Docker Hub Image¶

Make a cluster with Docker Compose¶

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-scylla

Then, launch the 3-node cluster as follows:

docker-compose up -d

--seeds SEEDS¶

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 192.168.0.100,192.168.0.200

--listen-address ADDR¶

The --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 10.0.0.5

Since: 1.4

--alternator-address ADDR¶

The --alternator-address command line option configures the Alternator API listen address. The default value is the same as --listen-address.

Since: 3.2

--alternator-port PORT¶

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 8000

Since: 3.2

--alternator-https-port PORT¶

The --alternator-https-port option is similar to --alternator-port, just enables an encrypted (HTTPS) port. Either the --alternator-https-port or --alternator-http-port, or both, can be used to enable Alternator.

Note that the --alternator-https-port option also requires that files /etc/scylla/scylla.crt and /etc/scylla/scylla.key be inserted into the image. These files contain an SSL certificate and key, respectively.

Since: 4.2

--alternator-write-isolation policy¶

The --alternator-write-isolation command line option chooses between four allowed write isolation policies described in docs/alternator/alternator.md. This option must be specified if Alternator is enabled - it does not have a default.

Since: 4.1

--broadcast-address ADDR¶

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 10.0.0.5

--broadcast-rpc-address ADDR¶

The --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 10.0.0.5

--smp COUNT¶

The --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 2

--memory AMOUNT¶

The --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 4G

--reserve-memory AMOUNT¶

The --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 4G

--overprovisioned ENABLE¶

The --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 0

--io-setup ENABLE¶

The --io-setup command line option specifies if the scylla_io_setup script is run when the container is started for the first time. This is useful if users want to specify I/O settings themselves in environments such as Kubernetes, where running iotune is problematic. The default of --io-setup is 1, which means I/O setup is run.

For example, to skip running I/O setup:

$ docker run --name some-scylla -d scylladb/scylla --io-setup 0

Since: 4.3

--cpuset CPUSET¶

The --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 0-2,4

--developer-mode ENABLE¶

The --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 0

--experimental ENABLE¶

The --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 1

Since: 2.0

--disable-version-check¶

The --disable-version-check disable the version validation check.

Since: 2.2

--authenticator AUTHENTICATOR¶

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

--authorizer AUTHORIZER¶

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

SCYLLA_JMX_PORT¶

Scylla JMX listening port.

Default value:

SCYLLA_JMX_PORT="-jp 7199"

SCYLLA_API_PORT¶

Scylla API port for JMX to connect to.

Default value:

SCYLLA_API_PORT="-p 10000"

SCYLLA_API_ADDR¶

Scylla API address for JMX to connect to.

Default value:

SCYLLA_API_ADDR="-a localhost"

SCYLLA_JMX_ADDR¶

JMX address to bind on.

Default value:

SCYLLA_JMX_ADDR="-ja localhost"

For example, it is possible to make JMX available to the outer world by changing its bind address to 0.0.0.0:

docker run -d -e "SCYLLA_JMX_ADDR=-ja 0.0.0.0" -e SCYLLA_JMX_REMOTE=-r --publish 7199:7199 scylladb/scylla

cassandra-stress requires direct access to the JMX.

SCYLLA_JMX_FILE¶

A JMX service configuration file path.

Example value:

SCYLLA_JMX_FILE="-cf /etc/scylla.d/scylla-user.cfg"

SCYLLA_JMX_LOCAL¶

The location of the JMX executable.

Example value:

SCYLLA_JMX_LOCAL="-l /opt/scylladb/jmx

SCYLLA_JMX_REMOTE¶

Allow JMX to run remotely.

Example value:

SCYLLA_JMX_REMOTE="-r"

SCYLLA_JMX_DEBUG¶

Enable debugger.

Example value:

SCYLLA_JMX_DEBUG="-d"