day22

[root@oldboyedu ~]# parted /dev/sdb #交互式分區(qū)
GNU Parted 3.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) help
(parted) mklabel gpt #修改分區(qū)格式為gpt
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to
continue?
Yes/No? Yes
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt #修改結(jié)果
(parted) mkpart primary 0 480 #創(chuàng)建第一個(gè)主分區(qū)480M谷暮。
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? Ignore #忽略提示声搁。
(parted) mkpart primary 481 580 #創(chuàng)建第二個(gè)主分區(qū)100M刽漂。
Warning: You requested a partition from 481MB to 580MB (sectors 939453..1132812).
The closest location we can manage is 481MB to 481MB (sectors 940031..940031).
Is this still acceptable to you?
Yes/No? Y
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? I #忽略提示。
(parted) mkpart logic 581 600 #創(chuàng)建一個(gè)20M邏輯分區(qū)芹枷。
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 17.4kB 480MB 480MB primary
3 481MB 481MB 512B primary
2 481MB 580MB 98.6MB primary
4 581MB 600MB 18.9MB logic
(parted) rm 4 #刪除
(parted) p
分區(qū)被parted搞了。
修改分區(qū)格式:
(parted) mklabel msdos
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to
continue?
Yes/No? Y
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
創(chuàng)建分區(qū):
[root@oldboyedu ~]# fdisk /dev/sdb
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.
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 (2048-2097151, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151): +100M
Partition 1 of type Linux and of size 100 MiB is set
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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: 0x000006b6
Device Boot Start End Blocks Id System
/dev/sdb1 2048 206847 102400 83 Linux
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 (206848-2097151, default 206848):
Using default value 206848
Last sector, +sectors or +size{K,M,G} (206848-2097151, default 2097151): +100M
Partition 2 of type Linux and of size 100 MiB is set
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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: 0x000006b6
Device Boot Start End Blocks Id System
/dev/sdb1 2048 206847 102400 83 Linux
/dev/sdb2 206848 411647 102400 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@oldboyedu ~]# ls -l /dev/sdb*
brw-rw---- 1 root disk 8, 16 Mar 29 11:31 /dev/sdb
brw-rw---- 1 root disk 8, 17 Mar 29 11:31 /dev/sdb1
brw-rw---- 1 root disk 8, 18 Mar 29 11:31 /dev/sdb2
[root@oldboyedu ~]# mkfs -t ext4 /dev/sdb1 #格式化ext4文件系統(tǒng) mkfs.ext4
其實(shí)關(guān)鍵就是生成一定數(shù)量的Inode和Block莲趣。
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
25688 inodes, 102400 blocks
5120 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33685504
13 block groups
8192 blocks per group, 8192 fragments per group
1976 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
掛載: 開門鸳慈、開窗住人使用
[root@oldboyedu ~]# mount /dev/sdb1 /mnt #臨時(shí)掛載到/mnt
[root@oldboyedu ~]# df -h #查看掛載結(jié)果
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 19G 1.9G 18G 10% /
devtmpfs 980M 5.0M 975M 1% /dev
tmpfs 991M 0 991M 0% /dev/shm
