This is a small utility designed to capture the statistics for the run of a Docker container before its destruction.
It is designed to be used as the main process of a Docker container that wraps the real command by waiting for it to exit and then querying the active Cgroup subsystems to gather their statistics. It dumps these statistics to a file as JSON and then exits with the exit code of the real command.
$ docker run --rm -ti -v`pwd`:/tmp/:rw ubuntu /tmp/docker-stats-on-exit-shim /tmp/output.json /bin/sleep 1
$ cat output.json{
"wall_time": 1000765975,
"user_cpu_time": 0,
"sys_cpu_time": 0,
"cgroups": {
"cpu_stats": {
"cpu_usage": {
"total_usage": 21326399,
"percpu_usage": [
14721062,
1512284,
1730836,
3362217,
0,
0,
0,
0
],
"usage_in_kernelmode": 0,
"usage_in_usermode": 10000000
},
"throttling_data": {}
},
"memory_stats": {
...
}
}
}mkdir -p src/github.com/delcypher
export GOPATH=`pwd`
cd src/github.com/delcypher
git clone [email protected]:delcypher/docker-stats-on-exit-shim.git
cd docker-stats-on-exit-shim
git submodule init && git submodule update
go get .
go build- The recorded statistics won't quite be before container destruction but it's probably close enough.
- The recorded statistics will contain the run of the tool (i.e. it will contribute to CPU usage). It should be a very small contribution though.
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