To install Zenoss on a VPS, provision a 64-bit x86_64 server with a supported RHEL-compatible operating system, create the separate filesystems required by Control Center, run the official host validator, install Docker CE 20.10.17, and stage the authenticated Zenoss image archives and RPMs for your exact release. Then follow the Control Center order: verify hosts, install the repository mirror, load images, install the master and any delegates, configure ZooKeeper for a multi-host design, and deploy the services.
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The documented single-host topology is intended for testing and development. A production monitoring system should be designed as a multi-host deployment when its availability, collector scale, retention, or failure-isolation requirements justify the additional VPS instances.
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Choose the Zenoss release before creating the VPS
Zenoss documentation is release-specific. Select the exact Community Edition or Resource Manager branch first, then keep that branch’s planning, installation, configuration, administration, upgrade, and release-note documents together. The Community Edition archive contains separate documents for 6.2.x and earlier branches, and image names, RPM names, prerequisites, and deployment details can change between releases.
Get an entitlement and the matching files
Downloads are not anonymous. Zenoss directs users to delivery.zenoss.com; access requires a support-portal account or a support request. Do not download an image from a different branch simply because its filename looks similar. A repository mirror, service-definition RPM, and image archive must belong to the same release.
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For Zenoss Core 6.2.1, the installation guide names these artifacts:
install-zenoss-hbase-24.0.8.runinstall-zenoss-opentsdb-24.0.8.runinstall-zenoss-core_6.2-1_1.runzenoss-core-service-6.2.1-1.noarch.rpm
Resource Manager releases use different, release-specific image names. Treat the four filenames above as an example for Core 6.2.1, not as a universal download set.
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Use a supported VPS operating system
Current Control Center prerequisites list these host combinations:
| Distribution | Supported release | Important condition |
|---|---|---|
| CentOS | 7.9 | Every host in one deployment must use the identical distribution, release, and kernel. Set the locale to en_US.UTF-8. |
| AlmaLinux | 8.10 or 9.4 | |
| Rocky Linux | 8.10 or 9.4 | |
| Red Hat Enterprise Linux | 7.9, 8.10, or 9.4 | |
| Other distributions | Not listed as supported | |
| Architecture | 64-bit x86_64 |
Choose a VPS image from that list rather than assuming that any current Linux image will work. In a multi-host installation, mixing, for example, RHEL 8.10 and Rocky 8.10 is not equivalent to using identical hosts; the documentation requires the same distribution, release, and kernel on every host.
Set the locale and time before installation
Configure en_US.UTF-8 on every host and synchronize clocks with NTP or chrony. Consistent time is important for service coordination, certificates, logs, and any multi-host control-plane work. Confirm that DNS can resolve every host’s intended name and that the VPS provider is not silently changing the hostname or resolver configuration during reprovisioning.
Plan the VPS storage layout
The prerequisite figures below are minimum planning values for a master host. They are separate filesystems or storage allocations, not one undifferentiated disk figure:
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Mount or allocation | Minimum | What it covers |
|---|---|---|
/ |
30 GB | Operating system and base packages |
| Swap | 16 GB | Required swap allocation |
/tmp |
16 GB | Temporary installation and runtime work |
| Docker data | 50 GB | Container images and Docker-managed data |
/opt/serviced/var/isvcs |
50 GB | Internal services data |
| Application data | 200 GB | Zenoss application data |
| Application backups | 150 GB | Backup storage |
These are documented minimums for the master role. Device count, event volume, metric retention, image-cache growth, upgrade staging, and backup retention can require more capacity. Put the allocations on storage with predictable I/O and monitor free space; a VPS that satisfies the numbers on day one can still run out of room after several retention cycles.
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CPU and memory sizing
The prerequisite material requires the validator to inspect CPU and memory, but it does not establish one universal numeric CPU or RAM minimum in the information available here. Do not substitute a provider’s generic “monitoring” size for the validator result. Choose a plan with enough headroom for the master services, Docker workloads, collectors, databases, and your expected device inventory, then let the role-specific validation report determine whether the host passes.
Decide between single-host and multi-host deployment
The topology affects cost, failure isolation, storage separation, and operations more than the installation commands do.
| Decision axis | Single host | Multi-host |
|---|---|---|
| Documented use | Testing and development only | Production-oriented design when availability or scale requires it |
| Failure isolation | One VPS failure can stop the entire stack | Masters, delegates, and collectors can be separated across hosts |
| Collector and device scale | Bound by one host’s CPU, memory, storage, and network | Additional delegates or collectors provide placement options |
| Storage | All required master allocations share one VPS | Master and worker roles can have separate storage plans |
| Network policy | Simpler east-west traffic pattern | Requires planned host-to-host reachability and firewall rules |
| Operations | Fewer machines, simpler lab setup | More installation, coordination, and lifecycle work |
“Single-host deployments are recommended for testing and development use only.”
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Use the single-host role when you are learning the product, validating integrations, or building a disposable development environment. For production, evaluate delegates or collectors and the ZooKeeper arrangement described by the multi-host procedures rather than treating a larger single VPS as an automatic substitute.
