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Online Deployment Using YAML File - Red Hat Distribution

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Introduction

Installing SingleStore on bare metal, on virtual machines, or in the cloud can be done through the use of popular configuration management tools or through SingleStore’s management tools.

In this guide, you will deploy a SingleStore cluster onto physical or virtual machines and connect to the cluster using a SQL client.

A four-node cluster is the minimal recommended cluster size for showcasing SingleStore as a distributed database with high availability; however, you can use the procedures in this tutorial to scale out to additional nodes for increased performance over large data sets or to handle higher concurrency loads. To learn more about SingleStore’s design principles and topology concepts, see Distributed Architecture.

Note

There are no licensing costs for using up to four license units for the leaf nodes in your cluster. If you need a larger cluster with more/larger leaf nodes, please create an Enterprise License trial key.

Prerequisites

For this tutorial you will need:

  • One (for single-host cluster-in-a-box for development) or four physical or virtual machines (hosts) with the following:

    • Each SingleStore node requires at least four (4) x86_64 CPU cores and eight (8) GB of RAM per host

    • Eight (8) vCPU and 32 GB of RAM are recommended for leaf nodes to align with license unit calculations

    • Running a 64-bit version of RHEL/AlmaLinux 7 or later, or Debian 8 or later, with kernel 3.10 or later

    • Port 3306 open on all hosts for intra-cluster communication. Based on the deployment method, this default can be changed either from the command line or via cluster file.

    • Port 8080 open on the main deployment host for the cluster

    • A non-root user with sudo privileges available on all hosts in the cluster that be used to run SingleStore services and own the corresponding runtime state

  • SSH access to all hosts

  • A connection to the Internet to download required packages

If running this in a production environment, it is highly recommended that you follow our host configuration recommendations for optimal cluster performance.

Duplicate Hosts

As of SingleStore Toolbox 1.4.4, a check for duplicate hosts is performed before SingleStore is deployed, and will display a message similar to the following if more than one host has the same SSH host key:

✘ Host check failed.host 172.26.212.166 has the same ssh
host keys as 172.16.212.165, toolbox doesn't support
registering the same host twice

Confirm that all specified hosts are indeed different and aren’t using identical SSH host keys. Identical host keys can be present if you have instantiated your host instances from images (AMIs, snapshots, etc.) that contain existing host keys. When a host is cloned, the host key (typically stored in /etc/ssh/ssh_host_<cipher>_key) will also be cloned.

As each cloned host will have the same host key, an SSH client cannot verify that it is connecting to the intended host. The script that deploys SingleStore will interpret a duplicate host key as an attempt to deploy to the same host twice, and the deployment will fail.

The following steps demonstrate a potential remedy for the duplicate hosts message. Please note these steps may slightly differ depending on your Linux distribution and configuration.

sudo root
ls -al /etc/ssh/
rm /etc/ssh/<your-ssh-host-keys>
ssh-keygen -f /etc/ssh/<ssh-host-key-filename> -N '' -t rsa1
ssh-keygen -f /etc/ssh/<ssh-host-rsa-key-filename> -N '' -t rsa
ssh-keygen -f /etc/ssh/<ssh-host-dsa-key-filename> -N '' -t dsa

For more information about SSH host keys, including the equivalent steps for Ubuntu-based systems, refer to Avoid Duplicating SSH Host Keys.

As of SingleStore Toolbox 1.5.3, sdb-deploy setup-cluster supports an --allow-duplicate-host-fingerprints option that can be used to ignore duplicate SSH host keys.

Network Configuration

Depending on the host and its function in deployment, some or all of the following port settings should be enabled on hosts in your cluster.

These routing and firewall settings must be configured to:

  • Allow database clients (e.g. your application) to connect to the SingleStore aggregators

  • Allow all nodes in the cluster to talk to each other over the SingleStore protocol (3306)

  • Allow you to connect to management and monitoring tools

Protocol

Default Port

Direction

Description

TCP

22

Inbound and Outbound

For host access. Required between nodes in SingleStore tool deployment scenarios. Also useful for remote administration and troubleshooting on the main deployment host.

