首页 > 代码库 > 西部开源学习笔记BOOK2-《unit 4》
西部开源学习笔记BOOK2-《unit 4》
##############################
##### unit4.管理系统存储 #####
##############################
#########1.分区划分##########
[root@localhost ~]# 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 0x2f15e742.
Command (m for help): m ##帮助
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition ##删除分区
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types ##列出系统可用的分区类型
m print this menu
n add a new partition ##新建分区
o create a new empty DOS partition table
p print the partition table ##显示分区
q quit without saving changes ##退出
s create a new empty Sun disklabel
t change a partition‘s system id ##修改分区功能id
u change display/entry units
v verify the partition table
w write table to disk and exit ##保存更改到分区表
x extra functionality (experts only)
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free) ##分区类型为主分区
e extended ##分区类型为扩展分区
Select (default p): p ##默认选p
Partition number (1-4, default 1): ##主分区id
First sector (2048-20971519, default 2048): ##此分区起始位置
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +100M ##分区大小
Partition 1 of type Linux and of size 100 MiB is set
Command (m for help): p
Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 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: 0x2f15e742
Device Boot Start End Blocks Id System
/dev/vdb1 2048 206847 102400 83 Linux
Command (m for help): wq ##保存退出，如果按q表示放弃更改退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]# partprobe ##同步分区表（更新分区表）
[root@localhost ~]# cat /proc/partitions ##格式化
major minor #blocks name
253 0 10485760 vda
253 1 10484142 vda1
253 16 10485760 vdb
253 17 102400 vdb1
253 20 1 vdb4
注意：扩展分区的分区起始位置和分区大小都选择建议选择默认。
扩展分区的大小显示为1
###########2.磁盘分区格式化##########
[root@localhost ~]# blkid ##显示可用的磁盘分区
/dev/vda1: UUID="9bf6b9f7-92ad-441b-848e-0257cbb883d1" TYPE="xfs"
[root@localhost ~]# mount /dev/vdb1 /mnt/ ##挂载分区
mount: /dev/vdb1 is write-protected, mounting read-only
mount: unknown filesystem type ‘(null)‘ ##该磁盘分区不可挂载，因为文件系统无法识别
[root@localhost ~]# mkfs. ##按tab之后会显示该系统可格式化的文件系统类型
mkfs.btrfs mkfs.ext2 mkfs.ext4 mkfs.minix mkfs.vfat
mkfs.cramfs mkfs.ext3 mkfs.fat mkfs.msdos mkfs.xfs
[root@localhost ~]# mkfs.xfs /dev/vdb1 ##linux一般选择xfs文件系统
meta-data=http://www.mamicode.com/dev/vdb1 isize=256 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
注意：扩展分区不用修改文件系统
###########3.swap分区###########
[root@localhost ~]# vim /etc/fstab
#
# /etc/fstab
# Created by anaconda on Wed May 7 01:22:57 2014
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk‘
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=9bf6b9f7-92ad-441b-848e-0257cbb883d1 / xfs defaults 1 1
/dev/vdb6 swap swap defaults 0 0
/dev/vdb5 /mnt xfs defaults 0 0
|| || || || || ||
设备名称 挂载点 设备类型 挂载参数 是否备份 是否检测
#########4.磁盘加密##########
1.磁盘加密
（1）.创建一个磁盘
[root@desktop19 ~]# fdisk /dev/vdb
.... ##此过程参照第一小节
[root@desktop19 ~]# cat /proc/partitions
major minor #blocks name
253 0 10485760 vda
253 1 10484142 vda1
253 16 10485760 vdb
253 17 102400 vdb1
（2）.加密
[root@desktop19 ~]# cryptsetup luksFormat /dev/vdb1
WARNING!
========
This will overwrite data on /dev/vdb1 irrevocably.
