How to Upgrade PostgreSQL in Docker and Kubernetes

升级的时候需要关注是否需要数据迁移，下文提供了一些迁移可能用到的方法

https://www.cloudytuts.com/tutorials/docker/how-to-upgrade-postgresql-in-docker-and-kubernetes/

backup

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docker exec -it eddc550220ed /usr/bin/pg_dumpall -U postgres > dumpfile

import

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docker exec -it [new-postgres-container] psql -U [username] < dumpfile