Finish writing about Garage features, and fix from-source instructions

3 files changed, 106 insertions, 45 deletions

diff --git a/doc/book/cookbook/exposing-websites.md b/doc/book/cookbook/exposing-websites.md
index be462dc9..5f6a5a28 100644
--- a/doc/book/cookbook/exposing-websites.md
+++ b/doc/book/cookbook/exposing-websites.md
@@ -5,12 +5,14 @@ weight = 25
 
 ## Configuring a bucket for website access
 
-There are two methods to expose buckets as website:
+There are three methods to expose buckets as website:
 
 1. using the PutBucketWebsite S3 API call, which is allowed for access keys that have the owner permission bit set
 
 2. from the Garage CLI, by an adminstrator of the cluster
 
+3. using the Garage administration API
+
 The `PutBucketWebsite` API endpoint [is documented](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketWebsite.html) in the official AWS docs.
 This endpoint can also be called [using `aws s3api`](https://docs.aws.amazon.com/cli/latest/reference/s3api/put-bucket-website.html) on the command line.
 The website configuration supported by Garage is only a subset of the possibilities on Amazon S3: redirections are not supported, only the index document and error document can be specified.
diff --git a/doc/book/cookbook/from-source.md b/doc/book/cookbook/from-source.md
index 2b93da47..bacf93ab 100644
--- a/doc/book/cookbook/from-source.md
+++ b/doc/book/cookbook/from-source.md
@@ -20,57 +20,76 @@ sudo apt-get update
 sudo apt-get install build-essential
 ```
 
-## Using source from the Gitea repository (recommended)
+## Building from source from the Gitea repository
 
 The primary location for Garage's source code is the
-[Gitea repository](https://git.deuxfleurs.fr/Deuxfleurs/garage).
+[Gitea repository](https://git.deuxfleurs.fr/Deuxfleurs/garage),
+which contains all of the released versions as well as the code
+for the developpement of the next version.
 
-Clone the repository and build Garage with the following commands:
+Clone the repository and enter it as follows:
 
 ```bash
 git clone https://git.deuxfleurs.fr/Deuxfleurs/garage.git
 cd garage
-cargo build
 ```
 
-Be careful, as this will make a debug build of Garage, which will be extremely slow!
-To make a release build, invoke `cargo build --release` (this takes much longer).
+If you wish to build a specific version of Garage, check out the corresponding tag. For instance:
 
-The binaries built this way are found in `target/{debug,release}/garage`.
+```bash
+git tag  				# List available tags
+git checkout v0.8.0		# Change v0.8.0 with the version you wish to build
+```
 
-## Using source from `crates.io`
+Otherwise you will be building a developpement build from the `main` branch
+that includes all of the changes to be released in the next version.
+Be careful that such a build might be unstable or contain bugs,
+and could be incompatible with nodes that run stable versions of Garage.
 
-Garage's source code is published on `crates.io`, Rust's official package repository.
-This means you can simply ask `cargo` to download and build this source code for you:
+Finally, build Garage with the following command:
 
 ```bash
-cargo install garage
+cargo build --release
 ```
 
-That's all, `garage` should be in `$HOME/.cargo/bin`.
-
-You can add this folder to your `$PATH` or copy the binary somewhere else on your system.
-For instance:
+The binary built this way can now be found in `target/release/garage`.
+You may simply copy this binary to somewhere in your `$PATH` in order to
+have the `garage` command available in your shell, for instance:
 
