[Short Tip] Provide Dictionaries As Default In Ansible variables

[Short Tip] Provide Dictionaries As Default In Ansible variables

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Besides filters, variables can also be modified by the Python string methods: Python is the scripting language Ansible is written in, and and provides string manipulation methods Ansible can just use. In contrast to filters, methods are not attached to variables with a pipe, but with dot notation:

Ansible uses variables to enable more flexibility in playbooks and roles. They can be used to loop through a set of given values, access various information like the hostname of a system and replace certain strings in templates by system specific values. Variables are provided through the inventory, by variable files, overwritten on the command line and set in Tower.

Varialbes are a very powerful feature within Ansible to enrich the functionality it provides. Together with templates and the Jinja2 template and language engine the possibilities are almost endless. And sooner or later every admin will leave the simple Ansible calls and playbooks behind and start diving into variables, templates, and loops through variables of other hosts. To make system automation even easier.

For package recipes working in the user space, with local methods like conan install . and conan build .,there is no current user/channel. If you are accessing to self.user or self.channel in your recipe,you need to declare the environment variables CONAN_USERNAME and CONAN_CHANNEL or you can set the attributesdefault_user and default_channel. You can also use python @property:

Development project-wide variables, like the compiler, its version, or the OSitself. These variables have to be defined, and they cannot have a default value listed in theconanfile, as it would not make sense.

The good news is that Ansible provides the ansible_date_time variable that already has out-of-the-box information about date and time.This dictionary has a lot of keys and values that should be self-explicative and also enable a lot of use-cases.For example inside the Ansible Playbook, on debug messages, on output and input files.The only drawback is that the Ansible ansible_date_time variable requires Ansible Facts enabled, so the gather_facts: true statement on your Ansible Playbook.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'ansiblepilot_com-large-leaderboard-2','ezslot_6',117,'0','0'])};__ez_fad_position('div-gpt-ad-ansiblepilot_com-large-leaderboard-2-0');

To help provide consistency when configuring EVPN A/A ESI values, arista.avd provides an abstraction in the form of a short_esi key. short_esi is an abbreviated 3 octets value to encode Ethernet Segment ID and LACP ID. Transformation from abstraction to network values is managed by a filter_plugin and provides following result:

Ansible inventory file allows system administrators to keep track of their managed remote systems. The default inventory file is known as the hosts file and is located in the /etc/ansible directory. This is where all the managed remote nodes are specified.

As mentioned earlier, there is a default inventory file is located at /etc/ansible/hosts. Once you open the file using your preferred command line editor, you will see some basic guidelines about what is expected.

In Ansible, variables are used to handle differences between managed hosts. Using variables, you can represent variations between systems when executing playbooks or ad hoc commands. For instance, in the previous section we used the ansible_host variable that simply told Ansible where to search for the IP address of a managed node.

In Ansible, set_fact is used to set new variable values on a host-by-host basis which is just like ansible facts, discovered by the setup module. These variables are available to subsequent plays in a playbook. In the case of vars, vars_file, or include_var we know the value beforehand whereas when using set_fact, we can store the value after preparing it on the fly using certain tasks like using filters or taking subparts of another variable. We can also set a fact cache over it.

As described in Roles, variables can also be included in the playbook via include files, which may or maynot be part of an Ansible Role. Usage of roles is preferred as it provides a nice organizational system.

Usually these are discovered automatically by the setup module in Ansible. Users can also write custom facts modules, as described in the API guide. However, what if you want to have a simple way to provide system or user provided data for use in Ansible variables, without writing a fact module?

With fact caching enabled, it is possible for machine in one group to reference variables about machines in the other group, despite the fact that they have not been communicated with in the current execution of /usr/bin/ansible-playbook.

