community.general/docs/man/man5/ansible-playbook.5

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.\"     Title: ansible-modules
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 02/26/2012
.\"    Manual: System administration commands
.\"    Source: Ansible-playbook 0.0.1
.\"  Language: English
.\"
.TH "ANSIBLE\-MODULES" "5" "02/26/2012" "Ansible\-playbook 0\&.0\&.1" "System administration commands"
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.SH "NAME"
ansible-playbook \- format and function of an ansible playbook file
.SH "DESCRIPTION"
.sp
Ansible ships with a ansible\-playbook tool for running playbooks\&. Playbooks can represent frequent tasks, desired system configurations, or deployment processes\&.
.SH "FORMAT"
.sp
Playbooks are currently writeable in YAML\&. Other formats (JSON?) may be supported in the future\&.
.SH "EXAMPLE"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
pattern:
\fI*\fR
hosts:
\fI/etc/ansible/hosts\fR
tasks:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
do:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
configure template & module variables for future template calls
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
setup http_port=80 max_clients=200
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
do:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
write the apache config file
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
template src=/srv/mytemplates/httpd\&.j2 dest=/etc/httpd/conf notify:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
restart apache
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
do
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
ensure apache is running
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
service name=httpd ensure=started handlers:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
do:
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
restart apache
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
service name=httpd ensure=restarted
.RE
.SH "WHAT THE EXAMPLE MEANS"
.sp
Here\(cqs what the above example will do\&.
.sp
For all hosts in /etc/ansible/hosts (one host per line) that are named \fIwebserver\-anything\fR, first write a JSON file into /etc/ansible/setup on each remote system with the values max_clients and http_port\&.
.sp
Next, use a Jinja2 template locally residing at /srv/mytemplates/httpd\&.j2 to write the Apache config file on each host to the path /etc/httpd/conf, using the previous values\&.
.sp
Ensure that apache is running if stopped\&.
.sp
If and only if the config file changed, note that we need to restart apache at the end of the run, otherwise, don\(cqt bother because we already know it is running\&.
.SH "HIGH LEVEL EXPLANATION"
.sp
Playbooks are executed top down and can contain multiple references to patterns\&. For instance, a playbook could do something to all webservers, then do something to all database servers, then do something different to all webservers again\&.
.sp
For each pattern, the tasks in the \fItasks\fR list are executed in order for all hosts in the host file matching the pattern\&.
.sp
For each task, a "do" statement describes what the task is and what ansible module to use to accomplish the task, along with any arguments\&. The first line in the "do" is the name of the task \(em this will appear in any log output\&.
.sp
The second line in each "do" is the module name followed by module arguments\&.
.sp
Most modules accept key=value format arguments\&.
.sp
Handlers are like tasks, but are conditionally executed\&. If a module reports a \fIchange\fR, it can choose to notify a handler by name\&. If notified, it will run only for hosts that changed\&.
.SH "FUTURE BEHAVIOR"
.sp
What the playbook run does with a host when an error is detected is currently being refined and is subject to change\&.
.SH "SEE ALSO"
.sp
ansible(1)
.sp
ansible\-playbook(1) \- pending
.sp
Ansible home page: https://github\&.com/mpdehaan/ansible/