[{"data":1,"prerenderedAt":1059},["ShallowReactive",2],{"docs-\u002Fdocs\u002Fuser\u002Fhigh-availability\u002F":3,"featureCatalog":217,"docs-nav":612},{"id":4,"title":5,"body":6,"description":16,"extension":206,"layout":207,"meta":208,"navGroup":207,"navGroupOrder":207,"navOrder":207,"navTitle":5,"navigation":209,"originalPath":210,"path":211,"redirect":207,"seo":212,"stem":213,"updated":214,"version":215,"__hash__":216},"docs\u002Fdocs\u002Fuser\u002Fhigh-availability.md","High Availability mode",{"type":7,"value":8,"toc":190},"minimark",[9,13,17,20,30,33,38,69,72,76,79,82,85,93,96,100,103,106,111,114,117,124,127,131,134,137,140,144,147,150,157,160,164,167,170,180,187],[10,11,5],"h1",{"id":12},"high-availability-mode",[14,15,16],"p",{},"High Availability mode allows you to run multiple copies of your Node-RED instance,\nwith incoming work distributed between them.",[14,18,19],{},"The following requirements apply:",[21,22,23,27],"ul",{},[24,25,26],"li",{},"FlowFuse 1.8+ running with an EE license and the kubernetes driver",[24,28,29],{},"FlowFuse Cloud",[14,31,32],{},"Within FlowFuse Cloud it is currently free to use for all teams, but will\nbecome a chargeable feature in a future release.",[34,35,37],"h2",{"id":36},"restrictions","Restrictions",[21,39,40,43,46,55,58,66],{},[24,41,42],{},"Enabling or disabling HA mode requires a restart of the Instance.",[24,44,45],{},"When in HA mode, two copies of the flows are run.",[24,47,48,49,54],{},"Flows cannot be directly modified in an HA Instance; the editor is disabled.\nA ",[50,51,53],"a",{"href":52},"\u002Fdocs\u002Fuser\u002Fdevops-pipelines","DevOps Pipeline"," should be created to deploy new flows to the instance.",[24,56,57],{},"Any internal state of the flows is not shared between the HA copies.",[24,59,60,61,65],{},"The ",[50,62,64],{"href":63},"\u002Fdocs\u002Fuser\u002Fpersistent-context","FlowFuse Persistent Context"," is not synchronised\nbetween the HA copies",[24,67,68],{},"The logs view show combined logs of all copies. An identifier indicates which replica the log message originates from. You have the possibility to filter the messages.",[14,70,71],{},"More details of these restrictions are available below.",[34,73,75],{"id":74},"setting-up-high-availability-mode","Setting up High Availability mode",[14,77,78],{},"To make full use of the HA mode you will need two separate Node-RED instances.",[14,80,81],{},"The first will be your development instance. This is where you can build and test\nyour flows.",[14,83,84],{},"The second will be your HA 'production' instance. This instance will run multiple\ncopies of the flows and get updated from the development instance using a DevOps\nPipeline between the two instances.",[14,86,87,88,92],{},"To enable HA mode on your production instance, open the ",[50,89,91],{"href":90},"\u002Fdocs\u002Fuser\u002Finstance-settings","settings page"," for your\ninstance and go to the High Availability section. Click the 'Enable HA mode' button\nand confirm the choice in the dialog.",[14,94,95],{},"Once enabled the instance will be restarted to apply the settings. Once enabled,\nthe editor will no longer be available.",[34,97,99],{"id":98},"editing-an-ha-instance","Editing an HA instance",[14,101,102],{},"As the editor is disabled for an HA instance the flows cannot be directly modified.",[14,104,105],{},"There are two options for updating the flows on an HA instance.",[107,108,110],"h3",{"id":109},"disabling-ha-mode","Disabling HA mode",[14,112,113],{},"If you disable HA mode via the setting page, after the instance has been restarted\nthe editor will be available and changes can be made. However, this will mean a\nperiod of downtime whilst the instance is brought in and out of HA mode.",[107,115,53],{"id":116},"devops-pipeline",[14,118,119,120,123],{},"Create a ",[50,121,122],{"href":52},"DevOps pipeline"," from a 'development' Instance to push updates to your HA\ninstance.",[14,125,126],{},"This allows you to free develop your flows in one instance and when you are happy\nwith the results, use the pipeline to push the changes over to the HA instance.",[34,128,130],{"id":129},"building-ha-ready-flows","Building HA-ready