navsection: installguide
title: Install Keepstore servers
...
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
-We are going to install two Keepstore servers. By convention, we use the following hostname pattern:
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
+
+Keepstore provides access to underlying storage for reading and writing content-addressed blocks, with enforcement of Arvados permissions. Keepstore supports a variety of cloud object storage and POSIX filesystems for its backing store.
+
+h2. Plan your storage layout
+
+In the steps below, you will configure a number of backend storage volumes (like local filesystems and S3 buckets) and specify which keepstore servers have read-only and read-write access to which volumes.
+
+It is possible to configure arbitrary server/volume layouts. However, in order to provide good performance and efficient use of storage resources, we strongly recommend using one of the following layouts:
+
+# Each volume is writable by exactly one server, and optionally readable by one or more other servers. The total capacity of all writable volumes is the same for each server.
+# Each volume is writable by all servers. Each volume has enough built-in redundancy to satisfy your requirements, i.e., you do not need Arvados to mirror data across multiple volumes.
+
+We recommend starting off with two Keepstore servers. Exact server specifications will be site and workload specific, but in general keepstore will be I/O bound and should be set up to maximize aggregate bandwidth with compute nodes. To increase capacity (either space or throughput) it is straightforward to add additional servers, or (in cloud environments) to increase the machine size of the existing servers.
+
+By convention, we use the following hostname pattern:
<div class="offset1">
table(table table-bordered table-condensed).
|_Hostname_|
-|keep0.@uuid_prefix@.your.domain|
-|keep1.@uuid_prefix@.your.domain|
+|keep0.@ClusterID@.example.com|
+|keep1.@ClusterID@.example.com|
</div>
-Because the Keepstore servers are not directly accessible from the internet, these hostnames only need to resolve on the local network.
-
-h2. Install Keepstore
+Keepstore servers should not be directly accessible from the Internet (they are accessed via "keepproxy":install-keepproxy.html), so the hostnames only need to resolve on the private network.
-On Debian-based systems:
+h2. Update cluster config
-<notextile>
-<pre><code>~$ <span class="userinput">sudo apt-get install keepstore</span>
-</code></pre>
-</notextile>
+h3. List services
-On Red Hat-based systems:
+Add each keepstore server to @/etc/arvados/config.yml@ .
<notextile>
-<pre><code>~$ <span class="userinput">sudo yum install keepstore</span>
+<pre><code> Services:
+ Keepstore:
+ # No ExternalURL because they are only accessed by the internal subnet.
+ InternalURLs:
+ "http://<span class="userinput">keep0.ClusterID.example.com</span>:25107/": {}
+ "http://<span class="userinput">keep1.ClusterID.example.com</span>:25107/": {}
+ # and so forth
</code></pre>
</notextile>
-Verify that Keepstore is functional:
+h3. Configure storage volumes
-<notextile>
-<pre><code>~$ <span class="userinput">keepstore -h</span>
-2016/07/01 14:06:21 keepstore starting, pid 32339
-Usage of ./keepstore:
- -azure-max-get-bytes int
- Maximum bytes to request in a single GET request. If smaller than 67108864, use multiple concurrent range requests to retrieve a block. (default 67108864)
- -azure-storage-account-key-file string
- File containing the account key used for subsequent --azure-storage-container-volume arguments.
- -azure-storage-account-name string
- Azure storage account name used for subsequent --azure-storage-container-volume arguments.
- -azure-storage-container-volume value
- Use the given container as a storage volume. Can be given multiple times. (default [])
- -azure-storage-replication int
- Replication level to report to clients when data is stored in an Azure container. (default 3)
- -blob-signature-ttl int
- Lifetime of blob permission signatures in seconds. Modifying the ttl will invalidate all existing signatures. See services/api/config/application.default.yml. (default 1209600)
- -blob-signing-key-file string
- File containing the secret key for generating and verifying blob permission signatures.
- -data-manager-token-file string
- File with the API token used by the Data Manager. All DELETE requests or GET /index requests must carry this token.
- -enforce-permissions
- Enforce permission signatures on requests.
- -listen string
- Listening address, in the form "host:port". e.g., 10.0.1.24:8000. Omit the host part to listen on all interfaces. (default ":25107")
- -max-buffers int
- Maximum RAM to use for data buffers, given in multiples of block size (64 MiB). When this limit is reached, HTTP requests requiring buffers (like GET and PUT) will wait for buffer space to be released. (default 128)
- -max-requests int
- Maximum concurrent requests. When this limit is reached, new requests will receive 503 responses. Note: this limit does not include idle connections from clients using HTTP keepalive, so it does not strictly limit the number of concurrent connections. (default 2 * max-buffers)
- -never-delete
- If true, nothing will be deleted. Warning: the relevant features in keepstore and data manager have not been extensively tested. You should leave this option alone unless you can afford to lose data. (default true)
- -permission-key-file string
- Synonym for -blob-signing-key-file.
