ScyllaDB is a high-performance NoSQL database system, fully compatible with Apache Cassandra. ScyllaDB is released under the GNU Affero General Public License version 3 and the Apache License, ScyllaDB is free and open-source software.
$ docker run --name some-scylla --hostname some-scylla -d scylladb/scylla$ docker exec -it some-scylla nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 172.17.0.2 125.51 KB 256 100.0% c9155121-786d-44f8-8667-a8b915b95665 rack1$ docker exec -it some-scylla cqlsh
Connected to Test Cluster at 172.17.0.2:9042.
[cqlsh 5.0.1 | Cassandra 2.1.8 | CQL spec 3.2.1 | Native protocol v3]
Use HELP for help.
cqlsh>$ docker run --name some-scylla2 --hostname some-scylla2 -d scylladb/scylla --seeds="$(docker inspect --format='{{ .NetworkSettings.IPAddress }}' some-scylla)"First, create a docker-compose.yml file with the following contents:
version: '3'
services:
some-scylla:
image: scylladb/scylla
container_name: some-scylla
some-scylla2:
image: scylladb/scylla
container_name: some-scylla2
command: --seeds=some-scylla
some-scylla3:
image: scylladb/scylla
container_name: some-scylla3
command: --seeds=some-scyllaThen, launch the 3-node cluster as follows:
docker-compose up -d
$ docker logs some-scylla | tail
INFO 2016-08-04 06:57:40,836 [shard 5] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,836 [shard 3] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,836 [shard 1] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,836 [shard 2] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,836 [shard 4] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,836 [shard 7] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,837 [shard 6] database - Setting compaction strategy of system_traces.events to SizeTieredCompactionStrategy
INFO 2016-08-04 06:57:40,839 [shard 0] database - Schema version changed to fea14d93-9c5a-34f5-9d0e-2e49dcfa747e
INFO 2016-08-04 06:57:40,839 [shard 0] storage_service - Starting listening for CQL clients on 172.17.0.2:9042...
INFO 2016-08-04 06:57:40,840 [shard 0] storage_service - Thrift server listening on 172.17.0.2:9160 ...You can use Docker volumes to improve performance of Scylla.
Create a Scylla data directory /var/lib/scylla on the host, which is used by Scylla container to store all data:
$ sudo mkdir -p /var/lib/scylla/data /var/lib/scylla/commitlog /var/lib/scylla/hints /var/lib/scylla/view_hintsLaunch Scylla using Docker's --volume command line option to mount the created host directory as a data volume in the container and disable Scylla's developer mode to run I/O tuning before starting up the Scylla node.
$ docker run --name some-scylla --volume /var/lib/scylla:/var/lib/scylla -d scylladb/scylla --developer-mode=0The Scylla docker image defaults to running on overprovisioned mode and won't apply any CPU pinning optimizations, which it normally does in non-containerized environments.
For better performance, it is recommended to configure resource limits for your Docker container using the --smp, --memory, and --cpuset command line options, as well as
disabling the overprovisioned flag as documented in the section "Command-line options".
The Docker image uses supervisord to manage Scylla processes. You can restart Scylla in a Docker container using
docker exec -it some-scylla supervisorctl restart scylla
The Scylla image supports many command line options that are passed to the docker run command.
The -seeds command line option configures Scylla's seed nodes.
If no --seeds option is specified, Scylla uses its own IP address as the seed.
For example, to configure Scylla to run with two seed nodes 192.168.0.100 and 192.168.0.200.
$ docker run --name some-scylla -d scylladb/scylla --seeds 192.168.0.100,192.168.0.200The --listen-address command line option configures the IP address the Scylla instance listens on for connections from other Scylla nodes.
For example, to configure Scylla to use listen address 10.0.0.5:
$ docker run --name some-scylla -d scylladb/scylla --listen-address 10.0.0.5Since: 1.4
The --alternator-address command line option configures the Alternator API listen address. The default value is the same as --listen-address.
Since: 3.2
The --alternator-port command line option configures the Alternator API listen port. The Alternator API is disabled by default. You need to specify the port to enable it.
