Add hosts

Daria Barysheva

In ADCM a host means a representation of a real hardware or virtual host. It doesn’t matter what infrastructure the original host uses — a cloud or bare metal.

The process of configuring hosts in ADCM differs depending on the selected hostprovider. This topic explains how to add hosts in ADCM using the Yandex Compute VM hostprovider. It allows to create several virtual machines (VM) in the Yandex.Cloud based on the predefined configuration.

IMPORTANT

Before adding hosts in ADCM using the Yandex Compute VM hostprovider, make sure that this hostprovider is installed in ADCM.

The steps for adding the hosts that are based on the Yandex Compute VM hostprovider are listed below:

  1. Select the HOSTPROVIDERS tab.

  2. Find the row with a necessary hostprovider, click the icon in the Actions column, and select the Create hosts action.

    yandex host create
    Switching to creating hosts in the cloud

  3. Set the Advanced flag and fill in all all necessary parameters in the opened dialog. The fields highlighted in orange are mandatory. You can also define the optional parameters, the default values of those you want to change.

    yandex host card
    Filling the parameters

    The purpose of all parameters is displayed in the table below.

    Configuration parameters
    Parameter Description Default value

    Count

    A number of VMs to be created in the cloud

     — 

    Name

    A prefix for VMs names. Every name is formed according to the <Name>-<VM number> template. Numbers start with 1. If only one virtual machine is being created and the numbering suffix is not needed, the host should be created at the HOSTS tab (similar to the GCE hostprovider)

     — 

    Additional users groups

    A list of additional Linux groups. All users should be added to this list at the moment the VMs are being initialized. For example, in the Altlinux image the ansible user should be added to the wheel group. Each group should be presented in the image. Becomes available after the Advanced flag being set

     — 

    Cloud-init timeout

    A timeout for cloud-init to finish the running tasks (in seconds). Becomes available after the Advanced flag being set

    600

    Init script

    The initialization script to be executed at VMs deployment. A shebang is not needed. Pay attention: this option is experimental, the single or double quotes may break the installation

     — 

    Image family

    A family of operating systems based on which VMs are created . The newest image from the specified family is used. Possible values are centos-7, centos-8, ubuntu-1804-lts, debian-10

    centos-7

    Snapshot id

    An ID of the boot disk snapshot. Incompatible with the Image id field. Becomes available after the Advanced flag being set

     — 

    Image id

    An ID of the boot disk image. Can be obtained via two commands:

    • yc compute image list --folder-id standard-images — for public images;

    • yc compute image list — for private images.

    Incompatible with the Snapshot id field. Becomes available after the Advanced flag being set

     — 

    Platform

    A processor type. For more information about supported platforms, refer to the Yandex.Cloud documentation. Possible values are Intel Broadwell, Intel Cascade Lake

    Intel Cascade Lake

    vCPU

    A number of vCPU

    2

    Perfomance level (%)

    A guaranteed processor performance level, that is allocated to VMs. See more details in the Yandex.Cloud documentation

    100

    Memory (GB)

    RAM (in GB)

    2

    Disk type

    A storage class of VMs. Possible values are SSD, HDD, SSD-NONREPLICATED

    HDD

    Disk size, GB

    A size of the boot disk, that is created for VMs (in GB)

    50

    Additional disks (JSON)

    Parameters of additional disks in the JSON format. The disk size should be specified in GB. The autodelete option defines whether or not the disk should be removed after the instance is removed. All parameters are required. Example:

    [
    { "autodelete": true,
      "description": "disk1",
      "type": "ssd",
      "size": 10 },
    { "autodelete": false,
      "description": "disk2",
      "type": "hdd",
      "size": 100 }
]

     — 

    Assign public ip

    Whether or not to assign the public IP addresses to VMs

    false

    Labels

    VMs labels in the format key:value. The labels, specified when adding VMs, have a higher priority compared to the labels, specified for the hostprovider

     — 

    Preemptible

    Whether or not to mark VMs as preemptible. Preemptible machines work for no longer than 24 hour and can be interrupted at any time. The rental cost in this case is much cheaper. The parameter may be defined only before the initialization

    false

    ADCM control connection address type

    A type of the IP address that is used to communicate with VMs. Determines whether the connection between ADCM and the cloud should use an external or internal route. Possible values are private and public

    private

  4. After all parameters are filled in, click Run.

    yandex host add run
    Running adding of the hosts

  5. Wait until the job is completed.

    NOTE
    In case of errors, you can find the logs at the JOBS tab.

  6. Check that virtual machines are created in the cloud according to the predefined configuration.

  7. Make sure that the hosts are added to ADCM. They should be available at the HOSTS tab.

  8. Apply the standard actions Check connection and Install statuschecker to the hosts via ADCM.

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