23488312f5
The logic to decide which cgroup driver is used is currently based on the
cgroup path that the host provides. This requires host and guest to use the
same cgroup driver. If the guest uses kata-agent as init, then systemd can't be
used as the cgroup driver. If the host requests a systemd cgroup, this
currently results in a rustjail panic:
thread 'tokio-runtime-worker' panicked at 'called `Result::unwrap()` on an `Err` value: I/O error: No such file or directory (os error 2)
Caused by:
No such file or directory (os error 2)', rustjail/src/cgroups/systemd/manager.rs:44:51
stack backtrace:
0: 0x7ff0fe77a793 - std::backtrace_rs::backtrace::libunwind::trace::h8c197fa9a679d134
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7ff0fe77a793 - std::backtrace_rs::backtrace::trace_unsynchronized::h9ee19d58b6d5934a
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7ff0fe77a793 - std::sys_common::backtrace::_print_fmt::h4badc450600fc417
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:65:5
3: 0x7ff0fe77a793 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::had334ddb529a2169
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7ff0fdce815e - core::fmt::write::h1aa7694f03e44db2
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/fmt/mod.rs:1209:17
5: 0x7ff0fe74e0c4 - std::io::Write::write_fmt::h61b2bdc565be41b5
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/io/mod.rs:1682:15
6: 0x7ff0fe77cd3f - std::sys_common::backtrace::_print::h4ec69798b72ff254
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:47:5
7: 0x7ff0fe77cd3f - std::sys_common::backtrace::print::h0e6c02048dec3c77
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:34:9
8: 0x7ff0fe77c93f - std::panicking::default_hook::{{closure}}::hcdb7e705dc37ea6e
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:267:22
9: 0x7ff0fe77d9b8 - std::panicking::default_hook::he03a933a0f01790f
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:286:9
10: 0x7ff0fe77d9b8 - std::panicking::rust_panic_with_hook::he26b680bfd953008
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:688:13
11: 0x7ff0fe77d482 - std::panicking::begin_panic_handler::{{closure}}::h559120d2dd1c6180
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:579:13
12: 0x7ff0fe77d3ec - std::sys_common::backtrace::__rust_end_short_backtrace::h36db621fc93b005a
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:137:18
13: 0x7ff0fe77d3c1 - rust_begin_unwind
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:575:5
14: 0x7ff0fda52ee2 - core::panicking::panic_fmt::he7679b415d25c5f4
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/panicking.rs:65:14
15: 0x7ff0fda53182 - core::result::unwrap_failed::hb71caff146724b6b
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/result.rs:1791:5
16: 0x7ff0fe5bd738 - <rustjail::cgroups::systemd::manager::Manager as rustjail::cgroups::Manager>::apply::hd46958d9d807d2ca
17: 0x7ff0fe606d80 - <rustjail::container::LinuxContainer as rustjail::container::BaseContainer>::start::{{closure}}::h1de806d91fcb878f
18: 0x7ff0fe604a76 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h1749c148adcc235f
19: 0x7ff0fdc0c992 - kata_agent::rpc::AgentService::do_create_container::{{closure}}::{{closure}}::hc1b87a15dfdf2f64
20: 0x7ff0fdb80ae4 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h846a8c9e4fb67707
21: 0x7ff0fe3bb816 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h53de16ff66ed3972
22: 0x7ff0fdb519cb - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h1cbece980286c0f4
23: 0x7ff0fdf4019c - <tokio::future::poll_fn::PollFn<F> as core::future::future::Future>::poll::hc8e72d155feb8d1f
24: 0x7ff0fdfa5fd8 - tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut::h0a407ffe2559449a
25: 0x7ff0fdf033a1 - tokio::runtime::task::raw::poll::h1045d9f1db9742de
26: 0x7ff0fe7a8ce2 - tokio::runtime::scheduler::multi_thread::worker::Context::run_task::h4924ae3464af7fbd
27: 0x7ff0fe7afb85 - tokio::runtime::task::raw::poll::h5c843be39646b833
28: 0x7ff0fe7a05ee - std::sys_common::backtrace::__rust_begin_short_backtrace::ha7777c55b98a9bd1
29: 0x7ff0fe7a9bdb - core::ops::function::FnOnce::call_once{{vtable.shim}}::h27ec83c953360cdd
30: 0x7ff0fe7801d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hed812350c5aef7a8
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/alloc/src/boxed.rs:1987:9
31: 0x7ff0fe7801d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc7df8e435a658960
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/alloc/src/boxed.rs:1987:9
32: 0x7ff0fe7801d5 - std::sys::unix:🧵:Thread:🆕:thread_start::h575491a8a17dbb33
at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys/unix/thread.rs:108:17
Forward the value of "init_mode" to AgentService, so that we can force cgroupfs
when systemd is unavailable.
