Cloudera Manager 5.5.0

Cloudera Manager supports the following operating systems:

• RHEL-compatible
  • Red Hat Enterprise Linux and CentOS, 64-bit
    • 5.7
    • 6.4
    • 6.5
    • 6.5 in SE Linux mode
    • 6.6
    • 6.6 in SE Linux mode
    • 6.7
    • 7.1
  • Oracle Enterprise Linux with default kernel and Unbreakable Enterprise Kernel, 64-bit
    • 5.6 (UEK R2)
    • 6.4 (UEK R2)
    • 6.5 (UEK R2, UEK R3)
    • 6.6 (UEK R3)
    • 6.7
    • 7.1

  Important: Cloudera supports RHEL 7 with the following limitations:

  • Only RHEL 7.1 is supported. RHEL 7.0 is not supported.
  • Only a new installation of RHEL 7.1 is supported. Upgrades from RHEL 6 to RHEL 7.1 are not supported. For more information, see Does Red Hat support upgrades between major versions of Red Hat Enterprise Linux?
  • Navigator Encrypt is not supported on RHEL 7.1.

   

• SLES - SUSE Linux Enterprise Server 11, 64-bit. Service Pack 2 or later is required if Cloudera Manager is used to manage CDH 5, and Service Pack 1 or later is required if Cloudera Manager is used to manage CDH 4. If you follow Installation Path A - Automated Installation by Cloudera Manager, the Updates repository must be active to use the embedded PostgreSQL database. The SUSE Linux Enterprise Software Development Kit 11 SP1 is required on hosts running the Cloudera Manager Agents.
• Debian - Wheezy (7.0 and 7.1), Squeeze (6.0) (deprecated), 64-bit
• Ubuntu - Trusty (14.04), Precise (12.04), Lucid (10.04) (deprecated), 64-bit

Note:

• Debian Squeeze and Ubuntu Lucid are supported only for CDH 4.
• Using the same version of the same operating system on all cluster hosts is strongly recommended.

The version of Oracle JDK supported by Cloudera Manager depends on the version of CDH that is being managed. The following table lists the JDK versions supported on a Cloudera Manager 5.5 cluster running the latest CDH 4 and CDH 5. For further information on supported JDK versions for previous versions of Cloudera Manager and CDH, see JDK Compatibility.

Important: There is one exception to the minimum supported and recommended JDK versions in the following table. If Oracle releases a security patch that affects server-side Java before the next minor release of Cloudera products, the Cloudera support policy covers customers using the patch.

Cloudera Manager can install Oracle JDK 1.7.0_67 during installation and upgrade. If you prefer to install the JDK yourself, follow the instructions in Java Development Kit Installation.

The Cloudera Manager Admin Console, which you use to install, configure, manage, and monitor services, supports the following browsers:

• Mozilla Firefox 24 and 31.
• Google Chrome.
• Internet Explorer 9 and higher. Internet Explorer 11 Native Mode.
• Safari 5 and higher.

Cloudera Manager requires several databases. The Cloudera Manager Server stores information about configured services, role assignments, configuration history, commands, users, and running processes in a database of its own. You must also specify a database for the Activity Monitor and Reports Manager roles.

Important: When processes restart, the configuration for each of the services is redeployed using information that is saved in the Cloudera Manager database. If this information is not available, your cluster will not start or function correctly. You must therefore schedule and maintain regular backups of the Cloudera Manager database in order to recover the cluster in the event of the loss of this database. See Backing Up Databases.

The database you use must be configured to support UTF8 character set encoding. The embedded PostgreSQL database that is installed when you follow Installation Path A - Automated Installation by Cloudera Manager automatically provides UTF8 encoding. If you install a custom database, you may need to enable UTF8 encoding. The commands for enabling UTF8 encoding are described in each database topic under Cloudera Manager and Managed Service Data Stores.

After installing a database, upgrade to the latest patch version and apply any other appropriate updates. Available updates may be specific to the operating system on which it is installed.

Cloudera Manager and its supporting services can use the following databases:

• MariaDB 5.5
• MySQL - 5.5 and 5.6
• Oracle 11gR2 and 12c
• PostgreSQL - 9.2, 9.3, and 9.4

Cloudera supports the shipped version of MariaDB, MySQL and PostgreSQL for each supported Linux distribution. Each database is supported for all components in Cloudera Manager and CDH subject to the notes in CDH 4 Supported Databases and CDH 5 Supported Databases.

The following versions of CDH and managed services are supported:

Warning: Cloudera Manager 5 does not support CDH 3 and you cannot upgrade Cloudera Manager 4 to Cloudera Manager 5 if you have a cluster running CDH 3. Therefore, to upgrade CDH 3 clusters to CDH 4 using Cloudera Manager, you must use Cloudera Manager 4.