flows",[14,132,133],{},"Whilst FlowFuse can help run multiple copies of your flows, and provide the\nnecessary load balancing between those copies, it still requires the flows to\nhave been created with HA in mind.",[14,135,136],{},"This guide provides some things to consider when building HA-ready flows. We'll\ncontinue to expand on this as we gather more feedback from our users.",[14,138,139],{},"There are two things to consider - how state is managed and how work is distributed\nbetween the copies.",[107,141,143],{"id":142},"managing-state","Managing state",[14,145,146],{},"The most well-suited flows for HA are those that do not depend on local state being\nmaintain between individual messages coming into the flow. This is because, in an HA\ninstance, the messages are distributed between the copies - none of them get to see\nevery message.",[14,148,149],{},"When state is required, it needs to be stored somewhere that all instances can\naccess it - for example an external database service.",[14,151,152,153,156],{},"FlowFuse provides a ",[50,154,155],{"href":63},"persistent context"," option - however\nthis includes a local caching layer that means it doesn't fully synchronize between\nthe instances in real time. This is something we'll be working on for a future iteration\nof the feature, as it will require some changes in Node-RED to unlock its full potential.",[14,158,159],{},"There is also the state that is implicitly maintained within the nodes of a flow.\nFor example, the Smooth node can be used to calculate a running average value of\nmessages passing through it. The node does that by keeping in memory the recent\nvalues so it can recalculate the average with each update. In an HA instance,\nthe node will only be calculating the average for the messages it sees.",[107,161,163],{"id":162},"routing-work","Routing work",[14,165,166],{},"When HA is enabled, all HTTP traffic directed at the instance will be load-balanced\nbetween the copies automatically.",[14,168,169],{},"It gets a little more complicated where flows connect out to external systems to\npull in work - for example, when using MQTT.",[14,171,172,173,179],{},"MQTT includes a feature called ",[50,174,178],{"href":175,"rel":176},"https:\u002F\u002Fwww.hivemq.com\u002Fblog\u002Fmqtt5-essentials-part7-shared-subscriptions\u002F",[177],"nofollow","Shared Subscriptions","\nthat allows a broker to distribute messages between a group of subscribers. This\nprovides the load balancing needed for an HA instance - but the flow must be configured\nto use the appropriate shared subscription topics, as well as to not set a ClientID on the connection to avoid conflicts between the connections.",[14,181,60,182,186],{},[50,183,185],{"href":184},"\u002Fdocs\u002Fuser\u002Fprojectnodes","Project Nodes"," have been updated to support shared subscriptions\nautomatically when running in HA mode.",[14,188,189],{},"There are lots of other nodes that can be used to trigger flows, whether by\nlistening for events on an API, connecting to locally attached hardware and many\nthings in between. Typically, those that are more cloud-aligned, such as messaging\nsystems like Kafka and AMQP will have very well established ways of doing load\nbalancing.",{"title":191,"searchDepth":192,"depth":192,"links":193},"",4,[194,196,197,202],{"id":36,"depth":195,"text":37},2,{"id":74,"depth":195,"text":75},{"id":98,"depth":195,"text":99,"children":198},[199,201],{"id":109,"depth":200,"text":110},3,{"id":116,"depth":200,"text":53},{"id":129,"depth":195,"text":130,"children":203},[204,205],{"id":142,"depth":200,"text":143},{"id":162,"depth":200,"text":163},"md",null,{},true,"user\u002Fhigh-availability.md","\u002Fdocs\u002Fuser\u002Fhigh-availability",{"title":5,"description":16},"docs\u002Fuser\u002Fhigh-availability","2023-09-28 17:07:19 +0100","2.33.2","SyzH0G8iT92Aj26_M2zfzKEt6V_2J5A7OX5G_PDfRzs",{"id":218,"extension":219,"meta":220,"sections":221,"stem":610,"__hash__":611},"featureCatalog\u002Ffeature-catalog.yml","yml",{},[222,273,374,436,513,592],{"id":223,"title":224,"features":225},"ai-automation","AI & Automation",[226,236,246,256,262,268],{"id":227,"title":228,"description":229,"docsLink":230,"changelog":231,"tiers":235},"flowfuse-expert-ai","FlowFuse