53.go1.13 安装 etcd3.3的问题

https://github.com/coreos/go-systemd

安装 etcd 的时候提示错误：

[root@JhouShuai etcdDemo]# go build main.go 
go: finding github.com/coreos/go-systemd/journal latest
go: finding github.com/coreos/go-systemd latest
go: finding github.com/gogo/protobuf v1.2.1
build command-line-arguments: cannot load github.com/coreos/go-systemd/journal: no matching versions for query "latest"

cannot find module providing package github.com/coreos/go-systemd/journal 

第一种方案：

go1.13错误。解决方式如下：

1.自己从github拉取go-systemd 并保存到 $GOPATH src 下

$ mkdir github.com
$ cd github.com
$ git clone https://github.com/coreos/go-systemd.git
$ cd go-systemd
$ pwd
/Users/zhoushuai/go/src/github.com/go-systemd

2.使用replace在go.mod中替换go-systemd

$ vim go.mod
replace github.com/coreos/go-systemd => /Users/zhoushuai/go/src/github.com/go-systemd

这里要注意的是：不要直接使用路径 github.com/coreos/go-systemd/journal，因为该路径下没有 go.mod 文件。需要之前上一层目录

第二种方案：

replace github.com/coreos/go-systemd => github.com/coreos/go-systemd/v22 v22.0.0
[root@JhouShuai www]# go mod tidy 
go: downloading github.com/coreos/go-systemd/v22 v22.0.0
go: extracting github.com/coreos/go-systemd/v22 v22.0.0
[root@JhouShuai etcdDemo]# go build main.go 
go: finding github.com/coreos/go-systemd/v22 v22.0.0
[root@JhouShuai etcdDemo]# ls
main  main.go
[root@JhouShuai etcdDemo]# ./main 
[key:"name1" create_revision:4 mod_revision:7 version:2 value:"lesroad"  key:"name2" create_revision:5 mod_revision:8 version:2 value:"haha" ]