Docker: fix uid/gid of the clickhouse user #19096
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Explicitly set uid / gid of clickhouse user & group to the fixed values 101. It is especially important for rootless containers: in that case entrypoint can't do chown and owners of mounted volumes should be configured externally. We do that in advance at the begining of Dockerfile before any packages will be installed to prevent picking those uid / gid by some unrelated software. The same uid / gid (101) is used both for alpine and ubuntu. Number 101 is used by default in openshift, and was used by all clickhouse-server docker images before 20.10. In 20.11 it was changed (by accident) to 999.
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Backport #19096 to 21.1: Docker: fix uid/gid of the clickhouse user
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Backport #19096 to 20.11: Docker: fix uid/gid of the clickhouse user
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Backport #19096 to 20.12: Docker: fix uid/gid of the clickhouse user
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Explicitly set uid / gid of clickhouse user & group to the fixed values (101) in clickhouse-server images.
Detailed description / Documentation draft:
Explicitly set uid / gid of clickhouse user & group to the fixed values 101.
It is especially important for rootless containers: in that case entrypoint can't do chown and owners of mounted volumes should be configured externally.
We do that in advance at the begining of Dockerfile before any packages will be installed to prevent picking those uid / gid by some unrelated software.
The same uid / gid (101) is used both for alpine and ubuntu.
Number 101 is used by default in openshift, and was used by all clickhouse-server docker images <= 20.10. In 20.11 it was changed (by accident) to 999.
PS. IMHO should be backported to >= 20.11.