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Add support for --pid=container:<id>

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Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
Upstream-commit: fb43ef649bc6aa11ca19c0e046518e85e1c7e2fa
Component: engine
This commit is contained in:
Mrunal Patel
2016-05-06 14:56:03 -04:00
parent f38f115e61
commit 612ad97231
9 changed files with 154 additions and 13 deletions
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20
components/engine/docs/reference/run.md
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@ -193,7 +193,8 @@ the digest value is predictable and referenceable.
## PID settings (--pid)
--pid="" : Set the PID (Process) Namespace mode for the container,
'host': use the host's PID namespace inside the container
'container:<name|id>': joins another container's PID namespace
'host': use the host's PID namespace inside the container
By default, all containers have the PID namespace enabled.
@ -229,6 +230,23 @@ Use the following command to run `htop` inside a container:
$ docker run -it --rm --pid=host myhtop
```
Joining another container's pid namespace can be used for debugging that container.
### Example
Start a container running a redis server:
```bash
$ docker run --name my-redis -d redis
```
Debug the redis container by running another container that has strace in it:
```bash
$ docker run --it --pid=container:my-redis bash
$ strace -p 1
```
## UTS settings (--uts)
--uts="" : Set the UTS namespace mode for the container,