1. Introduction

This guide is intended for administrators planning to set up a Techila Virtual Server in their Techila Distributed Computing Engine (TDCE) environment. If you are unfamiliar with the terminology or theory on how the TDCE system functions refer to Introduction to Techila Distributed Computing Engine for details. Please note that paths and screen captures presented in this document may differ from your system.

The structure of this document is as follows:

Preparation contains a list of prerequisites that must be met before proceeding with the Techila Virtual Server installation.

Preparing the Installation Packages contains steps for preparing the installation packages containing the Techila Virtual Server installation files and the Techila License file. These files will be required later in the installation process. After performing the steps described in this Chapter, you should have access to all required files used in the installation.

Deploying the Techila Virtual Server contains all the necessary steps for configuring the Techila Virtual Server. The configuration involves deploying the virtual machine to VMware ESXi by using the vSphere Client. Instructions are also provided for installing the Open VM Tools package and for adjusting the time zone of the Techila Virtual Server. After performing the steps described in this Chapter, you should be able to log in to the Techila Web Interface.

Updating the Techila License contains instructions for uploading the Techila License file to the Techila Virtual Server. A valid Techila License is required to perform computations in the TDCE environment. After performing the steps described in this Chapter you can continue by adding Techila Workers and End-Users to the TDCE system.

Adding Techila Workers shortly introduces how to add Techila Workers to the TDCE system. More thorough instructions are provided in the document Techila Distributed Computing Engine Administration Guide and in the operating system specific Techila Worker installation guides.

Adding End-Users contains step-by-step instructions on how you can add your first End-User to the Techila system.

Creating a Test Project contains instructions on how you can create a test Project using the End-User Key created during the process described in Adding End-Users.

Creating Runtime Bundles introduces the concept of Runtime Bundles, which are used if you plan on using MATLAB, R, Python or Perl in your TDCE environment.

Appendix contains a collection of useful information such as login credentials to the Techila Web Interface, the location and password Master Administrator Keystore and the login credentials of the techila-admin user for the Techila Virtual Server.

2. Preparation

Before proceeding, please verify that you have:

  • Techila Virtual Server installation file

  • Techila License package

If you do not have Techila Virtual Server installation file, please download it from Techila Extranet and save the file to an easily accessible location.

If you do not have access to Techila Extranet, please contact Techila Technologies to request for Techila Extranet access.

If you do not have Techila License package, please contact Techila Technologies.

You will also need to have the following virtualization software product installed on the server you plan on using as the host for the Techila Virtual Server.

  • VMware ESXi

The procedures described in this document have been tested with VMware ESXi 5.0 Other versions of the VMware ESXi software may also be compatible, but full functionality is not guaranteed.

In addition, you will also need the following software for deploying and configuring the Techila Virtual Server.

  • VMware vSphere Client

2.1. Master Administrator Key Practices

Please refer to Techila Distributed Computing Engine Administration Guide for details about Master Administrator Key and related recommended practices.

3. Preparing the Installation Packages

This Chapter contains instructions on preparing the Techila Virtual Server installation file and Techila License package.

3.1. Preparing the Techila Virtual Server Installation Package

Locate the Techila Virtual Server installation file. In the figure below, a Techila Virtual Server installation file is located in C:\techilavm. This file will need to be stored in a location that can be accessed when using the vSphere Client to deploy the Techila Virtual Server to the ESXi environment.

image006
Figure 1. The Techila Virtual Server installation file. The file name also contains a timestamp, which contains information on when the package was created. This timestamp might be different in your package.

3.2. Extracting the Techila License Package

  1. Locate the Techila License package. In the figure below, a Techila License package is located in C:\Techilalicense.

    image007
    Figure 2. The Techila License is delivered as a ZIP file.
  2. Extract the Techila License package to a location that can be accessed when uploading the Techila License. After extraction, a Techila License file will be available as illustrated below. This file will be uploaded to the Techila Virtual Server later in the installation process.

    image008
    Figure 3. A Techila License file can be recognized from the .license suffix.

