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-# FAQ
-
-[TOC]
-
-### What operating systems are supported? {#supported-os}
-
-Today, gVisor requires Linux.
-
-### What CPU architectures are supported? {#supported-cpus}
-
-gVisor currently supports [x86_64/AMD64](https://en.wikipedia.org/wiki/X86-64)
-compatible processors. Preliminary support is also available for
-[ARM64](https://en.wikipedia.org/wiki/ARM_architecture#AArch64).
-
-### Do I need to modify my Linux application to use gVisor? {#modify-app}
-
-No. gVisor is capable of running unmodified Linux binaries.
-
-### What binary formats does gVisor support? {#supported-binaries}
-
-gVisor supports Linux
-[ELF](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) binaries.
-
-Binaries run in gVisor should be built for the
-[AMD64](https://en.wikipedia.org/wiki/X86-64) or
-[AArch64](https://en.wikipedia.org/wiki/ARM_architecture#AArch64) CPU
-architectures.
-
-### Can I run Docker images using gVisor? {#docker-images}
-
-Yes. Please see the [Docker Quick Start][docker].
-
-### Can I run Kubernetes pods using gVisor? {#k8s-pods}
-
-Yes. Please see the [Kubernetes Quick Start][k8s].
-
-### What's the security model? {#security-model}
-
-See the [Security Model][security-model].
-
-## Troubleshooting
-
-### My container runs fine with `runc` but fails with `runsc` {#app-compatibility}
-
-If you’re having problems running a container with `runsc` it’s most likely due
-to a compatibility issue or a missing feature in gVisor. See
-[Debugging][debugging].
-
-### When I run my container, docker fails with: `open /run/containerd/.../<containerid>/log.json: no such file or directory` {#memfd-create}
-
-You are using an older version of Linux which doesn't support `memfd_create`.
-
-This is tracked in [bug #268](https://gvisor.dev/issue/268).
-
-### When I run my container, docker fails with: `flag provided but not defined: -console` {#old-docker}
-
-You're using an old version of Docker. See [Docker Quick Start][docker].
-
-### I can’t see a file copied with: `docker cp` {#fs-cache}
-
-For performance reasons, gVisor caches directory contents, and therefore it may
-not realize a new file was copied to a given directory. To invalidate the cache
-and force a refresh, create a file under the directory in question and list the
-contents again.
-
-As a workaround, shared root filesystem can be enabled. See
-[Filesystem][filesystem].
-
-This bug is tracked in [bug #4](https://gvisor.dev/issue/4).
-
-Note that `kubectl cp` works because it does the copy by exec'ing inside the
-sandbox, and thus gVisor's internal cache is made aware of the new files and
-directories.
-
-### I'm getting an error like: `panic: unable to attach: operation not permitted` or `fork/exec /proc/self/exe: invalid argument: unknown` {#runsc-perms}
-
-Make sure that permissions is correct on the `runsc` binary.
-
-```bash
-sudo chmod a+rx /usr/local/bin/runsc
-```
-
-### I'm getting an error like `mount submount "/etc/hostname": creating mount with source ".../hostname": input/output error: unknown.` {#memlock}
-
-There is a bug in Linux kernel versions 5.1 to 5.3.15, 5.4.2, and 5.5. Upgrade
-to a newer kernel or add the following to
-`/lib/systemd/system/containerd.service` as a workaround.
-
-```
-LimitMEMLOCK=infinity
-```
-
-And run `systemctl daemon-reload && systemctl restart containerd` to restart
-containerd.
-
-See [issue #1765](https://gvisor.dev/issue/1765) for more details.
-
-### I'm getting an error like `RuntimeHandler "runsc" not supported` {#runtime-handler}
-
-This error indicates that the Kubernetes CRI runtime was not set up to handle
-`runsc` as a runtime handler. Please ensure that containerd configuration has
-been created properly and containerd has been restarted. See the
-[containerd quick start](containerd/quick_start.md) for more details.
-
-If you have ensured that containerd has been set up properly and you used
-kubeadm to create your cluster please check if Docker is also installed on that
-system. Kubeadm prefers using Docker if both Docker and containerd are
-installed.
-
-Please recreate your cluster and set the `--cri-socket` option on kubeadm
-commands. For example:
-
-```bash
-kubeadm init --cri-socket=/var/run/containerd/containerd.sock ...
-```
-
-To fix an existing cluster edit the `/var/lib/kubelet/kubeadm-flags.env` file
-and set the `--container-runtime` flag to `remote` and set the
-`--container-runtime-endpoint` flag to point to the containerd socket. e.g.
-`/var/run/containerd/containerd.sock`.
-
-### My container cannot resolve another container's name when using Docker user defined bridge {#docker-bridge}
-
-This is normally indicated by errors like `bad address 'container-name'` when
-trying to communicate to another container in the same network.
-
-Docker user defined bridge uses an embedded DNS server bound to the loopback
-interface on address 127.0.0.10. This requires access to the host network in
-order to communicate to the DNS server. runsc network is isolated from the host
-and cannot access the DNS server on the host network without breaking the
-sandbox isolation. There are a few different workarounds you can try:
-
-*   Use default bridge network with `--link` to connect containers. Default
-    bridge doesn't use embedded DNS.
-*   Use [`--network=host`][host-net] option in runsc, however beware that it
-    will use the host network stack and is less secure.
-*   Use IPs instead of container names.
-*   Use [Kubernetes][k8s]. Container name lookup works fine in Kubernetes.
-
-### I'm getting an error like `dial unix /run/containerd/s/09e4...8cff: connect: connection refused: unknown` {#shim-connect}
-
-This error may happen when using `gvisor-containerd-shim` with a `containerd`
-that does not contain the fix for [CVE-2020-15257]. The resolve the issue,
-update containerd to 1.3.9 or 1.4.3 (or newer versions respectively).
-
-[security-model]: /docs/architecture_guide/security/
-[host-net]: /docs/user_guide/networking/#network-passthrough
-[debugging]: /docs/user_guide/debugging/
-[filesystem]: /docs/user_guide/filesystem/
-[docker]: /docs/user_guide/quick_start/docker/
-[k8s]: /docs/user_guide/quick_start/kubernetes/
-[CVE-2020-15257]: https://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4