The document summarizes two projects: migrating a Linux infrastructure from RHEL6 to RHEL7, and overhauling a backups infrastructure. For the Linux migration, the tasks included moving infrastructure services, testing applications with development teams, migrating critical servers, managing temporary files differently, installing missing software, and automating startup/shutdown scripts. Sendmail was also replaced with Postfix. For the backups overhaul, older hardware was replaced with new custom servers. The backups infrastructure was migrated from Solaris to Linux, Netbackup was upgraded, and LTO tape drives were replaced with faster LTO-7 drives. Old encryption devices were also replaced.

1. Projects:
Migrating Linux infrastructure from RHEL6 to RHEL7:
As part of migrating our Linux servers from RHEL6 to RHEL7, handled below tasks.
 Migrated Infrastructure services like DNS, DHCP, Rsyslog to RHEL7.
 Worked along with in-house trading/development teams to test their
applications/workflow in RHEL7 and eventually get their servers migrated to RHEL7.
 Migrated servers in DMZ/co-locations which are running critical services.
 Evaluated and moved from tmpwatch to systemd-tmpfiles for managing all the temp
files.
 Installed the missing Perl/Python modules and software packages in RHEL7.
 Wrote a script for handling automatic startup/shutdown of applications during machine
reboot.
As part of this migration, we also moved from Sendmail to postfix as its lot simpler and less
cumbersome to manage.
 Migrated Sendmail server configuration to postfix without any email disruptions.
 Moved all the RHEL7 clients to use Postfix dumb client configuration.
 Implemented Postmulti on the servers so that one single server can handle emails for
multiple domains.
 Wrote a script to monitor various Postfix queues on Linux servers and to alert us so that
we can pro-actively fix the issues.
Backups Infrastructure Overhaul:
Our Backups infrastructure hardware was more than five years old and it was time to upgrade
the hardware/software to ensure that it’s stable/up to-date.
As part of the overhaul:
 Purchased servers with custom hardware based on our requirements keeping in mind
the current usage and future growth.
 Migrated the backups infra from Solaris to Linux and upgraded Netbackup from v6.5 to
v7.7.3.
 Configured LTO-7 drives for the Tape Library to replace the existing LTO-5 drives as it is
faster and LTO-7 Medias are 4X bigger in size.
 Replaced the old encryption devices ‘Netapp LKM/Brocade Encryption Switch’ as they
were EOL (End Of Life) and EOS (End Of Support) and moved to using Netbackup
KMS/Native LTO drive encryption.