- -permission-ttl int
- Synonym for -blob-signature-ttl.
- -pid fuser -k pidfile
- Path to write pid file during startup. This file is kept open and locked with LOCK_EX until keepstore exits, so fuser -k pidfile is one way to shut down. Exit immediately if there is an error opening, locking, or writing the pid file.
- -readonly
- Do not write, delete, or touch anything on the following volumes.
- -s3-access-key-file string
- File containing the access key used for subsequent -s3-bucket-volume arguments.
- -s3-bucket-volume value
- Use the given bucket as a storage volume. Can be given multiple times. (default [])
- -s3-endpoint string
- Endpoint URL used for subsequent -s3-bucket-volume arguments. If blank, use the AWS endpoint corresponding to the -s3-region argument. For Google Storage, use "https://storage.googleapis.com".
- -s3-region string
- AWS region used for subsequent -s3-bucket-volume arguments. Allowed values are ["ap-southeast-1" "eu-west-1" "us-gov-west-1" "sa-east-1" "cn-north-1" "ap-northeast-1" "ap-southeast-2" "eu-central-1" "us-east-1" "us-west-1" "us-west-2"].
- -s3-replication int
- Replication level reported to clients for subsequent -s3-bucket-volume arguments. (default 2)
- -s3-secret-key-file string
- File containing the secret key used for subsequent -s3-bucket-volume arguments.
- -s3-unsafe-delete
- EXPERIMENTAL. Enable deletion (garbage collection), even though there are known race conditions that can cause data loss.
- -serialize
- Serialize read and write operations on the following volumes.
- -trash-check-interval duration
- Time duration at which the emptyTrash goroutine will check and delete expired trashed blocks. Default is one day. (default 24h0m0s)
- -trash-lifetime duration
- Time duration after a block is trashed during which it can be recovered using an /untrash request
- -volume value
- Local storage directory. Can be given more than once to add multiple directories. If none are supplied, the default is to use all directories named "keep" that exist in the top level directory of a mount point at startup time. Can be a comma-separated list, but this is deprecated: use multiple -volume arguments instead. (default [])
- -volumes value
- Deprecated synonym for -volume. (default [])
-</code></pre>
-</notextile>
+Available storage volume types include POSIX filesystems and cloud object storage.
-h3. Prepare storage volumes
+* To use a POSIX filesystem, including both local filesystems (ext4, xfs) and network file system such as GPFS or Lustre, follow the setup instructions on "Filesystem storage":configure-fs-storage.html
+* If you are using S3-compatible object storage (including Amazon S3, Google Cloud Storage, and Ceph RADOS), follow the setup instructions on "S3 Object Storage":configure-s3-object-storage.html
+* If you are using Azure Blob Storage, follow the setup instructions on "Azure Blob Storage":configure-azure-blob-storage.html
-{% include 'notebox_begin' %}
-This section uses a local filesystem as a backing store. If you are using Azure Storage, follow the setup instructions on the "Azure Blob Storage":configure-azure-blob-storage.html page instead.
-{% include 'notebox_end' %}
+h2. Install keepstore package
-There are two ways to specify a set of local directories where keepstore should store its data files.
-# Implicitly, by creating a directory called @keep@ at the top level of each filesystem you intend to use, and omitting @-volume@ arguments.
-# Explicitly, by providing a @-volume@ argument for each directory.
+On each host that will run keepstore, install the @keepstore@ package.
-For example, if there are filesystems mounted at @/mnt@ and @/mnt2@:
+h3. Centos 7
<notextile>
-<pre><code>~$ <span class="userinput">mkdir /mnt/keep /mnt2/keep</span>
-~$ <span class="userinput">keepstore</span>
-2015/05/08 13:44:26 keepstore starting, pid 2765
-2015/05/08 13:44:26 Using volume [UnixVolume /mnt/keep] (writable=true)
-2015/05/08 13:44:26 Using volume [UnixVolume /mnt2/keep] (writable=true)
-2015/05/08 13:44:26 listening at :25107
+<pre><code># <span class="userinput">yum install keepstore</span>
</code></pre>
</notextile>
-Equivalently:
+h3. Debian and Ubuntu
<notextile>
-<pre><code>~$ <span class="userinput">mkdir /mnt/keep /mnt2/keep</span>
-~$ <span class="userinput">keepstore -volume=/mnt/keep -volume=/mnt2/keep</span>
-2015/05/08 13:44:26 keepstore starting, pid 2765
-2015/05/08 13:44:26 Using volume [UnixVolume /mnt/keep] (writable=true)
-2015/05/08 13:44:26 Using volume [UnixVolume /mnt2/keep] (writable=true)
-2015/05/08 13:44:26 listening at :25107
+<pre><code># <span class="userinput">apt-get install keepstore</span>
</code></pre>
</notextile>
-h3. Run keepstore as a supervised service
+h2. Restart the API server and controller
-Install runit to supervise the keepstore daemon. {% include 'install_runit' %}
-
-Install this script as the run script for the keepstore service, modifying it as directed below.
