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RHUI で NFS ストレージを安全にアンマウントする手順

Solution In Progress - Updated -

Issue

RHUA または CDS ノードで NFS ストレージ (/var/lib/rhui/remote_share) をアンマウントしようとすると、以下に示すように "device is busy" というエラーが発生して失敗します。

# umount -f /var/lib/rhui/remote_share
umount.nfs4: /var/lib/rhui/remote_share: device is busy


# fuser -muv /var/lib/rhui/remote_share
                     USER        PID ACCESS COMMAND
/var/lib/rhui/remote_share:
                     root     kernel mount (root)/var/lib/rhui/remote_share
                     pulp       1251 ..c.. (pulp)pulpcore-worker
                     pulp       1253 ..c.. (pulp)pulpcore-worker
                     pulp       1255 ..c.. (pulp)pulpcore-worker
                     pulp       1261 ..c.. (pulp)pulpcore-worker
                     pulp       1262 ..c.. (pulp)pulpcore-worker
                     pulp       1263 ..c.. (pulp)pulpcore-worker
                     pulp       1264 ..c.. (pulp)pulpcore-worker
                     pulp       1267 ..c.. (pulp)pulpcore-worker
                     pulp       2859 ..c.. (pulp)gunicorn
                     pulp       3330 ..c.. (pulp)gunicorn

Environment

Red Hat Update Infrastructure 4
Red Hat Update Infrastructure 5

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