OpenSSH installed manually, if you do not have it installed already as part of a default Linux installation.

Review the system requirements section for a list of minimum package requirements. Use the same operating system kernel and packages on each cluster member node.

• Oracle Linux 7.4 with the Unbreakable Enterprise Kernel 4: 4.1.12-112.16.7.el7uek.x86_64 or later
  Oracle Linux 7.4 with the Unbreakable Enterprise Kernel 5: 4.14.35-1818.1.6.el7uek.x86_64 or later
  Oracle Linux 7.4 with the Red Hat Compatible kernel: 3.10.0-693.5.2.0.1.el7.x86_64 or later
  

• Red Hat Enterprise Linux 7.4: 3.10.0-693.5.2.0.1.el7.x86_64 or later
  

• SUSE Linux Enterprise Server 12 SP3: 4.4.103-92.56-default or later

Review the system requirements section for a list of minimum package requirements.

If you use Oracle Linux, then Oracle recommends that you run an Oracle preinstallation RPM for your Linux release to configure your operating system for Oracle Database and Oracle Grid Infrastructure installations.

Disable Transparent HugePages

Oracle recommends that you disable Transparent HugePages and use standard HugePages for enhanced performance.