4. Deploying the Techila Virtual Server

  1. Launch the VMware vSphere Client. The login window will be displayed prompting for the host IP address and login credentials.

    image009
    Figure 4. The VMware vSphere Client login screen.
  2. Enter your ESXi host address and your login credentials. Click the Login button to login.

    image010
    Figure 5. Entering ESXi host network address and login credentials. In this example, the connection would be established to IP address 10.50.1.42 as the user root.
  3. After logging in, click File and click on the Deploy OVF Template…​ menu item.

    image011
    Figure 6. Choosing the Deploy OVF Template menu item.
  4. After clicking on the menu item, the Deploy OVF Template window will be displayed. Click the Browse button.

    image012
    Figure 7. The initial view before any OVF templates have been selected.
  5. After clicking the Browse button a file dialog window will be displayed. Navigate to the directory where you extracted the files in the Techila Virtual Server package. Select the file Techila Virtual Server installation file (.ova suffix) and click the Open button.

    image013
    Figure 8. Selecting the TechilaVM.ova file.
  6. The view will switch back to the Deploy OVF Template window and the location of the .ova file you chose should now be visible in the text field as shown below. Click the Next button to continue.

    image014
    Figure 9. The path of the ova file should be visible
  7. A window containing OVF template details will be displayed. Click Next to continue.

    image015
    Figure 10. The OVF Template Details window.
  8. A window prompting for the name of the virtual machine will be displayed. If you wish to modify the name of the virtual machine, replace the default name with a name of your choosing. Click Next to continue.

    image016
    Figure 11. Specifying the name of the Techila Virtual Server.
  9. A window prompting for format of the virtual disks will be displayed, depending on your host system specifications either choose thin or thick provisioning. After you have selected the format, click Next to continue.

    image017
    Figure 12. Choosing the disk format type.
  10. A windows prompting for network mapping will be displayed. Choose which network you want to use and click Next to continue.

    network
    Figure 13. Choosing the network.
  11. A window containing the deployment settings will be displayed. Click Finish to deploy the Techila Virtual Server.

    image018
    Figure 14. The Techila Virtual Server deployment settings.
  12. A deployment progress indicator will be displayed. Depending on the network bandwidth in your environment, the deployment process can take several minutes.

    image019
    Figure 15. Deployment progress indicator.
  13. After the deployment process has been completed, a message will be displayed indicating a successful deployment. Click Close.

    image020
    Figure 16. Notification of a successful Techila Virtual Server deployment
  14. Return to the VMware vSphere Client. Click the Edit Settings icon to check the settings of the Techila Virtual Server and modify values according to your requirements.

    image021
    Figure 17. Edit the settings of the virtual machine.

    Typical settings that might need modifications are:

    • Number of CPU cores

    • Amount of RAM

    • Size of the data hard disk (hard disk 2)

      image022
      Figure 18. Modify the virtual machine properties according to your specifications.

      Note! Modifying the size of the data hard disk (Hard disk 2) must be done before you power on the Techila Virtual Server for the first time. System hard disk (Hard disk 1) size cannot be changed. See Modifying the Size of the Data Hard Disk for information on how to modify the data hard disk size before powering on the Techila Virtual Server

      The number of CPU cores and amount of RAM can also be modified after starting the Techila Virtual Server.

      After modifying the settings, click the OK button and close the configuration window.

  15. After configuring the virtual machine properties, you can power on the Techila Virtual Server. Select the virtual machine and click the Power on button located in the Summary tab to start it.

    image023
    Figure 19. Powering on the Techila Virtual Server.
  16. After powering on the virtual machine, open the right-click menu for the Techila Virtual Server and select Open Console from the menu.

    image024
    Figure 20. The Open Console menu item can be used to display the console of the Techila Virtual Server.
  17. The console for the Techila Virtual Server will be displayed, which will contain information on the startup process. The startup process will take several minutes.

    After the startup process has completed, the Techila Virtual Server will be operational. A login prompt will also be displayed, which can be used to login to the Techila Virtual Server.

  18. Log in by using the login credentials shown below:

    Login: techila-admin
    Password: eizolee0

    Note! By default, SSH connections will be allowed from all IP addresses unless the Techila Server has been isolated to a separate network.

    Note! Software fail2ban is installed on the Techila Server. This software will ban IP address after six failed attempts. Ban is 600 seconds.

    image025
    Figure 21. After logging in, important information on the Techila Virtual Server will be displayed.

    Note! It is strongly recommended that you change the password used to login to the Techila Virtual Server before proceeding. The password can be changed with the passwd command.

