Hello @DB_PPF, Thank you for your questions. For step 2b, you are free to use 6443 to further secure your ArcGIS Server site; enabling HTTP is not mandatory. For steps 4-10, these steps are performed on AWS instance A. Instance C will need to remain running, yes, as this instance is dedicated to serving as the ArcGIS Server site's file share. Instance C serves to host the configuration store, directories and log settings. So once the setup is complete, you will have instances A and B operating in a highly available ArcGIS Server site and both instances refer to instance C as the file path for the site's configuration store and directories.
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Hello Todd Remmel, You shouldn't have to modify the systemd in order for the limits to take into effect. Once you've modified the /etc/security/limits.conf as the root user, it is best practice to switch to the ArcGIS installation user. Should you log out of the root user, the changes may not necessarily take affect. To guarantee the changes done to /etc/security/limits.conf take affect, make sure you run command "su <arcgis_user>" to switch to the ArcGIS installation user, and then run ulimit -Hn -Hu; ulimit -Sn -Su. If that still does not work, exiting your remote session in your machine and starting a new session into that machine should pick up the newly set file handle limit and process limit. Additionally, please find the following documentation on ArcGIS Server's system requirements: ArcGIS Server 10.6.x system requirements—ArcGIS Enterprise system requirements | Documentation for ArcGIS Enterprise. CentOS 7.5 is the latest version of the OS tested against this version of the software. Should you continue to use CentOS 8, please be aware of this should you encounter any issues moving forward.
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