Apache Ambari Installation for IBM Power Systems
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Disable SELinux and PackageKit and check the umask Value

  1. You must disable SELinux for the Ambari setup to function. On each host in your cluster,

    setenforce 0

    To permanently disable SELinux set


    in /etc/selinux/config This ensures that SELinux does not turn itself on after you reboot the machine .

  2. UMASK (User Mask or User file creation MASK) sets the default permissions or base permissions granted when a new file or folder is created on a Linux machine. Most Linux distros set 022 as the default umask value. A umask value of 022 grants read, write, execute permissions of 755 for new files or folders. A umask value of 027 grants read, write, execute permissions of 750 for new files or folders.

    Ambari supports umask values of 022 (0022 is functionally equivalent), 027 (0027 is functionally equivalent). These values must be set on all hosts.

    UMASK Examples:

    Setting the umask for your current login session:

    umask 0022

    Checking your current umask:


    Permanently changing the umask for all interactive users:

    echo umask 0022 >> /etc/profile