TCP

443

Outbound

To get public repo key for package verification. Required for nodes downloading SingleStore APT or YUM packages.

TCP

3306

Inbound and Outbound

Default port used by SingleStore. Required on all nodes for intra-cluster communication. Also required on aggregators for client connections.

The service port values are configurable if the default values cannot be used in your deployment environment. For more information on how to change them, see:

We also highly recommend configuring your firewall to prevent other hosts on the Internet from connecting to SingleStore.

Install SingleStore Tools

The first step in deploying your cluster is to download and install the SingleStore Tools on one of the hosts in your cluster. This host will be designated as the main deployment host for deploying SingleStore across your other hosts and setting up your cluster.

These tools perform all major cluster operations including downloading the latest version of SingleStore onto your hosts, assigning and configuring nodes in your cluster, and other management operations. For the purpose of this guide, the main deployment host is the same as the designated Master Aggregator of the SingleStore cluster.

Note: If SingleStore is installed as a sudo user via packages, systemd will automatically start the associated SingleStore processes when a host is rebooted.

Online Installation - Red Hat Distribution

Run the following commands to install SingleStore Tools.

sudo yum-config-manager --add-repo https://release.memsql.com/production/rpm/x86_64/repodata/memsql.repo && \
sudo yum install -y singlestoredb-toolbox singlestore-client

Troubleshooting

If SingleStore Tools cannot be installed using the above commands, verify the following and re-run the above commands to install SingleStore Tools.

  • Verify that the SingleStore repo information is listed under repolist.

    sudo yum repolist
    repo id            repo name            status
memsql             MemSQL               125

  • Verify that the which package is installed. This is used during the install process to identify the correct package type for your installation.

    rpm -q which

    • If which is not installed, you must install it before proceeding.

      sudo yum install -y which

    • If you cannot install which, you will need to specify the package as rpm during the deployment phase.

  • If you receive an error that the GPG check failed, which resembles the following:

    Importing GPG key <gpg-key>:
 Userid     : "MemSQL Release Engineering <security@memsql.com>"
 Fingerprint: <fingerprint>
 From       : https://release.memsql.com/release-aug2018.gpg
Key import failed (code 2). Failing package is: singlestore-client-1.0.7-1.x86_64
 GPG Keys are configured as: https://release.memsql.com/release-aug2018.gpg
Public key for singlestoredb-toolbox-1.13.13-9fa4ef2d34.x86_64.rpm is not installed.
Failing package is: singlestoredb-toolbox-1.13.13-1.x86_64
 GPG Keys are configured as: https://release.memsql.com/release-aug2018.gpg
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: GPG check FAILED

    • View the current crypto policies.

      update-crypto-policies --show

    • If SHA1 is not present, update the crypto policies to work with SingleStore Tools.

      sudo update-crypto-policies --set DEFAULT:SHA1

      Refer to Using system-wide cryptographic policies for more information.

Deploy SingleStore

Prerequisites

Warning

Before deploying a SingleStore cluster in a production environment, please review and follow the host configuration recommendations. Failing to follow these recommendations will result in sub-optimal cluster performance.

In addition, SingleStore recommends that each Master Aggregator and child aggregator reside on its own host when deploying SingleStore in a production environment.

Notes on Users and Groups

The user that deploys SingleStore via SingleStore Toolbox must be able to SSH to each host in the cluster. When singlestoredb-server is installed via an RPM or Debian package when deploying SingleStore, a memsql user and group are also created on each host in the cluster.

This memsql user does not have a shell, and attempting to log in or SSH as this user will fail. The user that deploys SingleStore is added to the memsql group. This group allows most Toolbox commands to run without sudo privileges, and members of this group can perform many Toolbox operations without the need to escalate to sudo. Users who desire to run SingleStore Toolbox commands must be added to the memsql group on each host in the cluster. They must also be able to SSH to each host.

