LVM管理以及docker btrfs配置

時間  2019-12-11
標籤 lvm 管理 以及 docker btrfs 配置 欄目 Linux 简体版
原文   原文鏈接

lvdisplaynode

vgdisplaylinux

lvcreate -L 100G centosdocker

  Volume group "centos" has insufficient free space (1 extents): 25600 required.centos

 

 

lvcreate -L 100G -n docker-btr centos架構

--------------------------------------------------app

https://wiki.zentyal.org/wiki/Resize_Root_LVM_Partitionless

http://unix.stackexchange.com/questions/163969/resize-root-lvm-and-fs-in-debian-7ide

---------------------------------------------------ui

https://docs.docker.com/engine/userguide/storagedriver/btrfs-driver/this

 

mkfs.btrfs -f /dev/centos/docker-btr

--------------------------------------

https://access.redhat.com/articles/1196333

 

~]# umount /dev/vdb1

 

 

~]# e2fsck -f /dev/vdb1
e2fsck 1.41.12 (17-May-2010)
Pass 1:Checking inodes, blocks, and sizes
Pass 2:Checking directory structure
Pass 3:Checking directory connectivity
Pass 4:Checking reference counts
Pass 5:Checking group sumary information
ext4-1:11/131072 files (0.0% non-contiguous),27050/524128 blocks

 

 

~]# resize2fs /dev/vdb1 200M
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vdb1 to 204800 (1k) blocks.
The filesystem /dev/vdb1 is now 204800 blocks long.

 

 

~]# 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.

Command (m for help):

 

------

Command (m for help): n

Partition type:
  p  primary (1 primary, 0 extended, 3 free)
  e  extended
Select (default p): *Enter*

Using default response p.
Partition number (2-4, default 2): *Enter*
First sector (1026048-854745087, default 1026048): *Enter*
Last sector, +sectors or +size{K,M,G,T,P} (1026048-854745087, default 854745087): +500M

Created a new partition 2 of type 'Linux' and of size 500 MiB.

 

------

Command (m for help): p
Disk /dev/vda: 407.6 GiB, 437629485056 bytes, 854745088 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xf6e2b6cb

Device                       Boot    Start      End Blocks   Id System
/dev/vda1                    2048   1026047      512000      83 Linux
/dev/vda2                  1026048  2050047      512000      83 Linux

-------

Write the changes with the w option when you are sure they are correct

 

------------------------------------------------------------------------------------------------

Install parted 3.2

wget http://ftp.gnu.org/gnu/parted/parted-3.2.tar.xz

tar -xvf parted-3.2.tar.xz

cd parted-3.2

sudo yum install  -y libuuid-devel device-mapper-devel termcap-devel

./configure --without-readline

make

make install

-----------------------

/usr/local/sbin/parted /dev/sdb

resizepart 1 5T
mkpart primary btrfs 6000GB 7000GB
 
mkfs.btrfs -f /dev/sdb2

mkdir -p /data/btrfs/docker

[root@WUSHUU-KAFKA docker]# blkid /dev/sdb2
/dev/sdb2: UUID="421caab3-b9e9-4572-adcd-3f741eb33411" UUID_SUB="80d62d39-3a49-4e6e-9a17-0f47c09bdf91" TYPE="btrfs" PARTLABEL="primary" PARTUUID="39a502b7-1253-45be-9358-17624b23f275"

 

add to /etc/fstab

/dev/sdb2 /data/btrfs/docker btrfs defaults 0 0
UUID="421caab3-b9e9-4572-adcd-3f741eb33411" /data/btrfs/docker btrfs defaults 0 0 

 

add --storage-driver=btrfs to docker start script

 

 

 

----------------------------------------

 

 

https://blog.shadypixel.com/how-to-shrink-an-lvm-volume-safely/

 

 

 

 

stop emu-kvm

-----------

virsh list --all

virsh shutdown Police

 

 

－－－－－－－－－

resize lvm partition

－－－－－－－－－

 

  1. unmount the file system for reducing.
  2. Check the file system after unmount.
  3. Reduce the file system.
  4. Reduce the Logical Volume size than Current size.
  5. Recheck the file system for error.
  6. Remount the file-system back to stage.

