GitHub - floci-io/floci-oci: Light, fluffy, and always free - Local Oracle Cloud Emulator

Light, fluffy, and always free — now for Oracle Cloud
No account. No API key ceremony. No feature gates. Just docker compose up.

Quick Start · Features · Services · SDKs · Terraform · Docs

What is floci-oci?

floci-oci is a free, open-source local Oracle Cloud Infrastructure (OCI) emulator for development, testing, and CI.

It gives you OCI-shaped services on your machine without an Oracle Cloud account, uploaded API keys, or paid feature gates. Point the OCI SDKs, the OCI CLI, Terraform, or OpenTofu at http://localhost:4599 and keep your existing workflows.

floci-oci is the OCI member of the Floci emulator family — named after floccus, the cloud formation that looks like popcorn.

Emulator	Cloud	Port
floci	AWS	4566
floci-az	Azure	4577
floci-gcp	GCP	4588
floci-oci	OCI	4599

Quick Start

Create a compose.yaml file:

services:
  floci-oci:
    image: floci/floci-oci:latest
    ports:
      - "4599:4599"

Start floci-oci:

docker compose up

Use your existing OCI tools normally:

oci os ns get --endpoint http://localhost:4599

oci os bucket create --endpoint http://localhost:4599 \
  --compartment-id ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000 \
  --namespace floci-local --name my-bucket

oci iam compartment list --endpoint http://localhost:4599 \
  --compartment-id ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000

Any locally generated API key works — floci-oci parses the request signature for tenancy and user context but never verifies it. See OCI CLI & SDK Setup for a one-time throwaway config.

Prefer building from source?

Requirements: JDK 25.

./mvnw quarkus:dev          # dev mode on port 4599
# or
./mvnw clean package -DskipTests
java -jar target/quarkus-app/quarkus-run.jar

Verify it is up:

curl http://localhost:4599/_floci-oci/health

Bundled CLI wrapper

bin/ocilocal injects the emulator endpoint into every OCI CLI call:

bin/ocilocal os ns get
bin/ocilocal iam region list

Features

Local OCI without the cloud account

Run OCI-compatible services locally without an Oracle Cloud account, uploaded API keys, or paid feature gates.

Real OCI wire protocols

Real request and response shapes: opc-request-id on every response, opc-next-page pagination headers, etag / if-match conditional requests, OCIDs, work requests for async operations, and OCI's exact error bodies (NotAuthorizedOrNotFound, BucketNotFound, …).

Drop-in SDK, CLI, and IaC compatibility

The official oci-java-sdk, Python SDK, OCI CLI, and the oracle/oci Terraform provider work unchanged — validated continuously by the compatibility suite.

Fast enough for CI

Built on Quarkus with GraalVM native-image support, so it starts fast and stays light in test pipelines.

Configurable persistence

Choose from in-memory, persistent, hybrid, and write-ahead log storage depending on the durability profile you need.

Why floci-oci?

Oracle Cloud has no official local emulator — no LocalStack equivalent, no all-in-one dev container. Testing OCI integrations means a real tenancy, real credentials, and real network round-trips, even in CI.

floci-oci fills that gap the same way its siblings do for AWS, Azure, and GCP: one container, one port, real wire protocols, MIT licensed, free forever.

Architecture Overview

flowchart LR
    Client["OCI SDK / CLI / Terraform"]

    subgraph FlociOci ["floci-oci, port 4599"]
        Router["HTTP Router\nJAX-RS"]

        subgraph Services ["Services"]
            A["Identity /20160918\nObject Storage /n/…\nQueue /20210201\nStreaming /20180418"]
            B["Vault · KMS · Secrets\n/20180608 · /20190301\nreal AES/RSA/ECDSA"]
            C["Functions /20181201"]
        end

        WR["Work Requests\nasync-operation plane"]
        Auth["Signature parsing\ntenancy context"]

        Router --> Auth --> Services
        Services --> WR
        Services --> Store[("StorageBackend\nmemory · hybrid · persistent · wal\ntenancy-isolated")]
    end

    Docker["Docker Engine"]
    Client -->|"HTTP :4599\nOCI wire protocol"| Router
    C -->|"invoke"| Fn["fnproject/fnserver\nsidecar"]
    Fn -->|"runs your image"| Docker

Supported Services

Category	Services
Identity	Compartments, users, groups, user-group memberships, policies, availability domains, regions, region subscriptions, tenancies
Storage	Object Storage: namespaces, buckets, objects, listing, rename, copy, multipart uploads, pre-authenticated requests
Messaging	Queue (visibility timeouts, dead-letter queues, channels), Streaming (partitioned log, cursors, consumer groups)
Security	Vault + KMS (vaults, keys, key versions, real AES-GCM / RSA / ECDSA crypto), Secrets and secret bundles
Serverless	Functions (applications, functions, real invocation through an Fn Project sidecar)
Async operations	Work requests, partitioned per service (Identity/Queue/Streaming use `SUCCEEDED`, Object Storage uses `COMPLETED`)

For operation-level compatibility, see the Services Overview.