+After adding all of your keepstore servers to the Services section, make sure the cluster config file is up to date on the API server host, and restart the API server and controller processes to ensure the changes are applied.
<notextile>
-<pre><code>#!/bin/sh
-
-exec 2>&1
-exec GOGC=10 GOMAXPROCS=<span class="userinput">4</span> keepstore \
- -enforce-permissions=true \
- -blob-signing-key-file=<span class="userinput">/etc/keepstore/blob-signing.key</span> \
- -max-buffers=<span class="userinput">100</span> \
- -serialize=true \
- -never-delete=false \
- -volume=<span class="userinput">/mnt/keep</span> \
- -volume=<span class="userinput">/mnt2/keep</span>
+<pre><code># <span class="userinput">systemctl restart nginx arvados-controller</span>
</code></pre>
</notextile>
-The @GOMAXPROCS@ environment variable determines the maximum number of concurrent threads, and should normally be set to the number of CPU cores present.
+h2(#testing). Testing keep
-The @-max-buffers@ argument limits keepstore's memory usage. It should be set such that @max-buffers * 64MiB + 10%@ fits comfortably in memory. For example, @-max-buffers=100@ is suitable for a host with 8 GiB RAM.
+Install the "Python SDK":{{site.baseurl}}/sdk/python/sdk-python.html
-If you want access control on your Keepstore server(s), you must specify the @-enforce-permissions@ flag and provide a signing key. The @-blob-signing-key-file@ argument should be a file containing a long random alphanumeric string with no internal line breaks (it is also possible to use a socket or FIFO: keepstore reads it only once, at startup). This key must be the same as the @blob_signing_key@ configured in the "API server's":install-api-server.html configuration file, @/etc/arvados/api/application.yml@.
+@ARVADOS_API_HOST@ and @ARVADOS_API_TOKEN@ must be set in the environment.
-The @-serialize=true@ (default: @false@) argument limits keepstore to one reader/writer process per storage partition. This avoids thrashing by allowing the storage device underneath the storage partition to do read/write operations sequentially. Enabling @-serialize@ can improve Keepstore performance if the storage partitions map 1:1 to physical disks that are dedicated to Keepstore, particularly so for mechanical disks. In some cloud environments, enabling @-serialize@ has also also proven to be beneficial for performance, but YMMV. If your storage partition(s) are backed by network or RAID storage that can handle many simultaneous reader/writer processes without thrashing, you probably do not want to set @-serialize@.
+You should now be able to use @arv-put@ to upload collections and @arv-get@ to fetch collections:
-h3. Set up additional servers
+<pre>
+$ echo "hello world!" > hello.txt
-Repeat the above sections to prepare volumes and bring up supervised services on each Keepstore server you are setting up.
+$ arv-put --portable-data-hash hello.txt
+2018-07-12 13:35:25 arvados.arv_put[28702] INFO: Creating new cache file at /home/example/.cache/arvados/arv-put/1571ec0adb397c6a18d5c74cc95b3a2a
+0M / 0M 100.0% 2018-07-12 13:35:27 arvados.arv_put[28702] INFO:
-h3. Tell the API server about the Keepstore servers
+2018-07-12 13:35:27 arvados.arv_put[28702] INFO: Collection saved as 'Saved at 2018-07-12 17:35:25 UTC by example@example'
+59389a8f9ee9d399be35462a0f92541c+53
-The API server needs to be informed about the presence of your Keepstore servers. For each of the Keepstore servers you have created, please execute the following commands on your <strong>shell server</strong>.
+$ arv-get 59389a8f9ee9d399be35462a0f92541c+53/hello.txt
+hello world!
+</pre>
-Make sure to update the @service_host@ value to match each of your Keepstore servers.
+h3. Note on storage management
-<notextile>
-<pre><code>~$ <span class="userinput">prefix=`arv --format=uuid user current | cut -d- -f1`</span>
-~$ <span class="userinput">echo "Site prefix is '$prefix'"</span>
-~$ <span class="userinput">read -rd $'\000' keepservice <<EOF; arv keep_service create --keep-service "$keepservice"</span>
-<span class="userinput">{
- "service_host":"<strong>keep0.$prefix.your.domain</strong>",
- "service_port":25107,
- "service_ssl_flag":false,
- "service_type":"disk"
-}
-EOF</span>
-</code></pre></notextile>
+On its own, a keepstore server never deletes data. Instead, the keep-balance service determines which blocks are candidates for deletion and instructs the keepstore to move those blocks to the trash. Please see the "Balancing Keep servers":{{site.baseurl}}/admin/keep-balance.html for more details.
projects / arvados.git / blobdiff