Expert AI","Build industrial apps with agents, and query the state of the factory with an agent. Adapt your current hardware and machines so agentic work can be done against them, without ripping and replacing what's already on the plant floor.","\u002Fdocs\u002Fuser\u002Fexpert\u002F",[232],{"url":233,"release":234},"\u002Fchangelog\u002F2026\u002F02\u002Fff-expert-update-banner\u002F","2.28",{"edge":209,"hub":209,"fleet":209},{"id":237,"title":238,"description":239,"docsLink":240,"changelog":241,"subfeature":209,"showOnPricing":244,"tiers":245},"flowfuse-expert-support-mode","Support Mode","Chat-based assistance for FlowFuse and Node-RED, including Node-RED instance management through natural language.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F#support-mode",[242],{"url":243,"release":234},"\u002Fchangelog\u002F2026\u002F02\u002Fff-expert-debug-log-context\u002F",false,{"edge":209,"hub":209,"fleet":209},{"id":247,"title":248,"description":249,"docsLink":250,"changelog":251,"subfeature":209,"showOnPricing":244,"tiers":255},"flowfuse-expert-application-building","Application Building","Describe what you want to build and FlowFuse Expert assembles it on your workspace, adding tabs, wiring nodes, and configuring properties.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F",[252],{"url":253,"release":254},"\u002Fchangelog\u002F2026\u002F05\u002Fexpert-application-building\u002F","2.30",{"edge":209,"hub":209,"fleet":209},{"id":257,"title":258,"description":259,"docsLink":260,"subfeature":209,"beta":209,"showOnPricing":244,"tiers":261},"flowfuse-expert-insights-mode","Insights Mode","Connects FlowFuse Expert to MCP servers in your Node-RED instances, enabling real-time data queries and actions through a single chat interface.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F#insights-mode",{"edge":209,"hub":209,"fleet":209},{"id":263,"title":264,"description":265,"docsLink":266,"tiers":267},"mcp-servers","Agentic Operations","Expose your Node-RED flows as tools an AI agent can call directly, so agents can query the state of the factory or trigger actions without custom integration work.","\u002Fnode-red\u002Fflowfuse\u002Fmcp\u002F",{"edge":209,"hub":209,"fleet":209},{"id":269,"title":270,"description":271,"tiers":272},"onnx-integration","ONNX Integration","Run trained machine learning models directly in your flows, including on edge hardware, without sending data out to an external inference service.",{"edge":209,"hub":209,"fleet":209},{"id":274,"title":275,"features":276},"build","Build",[277,283,289,299,305,311,315,321,327,335,341,345,349,358,366],{"id":278,"title":279,"description":280,"docsLink":281,"tiers":282},"edge-development","Edge Development","Develop and test Node-RED flows directly on edge devices with a remote editor proxy.","\u002Fdocs\u002Fdevice-agent\u002Fquickstart\u002F",{"edge":209,"hub":244,"fleet":209},{"id":284,"title":285,"description":286,"docsLink":287,"tiers":288},"private-npm-registry","Custom Node-RED Nodes","Create and manage your own private npm registry for Node-RED nodes, so you can share custom nodes across your team and devices without publishing them publicly.","\u002Fdocs\u002Fuser\u002Fcustom-npm-packages\u002F",{"edge":209,"hub":209,"fleet":209},{"id":290,"title":291,"description":292,"docsLink":293,"changelog":294,"tiers":298},"flowfuse-tables","FlowFuse Tables","A managed PostgreSQL database for every application, so you can store and query structured data without standing up and maintaining your own database.","\u002Fdocs\u002Fuser\u002Fff-tables\u002F",[295],{"url":296,"release":297},"\u002Fchangelog\u002F2026\u002F07\u002Fexpert-tables-automation\u002F","2.33",{"edge":209,"hub":209,"fleet":209},{"id":300,"title":301,"description":302,"docsLink":303,"tiers":304},"persistent-files","File Storage","Store and retrieve files from your Node-RED flows, with automatic replication and backup across your devices and hosted instances.","\u002Fdocs\u002Finstall\u002Ffile-storage\u002F",{"edge":209,"hub":209,"fleet":209},{"id":306,"title":307,"description":308,"docsLink":309,"showOnPricing":244,"tiers":310},"persistent-context","Persistent