    The vSphere Client should display the IP-address of the Techila Virtual Server under the General category. Note! The displayed IP-address will be needed later when adding Techila Workers to the Techila Distributed Computing Engine (TDCE) environment and when configuring the techila_settings.ini file to connect to the Techila Server.

    image026
    Figure 22. The IP address of the Techila Server will be visible in the Summary tab. In this example the IP Address of the Techila Server is 10.50.1.187.

    The Techila Virtual Server is now operational.

  19. Optional If you wish to adjust the Techila Server time, please use the command shown below to select an appropriate time-zone.

    sudo dpkg-reconfigure tzdata
  20. Optional If you wish to change the configured Debian mirror site used for operating system updates, please follow instructions described on the following web site:

  21. Optional If you wish to change the Techila Server firewall configuration to only allow connections from a specific IP address range, please follow instructions in Configuring the Techila Server Firewall Note! It is recommended that the firewall is configured to only allow SSH connections from IP addresses used by Techila Administrators

  22. Log out from the Techila Virtual Server by using the command shown below:

    exit

Please continue by Updating the Techila License.

5. Updating the Techila License

This Chapter contains instructions on how to update the license of your Techila Virtual Server. If you do not have access to a Techila License, please contact Techila Technologies. Information on updating the Techila License can also be found in Techila Distributed Computing Engine Administration Guide.

Note! Certain Techila License types require access to Internet based Techila License Server TCP port 80 (HTTP). The license server address will be delivered together with the license file. If no connection can be established, the Techila Server will stop assigning new Jobs to Techila Workers after a certain time period (24 hours). Techila License files that require a connection have the following XML element:

<statsurl>...</statsurl>
  1. Launch your web browser and connect to the Techila Web Interface by entering the network address of the Techila Server in the address bar of the web browser as shown below. The notation <TechilaServerNetworkAddress> should be replaced with the IP address/hostname of the Techila Server that is visible in the summary tab of the vSphere Client.

    https://<TechilaServerNetworkAddress>
  2. Depending on your web browser settings, you may receive a security warning. You can ignore this security warning and continue connecting to the Techila Web Interface

  3. The Techila Web Interface will prompt you for user credentials. Enter the following login credentials to access the Techila Web Interface with administrative access:

    Login: admin
    Password: adminpass

  4. Click the LOGIN button to log in.

    image027
    Figure 23. The Techila Web Interface Login page.
  5. After logging in, your browser will be redirected to the Status Page as illustrated below. Notice that the "Registered to" field contains the value "Unknown" indicating no Techila License is available.

    image028
    Figure 24. View when no Techila Licenses have been uploaded.
  6. Navigate to the "Uploads" page by clicking Admin → Uploads. Click the Browse.. button to open a file dialog window that can be used to select the Techila License file.

    image029
    Figure 25. Opening the file dialog window that can be used to select the Techila License file.
  7. Using the file dialog window, select the Techila License file. This file should be located in the directory you extracted the Techila License package to in Extracting the Techila License Package. After selecting the file, click the Open button.

    image030
    Figure 26. Selecting the Techila License file.
  8. The Techila License file you selected will now be visible in the text field as illustrated below. Click the UPLOAD button to upload the Techila License to the Techila Server.

    image031
    Figure 27. Clicking the UPLOAD button will transfer the Techila License to the Techila Server.
  9. After the upload process is completed, the Techila License will be listed in the Upload Directory table. Tick the checkbox (under the APPROVE button) and click the APPROVE button to approve the License.

    image032
    Figure 28. Tick the checkbox and approve the Techila License by clicking the APPROVE button.
  10. Click the Status page. The Status page will display the Techila License information in the Server Registration Info table as shown below.

    image033
    Figure 29. After uploading the Techila License, the new license information will be visible in the Server Registration Info table on the Status page

Congratulations, your Techila Virtual Server is now ready for use! Please continue by Adding Techila Workers.

6. Adding Techila Workers

Before End-Users can run computational Projects in the Techila Distributed Computing Engine (TDCE) environment, Techila Workers will need to be added to the TDCE environment, and their status needs to be set to "trusted".

Note! In the latest version of the Techila Virtual Server, the Techila Worker Key will be automatically trusted by the Techila Server. If you are using an older version of the Techila Virtual Server, the status of the Techila Worker Key needs to be set to "trusted" by using the Techila Web Interface (Admin ( Keys ( Worker Keys). If you wish to disable automatic trusting, please see instructions in Configuring a Static IP Address for the Techila Server.

