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What the Managed installer changes on the host

  • Explanation
  • 1-min read

The Managed installer sets up the components of a Managed Cluster and changes operating system settings and system files on the host. Knowing these changes helps you review the effect of the installation before you run it.

Components the installer sets up

A Managed Cluster is a set of specialized components that work together to host your monitoring environment and process-monitoring data.

The installer sets up the following components in the installation directory (by default, /opt/dynatrace-managed):

  • Pre-configured Java Runtime Environment (your operating system settings aren't affected by this). Not visible in your alternatives options.
  • Cassandra-based Hypercube storage
  • Elasticsearch-based search engine
  • Dynatrace Server
  • An embedded ActiveGate

Operating system settings the installer changes

The installer also optimizes the following operating system settings:

  • The installer turns off swap (with swapoff). Turning on swap can result in undesired behavior, so it isn't supported.
  • The installer enhances iptables "PREROUTING" rules to forward HTTPS communication on port 443 to NGINX on port 8022. To see the exact rules, enter iptables -L -vt nat in your terminal.
  • The installer sets the readahead page cache to 512.
  • The installer changes limits for users globally (unlimited locked-in-memory address space, unlimited address space, increased limit for number of processes and open files). See /etc/security/limits.conf for details.
  • The installer modifies max_map_count.

System files the installer can modify

The installer may modify the following system files and directories during installation of Dynatrace Managed:

  • /etc/hosts
  • /etc/sysctl.conf
  • /etc/pam.d/su
  • /etc/rc.local
  • /etc/security/limits.conf
  • /etc/security/limits.d/90-nproc.conf
  • /etc/sudoers
  • /etc/sudoers.d/
  • /etc/init.d/
  • /etc/init.d/rc*.d/
  • /etc/systemd/system/

Related topics

  • Install a Managed Cluster