Workflow: map out an n8n workflow that achieves Splitout Code Update Webhook
Integrations: code, emailSend, filter, httpRequest, scheduleTrigger, set, sort, splitOut, ssh

{"nodes": [{"id": "6b1865a7-f150-4d2b-b1f7-37c68b2173d6", "name": "Fetch Manifest Digest", "type": "n8n-nodes-base.httpRequest", "position": [920, -300], "parameters": {"url": "={{\"https://<<your-registry-url>>/v2/\" + $json.name + \"/manifests/\" + $json.tag}}", "options": {"fullResponse": true}, "authentication": "genericCredentialType", "genericAuthType": "httpBasicAuth", "headerParametersUi": {"parameter": [{"name": "Accept", "value": "application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, application/vnd.docker.distribution.manifest.list.v2+json"}]}}, "typeVersion": 2}, {"id": "3c1daca9-3897-4596-b62d-db561f8cb047", "name": "Remove Old Tags", "type": "n8n-nodes-base.httpRequest", "onError": "continueErrorOutput", "position": [840, -40], "parameters": {"url": "={{\"https://<<your-registry-url>>/v2/\" + $json.image + \"/manifests/\" + $json.tag.digest}}", "options": {}, "requestMethod": "DELETE", "authentication": "genericCredentialType", "genericAuthType": "httpBasicAuth", "headerParametersUi": {"parameter": [{"name": "Accept", "value": "application/vnd.docker.distribution.manifest.v2+json"}]}}, "typeVersion": 2}, {"id": "6974749e-8c85-4334-a7e7-e964f057ed6f", "name": "Retrieve Image Tags", "type": "n8n-nodes-base.httpRequest", "position": [400, -300], "parameters": {"url": "={{\"https://<<your-registry-url>>/v2/\" + $json[\"image\"] + \"/tags/list\"}}", "options": {}, "authentication": "genericCredentialType", "genericAuthType": "httpBasicAuth", "headerParametersUi": {"parameter": [{"name": "Accept", "value": "application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, application/vnd.docker.distribution.manifest.list.v2+json"}]}}, "typeVersion": 2}, {"id": "30857c32-508e-4f95-8e26-c9f2fc84e074", "name": "List Images", "type": "n8n-nodes-base.httpRequest", "position": [40, -300], "parameters": {"url": "https://<<your-registry-url>>/v2/_catalog", "options": {}, "authentication": "genericCredentialType", "genericAuthType": "httpBasicAuth"}, "typeVersion": 2}, {"id": "c5965a6a-28e6-4217-a846-a849de153430", "name": "Extract Image Names", "type": "n8n-nodes-base.code", "position": [220, -300], "parameters": {"jsCode": "const images = items[0].json.repositories;\nreturn images.map(image => ({ json: { image } }));"}, "typeVersion": 2}, {"id": "b13eb6e5-1a16-4992-b0bd-9b228559fecf", "name": "Identify Tags to Remove", "type": "n8n-nodes-base.code", "position": [600, -40], "parameters": {"jsCode": "const result = [];\n\nfor (const item of items) {\n  const tags = item.json.tags;\n  if (tags) {\n    const latestTag = tags.includes('latest') ? 'latest' : null;\n    const sortedTags = tags.filter(tag => tag !== 'latest')\n                            .sort((a, b) => new Date(b.created) - new Date(a.created));\n    const keepTags = sortedTags.slice(0, 10);\n    if (latestTag) keepTags.push('latest');\n    const deleteTags = sortedTags.slice(10);\n    result.push(...deleteTags.map(tag => ({ json: { image: item.json.name, tag } })));\n  }\n}\n\nreturn result;\n"}, "typeVersion": 2}, {"id": "da15ae49-09ee-4658-86a5-9b0a2180c637", "name": "Scheduled Trigger", "type": "n8n-nodes-base.scheduleTrigger", "position": [-140, -300], "parameters": {"rule": {"interval": [{"triggerAtHour": 1}]}}, "typeVersion": 1.2}, {"id": "bcc347be-5520-46c0-aac9-0b14ddd8b184", "name": "Send Notification Email", "type": "n8n-nodes-base.emailSend", "position": [840, 180], "webhookId": "47f852c3-7136-4e6d-92f6-47322dbba5da", "parameters": {"text": "=Image : {{ $json.image }}\nTag : {{ $json.tag.tag }}\n\nRemoved", "options": {}, "subject": "Docker Registry Cleaner Notification", "toEmail": "to@example.com", "fromEmail": "from@example.com", "emailFormat": "text"}, "typeVersion": 2.1}, {"id": "2c3770ef-cb4c-4007-8897-f4eb7ad3b7cf", "name": "Split Tags", "type": "n8n-nodes-base.splitOut", "position": [580, -300], "parameters": {"include": "selectedOtherFields", "options": {"destinationFieldName": "tag"}, "fieldToSplitOut": "tags", "fieldsToInclude": "name"}, "typeVersion": 1}, {"id": "4fffa947-02cf-4608-acab-8284250cf622", "name": "Filter Valid Tags", "type": "n8n-nodes-base.filter", "position": [740, -300], "parameters": {"options": {}, "conditions": {"options": {"version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict"}, "combinator": "and", "conditions": [{"id": "bb56b84e-e7cb-4867-93f8-ac40c71bde4f", "operator": {"type": "string", "operation": "notEmpty", "singleValue": true}, "leftValue": "={{ $json.tag }}", "rightValue": ""}, {"id": "acd8e00c-5fa0-4c62-ba96-9e6f456f7703", "operator": {"type": "string", "operation": "notEmpty", "singleValue": true}, "leftValue": "={{ $json.name }}", "rightValue": ""}]}}, "typeVersion": 2.2}, {"id": "c023ba14-d12d-497c-9b30-97db04a34c1b", "name": "Fetch Manifest Digest for Blob", "type": "n8n-nodes-base.httpRequest", "position": [-120, -40], "parameters": {"url": "={{\"https://<<your-registry-url>>/v2/\" + $('Filter Valid Tags').item.json.name + \"/blobs/\" + $json.body.config.digest}}", "options": {"fullResponse": false}, "authentication": "genericCredentialType", "genericAuthType": "httpBasicAuth", "headerParametersUi": {"parameter": [{"name": "Accept", "value": "application/vnd.docker.distribution.manifest.v2+json"}]}}, "typeVersion": 2}, {"id": "f054b91e-abd4-4854-9bfa-e4a2b70f7e2c", "name": "Update Fields", "type": "n8n-nodes-base.set", "position": [60, -40], "parameters": {"options": {}, "assignments": {"assignments": [{"id": "c970bdb8-ddbf-486b-a716-c66274a248a7", "name": "name", "type": "string", "value": "={{ $('Filter Valid Tags').item.json.name }}"}, {"id": "7ce79761-6557-413c-a9a6-5d1ca564a3df", "name": "tag", "type": "string", "value": "={{ $('Filter Valid Tags').item.json.tag }}"}, {"id": "45948a25-d35c-4e3f-9556-3d52a1a89f80", "name": "created", "type": "string", "value": "={{ $json.created }}"}, {"id": "c73a14ad-91f6-477f-b4c3-037db319b9ee", "name": "digest", "type": "string", "value": "={{ $('Fetch Manifest Digest').item.json.headers['docker-content-digest'] }}"}]}}, "typeVersion": 3.4}, {"id": "54405505-8445-491a-8f5d-232da8c842d2", "name": "Group Tags by Image", "type": "n8n-nodes-base.code", "position": [420, -40], "parameters": {"jsCode": "const groupedData = items.reduce((acc, item) => {\n  const name = item.json.name;\n  if (!acc[name]) {\n    acc[name] = [];\n  }\n  acc[name].push({\n    tag: item.json.tag,\n    created: item.json.created,\n    digest: item.json.digest\n  });\n  return acc;\n}, {});\n\nreturn Object.keys(groupedData).map(name => ({\n  json: { name, tags: groupedData[name] }\n}));\n"}, "typeVersion": 2}, {"id": "980aab86-44cd-47d5-b3b7-42cbae26eb09", "name": "Sort by Creation Date", "type": "n8n-nodes-base.sort", "position": [240, -40], "parameters": {"options": {}, "sortFieldsUi": {"sortField": [{"order": "descending", "fieldName": "created"}]}}, "typeVersion": 1}, {"id": "0561efb9-4903-4bec-bc1a-8131e5f5de67", "name": "Send Failure Notification Email", "type": "n8n-nodes-base.emailSend", "position": [1120, 80], "webhookId": "47f852c3-7136-4e6d-92f6-47322dbba5da", "parameters": {"text": "=Image : {{ $json.image }}\nTag : {{ $json.tag.tag }}\n\nFailed", "options": {}, "subject": "[FAIL] Docker Registry Cleaner Notification", "toEmail": "to@example.com", "fromEmail": "from@example.com", "emailFormat": "text"}, "typeVersion": 2.1}, {"id": "eaa28914-351c-4934-ba1c-0d39faf67ef3", "name": "Execute Garbage Collection", "type": "n8n-nodes-base.ssh", "position": [1120, -100], "parameters": {"cwd": "/opt/services/", "command": "docker compose exec -it -u root registry bin/registry garbage-collect --delete-untagged /etc/docker/registry/config.yml", "authentication": "privateKey"}, "typeVersion": 1}], "pinData": {}, "connections": {"Split Tags": {"main": [[{"node": "Filter Valid Tags", "type": "main", "index": 0}]]}, "List Images": {"main": [[{"node": "Extract Image Names", "type": "main", "index": 0}]]}, "Update Fields": {"main": [[{"node": "Sort by Creation Date", "type": "main", "index": 0}]]}, "Remove Old Tags": {"main": [[{"node": "Execute Garbage Collection", "type": "main", "index": 0}], [{"node": "Send Failure Notification Email", "type": "main", "index": 0}]]}, "Filter Valid Tags": {"main": [[{"node": "Fetch Manifest Digest", "type": "main", "index": 0}]]}, "Scheduled Trigger": {"main": [[{"node": "List Images", "type": "main", "index": 0}]]}, "Extract Image Names": {"main": [[{"node": "Retrieve Image Tags", "type": "main", "index": 0}]]}, "Group Tags by Image": {"main": [[{"node": "Identify Tags to Remove", "type": "main", "index": 0}]]}, "Retrieve Image Tags": {"main": [[{"node": "Split Tags", "type": "main", "index": 0}]]}, "Fetch Manifest Digest": {"main": [[{"node": "Fetch Manifest Digest for Blob", "type": "main", "index": 0}]]}, "Sort by Creation Date": {"main": [[{"node": "Group Tags by Image", "type": "main", "index": 0}]]}, "Identify Tags to Remove": {"main": [[{"node": "Remove Old Tags", "type": "main", "index": 0}, {"node": "Send Notification Email", "type": "main", "index": 0}]]}, "Fetch Manifest Digest for Blob": {"main": [[{"node": "Update Fields", "type": "main", "index": 0}]]}}}