KUMA settings in the inventory file

The inventory file may include the following blocks:

all
kuma
kuma_k0s

For each host, you must specify the FQDN in the <host name>.<domain> format or an ipv4 or ipv6 IP address. The KUMA Core domain name and its subdomains must not start with a numeral.

Example:

hosts:

hostname.example.com:

ip: 0.0.0.0

ip: ::%eth0

all block

In this block the variables that are applied to all hosts indicated in the inventory are specified, including the implicit localhost where the installation is started. Variables can be redefined at the level of host groups or even for individual hosts.

Example of redefining variables in the inventory file

The following table lists possible variables in the 'vars' section and their descriptions.

List of possible variables in the vars section

Variable	Description	Possible values
`ansible_connection`	Method used to connect to target machines.	`ssh`—connection to remote hosts via SSH. `local`—no connection to remote hosts is established.
`ansible_user`	User name used to connect to target machines and install components.	If the root user is blocked on the target machines, use a user name that has the right to establish SSH connections and elevate privileges using su or sudo.
`ansible_become`	Indicates the need to increase the privileges of the user account that is used to install KUMA components.	`true` if the ansible_user value is not `root`.
`ansible_become_method`	A method for increasing the privileges of the user account that is used to install KUMA components.	`su` or `sudo` if the ansible_user value is not `root`.
`ansible_ssh_private_key_file`	Path to the private key in the format /<path>/.ssh/id_rsa. This variable must be defined if you need to specify a key file that is different from the default key file: ~/.ssh/id_rsa.
`deploy_to_k8s`	Indicates that KUMA components are deployed in a Kubernetes cluster.	`false` is the default value for the single.inventory.yml and distributed.inventory.yml templates. `true` – is the default value for the k0s.inventory.yml template.
`need_transfer`	Indicates that KUMA components are moved in a Kubernetes cluster.	`false` is the default value for the single.inventory.yml and distributed.inventory.yml templates. `true` – is the default value for the k0s.inventory.yml template.
`no_firewall_actions`	Indicates that the installer has completed the firewall configuration steps on the hosts.	`true` – — when the installer is started, the firewall configuration steps on the hosts are not performed. `false` — default value in all templates. The installer performs the firewall configuration steps on the hosts. If this setting is not specified in the template, the installer performs the firewall configuration steps on the hosts.
`generate_etc_hosts`	Indicates that the machines are registered in the DNS zone of your organization. In this case, the installer will automatically add the IP addresses of the machines from the inventory file to the /etc/hosts files on the machines where KUMA components are installed. The specified IP addresses must be unique.	`false`. `true`.
`deploy_example_services`	Indicates the creation of predefined services during installation.	`false`: no services are needed. The default value for the distributed.inventory.yml and k0s.inventory.yml templates. `true`: services must be created. The default value for the single.inventory.yml template.
`low_resources`	Indicates that KUMA is installed in environments with limited computing resources.	`false`: KUMA is installed for production use. In this case, the installer checks the requirements of the worker nodes (CPU, RAM, and free disk space) in accordance with the hardware and software requirements. If the requirements are not satisfied, the installation is terminated with the corresponding message. `true`: KUMA is installed in environments with limited computing resources. In this case, the Core can be installed on a host that has 4 GB of free disk space; no limitations are imposed on other computing resources. By default, this variable is not present in the inventory file template. If necessary, you can add the `low_resources` variable and assign a value to it.

kuma block

This block lists the settings of KUMA components deployed outside of the Kubernetes cluster.

The following sections are available in the block:

In the vars section, you can specify the variables that are applied to all hosts indicated in the kuma block.
In the children section you can list groups of component settings:
- kuma_core—KUMA Core settings. This may contain only one host.
- kuma_collector—settings of KUMA collectors. Can contain multiple hosts.
- kuma_correlator—settings of KUMA correlators. Can contain multiple hosts.
- kuma_storage—settings of KUMA storage nodes. Can contain multiple hosts.

kuma_k0s block

This block defines the settings of the Kubernetes cluster that ensures high availability of KUMA. This block is only available in an inventory file that is based on k0s.inventory.yml.template.

For test and demo installations in environments with limited computational resources, you must also set low_resources: true at the all level. In this case, the core volume is reduced to 4 GB and no limits are set for other computing resources.

Each host in this block must have its unique FQDN or IP address indicated in the ansible_host parameter, except for the host in the kuma_lb section which must have its FQDN indicated. Hosts must not be duplicated in groups.

For a demo installation, you may combine controller with a worker node. Such a configuration does not provide high availability for the Core and is only intended for demonstration of functionality or for testing the software environment.
The minimal configuration to ensure high availability includes 3 dedicated controllers, 2 worker nodes, and 1 load balancer. For industrial operation, it is recommended to use dedicated worker nodes and controllers. If a cluster controller is under workload and the pod with the KUMA Core is hosted on the controller, disabling the controller will result in a complete loss of access to the Core.

The following sections are available in the block:

In the vars section, you can specify the variables that are applied to all hosts indicated in the kuma block.
The children section defines the settings of the Kubernetes cluster that ensures high availability of KUMA.

The table below shows a list of possible variables in the vars section and their descriptions.

List of possible variables in the vars section

Variable group	Description

`kuma_lb`	FQDN of the load balancer. The user must install the balancer on their own. If the `kuma_managed_lb = true` parameter is indicated within the group, the load balancer will be automatically configured during KUMA installation, the necessary network TCP ports will be opened on its host (6443, 8132, 9443, 7209, 7210, 7220, 7222, 7223), and a restart will be performed to apply the changes.
`kuma_control_plane_master`	A host that acts as a dedicated primary controller for the cluster.	Groups for specifying the primary controller. A host must be assigned to only one of them.
`kuma_control_plane_master_worker`	A host that combines the role of the primary controller and a worker node of the cluster. For each cluster controller that is combined with a worker node, in the inventory file, you must specify `extra_args: "--labels=kaspersky.com/kuma-core=true,kaspersky.com/kuma-ingress=true,node.longhorn.io/create-default-disk=true"`.
`kuma_control_plane`	Hosts that act as a dedicated cluster controller.	Groups for specifying secondary controllers.
`kuma_control_plane_worker`	Hosts that combine the role of controller and worker node of the cluster. For each cluster controller that is combined with a worker node, in the inventory file, you must specify `extra_args: "--labels=kaspersky.com/kuma-core=true,kaspersky.com/kuma-ingress=true,node.longhorn.io/create-default-disk=true"`.	Groups for specifying secondary controllers.
`kuma_worker`	Worker nodes of the cluster. For each cluster controller that is combined with a worker node, in the inventory file, you must specify `extra_args: "--labels=kaspersky.com/kuma-core=true,kaspersky.com/kuma-ingress=true,node.longhorn.io/create-default-disk=true"`.

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