→ Applies to: SynetoOS 6.x

The Datto RMM agent is a lightweight software that can be installed on a device to enable remote monitoring and management by a service provider.

It collects device information, allows for proactive monitoring, remote support (including remote takeover), patch deployment, and automated maintenance, and communicates this data to the Datto RMM web interface.

The Datto RMM agent requires Mono (.NET runtime for Linux) which is not included in the default SynetoOS repositories.

The agent requires outbound HTTPS access to the Datto servers. Ensure that your firewall allows outbound 443/tcp access.

Step 1. Connect to SynetoOS appliance via SSH as admin

ssh admin@<your_ip_address_or_hostname>

Step 2. Get root privileges

sudo su -

Add Required Repositories

Step 1. Create the repository file

sudo tee /etc/yum.repos.d/rocky-baseos.repo << 'EOF'

IMPORTANT
Make sure to copy and paste the exact lines below.

[baseos]
name=Rocky Linux 9 - BaseOS
mirrorlist=https://mirrors.rockylinux.org/mirrorlist?arch=x86_64&repo=BaseOS-9
gpgcheck=0
enabled=1
[appstream]
name=Rocky Linux 9 - AppStream
mirrorlist=https://mirrors.rockylinux.org/mirrorlist?arch=x86_64&repo=AppStream-9
gpgcheck=0
enabled=1
[crb]
name=Rocky Linux 9 - CRB
mirrorlist=https://mirrors.rockylinux.org/mirrorlist?arch=x86_64&repo=CRB-9
gpgcheck=0
enabled=1
[epel]
name=Extra Packages for Enterprise Linux 9
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-9&arch=x86_64
gpgcheck=0
enabled=1
EOF

Step 2. Refresh the repository cache

sudo dnf clean all && sudo dnf makecache

Install Mono Packages

Step 1. Install Mono

sudo dnf install -y mono-core

Additional parameters

Parameter	Functionality
mono-core	Mono runtime
libgdiplus	GDI & compatible API
mono-data, mono-web, mono-wcf	Additional Mono libraries

Step 2. Check if Mono was installed correctly

which mono
mono --version

Install Datto Agent

If you're installing the Datto RMM Agent via script:

Run the following command (replace <agentname> with the correct name of the agent)

sudo sh /tmp/<agentname>.sh

To upload the create-datastore file to the /tmp directory on SynetoOS 5, a third-party tool (e.g. WinSCP) must be used.

EXAMPLE

sudo sh AgentSetup_CUSTOM.sh

If you're installing the Datto RMM Agent with direct download:

Download the installer script (replace <your_agent_ID> with the agent ID)

sudo wget -O setup.sh https://pinotage.rmm.datto.com/download-agent/linux/<your_agent_ID>

Install the package

sudo sh setup.sh

The installer will:

• Detect the OS and service manager (systemd)
• Extract and install binaries to /opt/CentraStage/
• Configure the cag.service systemd unit
• Start the agent automatically

Check Installation

Check the agent service status

sudo systemctl status cag

View agent logs

cat /opt/CentraStage/log.txt

Remove Repositories

Step 1. Remove temporary repository file

sudo rm /etc/yum.repos.d/rocky-baseos.repo

Step 2. Clean the package cache

sudo dnf clean all

IMPORTANT
Keep the repositories if you need to update Mono in the future, or re-add them when updates are needed.

Troubleshooting Mono Installation 

Check all repositories are properly added

sudo dnf repolist

Expected results: baseos, appstream, crb, epel, syneto

Check Mono is installed

which mono

Check logs

cat /opt/CentraStage/log.txt

Check systemd journal

sudo journalctl -u cag -f

Agent Management

File Locations

Installed Packages