Synthetic sockets do not have the race condition issue in VFS2, and we will
get rid of privateunixsocket as well.
Fixes#1200.
PiperOrigin-RevId: 310386474
We can register any number of tables with any number of architectures, and
need not limit the definitions to the architecture in question. This allows
runsc to generate documentation for all architectures simultaneously.
Similarly, this simplifies the VFSv2 patching process.
PiperOrigin-RevId: 310224827
Previously we unconditionally failed to cleanup the networking files
(hostname, resolve.conf, hosts), and failed to cleanup the netns, etc on
partial setup failure.
We can drop the iptables commands from cleanup, as the routes
automatically go away when the device is deleted. Those commands were
failing previously.
Forward signals to the container, allowing it to exit normally when a
signal is received, and then for runsc to run the cleanup. This doesn't
cover cleanup when runsc is signalled before the container start, it
covers the most common case.
Fixes#2539Fixes#2540
Several tests are passing after getting TestAppExitStatus (run /bin/true)
changes. Make versions that run via VFS2 so that we know what is and isn't
working.
In addition, fix bug in VFSFile ReadFull. For the TestExePath test in
container_test.go, the case "unmasked" will return 0 bytes read with no
EOF err, causing the ReadFull call to spin.
PiperOrigin-RevId: 308428126
This change includes:
- Modifications to loader_test.go to get TestCreateMountNamespace to
pass with VFS2.
- Changes necessary to get TestHelloWorld in image tests to pass with
VFS2. This means runsc can run the hello-world container with docker
on VSF2.
Note: Containers that use sockets will not run with these changes.
See "//test/image/...". Any tests here with sockets currently fail
(which is all of them but HelloWorld).
PiperOrigin-RevId: 308363072
This is needed to set up host fds passed through a Unix socket. Note that
the host package depends on kernel, so we cannot set up the hostfs mount
directly in Kernel.Init as we do for sockfs and pipefs.
Also, adjust sockfs to make its setup look more like hostfs's and pipefs's.
PiperOrigin-RevId: 308274053
This change adds a layer of abstraction around the internal Docker APIs,
and eliminates all direct dependencies on Dockerfiles in the infrastructure.
A subsequent change will automated the generation of local images (with
efficient caching). Note that this change drops the use of bazel container
rules, as that experiment does not seem to be viable.
PiperOrigin-RevId: 308095430
This change renames the tools/images directory to tools/vm for clarity, and
adds a functional vm_test. Sharding is also added to the same test, and some
documentation added around key flags & variables to describe how they work.
Subsequent changes will add vm_tests for other cases, such as the runtime tests.
PiperOrigin-RevId: 307492245
Included:
- loader_test.go RunTest and TestStartSignal VFS2
- container_test.go TestAppExitStatus on VFS2
- experimental flag added to runsc to turn on VFS2
Note: shared mounts are not yet supported.
PiperOrigin-RevId: 307070753
Move TODO to #238 so that proper synchronization of operations is handled
when we create the urpc client.
Issue #238Fixes#512
PiperOrigin-RevId: 305383924
Suppose I start a runsc container using kvm platform like this:
$ sudo runsc --debug=true --debug-log=1.txt --platform=kvm run rootbash
The donating FD and the corresponding cmdline for runsc-sandbox is:
D0313 17:50:12.608203 44389 x:0] Donating FD 3: "1.txt"
D0313 17:50:12.608214 44389 x:0] Donating FD 4: "control_server_socket"
D0313 17:50:12.608224 44389 x:0] Donating FD 5: "|0"
D0313 17:50:12.608229 44389 x:0] Donating FD 6: "/home/ziqian.lzq/bundle/bash/runsc/config.json"
D0313 17:50:12.608234 44389 x:0] Donating FD 7: "|1"
D0313 17:50:12.608238 44389 x:0] Donating FD 8: "sandbox IO FD"
D0313 17:50:12.608242 44389 x:0] Donating FD 9: "/dev/kvm"
D0313 17:50:12.608246 44389 x:0] Donating FD 10: "/dev/stdin"
D0313 17:50:12.608249 44389 x:0] Donating FD 11: "/dev/stdout"
D0313 17:50:12.608253 44389 x:0] Donating FD 12: "/dev/stderr"
D0313 17:50:12.608257 44389 x:0] Starting sandbox: /proc/self/exe
[runsc-sandbox --root=/run/containerd/runsc/default --debug=true --log=
--max-threads=256 --reclaim-period=5 --log-format=text --debug-log=1.txt
--debug-log-format=text --file-access=exclusive --overlay=false
--fsgofer-host-uds=false --network=sandbox --log-packets=false
--platform=kvm --strace=false --strace-syscalls=--strace-log-size=1024
--watchdog-action=Panic --panic-signal=-1 --profile=false --net-raw=true
--num-network-channels=1 --rootless=false --alsologtostderr=false
--ref-leak-mode=disabled --gso=true --software-gso=true
--overlayfs-stale-read=false --shared-volume= --debug-log-fd=3
--panic-signal=15 boot --bundle=/home/ziqian.lzq/bundle/bash/runsc
--controller-fd=4 --mounts-fd=5 --spec-fd=6 --start-sync-fd=7 --io-fds=8
--device-fd=9 --stdio-fds=10 --stdio-fds=11 --stdio-fds=12 --pidns=true
--setup-root --cpu-num 32 --total-memory 4294967296 rootbash]
Note stdioFDs starts from 10 with kvm platform and stderr's FD is 12.
