May 2018
Intermediate to advanced
554 pages
13h 51m
English
Content preview from Kubernetes Cookbook - Second Edition
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Getting ready
Before we learn a more flexible way to set up an etcd cluster, we should know etcd comes with two major versions so far, which are v2 and v3. etcd3 is a newer version that aims to be more stable, efficient, and reliable. Here is a simple comparison to introduce the major differences in their implementation:
|
|
etcd2 |
etcd3 |
|
Protocol |
http |
gRPC |
|
Key expiration |
TTL mechanism |
Leases |
|
Watchers |
Long polling over HTTP |
Via a bidirectional gRPC stream |
etcd3 aims to be the next generation of etcd2 . etcd3 supports the gRPC protocol by default. gRPC uses HTTP2, which allows multiple RPC streams over a TCP connection. In etcd2, however, a HTTP request must establish a connection in every request it makes. ...
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