Fixes: #5779
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
Kata Containers
Welcome to Kata Containers!
This repository is the home of the Kata Containers code for the 2.0 and newer releases.
If you want to learn about Kata Containers, visit the main Kata Containers website.
Introduction
Kata Containers is an open source project and community working to build a standard implementation of lightweight Virtual Machines (VMs) that feel and perform like containers, but provide the workload isolation and security advantages of VMs.
License
The code is licensed under the Apache 2.0 license. See the license file for further details.
Platform support
Kata Containers currently runs on 64-bit systems supporting the following technologies:
| Architecture | Virtualization technology |
|---|---|
x86_64, amd64 |
Intel VT-x, AMD SVM |
aarch64 ("arm64") |
ARM Hyp |
ppc64le |
IBM Power |
s390x |
IBM Z & LinuxONE SIE |
Hardware requirements
The Kata Containers runtime provides a command to determine if your host system is capable of running and creating a Kata Container:
$ kata-runtime check
Notes:
This command runs a number of checks including connecting to the network to determine if a newer release of Kata Containers is available on GitHub. If you do not wish this to check to run, add the
--no-network-checksoption.By default, only a brief success / failure message is printed. If more details are needed, the
--verboseflag can be used to display the list of all the checks performed.If the command is run as the
rootuser additional checks are run (including checking if another incompatible hypervisor is running). When running asroot, network checks are automatically disabled.
Getting started
See the installation documentation.
Documentation
See the official documentation including:
Configuration
Kata Containers uses a single configuration file which contains a number of sections for various parts of the Kata Containers system including the runtime, the agent and the hypervisor.
Hypervisors
See the hypervisors document and the Hypervisor specific configuration details.
Community
To learn more about the project, its community and governance, see the community repository. This is the first place to go if you wish to contribute to the project.
Getting help
See the community section for ways to contact us.
Raising issues
Please raise an issue in this repository.
Note: If you are reporting a security issue, please follow the vulnerability reporting process
Developers
See the developer guide.
Components
Main components
The table below lists the core parts of the project:
| Component | Type | Description |
|---|---|---|
| runtime | core | Main component run by a container manager and providing a containerd shimv2 runtime implementation. |
| runtime-rs | core | The Rust version runtime. |
| agent | core | Management process running inside the virtual machine / POD that sets up the container environment. |
dragonball |
core | An optional built-in VMM brings out-of-the-box Kata Containers experience with optimizations on container workloads |
| documentation | documentation | Documentation common to all components (such as design and install documentation). |
| tests | tests | Excludes unit tests which live with the main code. |
Additional components
The table below lists the remaining parts of the project:
| Component | Type | Description |
|---|---|---|
| packaging | infrastructure | Scripts and metadata for producing packaged binaries (components, hypervisors, kernel and rootfs). |
| kernel | kernel | Linux kernel used by the hypervisor to boot the guest image. Patches are stored here. |
| osbuilder | infrastructure | Tool to create "mini O/S" rootfs and initrd images and kernel for the hypervisor. |
agent-ctl |
utility | Tool that provides low-level access for testing the agent. |
kata-ctl |
utility | Tool that provides advanced commands and debug facilities. |
trace-forwarder |
utility | Agent tracing helper. |
runk |
utility | Standard OCI container runtime based on the agent. |
ci |
CI | Continuous Integration configuration files and scripts. |
katacontainers.io |
Source for the katacontainers.io site. |
Packaging and releases
Kata Containers is now available natively for most distributions. However, packaging scripts and metadata are still used to generate snap and GitHub releases. See the components section for further details.
Glossary of Terms
See the glossary of terms related to Kata Containers.