Fdisk is fine with MBR could be limited when used for GPT, in this case see parted.

    Resize partition

    Important: this example consider a single partition on the device.

    unmount /mnt/disk
    fdisk /dev/vdb
    Command (m for help): d # delete
    Command (m for help): n # new
    Select (default p):
    Using default response p.
    Partition number (1-4, default 1):
    First sector (2048-146800639, default 2048):
    Last sector, +sectors or +size{K,M,G,T,P} (2048-146800639, default 146800639):
    Created a new partition 1 of type 'Linux' and of size 70 GiB.
    Command (m for help): w
    The partition table has been altered.
    Calling ioctl() to re-read partition table.
    Syncing disks.
    e2fsck -f /dev/vdb1
    e2fsck 1.42.12 (29-août-2014)
    Pass 1: Checking inodes, blocks, and sizes
    Pass 2: Checking directory structure
    Pass 3: Checking directory connectivity
    Pass 4: Checking reference counts
    Pass 5: Checking group summary information
    /dev/vdb: 12/3276800 files (0.0% non-contiguous), 251700/13107200 blocks
    resize2fs /dev/vdb1
    resize2fs 1.42.12 (29-Aug-2014)
    Resizing the filesystem on /dev/vdb to 18350080 (4k) blocks.
    The filesystem on /dev/vdb is now 18350080 (4k) blocks long.
    mount /dev/vdb1 /mnt/disk/
    df -h /mnt/disk