What should I do if the docker folder mapping fails?

What should I do if the docker folder mapping fails?

How to solve the problem of unsuccessful docker folder mapping:

Docker container does not keep any data
Please use external volume storage for important data (data persistence ization)
Containers can mount real machine directories or shared storage as volumes

1. Host volume mapping

[root@docker1 ~]# mkdir /var/data
[root@docker1 ~]# docker run -it -v /var/data:/abc myos
[root@f1fb58b85671 /]# cd /abc/
[root@f1fb58b85671 abc]# touch f1
[root@f1fb58b85671 abc]# ls
f1  zhy
[root@docker1 ~]# cd /var/data/
[root@docker1 data]# ls
f1
[root@docker1 data]# touch zhy

2. Use shared storage Mapping

Idea: Use one host as an nfs host, create the corresponding folder, and share it with two docker hosts. The two docker hosts will map the shared folder to In the container, the corresponding container can share the content of the nfs host. You can use this form for the corresponding page folders of http and other servers, so that multiple containers can run one business.

nfs主机配置【192.168.6.77】
[root@nfs ~]# yum -y install nfs-utils
[root@nfs ~]# vim /etc/exports
/public  *(rw)
[root@nfs ~]# systemctl restart nfs-server
Failed to restart nfs-serve.service: Unit not found
[root@nfs ~]# mkdir /public
[root@nfs ~]# cd /public/
[root@nfs public]# touch nfs.txt
[root@nfs public]# ls
nfs.txt
docker1主机配置
[root@docker1 ~]# vim /etc/fstab 
192.168.6.77:/public /mnt/nfs nfs defaults,_netdev 0 0
[root@docker1 ~]# mkdir  /mnt/nfs 
[root@docker1 ~]# systemctl restart nfs-server
[root@docker1 ~]# mount -a
[root@docker1 ~]# df -h
192.168.6.77:/public   17G  3.2G   14G   19% /mnt/nfs
[root@docker1 ~]# docker run -it -v /mnt/nfs/:/zhuhaiyan 192.168.6.153:5000/myos
[root@c7c376e3755a /]# cd /zhuhaiyan 
[root@c7c376e3755a zhuhaiyan]# ls
nfs.txt
docker2主机配置
[root@docker2 ~]# vim /etc/fstab 
192.168.6.77:/public /mnt/nfs nfs defaults,_netdev 0 0
[root@docker2 ~]# mkdir  /mnt/nfs 
[root@docker2 ~]# systemctl restart nfs-server
[root@docker2 ~]# mount -a
[root@docker2 ~]# df -h
192.168.6.77:/public   17G  3.2G   14G   19% /mnt/nfs
[root@docker2 ~]# docker run -it -v /mnt/nfs/:/zhuhaiyan 192.168.6.153:5000/myos
[root@cdd805771d07 /]# cd /zhuhaiyan/
[root@cdd805771d07 zhuhaiyan]# ls
nfs.txt

Recommended tutorial: "docker video tutorial"

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