Manually creating a memsql user and group is only recommended in a sudo-less environment when performing a tarball-based deployment of SingleStore. In order to run SingleStore Toolbox commands against a cluster, this manually-created memsql user must be configured so that it can SSH to each host in the cluster.

Minimal Deployment

SingleStore has been designed to be deployed with at least two nodes:

  • A Master Aggregator node that runs SQL queries and aggregates the results, and

  • A single leaf node, which is responsible for storing and processing data

These two nodes can be deployed on a single host (via the cluster-in-box option), or on two hosts, with one SingleStore node on each host.

While additional aggregators and nodes can be added and removed as required, a minimal deployment of SingleStore always consists of at least these two nodes.

Online Deployment Using YAML File

As of SingleStore Toolbox 1.3.0, the sdb-deploy setup-cluster command now accepts a YAML-based cluster configuration file (or simply “cluster file”), the format of which is validated before attempting to set up the specified cluster. Using a cluster file is the recommended method for creating new SingleStore clusters.

The command is designed to be consistent, where re-running the sdb-deploy setup-cluster command with the same cluster file will always produce the same cluster. This methods is also resilient, allowing errors encountered at any stage of the cluster construction process to be corrected, and sdb-deploy setup-cluster re-run, in order to generate the desired cluster.

Complete Cluster File Template

license:                           <LICENSE | /path/to/LICENSE-file> [Required to bootstrap Master Aggregator]
high_availability:                 <true | false>
memsql_server_version:             <the version of memsql you want to install (6.7+)>
memsql_server_file_path:           <path to the downloaded memsql server file>
memsql_server_preinstalled_path:   <equivalent to using the '--preinstalled-path' option;
                                   the path to the unpacked singlestoredb-server file
                                   where the unpacked folder name must be of the form
                                   'singlestoredb-server-<version>*' or
                                   'memsql-server-<version>*'>
skip_install:                      <true | false> [ADVANCED]
skip_validate_env:                 <true | false> [ADVANCED]
allow_duplicate_host_fingerprints: <true | false> [ADVANCED]
assert_clean_state:                <true | false> [ADVANCED]
package_type:                      <rpm | deb | tar> [Required if multiple package managers are present]
root_password:                     <default password to be used for all nodes>
optimize:                          <true | false>
optimize_config:
  memory_percentage:               <percentage of memory you want memsql to use>
  no_numa:                         <true | false>
sync_variables:                    [ADVANCED]
  <variable's name>:               <variable's value>            
hosts:
- hostname:                        <host-name> [Required]
  localhost:                       <true | false> 
  skip_auto_config:                <true | false>
  memsqlctl_path:                  <path to memsqlctl> [ADVANCED]
  memsqlctl_config_path:           <path to memsqlctl config> [ADVANCED]
  tar_install_dir:                 <path to tar install dir> [ADVANCED]
  tar_install_state:               <path to tar install state> [ADVANCED]
  ssh:                             [Required for remote Hosts]
    host:                          <ssh host name>
    port:                          <ssh port>
    user:                          <ssh user>
    private_key:                   <path to your identity key>
  nodes:
  - register:                      <true | false>
    force_registration:            <true | false> [ADVANCED] 
    role:                          <Unknown | Master | Leaf | Aggregator> (case sensitive) [Required]
    availability_group:            <availability group>
    no_start:                      <true | false>
    config: 
      auditlogsdir:                <path to auditlogs directory> [ADVANCED]
      baseinstalldir:              <path to base install directory> [ADVANCED]
      configpath:                  <path to configuration path> [ADVANCED] [Required if register is true]
      datadir:                     <path to data directory> [ADVANCED]
      disable_auto_restart:        <true | false>
      password:                    <password>
      plancachedir:                <path to plancache directory> [ADVANCED]
      port:                        <port number> [Required for node creation]
      tracelogsdir:                <path to tracelogs directory> [ADVANCED]
      bind_address:                <bind address> [ADVANCED]
      ssl_fips_mode:               <true | false > [ADVANCED]
    variables:
      <variable's name>:           <variable's value>

Deploy a Cluster

You can deploy your own SingleStore cluster with your desired cluster configuration using the cluster file template above, and/or the example cluster files in the following sections.

