Train Series Release Notes

Known Issues

  • MemcacheD sets PrivateDevices=true in its systemd unit file to add extra security around mount namespaces. While this is useful when running MemcacheD on a bare metal host with other services, it is less useful when MemcacheD is already in a container with its own namespaces. In addition, LXC 2.0.8 presents /dev/ptmx as a bind mount within the container and systemd 219 (on CentOS 7) cannot make an additional bind mount of /dev/ptmx when PrivateDevices is enabled.

    Deployers can memcached_disable_privatedevices to yes to set PrivateDevices=false in the systemd unit file for MariaDB on CentOS 7. The default is no, which keeps the default systemd unit file settings from the MemcacheD package.

    For additional information, refer to the following bugs:

New Features

  • The memcached_server role now supports the ability to configure whether apt/yum tasks install the latest available package, or just ensure that the package is present. The default action is to ensure that the latest package is present. The action taken may be changed to only ensure that the package is present by setting memcached_package_state to present.

Upgrade Notes

  • The variable memcached_apt_packages has been renamed to memcached_distro_packages.

  • The memcached_server role always checks whether the latest package is installed when executed. If a deployer wishes to change the check to only validate the presence of the package, the option memcached_package_state should be set to present.

New Features

  • The openstack-ansible-memcached_server role includes a new override, memcached_connections which is automatically calculated from the number of memcached connection limit plus additional 1k to configure the OS nofile limit. Without proper nofile limit configuration, memcached will crash in order to support higher parallel connection TCP/Memcache counts.

Upgrade Notes

  • The variable verbose has been removed. Deployers should rely on the debug var to enable higher levels of memcached logging.