Docker鏡像、容器等文件目錄默認在系統盤，虛擬機分配的系統盤20G容量也太小，研究下系統盤擴容

linux 系統分區 /dev/sda3，創建新系統分區sda4，擴容20G

基本的邏輯卷管理概念

基本的邏輯卷管理概念：
PV（Physical Volume）- 物理卷
物理卷在邏輯卷管理中處于最底層，它可以是實際物理硬盤上的分區，也可以是整個物理硬盤，也可以是raid設備。
VG（Volumne Group）- 卷組
卷組建立在物理卷之上，一個卷組中至少要包括一個物理卷，在卷組建立之后可動態添加物理卷到卷組中。一個邏輯卷管理系統工程中可以只有一個卷組，也可以擁有多個卷組。
LV（Logical Volume）- 邏輯卷
邏輯卷建立在卷組之上，卷組中的未分配空間可以用于建立新的邏輯卷，邏輯卷建立后可以動態地擴展和縮小空間。系統中的多個邏輯卷可以屬于同一個卷組，也可以屬于不同的多個卷組。

在虛擬機分配20G硬盤

略

系統加盤sda4

[root@node1 ~]# fdisk /dev/sda 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 (20971520-62914559, default 20971520): Using default value 20971520 Last sector, +sectors or +size{K,M,G} (20971520-62914559, default 62914559): Using default value 62914559 Partition 4 of type Linux and of size 20 GiB is setCommand (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.

加入sda4

[root@node1 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 30G 0 disk ├─sda1 8:1 0 300M 0 part /boot ├─sda2 8:2 0 1G 0 part ├─sda3 8:3 0 8.7G 0 part / └─sda4 8:4 0 20G 0 part sr0 11:0 1 1024M 0 rom

創建物理卷

[root@node1 ~]# pvcreate /dev/sda4Physical volume "/dev/sda4" successfully created.查看物理卷 [root@node1 ~]# pvsPV VG Fmt Attr PSize PFree /dev/sda4 lvm2 --- 20.00g 20.00g[root@node1 ~]# pvdisplay"/dev/sda4" is a new physical volume of "20.00 GiB"--- NEW Physical volume ---PV Name /dev/sda4VG Name PV Size 20.00 GiBAllocatable NOPE Size 0 Total PE 0Free PE 0Allocated PE 0PV UUID dnbfor-Mftv-L8o5-gdbP-sVdj-H6HY-tHW4J8[root@node1 ~]# partprobe

創建卷組

[root@node1 ~]# vgcreate vg0 /dev/sda4Volume group "vg0" successfully created#查看卷組 [root@node1 ~]# vgscanReading volume groups from cache.Found volume group "vg0" using metadata type lvm2[root@node1 ~]# vgextend vg0 /dev/sda6 #增加一個卷組 [root@node1 ~]# pvmove /dev/sda6 //移走PV的數據 [root@node1 ~]# vgreduce vg0 /dev/sda6 //從vg0中刪除物理卷

創建邏輯卷（單位:M）

[root@node1 ~]# lvcreate -L 10G -n lv1 vg0Logical volume "lv1" created.[root@node1 /]# lvscanACTIVE '/dev/vg0/lv1' [10.00 GiB] inherit [root@node1 ~]# lvdisplay--- Logical volume ---LV Path /dev/vg0/lv1LV Name lv1VG Name vg0LV UUID o9Qy20-I08o-GtAK-v0y9-DuY5-QlYl-J63IWcLV Write Access read/writeLV Creation host, time node1, 2021-03-28 21:40:00 +0800LV Status available# open 0LV Size 10.00 GiBCurrent LE 2560Segments 1Allocation inheritRead ahead sectors auto- currently set to 8192Block device 253:0

建文件系統（格式化）

[root@node1 ~]# mkfs -t xfs /dev/vg0/lv1 meta-data=/dev/vg0/lv1 isize=512 agcount=4, agsize=655360 blks= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=2621440, imaxpct=25= sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=2560, version=2= sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0

掛載邏輯卷

[root@node1 ~]# mount /dev/vg0/lv1 /home[root@node1 ~]# df -h #擴容前10G Filesystem Size Used Avail Use% Mounted on /dev/sda3 8.7G 3.3G 5.5G 38% / /dev/sda1 297M 118M 180M 40% /boot /dev/mapper/vg0-lv1 10G 33M 10G 1% /home tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup-------------------------------------------------------------------------------- 為根分區擴展空間 [root@node1 ~]# lvextend -L +1G /dev/mapper/vg0-lv1 [root@node1 ~]# resize2fs -f /dev/mapper/vg0-lv1 #不生效使用下面-------------------------------------------------------------------------------- [root@node1 ~]# xfs_growfs /dev/mapper/vg0-lv1 meta-data=/dev/mapper/vg0-lv1 isize=512 agcount=4, agsize=655360 blks= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=2621440, imaxpct=25= sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=2560, version=2= sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 2621440 to 4507648-------------------------------------------------------------------------------- [root@node1 ~]# df -h #擴容后18G Filesystem Size Used Avail Use% Mounted on /dev/sda3 8.7G 3.3G 5.5G 38% / devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 297M 118M 180M 40% /boot /dev/mapper/vg0-lv1 18G 33M 18G 1% /home

