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As per https://github.com/coreos/etcd/blob/master/Documentation/configuration.md > The official etcd ports are 2379 for client requests, and 2380 for peer > communication. Some legacy code and documentation still references > ports 4001 and 7001, but all new etcd use and discussion should > adopt the assigned ports. Indeed, etcd-2.1.1-2.el7.x86_64 as comes in centos 7 "extras" repo is configured to listen to clients at port 2379, not 4001.