Template:CephNTPConfiguration
NTP Configuration
NTP stands for Network Time Protocol, it's a system to make sure that the clock on computers is accurate. With Ceph cluster deployments it's important that the clock is very accurate. When the clocks on two or more appliances are not synchronized it is called clock skew. Clock skew can happen for a few different reasons, most commonly:
- NTP server setting is not configured on one or more appliances (use the Modify Storage System dialog to configure)
- NTP server is not accessible due to firewall configure issues
- No secondary NTP server is specified so the outage of the primary is leading to skew issues
- NTP servers are offline
- Network configuration problem is blocking access to the NTP servers
In the event that there are clock skew problems the system will generate alerts. There is a Fix Clock Skew dialog one can use to force all appliances/nodes in the cluster to update their clocks to try to fix it. This dialog is accessible by right-clicking on the Ceph Cluster icon in in the tree-view and choosing Fix Clock Skew from the menu. One should review the NTP server configuration settings and verify the health of NTP servers if clock skew issues are recurring.