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:
- Compute (nova)
Check individual options to discover if they are mutable.
In practice¶
A common use case is to enable debug logging after a failure. Use the mutable
config option called ‘debug’ to do this (providing log_config_append
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’ toTrue. - 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.
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