NetApp's documentation says that this software is certified to run on RedHat/CentOS 7. So please take a RedHat/CentOS 7 install. Many installs will include things like Postfix (MTA to be able to send out email, such as daily reports) and net-snmp (so that the system can be monitored via SNMP). I consider both of these pieces of software as required for a standard install of RedHat/CentOS. These two packages have a dependency of mariadb-libs.
Now NetApp Cloud Manager requires Internet access not because of operation but because it goes to download additional RPMs. Some of these are packages included in RedHat/CentOS and I was able to work around that by installing them by hand. To determine what is needed, I extracted the install script from the provided installer. Now this install script also wants to download and install from mysql.com the MySQL Community Server instead of using the one provided by RedHat/CentOS.
Because of this it fails with conflicts on mariadb-libs. If this installer insist on using the MySQL Community Server version, it should include it instead of having to download it or provide what to download and install. It also should use the relocate options of RPM to install it into another location and use LDCONFIG to set the library include path.
This whole installer to me is a very sloppy job. An installer should never insist on direct Internet access, it always should provide a way to work around that.
And the answer from NetApp support we have gotten "Deal with it, remove postfix/net-snmp, etc", is not acceptable. At this point we will just have to request a refund of our money and find a different solution for file serving.
Also we for example have connection to AWS via direct connect, so for this instance of Cloud Manager there is no reason to talk directly to the Internet. I have not checked the AWS Linux AMI if it installs by default mariadb-libs in conjunction with Postfix and net-snmp, but we prefer to have Cloud Manager installed on Prem.
Another way for NetApp to provide Cloud Manager would be as a real appliance, i.e. VMware OVA or AWS AMI. Then NetApp can controll what ever packages to install. It would also not require direct Internet access.