tmpfs 991M 18M 973M 2% /run
tmpfs 991M 0 991M 0% /sys/fs/cgroup
/dev/sda1 253M 136M 118M 54% /boot
tmpfs 199M 0 199M 0% /run/user/0
tmpfs 199M 0 199M 0% /run/user/1000
/dev/sdb1 93M 1.6M 85M 2% /mnt #<====已掛載。
[root@oldboyedu ~]# cat /proc/mounts #查看掛載結(jié)果
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
/dev/sda3 / xfs rw,relatime,attr2,inode64,noquota 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=32,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=19277 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
/dev/sda1 /boot xfs rw,relatime,attr2,inode64,noquota 0 0
tmpfs /run/user/0 tmpfs rw,nosuid,nodev,relatime,size=202812k,mode=700 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=202812k,mode=700,uid=1000,gid=1000 0 0
/dev/sdb1 /mnt ext4 rw,relatime,data=ordered 0 0 #<==已掛載妖爷。
[root@oldboyedu ~]# touch /mnt/oldboy #<==測(cè)試蝶涩。
[root@oldboyedu ~]# ls /mnt
lost+found oldboy
[root@oldboyedu /mnt]# umount /mnt
umount: /mnt: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@oldboyedu /mnt]# pwd
/mnt
You have new mail in /var/spool/mail/root
[root@oldboyedu /mnt]# umount -lf /mnt #<==強(qiáng)制卸載
[root@oldboyedu /mnt]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 19G 1.9G 18G 10% /
devtmpfs 980M 5.0M 975M 1% /dev
tmpfs 991M 0 991M 0% /dev/shm
tmpfs 991M 18M 973M 2% /run
tmpfs 991M 0 991M 0% /sys/fs/cgroup
/dev/sda1 253M 136M 118M 54% /boot
tmpfs 199M 0 199M 0% /run/user/0
tmpfs 199M 0 199M 0% /run/user/1000
[root@oldboyedu ~]# mount /dev/sdb2 /opt #沒有格式化沒法掛載
mount: /dev/sdb2 is write-protected, mounting read-only
mount: unknown filesystem type '(null)'
[root@oldboyedu ~]# mkfs.xfs /dev/sdb2 #格式化xfs文件系統(tǒng)
meta-data=/dev/sdb2 isize=512 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=855, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@oldboyedu ~]# mount -t xfs /dev/sdb2 /opt
You have new mail in /var/spool/mail/root
[root@oldboyedu ~]# df -h|grep opt
/dev/sdb2 97M 5.3M 92M 6% /opt
[root@oldboyedu ~]# touch /opt/oldgirl
[root@oldboyedu ~]# ls /opt
oldgirl
如何開機(jī)自動(dòng)掛載理朋?
/etc/fstab 開機(jī)自動(dòng)掛載
幾列絮识? 6列
[root@oldboyedu ~]# cat /etc/fstab
UUID=3a3a295f-88f8-456d-94dc-1a3eeb517c02 / xfs defaults 0 0
UUID=fd2e0ca7-32be-425f-86a2-85c02b9ec5ea /boot xfs defaults 0 0
UUID=79a3924b-739e-48dc-ab0c-0444b9ac6591 swap swap defaults 0 0
設(shè)備 掛載點(diǎn) 文件系統(tǒng)類型 默認(rèn)掛載選項(xiàng) 是否備份 是否開機(jī)磁盤檢查
/dev/sdb2 /opt xfs defaults 0 0
mount -t xfs /dev/sdb2 /opt
[root@oldboyedu ~]# blkid
/dev/sdb1: UUID="a45b004f-2322-4dc4-a281-2a212dd2ab79" TYPE="ext4"
/dev/sdb2: UUID="7daf8142-b641-4b60-a287-4e08dfa18611" TYPE="xfs"
/dev/sda1: UUID="fd2e0ca7-32be-425f-86a2-85c02b9ec5ea" TYPE="xfs"
/dev/sda2: UUID="79a3924b-739e-48dc-ab0c-0444b9ac6591" TYPE="swap"
/dev/sda3: UUID="3a3a295f-88f8-456d-94dc-1a3eeb517c02" TYPE="xfs"
[root@oldboyedu ~]# tail -1 /etc/fstab
/dev/sdb2 /opt xfs defaults 0 0
mount -a 可以將fstab里的信息掛載。
放入/etc/rc.local 實(shí)現(xiàn)自動(dòng)掛載 但不推薦嗽上。
/sbin/mount -t xfs /dev/sdb2 /opt
查看:
[root@oldboyedu ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 19G 1.9G 18G 10% /
