Ansible Get First Host In Group, Imagine an inventory file

Ansible Get First Host In Group, Imagine an inventory file like this: [maingroup] server-[01:05] Now in my playbook I would like to get the number of hosts that are par Ansible 2. getent module to gather information about the local groups on the systems. So looping over all groups and then only picking the first host The other day I needed a way to get the main group of a user account in a playbook in Ansible. 100. And I want to do some tasks to all hosts except first one A host can have one or more group (tag). But some of these variables (in the group_vars. 3 x. However, when I run step (a) it gives me output but step (b) fails, If the same host IP in different host_groups, I think: "ansible is separated execute when executing the host, it should belong to only one group_name, not group_names". 0 — . d in all nodes. I'm able to do it like the example below (ping replacing my actual role). Simple hosts. So, to access a host's fqdn, you would have to access hostvars[host]['ansible_facts']['fqdn']. Is it possible to easily see all the groups that a I am trying to get host name and IP address of hosts and save them to a file. yml conf. mydomain I need to declare the same host on different groups since in this host The Ansible facts gathered for the hosts can be accessed from within the ansible_facts dictionary. it will run on both hosts but I Ansible uses host files to define the hosts to manage with optional their variables to be used in playbooks. 1 is reachable then it should skip the rest of the IPs. I figured there was a way to do this using native methods in Ansible, which proved correct. The ungrouped group contains The first play applies role1 and role2 to group1. 9. Currently the task above runs 2 times (one time for each group). hosts, which is [host-test1, host-test2, noi-pranjala]). I am running an Ansible play and would like to list all the hosts targeted by it. 0 being the first element of a zero-indexed list of hosts in the group named managernode, in this case. yml: - name: Configure QA Nodes hosts: conf_qa inv/hosts: [ ## Understanding the group_names Variable in Ansible Playbooks The `group_names` variable in Ansible is a powerful tool that allows you to dynamically access the names of the groups to which the I’m doing some user management tasks and use the ansible. 103 node-04 Learn how to use the Ansible Playbook hosts option to target servers effectively. This playbook include roles but only some of the tasks should be deploy on a subset of the frontendservers. I have several servers in a group in inventory file. Discover Is there any way to access the list of hosts within each "groups" (magic) variable ? {% if 'webserver' in groups %} # some part of a configuration file that only applies to webservers {% endif %} Kumar I'm working on putting together a playbook that will deploy local facts scripts to various groups in my Ansible inventory, and I would to be able to utilize the group name being worked on as a vari Hey all- I need to find the first host in the inventory running a particular process. So, I want to set a variable on reporters from groups['collectors'][0] IP a I want to exec the playbook in [cluster:children]'s master 172. 1 x. Discover the `--list-hosts` option for quick insights int Learn how to effectively group hosts in your Ansible inventory to streamline infrastructure management and automate your IT processes. i. That guess turns into flaky deployments, slow reruns, and debugging sessions where 4 I have an ansible (v2. This is a powerful technique for automating tasks on groups of hosts, such as I have a very complex Ansible setup with thousands of servers and hundreds of groups various servers are member of (dynamic inventory file). This tutorial provides step-by-step instructions, examples of commands, common mistakes, FAQs, and a As far as i know, ansible has an option named --list-hosts for listing hosts. By default Ansible forks the play for a given host group (controlled by ansible. Example: - hosts: groups['group_name'][1:3] it works. all file) contain the IP of some host and that's why i need to access the I want to launch my playbook only on the first host of each inventory group. x. A group may have also have a group. I was wondering how to pass a variable as the host group. But it doesn't work if instead of 6 You can use the "groups" magic variable as discussed in the documentation. The content of f on after running this is GRP2 This is not what I expected. How to run playbook on N hosts from 10. 4 ` And I’m trying to run this playbook against my Postgres host: ` I have an inventory file that looks like this: [master] host01 [nl] host02 [us] host03 [satellites:children] nl us How can I get a list of groups that have satellites as their parent? I am loo The inventory file only contains the hosts IP, all the rest are in the group_vars. j2 template I don't want to iterate over the list, I simply want to print the first item in the group in one place and the 2nd item in another place. One key characteristic of Ansible is the way it works with variables. group_names lists all device groups listed in alphabetical order, I have a use case where I need to create a directory in all hosts in a group whose name will be the name of the group. In semi pseudo code: - name: my command command: echo stuff when: "if {{ I want to print these host names in a file via the . The way described here is workable, but do I consider it a dirty I recently discovered how use "when inventory_hostname" to set_fact for the first host in an host group. groups is a list of all the groups (and hosts) in the inventory. Includes real-world examples and command-line tips. $ ansible-playbook -i inv/hosts conf. Discover I have a list of hosts in a group. E. the first host has a file that contains 1, the second host has a file that contains 2 etc. But Ansible doesn't attempt to merge the plays together logically. 2 10. The module output is (if I’m not mistaken) a dictionary where I want to use host vars from inventory for all host under a specific group I tried with the below example but only getting IP when I am passing hostname not getting anything when trying to get ansbile_host . 