Detailed service notes

Service	How it works	Notable features
Identity (IAM)	In-process	Compartment CRUD incl. `compartmentIdInSubtree` listing and async delete via work request; users, groups, memberships; policies (statements stored verbatim); reference data (3 ADs, regions, tenancy); etag concurrency on every mutation
Object Storage	In-process	Bucket CRUD (delete requires empty); objects with `Content-MD5` verification, `opc-meta-*` metadata, Range/206 reads, conditional headers; ListObjects with `prefix`/`start`/`end`/`delimiter`/`fields` and `nextStartWith` truncation; rename; async copy via work request; multipart uploads (per-part `etag` + `opc-content-md5`); pre-authenticated requests with anonymous `/p/{token}/…` data path
Queue	In-process	Work-request-driven control plane (mutations return no body); data plane with visibility timeouts, `0`-visibility peeks, long polling, dead-letter queues, per-channel filtering, stats; wrapped `{"items":[…]}` list shape
Streaming	In-process	Partitioned append-only log with key-hash placement; opaque cursors (`TRIM_HORIZON`/`LATEST`/`AT_OFFSET`/`AFTER_OFFSET`/`AT_TIME`), group cursors with commit + resume, `opc-next-cursor` paging; CreateStream returns body and work request
Vault + KMS	In-process, real crypto	Vaults and keys with schedule/cancel deletion (no DELETE verb), key rotation; AES-GCM encrypt/decrypt whose envelope survives rotation, RSA/ECDSA sign/verify via JCA, CRC32 `plaintextChecksum`
Secrets	In-process	Secret versions with CURRENT/PREVIOUS/LATEST stages; the `Secret` shape never echoes content — retrieval is through `/20190301/secretbundles`, including the bodyless POST `getByName`
Functions	Real Docker (Fn Project)	Applications and functions with deterministic image digests; invocation proxied to a shared `fnproject/fnserver` sidecar that runs your real FDK image. `mock: true` disables Docker entirely
Work Requests	In-process	`202` + `opc-work-request-id` responses, pollable per service (`/20160918`, `/20210201`, `/20180418` and unversioned `/workRequests`) with errors/logs endpoints

Not implemented yet: identity domains, API keys/auth tokens, dynamic groups, tag namespaces, object versioning, retention rules (stubbed empty for Terraform compatibility), lifecycle policies, replication, the Amazon S3 Compatibility API, queue consumer groups, stream pools' Kafka settings and connect harnesses, KMS import/backup/replication, secret rotation, and pre-built functions (PBF).

Real Docker Integration

floci-oci runs a real container where in-process emulation would not be faithful.

Service	Default image	What is real
Functions	`fnproject/fnserver:latest`	The open-source engine OCI Functions is built on. Your function image runs for real — fnserver spawns it as a sibling container and speaks the FDK http-stream contract

Docker-backed services need the Docker socket:

docker run -d --name floci-oci \
  -p 4599:4599 \
  -v /var/run/docker.sock:/var/run/docker.sock \
  floci/floci-oci:latest

Set FLOCI_OCI_SERVICES_FUNCTIONS_MOCK=true to skip Docker entirely — the management plane stays fully usable and invocations return a synthetic body. That is the default in the test suite, so ./mvnw test never needs a Docker daemon.

services/functions/ is also the reference implementation for contributing a sidecar-backed service; see the "Services with Container Sidecars" section of AGENTS.md.

Persistence and Storage Modes

floci-oci can trade speed for durability depending on the workflow. Configure the default mode with FLOCI_OCI_STORAGE_MODE, or override storage per service.

Mode	Behavior	Best for	Durability
`memory`	Entirely in RAM. Data is lost when the container stops.	CI and ephemeral tests	None
`persistent`	Loaded at startup and flushed to disk immediately on every write operation.	Simple local state preservation with immediate persistence	Medium
`hybrid`	In-memory performance with periodic async flushing every 5 seconds.	Local development	Good
`wal`	Write-ahead log. Every mutation is logged before responding.	Maximum durability	Highest

Per-service overrides use the map form: FLOCI_OCI_STORAGE_SERVICES_OBJECTSTORAGE_MODE=wal.