• CDH 4 and CDH 5. The latest released versions of CDH 4 and CDH 5 are strongly recommended. For information on CDH 4 requirements, see CDH 4 Requirements and Supported Versions. For information on CDH 5 requirements, see CDH 5 Requirements and Supported Versions.
• Cloudera Impala - Cloudera Impala is included with CDH 5. Cloudera Impala 1.2.1 with CDH 4.1.0 or later. For more information on Cloudera Impala requirements with CDH 4, seeCloudera Impala Requirements.
• Cloudera Search - Cloudera Search is included with CDH 5. Cloudera Search 1.2.0 with CDH 4.6.0. For more information on Cloudera Search requirements with CDH 4, see Cloudera Search Requirements.
• Apache Spark - 0.90 or later with CDH 4.4.0 or later.
• Apache Accumulo - 1.4.3 with CDH 4.3.0, 1.4.4 with CDH 4.5.0, and 1.6.0 with CDH 4.6.0.

For more information, see the Product Compatibility Matrix.

Cloudera Manager requires the following resources:

• Disk Space
  • Cloudera Manager Server
    • 5 GB on the partition hosting /var.
    • 500 MB on the partition hosting /usr.
    • For parcels, the space required depends on the number of parcels you download to the Cloudera Manager Server and distribute to Agent hosts. You can download multiple parcels of the same product, of different versions and builds. If you are managing multiple clusters, only one parcel of a product/version/build/distribution is downloaded on the Cloudera Manager Server—not one per cluster. In the local parcel repository on the Cloudera Manager Server, the approximate sizes of the various parcels are as follows:
      • CDH 4.6 - 700 MB per parcel; CDH 5 (which includes Impala and Search) - 1.5 GB per parcel (packed), 2 GB per parcel (unpacked)
      • Cloudera Impala - 200 MB per parcel
      • Cloudera Search - 400 MB per parcel
  • Cloudera Management Service -The Host Monitor and Service Monitor databases are stored on the partition hosting /var. Ensure that you have at least 20 GB available on this partition. For more information, see Data Storage for Monitoring Data.
  • Agents - On Agent hosts each unpacked parcel requires about three times the space of the downloaded parcel on the Cloudera Manager Server. By default unpacked parcels are located in /opt/cloudera/parcels.
• RAM - 4 GB is recommended for most cases and is required when using Oracle databases. 2 GB may be sufficient for non-Oracle deployments with fewer than 100 hosts. However, to run the Cloudera Manager Server on a machine with 2 GB of RAM, you must tune down its maximum heap size (by modifying -Xmx in /etc/default/cloudera-scm-server). Otherwise the kernel may kill the Server for consuming too much RAM.
• Python - Cloudera Manager and CDH 4 require Python 2.4 or later, but Hue in CDH 5 and package installs of CDH 5 require Python 2.6 or 2.7. All supported operating systems include Python version 2.4 or later.
• Perl - Cloudera Manager requires perl.

The hosts in a Cloudera Manager deployment must satisfy the following networking and security requirements:

• Cluster hosts must have a working network name resolution system and correctly formatted /etc/hosts file. All cluster hosts must have properly configured forward and reverse host resolution through DNS. The /etc/hosts files must
  • Contain consistent information about hostnames and IP addresses across all hosts
  • Not contain uppercase hostnames
  • Not contain duplicate IP addresses

  Also, do not use aliases, either in /etc/hosts or in configuring DNS. A properly formatted /etc/hosts file should be similar to the following example:

  127.0.0.1 localhost.localdomain localhost
  192.168.1.1 cluster-01.example.com cluster-01
  192.168.1.2 cluster-02.example.com cluster-02
  192.168.1.3 cluster-03.example.com cluster-03

• In most cases, the Cloudera Manager Server must have SSH access to the cluster hosts when you run the installation or upgrade wizard. You must log in using a root account or an account that has password-less sudo permission. For authentication during the installation and upgrade procedures, you must either enter the password or upload a public and private key pair for the root or sudo user account. If you want to use a public and private key pair, the public key must be installed on the cluster hosts before you use Cloudera Manager.

  Cloudera Manager uses SSH only during the initial install or upgrade. Once the cluster is set up, you can disable root SSH access or change the root password. Cloudera Manager does not save SSH credentials, and all credential information is discarded when the installation is complete. For more information, see Permission Requirements for Package-based Installations and Upgrades of CDH.

• If single user mode is not enabled, the Cloudera Manager Agent runs as root so that it can make sure the required directories are created and that processes and files are owned by the appropriate user (for example, the hdfs and mapred users).
• No blocking is done by Security-Enhanced Linux (SELinux).

  Important: Cloudera Enterprise is supported on platforms with Security-Enhanced Linux (SELinux) enabled. However, policies need to be provided by other parties or created by the administrator of the cluster deployment. Cloudera is not responsible for policy support nor policy enforcement, nor for any issues with such. If you experience issues with SELinux, contact your OS support provider.

• IPv6 must be disabled.
• No blocking by iptables or firewalls; port 7180 must be open because it is used to access Cloudera Manager after installation. Cloudera Manager communicates using specific ports, which must be open.
• For RHEL and CentOS, the /etc/sysconfig/network file on each host must contain the hostname you have just set (or verified) for that host.
• Cloudera Manager and CDH use several user accounts and groups to complete their tasks. The set of user accounts and groups varies according to the components you choose to install. Do not delete these accounts or groups and do not modify their permissions and rights. Ensure that no existing systems prevent these accounts and groups from functioning. For example, if you have scripts that delete user accounts not in a whitelist, add these accounts to the list of permitted accounts. Cloudera Manager, CDH, and managed services create and use the following accounts and groups:

Table 2. Users and Groups