Changing config at runtime¶
OpenStack Newton introduces the ability to reload (or ‘mutate’) certain configuration options at runtime without a service restart. The following projects support this:
Check individual options to discover if they are mutable.
A common use case is to enable debug logging after a failure. Use the mutable
config option called ‘debug’ to do this (providing
has not been set). An admin user may perform the following steps:
Log onto the compute node.
Edit the config file (EG
nova.conf) and change ‘debug’ to
Send a SIGHUP signal to the nova process (For example,
pkill -HUP nova).
A log message will be written out confirming that the option has been changed. If you use a CMS like Ansible, Chef, or Puppet, we recommend scripting these steps through your CMS.