> [!CAUTION]
> **Caution:** This documentation covers Edge for Private Cloud 4.17.05, which is no longer supported. Google does not provide security patches, bug fixes, or technical support for this version. The current supported version is 4.54.00. See the [Edge for Private Cloud documentation](https://docs.apigee.com/private-cloud/latest/overview) for the current version, or [All versions](https://docs.apigee.com/private-cloud/versions) to compare releases.

*Edge for Private Cloud v. 4.17.05*

> [!NOTE]
> **Note:** The [Installation
> Requirements](https://docs.apigee.com/private-cloud/v4.17.05/installation-requirements) details the installation prerequisites and provides a list of required files to obtain before proceeding with the installation. Ensure that you have reviewed the requirements before beginning the installation process.

## Using a Load Balancer

A production installation of API BaaS uses a load balancer between the API BaaS Portal node
and API BaaS Stack nodes. When configuring the Portal, you specify the IP address or DNS name of
the load balancer, not of the Stack nodes.

As an alternative to a load balancer, you could use round-robin DNS. In this scenario, you
create a DNS entry with multiple A records corresponding to BaaS stack IP addresses. During a DNS
lookup, the DNS server automatically returns A record values in a round robin fashion.

> [!NOTE]
> **Note:** API BaaS testing and development environments can install all components on a single node, or with a single API BaaS Stack node. If your installation uses a single API BaaS Stack node, the load balancer is not required and you can specify the IP address or DNS name of the API BaaS Stack when configuring the Portal.

## Connecting to Cassandra

When installing BaaS, you can choose to connect BaaS and Edge to the same Cassandra cluster,
or create a separate Cassandra cluster for BaaS. Smaller BaaS installations, meaning those with
lower traffic volumes, often share a Cassandra cluster with Edge.

For the high throughput and availability, or to separate Cassandra clusters into different
network zones, Apigee recommends that you use separate Cassandra clusters. Separate clusters
maximize performance if you are experiencing high traffic loads on BaaS.

## Date synchronization

You must have the date/time on all servers synchronized. If not already configured,
'ntpdate' utility could serve this purpose, which verifies whether servers are time
synchronized. You can use "yum install ntp" to install the utility.

## Tomcat security

The API BaaS installer also installs the Apache Tomcat server on all API BaaS Stack nodes,
including the Tomcat administrator UI. The installer leaves the default administrator credentials
unchanged from admin:admin.

If necessary, you can change these credentials as part of securing Tomcat. For more
information, see:

- <https://tomcat.apache.org/tomcat-7.0-doc/manager-howto.html>
- <https://www.owasp.org/index.php/Securing_tomcat>

## Installing BaaS in multiple data centers

You can install API BaaS across multiple data centers. The typical procedure is:

- Install the first data center as described at [API BaaS
  Installation](https://docs.apigee.com/private-cloud/v4.17.05/api-baas-installation).
- Add the second data center to the first as described at [Multiple Data Center Installation for API
  BaaS](https://docs.apigee.com/private-cloud/v4.17.05/multiple-data-center-installation-api-baas).