I have been trying to debug and step into docker daemon code using gdb or cgdb on a Ubuntu 14.04 container running on host OS (ubuntu 14.04 OS). I have used -O0 -g flags while building the debug binaries within a container.
Version of go used in the container:
# go version
go version go1.4.3 linux/amd64
I am unable to step through the code using cgdb:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"... Reading symbols from bundles/1.9.0-dev/dynbinary/docker...done. (
gdb) b main.handleGlobalDaemonFlag
Breakpoint 1 at 0x497b30
(gdb) r daemon -D
Starting program: /go/src/github.com/docker/docker/bundles/1.9.0-dev/dynbinary/docker daemon -D
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff5a00700 (LWP 2775)]
[New Thread 0x7ffff51ff700 (LWP 2776)]
[New Thread 0x7ffff49fe700 (LWP 2777)]
Breakpoint 1, 0x0000000000497b30 in main.handleGlobalDaemonFlag ()
(gdb) n Single stepping until exit from function main.handleGlobalDaemonFlag, which has no line number information.
Breakpoint 1, 0x0000000000497b30 in main.handleGlobalDaemonFlag ()
(gdb) l 1 in /tmp/go-build212795923/github.com/docker/docker/pkg/term/_obj/_cgo_export.c
(gdb)
How to confirm that the built binaries are debug ? Can I use a tool readelf to read through the headers to confirm this ?
Should I be setting a GOPATH or GOROOT to a specific directory ?
root@6511af5b06c1:/go/src/github.com/docker/docker# echo $GOROOT
root@6511af5b06c1:/go/src/github.com/docker/docker# echo $GOPATH
/go:/go/src/github.com/docker/docker/vendor
Are there any other dependencies which could be missing on my environment ?