Please see Techila Distributed Computing Engine Administration Guide for more detailed instructions on how to install a Techila Worker

Installation instructions for installing the Techila Worker software on different operating systems can be found in the following documents:

Please continue by Adding End-Users.

7. Adding End-Users

The following procedure describes how you can add your first End-User to the Techila Distributed Computing Engine (TDCE) environment and run a test computational Project.

Note! The Techila Server IP used in the examples in this chapter is 10.50.1.106. Replace this IP address with the IP address of your Techila Server when executing commands.

  1. Establish an SSH connection to the Techila Server. When establishing the connection use techila-admin as the username and eizolee0 as the password.

    cli1
  2. The techila_adduser.sh script located in the scripts directory can be used to add new End-Users to the TDCE environment.

    When running the script, define the following parameters:

    • User name (inside quotation marks)

    • User login

    • User password

      The example command below could be used to add a user named Demo User with login demouser and password strongpassword. The output of this script is illustrated in the screenshot below. The

      cli2
  3. After the command has been executed, the new End-User keystore file will be located in the userkeys directory. There should also be a matching Techila Account visible in the Techila Web Interface, in the End-Users page.

    cli3
  4. Next, you can transfer the keystore file from the Techila Server to the computer you plan on installing the Techila SDK on and using for testing. The keystore file can be transferred via scp using the same credentials you used to establish the SSH connection.

    In the screenshot below the demouser.jks file is copied from the Techila Server to C:\temp.

    cli4
  5. Next steps will include downloading and extracting the Techila SDK to the same machine where you transferred the keystore to and running a test project. If you have already downloaded the Techila SDK (TechilaSDK.zip), you can skip the download steps.

    If you have not downloaded the Techila SDK, please start by loging in to the Techila Extranet located at:

  6. Click on the End-User Downloads menu item on the right side of the page

  7. Click on the Latest Techila SDK Download link

    image034
    Figure 30. The Techila SDK can be downloaded from the End-User Downloads section in the Techila Extranet
  8. Download the Techila SDK by clicking the Agree and Download button located below the EULA.

    image035
    Figure 31. Clicking the highlighted button will download the Techila SDK.
  9. After clicking on the link, a file download dialog box will be displayed. Choose Save File and click OK to save the file to your computer.

    image036
    Figure 32. Save the TechilaSDK.zip file to your computer.
  10. After the download has finished, extract the TechilaSDK.zip file to your computer.

    image037
    Figure 33. Extracting the TechilaSDK.zip file.
  11. Extracting the zip-file will create a directory named techila which has several subfolders as shown below.

    image038
    Figure 34. Contents of the techila directory.
  12. At this point you should have both the Techila SDK and the keystore created earlier on the same machine. The Techila SDK root directory is at C:\techila and the keystore file is in C:\temp\demouser.jks.

    Next, move the C:\temp\demouser.jks file to C:\techila\demouser.jks.

    After this, the C:\techila folder should resemble the one shown below.

    tec1
  13. Rename the techila_settings.ini.template to techila_settings.ini.

    tec2
  14. Open the techila_settings.ini with a text editor and edit the values of hostname and keystore parameters. Replace the hostname value with the IP address of your Techila Server. Edit the keystore value so it points to your keystore file. Save the changes.

    tec3
  15. You have now configured the Techila SDK. Next, you can run a command line command that tests network connectivity between the Techila SDK the Techila Server.

    You can test network connectivity with the following command:

    java -jar C:\techila\lib\techila.jar testsession

    When prompted, enter the password of your keystore. In this example flow the password was strongpassword.

    tec4
  16. After a successful connection test the output should resemble the one illustrated below. Next, you can continue with Creating a Test Project

    tec5

8. Creating a Test Project

This Chapter contains a walkthrough how you can create a simple test Project for testing purposes by using the End-User Key created in Adding End-Users.

Note! In order for the test Project to be completed successfully, at least one Techila Worker with a Microsoft Windows or Linux operating system must be available. At least one Techila Worker also must be in the Running state. The statuses of active Techila Workers can be viewed in the Techila Web Interface in the Workers ( All Workers page. The screenshot below illustrates a valid test environment.

image062
Figure 35. Techila Workers with the Running status are highlighted with green.

