Fix pid=host example in documentation

The existing example didn't illustrate how to
install strace in the container. In addition,
the rhel7 image used is no longer public (and maintained)
so not a good image to use in the example.

This updates the example to use htop (strace is
not working without disabling apparmor for the container)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2015-12-08 14:52:58 +01:00 committed by Tibor Vass
parent 18eb9f2e64
commit 31ad32c879
1 changed files with 20 additions and 3 deletions

View File

@ -206,10 +206,27 @@ on the system. For example, you could build a container with debugging tools
like `strace` or `gdb`, but want to use these tools when debugging processes like `strace` or `gdb`, but want to use these tools when debugging processes
within the container. within the container.
$ docker run --pid=host rhel7 strace -p 1234 ### Example: run htop inside a container
This command would allow you to use `strace` inside the container on pid 1234 on Create this Dockerfile:
the host.
```
FROM alpine:latest
RUN apk add --update htop && rm -rf /var/cache/apk/*
CMD ["htop"]
```
Build the Dockerfile and tag the image as `myhtop`:
```bash
$ docker build -t myhtop .
```
Use the following command to run `htop` inside a container:
```
$ docker run -it --rm --pid=host myhtop
```
## UTS settings (--uts) ## UTS settings (--uts)