Another important thing to consider (for all versions) is that connection variables override config, command line and play/role/task specific options and keywords. See Controlling how Ansible behaves: precedence rules for more details. For example, if your inventory specifies ansible_user: ramon and you run:

Before we proceed, let's first organize our code into multiple files. As a general practice, the Terraform codebase is divided into multiple files based on the providers, resources, and variables. Let's create three files as below:

The split() function in python helps us split strings based on a separating delimeter. By default, the delimeter is a space character but we can provide another value such as a "," or a ";" in the split() function as well.

placeholder: To provide a visual example for what would be a good value. It is only shown while the answer is empty, so maybe it doesn't make much sense to provide both default and placeholder.

Question variables to mark as secret questions. This is especially useful when questionsare provided in the simplified prompt format. It's equivalent toconfiguring secret: true in the advanced prompt format.

A dictionary of values for Ansible playbooks and Ansible variables. The playbooks are run against the role instances after node provisioning, prior to the node network configuration. For more information about specifying Ansible playbooks, see ansible_playbooks properties.

primary: (array of object) The primary and security archive mirrors can be specified using the primary and security keys, respectively. Both the primary and security keys take a list of configs, allowing mirrors to be specified on a per-architecture basis. Each config is a dictionary which must have an entry for arches, specifying which architectures that config entry is for. The keyword default applies to any architecture not explicitly listed. The mirror url can be specified with the uri key, or a list of mirrors to check can be provided in order, with the first mirror that can be resolved being selected. This allows the same configuration to be used in different environment, with different hosts used for a local APT mirror. If no mirror is provided by uri or search, search_dns may be used to search for dns names in the format -mirror in each of the following:

mount_default_fields: (array of (string/null)) Default mount configuration for any mount entry with less than 6 options provided. When specified, 6 items are required and represent /etc/fstab entries. Default: defaults,nofail,x-systemd.requires=cloud-init.service,_netdev.

The module also provides keys for configuring the new puppet 4 paths andinstalling the puppet package from the puppetlabs repositories: _it_go.htmlThe keys are package_name, conf_file, ssl_dir andcsr_attributes_path. If unset, their values will default toones that work with puppet 3.x and with distributions that ship modifiedpuppet 4.x that uses the old paths.

A hostname and FQDN can be provided by specifying a full domain name under theFQDN key. Alternatively, a hostname can be specified using the hostnamekey, and the FQDN of the cloud will be used. If a FQDN specified with thehostname key, it will be handled properly, although it is better to usethe fqdn config key. If both fqdn and hostname are set,the prefer_fqdn_over_hostname will force the use of FQDN in all distroswhen true, and when false it will force the short hostname. Otherwise, thehostname to use is distro-dependent.

prefer_fqdn_over_hostname: (boolean) By default, it is distro-dependent whether cloud-init uses the short hostname or fully qualified domain name when both local-hostname` and ``fqdn are both present in instance metadata. When set true, use fully qualified domain name if present as hostname instead of short hostname. When set false, use hostname config value if present, otherwise fallback to fqdn.

Each users dictionary item must contain either a name or snapuserkey, otherwise it will be ignored. Omission of default as the first itemin the users list skips creation the default user. If no users key isprovided the default behavior is to create the default user via this config:

Downside: you cannot set the default group name to the user name; if a person using your role wants to customize only the name, they must also supply the group. With regular variables, those issues are gone: Both variables can be changed independently, and the default group name matches the user name.

parameters - A dictionary of parameters and optional metadata describing type and default.The metadata is structured data following the JSON Schema specification draft 4. The commonparameter types allowed are string, boolean, number (whole numbers and decimalnumbers - e.g. 1.0, 1, 3.3333, etc.), object, integer (whole numbers only -1, 1000, etc.) and array. If metadata is provided, input args are validated onaction execution. Otherwise, validation is skipped.

When dictionaries are nested within other data structures (particularly lists),the indentation logic sometimes changes. Examples of where this might happeninclude context and default options from the file.managed state:

Installation and maintenance of the observability stack does not belong in this article. Dashboards are most helpful if you can also look at historical data and not only use them for short-term review of incidents. Therefore, prefer using long-term storage such as Thanos or Cortex (and since recently in March 2022: Mimir). Those solutions provide a very good backup solution as well. 2b1af7f3a8