Context","In-memory values defined in a Node-RED flow persist across project restarts and upgrades.","\u002Fdocs\u002Fuser\u002Fpersistent-context\u002F",{"edge":209,"hub":209,"fleet":209},{"id":312,"title":313,"showOnPricing":244,"tiers":314},"static-assets","Static Assets",{"edge":209,"hub":209,"fleet":209},{"id":316,"title":317,"description":318,"docsLink":319,"tiers":320},"team-library","Team Library","Set up standard nodes and flows that can be shared with all team members across your organisation.","\u002Fdocs\u002Fuser\u002Fshared-library\u002F",{"edge":209,"hub":209,"fleet":209},{"id":322,"title":323,"description":324,"docsLink":325,"tiers":326},"personalised-multi-user-dashboards","Personalised Multi-User Dashboards","Build applications that provide unique data to each logged-in user using personalised multi-user dashboards.","https:\u002F\u002Fdashboard.flowfuse.com\u002Fuser\u002Fmulti-tenancy.html",{"edge":209,"hub":209,"fleet":209},{"id":328,"title":329,"description":330,"changelog":331,"subfeature":209,"showOnPricing":244,"tiers":334},"dashboards-view","Dashboards View","Browse and open every dashboard across your team from a dedicated Dashboards view, at both team and application level, without leaving FlowFuse.",[332],{"url":333,"release":297},"\u002Fchangelog\u002F2026\u002F07\u002Fteam-and-application-dashboards\u002F",{"edge":209,"hub":209,"fleet":209},{"id":336,"title":337,"description":338,"docsLink":339,"tiers":340},"blueprints-converge","Blueprints","Ready-made starting points for your apps, from cross-team Converge templates to OT and IT specific blueprints.","\u002Fdocs\u002Fuser\u002Fconcepts\u002F#blueprint",{"edge":209,"hub":209,"fleet":209},{"id":342,"title":343,"subfeature":209,"showOnPricing":244,"tiers":344},"blueprints-ot-apps","Blueprints - OT APPS",{"edge":209,"hub":244,"fleet":209},{"id":346,"title":347,"subfeature":209,"showOnPricing":244,"tiers":348},"blueprints-it-apps","Blueprints - IT APPS",{"edge":244,"hub":209,"fleet":244},{"id":350,"title":351,"description":352,"changelog":353,"showOnPricing":244,"tiers":357},"immersive-editor-snapshots","Snapshot Details in Immersive Editor","View and manage snapshot details directly inside the immersive editor without leaving your editing session.",[354],{"url":355,"release":356},"\u002Fchangelog\u002F2026\u002F03\u002Fsnapshot-detail-modal-immersive-editor\u002F","2.29",{"edge":209,"hub":209,"fleet":209},{"id":359,"title":360,"description":361,"changelog":362,"showOnPricing":244,"tiers":365},"immersive-editor-drawer","Customisable Immersive Editor Drawer","Pin, move, resize, or full-screen the immersive editor drawer. Your preferences are remembered between sessions.",[363],{"url":364,"release":254},"\u002Fchangelog\u002F2026\u002F04\u002Fimmersive-editor-drawer\u002F",{"edge":209,"hub":209,"fleet":209},{"id":367,"title":368,"description":369,"changelog":370,"showOnPricing":244,"tiers":373},"embedded-editor-tab-title","Embedded Editor Browser Tab Title","The browser tab title updates to reflect the active Node-RED canvas tab when working in the embedded editor.",[371],{"url":372,"release":356},"\u002Fchangelog\u002F2026\u002F03\u002Fembedded-editor-tab-title\u002F",{"edge":209,"hub":209,"fleet":209},{"id":375,"title":376,"features":377},"deploy","Deploy",[378,384,393,399,405,411,417,423,428],{"id":379,"title":380,"description":381,"docsLink":382,"tiers":383},"hosted-instances","Cloud Instances","Run Node-RED instances managed and hosted by FlowFuse.","\u002Fdocs\u002Fuser\u002Fintroduction\u002F#creating-a-node-red-instance",{"edge":209,"hub":209,"fleet":209},{"id":385,"title":386,"description":387,"docsLink":388,"changelog":389,"tiers":392},"edge-devices","Edge Instances","Deploy and mange your Node-RED instances on edge PLCs and gateways, with full visibility and control from the cloud.","\u002Fdocs\u002Fdevice-agent\u002Fintroduction\u002F",[390],{"url":391,"release":234},"\u002Fchangelog\u002F2026\u002F02\u002Fdevice-agent-nodejs-options\u002F",{"edge":209,"hub":244,"fleet":209},{"id":394,"title":395,"description":396,"docsLink":397,"tiers":398},"custom-hostnames","Custom Hostnames","Access your Node-RED