 ```bash
-sudo cp $HOME/.cargo/bin/garage /usr/local/bin/garage
+sudo cp target/release/garage /usr/local/bin/garage
 ```
 
+If you are planning to develop Garage,
+you might be interested in producing debug builds, which compile faster but run slower:
+this can be done by removing the `--release` flag, and the resulting build can then
+be found in `target/debug/garage`.
 
-## Selecting features to activate in your build
+## List of available Cargo feature flags
 
-Garage supports a number of compilation options in the form of Cargo features,
+Garage supports a number of compilation options in the form of Cargo feature flags,
 which can be used to provide builds adapted to your system and your use case.
-The following features are available:
-
-| Feature | Enabled | Description |
-| ------- | ------- | ----------- |
-| `bundled-libs` | BY DEFAULT | Use bundled version of sqlite3, zstd, lmdb and libsodium |
-| `system-libs` | optional | Use system version of sqlite3, zstd, lmdb and libsodium if available (exclusive with `bundled-libs`, build using `cargo build --no-default-features --features system-libs`) |
-| `k2v` | optional | Enable the experimental K2V API (if used, all nodes on your Garage cluster must have it enabled as well) |
-| `kubernetes-discovery` | optional | Enable automatic registration and discovery of cluster nodes through the Kubernetes API |
-| `metrics` | BY DEFAULT | Enable collection of metrics in Prometheus format on the admin API |
+To produce a build with a given set of features, invoke the `cargo build` command
+as follows:
+
+```bash
+# This will build the default feature set plus feature1, feature2 and feature3
+cargo build --release --features feature1,feature2,feature3
+# This will build ONLY feature1, feature2 and feature3
+cargo build --release --no-default-features \
+            --features feature1,feature2,feature3
+```
+
+The following feature flags are available in v0.8.0:
+
+| Feature flag | Enabled | Description |
+| ------------ | ------- | ----------- |
+| `bundled-libs` | *by default* | Use bundled version of sqlite3, zstd, lmdb and libsodium |
+| `system-libs` | optional | Use system version of sqlite3, zstd, lmdb and libsodium<br>if available (exclusive with `bundled-libs`, build using<br>`cargo build --no-default-features --features system-libs`) |
+| `k2v` | optional | Enable the experimental K2V API (if used, all nodes on your<br>Garage cluster must have it enabled as well) |
+| `kubernetes-discovery` | optional | Enable automatic registration and discovery<br>of cluster nodes through the Kubernetes API |
+| `metrics` | *by default* | Enable collection of metrics in Prometheus format on the admin API |
 | `telemetry-otlp` | optional | Enable collection of execution traces using OpenTelemetry |
-| `sled` | BY DEFAULT | Enable using Sled to store Garage's metadata |
+| `sled` | *by default* | Enable using Sled to store Garage's metadata |
 | `lmdb` | optional | Enable using LMDB to store Garage's metadata |
 | `sqlite` | optional | Enable using Sqlite3 to store Garage's metadata |
diff --git a/doc/book/reference-manual/features.md b/doc/book/reference-manual/features.md
index 23750800..d2d28946 100644
--- a/doc/book/reference-manual/features.md
+++ b/doc/book/reference-manual/features.md
@@ -26,6 +26,11 @@ a storage plan that best exploits the available storage capacity while satisfyin
 To learn more about geo-distributed Garage clusters,
 read our documentation on [setting up a real-world deployment](@/documentation/cookbook/real-world.md).
 
+### Standalone/self-contained
+
+Garage is extremely simple to deploy, and does not depend on any external service to run.
+This makes setting up and administering storage clusters, we hope, as easy as it could be.
+
 ### Flexible topology
 
 A Garage cluster can very easily evolve over time, as storage nodes are added or removed.
@@ -42,11 +47,11 @@ of going through a central bottleneck (the leader node).
 As a consequence, requests can be handled much faster, even in cases where latency
 between cluster nodes is important (see our [benchmarks](@/documentation/design/benchmarks/index.md) for data on this).
 This is particularly usefull when nodes are far from one another and talk to one other through standard Internet connections.
- 
+
 ### Several replication modes
 
 Garage supports a variety of replication modes, with 1 copy, 2 copies or 3 copies of your data,
-and with various levels of consistency. 
+and with various levels of consistency, in order to adapt to a variety of usage scenarios.
 Read our reference page on [supported replication modes](@/documentation/reference-manual/configuration.md#replication-mode)