完

修改docker默認目錄（終極大招）

修改docker默認目錄到/home/docker下
Docker鏡像、容器等文件目錄遷移
https://blog.csdn.net/halikes23/article/details/87269997

[root@node1 ~]# systemctl stop docker[root@node1 ~]# mkdir /home/docker[root@node1 ~]# cp -R /var/lib/docker/* /home/docker/[root@node1 ~]# cat /etc/docker/daemon.json {"registry-mirrors": ["https://17tjx23n.mirror.aliyuncs.com"],"exec-opts": ["native.cgroupdriver=systemd"],"graph": "/home/docker" #添加新目錄 } [root@node1 ~]# systemctl daemon-reload && systemctl start docker[root@node1 ~]# ln -s /usr/libexec/docker/docker-runc-current docker-runc刪除原有文件 [root@node1 ~]# rm -rf /var/lib/docker

雖然沒有用刪除操作，但是看到/var/lib/docker目錄已經不存在了，鏡像與容器顯示在了新的目錄/home/docker中

[root@node1 ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on /dev/sda3 xfs 8.7G 2.7G 6.1G 31% / devtmpfs devtmpfs 1.4G 0 1.4G 0% /dev tmpfs tmpfs 1.4G 0 1.4G 0% /dev/shm tmpfs tmpfs 1.4G 9.3M 1.4G 1% /run tmpfs tmpfs 1.4G 0 1.4G 0% /sys/fs/cgroup /dev/sda1 xfs 297M 118M 180M 40% /boot /dev/mapper/vg0-lv1 xfs 20G 831M 20G 5% /home tmpfs tmpfs 1.4G 12K 1.4G 1% /var/lib/kubelet/pods/9bb01287-42bd-4d81-9e24-4fd1b2953df1/volumes/kubernetes.io~secret/default-token-2l58c tmpfs tmpfs 1.4G 12K 1.4G 1% /var/lib/kubelet/pods/dcbaf00d-64f2-4c41-8d94-78e919a84db3/volumes/kubernetes.io~secret/flannel-token-k794f tmpfs tmpfs 1.4G 12K 1.4G 1% /var/lib/kubelet/pods/9e616d2b-6328-4edf-bf03-8666fb094871/volumes/kubernetes.io~secret/kube-proxy-token-78wp7 tmpfs tmpfs 284M 0 284M 0% /run/user/0 overlay overlay 20G 831M 20G 5% /home/docker/overlay2/136ee7e8387889f29b5d8b348d6efbad849d8c961fa65eb3d0777a002daac01b/merged overlay overlay 20G 831M 20G 5% /home/docker/overlay2/0ae46f788b0344c898b2b05c00ad644e5abc2d5629048b76393bf53e93bc5173/merged overlay overlay 20G 831M 20G 5% /home/docker/overlay2/c9fdd6a853ebb74d6aa5d6a7116b57ba4152c9ae6fcd50c1e5c75198961a49ba/merged shm tmpfs 64M 0 64M 0% /home/docker/containers/3f778588c1026b13831ca20b83ebb2049660ed2d275ad869cace012b1322bea8/mounts/shm shm tmpfs 64M 0 64M 0% /home/docker/containers/334ed06000ed551253d46f7fb93fe96ff3fbd7a1beddc9f6dbbf83228dce6b1b/mounts/shm shm tmpfs 64M 0 64M 0% /home/docker/containers/b8644ce2df31395ca9d985cf1c27ed000ee0aff164d0b9bad33738d261e47094/mounts/shm overlay overlay 20G 831M 20G 5% /home/docker/overlay2/a4723f525ef18097008ca12f6dad08c40a93a240c4fbf3c278333a70ca14634f/merged overlay overlay 20G 831M 20G 5% /home/docker/overlay2/4fa16c90c3201c2766dd99b2aa0153f9d7827e57869e1d07b307ab24afa0e7c3/merged overlay overlay 20G 831M 20G 5% /home/docker/overlay2/746c68cd3386c7f246439bc7cfb1a1f13171b83b8596d6e907c7147bcf88d159/merged

參考資料

Linux虛擬機 sda分區擴容
https://blog.csdn.net/liuweijin_hot/article/details/105082645

centos7 -lvm卷組
http://t.zoukankan.com/jjp816-p-8917027.html

邏輯卷的使用
https://blog.51cto.com/9480860/1700288

linux如何使用umount命令強制卸載文件系統
https://blog.csdn.net/qq_19175749/article/details/51154529

Docker鏡像、容器等文件目錄遷移
https://blog.csdn.net/halikes23/article/details/87269997

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