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rpk redpanda tune

rpk redpanda tune, also referred to as the autotuner, identifies the hardware configuration on your machine and optimizes the Linux kernel to give you the best performance for running Redpanda.

Available tuners:

  • all

  • disk_irq

  • disk_scheduler

  • disk_nomerges

  • disk_write_cache

  • fstrim

  • net

  • aio_events

  • swappiness

  • ballast_file

  • cpu

  • clocksource

  • transparent_hugepages

  • coredump

To learn more about a tuner, run rpk redpanda tune help |tuner name|.

You should run the autotuner as part of the production deployment workflow. Redpanda recommends you first follow a guide for production deployment:

While you follow the guides, consult this reference for details about the autotuner.

Usage

rpk redpanda tune <list of elements to tune> [command] [flags]

  • When running rpk redpanda tune, make sure that your current Linux user has root privileges. The autotuner requires privileged access to the Linux kernel settings.

  • To run rpk redpanda tune all on a Redpanda broker automatically after broker or host restarts, configure the service redpanda-tuner, which runs rpk redpanda tune all, to run at boot-up:

    • For RHEL, after installing the rpm package, run systemctl to both start and enable the redpanda-tuner service:

      sudo systemctl start redpanda-tuner
sudo systemctl enable redpanda-tuner

    • For Ubuntu, after installing the apt package, run systemctl to start the redpanda-tuner service (which is already enabled):

      sudo systemctl start redpanda-tuner

Flags

Value Type Description

--cpu-set

string

Set of CPUs for tuners to use in cpuset(7) format; if not specified, tuners will use all available CPUs (default "all").

-r, --dirs

strings

List of data directories or places to store data (e.g. /var/vectorized/redpanda/); usually your XFS filesystem on an NVMe SSD device.

-d, --disks

strings

Lists of devices to tune f.e. 'sda1'.

-h, --help

-

Help for tune.

-m, --mode

string

Operation Mode: one of: [sq, sq_split, mq].

-n, --nic

strings

Network Interface Controllers to tune.

--output-script

string

Generate a tuning file that can later be used to tune the system.

--reboot-allowed

-

Allow tuners to tune boot parameters and request system reboot.

--timeout

duration

The maximum time to wait for the tune processes to complete (e.g. 300ms, 1.5s, 2h45m) (default 10s).

--config

string

Redpanda or rpk config file; default search paths are ~/.config/rpk/rpk.yaml, $PWD, and /etc/redpanda/redpanda.yaml.

-X, --config-opt

stringArray

Override rpk configuration settings; '-X help' for detail or '-X list' for terser detail.

--profile

string

rpk profile to use.

-v, --verbose

-

Enable verbose logging.

Examples

This section provides examples of using the autotuner.

  • To enable a predetermined set of tuners for production, run the rpk redpanda mode prod command. This command modifies settings in the redpanda.yaml configuration file.

  • To list the available tuners and to see whether they’re enabled or supported (and a reason for if they’re unsupported), run the rpk redpanda tune list command.

  • To enable or disable a tuner, run the rpk redpanda config set, as the tuner flags are configurable node properties.

    • Each tuner has a YAML key flag for enabling/disabling itself in redpanda.yaml. Most are formed by prepending rpk.tune_ to the name of the tuner listed by rpk redpanda tune list. See the Tuners reference for the exact key for a tuner. For an example of enabling a tuner, the key for the aio_events tuner is rpk.tune_aio_events, and it can be enabled with the following command:

      rpk redpanda config set rpk.tune_aio_events true

  • To run all available tuners, use the rpk redpanda tune command for all:

    rpk redpanda tune all

  • To run a specific tuner, use the rpk redpanda tune command for the tuner:

    rpk redpanda tune <tuner>

  • To learn more about a tuner, use the rpk redpanda tune help command for the tuner:

    rpk redpanda tune help <tuner>

    See also the Tuners reference for descriptions about each tuner.