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Fix CMD --ignored-param1 example 

Co-authored-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: Stefan Scherer <stefan.scherer@docker.com>
This commit is contained in:
Stefan Scherer 2020-09-03 16:21:22 +02:00 committed by Sebastiaan van Stijn
parent 1f4111d2bf
commit 119c7fb84d
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1 changed files with 15 additions and 12 deletions
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27
docs/reference/builder.md
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@ -1632,7 +1632,7 @@ If you forget to add `exec` to the beginning of your `ENTRYPOINT`:
```dockerfile
FROM ubuntu
ENTRYPOINT top -b
CMD --ignored-param1
CMD -- --ignored-param1
```
You can then run it (giving it a name for the next step):
@ -1640,12 +1640,15 @@ You can then run it (giving it a name for the next step):
```console
$ docker run -it --name test top --ignored-param2
Mem: 1704184K used, 352484K free, 0K shrd, 0K buff, 140621524238337K cached
CPU: 9% usr 2% sys 0% nic 88% idle 0% io 0% irq 0% sirq
Load average: 0.01 0.02 0.05 2/101 7
PID PPID USER STAT VSZ %VSZ %CPU COMMAND
1 0 root S 3168 0% 0% /bin/sh -c top -b cmd cmd2
7 1 root R 3164 0% 0% top -b
top - 13:58:24 up 17 min, 0 users, load average: 0.00, 0.00, 0.00
Tasks: 2 total, 1 running, 1 sleeping, 0 stopped, 0 zombie
%Cpu(s): 16.7 us, 33.3 sy, 0.0 ni, 50.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 1990.8 total, 1354.6 free, 231.4 used, 404.7 buff/cache
MiB Swap: 1024.0 total, 1024.0 free, 0.0 used. 1639.8 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 2612 604 536 S 0.0 0.0 0:00.02 sh
6 root 20 0 5956 3188 2768 R 0.0 0.2 0:00.00 top
```
You can see from the output of `top` that the specified `ENTRYPOINT` is not `PID 1`.
@ -1654,12 +1657,12 @@ If you then run `docker stop test`, the container will not exit cleanly - the
`stop` command will be forced to send a `SIGKILL` after the timeout:
```console
$ docker exec -it test ps aux
$ docker exec -it test ps waux
PID USER COMMAND
1 root /bin/sh -c top -b cmd cmd2
7 root top -b
8 root ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.4 0.0 2612 604 pts/0 Ss+ 13:58 0:00 /bin/sh -c top -b --ignored-param2
root 6 0.0 0.1 5956 3188 pts/0 S+ 13:58 0:00 top -b
root 7 0.0 0.1 5884 2816 pts/1 Rs+ 13:58 0:00 ps waux
$ /usr/bin/time docker stop test