If you are clustering with DRBD, Corosync, Pacemaker When the timing of systemd package update and corosync health check collide, The status of the target service (MySQL, etc.) may disappear and system switching may occur.
If the two processes do not collide, the update will end normally, so It doesn't seem to happen all the time.
That said, it's dangerous, so if you're running yum update on a regular basis, you might want to remove it. /usr/bin/yum update -y --exclude=systemd* Such.
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