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Prerequisites

All commands in this section are for reference in the following scenarios. Change the values based on site requirements.

  • The installation user is omm.
  • The software package is stored in /home/omm/haf-software.
  • The installation directory is /home/omm/haf-install. In this case, the /home/omm/haf-install/haf-host directory is generated after OmniData is installed on the host node, and the /home/omm/haf-install/haf-target directory is generated after OmniData is installed on the offload node.
  • The cgroup subdirectory is omm_haf. For details, see Prerequisites for Installing HAF.

Prerequisites for Installing HAF

Before installing HAF as a common user, perform the following operations as the root user first:

  • Grant the permission for creating scheduled tasks to the current user. Assume that the current user is omm. Run the following command:

    echo "omm" >> /etc/cron.allow

  • To control the CPU and memory used by applications running in HAF, create a cgroup subdirectory for the current user. Assume that the current user is omm and the subdirectory is omm_haf. Run the following commands:

    cd /sys/fs/cgroup/cpu

    mkdir omm_haf

    chown -R omm omm_haf

    cd /sys/fs/cgroup/memory

    mkdir omm_haf

    chown -R omm omm_haf

  • To ensure system security, disable remote login for user omm who installs and runs HAF. That is, set the permission of user omm to nologin.
  • You do not need to perform the preceding operations when installing HAF on host nodes.
  • When using the root user for installation, you do not need to configure a scheduled task, but you need to create subdirectories in /sys/fs/cgroup/cpu and /sys/fs/cgroup/memory.
  • The name of the cgroup subdirectory can be customized. The names of the subdirectories created in /sys/fs/cgroup/cpu and /sys/fs/cgroup/memory must be the same and will be used as the value of the cgroup_dir parameter during HAF installation on offload nodes.