This article is based on reporting originally published at searchitoperations.techtarget.com, covering HashiCorp’s announcements at HashiConf in Seattle.
HashiCorp Brings Managed Consul to Microsoft Azure
Microsoft Azure users can now access a hosted version of the HashiCorp Consul service mesh through HashiCorp Consul Service on Azure (HCS), announced at HashiConf in Seattle. The partnership between the two companies expands a pre-existing relationship and positions Consul’s multi-platform capabilities as a key differentiator in the increasingly crowded service mesh market.
HCS automatically provisions clusters running Consul service discovery and service mesh software within Azure. HashiCorp site reliability engineers manage the underlying infrastructure, but the service is billed through Azure and provisioned via the Azure console and the Azure Managed Applications service catalog — making it operationally familiar for Azure-native teams.
What Is a Service Mesh and Why Does It Matter?
A service mesh is a dedicated infrastructure layer for handling service-to-service communication within a microservices architecture. Instead of embedding network logic inside application code, a service mesh uses sidecar proxies deployed alongside each service instance to manage, observe, and secure traffic between services.
Key capabilities a service mesh typically provides include:
- Service discovery: Dynamically locating service instances as they scale up or down.
- Traffic management: Load balancing, retries, timeouts, and circuit breaking.
- Mutual TLS (mTLS): Encrypting and authenticating service-to-service connections automatically.
- Observability: Collecting metrics, traces, and logs at the network level without application changes.
Consul’s distinctive claim is that it handles not just Kubernetes-orchestrated containers but also traditional VMs and bare-metal hosts — a critical capability for enterprises running heterogeneous infrastructure. The Consul Connect gateway, released prior to these announcements, enables encrypted cross-cluster and cross-region connectivity across public cloud and on-premises deployments.
The Service Mesh Interoperability Problem
The service mesh landscape in 2019 included several competing control planes — most notably HashiCorp Consul, Google and IBM’s open source Istio, and Buoyant’s Linkerd — each with overlapping but distinct capabilities. Most of them share the same data plane: the Envoy proxy, developed at Lyft and now a CNCF graduated project. Sharing a common data plane makes technical differentiation between control planes increasingly difficult over time.
For enterprises running mixed environments — legacy applications on bare metal alongside cloud-native microservices, or workloads spread across multiple Kubernetes clusters and cloud regions — the inability of these meshes to interoperate is a genuine operational problem.
John Mitchell, formerly chief platform architect at SAP Ariba and an independent digital transformation consultant who has contracted with HashiCorp, summed up the challenge plainly:
“The only way out is to get these different mesh software stacks to interoperate. They’re all realizing they can’t try to be the big dog all by themselves, because it’s a networking problem. Standardization of that interconnect, that basic interoperability, is the only way forward — or they all fail.”
Mitchell also noted that multi-cluster deployments are already a reality for most serious container users:
“Nobody who’s serious about containers in production has just one Kubernetes cluster. Directionally, multiplatform interoperability is where everybody has to go, whether they realize it yet or not.”
Service Mesh Interface (SMI): A Common API Layer
Alongside the HCS announcement, Microsoft and HashiCorp highlighted their collaboration on the Service Mesh Interface (SMI), released in May 2019. SMI defines a set of standard Kubernetes APIs intended to work across multiple service mesh implementations, including Consul, Istio, and Linkerd.
The goal of SMI is to allow platform teams to build tooling and policies against a stable API surface without being locked into a single mesh vendor. For DevOps engineers, this means:
- Traffic policies and access controls can be written once and applied across mesh implementations.
- Observability integrations (dashboards, alert rules) do not need to be rebuilt when switching or combining mesh providers.
- Platform tooling and GitOps pipelines can target a common spec rather than vendor-specific CRDs.
Where Consul Stands Competitively
At the time of these announcements, Consul held a practical edge over Istio in two areas: the maturity of its inter-cluster gateway (Consul Connect) and its ability to orchestrate VMs and bare-metal workloads alongside Kubernetes containers. Istio Gateway and Istio Multicluster projects were both emerging at that time, and VM integration was still in development.
Linkerd had arguably the strongest production credentials among the three, particularly for VM-based service mesh orchestration.
Tom Petrocelli, an analyst at Amalgam Insights, offered a longer-term perspective on how the market might consolidate:
“Service mesh will become like electricity, just something you expect. The vast majority of people will go with what’s in their preferred cloud platform.”
Key Questions Around HashiCorp Consul Service on Azure
Petrocelli identified two open questions that would determine HCS’s long-term impact on Azure:
1. Azure Service Fabric Integration
At launch, HCS did not interoperate with Azure Service Fabric, Microsoft’s original hosted service mesh and orchestration platform. For HCS to achieve broad adoption among Azure-native developers — not just HashiCorp customers already using Consul — integration with Service Fabric would be an important milestone.
“I’m not really going to get excited about something in Azure that doesn’t take advantage of Azure’s own fabric.” — Tom Petrocelli, Amalgam Insights
2. Microsoft’s Positioning Strategy
Whether Microsoft positions HCS as its preferred service mesh for Azure or as one option among many hosted service mesh offerings will significantly affect uptake. If HCS is treated as the recommended default, it gains marketing momentum. If it sits alongside competing offerings with no differentiation, its appeal narrows to existing HashiCorp shops.
“If [HCS] is one of many [service mesh offerings on Azure], it’s nice if you happen to be a HashiCorp customer that also uses Azure.” — Tom Petrocelli, Amalgam Insights
What This Means for DevOps Engineers
For DevOps and platform engineering teams evaluating service mesh options on Azure, the key takeaways from these announcements are:
- If you already use HashiCorp tooling (Vault, Terraform, Nomad), HCS lowers the operational cost of adding Consul as a managed service without running your own control plane.
- If your infrastructure spans multiple Kubernetes clusters or includes VMs and bare metal, Consul Connect’s inter-cluster gateway capabilities are worth evaluating against Istio Multicluster and Linkerd’s equivalents.
- If you’re building platform tooling or policies that need to survive mesh vendor changes, track the SMI specification and prefer mesh implementations that conform to it.
- If you’re Azure-native and use Service Fabric, verify current HCS integration status before committing, as this was an open gap at launch.
The broader industry direction — toward standardized interoperability between mesh control planes — benefits enterprises running heterogeneous infrastructure regardless of which mesh vendor they choose today.