Prepare the VPS before running Zenoss installers
Confirm administrative access and identity
- Use a 64-bit x86_64 VPS with root or equivalent administrative access.
- Apply the supported distribution release and kernel consistently across all planned hosts.
- Set the system locale to
en_US.UTF-8. - Give each host a stable hostname and forward/reverse DNS appropriate to your network.
- Synchronize time with NTP or chrony.
- Allocate and mount the independent storage areas before validation.
Plan firewall and network ranges
Allow the host-to-host and service traffic specified in the installation guide for your release, while keeping management access restricted to your administration network. Check the Docker bridge subnet before starting the service: if it overlaps the VPS provider’s network, the host network, or a monitored private network, choose a non-conflicting bridge range and configure Docker’s bip and DNS settings as described by the installation documentation. A bridge collision can make containers appear healthy while preventing them from reaching other services or monitored devices.
Install the supporting operating-system packages
Use the package instructions for your selected distribution and release. The documented prerequisites include packages and services for NFS, DNS, time synchronization, and httpd-tools where required. Enable the relevant services before deployment and verify that the package manager has no unresolved dependencies. Do not copy package commands from a different Zenoss branch; repository names and dependency versions can change.
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Run the official host validator
Download the current zenoss-install-host-validate script for the release, copy it to the VPS, and make it executable:
chmod +x zenoss-install-host-validateFor a single-host master, run the documented verification command:
./zenoss-install-host-validate -a verify -d single -r masterIf the script is installed in a directory on your PATH, the same command can be invoked without ./:
zenoss-install-host-validate -a verify -d single -r masterThe verify action performs read-only checks of compute, memory, operating system, and storage resources. It does not repair a VPS or install Zenoss. For a multi-host design, run the role-appropriate master, delegate, or collector form shown in the prerequisites documentation; the role and deployment-mode options must match the host you are validating.
Clear every validation error
- Read the report and classify each failure as CPU, memory, operating system, storage, or network.
- Correct the underlying condition: resize the VPS, fix a mount or filesystem size, align the OS and kernel, set the locale, repair DNS or NTP, or resolve a network-range conflict.
- Run the same role-specific command again.
- Continue only when the required checks pass. Save the successful output with your deployment notes so a replacement host can be compared later.
Do not treat a warning that hides a failed prerequisite as harmless. A successful installer run on an unvalidated host can leave you debugging resource or networking problems that the preflight check was designed to expose.
Install and configure Docker CE
The current master-host procedure specifies Docker CE 20.10.17. Install that version from the supported package source for your distribution, then enable and start the service:
systemctl enable --now dockerConfirm the daemon is active before loading any Zenoss image archives. If your package manager installs a different Docker release by default, pin or select 20.10.17 as required by the Zenoss procedure instead of assuming that “latest” is compatible.
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Set Docker’s temporary directory
The master-host instructions link Docker’s temporary working directory to /tmp. Apply that setting exactly as described in the release guide, and verify that /tmp is the dedicated 16 GB allocation planned earlier. A small or unexpectedly volatile temporary filesystem can interrupt image extraction and service deployment.
Apply the systemd timeout drop-in
Add a Docker systemd drop-in with a 300-second service timeout, then reload systemd and restart Docker. A conventional drop-in has this content:
[Service]
TimeoutSec=300After the restart, check that Docker is active and that the new timeout is loaded. The longer timeout prevents systemd from abandoning slow image or storage operations on a busy VPS.
Check the bridge subnet and DNS
Inspect the Docker network configuration before staging images. If the default bridge overlaps a VPS network or a monitored address range, configure a non-overlapping bip value and the DNS settings required by your environment. Record the selected range in the firewall and network documentation so delegates and collectors use compatible routes.
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Stage the repository, images, and service definitions
Authenticate before transferring files
Use the entitlement obtained from delivery.zenoss.com to download the files for the exact release. Transfer them to the Control Center master over an authenticated administrative channel. Keep checksums or the vendor’s integrity information with the files, and do not rename artifacts in a way that obscures their release.
Install the repository mirror
The Control Center workflow uses a repository mirror on the master. Install the mirror package specified by your release and make it available to the hosts that need Zenoss packages. The mirror and service-definition RPM must match the image set; mixing a 6.2.1 service RPM with another branch’s images is unsupported.
Load the authenticated image archives
Copy the .run image archives to the Control Center master and mark them executable:
chmod +x install-zenoss-hbase-24.0.8.run install-zenoss-opentsdb-24.0.8.run install-zenoss-core_6.2-1_1.runUse the release guide’s image-loading procedure to import the archives into the local authenticated registry. The loader, registry credentials, and image list are release-specific; do not replace that procedure with a generic Docker load command unless the guide for your release explicitly says to do so.
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For Core 6.2.1, install zenoss-core-service-6.2.1-1.noarch.rpm after the repository and image staging steps required by the guide. Resource Manager and later branches use different service-definition packages, so verify the filename before installation.
Follow the Control Center deployment sequence
The official installation index separates preparation from deployment. Keep this order so that a failure is associated with the correct layer:
- Verify hosts. Run the validator for the master and, in a multi-host design, each delegate or collector role.