 

umount /dev/mapper/centos-data

e2fsck -f /dev/mapper/centos-data

resize2fs /dev/mapper/centos-data 1000G

lvreduce -L 1000G /dev/mapper/centos-data

 

 

create docker btrfs

------------------

lvcreate -L 1000G -n docker-btr centos

mkfs.btrfs -f /dev/mapper/centos-docker--btr

[root@WUSHUU-KAFKA centos]# blkid /dev/mapper/centos-docker--btr

/dev/mapper/centos-docker--btr: UUID="94fd4ac3-58c6-4448-93eb-1bbb7ad8fc32" UUID_SUB="fdfd4893-076e-42c3-bfcb-fd927e6201b7" TYPE=「btrfs」

 

echo -e "/dev/mapper/centos-docker--btr /var/lib/docker btrfs defaults 0 0 \nUUID=\"94fd4ac3-58c6-4448-93eb-1bbb7ad8fc32\" /var/lib/docker btrfs defaults 0 0" >>/etc/fstab

mount -a

================================================================================

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                ymunkB-9D3Z-jrWt-aEwi-Ertw-zqnM-ZHCBJg
  LV Write Access        read/write
  LV Creation host, time localhost, 2016-09-06 17:53:33 +0800
  LV Status              available
  # open                 2
  LV Size                11.81 GiB
  Current LE             3024
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/centos/home
  LV Name                home
  VG Name                centos
  LV UUID                YNVcCh-cR6r-3eAB-yMDc-5fre-LcJM-YhbEPD
  LV Write Access        read/write
  LV Creation host, time localhost, 2016-09-06 17:53:33 +0800
  LV Status              available
  # open                 1
  LV Size                216.51 GiB
  Current LE             55426
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
   
  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                pDpa2u-mpTV-T51N-gFZ8-JfzL-O9qO-XOlfo7
  LV Write Access        read/write
  LV Creation host, time localhost, 2016-09-06 17:53:36 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

--------------------------------------------------------------------------------------------------------

[root@localhost /]# yum install wget
已加載插件：fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.neusoft.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
正在解決依賴關係
--> 正在檢查事務
---> 軟件包 wget.x86_64.0.1.14-10.el7_0.1 將被 安裝
--> 解決依賴關係完成

依賴關係解決

=============================================================
 Package   架構        版本                  源         大小
=============================================================
正在安裝:
 wget      x86_64      1.14-10.el7_0.1       base      545 k

事務概要
=============================================================
安裝  1 軟件包

總下載量：545 k
安裝大小：2.0 M
Is this ok [y/d/N]: y

wget http://ftp.gnu.org/gnu/parted/parted-3.2.tar.xz

tar -xvf parted-3.2.tar.xz

cd parted-3.2

sudo yum install  -y libuuid-devel device-mapper-devel termcap-devel

./configure --without-readline

make

make install

 

[root@localhost parted-3.2]# fdisk -l

磁盤 /dev/sda：36 MB, 36700160 字節，71680 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節
磁盤標籤類型：dos
磁盤標識符：0x0008e13c

   設備 Boot      Start         End      Blocks   Id  System

磁盤 /dev/sdb：15 MB, 15000576 字節，29298 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節
磁盤標籤類型：dos
磁盤標識符：0x000a9276

   設備 Boot      Start         End      Blocks   Id  System

磁盤 /dev/sdc：299.4 GB, 299439751168 字節，584843264 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節
磁盤標籤類型：dos
磁盤標識符：0x0003c8da

   設備 Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        2048     1026047      512000   83  Linux
/dev/sdc2         1026048   584843263   291908608   8e  Linux LVM

磁盤 /dev/mapper/centos-root：53.7 GB, 53687091200 字節，104857600 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節


磁盤 /dev/mapper/centos-swap：12.7 GB, 12683575296 字節，24772608 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節


磁盤 /dev/mapper/centos-home：232.5 GB, 232473493504 字節，454049792 個扇區
Units = 扇區 of 1 * 512 = 512 bytes
扇區大小(邏輯/物理)：512 字節 / 512 字節
I/O 大小(最小/最佳)：512 字節 / 512 字節