Note! The paths used in the example commands in this chapter assume that the path to your Techila SDK techila directory is C:\techila. If the path is different on your machine, please modify the paths accordingly.

  1. Launch a command prompt/terminal and cd into the C:\techila\examples\CLI\Tutorial\1_distribution.

    cd C:\techila\examples\CLI\Tutorial\1_distribution
  2. Create the test Project using command:

    java -jar C:/techila/lib/techila.jar read < commands

    When prompted, enter your keystore password.

    tec6
    Figure 36. The test Project can be created by running one of the Techila Command Line Interface examples. More information on the example material under the CLI folder can be found in the document Techila Distributed Computing Engine with Command Line Interface.
  3. After entering the password, the test Project will be created. Information on the Project will be displayed in the command prompt and should resemble the one shown below.

    image066
    Figure 37. Information on the Project will be displayed in the command prompt. The test Project is computationally very light, which means that the Project will be completed in a very short amount of time.

    Congratulations! You have successfully completed a computational Project in the Techila Distributed Computing Engine environment.

9. Creating Runtime Bundles

Language-specific Runtime Bundles (a subset of Library Bundles) are required to perform computations on Techila Workers with different programming languages. Runtime Bundles will be required if End-Users in your Techila Distributed Computing Engine environment use the following programming languages:

  • MATLAB

  • Perl

  • R

  • Python

Information on how to create Runtime Bundles can be found in the document Bundle Guide.

10. Appendix

10.1. Techila Web Interface Login Credentials

The login credentials for the Techila Web Interface are shown below:

Techila Web Interface

Login

admin

Password

adminpass

Note! It is strongly recommended that you change the default password as soon as possible.

10.2. Master Administrator Keystore Information

Information on the Master Administrator keystore is shown below:

Master Administrator keystore

Location of the Master Administrator keystore

/home/techila-admin/admin/admin.jks

Master Administrator Key alias

admin

Master Administrator Key password

adminpass

Note! It is strongly recommended that you change the default password as soon as possible.

10.3. End-User Keystore Information

Information on the End-User keystore is shown below:

End-User keystore

Location of the End-User keystore

/home/techila-admin/userkeys/subadmin1.jks

End-User Key alias

admin

End-User Key password

adminpass

Note! It is strongly recommended that you change the default password as soon as possible.

10.4. User techila-admin Login Credentials

The login credentials for the user techila-admin user on the Techila Virtual Server are shown below:

Techila Virtual Server

Login

techila-admin

Password

eizolee0

Note! It is strongly recommended that you change the default password as soon as possible.

10.5. Configuring a Static IP Address for the Techila Server

By default, the Techila Server is configured to obtain the IP address from the DHCP server. This Chapter contains instructions on how to configure a static IP address for the Techila Server.

Procedure

  1. Log in to the Techila Server as techila-admin

  2. Open file /etc/network/interfaces with a text editor (as root via sudo) e.g. by using command:

    sudo nano /etc/network/interfaces

  3. If needed, remove the lines containing the dhcp configuration and replace with the following parameters:

    iface eth0 inet static
      address <IP address of the Techila Server>
      netmask <netmask value>
      broadcast <broadcast address>
      network <network address>
      gateway <gateway address>

    Below is an example static IP address configuration for eth0.

    iface eth0 inet static
      address 10.50.1.3
      netmask 255.255.255.0
      broadcast 10.50.1.255
      network 10.50.1.0
      gateway 10.50.1.4

    More information on configuring the network address of a Debian operating system can be found from the following address:

  4. Save changes and exit the editor.

  5. Reboot the Techila Server with command:

    sudo reboot

10.6. Disabling the Automatic Trusting of Techila Worker Keys

The following procedure describes how you can disable the automatic trusting of Techila Worker Keys.

  1. Log in as an administrator to the Techila Web Interface

  2. Click Admin

  3. Click Advanced

  4. Click Config

  5. Scroll down the page and locate the table titled Techila Server Security X509DB

  6. Uncheck the checkbox on following line Workers: Trust Keys Automatically

  7. Click the Submit button

10.7. Modifying the Size of the Data Hard Disk

This Chapter contains instructions on how to modify the size of the data hard disk before powering on the Techila Virtual Server.

Note! The procedures described in this Chapter cannot be applied if you have already started the Techila Virtual Server.