Are you sure? (Type uppercase yes): YES
Enter passphrase: ##密码必须是大于8位的字符数字组合
Verify passphrase:
[root@desktop19 ~]# mount /dev/vdb1 /mnt/
mount: unknown filesystem type ‘crypto_LUKS‘ ##无法挂载，因为无法识别该分区的文件系统
（3）.打开锁
[root@desktop19 ~]# cryptsetup open /dev/vdb1 tbr
Enter passphrase for /dev/vdb1:
[root@desktop19 ~]# ll /dev/mapper/
total 0
crw-------. 1 root root 10, 236 11月 5 20:58 control
lrwxrwxrwx. 1 root root 7 11月 5 21:27 tbr -> ../dm-0
（4）.创建文件系统
[root@desktop19 ~]# mkfs.xfs /dev/mapper/tbr
meta-data=http://www.mamicode.com/dev/mapper/tbr isize=256 agcount=4, agsize=6272 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=25088, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
(5).挂载
[root@desktop19 ~]# mount /dev/mapper/tbr /mnt/
============这之后就可以在挂载好的/mnt/路径下作操作了===========
(6).卸载
[root@desktop19 ~]# cryptsetup close tbr
device-mapper: remove ioctl on tbr failed: Device or resource busy
[root@desktop19 ~]# umount /dev/mapper/tbr
（7）.关闭锁
[root@desktop19 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3809024 6664876 37% /
devtmpfs 927072 0 927072 0% /dev
tmpfs 942660 84 942576 1% /dev/shm
tmpfs 942660 17092 925568 2% /run
tmpfs 942660 0 942660 0% /sys/fs/cgroup
2.加密磁盘的永久挂载
[root@desktop19 ~]# df ##当前状态/dev/mapper/tbr并未挂载到/mnt下
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3809024 6664876 37% /
devtmpfs 927072 0 927072 0% /dev
tmpfs 942660 84 942576 1% /dev/shm
tmpfs 942660 17092 925568 2% /run
tmpfs 942660 0 942660 0% /sys/fs/cgroup
[root@desktop19 ~]# vim /etc/crypttab
tbr /dev/vdb1 /root/lukspsfile
|| || ||
解密后设备管理文件 设备 加密字符存放文件
[root@desktop19 ~]# vim /root/lukspsfile ##配置加密字符存放文件
tbr952q8 ##加密时用的密码
[root@desktop19 ~]# chmod 600 /root/lukspsfile ##修改加密配置文件的权限为只有root可rw
[root@desktop19 ~]# cryptsetup luksAddKey /dev/vdb1 /root/lukspsfile
Enter any passphrase:
##关联磁盘，加密文件
[root@desktop19 ~]# vim /etc/fstab ##设置开机自动挂载
/dev/mapper/tbr /mnt xfs defaults 0 0
[root@desktop19 ~]# reboot ##重启
[root@desktop19 ~]# df ##当重启之后/dev/mapper/tbr就已经挂载到/mnt下了
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3808176 6665724 37% /
devtmpfs 927072 0 927072 0% /dev
tmpfs 942660 84 942576 1% /dev/shm
tmpfs 942660 17036 925624 2% /run
tmpfs 942660 0 942660 0% /sys/fs/cgroup
/dev/mapper/tbr 96940 5176 91764 6% /mnt
3.加密清除
[root@desktop19 ~]# vim /etc/fstab ##删除开机自动挂载的配置
/dev/mapper/tbr /mnt xfs defaults 0 0 ##删除该行
[root@desktop19 ~]# > /etc/crypttab ##删除
[root@desktop19 ~]# rm -fr /root/lukspsfile
[root@desktop19 ~]# umount /mnt/
[root@desktop19 ~]# cryptsetup close tbr
[root@desktop19 ~]# mkfs.xfs /dev/vdb1
mkfs.xfs: /dev/vdb1 appears to contain an existing filesystem (crypto_LUKS).
mkfs.xfs: Use the -f option to force overwrite.
