Verifying candidate host resources

Use this procedure to determine whether a host's hardware resources and operating system are sufficient to serve as a Control Center delegate host. Perform this procedure on each candidate delegate host in your deployment.
  1. Log in to the candidate host as root, or as a user with superuser privileges.
  2. Verify that the host implements the 64-bit version of the x86 instruction set.
    uname -m
    • If the output is x86_64, the architecture is 64-bit. Proceed to the next step
    • If the output is i386/i486/i586/i686, the architecture is 32-bit. Stop this procedure and select a different host.
  3. Determine whether the installed operating system release is supported.
    cat /etc/redhat-release
    • If the result includes 7.1, 7.2, or 7.3 proceed to the next step.
    • If the result does not include 7.1, 7.2, or 7.3, select a different host, and then start this procedure again.
  4. Determine whether the CPU resources are sufficient.
    1. Display the total number of CPU cores.
      cat /proc/cpuinfo | grep -Ec '^core id'
    2. Compare the available resources with the requirements for a Control Center master host.
      For more information, refer to the Control Center Planning Guide.
  5. Determine whether the CPU resources support the AES instruction set.
    cat /proc/cpuinfo | grep -Ec '^flags.*aes'
    For optimal performance, the result of the preceding commands must match the total number of CPU resources available on the host. If the result is 0, performance is severely degraded.

    If the result is 0 and the candidate host is a virtual machine, the managing hypervisor may be configured in Hyper-V compatibility mode. Check the setting and disable it, if possible, or select a different host.

  6. Determine whether the available memory and swap is sufficient.
    1. Display the available memory.
      free -h
    2. Compare the available memory with the amount required for a delegate host in your deployment.
      For more information, refer to the Control Center Planning Guide.
  7. Ensure the host has a persistent numeric ID.
    Each host in a Control Center cluster must have a unique host ID, and the ID must be persistent (not change when the host reboots).
    test -f /etc/hostid || genhostid ; hostid
    Record the ID for comparison with other hosts in the cluster.
  8. Verify that name resolution works on this host.
    hostname -i
    If the result is not a valid IPv4 address, add an entry for the host to the network nameserver, or to /etc/hosts.
  9. Add an entry to /etc/hosts for localhost, if necessary.
    1. Determine whether is mapped to localhost.
      grep /etc/hosts | grep localhost
      If the preceding commands return no result, perform the following substep.
    2. Add an entry to /etc/hosts for localhost.
      echo " localhost" >> /etc/hosts
  10. Update the Linux kernel, if necessary.
    1. Determine which kernel version is installed.
      uname -r
      If the result is lower than 3.10.0-327.22.2.el7.x86_64, perform the following substep.
    2. Update the kernel, and then restart the host.
      The following commands require internet access or a local mirror of operating system packages.
      yum makecache fast && yum update -y kernel && reboot