背景
当前市面上大部分的云服务器产品,在购买Linux服务器并启动后,通常只帮我们挂载了系统盘到/目录。我们所购买的数据盘并没有帮我们挂载到系统。查看内存配置,一般swap也为0。
这里我们可以利用购买的数据盘来创建swap分区与数据分区,并将他们挂载到系统中去。
操作
1,查看当前的磁盘,如下,/dev/vda为系统盘,/dev/vdb为数据盘:
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# fdisk -l Disk /dev/vda : 53.7 GB, 53687091200 bytes, 104857600 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 label type : dos
Disk identifier: 0x0008e9bc Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 104857566 51379183+ 83 Linux
Disk /dev/vdb : 429.5 GB, 429496729600 bytes, 838860800 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
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2,对/dev/vdb进行分区操作,分割16G空间做swap,剩余空间做数据盘。
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# fdisk /dev/vdb Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command .
Device does not contain a recognized partition table Building a new DOS disklabel with disk identifier 0xb07be21f. Command (m for help): n
Partition type :
p primary (0 primary, 0 extended, 4 free )
e extended
Select (default p): p Partition number (1-4, default 1): First sector (2048-838860799, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-838860799, default 838860799): +16G Partition 1 of type Linux and of size 16 GiB is set
Command (m for help): n
Partition type :
p primary (1 primary, 0 extended, 3 free )
e extended
Select (default p): p Partition number (2-4, default 2): First sector (33556480-838860799, default 33556480): Using default value 33556480 Last sector, +sectors or +size{K,M,G} (33556480-838860799, default 838860799): Using default value 838860799 Partition 2 of type Linux and of size 384 GiB is set
Command (m for help): w
The partition table has been altered! Calling ioctl() to re- read partition table.
Syncing disks. # fdisk -l Disk /dev/vda : 53.7 GB, 53687091200 bytes, 104857600 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 label type : dos
Disk identifier: 0x0008e9bc Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 104857566 51379183+ 83 Linux
Disk /dev/vdb : 429.5 GB, 429496729600 bytes, 838860800 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 label type : dos
Disk identifier: 0x53b4d701 Device Boot Start End Blocks Id System
/dev/vdb1 2048 33556479 16777216 83 Linux
/dev/vdb2 33556480 838860799 402652160 83 Linux
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可以看到创建了2个分区/dev/vdb1,/dev/vdb2。
3,创建swap分区,并启用:
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# mkswap /dev/vdb1 # swapon /dev/vdb1 |
4,把/dev/vdb2格式化,并挂载到/data目录下:(这里格式成xfs文件系统)
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# mkdir -p /data # mkfs.xfs /dev/vdb2 # mount /dev/vdb2 /data |
5,检查是否生效:
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# df -kh Filesystem Size Used Avail Use% Mounted on /dev/vda2 49G 1.7G 45G 4% /
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 25M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/vda1 976M 146M 764M 16% /boot
tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/vdb2 384G 33M 384G 1% /data
# free -m total used free shared buff /cache available
Mem: 15885 393 14628 24 863 15158 |
6,把磁盘挂载信息写进fstab,使之开启自动挂载:
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# vi /etc/fstab /dev/vdb1 swap swap defaults 0 0
/dev/vdb2 /data xfs defaults 0 0
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本文转自 icenycmh 51CTO博客,原文链接:http://blog.51cto.com/icenycmh/2065057,如需转载请自行联系原作者