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diff --git a/content/documentation/reference_manual/configuration.md b/content/documentation/reference_manual/configuration.md new file mode 100644 index 0000000..9f88b23 --- /dev/null +++ b/content/documentation/reference_manual/configuration.md @@ -0,0 +1,237 @@ +# Garage configuration file format reference + +Here is an example `garage.toml` configuration file that illustrates all of the possible options: + +```toml +metadata_dir = "/var/lib/garage/meta" +data_dir = "/var/lib/garage/data" + +block_size = 1048576 + +replication_mode = "3" + +compression_level = 1 + +rpc_secret = "4425f5c26c5e11581d3223904324dcb5b5d5dfb14e5e7f35e38c595424f5f1e6" +rpc_bind_addr = "[::]:3901" +rpc_public_addr = "[fc00:1::1]:3901" + +bootstrap_peers = [ + "563e1ac825ee3323aa441e72c26d1030d6d4414aeb3dd25287c531e7fc2bc95d@[fc00:1::1]:3901", + "86f0f26ae4afbd59aaf9cfb059eefac844951efd5b8caeec0d53f4ed6c85f332[fc00:1::2]:3901", + "681456ab91350f92242e80a531a3ec9392cb7c974f72640112f90a600d7921a4@[fc00:B::1]:3901", + "212fd62eeaca72c122b45a7f4fa0f55e012aa5e24ac384a72a3016413fa724ff@[fc00:F::1]:3901", +] + +consul_host = "consul.service" +consul_service_name = "garage-daemon" + +sled_cache_capacity = 134217728 +sled_flush_every_ms = 2000 + +[s3_api] +api_bind_addr = "[::]:3900" +s3_region = "garage" +root_domain = ".s3.garage" + +[s3_web] +bind_addr = "[::]:3902" +root_domain = ".web.garage" +index = "index.html" +``` + +The following gives details about each available configuration option. + +## Available configuration options + +#### `metadata_dir` + +The directory in which Garage will store its metadata. This contains the node identifier, +the network configuration and the peer list, the list of buckets and keys as well +as the index of all objects, object version and object blocks. + +Store this folder on a fast SSD drive if possible to maximize Garage's performance. + +#### `data_dir` + +The directory in which Garage will store the data blocks of objects. +This folder can be placed on an HDD. The space available for `data_dir` +should be counted to determine a node's capacity +when [configuring it](../getting_started/05_cluster.md). + +#### `block_size` + +Garage splits stored objects in consecutive chunks of size `block_size` +(except the last one which might be smaller). The default size is 1MB and +should work in most cases. If you are interested in tuning this, feel free +to do so (and remember to report your findings to us!). If this value is +changed for a running Garage installation, only files newly uploaded will be +affected. Previously uploaded files will remain available. This however +means that chunks from existing files will not be deduplicated with chunks +from newly uploaded files, meaning you might use more storage space that is +optimally possible. + +#### `replication_mode` + +Garage supports the following replication modes: + +- `none` or `1`: data stored on Garage is stored on a single node. There is no redundancy, + and data will be unavailable as soon as one node fails or its network is disconnected. + Do not use this for anything else than test deployments. + +- `2`: data stored on Garage will be stored on two different nodes, if possible in different + zones. Garage tolerates one node failure before losing data. Data should be available + read-only when one node is down, but write operations will fail. + Use this only if you really have to. + +- `3`: data stored on Garage will be stored on three different nodes, if possible each in + a different zones. + Garage tolerates two node failure before losing data. Data should be available + read-only when two nodes are down, and writes should be possible if only a single node + is down. + +Note that in modes `2` and `3`, +if at least the same number of zones are available, an arbitrary number of failures in +any given zone is tolerated as copies of data will be spread over several zones. + +**Make sure `replication_mode` is the same in the configuration files of all nodes. +Never run a Garage cluster where that is not the case.** + +Changing the `replication_mode` of a cluster might work (make sure to shut down all nodes +and changing it everywhere at the time), but is not officially supported. + +### `compression_level` + +Zstd compression level to use for storing blocks. + +Values between `1` (faster compression) and `19` (smaller file) are standard compression +levels for zstd. From `20` to `22`, compression levels are referred as "ultra" and must be +used with extra care as it will use lot of memory. A value of `0` will let zstd choose a +default value (currently `3`). Finally, zstd has also compression designed to be faster +than default compression levels, they range from `-1` (smaller file) to `-99` (faster +compression). + +If you do not specify a `compression_level` entry, garage will set it to `1` for you. With +this parameters, zstd consumes low amount of cpu and should work faster than line speed in +most situations, while saving some