Add some basic questions to the FAQ

- Adds some basic questions and answers to the FAQ about supported CPU
  architectures and binary formats.
- Adds a variable and shortcode for the minimium required Linux version.

config.toml

@@ -137,3 +137,6 @@ no = 'Sorry to hear that. Please <a href="https://github.com/USERNAME/REPOSITORY
     url = "https://groups.google.com/forum/#!forum/gvisor-dev"
     icon = "fa fa-envelope"
     desc = "Get info on the development of gVisor"
+
+[params.vars]
+required_linux = "3.17+"

content/docs/includes/install_gvisor.md

@@ -1,5 +1,3 @@
-> Note: gVisor supports only x86\_64 and requires Linux 3.17+.
-
 The easiest way to get `runsc` is from the [latest nightly
 build][latest-nightly]. After you download the binary, check it against the
 SHA512 [checksum file][latest-hash].

content/docs/user_guide/FAQ.md

@@ -3,6 +3,32 @@ title = "FAQ"
 weight = 1000
 +++
 
+### What operating systems are supported?
+
+gVisor requires Linux {{< required_linux >}}.
+
+### What CPU architectures are supported?
+
+gVisor currently supports [x86_64/AMD64](https://en.wikipedia.org/wiki/X86-64)
+compatible processors.
+
+### Do I need to modify my Linux application to use gVisor?
+
+No. gVisor is capable of running unmodified Linux binaries.
+
+### What binary formats does gVisor support?
+
+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) CPU architecture.
+
+### Can I run Docker images using gVisor.
+
+Yes. Please see the [Docker Quick Start](/docs/user_guide/docker/).
+
+## Troubleshooting
+
 ### My container runs fine with `runc` but fails with `runsc`
 
 If you’re having problems running a container with `runsc` it’s most likely due

content/docs/user_guide/docker.md

@@ -7,6 +7,8 @@ gVisor.
 
 ## Install gVisor
 
+> Note: gVisor supports only x86\_64 and requires Linux {{< required_linux >}}.
+
 {{% readfile file="docs/includes/install_gvisor.md" markdown="true" %}}
 
 ## Configuring Docker

content/docs/user_guide/oci.md

@@ -7,6 +7,8 @@ container using the runtime directly with the default platform.
 
 ## Install gVisor
 
+> Note: gVisor supports only x86\_64 and requires Linux {{< required_linux >}}.
+
 {{% readfile file="docs/includes/install_gvisor.md" markdown="true" %}}
 
 ## Run an OCI compatible container

layouts/shortcodes/required_linux.html

@@ -0,0 +1 @@
+{{ .Site.Params.vars.required_linux }}