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添加交换分区swap
方法一：新建分区
使用fdisk工具新建一个分区
[root@VM_168_102_centos ~]# fdisk /dev/xvdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0xad066822. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won‘t be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) 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): p Disk /dev/xvdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xad066822 Device Boot Start End Blocks Id System Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-1305, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +2G Command (m for help): p Disk /dev/xvdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xad066822 Device Boot Start End Blocks Id System /dev/xvdb1 1 262 2104483+ 83 Linux Command (m for help): t #调整分区类型 Selected partition 1 Hex code (type L to list codes): 82 Changed system type of partition 1 to 82 (Linux swap / Solaris) Command (m for help): p Disk /dev/xvdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xad066822 Device Boot Start End Blocks Id System /dev/xvdb1 1 262 2104483+ 82 Linux swap / Solaris
将/dev/xvdb1分区格式为交换分区
[root@VM_168_102_centos ~]# mkswap /dev/xvdb1 Setting up swapspace version 1, size = 2104476 KiB no label, UUID=4bd9be30-3473-4db3-8b3d-0cd930347ba1
挂载交换分区
[root@VM_168_102_centos ~]# swapon /dev/xvdb1 [root@VM_168_102_centos ~]# swapon –s Filename Type Size Used Priority /dev/xvdb1 partition 2104472 0 -1
卸载交换分区
[root@VM_168_102_centos ~]# swapoff /dev/xvdb1 [root@VM_168_102_centos ~]# free total used free shared buffers cached Mem: 1018532 123916 894616 0 14624 41096 -/+ buffers/cache: 68196 950336 Swap: 0 0 0 [root@VM_168_102_centos ~]# swapon -s Filename Type Size Used Priority
方法二：新建虚拟内存文件
创建1G的空文件
[root@VM_168_102_centos tmp]# dd if=/dev/zero of=/tmp/swap1 bs=1M count=1024 #创建1G的空文件swap1 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 4.66541 s, 230 MB/s
[root@VM_168_102_centos tmp]# ls -lh s* -rw-r--r-- 1 root root 1.0G Aug 22 16:01 swap1
将/tmp/swap1格式为交换分区
[root@VM_168_102_centos tmp]# mkswap /tmp/swap1 Setting up swapspace version 1, size = 1048572 KiB no label, UUID=dbbc7b8d-d77e-426d-aa9f-fe1e4204a09e [root@VM_168_102_centos tmp]# free total used free shared buffers cached Mem: 1018532 930276 88256 0 11420 830364 -/+ buffers/cache: 88492 930040 Swap: 0 0 0
挂载交换分区
[root@VM_168_102_centos tmp]# swapon /tmp/swap1 [root@VM_168_102_centos tmp]# swapon -s Filename Type Size Used Priority /tmp/swap1 file 1048568 0 -1 [root@VM_168_102_centos tmp]# free total used free shared buffers cached Mem: 1018532 931516 87016 0 11596 830548 -/+ buffers/cache: 89372 929160 Swap: 1048568 0 1048568
卸载交换分区
[root@VM_168_102_centos tmp]# swapoff /tmp/swap1 [root@VM_168_102_centos tmp]# swapon -s Filename Type Size Used Priority [root@VM_168_102_centos tmp]# free total used free shared buffers cached Mem: 1018532 931044 87488 0 11696 830620 -/+ buffers/cache: 88728 929804 Swap: 0 0 0
添加交换分区swap
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