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Use Chaindata Snapshots

You can start a node from an already-synced database called a chaindata snapshot. A chaindata snapshot is a compressed Kaia data directory.

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This saves time to Full Sync the whole blockchain, allowing you to relatively quickly start a new node or recover from corrupt database.

Prepare Data Directory

Before start, prepare enough disk space to accommodate both compressed file and uncompressed directory.

• If you're going to start from an empty machine, simply create a datadir.
  
  

  sudo mkdir /var/kend

  
  
• If you're going to swap the existing directory, create a temporary directory.
  • Option 1. Mount a new disk (Recommended for optimal disk utilization)
    
    

    $ lsblk

    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

    nvme2n1 259:0 0 3500G 0 disk /var/kend2 # New disk at temporary path

    nvme1n1 259:0 0 4000G 0 disk /var/kcnd # Old disk at production path

    nvme0n1 259:2 0 8G 0 disk

    ├─nvme0n1p1 259:3 0 8G 0 part /

    └─nvme0n1p128 259:4 0 1M 0 part

    
    
  • Option 2. Use existing disk
    
    

    sudo mkdir /var/kend2/data

    
    

Download the File

Download a compressed file to the new directory. URLs can be found at the bottom of this page.

• Option 1. curl
  
  

  curl -O https://s3.ap-northeast-2.amazonaws.com/klaytn-chaindata/mainnet/kaia-mainnet-chaindata-xxxxxxxxxxxxxx.tar.gz

  
  
• Option 2. wget
  
  

  wget https://s3.ap-northeast-2.amazonaws.com/klaytn-chaindata/mainnet/kaia-mainnet-chaindata-xxxxxxxxxxxxxx.tar.gz

  
  
• Option 3. axel
  
  

  # Amazon Linux installation example

  sudo amazon-linux-extras install epel

  sudo yum install axel pigz

  # Multi-threaded download and print status bar

  axel -n8 https://s3.ap-northeast-2.amazonaws.com/klaytn-chaindata/mainnet/kaia-mainnet-chaindata-xxxxxxxxxxxxxx.tar.gz | awk -W interactive '$0~/\[/{printf "%s'$'\r''", $0}'

  
  

Decompress the File

• Option 1. tar
  
  

  tar -xvf kaia-mainnet-chaindata-xxxxxxxxxxxxxx.tar.gz

  
  
• Option 2. tar and pigz
  
  

  # Amazon Linux installation example

  sudo yum install pigz

  # Multi-threaded decompression

  tar -I pigz -xvf kaia-mainnet-chaindata-xxxxxxxxxxxxxx.tar.gz

  
  

Swap the data directory

• First, stop the node.
  • IMPORTANT: If you are running a consensus node (CN), make sure to remove the node from the Council.
• Option 1. Swap the content at the same path
  • If you mounted new disk, change the mount.
    
    

    umount /var/kend # Old disk

    umount /var/kend2 # New disk at temporary path

    mount /dev/nvme2n1 /var/kend # New disk at production path

    
    
  • If you used existing disk, rename the directory.
    
    

    mv /var/kend /var/kend_old # Old data

    mv /var/kend2 /var/kend # New data

    
    
• Option 2. Change the path in the node configuraion
  • Change DATA_DIR value in the kend.conf file.
• Optionally delete old data and tar.gz file.
• Finally, start the node.

Downloads

For efficiency, only batch pruned (state migrated) or live pruned database are provided. Read Storage Optimization for their concepts. If you want a full database without neither pruning, or even archive data, perform a fresh full sync from genesis.

network	sync options	download
mainnet	state migrated	https://packages.kaia.io/mainnet/chaindata/
mainnet	live pruning	https://packages.kaia.io/mainnet/pruning-chaindata/
kairos	state migrated	https://packages.kaia.io/kairos/chaindata/
kairos	live pruning	https://packages.kaia.io/kairos/pruning-chaindata/