(Docker notes): data volume container

Data volume container

• Data synchronization between containers

• As shown above, use the parent container to share data with other containers

Case

• Start two containers docker01 and docker02 through the previously generated image

• Start docker02

docker run -it --name docker02 --volumes-from docker01 centos:1.0

• Create files in docker01 data volume

• View in docker02 data volume volume01

• Delete docker01, the shared data in docker02 is still there

• Bidirectional copy of shared volume of container

• Multiple mysql realize data sharing

docker run -d -p 3310:3306 -v /home/mysql/conf:/etc/mysql/conf.d \
-v /home/mysql/data:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=123456 --name mysql01 mysql:5.7

docker run -d -p 3310:3306 -e MYSQL_ROOT_PASSWORD=123456 \
--name mysql02 --volumes-from mysql01 mysql:5.7

• in conclusion:
  • The transfer of configuration information between containers, the life cycle of the data volume container continues until there is no container in use.
  • But once you persist it locally, the local data will not be deleted at this time.