Installing Cloudera Navigator Encrypt

See Data at Rest Encryption Requirements for more information about encryption and Navigator Encrypt requirements.

You must create an internal repository to install or upgrade Navigator Encrypt. For instructions on creating internal repositories (including Cloudera Manager, CDH, and Cloudera Navigator encryption components), see Creating and Using a Package Repository for Cloudera Manager.

1. Install the Cloudera Repository

   Add the internal repository you created. See Modifying Clients to Find the Repository for more information.

   Import the GPG key by running the following command:

   $ sudo rpm --import http://archive.gazzang.com/gpg_gazzang.asc

2. Install Kernel Libraries

   For Navigator Encrypt to run as a kernel module, you must download and install the kernel development headers. Each kernel module is compiled specifically for the underlying kernel version. Running as a kernel module allows Navigator Encrypt to provide high performance and completely transparency to user-space applications.

   To determine your current kernel version, run uname -r.

   To install the development headers for your current kernel version, run:

   $ sudo yum install kernel-headers-$(uname -r) kernel-devel-$(uname -r)

   For OL with the Unbreakable Enterprise Kernel (UEK), run:

   $ sudo yum install kernel-uek-headers-$(uname -r) kernel-uek-devel-$(uname -r)

   If yum cannot find these packages, it displays an error similar to the following:

   Unable to locate package <packagename>.

   In this case, do one of the following to proceed:

   • Find and install the kernel headers package by using a tool like RPM Pbone .
   • Upgrade your kernel to the latest version. If you upgrade the kernel, you must reboot after upgrading and select the kernel from the grub menu to make it active.
3. (RHEL or CentOS Only) Install dkms
   Because of a broken dependency in all versions of RHEL or CentOS, you must manually install the dkms package:

   $ sudo yum install http://repository.it4i.cz/mirrors/repoforge/redhat/el6/en/x86_64/rpmforge/RPMS/dkms-2.1.1.2-1.el6.rf.noarch.rpm

4. Install Navigator Encrypt
   Install the Navigator Encrypt client using the yum package manager:

   $ sudo yum install navencrypt

   If you attempt to install Navigator Encrypt with incorrect or missing kernel headers, you see a message like the following:

   Building navencryptfs 3.8.0 DKMS kernel module...
   
   #################### BUILDING ERROR ####################
   
   
   
   Creating symlink /var/lib/dkms/navencryptfs/3.8.0/source ->
                    /usr/src/navencryptfs-3.8.0
   
   DKMS: add completed.
   Error! echo
   Your kernel headers for kernel 3.10.0-229.4.2.el7.x86_64 cannot be found at
   /lib/modules/3.10.0-229.4.2.el7.x86_64/build or /lib/modules/3.10.0-229.4.2.el7.x86_64/source.
   
   #################### BUILDING ERROR ####################
   
   Failed installation of navencryptfs 3.8.0 DKMS kernel module !

   To recover, see Navigator Encrypt Kernel Module Setup.

1. Install the Cloudera Repository

   Add the internal repository you created. See Modifying Clients to Find the Repository for more information.

   Import the GPG key by running the following command:

   $ sudo rpm --import http://archive.gazzang.com/gpg_gazzang.asc

2. Install NTP
   The Network Time Protocol (NTP) service synchronizes system time. Cloudera recommends using NTP to ensure that timestamps in system logs, cryptographic signatures, and other auditable events are consistent across systems. Install and start NTP with the following commands:

   $ sudo zypper install ntp
   # /etc/init.d/ntp start

3. Install the Kernel Module Package and Navigator Encrypt Client

   Install the kernel module package (KMP) and Navigator Encrypt client with zypper:

   $ sudo zypper install cloudera-navencryptfs-kmp-<kernel_flavor>
   $ sudo zypper install navencrypt

   Replace <kernel_flavor> with the kernel flavor for your system. Navigator Encrypt supports the default, xen, and ec2 kernel flavors.

4. Enable Unsupported Modules
   Edit /etc/modprobe.d/unsupported-modules and set allow_unsupported_modules to 1. For example:

   #
   # Every kernel module has a flag 'supported'. If this flag is not set loading
   # this module will taint your kernel. You will not get much help with a kernel
   # problem if your kernel is marked as tainted. In this case you firstly have
   # to avoid loading of unsupported modules.
   #
   # Setting allow_unsupported_modules 1 enables loading of unsupported modules
   # by modprobe, setting allow_unsupported_modules 0 disables it. This can
   # be overridden using the --allow-unsupported-modules command line switch.
   allow_unsupported_modules 1

1. Install the Cloudera Repository
   Add the internal repository you created. See Modifying Clients to Find the Repository for more information.

   • Ubuntu

     $ echo "deb http://repo.example.com/path/to/ubuntu/stable $DISTRIB_CODENAME main" | sudo tee -a /etc/apt/sources.list

   • Debian

     $ echo "deb http://repo.example.com/path/to/debian/stable $DISTRIB_CODENAME main" | sudo tee -a /etc/apt/sources.list

   Import the GPG key by running the following command:

   $ wget -O - http://archive.gazzang.com/gpg_gazzang.asc | apt-key add -

   Update the repository index with apt-get update.

2. Install NTP
   The Network Time Protocol (NTP) service synchronizes system time. Cloudera recommends using NTP to ensure that timestamps in system logs, cryptographic signatures, and other auditable events are consistent across systems. Install and start NTP with the following commands:

   $ sudo apt-get install ntp
   $ sudo /etc/init.d/ntp start

3. Install Kernel Headers
   Determine your kernel version by running uname -r, and install the appropriate headers:

   $ sudo apt-get install linux-headers-$(uname -r)

4. Install the Navigator Encrypt Client
   Install Navigator Encrypt:

   $ sudo apt-get install navencrypt

The Advanced Encryption Standard New Instructions (AES-NI) instruction set is designed to improve the speed of encryption and decryption using AES. Some newer processors come with AES-NI, which can be enabled on a per-server basis.

$ grep -o aes /proc/cpuinfo

$ sudo lsmod | grep aesni

If the CPU supports AES-NI but the kernel module is not loaded, see your operating system documentation for instructions on installing the aesni-intel module.

$ sudo rngd --no-tpm=1 -o /dev/random

For improved performance, Cloudera recommends configuring Navigator Encrypt to read directly from /dev/random instead of /dev/urandom.

To configure Navigator Encrypt to use /dev/random as an entropy source, add --use-random to the navencrypt-prepare command when you are setting up Navigator Encrypt.