go-micro之etcd集群

一:下载etcd安装包

　　etcd-v3.4.7-windows-amd64

二:在etcd的压缩文件内创建3个启动配置文件

配置内容如下

.etcd.exe --name etcd01 ^
--data-dir .dataetcd01 ^
--advertise-client-urls http://127.0.0.1:2379 ^
--listen-client-urls http://127.0.0.1:2379 ^
--listen-peer-urls http://127.0.0.1:2380 ^
--initial-advertise-peer-urls http://127.0.0.1:2380 ^
--initial-cluster-token etcd-cluster-1 ^
--initial-cluster etcd01=http://127.0.0.1:2380,etcd02=http://127.0.0.1:2381,etcd03=http://127.0.0.1:2382 ^
--initial-cluster-state new

pause

.etcd.exe --name etcd02 ^
--data-dir .dataetcd02 ^
--advertise-client-urls http://127.0.0.1:3379 ^
--listen-client-urls http://127.0.0.1:3379 ^
--listen-peer-urls http://127.0.0.1:2381 ^
--initial-advertise-peer-urls http://127.0.0.1:2381 ^
--initial-cluster-token etcd-cluster-1 ^
--initial-cluster etcd01=http://127.0.0.1:2380,etcd02=http://127.0.0.1:2381,etcd03=http://127.0.0.1:2382 ^
--initial-cluster-state new

pause

三:查看节点状态

etcdctl.exe --write-out=table --endpoints=http://127.0.0.1:2379,http://127.0.0.1:3379,http://127.0.0.1:4379 endpoint status

+-----------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|       ENDPOINT        |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-----------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| http://127.0.0.1:2379 | bf9071f4639c75cc |   3.4.4 |  115 kB |      true |      false |        13 |         99 |                 99 |        |
| http://127.0.0.1:3379 | e7b968b9fb1bc003 |   3.4.4 |  115 kB |     false |      false |        13 |         99 |                 99 |        |
| http://127.0.0.1:4379 | 19ac17627e3e396f |   3.4.4 |  106 kB |     false |      false |        13 |         99 |                 99 |        |
+-----------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

etcd启动

线上etcd和本地启动有讲究了，如果etcd是单独的服务器，那么在不加任何参数的情况下直接启动，那基本是调不通的。

$ ./service --registry=etcd --registry_address=xx.xx.xx.xx:2379
2020-03-17 17:04:42 Starting [service] go.micro.srv.user
2020-03-17 17:04:42 Server [grpc] Listening on [::]:48493
2020-03-17 17:04:42 Registry [etcd] Registering node: go.micro.srv.user-f32a2950-8e59-44d4-ac86-f4e1ec103395
{"level":"warn","ts":"2020-03-17T17:04:47.849+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-e45decee-12bf-4a9b-a7ab-f92eece39420/xx.xx.xx.xx:2379","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest connection error: connection error: desc = "transport: Error while dialing dial tcp xx.xx.xx.xx:2379: connect: connection refused""}
2020-03-17 17:04:47 Server register error: %!(EXTRA context.deadlineExceededError=context deadline exceeded)

这就是错误示例，etcd拒绝连接。 为了能顺利看到胜利的结果，需要这样启动etcd:

$ ./etcd --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-advertise-peer-urls http://0.0.0.0:2380  --initial-cluster my-etcd-1=http://0.0.0.0:2380

将ip为0.0.0.0可以理解为不限制连接机器（真正的生产不推荐这样设置）。 服务启动参数--registry_address=xx.xx.xx.xx:2379不能带http://。

详细go-micro使用etcd服务注册发现链接:https://github.com/yuedun/micro-service/blob/master/README.md