For more detail, see the Storage Configuration documentation.

Multi-Tenancy Isolation

floci-oci supports per-tenancy resource isolation with no extra setup. The tenancy OCID in your signing key's keyId is the storage partition — requests signed with different tenancy OCIDs see fully isolated resources.

# Two profiles with different tenancy OCIDs see independent worlds
oci --profile TENANCY_A iam user list --endpoint http://localhost:4599
oci --profile TENANCY_B iam user list --endpoint http://localhost:4599

Unsigned requests fall back to FLOCI_OCI_DEFAULT_TENANCY_ID. Compartments are a field on each resource (filtered via compartmentId), exactly as on real OCI — tenancy is the isolation boundary, compartments are the organizational one.

SDK Integration

Point your existing OCI SDK at http://localhost:4599. Any locally generated RSA key works — the signature is parsed for tenancy/user context, never verified.

Java, oci-java-sdk

KeyPair pair = KeyPairGenerator.getInstance("RSA").generateKeyPair();
var auth = SimpleAuthenticationDetailsProvider.builder()
        .tenantId("ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000")
        .userId("ocid1.user.oc1..anyuser")
        .fingerprint("aa:bb:cc:dd:ee:ff:00:11:22:33:44:55:66:77:88:99")
        .privateKeySupplier(() -> new ByteArrayInputStream(pemOf(pair)))
        .region(Region.US_ASHBURN_1)
        .build();

ObjectStorageClient client = ObjectStorageClient.builder().build(auth);
client.setEndpoint("http://localhost:4599");

String namespace = client.getNamespace(GetNamespaceRequest.builder().build()).getValue();
client.createBucket(CreateBucketRequest.builder()
        .namespaceName(namespace)
        .createBucketDetails(CreateBucketDetails.builder()
                .name("my-bucket")
                .compartmentId(auth.getTenantId())
                .build())
        .build());

Python, oci

import oci

config = {
    "user": "ocid1.user.oc1..anyuser",
    "fingerprint": "aa:bb:cc:dd:ee:ff:00:11:22:33:44:55:66:77:88:99",
    "tenancy": "ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000",
    "region": "us-ashburn-1",
    "key_file": "~/.oci/floci_key.pem",   # any locally generated key
}

client = oci.object_storage.ObjectStorageClient(
    config, service_endpoint="http://localhost:4599")

namespace = client.get_namespace().data
client.put_object(namespace, "my-bucket", "hello.txt", b"hello from floci-oci")
print(client.get_object(namespace, "my-bucket", "hello.txt").data.content)

Bash, OCI CLI

# One-time throwaway profile
mkdir -p ~/.oci && openssl genrsa -out ~/.oci/floci_key.pem 2048
cat >> ~/.oci/config <<'EOF'
[FLOCI]
user=ocid1.user.oc1..flocilocaluser0000000000000000000000000000000000000000000000
fingerprint=aa:bb:cc:dd:ee:ff:00:11:22:33:44:55:66:77:88:99
tenancy=ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000
region=us-ashburn-1
key_file=~/.oci/floci_key.pem
EOF

oci --profile FLOCI os ns get --endpoint http://localhost:4599

Terraform and OpenTofu

The official oracle/oci provider works against floci-oci through its per-client host overrides — no provider fork, no wrapper:

export TF_VAR_CLIENT_HOST_OVERRIDES="oci_identity.IdentityClient=http://localhost:4599;oci_object_storage.ObjectStorageClient=http://localhost:4599"

provider "oci" {
  tenancy_ocid     = "ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000"
  user_ocid        = "ocid1.user.oc1..anyuser"
  fingerprint      = "aa:bb:cc:dd:ee:ff:00:11:22:33:44:55:66:77:88:99"
  private_key_path = "./any_local_key.pem"
  region           = "us-ashburn-1"
}

resource "oci_objectstorage_bucket" "demo" {
  compartment_id = "ocid1.tenancy.oc1..flocilocaltenancy0000000000000000000000000000000000000000"
  namespace      = "floci-local"
  name           = "demo-bucket"
}

The full apply → plan (zero drift) → destroy cycle is validated in CI for both Terraform and OpenTofu. See compatibility-tests/compat-terraform for a working example.

Compatibility Testing

The compatibility-tests directory validates floci-oci with real SDKs and IaC tooling — not just theoretical protocol adherence.

Module	Language / Tool	SDK / Client	Tests
`sdk-test-java`	Java	oci-java-sdk	18
`sdk-test-python`	Python 3	oci (incl. `UploadManager` streaming)	20
`compat-terraform`	Terraform	oracle/oci provider (11 resources, zero-drift plan)	6
`compat-opentofu`	OpenTofu	oracle/oci provider (11 resources, zero-drift plan)	6

Run everything in Docker against a compose-built emulator:

make compat-docker

Or a single suite against a locally running emulator: make test-java-compat, make test-python-compat, make test-terraform-compat, make test-opentofu-compat.

