原始文档：https://golang.org/doc/gdb，本文以docker的libnetwork库为例，说明如何用gdb调试。

首先安装golang和gdb(版本7.0以上)，在FreeBSD上，请用gdb7121。设置GOPATH=$HOME/go。

下载libnetwork：go get github.com/docker/libnetwork

在$GOPATH/github.com/clovertrail/testlibnetwork目录，创建测试程序，此处直接使用libnetwork的示例，稍作修改：

@H_502_11@package main import ( "fmt" "github.com/docker/libnetwork" "github.com/docker/libnetwork/options" "github.com/docker/libnetwork/netlabel" "github.com/docker/libnetwork/config" ) func main() { networkType := "bridge" // Create a new controller instance driverOptions := options.Generic{} genericOption := make(map[string]interface{}) genericOption[netlabel.GenericData] = driverOptions controller,err := libnetwork.New(config.OptionDriverConfig(networkType,genericOption)) if err != nil { fmt.Println(err) return } fmt.Println(controller) // Create a network for containers to join. // NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can make use of network,err := controller.NewNetwork(networkType,"network1","") if err != nil { fmt.Println(err) return } fmt.Println(network) // For each new container: allocate IP and interfaces. The returned network // settings will be used for container infos (inspect and such),as well as // iptables rules for port publishing. This info is contained or accessible // from the returned endpoint. ep,err := network.CreateEndpoint("Endpoint1") if err != nil { fmt.Println(err) return } fmt.Println(ep) // Create the sandBox for the container. // NewSandBox accepts Variadic optional arguments which libnetwork can use. sbx,err := controller.NewSandBox("container1",libnetwork.OptionHostname("test"),libnetwork.OptionDomainname("docker.io")) fmt.Println(sbx) // A sandBox can join the endpoint via the join api. err = ep.Join(sbx) if err != nil { fmt.Println(err) return } }
项目的目录结构如下：

.
`-- testlibnetwork
|-- bingo.go
`-- vendor
`-- github.com
`-- docker
`-- libnetwork -> $GOPATH/src/github.com/docker/libnetwork

重新编译libnetwork，打印编译的命令细节，并关闭内联优化：

go build -a -x -gcflags "-N -l" github.com/docker/libnetwork

编译测试用例，同时关闭内联优化：

go build -gcflags "-N -l" -o ~/go/bin/bingo bingo.go

好了，启动gdb，开始调试：

gdb ~/go/bin/bingo -d $GOROOT

正常情况，gdb会自动load $GOROOT/src/runtime/runtime-gdb.py，如果没有load，请手动load：

(gdb) source $GOROOT/src/runtime/runtime-gdb.py

开始调试，设置断点。go里面的第三方源代码的路径和import里面是一致的，比如我们想在controller.go:180行设断点：

(gdb) b github.com/docker/libnetwork/controller.go:180
Breakpoint 1 at 0x481397: file /home/honzhan/go/src/github.com/clovertrail/testlibnetwork/vendor/github.com/docker/libnetwork/controller.go,line 180.

(gdb) r
Starting program: /usr/home/honzhan/go/bin/bingo
[New LWP 100134 of process 16801]
[New LWP 100260 of process 16801]
[New LWP 100283 of process 16801]
[New LWP 100294 of process 16801]
[New LWP 100470 of process 16801]


Thread 1 hit Breakpoint 1,github.com/clovertrail/testlibnetwork/vendor/github.com/docker/libnetwork.New (
cfgOptions= []github.com/clovertrail/testlibnetwork/vendor/github.com/docker/libnetwork/config.Option = {...},~r1=...,~r2=...)
at /home/honzhan/go/src/github.com/clovertrail/testlibnetwork/vendor/github.com/docker/libnetwork/controller.go:180
180 c := &controller{

更多调试命令请参考https://golang.org/doc/gdb