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At its most basic, this is nothing more than an array or hash lookup,
but when used in conjunction with map, it is very useful. For example,
while constructing an "ssh-keyscan …" command to update known_hosts on
all hosts in a group, one can get a list of IP addresses with:
groups['x']|map('extract', hostvars, 'ec2_ip_address')|list
This returns hostvars[a].ec2_ip_address, hostvars[b].ec2_ip_address, and
so on. You can even specify an array of keys for a recursive lookup, and
mix string and integer keys depending on what you're looking up:
['localhost']|map('extract', hostvars, ['vars','group_names',0])|first
== hostvars['localhost']['vars']['group_names'][0]
== 'ungrouped'
Includes documentation and tests.
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| .. | ||
| modules | ||
| ansible_ssh_changes_note.rst | ||
| become.rst | ||
| common_return_values.rst | ||
| community.rst | ||
| developing.rst | ||
| developing_api.rst | ||
| developing_inventory.rst | ||
| developing_modules.rst | ||
| developing_plugins.rst | ||
| developing_test_pr.rst | ||
| faq.rst | ||
| galaxy.rst | ||
| glossary.rst | ||
| guide_aws.rst | ||
| guide_cloudstack.rst | ||
| guide_gce.rst | ||
| guide_rax.rst | ||
| guide_rolling_upgrade.rst | ||
| guide_vagrant.rst | ||
| guides.rst | ||
| index.rst | ||
| intro.rst | ||
| intro_adhoc.rst | ||
| intro_bsd.rst | ||
| intro_configuration.rst | ||
| intro_dynamic_inventory.rst | ||
| intro_getting_started.rst | ||
| intro_installation.rst | ||
| intro_inventory.rst | ||
| intro_patterns.rst | ||
| intro_windows.rst | ||
| modules.rst | ||
| modules_core.rst | ||
| modules_extra.rst | ||
| modules_intro.rst | ||
| playbooks.rst | ||
| playbooks_acceleration.rst | ||
| playbooks_async.rst | ||
| playbooks_best_practices.rst | ||
| playbooks_blocks.rst | ||
| playbooks_checkmode.rst | ||
| playbooks_conditionals.rst | ||
| playbooks_delegation.rst | ||
| playbooks_environment.rst | ||
| playbooks_error_handling.rst | ||
| playbooks_filters.rst | ||
| playbooks_filters_ipaddr.rst | ||
| playbooks_intro.rst | ||
| playbooks_lookups.rst | ||
| playbooks_loops.rst | ||
| playbooks_prompts.rst | ||
| playbooks_roles.rst | ||
| playbooks_special_topics.rst | ||
| playbooks_startnstep.rst | ||
| playbooks_strategies.rst | ||
| playbooks_tags.rst | ||
| playbooks_variables.rst | ||
| playbooks_vault.rst | ||
| quickstart.rst | ||
| test_strategies.rst | ||
| tower.rst | ||
| YAMLSyntax.rst | ||