===========================================================================

對於linux下的文件系統和邏輯卷管理的相關概念須要深刻理解，而且要對掛載文件系統的概念有個清晰的認識，這樣才能知道下面的文檔的用意所在，而且須要先創建docker的掛載路徑，而且將該掛載路徑掛載到相應的btrfs文件系統下，這樣才能夠按照下面的文檔中描述的那樣實現開機時的自動掛載，在進行了這個步驟以後，再進行docker 的安裝，就能夠實現docker info的信息的正確輸出。

b. Create an /etc/fstab entry to automatically mount /var/lib/docker each time the system boots. Either of the following lines will work, just remember to substitute the UUID value with the value obtained from the previous command.

/dev/xvdb /var/lib/docker btrfs defaults 0 0
UUID="a0ed851e-158b-4120-8416-c9b072c8cf47" /var/lib/docker btrfs defaults 0 0

如下是在系統分區所有準備完之後的主要的步驟，固然，也簡略的提到了創建文件系統的過程，對於那些不瞭解LVM以及linux下磁盤分區相關概念的小夥伴們，就應當多多參考一下這篇文章，這裏對於怎樣對linux的磁盤進行管理有詳細的介紹。

Configure Btrfs on Ubuntu 14.04 LTS

Assuming your system meets the prerequisites, do the following:

  1. Install the 「btrfs-tools」 package.

    $ sudo apt-get install btrfs-tools

Reading package lists... Done
Building dependency tree
<output truncated>

  2. Create the Btrfs storage pool.

    Btrfs storage pools are created with the mkfs.btrfs command. Passing multiple devices to the mkfs.btrfs command creates a pool across all of those devices. Here you create a pool with a single device at /dev/xvdb.

    $ sudo mkfs.btrfs -f /dev/xvdb

WARNING! - Btrfs v3.12 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

Turning ON incompat feature 'extref': increased hardlink limit per file to 65536
fs created label (null) on /dev/xvdb
    nodesize 16384 leafsize 16384 sectorsize 4096 size 4.00GiB
Btrfs v3.12

    Be sure to substitute /dev/xvdb with the appropriate device(s) on your system.

    Warning: Take note of the warning about Btrfs being experimental. As noted earlier, Btrfs is not currently recommended for production deployments unless you already have extensive experience.

  3. If it does not already exist, create a directory for the Docker host’s local storage area at/var/lib/docker.

    $ sudo mkdir /var/lib/docker

  4. Configure the system to automatically mount the Btrfs filesystem each time the system boots.

    a. Obtain the Btrfs filesystem’s UUID.

    $ sudo blkid /dev/xvdb

/dev/xvdb: UUID="a0ed851e-158b-4120-8416-c9b072c8cf47" UUID_SUB="c3927a64-4454-4eef-95c2-a7d44ac0cf27" TYPE="btrfs"

    b. Create an /etc/fstab entry to automatically mount /var/lib/docker each time the system boots. Either of the following lines will work, just remember to substitute the UUID value with the value obtained from the previous command.

    /dev/xvdb /var/lib/docker btrfs defaults 0 0
UUID="a0ed851e-158b-4120-8416-c9b072c8cf47" /var/lib/docker btrfs defaults 0 0

  5. Mount the new filesystem and verify the operation.

    $ sudo mount -a

$ mount

/dev/xvda1 on / type ext4 (rw,discard)
<output truncated>
/dev/xvdb on /var/lib/docker type btrfs (rw)

    The last line in the output above shows the /dev/xvdb mounted at /var/lib/dockeras Btrfs.

Now that you have a Btrfs filesystem mounted at /var/lib/docker, the daemon should automatically load with the btrfs storage driver.

  1. Start the Docker daemon.

    $ sudo service docker start

docker start/running, process 2315

    The procedure for starting the Docker daemon may differ depending on the Linux distribution you are using.

    You can force the Docker daemon to start with the btrfs storage driver by either passing the --storage-driver=btrfs flag to the docker daemon at startup, or adding it to the DOCKER_OPTS line to the Docker config file.

  2. Verify the storage driver with the docker info command.

    $ sudo docker info

Containers: 0
Images: 0
Storage Driver: btrfs
[...]

Your Docker host is now configured to use the btrfs storage driver.

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