Add hosts

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 and configure hosts in ADCM using the SSH hostprovider, which is, essentially, a connector to already created hosts.

IMPORTANT

Before adding hosts in ADCM using the SSH hostprovider, make sure that:

  • The SSH hostprovider is installed in ADCM.

  • Hosts with the ability to connect via the SSH protocol are created in a cloud or on-premises. Notice that this operation is performed manually and is not supported by the current hostprovider.

The steps for adding hosts that are based on the SSH hostprovider are listed below:

  1. Select the Hosts item in the left navigation menu and click Create host.

    Add a host via ADCM
    Add a host via ADCM
  2. In the opened dialog:

    • Select a hostprovider in the Hostprovider field. Notice that hostproviders are displayed with the names that you have assigned to them.

    • Enter a host name without domains in the Name field.

    • Click Create.

    Describe a new host
    Describe a new host
  3. Return to the Hosts page and switch to configuring the added host. To do this, click the host name in the Name column.

    Switch to configuring a host
    Switch to configuring a host
  4. In the opened window, select the Primary Configuration tab, fill in parameters, and click Save.

    Configure a host
    Configure a host

    The assignment of parameters is listed in the table below.

    Host configuration parameters
    Parameter Description

    Username

    A user name that is used for connecting to a host via SSH

    Password

    A user password that is used for connecting to a host via SSH. If you don’t use a password, leave this field blank

    SSH private key

    A private SSH key that is used for connecting to a host via SSH. It is created in a pair with the public key that you define for a host when configuring it. If you don’t use SSH keys, leave this field blank

    Connection address (Hostname in previous hostprovider versions)

    An IP address of a host

    Port

    A port number that is used for connecting to a host via SSH (by default, 22)

    SSH args

    SSH arguments for Ansible. Each parameter requires the following format: -o <name>=<value>. Several parameters are separated by space: -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null.

    Thus, StrictHostKeyChecking=no and UserKnownHostsFile=/dev/null parameters disable strict host key checking for SSH. Otherwise, when this checking is enabled, the SSH client connects only to the known hosts that are stored in the known hosts list.

    Can be left at the default value

    Ansible become

    A flag that grants the superuser privileges to the user specified in the Username field. The default value should be used (flag is set)

    Ansible become password

    A password that is used during granting of the superuser privileges to the user specified in the Username field. Can be left at the default value

  5. Return to the Hosts page. In the row that contains the added host, click the actions default dark actions default light icon in the Actions column and select the Check connection drop-down menu item. Confirm the action in the opened window.

    Switch to the connection check
    Switch to the connection check
    Confirm the connection check
    Confirm the connection check
  6. Wait until the connection check is completed. If the connection check runs successfully, it means that the host is configured correctly and can be added to a new cluster.

    NOTE
    In case of errors, you can find logs on the Jobs page.
  7. After the connection check is completed, install statuschecker. It is a special daemon that periodically checks the status of the services and components added to the cluster hosts via ADCM. To install this daemon, click the actions default dark actions default light icon in the Actions column again and select the Install statuschecker drop-down menu item. Then confirm the action in the opened window.

    Switch to the statuschecker installation
    Switch to the statuschecker installation
    Confirm the statuschecker installation
    Confirm the statuschecker installation
  8. Wait until the statuschecker installation is completed.

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