Image Tags

Every tag combines a variant and a channel.

Channel	Standard	Compat with OCI CLI and Python SDK
Release, floating	`latest`	`latest-compat`
Release, pinned	`x.y.z`	`x.y.z-compat`
Nightly, floating	`nightly`	`nightly-compat`
Nightly, dated	`nightly-mmddyyyy`	`nightly-mmddyyyy-compat`

Use latest for stable releases, a pinned version for reproducible builds, and nightly to track main.

# Recommended
image: floci/floci-oci:latest

# Includes the OCI CLI and the oci Python SDK
image: floci/floci-oci:latest-compat

# Pinned release
image: floci/floci-oci:0.1.0

# Track main
image: floci/floci-oci:nightly

The compat image ships a throwaway API key and config, so the CLI works with no setup:

docker run -d --name floci-oci -p 4599:4599 floci/floci-oci:latest-compat
docker exec floci-oci ocilocal os ns get

ocilocal is a thin wrapper that points oci at the emulator. The bundled key exists only because the OCI CLI refuses to run without one — floci-oci parses request signatures but never verifies them, so the key is public by design. Never point that config at real OCI.

Configuration

All settings are overridable through environment variables with the FLOCI_OCI_ prefix.

Variable	Default	Description
`FLOCI_OCI_PORT`	`4599`	Port exposed by the floci-oci API
`FLOCI_OCI_DEFAULT_REGION`	`us-ashburn-1`	Region used in OCIDs and reference data
`FLOCI_OCI_DEFAULT_REALM`	`oc1`	Realm key used when minting OCIDs
`FLOCI_OCI_DEFAULT_TENANCY_ID`	`ocid1.tenancy.oc1..flocilocal…`	Tenancy used for unsigned requests
`FLOCI_OCI_DEFAULT_NAMESPACE`	`floci-local`	Object Storage namespace
`FLOCI_OCI_BASE_URL`	`http://localhost:4599`	Base URL used when floci-oci returns service URLs
`FLOCI_OCI_HOSTNAME`	Unset	Hostname used in returned URLs when floci-oci runs inside Docker Compose
`FLOCI_OCI_STORAGE_MODE`	`memory`	Storage mode: `memory`, `persistent`, `hybrid`, or `wal`
`FLOCI_OCI_STORAGE_PERSISTENT_PATH`	`./data`	Directory used for persisted state
`FLOCI_OCI_AUTH_REQUIRE_SIGNATURE`	`false`	Reject unsigned requests with 401 `NotAuthenticated`
`FLOCI_OCI_TLS_ENABLED`	`false`	Serve HTTPS + HTTP on the same port

Full reference: configuration docs

Multi-container Docker Compose

When your application runs in a different container, set FLOCI_OCI_HOSTNAME to the floci-oci service name so returned URLs resolve correctly.

services:
  floci-oci:
    image: floci/floci-oci:latest
    ports:
      - "4599:4599"
    environment:
      - FLOCI_OCI_HOSTNAME=floci-oci

  my-app:
    environment:
      - OCI_ENDPOINT=http://floci-oci:4599
    depends_on:
      - floci-oci

Community

Join the Floci community on Slack or GitHub Discussions. Feature ideas, compatibility questions, design tradeoffs, and rough proposals are welcome.

Star History

Contributors

License

MIT. Use it however you want.

Name		Name	Last commit message	Last commit date
Latest commit History 67 Commits
.github		.github
.mvn/wrapper		.mvn/wrapper
bin		bin
compatibility-tests		compatibility-tests
docker		docker
docs		docs
overrides		overrides
src		src
.dockerignore		.dockerignore
.gitattributes		.gitattributes
.gitignore		.gitignore
.releaserc.json		.releaserc.json
AGENTS.md		AGENTS.md
CHANGELOG.md		CHANGELOG.md
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
SECURITY.md		SECURITY.md
docker-compose.yml		docker-compose.yml
mkdocs.yml		mkdocs.yml
mvnw		mvnw
mvnw.cmd		mvnw.cmd
pom.xml		pom.xml

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Quick Start

Features

Why floci-oci?

Architecture Overview

Supported Services

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Persistence and Storage Modes

Multi-Tenancy Isolation

SDK Integration

Terraform and OpenTofu

Compatibility Testing

Image Tags

Configuration

Multi-container Docker Compose

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