If I restore a container from the checkpoint image which is derived
by checkpointing the above rootbash container, but either omit the
platform switch or specify to use ptrace platform explicitely:
$ sudo runsc --debug=true --debug-log=1.txt restore --image-path=some_path restored_rootbash
the donating FD and corresponding cmdline for runsc-sandbox is:
D0313 17:50:15.258632 44452 x:0] Donating FD 3: "1.txt"
D0313 17:50:15.258640 44452 x:0] Donating FD 4: "control_server_socket"
D0313 17:50:15.258645 44452 x:0] Donating FD 5: "|0"
D0313 17:50:15.258648 44452 x:0] Donating FD 6: "/home/ziqian.lzq/bundle/bash/runsc/config.json"
D0313 17:50:15.258653 44452 x:0] Donating FD 7: "|1"
D0313 17:50:15.258657 44452 x:0] Donating FD 8: "sandbox IO FD"
D0313 17:50:15.258661 44452 x:0] Donating FD 9: "/dev/stdin"
D0313 17:50:15.258675 44452 x:0] Donating FD 10: "/dev/stdout"
D0313 17:50:15.258680 44452 x:0] Donating FD 11: "/dev/stderr"
D0313 17:50:15.258684 44452 x:0] Starting sandbox: /proc/self/exe
[runsc-sandbox --root=/run/containerd/runsc/default --debug=true --log=
--max-threads=256 --reclaim-period=5 --log-format=text --debug-log=1.txt
--debug-log-format=text --file-access=exclusive --overlay=false
--fsgofer-host-uds=false --network=sandbox --log-packets=false
--platform=ptrace --strace=false --strace-syscalls=
--strace-log-size=1024 --watchdog-action=Panic --panic-signal=-1
--profile=false --net-raw=true --num-network-channels=1 --rootless=false
--alsologtostderr=false --ref-leak-mode=disabled --gso=true
--software-gso=true --overlayfs-stale-read=false --shared-volume=
--debug-log-fd=3 --panic-signal=15 boot
--bundle=/home/ziqian.lzq/bundle/bash/runsc --controller-fd=4
--mounts-fd=5 --spec-fd=6 --start-sync-fd=7 --io-fds=8 --stdio-fds=9
--stdio-fds=10 --stdio-fds=11 --setup-root --cpu-num 32 --total-memory
4294967296 restored_rootbash]
Note this time, stdioFDs starts from 9 and stderr's FD is 11(so the
saved host.descritor.origFD which is 12 for stderr is no longer valid).
For the three host FD based files, The s.Dev and s.Ino derived from
fstat(fd) shall all be the same and since the two fields are used
as device.MultiDeviceKey, the host.inodeFileState.sattr.InodeId which is
the value of MultiDevice.Map(MultiDeviceKey), shall also all be the same.
Note that for MultiDevice m, m.cache records the mapping of key to value
and m.rcache records the mapping of value to key. If same value doesn't
map to the same key, it will panic on restore.
Now that stderr's origFD 12 is no longer valid(it happens to be
/memfd:runsc-memory in my test on restore), the s.Dev and s.Ino derived
from fstat(fd=12) in host.inodeFileState.afterLoad() will neither be
correct. But its InodeID is still the same as saved, MultiDevice.Load()
will complain about the same value(InodeID) being mapped to different
keys (different from stdin and stdout's) and panic with: "MultiDevice's
caches are inconsistent".
Solve this problem by making sure stdioFDs for root container's init
task are always the same on initial start and on restore time, no matter
what cmdline user has used: debug log specified or not, platform changed
or not etc. shall not affect the ability to restore.
Fixes#1844.
In the case of other signals (preemption), inject a normal bounce and
defer the signal until the vCPU has been returned from guest mode.
PiperOrigin-RevId: 303799678
Using the host-defined file owner matches VFS1. It is more correct to use the
host-defined mode, since the cached value may become out of date. However,
kernfs.Inode.Mode() does not return an error--other filesystems on kernfs are
in-memory so retrieving mode should not fail. Therefore, if the host syscall
fails, we rely on a cached value instead.
Updates #1672.
PiperOrigin-RevId: 303220864
utimensat is used by hostfs for setting timestamps on imported fds. Previously,
this would crash the sandbox since utimensat was not allowed.
Correct the VFS2 version of hostfs to match the call in VFS1.
PiperOrigin-RevId: 301970121
- When setting up the virtual filesystem, mount a host.filesystem to contain
all files that need to be imported.
- Make read/preadv syscalls to the host in cases where preadv2 may not be
supported yet (likewise for writing).
- Make save/restore functions in kernel/kernel.go return early if vfs2 is
enabled.
PiperOrigin-RevId: 300922353
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