Chaindata Change

💡 THIS GUIDE IS BASED ON Amazon Linux 2
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.)
💡 Assuming that the new path is `/var/kcnd2`
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
Option 2 - Current Disk (not recommended)
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 
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# (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
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# (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
🚨 TBD
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)
💡 If reboot is required to add an additional disk, reboot the instance.
1.IMPORTANT Remove CN node in Klaytn council if the node type is CN
2.Restart process or reboot instance

Klaytn Command

Chaindata Migration

Last modified 5mo ago