To download and run the Interactive Precheck utility from a Standalone package, do the following:

To download and run the Interactive Precheck utility, which comes as part of Unravel installation, do the following:

This section covers general information about your Unravel install. You are prompted for the following:

-- General information
Which data platform are you installing for?
   1- Hadoop
   2- EMR
   3- HDI
   4- Databricks
   5- Dataproc

   Select one of the above [Hadoop]: 

Which type of Unravel node is this?
   1- Single node installation
   2- Core node
   3- Edge node

Select one of the above [Single node installation]: 
-- Core node - Log receiver information
   Hostname [None]: some.host.exampl
   Port (integer) [4043]: 
   TLS (y/n) [No]: y

   Attempting to connect to: https://some.host:4043/status

   Testing connection...
   Connection information:
     - Resolved IP:  89.163.146.49
     - Reverse lookup: ('app-002-de.some.host', [], ['89.163.146.49'])
     - Connection:     [Errno 111] Connection refused

   LR access: ERROR
   - ERROR: Fail to verify the connection

This check allows you to configure database-related information and an external database for Unravel.

-- Database configuration
 Configure an external database? (y/n) [No]:
 ##If you answer “No”, Unravel will use an Unravel managed database.
 ## If you answer “Yes”, you are further prompted for database information and test connectivity to that database.
 ##If you have answered “No” for the external database, you are further prompted to confirm if you want to use MySQL or MariaDB.

 Will you be using an Unravel managed MySQL or MariaDB? (y/n) [No]: 
 ##If you answer “No”,  the PostgreSQL bundled with Unravel is used.
 ##If you answer “Yes”, the “Extra packages” section searches for the required MySQL/MariaDB server tarball.

 Will Unravel connect to a MySQL or MariaDB database (ex: hive metastore) ? (y/n) [No]: 
 ##If you answer “Yes”, the “Extra packages” section searches for the required jdbc drivers.

The Extra packages check shows if you use Unravel managed MySQL/MariaDB or need JDBC drivers. Else, this check is automatically skipped.

-- Extra package location

*** JDBC drivers are required for Unravel managed MySQL or MariaDB.
*** Database software package is required for Unravel managed MySQL or MariaDB.

External package location [None]: /<my-extra-packages>
##This is the path to the directory where the required packages are located.

If the required packages are located, then the following message is shown:

The following packages will be installed:
   Database server: /my-extra-packages/mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz
   JDBC driver:
     - /my-extra-packages/mysql-connector-java-5.1.48.tar.gz

 External package: Ok

If the required packages are not found, then the following error message is showing:

External package: ERROR
 - ERROR: Couldn't find jdbc drivers in /my-extra-packages
 - ERROR: Looked for:
   mysql-connector-java-*.tar.gz
   mysql-connector-java-*.jar
   mariadb-java-client-*.jar
 - ERROR: Couldn't find database server package in /my-extra-packages
 - ERROR: Looked for:
   mysql-*-linux-glibc2.12-x86_64.tar.gz
   mariadb-*-linux-x86_64.tar.gz

This check allows you to add root and intermediate certificates to validate the trust chain to establish the connection using TLS. Currently, only pem files are supported.

-- TLS certificate trustchain
  Add trusted certificates? (y/n) [No]:  
  ##If you answer “No”, certificates will not be added.
  ##If you answer “Yes”, All the certificates found at the specified location are imported. Wildcards can be used.

This check allows you to specify a cluster manager (Ambari or Cloudera Manager) to configure Unravel automatically.

-- Hadoop cluster manager (Ambari or Cloudera Manager only)
  
  Configure a cluster manager? (y/n) [No]: 
  ##If you answer “Yes”, you are prompted for the full URL and credentials to test the connection.

This check allows you to configure and test HTTPS for the unravel UI. This check prompts you for certificate, key, password, and hostname details that are used to access Unravel.

-- TLS configuration

The information provided is verified for the following:

This check allows you to set the Unravel UI port and verify the connectivity.

-- Unravel default port
  
  Port number (integer) [3000]: 

  Do you want to test if the port is accessible? (y/n) [Yes]: 
    
  This will open port 3000 and listen for connection for 120 seconds.
  Use your browser to test if the Unravel UI will be accessible on that port.
    
  We have detected the following hostnames:
  - some.host.example
    
 Browse to: http://some.host.example:3000
    
 ATTENTION: This address is an example. You should test with the URL that will be used to access Unravel.

A connection on port 3000 is tried and established. If the connection is successful, Unravel Port Test: OK is shown on the browser, and Unravel port: Reached is shown on the server.

This check allows you to set a custom data directory and verify the access if the directories exist. You will always find the software location where you deploy the Unravel binaries. In this check, only the space and access are tested. That data location that you have configured will be used.

-- Unravel directories

  Software [/opt/unravel]: 

  Data [/opt/unravel/data]: 

  Directories: ERROR
  - OK: 33 GB of free disk space for software.
  - ERROR: SYSH0026: Space for data 33 GB is low, recommended minimum is 100 GB.

This check allows you to configure and test email. You are prompted for host and credentials, and the following items are tested:

-- Mail server (SMTP) configuration

This option allows you to run the full precheck using some of the provided information. Additional tests like user limits, CPU, and memory are run this way.

-- Full precheck