假設當前服務器的ip是：192.168.56.130
允許 所有ip 注冊
consul agent -server -ui -bootstrap-expect=1 -data-dir=/usr/local/consul -node=devmaster -advertise=192.168.56.130 -bind=0.0.0.0 -client=0.0.0.0
只允許 當前ip 注冊
consul agent -server -ui -bootstrap-expect=1 -data-dir=/usr/local/consul -node=devmaster -advertise=192.168.56.130 -bind=192.168.56.130 -client=127.0.0.1
此時，若別的ip的項目想要連接這個Consul，那么啟動就會報錯：
com.ecwid.consul.transport.TransportException: org.apache.http.conn.HttpHostConnectException: Connect to 192.168.56.130:8500 [/192.168.56.130] failed: Connection refused: connect
需要注意：
1、-bind要用完整ip地址，如果使用127.0.0.1，否則雖然consul能啟動，但是consul日志會不停地打印如下信息
2018/12/17 15:56:14 [WARN] consul: error getting server health from "devmaster": context deadline exceeded
2018/12/17 15:56:15 [WARN] consul: error getting server health from "devmaster": rpc error getting client: failed to get conn: dial tcp 127.0.0.1:0->192.168.56.130:8300: connect: connection refused
2018/12/17 15:56:16 [WARN] consul: error getting server health from "devmaster": context deadline exceeded
2018/12/17 15:56:17 [WARN] consul: error getting server health from "devmaster": rpc error getting client: failed to get conn: dial tcp 127.0.0.1:0->192.168.56.130:8300: connect: connection refused
2、-client 需要用127.0.0.1，如果用完整的ip地址，consul都啟動不起來
3、consul agent -dev 也是只允許當前ip注冊，但這個是本地開發時用的，正式服務器往往不用
4、這時項目中的配置文件也要相應的更改，使用127.0.0.1 ，而不是完整ip地址。否則，項目在服務器端也啟動不起來了，囧
spring:
cloud:
consul:
host: 127.0.0.1
port: 8500
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