Get access credentials.
Figure out current owners of servers. Your scope in handling those servers.
Details of service running on each physical server. ( check by ps -eaf command). Get details of service running. There configuration files. Purpose.
architecture of application if running on multiple servers. Where is Database. Middle ware, Where is application running, Storage for that application.
Details of configuration files in use.
Network configuration ( IP address - iptables if running), check routes. Check all interface connected. VLAN information.
Details of backup. How they are being taken, Backup Schedule. Backup tool in use.
VERY IMPORTANT -- Try to deploy application or tool with same configuration on test environment to get total control, else iyou will always be lost.
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