Reduce the number of steps to get started with gVisor

Streamline instruction for the common case.

PiperOrigin-RevId: 332488910

4 files changed, 116 insertions, 102 deletions

diff --git a/g3doc/user_guide/FAQ.md b/g3doc/user_guide/FAQ.md
index 8b5cff0ab..514fe3918 100644
--- a/g3doc/user_guide/FAQ.md
+++ b/g3doc/user_guide/FAQ.md
@@ -74,11 +74,10 @@ 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 and the owner is correct on the `runsc` binary.
+Make sure that permissions is correct on the `runsc` binary.
 
 ```bash
-sudo chown root:root /usr/local/bin/runsc
-sudo chmod 0755 /usr/local/bin/runsc
+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}
diff --git a/g3doc/user_guide/install.md b/g3doc/user_guide/install.md
index 9afdd264d..abb9e8582 100644
--- a/g3doc/user_guide/install.md
+++ b/g3doc/user_guide/install.md
@@ -5,6 +5,68 @@
 > Note: gVisor supports only x86\_64 and requires Linux 4.14.77+
 > ([older Linux](./networking.md#gso)).
 
+## Install latest release {#install-latest}
+
+To download and install the latest release manually follow these steps:
+
+```bash
+(
+  set -e
+  URL=https://storage.googleapis.com/gvisor/releases/release/latest
+  wget ${URL}/runsc ${URL}/runsc.sha512
+  sha512sum -c runsc.sha512
+  rm -f runsc.sha512
+  sudo mv runsc /usr/local/bin
+  sudo chmod a+rx /usr/local/bin/runsc
+)
+```
+
+To install gVisor with Docker, run the following commands:
+
+```bash
+/usr/local/bin/runsc install
+sudo systemctl restart docker
+docker run --rm --runtime=runsc hello-world
+```
+
+For more details about using gVisor with Docker, see
+[Docker Quick Start](./quick_start/docker.md)
+
+Note: It is important to copy `runsc` to a location that is readable and
+executable to all users, since `runsc` executes itself as user `nobody` to avoid
+unnecessary privileges. The `/usr/local/bin` directory is a good place to put
+the `runsc` binary.
+
+## Install from an `apt` repository
+
+First, appropriate dependencies must be installed to allow `apt` to install
+packages via https:
+
+```bash
+sudo apt-get update && \
+sudo apt-get install -y \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    gnupg-agent \
+    software-properties-common
+```
+
+Next, the configure the key used to sign archives and the repository:
+
+```bash
+curl -fsSL https://gvisor.dev/archive.key | sudo apt-key add -
+sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases release main"
+```
+
+Now the runsc package can be installed:
+
+```bash
+sudo apt-get update && sudo apt-get install -y runsc
+```
+
+If you have Docker installed, it will be automatically configured.
+
 ## Versions
 
 The `runsc` binaries and repositories are available in multiple versions and
@@ -21,12 +83,16 @@ Binaries are available for every commit on the `master` branch, and are
 available at the following URL:
 
 `https://storage.googleapis.com/gvisor/releases/master/latest/runsc`
+`https://storage.googleapis.com/gvisor/releases/master/latest/runsc.sha512`
 
-Checksums for the release binary are at:
+You can use this link with the steps described in
+[Install latest release](#install-latest).
 
-`https://storage.googleapis.com/gvisor/releases/master/latest/runsc.sha512`
+For `apt` installation, use the `master` to configure the repository:
 
-For `apt` installation, use the `master` as the `${DIST}` below.
+```bash
+sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases master main"
+```
 
 ### Nightly
 
@@ -34,18 +100,22 @@ Nightly releases are built most nights from the master branch, and are available
 at the following URL:
 
 `https://storage.googleapis.com/gvisor/releases/nightly/latest/runsc`
-
-Checksums for the release binary are at:
-
 `https://storage.googleapis.com/gvisor/releases/nightly/latest/runsc.sha512`
 
+You can use this link with the steps described in
+[Install latest release](#install-latest).
+
 Specific nightly releases can be found at:
 
 `https://storage.googleapis.com/gvisor/releases/nightly/${yyyy-mm-dd}/runsc`
 
 Note that a release may not be available for every day.
 
-For `apt` installation, use the `nightly` as the `${DIST}` below.
+For `apt` installation, use the `nightly` to configure the repository:
+
+```bash
+sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases nightly main"
+```
 
 ### Latest release
 
@@ -53,105 +123,47 @@ The latest official release is available at the following URL:
 
 `https://storage.googleapis.com/gvisor/releases/release/latest`
 
-For `apt` installation, use the `release` as the `${DIST}` below.
-
-### Specific release
-
-A given release release is available at the following URL:
-
-`https://storage.googleapis.com/gvisor/releases/release/${yyyymmdd}`
-
-See the [releases][releases] page for information about specific releases.
-
-For `apt` installation of a specific release, which may include point updates,
-use the date of the release, e.g. `${yyyymmdd}`, as the `${DIST}` below.
-
-> Note: only newer releases may be available as `apt` repositories.
-
-### Point release
-
-A given point release is available at the following URL:
-
-`https://storage.googleapis.com/gvisor/releases/release/${yyyymmdd}.${rc}`
-
-Note that `apt` installation of a specific point release is not supported.
-
-## Install from an `apt` repository
+You can use this link with the steps described in
+[Install latest release](#install-latest).
 
-First, appropriate dependencies must be installed to allow `apt` to install
-packages via https:
+For `apt` installation, use the `release` to configure the repository:
 
