intro_configuration.html
First one found from of
Contents of $ANSIBLE_CONFIG
./ansible.cfg
~/.ansible.cfg
/etc/ansible/ansible.cfg
Configuration settings can be overridden by environment variables - see constants.py in the source tree for names.
Patterns
intro_patterns.html
Used on the ansible command line, or in playbooks.
all (or *)
hostname: foo.example.com
groupname: webservers
or: webservers:dbserver
exclude: webserver:!phoenix
intersection: webservers:&staging
Operators can be chained: webservers:dbservers:&staging:!phoenix
Patterns can include variable substitutions: {{foo}}, wildcards: *.example.com or 192.168.1.*, and regular expressions: ~(web|db).*\.example\.com
Inventory files
intro_inventory.html, intro_dynamic_inventory.html
'INI-file' structure, blocks define groups. Hosts allowed in more than one group. Non-standard SSH port can follow hostname separated by ':' (but see also ansible_ssh_port below).
Hostname ranges: www[01:50].example.com, db-[a:f].example.com
Per-host variables: foo.example.com foo=bar baz=wibble
[foo:children]: new group foo containing all members if included groups
[foo:vars]: variable definitions for all members of group foo
Inventory file defaults to /etc/ansible/hosts. Veritable with -i or in the configuration file. The 'file' can also be a dynamic inventory script. If a directory, all contained files are processed.
Variable files:
intro_inventory.html
YAML; given inventory file at ./hosts:
./group_vars/foo: variable definitions for all members of group foo
./host_vars/foo.example.com: variable definitions for foo.example.com
group_vars and host_vars directories can also exist in the playbook directory. If both paths exist, variables in the playbook directory will be loaded second.
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