New in 16.04, the kernel crash dump mechanism now supports remote kernel crash dumps. It is now possible to send kernel crash dumps to a remote server using the SSH or NFS protocols. Details of the new functionality are available in the Ubuntu Server Guide.
With the release of 16.04.2, the server ISOs are now larger than a standard 700MB CD. The increase in size is due to the ability to run the installer with the use of the Hardware Enablement (HWE) kernel. The HWE kernels enables newer platforms and components, which require functionality delivered in newer kernels, while allowing the continued use of an LTS release.
Ubuntu 16.04 includes the latest OpenStack release, Mitaka, including the following components:
OpenStack Identity – Keystone
OpenStack Imaging – Glance
OpenStack Block Storage – Cinder
OpenStack Compute – Nova
OpenStack Networking – Neutron
OpenStack Telemetry – Ceilometer and Aodh
OpenStack Orchestration – Heat
OpenStack Dashboard – Horizon
OpenStack Object Storage – Swift
OpenStack Database as a Service – Trove
OpenStack DNS – Designate
OpenStack Bare-metal – Ironic
OpenStack Filesystem – Manila
OpenStack Key Manager – Barbican
Please refer to the OpenStack Mitaka release notes for full details of this release of OpenStack.
OpenStack Mitaka is also provided via the Ubuntu Cloud Archive for OpenStack Mitaka for Ubuntu 14.04 LTS users.
Ubuntu 16.04 also includes the first GA release of of the Nova driver for LXD (‘nova-lxd’).
WARNING: Upgrading an OpenStack deployment is a non-trivial process and care should be taken to plan and test upgrade procedures which will be specific to each OpenStack deployment.
Make sure you read the OpenStack Charm Release Notes for more information about how to deploy Ubuntu OpenStack using Juju.
Libvirt has been updated to the 1.3.1 release.
Qemu has been updated to the 2.5 release.
See http://wiki.qemu.org/ChangeLog/2.5 for details.
Open vSwitch 2.5.0
Ubuntu 16.04 includes the latest release of Open vSwitch, 2.5.0. This is also an LTS release of Open vSwitch.
Ubuntu 16.04 also includes support for Open vSwitch integrated with DPDK (Data Plane Development Kit) enabling fast packet processing through userspace usage of compatible networking cards – see the openvswitch-switch-dpdk package for more details.
Ubuntu 16.04 includes the latest release candidate (10.1.2) of the Ceph Jewel stable release; An update to the final release version will be delivered as an SRU to Ubuntu 16.04.
For full details on the Ceph Jewel release, please refer to the upstream release notes.
Ubuntu 16.04 includes version 1.9.15 of the Nginx web server, with an expectation to provide the next stable release of Nginx, 1.10.0, as an SRU after release (which will be virtually identical to 1.9.15). This version of Nginx also includes HTTP/2 support, which supersedes SPDY support previously provided in the Nginx packages.
Ubuntu 16.04 LTS includes LXD, a new, lightweight, network-aware, container manager offering a VM-like experience built on top of Linux containers.
LXD comes pre-installed with all Ubuntu 16.04 server installations, including cloud images and can easily be installed on the Desktop version too. It can be used standalone through its simple command line client, through Juju to deploy your charms inside containers or with OpenStack for large scale deployments.
All the LXC components – LXC, LXCFS and LXD – are at version 2.0 in Ubuntu 16.04 LTS.
Learn more about LXD here: http://www.ubuntu.com/cloud/lxd/
And discover all the LXD 2.0 features with: https://www.stgraber.org/2016/03/11/lxd-2-0-blog-post-series-012/
docker was upgraded to version 1.10. Note that this requires migration of existing images to a new format which will be performed on the first start of the service. This migration can take a long time and put a high load on the system; see https://docs.docker.com/engine/migration/ for more information.
PHP was upgraded to 7.0. Note that this will require modifications to custom PHP extensions (https://wiki.php.net/phpng-upgrading) and may require modifications to PHP source code (http://php.net/manual/en/migration70.php).
- NGINX and PHP 7.0
Upgrading from a prior version of Ubuntu with PHP5 FPM configurations and NGINX will require a manual configuration change (details at: http://dark-net.net/nginx-http2-php7.0).
Most PHP-dependent packages were either rebuilt or upgraded for PHP7.0 support. Where that was not possible, packages may have been removed from the archive. There was one exception, Drupal7.
Drupal7 did not pass upstream testing with PHP7.0 as of the 16.04 release (https://www.drupal.org/node/2656548) and therefore the Ubuntu package was uninstallable. Before Ubuntu 16.04.2, Drupal7 was updated and is now installable (1582340).
MySQL has been updated to 5.7. Some configuration directives have been changed or deprecated, so if you are upgrading from a previously customized configuration then you will need to update your customization appropriately. See bug 1571865 for details.
Password behavior when the MySQL root password is empty has changed. Packaging now enables socket authentication when the MySQL root password is empty. This means that a non-root user can’t log in as the MySQL root user with an empty password. For details, see the NEWS file.
Juju and Juju UI have been updated to 2.0beta4. The final Juju 2.0 release will come via an update post-release. The package name is juju-2.0. Juju 1.25.5 is available in the juju package for existing production environments. Please read the upgrade documentation before moving to 2.0.
Juju now supports modeling workloads on AWS, Microsoft Azure, Google Cloud Engine, Rackspace, Joyent, LXD, MAAS, and manual deployments.