Ansible Concepts: Difference between revisions
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The headings in brackets are ''group names'', which are used in classifying systems and deciding what systems you are controlling at what times and for what purpose. A host can be part of more than one group. | The headings in brackets are ''group names'', which are used in classifying systems and deciding what systems you are controlling at what times and for what purpose. A host can be part of more than one group. | ||
==Default Groups== | |||
There are two default groups: "all" and "ungrouped". "all" contains every host. ungrouped contains all hosts that don’t have another group aside from all. | |||
==Recursive Groups== | ==Recursive Groups== | ||
Revision as of 01:05, 16 May 2017
Internal
Inventory File
Ansible works against multiple systems at the same time. It does this by selecting portions of systems listed in Ansible’s inventory file. The default location of the inventory file is /etc/ansible/hosts.
A different location of the inventory file can be specified on the command line with:
-i <path>
Inventory File Structure
host1.example.com [webservers] web1.example.com web2.example.com [dbservers] db1.example.com db2.example.com
Groups
The headings in brackets are group names, which are used in classifying systems and deciding what systems you are controlling at what times and for what purpose. A host can be part of more than one group.
Default Groups
There are two default groups: "all" and "ungrouped". "all" contains every host. ungrouped contains all hosts that don’t have another group aside from all.
Recursive Groups
Recursive groups are declared with the [<group-name>:children].
[A] host1 host2 [B] host3 host4 [AandB:children] A B [AandB:vars] something=something-else
Group Variables
Group variables are declared with [<group-name>:vars]. If they are declared this way, the variables apply to an entire group at once.
[group-A] host1 host2 [group-A:vars] something=something-else