The API Traffic Viewer for Kubernetes

A simple-yet-powerful API traffic viewer for Kubernetes enabling you to view all API communication between microservices to help your debug and troubleshoot regressions.

Think TCPDump and Chrome Dev Tools combined.

Features

• Simple and powerful CLI
• Real-time view of all HTTP requests, REST and gRPC API calls
• No installation or code instrumentation
• Works completely on premises

Requirements

A Kubernetes server version of 1.16.0 or higher is required.

Download

Download Mizu for your platform and operating system

Latest Stable Release

• for MacOS - Intel

curl -Lo mizu \
https://github.com/up9inc/mizu/releases/latest/download/mizu_darwin_amd64 \
&& chmod 755 mizu

• for Linux - Intel 64bit

curl -Lo mizu \
https://github.com/up9inc/mizu/releases/latest/download/mizu_linux_amd64 \
&& chmod 755 mizu

SHA256 checksums are available on the Releases page

Development (unstable) Build

Pick one from the Releases page

Kubeconfig & Permissions

While mizumost often works out of the box, you can influence its behavior:

1. [OPTIONAL] Set KUBECONFIG environment variable to your Kubernetes configuration. If this is not set, Mizu assumes that configuration is at ${HOME}/.kube/config
2. mizu assumes user running the command has permissions to create resources (such as pods, services, namespaces) on your Kubernetes cluster (no worries - mizu resources are cleaned up upon termination)

For detailed list of k8s permissions see PERMISSIONS document

How to Run

1. Find pods you'd like to tap to in your Kubernetes cluster
2. Run mizu tap or mizu tap PODNAME
3. Open browser on http://localhost:8899/mizu or as instructed in the CLI
4. Watch the API traffic flowing
5. Type ^C to stop

Examples

Run mizu help for usage options

To tap all pods in current namespace -

 $ kubectl get pods 
 NAME                            READY   STATUS    RESTARTS   AGE
 carts-66c77f5fbb-fq65r          2/2     Running   0          20m
 catalogue-5f4cb7cf5-7zrmn       2/2     Running   0          20m
 front-end-649fc5fd6-kqbtn       2/2     Running   0          20m
 ..

 $ mizu tap
 +carts-66c77f5fbb-fq65r
 +catalogue-5f4cb7cf5-7zrmn
 +front-end-649fc5fd6-kqbtn
 Web interface is now available at http://localhost:8899
 ^C

To tap specific pod -

 $ kubectl get pods 
 NAME                            READY   STATUS    RESTARTS   AGE
 front-end-649fc5fd6-kqbtn       2/2     Running   0          7m
 ..

 $ mizu tap front-end-649fc5fd6-kqbtn
 +front-end-649fc5fd6-kqbtn
 Web interface is now available at http://localhost:8899
 ^C

To tap multiple pods using regex -

 $ kubectl get pods 
 NAME                            READY   STATUS    RESTARTS   AGE
 carts-66c77f5fbb-fq65r          2/2     Running   0          20m
 catalogue-5f4cb7cf5-7zrmn       2/2     Running   0          20m
 front-end-649fc5fd6-kqbtn       2/2     Running   0          20m
 ..

 $ mizu tap "^ca.*"
 +carts-66c77f5fbb-fq65r
 +catalogue-5f4cb7cf5-7zrmn
 Web interface is now available at http://localhost:8899
 ^C

Configuration

Mizu can work with config file which should be stored in ${HOME}/.mizu/config.yaml (macOS: ~/.mizu/config.yaml)
In case no config file found, defaults will be used
In case of partial configuration defined, all other fields will be used with defaults
You can always override the defaults or config file with CLI flags

To get the default config params run mizu config
To generate a new config file with default values use mizu config -r

Telemetry

By default, mizu reports usage telemetry. It can be disabled by adding a line of telemetry: false in the ${HOME}/.mizu/config.yaml file

Advanced Usage

Namespace-Restricted Mode

Some users have permission to only manage resources in one particular namespace assigned to them By default mizu tap creates a new namespace mizu for all of its Kubernetes resources. In order to instead install Mizu in an existing namespace, set the mizu-resources-namespace config option

If mizu-resources-namespace is set to a value other than the default mizu, Mizu will operate in a Namespace-Restricted mode. It will only tap pods in mizu-resources-namespace. This way Mizu only requires permissions to the namespace set by mizu-resources-namespace. The user must set the tapped namespace to the same namespace by using the --namespace flag or by setting tap.namespaces in the config file

Setting mizu-resources-namespace=mizu resets Mizu to its default behavior

User agent filtering

User-agent filtering (like health checks) - can be configured using command-line options:

$ mizu tap "^ca.*" --set tap.ignored-user-agents=kube-probe --set tap.ignored-user-agents=prometheus
+carts-66c77f5fbb-fq65r
+catalogue-5f4cb7cf5-7zrmn
Web interface is now available at http://localhost:8899
^C

Any request that contains User-Agent header with one of the specified values (kube-probe or prometheus) will not be captured

Traffic validation rules

This feature allows you to define set of simple rules, and test the traffic against them. Such validation may test response for specific JSON fields, headers, etc.

Please see TRAFFIC RULES page for more details and syntax.

OpenAPI Specification (OAS) Contract Monitoring

An OAS/Swagger file can contain schemas under parameters and responses fields. With --contract catalogue.yaml CLI option, you can pass your API description to Mizu and the traffic will automatically be validated against the contracts.

Please see CONTRACT MONITORING page for more details and syntax.

How to Run local UI

• run from mizu/agent go run main.go --hars-read --hars-dir <folder>

• copy Har files into the folder from last command

• change MizuWebsocketURL and apiURL in api.js file

• run from mizu/ui - npm run start

• open browser on localhost:3000