Red Hat Summit第6章 Managing data loss
The proper response to a data loss event will depend on the number of replicas that have been affected and the type of lost data.
6.1. Responding to isolated data loss
When a data loss event occurs, minimize replicating the data loss by immediately isolating the affected servers. Then create replacement replicas from the unaffected remainder of the environment.
Prerequisites
- A robust IdM replication topology with multiple replicas. See Preparing for server loss with replication.
Procedure
To limit replicating the data loss, disconnect all affected replicas from the rest of the topology by removing their replication topology segments.
Display all
domainreplication topology segments in the deployment.[root@server ~]# ipa topologysegment-find Suffix name: domain ------------------ 8 segments matched ------------------ Segment name: segment1 Left node: server.example.com Right node: server2.example.com Connectivity: both ... ---------------------------- Number of entries returned 8 ----------------------------Delete all
domaintopology segments involving the affected servers.[root@server ~]# ipa topologysegment-del Suffix name: domain Segment name: segment1 ----------------------------- Deleted segment "segment1" -----------------------------Perform the same actions with any
catopology segments involving any affected servers.[root@server ~]# ipa topologysegment-find Suffix name: ca ------------------ 1 segments matched ------------------ Segment name: ca_segment Left node: server.example.com Right node: server2.example.com Connectivity: both ---------------------------- Number of entries returned 1 ---------------------------- [root@server ~]# ipa topologysegment-del Suffix name: ca Segment name: ca_segment ----------------------------- Deleted segment "ca_segment" -----------------------------
- The servers affected by the data loss must be abandoned. To create replacement replicas, see Recovering multiple servers with replication.
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