Set up a cluster

Setting up your Managed cluster involves creating your first cluster node by downloading and installing Dynatrace Managed. To set up your Managed cluster, follow the steps below.

Before you begin

Ensure that your system meets the specified hardware and operating system requirements.

Note: Installation of the datastores for the various Managed components to network/remote disks isn't advised due to possible performance and update-stability issues.

Step 1: Download the installer

  1. Log into the Linux machine where you want to install Dynatrace Managed.
  2. Copy the wget command line from the activation email you've received.
  3. Paste the wget command line into your terminal window. Wait for the download to complete and then continue with step 2.

Step 2: Verify the installer

The Dynatrace Managed installer file is digitally signed. The signature file is distributed along with the Dynatrace Managed installer. In conjunction with OpenSSL and the Dynatrace root certificate, the signature file can be used to verify the authenticity of the installer. The signature file has the same name as the installer, with a .sig extension.

To verify the installer file signature use this command (assuming your installer filename is dynatrace-managed.sh):

wget -qO dt-root.cert.pem https://ca.dynatrace.com/dt-root.cert.pem; wget -qO dynatrace-managed.sh.sig https://mcsvc.dynatrace.com/downloads/signature?filename=$(grep -am 1 'ARCH_FILE_NAME=' dynatrace-managed.sh | cut -d= -f2 |sed 's/.tar.gz$//'); openssl cms -inform PEM -binary -verify -CAfile dt-root.cert.pem -in dynatrace-managed.sh.sig -content dynatrace-managed.sh > /dev/null

If verification succeeds, the response should be Verification successful. If the verification fails, the response will be Verification failure followed by details.

Step 3: Run the installer

You need root rights to install Dynatrace Managed. You can use su or sudo to run the installation script. To do this, type one of the following commands into the directory where you downloaded the installation script.

  • Ubuntu Server

    sudo /bin/sh dynatrace-managed.sh
    
  • Red Hat Enterprise Linux

    su -c '/bin/sh dynatrace-managed.sh'
    
  • Other Linux distributions with root session

    /bin/sh dynatrace-managed.sh
    

My company uses a privilege management system other than sudo.

When using pbrun you need to enable the Dynatrace user the ability to run /opt/dtrun/dtrun * Following these steps you can install Dynatrace Managed by specifying the user and the command that replaces sudo.

For example:

/bin/sh dynatrace-managed.sh --system-user dynatrace:dynatrace --sudo-cmd  "/usr/bin/pbrun \$CMD"

Additionally, for maintenance purposes, please consider adding scripts from the locations below:

  • /opt/dynatrace-managed/uninstall-dynatrace.sh
  • /opt/dynatrace-managed/launcher/*
  • /opt/dynatrace-managed/utils/*

You might, for example, want to stop all Dynatrace Managed processes running on a node.

pbrun /opt/dynatrace-managed/launcher/dynatrace.sh stop
Do not remove or overwrite dtrun

It is required by installation and update procedures. The installer calls dtrun without arguments to validate that the user has administrative privileges, but for normal operation Dynatrace calls dtrun with arguments to actually run commands.

Type Accept if you agree to the Dynatrace Managed Terms of use. Installation won't continue until you complete this step. To quit installation press Ctrl+C.

The Dynatrace Managed installer works in interactive mode. It displays prompts for values like installation path and user account. Accept the default values by pressing Enter. To override the settings, type your choices in the terminal and press Enter.
Note: Please have your Dynatrace Managed license key available. You can't complete installation without a license key.

Default settings

  • Installation path (binaries): /opt/dynatrace-managed
  • Dynatrace Server data files: /var/opt/dynatrace-managed
  • The system user who runs Dynatrace processes: dynatrace
  • The system group who runs Dynatrace processes: dynatrace

Bypass interactive mode

To bypass all questions and install with default settings, run the installer with the --install-silent parameter. Be sure to provide your Dynatrace Managed license key as the --license parameter value.

What happens during installation

Dynatrace Managed cluster is a set of specialized components that have been configured 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

The installer also optimizes operating system settings:

  • Swap is turned off (with swapoff).
    Note that enabling swap can result in undesired behavior and so isn't supported.
  • iptables "PREROUTING" rules are enhanced to enable forwarding of communication to Dynatrace Server (via HTTPS on port 8021). To see the exact rules, type iptables -L -vt nat into your terminal.
  • readahead page cache is set to 512.
  • Limits for users are changed 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.
  • max_map_count is modified.

The following system files and directories may be modified 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/

Installation logs

You can find the Dynatrace Managed installation log file in the /opt/dynatrace-managed/installer/ directory. To easily identify the right log file, look for the installation date in the file name. For example, the log file of a successful installation performed on September 30th would be 20160930-173309-success-install-of-managed-installer.log

Installation parameters

To view a list of all available installation parameters, run the installer with the parameter --help.

Step 4: Finalize setup

Copy the environment URL that's provided at the end of the installation process. Paste the address into your browser to complete the remainder of the installation. The following page appears.

Provide a name for your first monitoring environment and set up an administrator account. Once finished, click Next. You will be logged in and directed to the Cluster Management Console. A default domain is generated, which should be used instead of the IP address for secure (HTTPS) connection.

Managed deployment

From the menu of the Cluster Management Console, click Environments to view your newly created environment. Select your environment and then click Go to environment to access the environment's web UI. You can later create additional environments.