--- name: discovery-patterns-9bbd504f2eb8 description: Configure ServiceNow Discovery — schedules, IP ranges, credential affinities, MID Server assignment, custom probes/sensors, identification rules, and run-status monitoring on discovery_* tables. license: Apache-2.0 compatibility: Designed for Serac and ServiceNow development metadata: author: serac version: "1.0.0" category: servicenow tools: - snow_asset_discovery - snow_cmdb_search - snow_query_table - snow_execute_script --- # Discovery Patterns for ServiceNow Discovery automatically populates the CMDB by scanning networks and systems. ## Discovery Architecture ``` Discovery Schedule ↓ MID Server ↓ Probes (collect data) ↓ Sensors (process data) ↓ Identification Rules (match/create CIs) ↓ CMDB Population ``` ## Key Tables | Table | Purpose | | -------------------------- | --------------------- | | `discovery_schedule` | Discovery schedules | | `discovery_credentials` | Discovery credentials | | `discovery_range` | IP ranges to scan | | `cmdb_identification_rule` | CI identification | | `ecc_agent` | MID Server records | | `discovery_status` | Discovery run status | ## Discovery Schedules (ES5) ### Create Discovery Schedule ```javascript // Create discovery schedule (ES5 ONLY!) var schedule = new GlideRecord("discovery_schedule") schedule.initialize() // Basic info schedule.setValue("name", "Data Center Discovery") schedule.setValue("description", "Weekly discovery of data center infrastructure") // Type schedule.setValue("discover", "IP") // IP, CI, Cloud Resources // Schedule schedule.setValue("run_type", "weekly") schedule.setValue("run_dayofweek", "sunday") schedule.setValue("run_time", "02:00:00") // MID Server schedule.setValue("mid_server", getMIDServerSysId("DataCenterMID")) // Enable schedule.setValue("active", true) var scheduleSysId = schedule.insert() // Add IP range addDiscoveryRange(scheduleSysId, "10.0.0.0", "10.0.255.255", "Data Center Network") ``` ### Add Discovery Range ```javascript // Add IP range to discovery schedule (ES5 ONLY!) function addDiscoveryRange(scheduleSysId, startIP, endIP, name) { var range = new GlideRecord("discovery_range") range.initialize() range.setValue("schedule", scheduleSysId) range.setValue("name", name) range.setValue("type", "range") range.setValue("range_start", startIP) range.setValue("range_end", endIP) range.setValue("active", true) return range.insert() } // Add CIDR range function addDiscoveryCIDR(scheduleSysId, cidr, name) { var range = new GlideRecord("discovery_range") range.initialize() range.setValue("schedule", scheduleSysId) range.setValue("name", name) range.setValue("type", "cidr") range.setValue("range", cidr) // e.g., '10.0.0.0/24' range.setValue("active", true) return range.insert() } ``` ## Discovery Credentials (ES5) ### Create Credentials ```javascript // Create Windows credential (ES5 ONLY!) var cred = new GlideRecord("discovery_credentials") cred.initialize() cred.setValue("name", "Windows Domain Admin") cred.setValue("type", "windows") cred.setValue("user_name", "domain\\admin") cred.setValue("password", "") // Set via secure method cred.setValue("active", true) // Credential order cred.setValue("order", 100) // Assign to credential affinity cred.setValue("credential_alias", credentialAliasSysId) cred.insert() ``` ### Credential Affinity ```javascript // Create credential affinity (map credentials to IP ranges) (ES5 ONLY!) var affinity = new GlideRecord("dscy_credentials_affinity") affinity.initialize() affinity.setValue("credential", credentialSysId) affinity.setValue("range", discoveryRangeSysId) affinity.setValue("order", 100) affinity.insert() ``` ## Custom Probes and Sensors (ES5) ### Custom Probe ```javascript // Create custom probe script (ES5 ONLY!) // Probes run on MID Server to collect data // Table: discovery_probes_script var probe = new GlideRecord("discovery_probes_script") probe.initialize() probe.setValue("name", "Custom Application Version") probe.setValue("active", true) // Probe script (runs on MID Server - ES5 ONLY!) probe.setValue( "script", "var output = {};\n" + "\n" + "// Command to run\n" + 'var cmd = "cat /opt/myapp/version.txt";\n' + "\n" + "try {\n" + " var result = Packages.com.service_now.mid.probe.tpcon.OperatingSystemCommand.execute(cmd);\n" + " output.app_version = result.getOutput().trim();\n" + " output.success = true;\n" + "} catch (e) {\n" + " output.success = false;\n" + " output.error = e.message;\n" + "}\n" + "\n" + "output;", ) probe.insert() ``` ### Custom Sensor ```javascript // Create custom sensor (ES5 ONLY!) // Sensors run on ServiceNow instance to process probe results // Table: discovery_sensors_script var sensor = new GlideRecord("discovery_sensors_script") sensor.initialize() sensor.setValue("name", "Process Custom Application Version") sensor.setValue("active", true) sensor.setValue("probe", probeSysId) // Sensor script (runs on instance - ES5 ONLY!) sensor.setValue( "script", "(function process(result, source) {\n" + " var output = JSON.parse(result.output);\n" + " \n" + " if (!output.success) {\n" + ' gs.warn("Custom app discovery failed: " + output.error);\n' + " return;\n" + " }\n" + " \n" + " // Find or create CI\n" + " var ci = source.getDeviceRecord();\n" + " if (ci) {\n" + " ci.u_custom_app_version = output.app_version;\n" + " ci.update();\n" + ' gs.info("Updated CI with app version: " + output.app_version);\n' + " }\n" + "})(result, source);", ) sensor.insert() ``` ## Identification Rules (ES5) ### CI Identification Rule ```javascript // Create identification rule (ES5 ONLY!) var rule = new GlideRecord("cmdb_identifier") rule.initialize() rule.setValue("name", "Server Identification") rule.setValue("table", "cmdb_ci_server") rule.setValue("active", true) // Priority (lower = higher priority) rule.setValue("order", 100) // Identification entries (criteria) rule.insert() // Add identification criteria var entry = new GlideRecord("cmdb_identifier_entry") entry.initialize() entry.setValue("identifier", rule.getUniqueValue()) entry.setValue("criterion_attributes", "serial_number") // Match by serial entry.setValue("search_type", "equals") entry.setValue("active", true) entry.insert() ``` ### Custom Identification Script ```javascript // Identification script for complex matching (ES5 ONLY!) // Table: cmdb_identifier_script var script = new GlideRecord("cmdb_identifier_script") script.initialize() script.setValue("name", "Custom Server Match") script.setValue("table", "cmdb_ci_server") script.setValue("active", true) script.setValue( "script", "(function identify(source) {\n" + ' var serial = source.getValue("serial_number");\n' + ' var hostname = source.getValue("name");\n' + " \n" + " // Try serial match first\n" + ' var gr = new GlideRecord("cmdb_ci_server");\n' + " if (serial) {\n" + ' gr.addQuery("serial_number", serial);\n' + " gr.query();\n" + " if (gr.next()) {\n" + " return gr.getUniqueValue();\n" + " }\n" + " }\n" + " \n" + " // Try hostname + IP match\n" + ' gr = new GlideRecord("cmdb_ci_server");\n' + ' gr.addQuery("name", hostname);\n' + ' gr.addQuery("ip_address", source.getValue("ip_address"));\n' + " gr.query();\n" + " if (gr.next()) {\n" + " return gr.getUniqueValue();\n" + " }\n" + " \n" + " // No match - return null to create new CI\n" + " return null;\n" + "})(source);", ) script.insert() ``` ## Discovery Status (ES5) ### Monitor Discovery Status ```javascript // Check discovery run status (ES5 ONLY!) function getDiscoveryStatus(scheduleSysId) { var status = new GlideRecord("discovery_status") status.addQuery("dscheduler", scheduleSysId) status.orderByDesc("sys_created_on") status.setLimit(1) status.query() if (status.next()) { return { state: status.state.getDisplayValue(), started: status.getValue("started"), completed: status.getValue("completed"), devices_found: status.getValue("devices_found"), devices_completed: status.getValue("devices_completed"), errors: status.getValue("error_count"), } } return null } ``` ### Discovery Device Results ```javascript // Get discovered devices from a run (ES5 ONLY!) function getDiscoveredDevices(statusSysId) { var devices = [] var device = new GlideRecord("discovery_device_history") device.addQuery("status", statusSysId) device.query() while (device.next()) { devices.push({ ip_address: device.getValue("source"), ci: device.cmdb_ci.getDisplayValue(), ci_class: device.getValue("ci_type"), state: device.state.getDisplayValue(), issues: device.getValue("issue_count"), }) } return devices } ``` ## MCP Tool Integration ### Available Tools | Tool | Purpose | | ---------------------- | -------------------------------- | | `snow_query_table` | Query discovery tables | | `snow_artifact_manage` | Find artifacts (`action='find'`) | | `snow_execute_script` | Test discovery scripts | | `snow_cmdb_search` | Search discovered CIs | ### Example Workflow ```javascript // 1. Query active schedules await snow_query_table({ table: "discovery_schedule", query: "active=true", fields: "name,discover,run_type,mid_server", }) // 2. Check recent discovery status await snow_execute_script({ script: ` var status = getDiscoveryStatus('schedule_sys_id'); gs.info(JSON.stringify(status)); `, }) // 3. Find discovery errors await snow_query_table({ table: "discovery_log", query: "level=error^sys_created_on>=javascript:gs.daysAgo(1)", fields: "message,source,sys_created_on", }) ``` ## Best Practices 1. **Credential Security** - Use credential vault 2. **Schedule Off-Peak** - Minimize network impact 3. **Range Management** - Organize by network segment 4. **MID Server** - Proper placement and sizing 5. **Identification** - Clear matching criteria 6. **Reconciliation** - Regular CMDB validation 7. **Monitoring** - Track discovery health 8. **ES5 Only** - No modern JavaScript syntax --- Source attribution: serac Original project: https://github.com/groeimetai/snow-flow/blob/af3ad2b3c01305526a44b2647415ba794237462c/packages/skills/discovery-patterns/SKILL.md License: Apache-2.0 License information: https://www.apache.org/licenses/LICENSE-2.0 Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. # Mega AI Hub resource metadata Creator / publisher: serac Original project: https://github.com/groeimetai/snow-flow/blob/af3ad2b3c01305526a44b2647415ba794237462c/packages/skills/discovery-patterns/SKILL.md Attribution basis: Source repository record Fields of work: Sales, Customer Support, Operations Roles: Sales Development Rep (SDR), Customer Success Manager, Technical Support, Business Development, Operations Manager Specialties: Design, Word Documents, Testing, Backend Tools: Service Now Country applicability: Country not specified Classification basis: Source category, role and specialization labels Instruction SHA-256: 20ba93369c3fe73f07f49d6cdffc895bd2bcd11078d557d83c6a846681145307