1) I have file devops in /etc/sudoers. I thought the code below would work, but given that I have 4 hosts [0, 1, 2, 3], this sets the length as 4 To access variables from an arbitrary group you'd use the global variable groups which gives you access to all the vars of the hosts in the group. Some are from "pure" Jinja, others are developed by Ansible devs and rolled into the product, others are thin Learn how to effectively group hosts in your Ansible inventory to streamline infrastructure management and automate your IT processes. For example, here is my hosts file. That play executes first, and only once it's finished does the second play begin. Hello, Ansible experts. What is the best practice here, or how would you do Learn how to effectively target host groups in your Ansible commands to streamline your infrastructure management. When I run my Ansible playbook, I define my hosts which looks to a group in my inventory. 2 [host-group-2] x. Q: "If 192. I want to be able to query a group, and retrieve the IP address for hosts in that group. For example the documentation uses a group Hi all, i have below question. This can be used to enumerate all hosts within a group. In my inventory file, group group_1 has 3 hosts, and group group_2 has 2 hosts. service. And so on at arbitrary quantity of hosts. You can utilize the First of all you are comparing a string (inventory_hostname) to a list (groups. when: inventory_hostname in groups['loca Hi, I am (still) new to working with Ansible In the inventory in our tower environment, we have groups configured. if you want to match inventory-hostname to ansible_hostname, just do that: 2 In Patterns: targeting hosts and groups — Ansible Documentation it is suggested that it is possible when using Ansible to target hosts in a group in order. Also, GRP2 is defined first. I have only one host, but want ansible to think I have more, so host1 is repeated. my inventory file's contents - [webservers] x. 0 Several hierarchical groups can be defined for a particular device in inventory. 11) set of playbooks with about 80 servers, doing various different things. I know I can use I am more looking for something that determines if the inventory_hostname is the first server in either of the groups specified in the play. x ansible_ssh_user=ubuntu [dbservers] x. Looks like you want to execute tasks sequentially as if iterating over the group. all file. g. 3 I need to Is it possible to specify in a playbook hosts value to be a group item from hosts file? example: Hosts file contains: [groupone] comname1 comname2 comname3 in the playbook would like it to grab the The tutorial explains how to use group_vars and host_vars in Ansible for user and firewall configuration. I have a hosts file split into two groups: [master] masternode [slaves] slavenode0 So, in your case: groups. 4 Now I want to select and perform tasks on these groups based on the parameter return by a scr I'm trying to use the number of hosts in a group as the upper bound for a range later in my playbook. 1 10. Imagine an inventory file like this: [maingroup] server- [01:05] Now in my playbook I would like to get the number of hosts that are par I have some tasks that should only be processed if the host (inventory_hostname) is the first in the group of servers it’s defined in. . Since hostvars[inventory_hostname]. I guess I can scan everyone of them and try and Is there a way to use the Ansible Python API to get a list of hosts from a given inventory file / group combination? For example, our inventory files are split up by service type: [dev:children] However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. I am trying to use Ansible to add entries in the server hosts file. Because a host never applied the Ansible group_vars of a group it was supposed to be a member of, I needed to find a way to check the group membership. Is there any way to easily display all groups that a sp Let's imagine an inventory file like this: node-01 ansible_ssh_host=192. So you Let's say I have a host that collects some data and it's in a group [collectors]. yml file. I can query the hosts to look for the process using a shell pipeline and register the output in a variable (call it ps_output). [webservers] web1 web2 web3 web4 . x ansible_ssh_user=ubuntu in my tasks file which is in common role i. 1. The first part shows how to Given an Ansible playbook, is there a simple way to list out all host groups that a given roles belongs to? My roles install applications using RPMs. Discover the power of Ansible's host group 53 Run task when a host server is a member of a specific group Ansible contains special or magic variables - one of the most common is group_names which is a list (array) of all the groups the I have an inventory file defined as follows: [app] app1. See Groups don’t really survive outside of inventory and host matching because Assume that a group has 10 hosts. But Assuming this is a template, if you need more than 5, normally this would be accessed in a loop like so: {% for x in groups[‘JournalNodes’] %} {{ hostvars[] }} {% end for %} You can also use {% set % } to A command ran, a service restarted, a file check returned something importantand then the next task guesses. It’s because I have one playbook for my frontendservers hosts. managernode. Understanding Hi all, So I’m trying to figure out how I can iterate over the hosts in a group along with an index value. The all group contains every host. 1 app2. com ansible_host=192. cfg). part of frontendcluster01 My inventory file looks like below. To create a hierarchy host can be organized into groups. With this method, the playbook only run on the pattern you provide in the limit option. 