devtmpfs 980M 0 980M 0% /dev
tmpfs 991M 0 991M 0% /dev/shm
tmpfs 991M 9.6M 981M 1% /run
tmpfs 991M 0 991M 0% /sys/fs/cgroup
/dev/sdb2 97M 5.3M 92M 6% /opt
/dev/sda1 253M 136M 118M 54% /boot
tmpfs 199M 0 199M 0% /run/user/0
tmpfs 199M 0 199M 0% /run/user/1000
[root@oldboyedu ~]# df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sda3 9960960 74572 9886388 1% /
devtmpfs 250820 390 250430 1% /dev
tmpfs 253514 1 253513 1% /dev/shm
tmpfs 253514 724 252790 1% /run
tmpfs 253514 16 253498 1% /sys/fs/cgroup
/dev/sdb2 51200 4 51196 1% /opt
/dev/sda1 131072 332 130740 1% /boot
tmpfs 253514 1 253513 1% /run/user/0
tmpfs 253514 1 253513 1% /run/user/1000
[root@oldboyedu ~]# blkid
/dev/sdb1: UUID="a45b004f-2322-4dc4-a281-2a212dd2ab79" TYPE="ext4"
/dev/sdb2: UUID="7daf8142-b641-4b60-a287-4e08dfa18611" TYPE="xfs"
/dev/sda1: UUID="fd2e0ca7-32be-425f-86a2-85c02b9ec5ea" TYPE="xfs"
/dev/sda2: UUID="79a3924b-739e-48dc-ab0c-0444b9ac6591" TYPE="swap"
/dev/sda3: UUID="3a3a295f-88f8-456d-94dc-1a3eeb517c02" TYPE="xfs"
查看文件系統(tǒng)內(nèi)部細(xì)節(jié):
[root@oldboyedu ~]# dumpe2fs /dev/sdb1 #查看ext文件系統(tǒng)內(nèi)部細(xì)節(jié)
[root@oldboyedu ~]# dumpe2fs /dev/sdb1|egrep -i "size"
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize
Block size: 1024
Fragment size: 1024
Group descriptor size: 64
Flex block group size: 16
Inode size: 128
Journal size: 4096k
[root@oldboyedu ~]# xfs_
xfs_admin xfs_db xfs_fsr xfs_io xfs_metadump xfs_quota
xfs_bmap xfs_estimate xfs_growfs xfs_logprint xfs_mkfile xfs_repair
xfs_copy xfs_freeze xfs_info xfs_mdrestore xfs_ncheck xfs_rtcp
[root@oldboyedu ~]# xfs_
[root@oldboyedu ~]# xfs_info /dev/sda1
meta-data=/dev/sda1 isize=512 agcount=4, agsize=16384 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=65536, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=855, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@oldboyedu ~]# fsck
fsck fsck.btrfs fsck.cramfs fsck.ext2 fsck.ext3 fsck.ext4 fsck.minix fsck.xfs
[root@oldboyedu ~]# fsck
fsck 磁盤檢查和修復(fù)
1次舌、正常的磁盤不能操作。
2兽愤、卸載掛載點(diǎn)在操作
[root@oldboyedu ~]# fsck -a /dev/sdb1
fsck from util-linux 2.23.2
/dev/sdb1: clean, 12/25688 files, 8896/102400 blocks
[root@oldboyedu ~]# mount /dev/sdb1 /mnt
[root@oldboyedu ~]# fsck -a /dev/sdb1
fsck from util-linux 2.23.2
/dev/sdb1 is mounted.
e2fsck: Cannot continue, aborting.
[root@oldboyedu ~]# e2fsck /dev/sdb1
e2fsck 1.42.9 (28-Dec-2013)
/dev/sdb1: clean, 12/25688 files, 8896/102400 blocks
[root@oldboyedu ~]# fsck -a /dev/sdb1
fsck from util-linux 2.23.2
/dev/sdb1: clean, 12/25688 files, 8896/102400 blocks
[root@oldboyedu ~]# xfs_repair /dev/sdb2
xfs_repair: /dev/sdb2 contains a mounted filesystem
xfs_repair: /dev/sdb2 contains a mounted and writable filesystem
fatal error -- couldn't initialize XFS library
[root@oldboyedu ~]# umount /opt
[root@oldboyedu ~]# xfs_repair /dev/sdb2
Phase 1 - find and verify superblock...
Phase 2 - using internal log

  • zero log...
  • scan filesystem freespace and inode maps...
  • found root inode chunk
    Phase 3 - for each AG...
  • scan and clear agi unlinked lists...
