ansible combine lists

To subscribe to this RSS feed, copy and paste this URL into your RSS reader. One of the most often-requested features in Ansible was a way to merge You can declare and create a dictionary using the normal variable declaration methodology of Ansible. See my tutorial Creating a Kubernetes Cluster with Vagrant and Ansible for a full example of how to use meta folders and dependencies. the combine filter. As this turned out to be not that trivial, I'll document it here mostly for my own reference. The intent is to add additional recipients to the recipients list in a third dictionary. Merging lists of dictionaries Ansible Documentation Has a bill ever failed a house of Congress unanimously? The common role will have the needed task to create the cron job using the provided value in common_cron_job. By default, Ansible will override variables in specific precedence orders, as described in Variables. hashes. In Ansible parlance facts are variables too. We have a list of three dictionaries stored inside an array or list. 45 (Related to Callbacks or hooks, and reusable series of tasks, in Ansible roles ): Is there any better way to append to a list or add a key to a dictionary in Ansible than (ab)using a jina2 template expression? In the assignment expression we will need to use filter "combine" to add new key-value pairs to the existing dictionary. changeable, indexed and unordered. user146134 Actually specific crons are manually entered in servers, we want to all automate it. possibility that x is not defined. this playbook would return the following result upon execution. But that would be redneck as hell considering we have hundreds of groups, Create a role for each function (OTA, MTL, DMZ, APP, CUSTOMER_X, CUSTOMER_Y). How to modify a list of dictionaries with Ansible - 0xf8.org What is the Modified Apollo option for a potential LEO transport? The Cookies collected are used only to Show customized Ads. How to get Romex between two garage doors. What is Ansible Map Filter and How it works? Learn more about Stack Overflow the company, and our products. # two => [[1, "a"], [2, "b"], [3, "c"], [4, "d"], [5, "e"], [6, "f"]], # three => [ [ 1, "a", "d" ], [ 2, "b", "e" ], [ 3, "c", "f" ] ], # shorter => [[1, "a"], [2, "b"], [3, "c"]], # compose dict from lists of keys and values, Protecting sensitive data with Ansible vault, Virtualization and Containerization Guides, Collections in the Cloudscale_ch Namespace, Collections in the Junipernetworks Namespace, Collections in the Netapp_eseries Namespace, Collections in the T_systems_mms Namespace, Controlling how Ansible behaves: precedence rules, ansible.builtin.zip filter combine list elements. stackoverflow, What are lists? this was what i was looking for, thank you so much :), Why on earth are people paying for digital real estate? Is religious confession legally privileged? If you need more than a single job for each group, modify the code to pass a struct of jobs. This describes the input of the filter, the value before | ansible.builtin.zip. For example, a variable that is lower in the list will override a variable that is higher up. Server Fault is a question and answer site for system and network administrators. In this post we are going to how Ansible JSON processing works. . How does the theory of evolution make it less likely that the world is designed? Ask Question Asked 7 years, 7 months ago Modified 2 years, 10 months ago Viewed 28k times 9 I have a task which uses with_subelements but it's terrible slow for big list (especially that most of the elements has duplicates and I don't need to run it multiple times for them). At the end all the needed cron jobs will be created. This describes positional parameters of the filter. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Copyright Ansible project contributors. In this segment, we are going to see how to create a List of dictionaries. Combine Lists of Objects in Ansible - DevOps Stack Exchange it's a global setting, and not convenient to use. Combining and selecting data Combining items from multiple lists: zip and zip_longest Combining objects and subelements Combining hashes/dictionaries Selecting values from arrays or hashtables Combining lists permutations combinations products Selecting JSON data: JSON queries Randomizing data Can someone please explain why? .The answers are 1 and 1. This is much more helpful while creating variables in a dynamic manner. Remove outermost curly brackets for table of variable dimension, Science fiction short story, possibly titled "Hop for Pop," about life ending at age 30. List of lists made of elements matching the positions of the input lists. In most cases, you