expand ext4 partition

It is very ease to expand ext4 partition with  growpart . 

 

 Backup current partition table 

 

 

 sfdisk -d /dev/sdb > sdb_partition_bak.dmp 

 

 

 Execute dry-run to see what will be changed. If you don't have this tool. Run  apt-get install cloud-utils 

 

 

 growpart -N /dev/sdb 1 

 

 

 If everything is fine 

 

 

 growpart /dev/sdb 1 

 

 

 Resize file system. It may take 10 seconds 

 

 

 resize2fs /dev/sdb1 

 

 

 Check the new size 

 

 

 df -h