[root@desktop19 ~]# mkfs.xfs /dev/vdb1 -f
meta-data=http://www.mamicode.com/dev/vdb1 isize=256 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
###########5.磁盘阵列############
软raid====硬raid
raid 0 1 5
0:2块磁盘同时存1份数据
1:2块磁盘同时存两份数据
5:0+1
1.创建磁盘阵列
监控命令：
[root@desktop19 ~]# watch -n 1 cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 vdb3[2](S) vdb2[1] vdb1[0] ##（S）-spare表示该设备闲置
102272 blocks super 1.2 [2/2] [UU]
(1).先创建3个磁盘，并依次将其id改为fd
Command (m for help): t
Partition number (1-3, default 3): 1
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes): fd ##在L中查看id号是：fd Linux raid auto
Changed type of partition ‘Linux‘ to ‘Linux raid autodetect‘
（2）.创建磁盘阵列
[root@desktop19 ~]# mdadm -C /dev/md0 -a yes -l 1 -n 2 -x 1 /dev/vdb{1..3}
##-C 创建磁盘阵列 ##-a 如果文件不存在则自动创建 ##-l 磁盘阵列level（raid 0，1，5）
##-n 设备个数 ##-x 闲置设备个数
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store ‘/boot‘ on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=http://www.mamicode.com/0.90
Continue creating array?
Continue creating array? (y/n) y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@desktop19 ~]# mkfs.xfs /dev/md0
meta-data=http://www.mamicode.com/dev/md0 isize=256 agcount=4, agsize=6392 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=25568, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime = none extsz=4096 blocks=0, rtextents=0
[root@desktop19 ~]# mount /dev/md0 /mnt/
2.删除磁盘阵列
（1）.破坏md0中的vdb1，2--->删除md0中的vdb1，2---->注意：剩下最后一个vdb3只能用（2）之后的步骤来删除了
[root@desktop19 ~]# mdadm -f /dev/md0 /dev/vdb1 ##-f（faulty） 破坏md0的vdb1
[root@desktop19 ~]# mdadm -D /dev/md0 ##-D 显示md0的使用情况
/dev/md0:
Version : 1.2
Creation Time : Sat Nov 5 22:59:22 2016
Raid Level : raid1
Array Size : 102272 (99.89 MiB 104.73 MB)
Used Dev Size : 102272 (99.89 MiB 104.73 MB)
Raid Devices : 2
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Sat Nov 5 23:32:37 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 1
Spare Devices : 0
Name : desktop19.example.com:0 (local to host desktop19.example.com)
UUID : 111646c2:8aa85c7a:c5f0b2c6:23a93cdc
Events : 36
Number Major Minor RaidDevice State
2 253 19 0 active sync /dev/vdb3
1 253 18 1 active sync /dev/vdb2
0 253 17 - faulty /dev/vdb1
[root@desktop19 ~]# mdadm -r /dev/md0 /dev/vdb1 ##-r（remove） 删除md0中的vdb1
[root@desktop19 ~]# mdadm -D /dev/md0
Number Major Minor RaidDevice State
2 253 19 0 active sync /dev/vdb3
1 253 18 1 active sync /dev/vdb2
（补充：
[root@desktop19 ~]# mdadm -a /dev/md0 /dev/vdb1 ##-a（add） 添加vdb1到md0
[root@desktop19 ~]# mdadm -D /dev/md0
Number Major Minor RaidDevice State
2 253 19 0 active sync /dev/vdb3
1 253 18 1 active sync /dev/vdb2
3 253 17 - spare /dev/vdb1
）
[root@desktop19 ~]# mdadm -f /dev/md0 /dev/vdb3
mdadm: set device faulty failed for /dev/vdb3: Device or resource busy
##当破坏到vdb3的时候报错，只能使用以下步骤来继续删除
（2）.卸载md0
[root@desktop19 ~]# umount /mnt/
（3）.停止磁盘阵列md0
[root@desktop19 ~]# mdadm -S /dev/md0
mdadm: stopped /dev/md0
（4）.依次删除磁盘阵列所用的磁盘
[root@desktop19 ~]# fdisk /dev/vdb
Command (m for help): d ##删除分区
Partition number (1-3, default 3):
Command (m for help): p ##显示该磁盘分区
Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 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: 0x27721115
Device Boot Start End Blocks Id System
Command (m for help): wq ##保存退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@desktop19 ~]# partprobe ##注意：做完之后不要忘记同步分区表
###########6.配额#############
超出的限额会在7天后清除。
注意：配额是针对于分区的，只在该分区里生效。是该用户在该分区下的限额。
西部开源学习笔记BOOK2-《unit 4》