space and intra-cluster +bandwidth. + +If you want to totally deactivate zstd in garage, you can pass the special value `'none'`. No +zstd related code will be called, your chunks will be stored on disk without any processing. + +Compression is done synchronously, setting a value too high will add latency to write queries. + +This value can be different between nodes, compression is done by the node which receive the +API call. + +#### `rpc_secret` + +Garage uses a secret key that is shared between all nodes of the cluster +in order to identify these nodes and allow them to communicate together. +This key should be specified here in the form of a 32-byte hex-encoded +random string. Such a string can be generated with a command +such as `openssl rand -hex 32`. + +#### `rpc_bind_addr` + +The address and port on which to bind for inter-cluster communcations +(reffered to as RPC for remote procedure calls). +The port specified here should be the same one that other nodes will used to contact +the node, even in the case of a NAT: the NAT should be configured to forward the external +port number to the same internal port nubmer. This means that if you have several nodes running +behind a NAT, they should each use a different RPC port number. + +#### `rpc_public_addr` + +The address and port that other nodes need to use to contact this node for +RPC calls. **This parameter is optional but recommended.** In case you have +a NAT that binds the RPC port to a port that is different on your public IP, +this field might help making it work. + +#### `bootstrap_peers` + +A list of peer identifiers on which to contact other Garage peers of this cluster. +These peer identifiers have the following syntax: + +``` +<node public key>@<node public IP or hostname>:<port> +``` + +In the case where `rpc_public_addr` is correctly specified in the +configuration file, the full identifier of a node including IP and port can +be obtained by running `garage node id` and then included directly in the +`bootstrap_peers` list of other nodes. Otherwise, only the node's public +key will be returned by `garage node id` and you will have to add the IP +yourself. + +#### `consul_host` and `consul_service_name` + +Garage supports discovering other nodes of the cluster using Consul. +This works only when nodes are announced in Consul by an orchestrator such as Nomad, +as Garage is not able to announce itself. + +The `consul_host` parameter should be set to the hostname of the Consul server, +and `consul_service_name` should be set to the service name under which Garage's +RPC ports are announced. + +#### `sled_cache_capacity` + +This parameter can be used to tune the capacity of the cache used by +[sled](https://sled.rs), the database Garage uses internally to store metadata. +Tune this to fit the RAM you wish to make available to your Garage instance. +More cache means faster Garage, but the default value (128MB) should be plenty +for most use cases. + +#### `sled_flush_every_ms` + +This parameters can be used to tune the flushing interval of sled. +Increase this if sled is thrashing your SSD, at the risk of losing more data in case +of a power outage (though this should not matter much as data is replicated on other +nodes). The default value, 2000ms, should be appropriate for most use cases. + + +## The `[s3_api]` section + +#### `api_bind_addr` + +The IP and port on which to bind for accepting S3 API calls. +This endpoint does not suport TLS: a reverse proxy should be used to provide it. + +#### `s3_region` + +Garage will accept S3 API calls that are targetted to the S3 region defined here. +API calls targetted to other regions will fail with a AuthorizationHeaderMalformed error +message that redirects the client to the correct region. + +#### `root_domain` + +The optionnal suffix to access bucket using vhost-style in addition to path-style request. +Note path-style requests are always enabled, whether or not vhost-style is configured. +Configuring vhost-style S3 required a wildcard DNS entry, and possibly a wildcard TLS certificate, +but might be required by softwares not supporting path-style requests. + +If `root_domain` is `s3.garage.eu`, a bucket called `my-bucket` can be interacted with +using the hostname `my-bucket.s3.garage.eu`. + +## The `[s3_web]` section + +Garage allows to publish content of buckets as websites. This section configures the +behaviour of this module. + +#### `bind_addr` + +The IP and port on which to bind for accepting HTTP requests to buckets configured +for website access. +This endpoint does not suport TLS: a reverse proxy should be used to provide it. + +#### `root_domain` + +The optionnal suffix appended to bucket names for the corresponding HTTP Host. + +For instance, if `root_domain` is `web.garage.eu`, a bucket called `deuxfleurs.fr` +will be accessible either with hostname `deuxfleurs.fr.web.garage.eu` +or with hostname `deuxfleurs.fr`. + +#### `index` + +The name of the index file to return for requests ending with `/` (usually `index.html`). |