 to select the replication mode best suited to your use case (hint: in most cases, `replication_mode = "3"` is what you want).
 
@@ -54,32 +59,67 @@ to select the replication mode best suited to your use case (hint: in most cases
 
 A storage bucket can easily be configured to be served directly by Garage as a static web site.
 Domain names for multiple websites directly map to bucket names, making it easy to build
-a platform for your user's to autonomously build and host their websites over Garage.
+a platform for your users to autonomously build and host their websites over Garage.
 Surprisingly, none of the other alternative S3 implementations we surveyed (such as Minio
 or CEPH) support publishing static websites from S3 buckets, a feature that is however
 directly inherited from S3 on AWS.
+Read more on our [dedicated documentation page](@/documentation/cookbook/exposing-websites.md).
 
 ### Bucket names as aliases
 
- - the same bucket may have multiple names (useful when exposing websites for example)
+In Garage, a bucket may have several names, known as aliases.
+Aliases can easily be added and removed on demand:
+this allows to easily rename buckets if needed
+without having to copy all of their content, something that cannot be done on AWS.
+For buckets served as static websites, having multiple aliases for a bucket can allow
+exposing the same content under different domain names.
+
+Garage also supports bucket aliases which are local to a single user:
+this allows different users to have different buckets with the same name, thus avoiding naming collisions.
+This can be helpfull for instance if you want to write an application that creates per-user buckets with always the same name.
+
+This feature is totally invisible to S3 clients and does not break compatibility with AWS.
+
+### Cluster administration API
+
+Garage provides a fully-fledged REST API to administer your cluster programatically.
+Functionnality included in the admin API include: setting up and monitoring
+cluster nodes, managing access credentials, and managing storage buckets and bucket aliases.
+A full reference of the administration API is available [here](@/documentation/reference-manual/admin-api.md).
+
+### Metrics and traces
 
- - bucket renaming is possible
+Garage makes some internal metrics available in the Prometheus data format,
+which allows you to build interactive dashboards to visualize the load and internal state of your storage cluster.
 
- - Scoped buckets: 2 users can have a different bucket with the same name -> avoid collision. Helpful if you want to write an application that creates per-user bucket always with the same name.
+For developpers and performance-savvy administrators,
+Garage also supports exporting traces of what it does internally in OpenTelemetry format.
+This allows to monitor the time spent at various steps of the processing of requests,
+in order to detect potential performance bottlenecks.
 
-### Standalone/self contained
+### Kubernetes and Nomad integrations
 
- 
-### Integration with Kubernetes and Nomad
+Garage can automatically discover other nodes in the cluster thanks to integration
+with orchestrators such as Kubernetes and Nomad (when used with Consul).
+This eases the configuration of your cluster as it removes one step where nodes need
+to be manually connected to one another.
 
-Many node discovery methods: Kubernetes integration, Nomad integration through Consul
- 
 ### Support for changing IP addresses
 
-(as long as all nodes don't change their IP at the same time)
+As long as all of your nodes don't thange their IP address at the same time,
+Garage should be able to tolerate nodes with changing/dynamic IP addresses,
+as nodes will regularly exchange the IP addresses of their peers and try to
+reconnect using newer addresses when existing connections are broken.
 
-### Cluster administration API
+### K2V API (experimental)
 
-### Metrics and traces
- 
-### (experimental) K2V API
+As part of an ongoing research project, Garage can expose an experimental key/value storage API called K2V.
+K2V is made for the storage and retrieval of many small key/value pairs that need to be processed in bulk.
+This completes the S3 API with an alternative that can be used to easily store and access metadata
+related to objects stored in an S3 bucket.
+
+In the context of our research project, [Aérogramme](https://aerogramme.deuxfleurs.fr),
+K2V is used to provide metadata and log storage for operations on encrypted e-mail storage.
+
+Learn more on the specification of K2V [here](https://git.deuxfleurs.fr/Deuxfleurs/garage/src/branch/k2v/doc/drafts/k2v-spec.md)
+and on how to enable it in Garage [here](@/documentation/reference-manual/k2v.md).