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Placement Groups (Cluster (Can span VPCs, Best idea is to start all…
Placement Groups
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Partition
In between Cluster and Spread, it has a groups of clusters spread across.
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Placement Grps are themselves not tied to an AZ, but first instance boot ties it down to AZ
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Certain Instances are not allowed to be part of PG, also Mixing is allowed but not recommended
VPC
CIDR
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When u have the CIDR with RFC 1918 addressed, additional CIDRs cannot be RFC1918
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Tenanancy Mode needs to be specified during VPC creation, this is for Isolation