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A comment on What’s New in Docker 1.13?. Parent comment

Re:What’s New in Docker 1.13? by hyperknot on Friday January 20, 2017 @07:06AM (#13443198)
Yes, and especially for tools like PostgreSQL which uses features of the Linux filesystems which Docker simply didn't implement or implemented in a buggy way. My only solution was to use data volumes for PGSQL mounts, which at least provide native ext4 experience and compatibility but then you loose the directory sharing part.
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Re:What’s New in Docker 1.13? by dekz on Friday January 20, 2017 @07:10AM (#13443217)
What was your use case where you needed pgdata in both the HOST and a container (or multiple)?
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Re:What’s New in Docker 1.13? by hyperknot on Friday January 20, 2017 @07:20AM (#13443257)
Simply just backup it up. There is no way to back up Docker volumes, except for making an other container only for this purpose which runs rsync or something similar.
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