https://offvendor.com/guides/ Hand-written, in-depth IT migration guides: licensing economics, real-world gotchas, tooling, and cutover strategy. en https://offvendor.com/ai-llms/ https://offvendor.com/ai-llms/ Moving high-volume workloads off OpenAI, Anthropic, or Gemini to self-hosted open-weight models (Llama, Mistral, DeepSeek) behind a gateway. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/ai-llms/azure-openai-to-llama/ https://offvendor.com/ai-llms/azure-openai-to-llama/ A practitioner's path from Azure OpenAI's per-token API to self-hosted open-weight Llama on vLLM behind an OpenAI-compatible endpoint, covering GPU sizing, quantization, throughput, prompt-level eval, and where the break-even actually lands. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/backup-dr/ https://offvendor.com/backup-dr/ Re-platforming off Veeam, Commvault, or NetBackup: re-protecting workloads, parallel runs, and proving restores before you switch. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/data-warehouse/bigquery-to-clickhouse/ https://offvendor.com/data-warehouse/bigquery-to-clickhouse/ A cost-driven move off BigQuery on-demand and slot pricing to ClickHouse, with Parquet export, dialect rewrites, and result validation. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cicd-devops/ https://offvendor.com/cicd-devops/ Moving off GitLab, Azure DevOps, or Bamboo to Gitea/Forgejo, Drone, Woodpecker, or Argo: repo mirroring and pipeline translation. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cicd-devops/circleci-to-woodpecker/ https://offvendor.com/cicd-devops/circleci-to-woodpecker/ Trade CircleCI's per-credit SaaS pricing for self-hosted, container-native Woodpecker CI, converting configs and orbs while taking on runner ops yourself. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud-onprem/ https://offvendor.com/cloud-onprem/ On-prem → cloud (adoption) and cloud → on-prem (repatriation): when each makes sense, native tooling, and the steady-state cost reality. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/containers-paas/cloud-foundry-to-kubernetes/ https://offvendor.com/containers-paas/cloud-foundry-to-kubernetes/ Migrate off Tanzu Application Service and its Broadcom licensing to upstream Kubernetes, rebuilding cf push velocity with buildpacks, Helm, and Ingress. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud/ https://offvendor.com/cloud/ Moving workloads between AWS, Azure, GCP, and OCI: native migration services, IaC re-platforming, egress, and DNS cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/containers-paas/ https://offvendor.com/containers-paas/ Leaving OpenShift, Tanzu, or Docker EE for upstream Kubernetes, Rancher/RKE2, or K3s: Velero-based moves and OpenShift-ism conversion. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/ https://offvendor.com/cybersecurity/ Security is not one buying decision. EDR/XDR, SIEM, SOAR, MDR/MSSP, NDR, vulnerability management, and threat intel each bill on a different meter and each fail differently at renewal. What changes per segment, and what stays constant. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/data-warehouse/ https://offvendor.com/data-warehouse/ Moving off Snowflake, Teradata, or BigQuery to ClickHouse, Trino, or DuckDB: open formats, SQL conversion, and reconciliation. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/ https://offvendor.com/databases/ Moving off Oracle, SQL Server, or other commercial databases: licensing economics, schema/SQL conversion, and low-downtime cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/firewalls/ https://offvendor.com/firewalls/ Replacing Palo Alto, Fortinet, Check Point, Cisco, or SonicWall with OPNsense or pfSense: rulebase export, VPN/IPS, and per-site cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud/gcp-to-aws/ https://offvendor.com/cloud/gcp-to-aws/ Moving from GCP to AWS for consolidation, commercial terms, or ecosystem reach: service mapping, data transfer tooling, IAM and network rebuild, the egress cost gotcha, and why the savings come from commitments, not the move itself. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/storage-san/hpe-alletra-to-ceph/ https://offvendor.com/storage-san/hpe-alletra-to-ceph/ Trading a proprietary all-flash array for software-defined Ceph: the appliance-to-cluster mindset shift, OSD and replication sizing, host-level data migration, and the latency realities that decide whether this is a good idea. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iac-secrets/ https://offvendor.com/iac-secrets/ After HashiCorp's BSL change: moving Terraform→OpenTofu and Vault→OpenBao with compatible state/secret backends and no-op plans. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iam/ https://offvendor.com/iam/ Replacing Okta, Entra ID, or Ping with Keycloak, Authentik, or Zitadel: directory sync, app re-federation, MFA, and per-app cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/arctic-wolf-to-in-house-soc/ https://offvendor.com/cybersecurity/arctic-wolf-to-in-house-soc/ Ending a concierge MDR contract is a staffing decision before it is a tooling one: modelling the real cost of a 24x7 rota, extracting tuned detections while the contract is live, building the open stack, and shadowing the provider for a full quarter. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/secureworks-taegis-to-in-house-soc/ https://offvendor.com/cybersecurity/secureworks-taegis-to-in-house-soc/ Insourcing from a platform-plus-service MDR: separating the Taegis platform from the analyst service, extracting investigation history before notice, rebuilding detection content on your own SIEM, and deciding whether consolidation is a reason to leave or to stay. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/load-balancers/ https://offvendor.com/load-balancers/ Replacing F5, Citrix NetScaler, Kemp, or A10 with HAProxy, NGINX, or Traefik: translating rules, TLS, and swinging traffic safely. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/messaging/ https://offvendor.com/messaging/ Moving off Confluent, IBM MQ, or TIBCO to Apache Kafka, RabbitMQ, NATS, or Pulsar: bridging, repointing clients, and draining safely. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/networking/arista-to-sonic/ https://offvendor.com/networking/arista-to-sonic/ Move off Arista per-device and subscription costs to open-source SONiC on supported whitebox switches: validate the HCL, translate EOS BGP/EVPN-VXLAN and MLAG into config_db.json plus FRR, lab the fabric, and cut over per switch with a rollback image. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/load-balancers/a10-thunder-to-haproxy/ https://offvendor.com/load-balancers/a10-thunder-to-haproxy/ Drop per-instance A10 Thunder ADC licensing and rebuild your virtual servers, health monitors, SSL termination, and aFleX logic as version-controlled HAProxy config with keepalived HA. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/data-warehouse/redshift-to-clickhouse/ https://offvendor.com/data-warehouse/redshift-to-clickhouse/ Moving analytics off provisioned Redshift to ClickHouse, UNLOAD-to-Parquet ingestion, rethinking sort/dist keys as ORDER BY, the SQL-dialect rewrite, and where Redshift still wins. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/api-management/apigee-to-apisix/ https://offvendor.com/api-management/apigee-to-apisix/ Reproducing Apigee API proxies as APISIX routes and upstreams, translating Quota, Spike Arrest, OAuthV2, and transform policies to APISIX plugins, and moving the developer portal and analytics off Apigee. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/api-management/apigee-to-kong-oss/ https://offvendor.com/api-management/apigee-to-kong-oss/ Re-implementing Apigee API proxies as Kong services and routes, mapping Quota, Spike Arrest, OAuthV2, and transform policies to Kong plugins, and replacing the Apigee portal and analytics with open equivalents. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cicd-devops/bamboo-to-drone/ https://offvendor.com/cicd-devops/bamboo-to-drone/ Leaving Bamboo (Server/Data Center EOL) for Drone CI, converting build plans to container-native pipelines, migrating repos and agents, and cutting over by project. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud/aws-to-azure/ https://offvendor.com/cloud/aws-to-azure/ Moving workloads from AWS to Azure, why the managed-service layer (not the VMs) is the hard part, the native migration tooling, egress reality, and a landing-zone-first cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud-onprem/aws-to-on-premise/ https://offvendor.com/cloud-onprem/aws-to-on-premise/ Repatriating steady-state workloads from AWS to on-prem/private cloud, the cost case, what's hard to bring back, exporting/replicating VMs and data, and DNS cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/carbon-black-to-elastic-security/ https://offvendor.com/cybersecurity/carbon-black-to-elastic-security/ Leaving Broadcom-era Carbon Black for Elastic Security: why Elastic Defend is one of the few open destinations with actual endpoint prevention, translating watchlists and reputation policy into detection rules, and sizing the Elasticsearch cluster you now own. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/centos-to-almalinux/ https://offvendor.com/operating-systems/centos-to-almalinux/ AlmaLinux as the CentOS replacement, the almalinux-deploy converter, using ELevate to cross a major version from CentOS 7, and how to choose between Alma and Rocky. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/centos-to-rocky-linux/ https://offvendor.com/operating-systems/centos-to-rocky-linux/ CentOS Linux 7 and 8 are both EOL. Here's the realistic path to Rocky, in-place migrate2rocky for CentOS 8, why CentOS 7 is a different problem, and how to do it without an unplanned outage. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/firewalls/checkpoint-to-opnsense/ https://offvendor.com/firewalls/checkpoint-to-opnsense/ Leaving Check Point's per-gateway-plus-blades licensing for open-source OPNsense, why there's no clean importer, how to translate the rule base safely, and where OPNsense fits (and doesn't). Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/networking/cisco-catalyst-to-sonic/ https://offvendor.com/networking/cisco-catalyst-to-sonic/ Moving the data-center fabric off Cisco to SONiC, the HCL gate that decides feasibility, converting IOS configs, lab validation, and a pod-by-pod cutover with rollback ready. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/networking/cisco-catalyst-to-vyos/ https://offvendor.com/networking/cisco-catalyst-to-vyos/ Moving routing/edge off Cisco to VyOS, where VyOS fits versus SONiC, translating IOS to set-style config, lab staging, and per-site cutover with rollback. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/vdi-euc/citrix-daas-to-guacamole/ https://offvendor.com/vdi-euc/citrix-daas-to-guacamole/ When leaving Citrix DaaS for Apache Guacamole makes sense, what a clientless HTML5 gateway does and does not replace, and how to scope the move without pretending you bought a VDI broker. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/vdi-euc/citrix-daas-to-kasm/ https://offvendor.com/vdi-euc/citrix-daas-to-kasm/ How Kasm Workspaces streams containerized apps and desktops to the browser, where it lines up against Citrix DaaS, and how to map published apps to workspaces without overstating parity. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/load-balancers/citrix-adc-to-nginx/ https://offvendor.com/load-balancers/citrix-adc-to-nginx/ Replacing NetScaler ADC with NGINX, translating vServers and policies to server/upstream config, migrating TLS, sizing for SSL, and a per-VIP traffic swing. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/backup-dr/commvault-to-bacula/ https://offvendor.com/backup-dr/commvault-to-bacula/ Leaving Commvault's licensing for open-source Bacula, translating CommCell subclients into Bacula jobs, the retention-overlap rule, and why backup migrations are never a flag day. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/messaging/confluent-to-kafka/ https://offvendor.com/messaging/confluent-to-kafka/ Moving off Confluent to self-managed Apache Kafka (KRaft), what Confluent's value-add actually is, MirrorMaker 2 bridging, repointing clients, and draining lag before cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/corelight-to-zeek/ https://offvendor.com/cybersecurity/corelight-to-zeek/ The shortest exit in security: Corelight is packaged Zeek, so the logs and scripts carry over unchanged. What you actually give up is sensor engineering, curated Suricata content, enrichment, and support, and this guide is mostly about pricing those honestly. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/xsoar-to-shuffle/ https://offvendor.com/cybersecurity/xsoar-to-shuffle/ Leaving a per-seat, per-automation SOAR for open-source Shuffle: auditing which playbooks earn their licence, rebuilding content-pack integrations against the same vendor APIs, re-issuing every credential, and shadow-running before you grant containment permissions. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/crowdstrike-to-wazuh/ https://offvendor.com/cybersecurity/crowdstrike-to-wazuh/ Replacing CrowdStrike with self-hosted Wazuh, what an open XDR/SIEM does and doesn't cover, ringed agent rollout, recreating detections, and dual-running so you never lose visibility. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/darktrace-to-security-onion/ https://offvendor.com/cybersecurity/darktrace-to-security-onion/ Leaving appliance-and-subscription NDR for an open stack: why unsupervised anomaly detection has no open equivalent, rebuilding coverage as explicit Zeek scripts and Suricata signatures, reusing the existing TAP infrastructure, and comparing detections on identical traffic. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/datadog-to-prometheus/ https://offvendor.com/monitoring/datadog-to-prometheus/ How to replace Datadog with a self-hosted Prometheus + Grafana stack, what maps cleanly, what doesn't, and how to run both in parallel before you cut over. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/datadog-to-grafana/ https://offvendor.com/monitoring/datadog-to-grafana/ Replacing Datadog with Grafana + Mimir + Loki + Tempo, why this is the nearest single-pane swap, OpenTelemetry instrumentation, and self-host vs Grafana Cloud. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/storage-san/dell-powerstore-to-ceph/ https://offvendor.com/storage-san/dell-powerstore-to-ceph/ Leaving PowerStore for Ceph, when unified scale-out storage fits (and when it doesn't), the RBD/CephFS/RGW mapping, data migration, and operating-cost reality. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/dynatrace-to-grafana/ https://offvendor.com/monitoring/dynatrace-to-grafana/ Leaving Dynatrace's consumption pricing for the open Grafana stack, replacing OneAgent with OpenTelemetry, rebuilding metrics/logs/traces on Mimir/Loki/Tempo, and what Davis AI you give up. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/load-balancers/f5-bigip-to-haproxy/ https://offvendor.com/load-balancers/f5-bigip-to-haproxy/ Replacing F5 BIG-IP with HAProxy, translating Virtual Servers and iRules to frontends/backends and ACLs, migrating TLS and health checks, sizing for SSL TPS, and swinging traffic safely. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iam/forgerock-to-keycloak/ https://offvendor.com/iam/forgerock-to-keycloak/ Leaving ForgeRock enterprise per-user pricing for self-hosted Keycloak, modelling realms and clients, translating journeys to authentication flows, federating the directory, and migrating password hashes without a flag day. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/firewalls/fortinet-to-opnsense/ https://offvendor.com/firewalls/fortinet-to-opnsense/ Replacing FortiGate with OPNsense, which FortiGate features map (and which don't), rebuilding policies and VPNs, sizing for inspected throughput, and per-site cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cicd-devops/gitlab-to-gitea/ https://offvendor.com/cicd-devops/gitlab-to-gitea/ Leaving GitLab Premium/Ultimate for self-hosted Gitea or Forgejo, mirroring repos, translating CI pipelines (the real work), migrating issues via API, and cutting over team by team. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iac-secrets/terraform-to-opentofu/ https://offvendor.com/iac-secrets/terraform-to-opentofu/ Why OpenTofu exists, why the switch is mostly a CI/CD and version-pinning exercise, and the state, registry, and version-drift details to get right. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iac-secrets/vault-to-openbao/ https://offvendor.com/iac-secrets/vault-to-openbao/ Why OpenBao exists, why it's a near drop-in for Vault, and the storage-backend, unseal-key, and client-repointing details to get right. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/db2-to-postgresql/ https://offvendor.com/databases/db2-to-postgresql/ Moving off Db2's PVU-based licensing to PostgreSQL, the schema and SQL PL conversion, where AWS SCT helps, and the parallel-run cutover that keeps production safe. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/messaging/ibm-mq-to-rabbitmq/ https://offvendor.com/messaging/ibm-mq-to-rabbitmq/ Moving classic queueing off IBM MQ to RabbitMQ, mapping queues to exchanges, bridging during transition, repointing apps via AMQP, and preserving delivery semantics. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/qradar-to-wazuh/ https://offvendor.com/cybersecurity/qradar-to-wazuh/ Replacing an appliance-based, events-per-second-licensed SIEM with self-hosted Wazuh: translating DSMs into decoders, AQL rules into rule sets, reference sets into CDB lists, and handling the flow-analytics capability QRadar has and Wazuh does not. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cicd-devops/jenkins-to-woodpecker/ https://offvendor.com/cicd-devops/jenkins-to-woodpecker/ Trading Jenkins' plugin maintenance and Groovy pipelines for container-native Woodpecker CI, converting pipelines to YAML, replacing plugins with steps, and migrating without freezing delivery. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/networking/juniper-to-vyos/ https://offvendor.com/networking/juniper-to-vyos/ Moving edge and routing workloads off per-device Juniper licensing to open-source VyOS, translating Junos config, where VyOS fits (and where it does not), and a per-site cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/load-balancers/kemp-to-haproxy/ https://offvendor.com/load-balancers/kemp-to-haproxy/ Leaving Kemp's per-instance plus support licensing for open-source HAProxy, translating Virtual Services to frontends and backends, handling TLS and persistence, and a per-VIP cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/api-management/kong-ee-to-kong-oss/ https://offvendor.com/api-management/kong-ee-to-kong-oss/ Why moving from Kong Enterprise to Kong Gateway OSS is the lowest-effort API-management migration, and how to replace the Enterprise-only pieces, RBAC, Dev Portal, and Vitals, with open equivalents. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud/azure-to-aws/ https://offvendor.com/cloud/azure-to-aws/ Moving workloads from Azure to AWS, why managed services (not VMs) are the hard part, AWS MGN/DMS tooling, egress and licensing reality, and a landing-zone-first cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iam/entra-id-to-keycloak/ https://offvendor.com/iam/entra-id-to-keycloak/ Moving app SSO from Entra ID to Keycloak, what you can and can't replace, AD federation, conditional-access-to-auth-flow mapping, and a per-app cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/microsoft-sentinel-to-graylog/ https://offvendor.com/cybersecurity/microsoft-sentinel-to-graylog/ Why the answer to a Sentinel bill is usually tiering rather than leaving: splitting log sources by value, moving high-volume low-signal data to self-hosted Graylog, rebuilding KQL analytics as pipeline rules, and keeping the Microsoft-native telemetry where it is cheapest. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/sql-server-to-postgresql/ https://offvendor.com/databases/sql-server-to-postgresql/ What it takes to move SQL Server to PostgreSQL, the licensing economics, T-SQL conversion, where Babelfish removes the app rewrite, and how to cut over safely. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/containers-paas/docker-ee-to-kubernetes/ https://offvendor.com/containers-paas/docker-ee-to-kubernetes/ Leaving the per-node MKE/UCP subscription for vanilla Kubernetes, converting Swarm and compose workloads, and standing up a conformant cluster without a delivery freeze. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/api-management/mulesoft-to-kong-oss/ https://offvendor.com/api-management/mulesoft-to-kong-oss/ Why only the API-management layer of MuleSoft Anypoint maps to Kong Gateway OSS, how to keep Mule integration flows on their own track, and how to re-implement the gateway with Kong plugins. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/storage-san/netapp-ontap-to-truenas/ https://offvendor.com/storage-san/netapp-ontap-to-truenas/ Leaving ONTAP for TrueNAS, mapping SVMs, volumes, and snapshots to ZFS, sizing for IOPS not just capacity, and migrating LUNs and shares without data loss. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/new-relic-to-prometheus/ https://offvendor.com/monitoring/new-relic-to-prometheus/ Moving New Relic APM to Prometheus + OpenTelemetry + Tempo, why per-user pricing drives the move, re-instrumentation, NRQL-to-PromQL, and dual-running. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iam/okta-to-keycloak/ https://offvendor.com/iam/okta-to-keycloak/ Replacing Okta with self-hosted Keycloak, realm and client mapping, directory federation, and the password and MFA migration realities that make or break the cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/vdi-euc/vmware-horizon-to-guacamole/ https://offvendor.com/vdi-euc/vmware-horizon-to-guacamole/ Replacing the Horizon broker and clients with Apache Guacamole's HTML5 gateway to existing RDP hosts, what carries over, what does not, and how to plan image and profile work separately. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cloud-onprem/on-premise-to-aws/ https://offvendor.com/cloud-onprem/on-premise-to-aws/ Moving on-prem workloads to AWS, the 6 Rs decision, landing zone and connectivity, AWS MGN/DMS replication, and the steady-state cost reality that sometimes argues for staying put. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/ai-llms/openai-gpt-to-mistral/ https://offvendor.com/ai-llms/openai-gpt-to-mistral/ Moving LLM workloads from OpenAI to Mistral, self-host open weights or use Mistral's API, the OpenAI-compatible gateway, eval-driven A/B, and the European data angle. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/ai-llms/openai-gpt-to-llama/ https://offvendor.com/ai-llms/openai-gpt-to-llama/ Moving high-volume LLM workloads off the OpenAI API to self-hosted Llama, the OpenAI-compatible gateway that keeps app code stable, GPU sizing, eval-driven A/B, and gradual traffic shift. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/arcsight-to-graylog/ https://offvendor.com/cybersecurity/arcsight-to-graylog/ Leaving a legacy correlation SIEM: mining ESM rules that still fire, replacing SmartConnectors with native inputs, reading CEF directly into Graylog, converting active lists to lookup tables, and handling the institutional knowledge nobody documented. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/oracle-to-aurora/ https://offvendor.com/databases/oracle-to-aurora/ Moving Oracle to Aurora (PostgreSQL-compatible), what AWS SCT and DMS automate, the PL/SQL conversion that remains, and the managed-vs-lock-in trade-off. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/oracle-to-mysql/ https://offvendor.com/databases/oracle-to-mysql/ When MySQL (not PostgreSQL) is the right Oracle exit, the workload fit, PL/SQL-to-stored-procedure conversion, tooling, and the ownership caveat. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/oracle-to-postgresql/ https://offvendor.com/databases/oracle-to-postgresql/ A realistic look at Oracle→PostgreSQL: licensing economics, what ora2pg does and doesn't automate, PL/SQL conversion, and how to de-risk cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/oracle-linux-to-almalinux/ https://offvendor.com/operating-systems/oracle-linux-to-almalinux/ Oracle Linux to AlmaLinux is a near-mechanical move between RHEL rebuilds. The almalinux-deploy converter, the UEK kernel switch, ELevate for OL7, and choosing Alma over Rocky. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/oracle-linux-to-rocky-linux/ https://offvendor.com/operating-systems/oracle-linux-to-rocky-linux/ Oracle Linux is already a RHEL rebuild, so moving to Rocky is low-effort. The catch is the UEK kernel and the support-subscription dependencies, here is how to leave cleanly. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/cortex-xdr-to-wazuh/ https://offvendor.com/cybersecurity/cortex-xdr-to-wazuh/ Leaving an XDR billed on endpoints and ingested data at the same time: unpicking which telemetry earns its cost, re-expressing BIOCs and XQL as Wazuh rules, keeping a prevention layer Wazuh does not provide, and running rings without a coverage gap. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/firewalls/palo-alto-to-opnsense/ https://offvendor.com/firewalls/palo-alto-to-opnsense/ Replacing Palo Alto with OPNsense, where an open firewall fits (and where App-ID/WildFire don't translate), rebuilding the rulebase and VPNs, sizing with TLS inspection in mind, and per-site cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iam/ping-identity-to-keycloak/ https://offvendor.com/iam/ping-identity-to-keycloak/ Moving off Ping's per-user-plus-modules pricing to open-source Keycloak, realm and client modelling, the password-hash problem, and how to migrate relying parties without a flag-day cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/storage-san/pure-flasharray-to-ceph/ https://offvendor.com/storage-san/pure-flasharray-to-ceph/ Moving off Pure's FlashArray appliances to open-source Ceph, the appliance-vs-cluster mindset shift, host-level data migration, performance realities, and where Pure is still the right call. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/qualys-vmdr-to-greenbone/ https://offvendor.com/cybersecurity/qualys-vmdr-to-greenbone/ Leaving a per-asset, per-module platform: why the agent estate is the migration rather than the scanner, translating QID findings to CVEs, exporting the history that does not travel, and deciding which VMDR modules you were actually using. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/rhel-to-almalinux/ https://offvendor.com/operating-systems/rhel-to-almalinux/ RHEL to AlmaLinux, how AlmaLinux differs from Rocky in governance, the almalinux-deploy in-place conversion, and what you trade in support. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/rhel-to-rocky-linux/ https://offvendor.com/operating-systems/rhel-to-rocky-linux/ RHEL to Rocky Linux without drama, why the rebuilds exist, the in-place migrate2rocky path vs reprovisioning, and what you actually trade away in support. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/containers-paas/openshift-to-kubernetes/ https://offvendor.com/containers-paas/openshift-to-kubernetes/ Leaving OpenShift's per-core subscription for vanilla Kubernetes, mapping Routes, BuildConfigs, and SCCs to CNCF equivalents, and the security-model shift to plan for. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/sentinelone-to-wazuh/ https://offvendor.com/cybersecurity/sentinelone-to-wazuh/ Replacing SentinelOne with self-hosted Wazuh, the autonomous-EDR capability gap to plan for, ringed agent rollout, recreating detections, and dual-running. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/data-warehouse/snowflake-to-clickhouse/ https://offvendor.com/data-warehouse/snowflake-to-clickhouse/ Moving analytical workloads off Snowflake to ClickHouse, where ClickHouse wins (and where it doesn't), Parquet as the bridge, SQL-dialect conversion, and reconciliation-based cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/solarwinds-to-zabbix/ https://offvendor.com/monitoring/solarwinds-to-zabbix/ Leaving SolarWinds module licensing and post-SUNBURST trust concerns for Zabbix, mapping nodes and interfaces to hosts and templates, recreating triggers and dashboards, and scaling distributed sites with proxies. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/firewalls/sonicwall-to-opnsense/ https://offvendor.com/firewalls/sonicwall-to-opnsense/ Leave SonicWall appliance plus security-service subscriptions behind and rebuild the policy by hand in OPNsense: address and service objects, ordered rules, NAT, VPNs to IPsec/OpenVPN/WireGuard, VLANs, and Suricata IDS, with a parallel-run cutover per segment. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/splunk-es-to-wazuh/ https://offvendor.com/cybersecurity/splunk-es-to-wazuh/ Leaving an ingest-priced SIEM for a self-hosted one: auditing which sourcetypes actually earn their keep, rewriting SPL correlation searches as Wazuh rules, sizing the indexer, and parallel-ingesting until detection coverage is proven. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/splunk-soar-to-stackstorm/ https://offvendor.com/cybersecurity/splunk-soar-to-stackstorm/ Replacing Phantom-lineage SOAR with event-driven StackStorm: converting visual playbooks to Orquesta workflows, rebuilding apps as packs, replacing prompts with inquiries, and accepting that StackStorm is an automation engine with no security opinions. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/splunk-to-grafana/ https://offvendor.com/monitoring/splunk-to-grafana/ Replacing Splunk with Grafana + Loki, the index-light cost model, the SPL-to-LogQL mindset shift, label-cardinality discipline, and the premium apps with no OSS equal. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/suse-linux-to-rocky-linux/ https://offvendor.com/operating-systems/suse-linux-to-rocky-linux/ Unlike the RHEL-rebuild migrations, SUSE to Rocky is a genuine distro-family change, no in-place converter, zypper to dnf, AutoYaST to kickstart. Here is how to do it without surprises. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/symantec-endpoint-to-wazuh/ https://offvendor.com/cybersecurity/symantec-endpoint-to-wazuh/ Leaving Broadcom-owned Symantec endpoint licensing for open-source Wazuh, what Wazuh does and does not replace, mapping policies to rulesets, and a parallel-agent rollout. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/tenable-io-to-greenbone/ https://offvendor.com/cybersecurity/tenable-io-to-greenbone/ Replacing a per-asset commercial scanner with Greenbone: why the community feed lag is the real decision, recreating credentialed scan configs, mapping plugin IDs to CVEs rather than OIDs, and reconciling both scanners before compliance evidence depends on the new numbers. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/data-warehouse/teradata-to-clickhouse/ https://offvendor.com/data-warehouse/teradata-to-clickhouse/ Modernizing off Teradata to ClickHouse, extracting with TPT to open formats, converting BTEQ/SQL, the workload fit, and reconciliation-based cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/threatconnect-to-opencti/ https://offvendor.com/cybersecurity/threatconnect-to-opencti/ STIX 2.1 makes threat intel the most portable part of security: exporting indicators and relationships, re-subscribing TAXII feeds directly, rebuilding playbooks as connectors, and being honest about the scoring history and analyst annotations that do not survive. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/messaging/tibco-ems-to-rabbitmq/ https://offvendor.com/messaging/tibco-ems-to-rabbitmq/ Leaving TIBCO EMS licensing for open-source RabbitMQ, the JMS-to-AMQP mapping, the JMS-client shortcut vs a clean refactor, and bridging both brokers during cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/cybersecurity/trendmicro-to-wazuh/ https://offvendor.com/cybersecurity/trendmicro-to-wazuh/ Leaving Trend Micro Apex One licensing for open-source Wazuh, with the honest caveat that Wazuh is detection and XDR, not signature AV, so you pair it with OS-native prevention and plan indexer capacity before you scale. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/backup-dr/veeam-to-proxmox-backup-server/ https://offvendor.com/backup-dr/veeam-to-proxmox-backup-server/ Moving VM backups from Veeam to Proxmox Backup Server, why backups are re-baselined rather than copied, the dedup/immutability story, and how to prove restores before you switch. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/backup-dr/veritas-netbackup-to-bacula/ https://offvendor.com/backup-dr/veritas-netbackup-to-bacula/ Replacing NetBackup with open-source Bacula, translating policies to Bacula jobs, the daemon architecture, re-baselining, and proving restores before you cut over. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/containers-paas/tanzu-to-kubernetes/ https://offvendor.com/containers-paas/tanzu-to-kubernetes/ Leaving Tanzu for vanilla Kubernetes, what Tanzu layered on top, picking a distribution, Velero-based workload migration, and the vSphere-coupling to unwind. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/vmware-to-hyper-v/ https://offvendor.com/virtualization/vmware-to-hyper-v/ Leaving vSphere for Hyper-V, the Windows Server Datacenter licensing angle, vCenter-to-SCVMM mapping, the Gen1/Gen2 trap, and how to run the V2V without a blue screen. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/vmware-to-nutanix-ahv/ https://offvendor.com/virtualization/vmware-to-nutanix-ahv/ Leaving vSphere for Nutanix AHV, why the hypervisor is free, the Prism/vSAN mapping, the agentless Nutanix Move V2V, and the hardware reality to plan for. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/vmware-to-proxmox/ https://offvendor.com/virtualization/vmware-to-proxmox/ What actually changes when you leave vSphere for Proxmox VE, licensing, storage, networking, HA, backup, and the migration mechanics that trip teams up. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/vmware-to-xcp-ng/ https://offvendor.com/virtualization/vmware-to-xcp-ng/ XCP-ng + Xen Orchestra as a vCenter-style alternative to vSphere, pool and storage mapping, the built-in warm V2V import, and where Vates support fits. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/windows-server-to-ubuntu/ https://offvendor.com/operating-systems/windows-server-to-ubuntu/ Windows Server to Ubuntu removes per-core licensing and CALs, but it is a re-platform, not an OS swap. Which workloads move cleanly, which do not, and how to map the dependencies. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/xenserver-to-xcp-ng/ https://offvendor.com/virtualization/xenserver-to-xcp-ng/ XCP-ng is an open-source fork of the same Xen platform, so this is one of the gentlest hypervisor migrations, Xen Orchestra warm migration, XVA export, and what you give up leaving Citrix. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/databases/mongodb-to-postgresql/ https://offvendor.com/databases/mongodb-to-postgresql/ Why teams leave MongoDB for PostgreSQL, how to model documents into relational tables or JSONB, and where Mongo still wins. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/monitoring/ https://offvendor.com/monitoring/ Replacing Datadog, Splunk, New Relic, or SolarWinds with open stacks (Prometheus/Grafana/Loki), what maps, what doesn't, and how to dual-run. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/operating-systems/ https://offvendor.com/operating-systems/ Moving off RHEL, Windows Server, or SUSE to Rocky, AlmaLinux, Ubuntu, or Debian: in-place conversion vs reprovision, and validation. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/iac-secrets/puppet-to-ansible/ https://offvendor.com/iac-secrets/puppet-to-ansible/ Move off per-node Puppet Enterprise licensing to agentless Ansible, translating manifests and Hiera to playbooks and group_vars without losing enforcement. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/api-management/ https://offvendor.com/api-management/ How to think about leaving Apigee, MuleSoft, or Kong Enterprise for an open gateway, what maps cleanly, and the one distinction that decides how hard the migration is. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/backup-dr/rubrik-to-bacula/ https://offvendor.com/backup-dr/rubrik-to-bacula/ How to migrate from Rubrik subscription appliances to open-source Bacula, run both through the full retention window, and protect the catalog. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/messaging/solace-to-rabbitmq/ https://offvendor.com/messaging/solace-to-rabbitmq/ How to move queue and topic workloads off Solace PubSub+ onto open-source RabbitMQ, mapping topic hierarchies to exchanges and bindings, repointing apps over AMQP or JMS, and validating ordering, persistence, and HA before cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/storage-san/ https://offvendor.com/storage-san/ Moving off Dell, NetApp, or Pure to software-defined/open storage (TrueNAS, Ceph, MinIO): data migration, performance, and cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/networking/ https://offvendor.com/networking/ Moving off Cisco, Juniper, or Arista to open network OSes (SONiC, VyOS, FRRouting): HCL validation, config conversion, and pod-by-pod cutover. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/vdi-euc/ https://offvendor.com/vdi-euc/ How to think about replacing per-user VDI licensing with open remote-access and workspace-streaming tools, and where those tools genuinely fit versus where they don't. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/ https://offvendor.com/virtualization/ Leaving VMware (or any hypervisor): how to choose a target, map vSphere concepts, and migrate VMs without surprises. Thu, 01 Jan 2026 00:00:00 GMT https://offvendor.com/virtualization/vmware-to-openstack/ https://offvendor.com/virtualization/vmware-to-openstack/ How a large enterprise moves off Broadcom-era VMware vSphere onto self-run OpenStack: virt-v2v conversions, Neutron and Cinder mapping, flavors, and the operational reality of running an IaaS. Thu, 01 Jan 2026 00:00:00 GMT