application via your own domain name.","\u002Fdocs\u002Fuser\u002Fcustom-hostnames\u002F",{"edge":244,"hub":209,"fleet":244},{"id":400,"title":401,"description":402,"docsLink":403,"tiers":404},"mqtt-broker","MQTT Broker","Manage and create MQTT clients to transport data for efficient messaging and communication within your applications.","\u002Fdocs\u002Fuser\u002Fteambroker\u002F",{"edge":209,"hub":244,"fleet":209},{"id":406,"title":407,"description":408,"docsLink":409,"showOnPricing":244,"tiers":410},"project-nodes","Project Nodes aka seamless project comms","FlowFuse Project Nodes enable the passing of data and messages between your Node-RED projects.","\u002Fdocs\u002Fuser\u002Fprojectnodes\u002F",{"edge":209,"hub":209,"fleet":209},{"id":412,"title":413,"description":414,"docsLink":415,"tiers":416},"devops-pipelines","DevOps Pipelines","Set up different environments for development, testing, and production Node-RED instances to support a full software delivery lifecycle.","\u002Fdocs\u002Fuser\u002Fdevops-pipelines\u002F",{"edge":209,"hub":209,"fleet":209},{"id":418,"title":419,"description":420,"docsLink":421,"tiers":422},"git-integration","Git Integration","Back up your flows to a remote Git repository through a DevOps Pipeline. Supports GitHub and Azure DevOps repositories.","\u002Fdocs\u002Fuser\u002Fdevops-pipelines\u002F#git-repository-stage",{"edge":244,"hub":209,"fleet":244},{"id":424,"title":425,"description":426,"docsLink":421,"subfeature":209,"showOnPricing":244,"tiers":427},"git-integration-github","GitHub","Push and pull snapshots to GitHub repositories through DevOps Pipeline Git Stages.",{"edge":244,"hub":209,"fleet":244},{"id":429,"title":430,"description":431,"docsLink":421,"changelog":432,"subfeature":209,"showOnPricing":244,"tiers":435},"git-integration-azure","Azure DevOps","Push and pull snapshots to Azure DevOps repositories through DevOps Pipeline Git Stages.",[433],{"url":434,"release":356},"\u002Fchangelog\u002F2026\u002F03\u002Fazure-dev-ops-gitops\u002F",{"edge":244,"hub":209,"fleet":244},{"id":437,"title":438,"features":439},"operate-maintain","Operate & Maintain",[440,446,452,457,465,469,473,478,484,490,495,501,505,509],{"id":441,"title":442,"description":443,"docsLink":444,"tiers":445},"snapshots","Snapshots & Version History","Automatic snapshots on remote devices and hosted instances, plus a full version history timeline so you can roll back to any prior state.","\u002Fdocs\u002Fuser\u002Fsnapshots\u002F",{"edge":209,"hub":209,"fleet":209},{"id":447,"title":448,"description":449,"docsLink":450,"subfeature":209,"showOnPricing":244,"tiers":451},"auto-snapshot-remote","Auto Snapshot (Remote)","Automatically capture a snapshot every time a remote instance is deployed, so you always have a recoverable history of what was running on each device.","\u002Fdocs\u002Fuser\u002Fsnapshots\u002F#auto-snapshots",{"edge":209,"hub":209,"fleet":209},{"id":453,"title":454,"description":455,"docsLink":450,"subfeature":209,"showOnPricing":244,"tiers":456},"auto-snapshot-hosted","Auto Snapshot (Hosted)","Automatically capture a snapshot every time a hosted instance is deployed, so you always have a recoverable history of what was running.",{"edge":209,"hub":209,"fleet":209},{"id":458,"title":459,"description":460,"changelog":461,"subfeature":209,"showOnPricing":244,"tiers":464},"snapshot-comparison","Snapshot Comparison","Compare two snapshots side-by-side with a navigable diff view. Step through every changed, added, or deleted node and see property and code diffs.",[462],{"url":463,"release":356},"\u002Fchangelog\u002F2026\u002F04\u002Fsnapshot-diff-viewer\u002F",{"edge":209,"hub":209,"fleet":209},{"id":466,"title":467,"subfeature":209,"showOnPricing":244,"tiers":468},"version-history-timeline","Version History Timeline",{"edge":209,"hub":209,"fleet":209},{"id":470,"title":471,"tiers":472},"unlimited-workflow-executions","Unlimited Workflow Executions",{"edge":209,"hub":209,"fleet":209},{"id":474,"title":475,"description":476,"tiers":477},"device-fleet-updates","Device Fleet Updates","Connect to edge devices to quickly assess and update logic. 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