  • process known inodes and perform inode discovery...
  • agno = 0
  • agno = 1
  • agno = 2
  • agno = 3
  • process newly discovered inodes...
    Phase 4 - check for duplicate blocks...
  • setting up duplicate extent list...
  • check for inodes claiming duplicate blocks...
  • agno = 0
  • agno = 1
  • agno = 2
  • agno = 3
    Phase 5 - rebuild AG headers and trees...
  • reset superblock...
    Phase 6 - check inode connectivity...
  • resetting contents of realtime bitmap and summary inodes
  • traversing filesystem ...
  • traversal finished ...
  • moving disconnected inodes to lost+found ...
    Phase 7 - verify and correct link counts...
    done
    ==============================指定塊大小和inode大小格式===========================================
    [root@oldboyedu ~]# mkfs -t ext4 -b 4096 -I 512 /dev/sdb3
    mke2fs 1.42.9 (28-Dec-2013)
    Filesystem label=
    OS type: Linux
    Block size=4096 (log=2)
    Fragment size=4096 (log=2)
    Stride=0 blocks, Stripe width=0 blocks
    38400 inodes, 38400 blocks
    1920 blocks (5.00%) reserved for the super user
    First data block=0
    Maximum filesystem blocks=39845888
    2 block groups
    32768 blocks per group, 32768 fragments per group
    19200 inodes per group
    Superblock backups stored on blocks:
    32768
    Allocating group tables: done
    Writing inode tables: done
    Creating journal (4096 blocks): done
    Writing superblocks and filesystem accounting information: done
    [root@oldboyedu ~]# dumpe2fs /dev/sdb3|egrep -i "size"
    dumpe2fs 1.42.9 (28-Dec-2013)
    Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
    Block size: 4096
    Fragment size: 4096
    Group descriptor size: 64
    Flex block group size: 16
    Inode size: 512
    Required extra isize: 28
    Desired extra isize: 28
    Journal size: 16M
    文件刪除原理
    no space left on device.
    swap作用彼念,內(nèi)存不夠時(shí)候,用來充當(dāng)內(nèi)存浅萧,一般內(nèi)存1.5倍逐沙。大于8G給8G
    將來JAVA服務(wù),內(nèi)存泄漏洼畅。吩案。。
    swap就會(huì)占用帝簇。徘郭。。操作系統(tǒng)性能下降
    [root@oldboyedu ~]# free -m
    total used free shared buff/cache available
    Mem: 1980 143 1689 9 146 1671
    Swap: 767 0 767
    增加swap分區(qū) 100M
    [root@oldboyedu ~]# fdisk /dev/sdb
    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.
    Command (m for help): n
    Partition type:
    p primary (3 primary, 0 extended, 1 free)
    e extended
    Select (default e): p
    Selected partition 4
    First sector (718848-2097151, default 718848):
    Using default value 718848
    Last sector, +sectors or +size{K,M,G} (718848-2097151, default 2097151): +150M
    Partition 4 of type Linux and of size 150 MiB is set
    Command (m for help): p
    Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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: 0x000006b6
    Device Boot Start End Blocks Id System
    /dev/sdb1 2048 206847 102400 83 Linux
    /dev/sdb2 206848 411647 102400 83 Linux
    /dev/sdb3 411648 718847 153600 83 Linux
    /dev/sdb4 718848 1026047 153600 83 Linux
    Command (m for help): w
    The partition table has been altered!
    Calling ioctl() to re-read partition table.
    WARNING: Re-reading the partition table failed with error 16: 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)
    Syncing disks.
    [root@oldboyedu ~]# partprobe /dev/sdb
    [root@oldboyedu ~]# mkswap /dev/sdb4
    Setting up swapspace version 1, size = 153596 KiB
    no label, UUID=2d1ac352-4cc0-4727-8318-5526a3c309c2
    [root@oldboyedu ~]# swapon -a /dev/sdb4
    You have new mail in /var/spool/mail/root
    [root@oldboyedu ~]# free -m
    total used free shared buff/cache available
    Mem: 1980 144 1673 19 162 1658
    Swap: 917 0 917
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