This is the procedure to resize a VM image that has single flat primary partition.
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resize the disk image
# qemu-img resize <vmname>.qcow2 +<additional new size>G or # qemu-img resize <vmname>.qcow2 <new size>G -
resize the partition table (make sure DOS Compatibility flag is not set and display units is sectors)
# fdisk <disk name> # fdisk /dev/vda WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): c DOS Compatibility flag is not set -------> WARNING! some linux version has DOS Compatibility is already unset Command (m for help): u Changing display/entry units to sectors -------> WARNING! some linux version has unit set as sector by default Command (m for help): p Disk /dev/vda: 85.9 GB, 85899345920 bytes 255 heads, 63 sectors/track, 10443 cylinders, total 167772160 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00050c05 Device Boot Start End Blocks Id System /dev/vda1 * 2048 16777215 8387584 83 Linux Command (m for help): d Selected partition 1 Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First sector (2048-167772159, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-167772159, default 167772159): Using default value 167772159 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. # -
resize filesystem
# resize2fs <partition name>
# resize2fs /dev/vda1