For example, to configure Scylla to listen to Alternator API at port 8000:
$ docker run --name some-scylla -d scylladb/scylla --alternator-port 8000Since: 3.2
The --broadcast-address command line option configures the IP address the Scylla instance tells other Scylla nodes in the cluster to connect to.
For example, to configure Scylla to use broadcast address 10.0.0.5:
$ docker run --name some-scylla -d scylladb/scylla --broadcast-address 10.0.0.5The --broadcast-rpc-address command line option configures the IP address the Scylla instance tells clients to connect to.
For example, to configure Scylla to use broadcast RPC address 10.0.0.5:
$ docker run --name some-scylla -d scylladb/scylla --broadcast-rpc-address 10.0.0.5The --smp command line option restricts Scylla to COUNT number of CPUs.
The option does not, however, mandate a specific placement of CPUs.
See the --cpuset command line option if you need Scylla to run on specific CPUs.
For example, to restrict Scylla to 2 CPUs:
$ docker run --name some-scylla -d scylladb/scylla --smp 2The --memory command line option restricts Scylla to use up to AMOUNT of memory.
The AMOUNT value supports both M unit for megabytes and G unit for gigabytes.
For example, to restrict Scylla to 4 GB of memory:
$ docker run --name some-scylla -d scylladb/scylla --memory 4GThe --reserve-memory command line option configures Scylla to reserve the AMOUNT of memory to the OS.
The AMOUNT value supports both M unit for megabytes and G unit for gigabytes.
For example, to reserve 4 GB of memory to the OS:
$ docker run --name some-scylla -d scylladb/scylla --reserve-memory 4GThe --overprovisioned command line option enables or disables optimizations for running Scylla in an overprovisioned environment.
If no --overprovisioned option is specified, Scylla defaults to running with optimizations enabled. If --overprovisioned is
not specified and is left at its default, specifying --cpuset will automatically disable --overprovisioned
For example, to enable optimizations for running in an statically partitioned environment:
$ docker run --name some-scylla -d scylladb/scylla --overprovisioned 0The --cpuset command line option restricts Scylla to run on only on CPUs specified by CPUSET.
The CPUSET value is either a single CPU (e.g. --cpuset 1), a range (e.g. --cpuset 2-3), or a list (e.g. --cpuset 1,2,5), or a combination of the last two options (e.g. --cpuset 1-2,5).
For example, to restrict Scylla to run on physical CPUs 0 to 2 and 4:
$ docker run --name some-scylla -d scylladb/scylla --cpuset 0-2,4The --developer-mode command line option enables Scylla's developer mode, which relaxes checks for things like XFS and enables Scylla to run on unsupported configurations (which usually results in suboptimal performance).
If no --developer-mode command line option is defined, Scylla defaults to running with developer mode enabled.
It is highly recommended to disable developer mode for production deployments to ensure Scylla is able to run with maximum performance.
For example, to disable developer mode:
$ docker run --name some-scylla -d scylladb/scylla --developer-mode 0The --experimental command line option enables Scylla's experimental mode
If no --experimental command line option is defined, Scylla defaults to running with experimental mode disabled.
It is highly recommended to disable experimental mode for production deployments.
For example, to enable experimental mode:
$ docker run --name some-scylla -d scylladb/scylla --experimental 1Since: 2.0
The --disable-version-check disable the version validation check.
Since: 2.2
The --authenticator command lines option allows to provide the authenticator class Scylla will use. By default Scylla uses the AllowAllAuthenticator which performs no credentials checks. The second option is using the PasswordAuthenticator parameter, which relies on username/password pairs to authenticate users.
Since: 2.3
The --authorizer command lines option allows to provide the authorizer class Scylla will use. By default Scylla uses the AllowAllAuthorizer which allows any action to any user. The second option is using the CassandraAuthorizer parameter, which stores permissions in system_auth.permissions table.
Since: 2.3
For bug reports, please use Scylla's issue tracker on GitHub. Please read the How to report a Scylla problem page before you report bugs.
For general help, see Scylla's documentation. For questions and comments, use Scylla's mailing lists.
Want to scratch your own itch and contribute a patch. We are eager to review and merge your code. Please consult the Contributing on Scylla page