该docker exec
命令将等待,直到默认情况下完成为止。docker exec
我可以想到的是,在命令运行完成之前返回的可能原因是:
docker exec
使用分离标志aka在后台运行-d
。这里有些例子:
$ # launch a container to test:
$ docker run -d --rm --name test-exec busybox tail -f /dev/null
a218f90f941698960ee5a9750b552dad10359d91ea137868b50b4f762c293bc3
$ # test a sleep command, works as expected
$ time docker exec -it test-exec sleep 10
real 0m10.356s
user 0m0.044s
sys 0m0.040s
$ # test running without -it, still works
$ time docker exec test-exec sleep 10
real 0m10.292s
user 0m0.040s
sys 0m0.040s
$ # test running that command with -d, runs in the background as requested
$ time docker exec -itd test-exec sleep 10
real 0m0.196s
user 0m0.056s
sys 0m0.024s
$ # run a command inside the container in the background using a shell and &
$ time docker exec -it test-exec /bin/sh -c 'sleep 10 &'
real 0m0.289s
user 0m0.048s
sys 0m0.044s