 ```bash
-sudo apt-get update && \
-sudo apt-get install -y \
-    apt-transport-https \
-    ca-certificates \
-    curl \
-    gnupg-agent \
-    software-properties-common
+sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases release main"
 ```
 
-Next, the key used to sign archives should be added to your `apt` keychain:
-
-```bash
-curl -fsSL https://gvisor.dev/archive.key | sudo apt-key add -
-```
+### Specific release
 
-Based on the release type, you will need to substitute `${DIST}` below, using
-one of:
+A given release release is available at the following URL:
 
-*   `master`: For HEAD.
-*   `nightly`: For nightly releases.
-*   `release`: For the latest release.
-*   `${yyyymmdd}`: For a specific releases (see above).
+`https://storage.googleapis.com/gvisor/releases/release/${yyyymmdd}`
 
-The repository for the release you wish to install should be added:
+You can use this link with the steps described in
+[Install latest release](#install-latest).
 
-```bash
-sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases ${DIST} main"
-```
+See the [releases](https://github.com/google/gvisor/releases) page for
+information about specific releases.
 
-For example, to install the latest official release, you can use:
+For `apt` installation of a specific release, which may include point updates,
+use the date of the release for repository, e.g. `${yyyymmdd}`.
 
 ```bash
-sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases release main"
+sudo add-apt-repository "deb https://storage.googleapis.com/gvisor/releases yyyymmdd main"
 ```
 
-Now the runsc package can be installed:
-
-```bash
-sudo apt-get update && sudo apt-get install -y runsc
-```
+> Note: only newer releases may be available as `apt` repositories.
 
-If you have Docker installed, it will be automatically configured.
+### Point release
 
-## Install directly
+A given point release is available at the following URL:
 
-The binary URLs provided above can be used to install directly. For example, the
-latest nightly binary can be downloaded, validated, and placed in an appropriate
-location by running:
+`https://storage.googleapis.com/gvisor/releases/release/${yyyymmdd}.${rc}`
 
-```bash
-(
-  set -e
-  URL=https://storage.googleapis.com/gvisor/releases/nightly/latest
-  wget ${URL}/runsc
-  wget ${URL}/runsc.sha512
-  sha512sum -c runsc.sha512
-  rm -f runsc.sha512
-  sudo mv runsc /usr/local/bin
-  sudo chown root:root /usr/local/bin/runsc
-  sudo chmod 0755 /usr/local/bin/runsc
-)
-```
+You can use this link with the steps described in
+[Install latest release](#install-latest).
 
-**It is important to copy this binary to a location that is accessible to all
-users, and ensure it is executable by all users**, since `runsc` executes itself
-as user `nobody` to avoid unnecessary privileges. The `/usr/local/bin` directory
-is a good place to put the `runsc` binary.
+Note that `apt` installation of a specific point release is not supported.
 
 After installation, try out `runsc` by following the
 [Docker Quick Start](./quick_start/docker.md) or
 [OCI Quick Start](./quick_start/oci.md).
-
-[releases]: https://github.com/google/gvisor/releases
diff --git a/g3doc/user_guide/quick_start/docker.md b/g3doc/user_guide/quick_start/docker.md
index 6ad594ecc..ee842e453 100644
--- a/g3doc/user_guide/quick_start/docker.md
+++ b/g3doc/user_guide/quick_start/docker.md
@@ -22,18 +22,6 @@ named "runsc" by default.
 sudo runsc install
 ```
 
-You may also wish to install a runtime entry for debugging. The `runsc install`
-command can accept options that will be passed to the runtime when it is invoked
-by Docker.
-
-```bash
-sudo runsc install --runtime runsc-debug -- \
-  --debug \
-  --debug-log=/tmp/runsc-debug.log \
-  --strace \
-  --log-packets
-```
-
 You must restart the Docker daemon after installing the runtime. Typically this
 is done via `systemd`:
 
@@ -85,6 +73,21 @@ $ docker run --runtime=runsc -it ubuntu dmesg
 Note that this is easily replicated by an attacker so applications should never
 use `dmesg` to verify the runtime in a security sensitive context.
 
+## Options
+
+You may also wish to install a runtime entry with different options. The `runsc
+install` command can accept flags that will be passed to the runtime when it is
+invoked by Docker. For example, to install a runtime with debugging enabled, run
+the following:
+
+```bash
+sudo runsc install --runtime runsc-debug -- \
+  --debug \
+  --debug-log=/tmp/runsc-debug.log \
+  --strace \
+  --log-packets
+```
+
 Next, look at the different options available for gVisor: [platform][platforms],
 [network][networking], [filesystem][filesystem].
 
diff --git a/website/index.md b/website/index.md
index 84f877d49..c6cd477c2 100644
--- a/website/index.md
+++ b/website/index.md
@@ -5,7 +5,7 @@
       <div class="col-md-6">
         <p>gVisor is an <b>application kernel</b> for <b>containers</b> that provides efficient defense-in-depth anywhere.</p>
         <p style="margin-top: 20px;">
-          <a class="btn" href="/docs/user_guide/quick_start/docker/">Quick start&nbsp;<i class="fas fa-arrow-alt-circle-right ml-2"></i></a>
+          <a class="btn" href="/docs/user_guide/install/">Get started&nbsp;<i class="fas fa-arrow-alt-circle-right ml-2"></i></a>
           <a class="btn" href="/docs/">Learn More&nbsp;<i class="fas fa-arrow-alt-circle-right ml-2"></i></a>
         </p>
       </div>