Class: ActivePostgres::Failover

Inherits:
Object
  • Object
show all
Defined in:
lib/active_postgres/failover.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Failover

Returns a new instance of Failover.



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# File 'lib/active_postgres/failover.rb', line 5

def initialize(config)
  @config = config
  @ssh_executor = SSHExecutor.new(config)
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/active_postgres/failover.rb', line 3

def config
  @config
end

#ssh_executor ⇒ Object (readonly)

Returns the value of attribute ssh_executor.



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# File 'lib/active_postgres/failover.rb', line 3

def ssh_executor
  @ssh_executor
end

Instance Method Details

#promote(host_or_node) ⇒ Object

Raises:



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# File 'lib/active_postgres/failover.rb', line 10

def promote(host_or_node)
  # Determine target host
  target_host = resolve_host(host_or_node)

  raise Error, "Could not resolve host: #{host_or_node}" unless target_host

  raise Error, "Host is not a standby: #{target_host}" unless config.standby_hosts.include?(target_host)

  puts "==> Promoting #{target_host} to primary..."
  puts
  puts 'WARNING: This will promote the standby to primary.'
  puts 'Make sure to update your database.yml and restart your application.'
  puts
  print 'Continue? (y/N): '

  response = $stdin.gets.chomp
  unless response.downcase == 'y'
    puts 'Cancelled.'
    return
  end

  # Perform promotion
  if config.component_enabled?(:repmgr)
    promote_with_repmgr(target_host)
  else
    promote_manual(target_host)
  end

  puts "\n✓ Promotion complete!"
  puts "\nNext steps:"
  puts "  1. Update database.yml to point to new primary: #{target_host}"
  puts '  2. Restart your application'
  puts '  3. Rebuild old primary as new standby (if needed)'
end