  1. Select the Techila Virtual Server and click the Edit Settings button.

    image067
    Figure 38. Open the virtual machine properties window by clicking the Edit Settings button.
  2. Select "Hard disk 2" and delete it by clicking the Remove button.

    image068
    Figure 39. Select "Hard disk 2" and click the Remove button.
  3. Mark files to be removed from the disk in the Removal Options section. Click the Add…​ button to add a new hard disk.

    image069
    Figure 40. Mark the old hard disk file to be removed and click the Add…​ button to add a new data hard disk.
  4. A new "Add Hardware" window will be displayed that can be used to add the new data hard disk. Select Hard Disk as the device type and click Next.

    image070
    Figure 41. Selecting the Device Type.
  5. Select Create a new virtual disk and click Next.

    image071
    Figure 42. Specifying that a new hard disk should be created.
  6. Specify the size of the new hard disk and other properties. Click Next to continue.

    image072
    Figure 43. Specify the properties of the new data hard disk. In this example, the size has been set to 24 GB and Disk Provisioning has been set to "Thin".
  7. In the Advanced Options view, ensure that the Virtual Device Node is set to SCSI (0:1). Click Next to continue.

    image073
    Figure 44. Ensure that the Virtual Device Node field matches the one illustrated here.
  8. Create the hard disk by clicking the Finish button. The view will change back to the virtual machine properties view and should resemble the one shown below. Click OK to close the virtual machine properties view.

    image074
    Figure 45. After adding the new hard disk, click OK to close the virtual machine properties view.

10.8. Configuring the Techila Server Firewall

The Techila Server firewall configuration is located in the following directory:

  • /etc/firewall/

This directory contains the following firewall configuration files:

  • config_allow_port20001

  • config_allow_port20002

  • config_allow_port25001

  • config_allow_port443

  • config_allow_port80

  • config_allow_snmp

  • config_allow_ssh

Each of these files contains the allowed IP address range definition in CIDR format for the port specified in the file name. Please see below table for a description of the files.

File Default Allowed IP Address Range (CIDR) Description

config_allow_port20001

0/0

Defines IP range from where Signal Channel connections can be established from. Connections are established by Techila Techila Workers

config_allow_port20002

0/0

Defines IP range from where Data Channel connections can be established from. Connections are established by Techila Workers

config_allow_port25001

0/0

Defines IP range from where Management Channel connection can be established from. Connections established by End-Users via Techila SDK.

config_allow_port443

0/0

Defines IP range from where Techila Web Interface can be accessed from. Connections established by End-Users and Administrators via web browser using https protocol.

config_allow_port80

No external connections allowed.

Defines IP range from where http requests can be performed. Port not used in the current Techila Virtual Server.

config_allow_snmp

No external connections allowed.

Defines IP range from where SNMP connections can be established from using UDP port 161. Default only allows connections from localhost.

config_allow_ssh

0/0

Defines IP range from where SSH connections can be established from using TCP port 22. Connections established by Techila Administrators.

After modifying the firewall configuration files described above, the changes will need to be applied by executing the firewall configuration update script. The location of the firewall configuration script is:

  • /etc/firewall/iptables-firewall.sh

Note! When executing the configuration update script, your current working directory must be set to /etc/firewall

The example procedure in this Chapter illustrates how the Techila Server firewall can be configured to only allow SSH connections from a specific IP address range.

The procedure is similar for all port configurations, only the file names will be different. Please replace the filenames to match the firewall configuration you are modifying.

  1. Establish a SSH connection to the Techila Server. When prompted for login credentials, use login credentials described in User techila-admin Login Credentials.

  2. Change your current working directory to directory /etc/firewall.

    cd /etc/firewall
  3. Open the file config_allow_ssh with a text editor using sudo.

    sudo nano config_allow_ssh
  4. When prompted for the techila-admin password, enter the password defined in User techila-admin Login Credentials.

  5. Replace the line 0/0 with the IP address CIDR range of your choosing. In the example below, the IP range has been changed to 10.50.1.0/24.

    image075
    Figure 46. Specifying the IP address range using CIDR format.
  6. Save the changes that you made to the file and exit the text editor.

  7. Update the changes to the firewall by executing the script iptables-ssh.sh using the command shown below:

    sudo ./iptables-ssh.sh
  8. After executing the command, information about the new IP address range should be displayed as shown below.

    image076
    Figure 47. After executing the configuration update script, the new allowed IP address range will be displayed.