This section gives an overview over important resource limits that help ensure the health and security of the Mender Server.
Many limits vary based on the Device tier (standard, micro, or system). Device tiers classify devices by their capabilities and use cases.
The frequency with which a Device checks for updates. This varies by device tier.
| Device Tier | Default Interval | Configuration |
|---|---|---|
| Micro | 604800 seconds (7 days) |
Mender MCU Client configuration |
| Standard | 1800 seconds (30 minutes) |
Mender Client configuration |
| System | 1800 seconds (30 minutes) |
Mender Client configuration |
Warning: Using shorter than default intervals with hosted Mender is considered excessive use and may trigger rate limiting, unless it is 10 devices or less for trial/testing or otherwise agreed upon in advance.
The frequency a Device can update its current inventory to the Mender Server. This varies by device tier.
| Device Tier | Default Interval | Configuration |
|---|---|---|
| Micro | 604800 seconds (7 days) |
Mender MCU Client configuration |
| Standard | 28800 seconds (8 hours) |
Mender Client configuration |
| System | 28800 seconds (8 hours) |
Mender Client configuration |
Warning: Using shorter than default intervals with hosted Mender is considered excessive use and may trigger rate limiting, unless it is 10 devices or less for trial/testing or otherwise agreed upon in advance.
| Tier | Default Maximum Artifact Size | Notes |
|---|---|---|
| Micro | 10 MiB | Limited by MCU flash memory, typically < 10 MiB |
| Standard | 10 GiB | Configurable via DEPLOYMENTS_STORAGE_MAX_IMAGE_SIZE |
| System | 10 GiB | Applies to Manifest Artifacts and component artifacts |
The maximum number of times that mender-update retries continuing a download of an Artifact that was interrupted e.g. by network issues.
Default: 10
Minimum: 1
Maximum: 10,000
This is a Client side configuration, see Mender Client configuration.
The maximum size of API payload for all API calls unless otherwise specified affects POST API calls. If a deployment log is over this limit, it can fail to upload the log.
Default: 1 MiB
Override per service with the Mender Server environment variable: service_REQUEST_SIZE_LIMIT e.g. DEPLOYMENTS_REQUEST_SIZE_LIMIT
The maximum size of single-file type Artifacts generated by the Mender Server with the Generate Artifact endpoint.
Default: 256 MiB
Override with the Mender Server environment variable: DEPLOYMENTS_STORAGE_MAX_GENERATE_DATA_SIZE
The maximum size of a single Device inventory on the Mender Server is determined by the API upload limit
Default: 1 MiB
Overriding is done by INVENTORY_REQUEST_SIZE_LIMIT up to 10MB, which is the database limit.
The maximum length of Release names when creating Releases on the Mender Server.
Default: 256 characters
Overriding this limit is not possible
The maximum length of keys and values in Mender Configure Device attributes.
Default: 4096 characters
Overriding this limit is not possible
The maximum number of active and pending deployments per tenant.
Default: No limit
Override with the Mender Server environment variable: DEPLOYMENTS_LIMIT_MAX_ACTIVE_DEPLOYMENTS
Warning: This limit is set to 800 active deployments per tenant on hosted Mender.
The maximum number of tags that can be defined per Device inventory.
Default: 20
Override with the Mender Server environment variable: INVENTORY_LIMIT_TAGS
The maximum uncompressed size of the root file system in Mender Artifacts that you can use to trigger server-side binary delta generation.
Default: 5 GiB
Override with the Mender Server environment variable: DEPLOYMENTS_SERVER_SIDE_DELTA_GENERATION_MAX_ARTIFACT_SIZE_MB
Note that the environment variable is represented in MiB, and its default value is 5120.
The duration from when an event happened until the audit log is removed from the server.
Default: 365 days
Override with helm value auditlogs.logRetentionSeconds.
Note that the value is specified in seconds (365 days is 31536000 seconds).
The maximum number of permission sets (e.g., User Management, Releases, Device Group Management) that can be assigned to a custom Role on the Mender Server.
Default: 15
Override with the Mender Server environment variable: USERADM_LIMIT_PERMISSION_SETS_PER_ROLE