After creating the cluster file, you can deploy the corresponding SingleStorecluster via the sdb-deploy setup-cluster command.

Run the following with the path to the cluster file as input.

sdb-deploy setup-cluster --cluster-file </path/to/cluster-file>

Cluster File Notes

  • high_availability: Used to enable high availability on the cluster.

    • If set to true, each node may be assigned an availability group via the availability_group field.

    • Refer to Availability Groups for more information.

  • license: Use your license from the Cloud Portal. This can be the license itself, or the full path to a text file with the license in it.

  • singlestoredb-server_version: You may specify either a major release of SingleStore (such as 7.3) or a specific release (such as 7.3.10). When a major release is specified, the latest patch level of that release will be deployed.

  • Setting a Password: There are two ways to set a password in the cluster file YAML:

    • A global root password: Including the root_password field with a password will ensure that each node uses the same root password. Recommended. See Example 1.

    • A node-specific root password: Including a password field in each node definition. This is only recommended if your security protocols require each node to have its own root password. See Example 2.

  • register: Set the value of this field to false to create a new node. Set the value to true if the node is already present and you want to register it to SingleStore Toolbox. The configpath field and value are also required when register is set to true. Do not set this value to true to create a new node. For more information, refer to the sdb-deploy setup-cluster reference page.

  • Indicating a Host: You may use either an IP address or a hostname when indicating a host in the cluster file.

  • Aggregator Hosts: When deploying SingleStore, SingleStore recommends that you deploy each Aggregator to its own individual host. If the Master Aggregator goes down, the Child Aggregators can keep running queries, and coordinating and executing writes. In this scenarios, the only operations that can’t be done are DDL commands and reference table management, which must be done on the Master Aggregator.

  • Optimize the Cluster: SingleStore recommends that you include the optimize field in the cluster file and set it to true. Doing so checks your current cluster configuration against a set of best practices and either makes changes to maximize performance or provides recommendations for you. For hosts with NUMA support, this command will bind the leaf nodes to specific NUMA nodes.

Cluster File Examples

SingleStore uses a combination of aggregator and leaf nodes that are typically configured in a specific ratio. For more information, refer to Cluster Components.

The examples below deploy two different types of SingleStore cluster:

  • A multi-host, multi-node SingleStore cluster with four hosts, two aggregators, and two leaf nodes

  • A multi-host, multi-node SingleStore cluster with two hosts, a single aggregator, and two leaf nodes

These cluster file examples can be used as a starting point for deploying a SingleStore cluster that fulfills your specific requirements.

Additional Deployment Options

Note

If this deployment method is not ideal for your target environment, you can choose one that fits your requirements from the Deployment Options.

Connect to Your Cluster

The singlestore-client package contains is a lightweight client application that allows you to run SQL queries against your database from a terminal window.

After you have installed singlestore-client, use the singlestore application as you would use the mysql client to access your database.

For more connection options, help is available through singlestore --help.

singlestore -h <Master-or-Child-Aggregator-host-IP-address> -P <port> -u <user> -p<secure-password>
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.5.58 MemSQL source distribution (compatible; MySQL Enterprise & MySQL Commercial)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

singlestore>

Refer to Connect to SingleStore for additional options for connecting to SingleStore.

Next Steps After Deployment

Now that you have installed SingleStore, check out the following resources to learn more about SingleStore:

  • Optimizing Table Data Structures: Learn the difference between rowstore and columnstore tables, when you should pick one over the other, how to pick a shard key, and so on.

  • How to Load Data into SingleStore: Describes the different options you have when ingesting data into a SingleStore cluster.

  • How to Run Queries: Provides example schema and queries to begin exploring the potential of SingleStore.

  • Configure Monitoring: SingleStore’s native monitoring solution is designed to capture and reveal cluster events over time. By analyzing this event data, you can identify trends and, if necessary, take action to remediate issues.

  • Tools Reference: Contains information about SingleStore Tools, including Toolbox and related commands.

Last modified: September 18, 2023

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