What should I do if the docker image is missing?

Solutions to the missing docker image: 1. Add hard disk space to root; 2. Divide space from home to root; 3. Back up data; 4. Unmount; 5. Create 1.8t "lv home"; 6. Mount and restore the data.

The operating environment of this article: centOS6.8 system, Docker version 18.09.x, Dell G3 computer.

What should I do if the docker image disappears?

Docker images mirror disappears solution

50,93 there is a situation where the mirror disappears

[root@h50 /]# df -h
文件系统             容量  已用  可用 已用% 挂载点
devtmpfs              24G     0   24G    0% /dev
tmpfs                 24G     0   24G    0% /dev/shm
tmpfs                 24G  428M   24G    2% /run
tmpfs                 24G     0   24G    0% /sys/fs/cgroup
/dev/mapper/cl-root   50G   43G  8.0G   85% /

The remaining 85% of root

overlay 50G 43G 8.0G 85% /var/lib/docker/overlay2/9e1d9bbd368c8ebafde39dcaaa66afecde95bfab7db51b13fe92aa5c7995cc9e/merged

The mirror uses the space under root

cat /var/lib/kubelet/config.yaml
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%

If less than 15% of imagesfs is evicted, eviction will occur.

It should be followed by This is related

Try to add hard disk space for root, divide the space from home to root

Add 7 t space on 93

Add space for root on lv

resize2fs /dev/mapper/centos-root 发生错误
xfs_growfs /dev/mapper/centos-root

Data backup

scp -r /home/ root@10.10.108.93:/root/home50/*

Unmount

umount -l /home
lvextend -L +80g /dev/centos/root

Need to update xfs after adding

xfs_growfs /dev/mapper/centos-root

Unable to mount and need to be repaired

xfs_repair /dev/cl/home

Due to the long repair time of several T

Delete lv home

lvremove /dev/centos/home

Create 1.8t lv home

lvcreate -n home -L 1.9T /dev/centos

Format to xfs system

mkfs.xfs /dev/centos/home

hang Load

mount /dev/mapper/centos-home /home

Restore data back

Increase home size

lvextend -L +1.8t /dev/centos/home
xfs_growfs /dev/mapper/cl-home

Restore home size at this time

Restore data back

scp -r root@10.10.108.93:/root/home52/* /home/

2. Reduce

xfs does not support reduction. lvreduce cannot be used, but resize2fs cannot be used. An error will be reported: Couldn't find valid filesystem superblock. This means that the reduced logical partition needs to be reformatted through the mkfs.

Pay attention to the boot mount

cat /etc/fstab
60上
lvreduce -L 5t /dev/centos/home
lvextend -L +1.8t /dev/centos/root
xfs_growfs /dev/mapper/centos-home

Recommended learning: "

docker video tutorial

"

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