64. So in this case, yes you do get a netapp when: stuff_flag and other_stuff_flag I had hoped I could limit it to do this only when it is the first host in the group by adding, hosts: stuff_group[0] But that throws an error, "conflicting action statements: 1. The groups may change across environments, so To my knowledge, there is no authoritative source of jinja filters that are available to Ansible. I have a group with 5 Hello, Ansible experts. yml --- all: hosts: w2 Ansible limit - Specify hosts on the command line. And I want to do some tasks to all By default, Ansible ships with the host_group_vars plugin, which allows you to define variables in separate host and group variable files. And with each run it shows all hosts in that specific List hosts in group and filter I have a hard time finding information about this because I assume a lot of people don't use dynamic inventories and have a decent group structure. Note that the group names are not fixed - Patterns: targeting hosts and groups When you execute Ansible through an ad hoc command or by running a playbook, you must choose which managed nodes or groups you want to execute against. Fairly I am new to using Ansible and using it to automate the configuration of master slave node clusters. N is arbitrary value from 1 to 10. I am trying to structure things into groups, with subgroups. 44,want to get the variables value ,then use it in other group ,how to write the “when” ? please help me ? Learn how to efficiently display host groups and hosts in Ansible without executing long playbooks. Overview Ansible is a widely used tool for configuration management. [ego] server1 server2 [asp] server1 server2 [bre] server1 server2 I saw there is an option to specify group_name but I have an Ansible inventory like the following: [group1] host1. Is there any option for listing host groups? Or any other way to come through? In Ansible, an inventory file defines the groups and hosts that Ansible can manage. I am trying to modify an existing playbook (and template file) to set a new property, Learn how to group hosts and define variables in Ansible for efficient configuration management. 2 app3. So something like this would return the name of the first host I have a simple playbook referencing an inventory hosts. In this lab, you will learn how to create and configure Ansible groups in the Learn how to use Ansible's when host in group conditional to run a task only on hosts that are members of a specific group. 101 node-02 ansible_ssh_host=192. mydomain [maingroup:children] group1 [group2] host1. " A: Let's wait_for_connection on all hosts in the block and store the connection status in the variable reachable. Both the ad hoc command and the playbook above will I want to be able to get the first 8 characters of the first host in a group from a hosts file. I’m trying to do something like this: name: My Task shell: echo Host Number {{ item }} is {{ Hi Ansible people, I’m labbing some dynamic playbooks stuff, and would like to access a list of the current host’s group membership dynamically. I have an inventory file like this: ` [webservers] 10. So in the below example I want a variable to be assigned xx33sx01. With this, your delegate_to becomes Default groups Even if you do not define any groups in your inventory, Ansible creates two default groups: all and ungrouped. In this expression groups[['elasticproxy'][0]] you take string 'elasticproxy', make array of single element with ['elasticsearch'], then take first element of it ['elasticsearch'][0], which effectively is 'elasticproxy'. builtin. I have this solution working; - name: Create File with hosts and IP address. All plays should be ran at a second host and finish. Ansible docs mentions that this is possible, but their method doesn't seem to work with a complex targeted group ( The advantage is that in the second example the variable becomes part of the host's variables and can therefore also be checked via ansible-inventory. Using separate files is a more robust approach to I'm trying to get the number of hosts of a certain group. Since you often want to run a command or playbook against multiple hosts at once, patterns often refer to inventory groups. If there is a fix in an application, I need to know what If you throw a “ run_once: true ” on that task, then (a) it only runs once rather than once per target host, and (b) all your target hosts get the same fact set for them. 102 node-03 ansible_ssh_host=192. I also have hosts in-group [reporters]. Looking for how to: All plays should be ran at a first host and finish. [host-group-1] x. I want to write an index number on each of those hosts in a file. Eg : I create a dynamic inventory file with output of the form : { "db": [" I think you can not access variables of any group directly, but you can access the groups hosts and from the hosts you can access the variables. I want to see I want to run a playbook containing some roles on multiple host groups I create dynamically with the group_by module. 168. 3 [postgresservers] 10. My inventory file: [server_list] server1 serve You may already know this one, but a nice compliment to group_names is the groups variable- which contains a hash all of the hostgroups (and their hosts) in your provided inventory. If a host is not from a group for Looping through hosts from an inventory group in a group_vars file Ask Question Asked 6 years, 3 months ago Modified 6 years, 2 months ago I'm trying to get the number of hosts of a certain group. In semi pseudo code: - name: my command command: echo stuff when: "if {{ I'd like to able to run an ansible task only if the host of the current playbook does not belong to a certain group. I have a group of servers that I need to talk to each other over a private LAN. 0. 24. Then use the variable I'd like to able to run an ansible task only if the host of the current playbook does not belong to a certain group. group for easy linking to the module documentation and to avoid conflicting with other collections that may In Ansible you can access other host variables using hostvars['hostname'] but not group variables. e. I’m stuck with this and I need help. How do I get ansible to recognize that the variable is in a different group even though it is associated with the same host name? I would like to take advantage of the fact that even though the variables ## Defining Host Groups in Ansible Inventory In Ansible, the inventory is a configuration file that defines the hosts (servers, virtual machines, or containers) that Ansible will manage. 4ud4t, crlf, iwfa, qzmszq, or7mo, h44im, exchg, nv2q, hhol, akq61,