Install a cluster

Olga Semme, Daria Barysheva

Step 1. Run installation

There are two ways to install cluster services:

  1. Whole cluster. In this method all services are installed automatically one by one after applying the Install action to a cluster.

  2. Single services. In this method each service is installed manually after applying one or more actions to it. This way is also suitable for installing new services in the already deployed cluster.

In both cases each service starts automatically after installation.

IMPORTANT
The installation must be performed on a clean host with no previous installations of related or similar software.

Whole cluster

To install all cluster services within a single action, follow the steps:

  1. Apply the Install action to the cluster selected on the Clusters page by clicking the actions default dark actions default light icon in the Actions column.

    Switch to the whole cluster installation
    Switch to the whole cluster installation

  2. In the dialog box that opens, select the required options for installation.

    Select parameters for installation
    Select parameters for installation

    The purpose of the parameters is given below.

    Parameter Description

    Disable SELinux

    Disable SELinux on added hosts. In order for this setting to be applied, after the completion of the Install operation, you must restart the hosts manually

    Disable Firewalld

    Disabling firewalld on hosts

    Install OpenJDK

    Install package java-1.8.0-openjdk on hosts

    Set vm.swappiness to 0

    Disabling swapping on hosts

    Configure /etc/hosts

    Write added nodes to /etc/hosts on cluster hosts. It is recommended to disable this option if DNS is configured

    Set service checks

    Enables service checking when starting an action

  3. Verify the action in the opened window.

    Action confirmation
    Verify the action

  4. Wait until the job is completed.

Single services

To install one or several cluster services manually, you should add these services to the cluster and then perform the actions described below.

CAUTION
Notice that services are installed one by one. Do not install another service until the installation of the previous one is completed.

  1. Open the Services tab on the cluster page. For each service that should be installed, click the actions default dark actions default light icon in the Actions column and select the Install action.

    Switch to installation of single services
    Switch to installation of single services

  2. In the dialog box that opens, select the required parameters for installation and click Run.

  3. Verify the action in the opened window.

    Action confirmation
    Verify the action

  4. Wait until the job is completed. Then check that the service state has changed from created to installed.

  5. Repeat the previous actions for other services that should be installed.

IMPORTANT

  • When you install services manually, one by one, use the following order:

    • ZooKeeper;

    • Kafka manager, Kafka, NiFi (one by one);

    • other services.

  • Installing a Kafka service in the KRaft mode requires additional steps. For information, see Kafka installation in the KRaft mode.

Step 2. View the results of installation

ADCM starts a single job for installation process, as well as for any other task. You can find out about the status of jobs more specifically on the Jobs page.

The Jobs page
The Jobs page

The successful completion of the service installation is determined by the transition of the job from the running status to the success status on the Jobs page. If the job fails, it switches to the failed status. In this case it is possible to see more detailed information about the errors that occurred by clicking the failed job on the Jobs page.

Switch to a job page
Switch to a job page

A job page contains two sections: ansible [ stdout] and ansible [ stderr ]. These are technical logs of the job that include information from standard I/O streams stdout/stderr. These logs can help to understand what caused the problems.

There can also be the optional third section ansible [ check ]. These are the logs of the most frequent errors checks. The description of these errors is more simple and specific, than in two previous technical logs.

The contents of all three sections should be studied if errors occur.

Job page
Job details

Step 3. Check the cluster state after installation

As a result of successful installation, the cluster and its services change their state according to the following rules:

  • The cluster state, displayed in the State field on the Clusters page, is being changed from created to installed.

    The cluster state after successful installation
    The cluster state after successful installation

  • The state of cluster services, displayed on the Services tab of the cluster page, is being changed from created to installed.

    The state of cluster services after successful installation
    The state of cluster services after successful installation
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