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Chapter 3. Major Updates
This section lists all major updates, enhancements, and new features.
Support for SELinux has been added
With this release, the SELinux policy for Red Hat Ceph Storage has been added. SELinux provides another security layer by enforcing Mandatory Access Control (MAC) mechanism over all processes. To learn more about SELinux, see the SELinux User’s and Administrator’s Guide for Red Hat Enterprise Linux 7.
SELinux support for Ceph is not enabled by default. To use it, install the ceph-selinux package. For detailed information about this process, see the SELinux section in the Red Hat Ceph Storage Installation Guide for Red Hat Enterprise Linux.
All Ceph daemons will be down for the time the ceph-selinux package is being installed. Therefore, your cluster node will not be able to serve any data at this point. This operation is necessary in order to update the metadata of the files located on the underlying file system and to make Ceph daemons run with the correct context. This operation may take several minutes depending on the size and speed of the underlying storage.
Package caching for Ubuntu is now supported
With this release, a caching server can be set up to provide Red Hat Ceph Storage repositories for offline Ceph clusters. See the Package Caching for Red Hat Ceph Storage on Ubuntu article on the Red Hat Customer Portal to learn more.
A new "ceph osd crush tree" command has been added
The CRUSH map contains a list of buckets for aggregating the devices into physical locations. With this update, a new ceph osd crush tree command has been added to Red Hat Ceph Storage. The command prints CRUSH buckets and items in a tree view. As a result, it is now easier to analyze the CRUSH map to determine a list of OSD daemons in a particular bucket.
TCMalloc thread cache is now configurable
With Red Hat Ceph Storage 1.3.2, support for modifying the size of the TCMalloc thread cache has been added. Increasing the thread cache size significantly improves Ceph cluster performance.
To set the thread cache size, edit the value of the TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES parameter in the Ceph system configuration file, that is /etc/sysconfig/ceph for Red Hat Enterprise Linux and /etc/default/ceph for Ubuntu.
In addition, the default value of TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES has been changed from 32 MB to 128 MB.
Red Hat Satellite 5 and Red Hat Ceph Storage integration
Red Hat Ceph Storage nodes can be connected to the Red Hat Satellite 5 Server. The server then hosts package repositories and provides system updates.
Once you register your Ceph nodes with the Satellite 5 server, you can deliver upgrades to the Ceph cluster without allowing a direct connection to the Internet, as well as search and view errata applicable to the cluster nodes.
To learn more, see the How to Register Ceph with Satellite 5 article on the Red Hat Customer Portal.
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