Confined sysadm or staff users cannot administer PostgreSQL database

Solution Verified - Updated -

Issue

  • On systems having the users confined (e.g. mapped to staff_u or sysadm_u), power users (e.g. users in wheel group) cannot execute sudo su - postgres to administer the PostgreSQL database

    $ id -Z
staff_u:staff_r:staff_t:s0-s0:c0.c1023

$ sudo su - postgres
[...]
su: warning: cannot change directory to /var/lib/pgsql: Permission denied

Environment

  • Red Hat Enterprise Linux 7 (RHEL7) and later
    • confined users
    • postgreSQL

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