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17 lines
910 B
Markdown
17 lines
910 B
Markdown
# Fault Tolerance
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To minimize the single point of failure, NATS Streaming server can be run in Fault Tolerance mode. It works by having a group of servers with one acting as the active server \(accessing the store\) and handling all communication with clients, and all others acting as standby servers.
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It is important to note that is not possible to run Nats Streaming as Fault Tolerance mode and Clustering mode at the same time.
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To start a server in Fault Tolerance \(FT\) mode, you specify an FT group name.
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Here is an example on how starting 2 servers in FT mode running on the same host and embedding the NATS servers:
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```text
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nats-streaming-server -store file -dir datastore -ft_group "ft" -cluster nats://localhost:6222 -routes nats://localhost:6223 -p 4222
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nats-streaming-server -store file -dir datastore -ft_group "ft" -cluster nats://localhost:6223 -routes nats://localhost:6222 -p 4223
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```
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