硬盘太小，dd系统后默认swap太大怎么办，动动手拯救那virmach小硬盘吧。
本笔记适用于dd系统后swap位于独立swap分区上，而需要把swap分区容量回归到主分区上的问题
首先查看Swap位置
swapon -s
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root@:~# swapon -s Filename Type Size Used Priority /dev/vda5 partition 2094076 0 -1 |
关闭SWAP
/sbin/swapoff /dev/vda5
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root@:~# /sbin/swapoff /dev/vda5 |
将其删除开机启动
nano /etc/fstab
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找到并删除类似于 UUID=e882xe3f-48xx-4bxx-9cea-01f1af74exxx none swap sw 0 $ 0 |
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保存并重启，然后删除swap占用硬盘容量的分区 |
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root@:~# fdisk -l Disk /dev/vda: 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/vda1 * 2048 37750783 37748736 18G 83 Linux /dev/vda2 37752830 41940991 4188162 2G 5 Extended /dev/vda5 37752832 41940991 4188160 2G 82 Linux swap / Solaris root@:~# fdisk /dev/vda 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 Partition number (1,2,5, default 5): 5 Partition 5 has been deleted. Command (m for help): d Partition number (1,2, default 2): 2 Partition 2 has been deleted. Command (m for help): w 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). root@:~# |
扩容
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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。 centos： # yum install gdisk -y Debian： # apt-get install gdisk -y |
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root@:~# growpart /dev/vda 1 failed [pt_update:1] pt_update /dev/vda 1 partx: /dev/vda: error updating partition 1 FAILED: pt_resize failed root@:~# resize2fs /dev/vda1 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/vda1 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，重启后再次执行resize2fs /dev/vda1
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root@:~# resize2fs /dev/vda1 resize2fs 1.43.4 (31-Jan-2017) Filesystem at /dev/vda1 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 -h Filesystem Size Used Avail Use% Mounted on udev 992M 0 992M 0% /dev tmpfs 201M 2.9M 198M 2% /run /dev/vda1 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 root@:~# |
完成！白花花的2G容量回归了主分区上。
如果再次需要swap的话，可以运行一键添加swap脚本，这个脚本可以很轻松的添加/删除swap，而且添加的swap位于主分区上可以随时拆装。
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一键添加/删除Swap虚拟内存（不支持open vz） ： wget https://www.moerats.com/usr/shell/swap.sh && bash swap.sh |
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