can use the short plugin name combine even without specifying the collections: keyword. In this post, we are going to see how to create a dictionary in ansible during the playbook execution dynamically and how to add items or elements to a dictionary. Identifying large-ish wires in junction box. This lookup plugin is part of ansible-core and included in all Ansible installations. I then need to merge them for a final task. One way to add/append elements is during the declaration time which we have seen in the last two examples. How to combine two lists? Combine the dictionaries in a loop: set_fact: host_network_info: " { { host_network_info | default ( []) + [dict (interface=item [0], ip=item [1])] }}" loop: " { { ansible_interfaces | zip (host_ipv4_list) | list }}" Share Improve this answer Follow Hope the following picture would give a quick idea about the dictionaries. For more practical videos and tutorials. I just want to append a new data to Strings, rest all should be as it is. Here is the execution result of this playbook, One more best example of this dynamic dictionary creation is in our other article, where JSON data gets processed and created as a phonebook using ansible dictionary. Ok, I searched, what's this part on the inner part of the wing on a Cessna 152 - opposite of the thermometer, Spying on a smartphone remotely by the authorities: feasibility and operation, Book set in a near-future climate dystopia in which adults have been banished to deserts, Remove outermost curly brackets for table of variable dimension. Be aware that you will also need a way to clear created cron jobs that are not needed anymore (tip: use a common_cron_job_delete var and its corresponding task). you can place your dictionary variable under the vars segment of your playbook like this, In the following playbook, you can see that we have created a dictionary named mydict and stored some key-value data and displaying it using the debug statement, execution result of this playbook would be as follows. Appending to lists or adding keys to dictionaries in Ansible During the infrastructure automation, we might end up in a situation where we need to process Huge datasets, especially in JSON format. So let's proceed. How to append to lists in Ansible - Crisp's Blog Use lots of debug tasks to see your data manipulation, so that you don't get lost in jinja purgatory. If True return an error on mismatching list length, otherwise shortest list determines output. I have written an article on Ansible List too. But we got here is, [ ( {'i_am': 'sam', 'eggs_ham': '456'}, AnsibleUndefined ), ( {'i_am': 'sam', 'eggs_ham': 'ham'}, {'transport': 'train'}), ( {'i_am': 'eggs', 'eggs_ham': '456'}, AnsibleUndefined )] Since no value is assigned to transport_fact_results when common_thing_2 is not defined. 120, 10, 3, ?, ? using Ansible set_fact for appending this. The term "list" is self-explanatory, but here are some ways to represent lists: vars: bands: - The Beatles - Led Zeppelin - The Police - Rush bands2: ['The Beatles', 'Led Zeppelin', 'The Police', 'Rush'] Why did the Apple III have more heating problems than the Altair? Do you need an "Any" type when implementing a statically typed programming language? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. don't want to alter any other content in this. Sci-Fi Science: Ramifications of Photon-to-Axion Conversion. If you have two or more lists of dictionaries and want to combine them into a list of merged dictionaries, where the dictionaries are merged by an attribute, you can use the lists_mergeby filter. Why did Indiana Jones contradict himself? The best answers are voted up and rise to the top, Not the answer you're looking for? the same filter plugin name. One of these scenarios is how to modify an existing list of dictionaries with Ansible. Example, in role app folder meta, create a file main.yml with the following content: The value of app_common_cron_job can be set in each ansible group, for example input | ansible.builtin.zip(positional1, positional2, key1=value1, key2=value2). Ansible 2 (currently in 2) finally includes a configuration setting offers similar (recursive-only) functionality, but rev2023.7.7.43526. Typo in cover letter of the journal name where my manuscript is currently under review, Python zip magic for classes instead of tuples, DMZ (reverse proxies exposed to internet), CUSTOMER_X (server that contains customer X), CUSTOMER_Y (server that contains customer Y). How to merge two lists together: - debug: msg="Append list to list, or merge two lists" - name: Setup two lists to be merged set_fact: list_one: - 1 - 2 - 3 list_two: - 4 - 5 - 6 - name: Merge the two lists set_fact: