Operating system

Any of the following:

• CentOS 7 64 bit x86 with update 3 or any later version of CentOS 7.

• Red Hat Enterprise Linux (RHEL) 7 64 bit x86 with update 3 or any later version through RHEL 8.x.

Points to consider:

• CentOS 8.x is not supported.

• Do not use a CentOS or RHEL Minimal ISO file to install CentOS or RHEL.

• Do not use a CentOS or RHEL LiveCD ISO to install CentOS or RHEL.

• Install CentOS or RHEL by using the Minimal Install installation type option.

  The Minimal Install installation type option is available on the Software Selection page of the CentOS or RHEL installation wizard.

• Do not install any other software packages on the operating system.

  However, an exception is the following third-party antivirus software, which you can install on the operating system:

  CylancePROTECT version 2.1.1564

• Do not install Tomcat on the operating system.

• Installation of Usage Metering Collector on RHEL requires a Red Hat subscription. Without a subscription, the installation can fail. If the installation fails, the following message is displayed notifying you to buy a Red Hat subscription.

  This system was not registered with an entitlement server. You can use subscription manager to register.

• The Yum installation installs the dependent RPMs.

• Usage Metering installs all the required packages.

Usage Metering supports virtualized and bare metal environments.

Hardware specifications

For Usage Metering Collector containing up to 20 Avaya OneCloud™ Subscription systems:

• 8 GB of RAM

• 2 CPU cores such as 2.6GHz Intel Xeon E5 (Sandy Bridge), 2.5 GHz Intel Xeon E5 v2 (Ivy Bridge), or 2.3 GHz Intel Xeon E5 v3 (Haswell)

• 100–GB hard disk

For Usage Metering Collector containing more than 20 Avaya OneCloud™ Subscription systems:

• 16 GB of RAM

• 4 CPU cores such as 2.6GHz Intel Xeon E5 (Sandy Bridge), 2.5 GHz Intel Xeon E5 v2 (Ivy Bridge), or 2.3 GHz Intel Xeon E5 v3 (Haswell)

• 100–GB hard disk

Network specifications

Access to the Avaya OneCloud™ Subscription components and applications.

Usage Metering must have connectivity to the following:

• SAL Gateway (SAL GW)

• SNMP Trap Host.

SAL Gateway must have connectivity to Usage Metering.

Internet access

The SAL Gateway must have access to the public internet.

Additionally:

• Installation of the Usage Metering Collector on CentOS requires unrestricted HTTP and HTTPS access to the public internet, including a Domain Name System (DNS)

• Installation of the Usage Metering Collector on RHEL requires the following:

  • Access to the Red Hat Yum repository.

    For more information, see the Red Hat documentation.

  • Restricted HTTPS access to the public internet.

Time and Time zone

Time:

• The system starts collecting and submitting usage data every day at 3:20 a.m. local time.

• Configure NTP to ensure the time remains correct.

Time zone:

• Set the time zone according to your locale.

• The time zone you set on the system determines the start and stop of each billing day.

• CentOS and RHEL use the tz database of time zones.