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Author SHA1 Message Date
Akihiro Suda
ca5aab19b4 rootless: update docker info docs
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2019-06-03 19:41:50 +09:00
Brian Goff
51f27b1def
Merge pull request #39138 from AkihiroSuda/fix-rootless-issues-alternative-to-39024
dockerd: fix rootless detection (alternative to #39024)
2019-04-26 09:15:30 -07:00
Akihiro Suda
63a66b0eb0 rootless: optional support for lxc-user-nic SUID binary
lxc-user-nic can eliminate slirp overhead but needs /etc/lxc/lxc-usernet to be configured for the current user.

To use lxc-user-nic, $DOCKERD_ROOTLESS_ROOTLESSKIT_NET=lxc-user-nic also needs to be set.

This commit also bumps up RootlessKit from v0.3.0 to v0.4.0:
70e0502f32...e92d5e772e

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2019-04-25 23:54:30 +09:00
Akihiro Suda
3518383ed9 dockerd: fix rootless detection (alternative to #39024)
The `--rootless` flag had a couple of issues:
* #38702: euid=0, $USER="root" but no access to cgroup ("rootful" Docker in rootless Docker)
* #39009: euid=0 but $USER="docker" (rootful boot2docker)

To fix #38702, XDG dirs are ignored as in rootful Docker, unless the
dockerd is directly running under RootlessKit namespaces.

RootlessKit detection is implemented by checking whether `$ROOTLESSKIT_STATE_DIR` is set.

To fix #39009, the non-robust `$USER` check is now completely removed.

The entire logic can be illustrated as follows:

```
withRootlessKit := getenv("ROOTLESSKIT_STATE_DIR")
rootlessMode := withRootlessKit || cliFlag("--rootless")
honorXDG := withRootlessKit
useRootlessKitDockerProxy := withRootlessKit
removeCgroupSpec := rootlessMode
adjustOOMScoreAdj := rootlessMode
```

Close #39024
Fix #38702 #39009

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2019-04-25 16:47:01 +09:00
Akihiro Suda
f0b405fbda rootless: expose ports automatically
Now `docker run -p` ports can be exposed to the host namespace automatically when `dockerd-rootless.sh` is launched with
`--userland-proxy --userland-proxy-path $(which rootlesskit-docker-proxy)`.
This is akin to how Docker for Mac/Win works with `--userland-proxy-path=/path/to/vpnkit-expose-port`.

The port number on the host namespace needs to be set to >= 1024.
SCTP ports are currently unsupported.

RootlessKit changes: 7bbbc48a6f...ed26714429

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
2019-03-21 02:44:08 +09:00
Akihiro Suda
ec87479b7e allow running dockerd in an unprivileged user namespace (rootless mode)
Please refer to `docs/rootless.md`.

TLDR:
 * Make sure `/etc/subuid` and `/etc/subgid` contain the entry for you
 * `dockerd-rootless.sh --experimental`
 * `docker -H unix://$XDG_RUNTIME_DIR/docker.sock run ...`

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
2019-02-04 00:24:27 +09:00