- Download and stage files. Place the authenticated archives, repository packages, and service-definition RPMs on the Control Center master.
- Install the repository mirror. Confirm that required hosts can reach it and that the package set belongs to the selected release.
- Stage Docker images. Load the image archives into the local registry and verify that the expected images are available.
- Install the master. Apply the master installation procedure for the release, including the Docker and storage prerequisites.
- Install delegates or collectors. In a multi-host layout, add each role using the corresponding procedure and validated host.
- Configure ZooKeeper where applicable. Build the ensemble and host relationships required by the multi-host deployment instructions.
- Deploy Zenoss services. Use Control Center to deploy the service definitions and wait for the components to reach their healthy state before adding devices.
Single-host path
For a lab or development installation, select the single-host deployment tasks after the master is installed. All services share the master VPS and its planned storage allocations. Keep this environment separate from production monitoring if an outage of the VPS would remove both monitoring and the services being monitored.
Multi-host path
For production, follow the multi-host tasks to place delegates or collectors on their own validated hosts and configure ZooKeeper as required. Plan the network rules and DNS entries before joining hosts; adding a delegate after the fact is possible only when the host can reach the master, repository, registry, and other required services on the documented ports.
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Set credentials and verify Control Center
Set the administrator credentials during the release-specific configuration procedure. Sign in to Control Center and confirm that its services, the Zenoss components, and the local registry report healthy states. A service that is merely “running” at the process level is not enough if Control Center reports a failed dependency.
Test a small device set
Add a small, representative set of devices first. Confirm name resolution, reachability, credentials, event collection, and metric flow before onboarding the full inventory. This staged test separates a Zenoss deployment problem from a device-side firewall, SNMP, WMI, or credential problem.
Validate operations
- Check DNS resolution from the master and every collector that will monitor devices.
- Confirm NTP or chrony remains synchronized after reboots.
- Watch Docker, Control Center, and Zenoss service health while the first devices send data.
- Verify that application-data and backup files are landing on the intended allocations.
- Record the release, image filenames, RPM versions, host kernels, storage sizes, and topology.
Keep the exact release’s configuration and administration guides with those records. Port assignments, credentials, image names, and upgrade procedures vary by release, so a generic runbook is not a safe substitute.
Troubleshoot common installation failures
| Symptom | Likely area | Corrective action |
|---|---|---|
| The validator reports CPU or memory failure | VPS plan is undersized for the selected role | Resize the host or move the role to a plan with more resources, then rerun the role-specific validator. |
| Storage checks fail | A required filesystem is missing, too small, or mounted at the wrong path | Fix the mount and allocation, including Docker data, /opt/serviced/var/isvcs, application data, and backups, then validate again. |
| OS or kernel mismatch appears in a multi-host check | Hosts were built from different images or updated unevenly | Standardize distribution, release, kernel, and locale across every host. |
| Containers cannot reach the VPS network | Docker bridge subnet overlaps an existing route | Choose a non-conflicting bip range and DNS configuration, restart Docker, and retest connectivity. |
| Docker stops during a slow operation | The systemd service timeout is too short | Confirm the drop-in contains TimeoutSec=300, reload systemd, and restart Docker. |
| Image loading or package installation asks for credentials | Registry or repository authentication was not configured | Use the authenticated entitlement, install the matching repository mirror, and repeat staging with the release’s documented procedure. |
| Control Center shows incompatible images or services | Artifacts from different Zenoss releases were mixed | Remove the mismatched set and stage the image archives and service-definition RPM belonging to one release. |
| A delegate or collector will not join | DNS, firewall, time, or host-role preparation is incomplete | Verify name resolution, clock synchronization, required service reachability, identical host prerequisites, and the role-specific validator result. |
| Services deploy but monitoring data is incomplete | Device-side access or collector placement issue | Test a small device set, check credentials and network policy from the assigned collector, and expand onboarding only after data and events are confirmed. |
Production readiness checklist
- Supported x86_64 distribution and release selected for every host.
- Identical kernel and
en_US.UTF-8locale across the deployment. - NTP or chrony and DNS verified from each role.
- Master storage allocations meet or exceed 30 GB root, 16 GB swap, 16 GB
/tmp, 50 GB Docker data, 50 GB internal-services data, 200 GB application data, and 150 GB backups. - Validator passes for every planned role.
- Docker CE 20.10.17 installed, enabled, and running.
- Docker temporary-directory and 300-second systemd timeout settings applied.
- Docker bridge subnet checked against VPS and monitored networks.
- NFS, DNS, time-synchronization, and
httpd-toolsdependencies installed where the release requires them. - Authenticated, release-matched image archives, repository mirror, and service-definition RPM staged.
- Multi-host firewall and ZooKeeper design documented before delegates or collectors are added.
- Administrator credentials, service health, backup paths, and a small device test completed.
Once these checks pass, the VPS is prepared for a supportable Zenoss deployment rather than merely an installation that happened to complete. The release-specific guides remain the authority for any command, port, image, credential, or upgrade detail not listed here.
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