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Change Chaindata

CN Node Migration STEP

Create new disk

  1. Preparing new disk (3,500GB disk) or creating new path on the current disk (It must have 3,500GB available.)

Option 1 - New disk (more than 2500GB)

  1. Attach the disk to EC2 and run the command below

$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme2n1 259:0 0 3500G 0 disk **# New Disk**
nvme1n1 259:0 0 4000G 0 disk /var/kcnd
nvme0n1 259:2 0 8G 0 disk
├─nvme0n1p1 259:3 0 8G 0 part /
└─nvme0n1p128 259:4 0 1M 0 part

  1. Mount it following the process below

$ sudo e2fsck -f /dev/nvme2n1
$ sudo mkfs -t ext4 /dev/nvme2n1
$ sudo mkdir /var/kcnd2
$ sudo mount /dev/nvme2n1 /var/kcnd2
$ sudo mkdir /var/kcnd2/data
$ sudo mkdir /var/kcnd2/log

  1. Create New Folder

$ sudo mkdir /var/kcnd2/data
$ sudo mkdir /var/kcnd2/log

Download the latest chaindata

Download Chain Data to the data of the new Klaytn Data DIR. (You can check the details on Chain Data in https://packages.klaytn.net/cypress/chaindata/)

  1. Download with the following command

# (Option 1: recommended) curl
$ curl -o klaytn-cypress-chaindata-2021???????????.tar.gz "https://s3.ap-northeast-2.amazonaws.com/klaytn-chaindata/cypress/klaytn-cypress-chaindata-2021???????????.tar.gz"
# (Option 2) aws s3 command
$ aws s3 cp s3://klaytn-chaindata/cypress/klaytn-cypress-chaindata-2021???????????.tar.gz klaytn-cypress-chaindata-20211113011111.tar.gz
# (Option 3) axel (need to install axel)
sudo amazon-linux-extras install epel -y
sudo yum install axel pigz
$ axel -n8 https://s3.ap-northeast-2.amazonaws.com/klaytn-chaindata/cypress/klaytn-cypress-chaindata-2021???????????.tar.gz

  1. Decompress

# (Option 1: recommended) tar
$ tar -xvf klaytn-cypress-chaindata-2021???????????.tar.gz
# (Option 2) pigz (need to isntall pigz)
$ tar -I pigz -xvf klaytn-cypress-chaindata-2021???????????.tar.gz

Configure DATA_DIR & LOG_DIR

Option 1 - Swap the old & new path

  1. Stop klaytn daemon process before swap

    1. IMPORTANT Remove CN node in Klaytn council if the node type is CN

    💡 You can get packages for EN in the Startup the CN.

  2. Swap the old and new path

    1. New Disk


      umount /var/kcnd # old path
      umount /var/kcnd2 # new path
      mount /dev/nvme2n1 /var/kcnd

    💡 These commands should be executed with the appropriate privileges.

    1. Current Disk


      sudo mv /var/kcnd /var/kcnd_old # old_path
      sudo mv /var/kcnd2 /var/kcnd # new path

  3. (Optional) Delete the old path if it is not required anymore

Option 2 - Update DATA_DIR & LOG_DIR in klaytn config file

  1. Klaytn DIR Path Change
    • Option 1 - New disk
      • Change fstab value from old disk to new disk
    • Option 2 - Current disk
      • change the DIR Path from kcnd.conf

Restart Process(or Reboot Instance)

  1. IMPORTANT Remove CN node in Klaytn council if the node type is CN
  2. Restart process or reboot instance
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