre > [atlanta]
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host1
host2
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[raleigh]
host2
host3
[southeast:children]
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atlanta
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raleigh
[southeast:vars]
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some_server=foo.southeast.example.com
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halon_system_timeout=30
self_destruct_countdown=60
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escape_pods=2
[usa:children]
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southeast
northeast
southwest
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southeast< / pre >
< / div >
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< p > If you need to store lists or hash data, or prefer to keep host and group specific variables
seperate from the inventory file, see the next section.< / p >
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< / div >
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< div class = "section" id = "splitting-out-host-and-group-specific-data" >
< h2 > Splitting Out Host and Group Specific Data< a class = "headerlink" href = "#splitting-out-host-and-group-specific-data" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > In Ansible 0.6 and later, in addition to the storing variables directly in the INI file, host and
group variables can be stored in individual files relative to the inventory file. These
variable files are in YAML format.< / p >
< p > Assuming the inventory file path is:< / p >
< div class = "highlight-python" > < pre > /etc/ansible/hosts< / pre >
< / div >
< p > If the host is named ‘ foosball’ , and in groups ‘ raleigh’ and ‘ webservers’ , variables
in YAML files at the following locations will be made available to the host:< / p >
< div class = "highlight-python" > < pre > /etc/ansible/group_vars/raleigh
/etc/ansible/group_vars/webservers
/etc/ansible/host_vars/foosball< / pre >
< / div >
< p > For instance, suppose you have hosts grouped by datacenter, and each datacenter
uses some different servers. The data in the groupfile ‘ /etc/ansible/group_vars/raleigh’ for
the ‘ raleigh’ group might look like:< / p >
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< div class = "highlight-python" > < pre > ---
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ntp_server: acme.example.org
database_server: storage.example.org< / pre >
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< / div >
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< p > It is ok if these files do not exist, this is an optional feature.< / p >
< p > Tip: Keeping your inventory file and variables in a git repo (or other version control)
is an excellent way to track changes to your inventory and host variables.< / p >
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< p > Tip: If you ever have two python interpreters on a system, set a variable called ‘ ansible_python_interpreter’ to
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the Python interpreter path you would like to use.< / p >
< / div >
< div class = "section" id = "yaml-inventory" >
< h2 > YAML Inventory< a class = "headerlink" href = "#yaml-inventory" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Ansible’ s YAML inventory format is deprecated and will be removed in Ansible 0.7. Ansible 0.6 includes
a < a class = "reference external" href = "https://github.com/ansible/ansible/blob/devel/examples/scripts/yaml_to_ini.py" > conversion script< / a > .< / p >
< p > Usage:< / p >
< div class = "highlight-python" > < div class = "highlight" > < pre > < span class = "n" > yaml_to_ini< / span > < span class = "o" > .< / span > < span class = "n" > py< / span > < span class = "o" > /< / span > < span class = "n" > etc< / span > < span class = "o" > /< / span > < span class = "n" > ansible< / span > < span class = "o" > /< / span > < span class = "n" > hosts< / span >
< / pre > < / div >
< / div >
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< div class = "admonition-see-also admonition seealso" >
< p class = "first admonition-title" > See also< / p >
< dl class = "last docutils" >
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< dt > < a class = "reference internal" href = "examples.html" > < em > Command Line< / em > < / a > < / dt >
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< dd > Examples of basic commands< / dd >
< dt > < a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > < / dt >
< dd > Learning ansible’ s configuration management language< / dd >
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< dt > < a class = "reference external" href = "http://groups.google.com/group/ansible-project" > Mailing List< / a > < / dt >
< dd > Questions? Help? Ideas? Stop by the list on Google Groups< / dd >
< dt > < a class = "reference external" href = "http://irc.freenode.net" > irc.freenode.net< / a > < / dt >
< dd > #ansible IRC chat channel< / dd >
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< form action = "https://www.paypal.com/cgi-bin/webscr" method = "post" >
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< a href = "https://twitter.com/share" class = "twitter-share-button" data-text = "ansible.github.com" > Share On Twitter< / a >
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© Copyright 2012 Michael DeHaan.< br / >
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Last updated on Aug 08, 2012.< br / >
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