lists_merged: " { { list_one + list_two }}" - name: Demonstrate merged lists debug: var=lists_merged So I'm looking for a way to optimize it somehow. Thanks to Using set_fact to create an Ansible list As you might know, Ansible has a special directive called set_fact to create facts. How to concatenate with a string each element of a list in ansible 1 loop requires a valid list. In most cases, you can use the short plugin name items even without specifying the collections: keyword. These are the values positional1, positional2 and so on in the following set_fact. plugin name Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You can use combine filter in 2.9. Combining these techniques makes it It's been in Ansible since 2.3. ansible merge two lists based on an attribute - Stack Overflow Ansible Dictionary - How to create and add items to dict different Note the use of default({}) to address the You can optimize the roles, avoiding repeating code, by using a common role that is added as a dependency on the meta folder. What is the number of ways to spell French word chrysanthme ? Manipulating data Ansible Documentation Do you mean that you only want to change the. It only takes a minute to sign up. Lists are the equivalent of an array, something used in many real programming languages ( which Ansible is not ). Note The output of the examples in this section use the YAML callback plugin. In this segment, we are going to see how to append or add items into Ansible dictionary and how to create a list of dictionaries (or) List with nested dictionaries. For example. I know you can do something like: (Ep. To declare the variable within the task we use set_fact module. Merging variables in Ansible with roles - Server Fault ." Using filters to manipulate data Ansible Documentation Repository (Sources) We have many servers groups, for example : Each server group have their own cron jobs, and a server can belong to many matched and unmatched groups (a server can be in all groups MTL, DMZ, APP, CUSTOMER_Y and CUSTOMER_X). the mailing lists Ansible: extracting a list or dictionary from a complex data structure By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Learn more about Stack Overflow the company, and our products. However, I stumbled across this blog post https://www.itix.fr/blog/ansible-add-prefix-suffix-to-list/ that used a different method that worked in Ansible 2.9.x. ansible.builtin.zip filter - combine list elements The best answers are voted up and rise to the top, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. .The answers are 1 and 1. 6 Answers Sorted by: 13 I really didn't like using the add-on filters or the loop. way to do this: 1 " { { ansible_interfaces | map ('upper') | list }}" use just "+" operator to combine two lists into one, like: 1 " { { ansible_interfaces + [\"VETH-1\", \"VETH-2\"] }}" check here for more advanced example: Advanced list operations in Ansible Ansible filters and lists operators How much space did the 68000 registers take up? you can do the same with lists. For example APP servers have their own crons, MTL servers have their own crons etc .. with_flattened won't do the trick since the same reason as, Ansible merge lists of many matched group_vars, Creating a Kubernetes Cluster with Vagrant and Ansible, Using Ansible for Terraform Managed AWS Infrastructure, Why on earth are people paying for digital real estate? Ansible Map Examples - Filter List and Dictionaries | Devops Junction Connect and share knowledge within a single location that is structured and easy to search. 120, 10, 3, ?, ? - name: Use both shell: do_something { { item.0.name }} { { item.1.stdout }} with_together: - " { { the_list }}" - " { { spells.results }}" - set_fact: output: " { { list_to_suffix | product ( ['-Z']) | map ('join') | list }}" Share How to get Romex between two garage doors. I would be very grateful for any thoughts. Creating a Dictionary under vars section in Ansible, Creating a Dictionary in Ansible using the default function, A real-time example of a complex Nested List and Dictionaries of Ansible, A JSON data processing with Dictionary techniques and Json_query ansible, How to handle Data processing Errors with Ansible, Dict Object, How to Filter and Select elements from Dictionary using Ansible select_attr, Ansible Map Examples - Filter List and Dictionaries, Ansible read JSON file - JSON file Parsing, Ansible JSON - Parse JSON using Ansible json_query, Add SSH Key to EC2 instances with Ansible - Automated, Ansible lookup file - How to Read file into variable in Ansible, Ansible Playbook Examples - Sample Ansible Playbooks | Devops Junction.

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