setup a cluster of redis masters on your local machine. support single instance or cluster (3+).

setup-redis-cluster

// must have: redis-cli, redis-server executables
// need npm modules: @stavalfi/create-folder-structure, execa, lodash
// tested on node 14. 

// RUN single instance: `ts-node <file-name>.ts 1`
// RUN cluster of masters only: `ts-node <file-name>.ts 3` // can be 3+

// close with ctrl+c. make sure ports are closed after that as well.

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// NOT production ready!!!! it's for developement only!!!!
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import { createFolder } from '@stavalfi/create-folder-structure'
import execa from 'execa'
import _ from 'lodash'
import path from 'path'

async function main(argv: string[]) {
  const instances = argv[0] !== undefined ? Number(argv[0]) : 3
  if (instances <= 0 || instances === 2) {
    throw new Error(`count of instances must be 1 or 3+`)
  }
  const nodesPorts = _.range(7000, 7000 + instances)
  const nodesAddresses = nodesPorts.map(port => `127.0.0.1:${port}`).join(' ')

  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log(`starting redis-masters: ${nodesAddresses}...`)
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')

  const [redisClusterDirPath] = await Promise.all([
    createFolder({
      'redis-cluster-setup': Object.fromEntries(
        nodesPorts.map(port => [
          port,
          {
            'redis.conf':
              nodesPorts.length > 1
                ? `
            port ${port}
            cluster-enabled yes
            cluster-config-file nodes.conf
            cluster-node-timeout 5000
            appendonly no
            save ""`
                : `
            port ${port}
            cluster-enabled no
            appendonly no
            save ""`,
          },
        ]),
      ),
    }),
    execa.command(`yarn kill-used-dev-ports`, {
      cwd: '..',
    }),
  ])

  nodesPorts.map(nodePort => {
    const folder = path.join(redisClusterDirPath, 'redis-cluster-setup', nodePort.toString())
    return execa.command(`redis-server ${path.join(folder, 'redis.conf')}`, {
      cwd: folder,
      shell: true,
      stdout: 'inherit',
    })
  })

  if (nodesPorts.length > 1) {
    await new Promise(resolve => setTimeout(resolve, 3000))

    await execa.command(`redis-cli --cluster create ${nodesAddresses} --cluster-replicas 0 --cluster-yes`, {
      stdout: 'inherit',
    })
  }

  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log(`started redis-masters: ${nodesAddresses}...`)
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
  console.log('----------------------------------------------------------------------------')
}

main(process.argv.slice(2))