DD Linux后删除swap分区

1. 首先查看Swap位置：swapon -s

Filename                                Type            Size    Used    Priority
/dev/sda5                               partition       2094076 0       -1

2. 关闭Swap：
   /sbin/swapoff /dev/sda5
3. 删除开机启动：vim /etc/fstab

找到并删除类似于：
UUID=e882xe3f-48xx-4bxx-9cea-01f1af74exxx none            swap    sw              0      $       0

4. 保存，reboot 重启，然后删除Swap占用硬盘容量的分区

   root@:~# fdisk -l     #查看分区
   Disk /dev/sda: 20 GiB, 21474836480 bytes, 41943040 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
   Disklabel type: dos
   Disk identifier: 0xb4b4e733
   
   Device     Boot    Start      End  Sectors Size Id Type
   /dev/sda1  *        2048 37750783 37748736  18G 83 Linux
   /dev/sda2       37752830 41940991  4188162   2G  5 Extended
   /dev/sda5       37752832 41940991  4188160   2G 82 Linux swap / Solaris
   
   root@:~# fdisk /dev/sda     #此处"/dev/sda" 根据你的显示进行修改
   Welcome to fdisk (util-linux 2.29.2).
   Changes will remain in memory only, until you decide to write them.
   Be careful before using the write command.
   
   Command (m for help):d     #删除
   Partition number (1,2,5, default 5):5     #序号为"5"的分区
   Partition 5 has been deleted.
   
   Command (m for help):d     #删除
   Partition number (1,2, default 2): 2     #序号为"2"的分区
   Partition 2 has been deleted.
   
   Command (m for help):w     #保存
   The partition table has been altered.
   Calling ioctl() to re-read partition table.
   Re-reading the partition table failed.: 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).
   

5. 将删除的空间扩容至主空间

   安装growpart软件
   
   # centos：
   
   yum install -y cloud-utils-growpart
   
   # Debian：
   
   apt install -y cloud-guest-utils
   
   #如果你硬盘是GPT格式的请安装以下软件，MBR格式请忽略。——怎么查看硬盘格式是GPT，还是MBR？这个见本文最下方。
   
   # centos：
   
   yum install gdisk -y
   
   # Debian：
   
   apt-get install gdisk -y
   

   root@:~# growpart /dev/sda 1
   failed [pt_update:1] pt_update /dev/sda 1
   partx: /dev/sda: error updating partition 1
   FAILED: pt_resize failed
   
   root@:~# resize2fs /dev/sda1
   resize2fs 1.43.4 (31-Jan-2017)
   The filesystem is already 4718592 (4k) blocks long.  Nothing to do!
   
   root@:~# df -h
   Filesystem      Size  Used Avail Use% Mounted on
   udev            992M     0  992M   0% /dev
   tmpfs           201M  2.9M  198M   2% /run
   /dev/sda1        18G  742M   16G   5% /
   tmpfs          1003M     0 1003M   0% /dev/shm
   tmpfs           5.0M     0  5.0M   0% /run/lock
   tmpfs          1003M     0 1003M   0% /sys/fs/cgroup
   tmpfs           201M     0  201M   0% /run/user/0
   

如果 df -h 显示未成功扩容，则 reboot 重启后再次执行 resize2fs /dev/sda1

root@:~# resize2fs /dev/sda1resize2fs 1.43.4 (31-Jan-2017)
Filesystem at /dev/sda1 is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 3
The filesystem on /dev/vda1 is now 5242619 (4k) blocks long.root@:~# df -hFilesystem      Size  Used Avail Use% Mounted on
udev            992M     0  992M   0% /dev
tmpfs           201M  2.9M  198M   2% /run
/dev/sda1        20G  742M   18G   4% /
tmpfs          1003M     0 1003M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs          1003M     0 1003M   0% /sys/fs/cgroup
tmpfs           201M     0  201M   0% /run/user/0

常见问题：

• 怎么查看硬盘格式是GPT，还是MBR？
  方法一：

  fdisk -l
  

  方法二：

  parted -l