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https://github.com/telepresenceio/telepresence

Local development against a remote Kubernetes or OpenShift cluster
https://github.com/telepresenceio/telepresence

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Local development against a remote Kubernetes or OpenShift cluster

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README 

        
# Telepresence: fast, efficient local development for Kubernetes microservices



[](https://cncf-branding.netlify.app/img/projects/telepresence/horizontal/color/telepresence-horizontal-color.png)



Telepresence gives developers infinite scale development environments for Kubernetes.



Docs:

    OSS: [https://www.getambassador.io/docs/telepresence-oss/](https://www.getambassador.io/docs/telepresence-oss)

    Licensed: [https://www.getambassador.io/docs/telepresence ](https://www.getambassador.io/docs/telepresence )

Slack:

    Discuss in the [OSS CNCF Slack](https://communityinviter.com/apps/cloud-native/cncf) in the [#telepresence-oss](https://cloud-native.slack.com/archives/C06B36KJ85P) channel

    Licensed: [a8r.io/slack](https://a8r.io/slack)



**With Telepresence:**



* You run one service locally, using your favorite IDE and other tools

* You run the rest of your application in the [cloud](https://www.getambassador.io/products/ambassador-cloud/), where there is unlimited memory and compute



**This gives developers:**



* A fast local dev loop, with no waiting for a container build / push / deploy

* Ability to use their favorite local tools (IDE, debugger, etc.)

* Ability to run large-scale applications that can't run locally



## Quick Start



A few quick ways to start using Telepresence



* **Telepresence Quick Start:** [Quick Start](https://www.getambassador.io/docs/telepresence/latest/quick-start/)

* **Install Telepresence:** [Install](https://www.getambassador.io/docs/telepresence/latest/install/)

* **Contributor's Guide:** [Guide](https://github.com/telepresenceio/telepresence/blob/release/v2/DEVELOPING.md)

* **Meetings:** Check out our community [meeting schedule](https://github.com/telepresenceio/telepresence/blob/release/v2/MEETING_SCHEDULE.md) for opportunities to interact with Telepresence developers



## Walkthrough



### Install an interceptable service:

Start with an empty cluster:



```console

$ kubectl create deploy hello --image=registry.k8s.io/echoserver:1.4

deployment.apps/hello created

$ kubectl expose deploy hello --port 80 --target-port 8080

service/hello exposed

$ kubectl get ns,svc,deploy,po

NAME                        STATUS   AGE

namespace/kube-system       Active   53m

namespace/default           Active   53m

namespace/kube-public       Active   53m

namespace/kube-node-lease   Active   53m



NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE

service/kubernetes   ClusterIP   10.43.0.1              443/TCP   53m

service/hello        ClusterIP   10.43.73.112           80/TCP    2m



NAME                    READY   UP-TO-DATE   AVAILABLE   AGE

deployment.apps/hello   1/1     1            1           2m



NAME                        READY   STATUS    RESTARTS   AGE

pod/hello-9954f98bf-6p2k9   1/1     Running   0          2m15s

```



Check telepresence version

```console

$ telepresence version

OSS Client : v2.17.0

Root Daemon: not running

User Daemon: not running

```



### Setup Traffic Manager in the cluster



Install Traffic Manager in your cluster. By default, it will reside in the `ambassador` namespace:

```console

$ telepresence helm install



Traffic Manager installed successfully

```



### Establish a connection to  the cluster (outbound traffic)



Let telepresence connect:

```console

$ telepresence connect

Launching Telepresence Root Daemon

Launching Telepresence User Daemon

Connected to context default, namespace default (https://35.232.104.64)

```



A session is now active and outbound connections will be routed to the cluster. I.e. your laptop is logically "inside"

a namespace in the cluster.



Since telepresence connected to the default namespace, all services in that namespace can now be reached directly

by their name. You can of course also use namespaced names, e.g. `curl hello.default`.



```console

$ curl hello

CLIENT VALUES:

client_address=10.244.0.87

command=GET

real path=/

query=nil

request_version=1.1

request_uri=http://hello:8080/



SERVER VALUES:

server_version=nginx: 1.10.0 - lua: 10001



HEADERS RECEIVED:

accept=*/*

host=hello

user-agent=curl/8.0.1

BODY:

-no body in request-

```



### Intercept the service. I.e. redirect traffic to it to our laptop (inbound traffic)



Add an intercept for the hello deployment on port 9000. Here, we also start a service listening on that port:



```console

$ telepresence intercept hello --port 9000 -- python3 -m http.server 9000

Using Deployment hello

intercepted

    Intercept name         : hello

    State                  : ACTIVE

    Workload kind          : Deployment

    Destination            : 127.0.0.1:9000

    Service Port Identifier: 80

    Volume Mount Point     : /tmp/telfs-524630891

    Intercepting           : all TCP connections

Serving HTTP on 0.0.0.0 port 9000 (http://0.0.0.0:9000/) ...

```



The `python -m httpserver` is now started on port 9000 and will run until terminated by `-C`. Access it from a browser using `http://hello/` or use curl from another terminal. With curl, it presents a html listing from the directory where the server was started. Something like:

```console

$ curl hello



Directory listing for /



Directory listing for /









```



Observe that the python service reports that it's being accessed:

```

127.0.0.1 - - [16/Jun/2022 11:39:20] "GET / HTTP/1.1" 200 -

```



### Clean-up and close daemon processes



End the service with `-C` and then try `curl hello` or `http://hello` again. The intercept is gone, and the echo service responds as normal.



Now end the session too. Your desktop no longer has access to the cluster internals.

```console

$ telepresence quit

Disconnected

$ curl hello

curl: (6) Could not resolve host: hello

```



The telepresence daemons are still running in the background, which is harmless. You'll need to stop them before you

upgrade telepresence. That's done by passing the option `-s` (stop all local telepresence daemons) to the

quit command.



```console

$ telepresence quit -s

Telepresence Daemons quitting...done

```



### What got installed in the cluster?



Telepresence installs the Traffic Manager in your cluster if it is not already present. This deployment remains unless you uninstall it.



Telepresence injects the Traffic Agent as an additional container into the pods of the workload you intercept, and  will optionally install

an init-container to route traffic through the agent (the init-container is only injected when the service is headless or uses a numerical

`targetPort`). The modifications persist unless you uninstall them.



At first glance, we can see that the deployment is installed ...

```console

$ kubectl get svc,deploy,pod

service/kubernetes   ClusterIP   10.43.0.1               443/TCP                      7d22h

service/hello        ClusterIP   10.43.145.57            80/TCP                       13m



NAME                    READY   UP-TO-DATE   AVAILABLE   AGE

deployment.apps/hello   1/1     1            1           13m



NAME                         READY   STATUS    RESTARTS        AGE

pod/hello-774455b6f5-6x6vs   2/2     Running   0               10m

```



... and that the traffic-manager is installed in the "ambassador" namespace.



```console

$ kubectl -n ambassador get svc,deploy,pod

NAME                      TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE

service/traffic-manager   ClusterIP   None                   8081/TCP   17m

service/agent-injector    ClusterIP   10.43.72.154           443/TCP    17m



NAME                              READY   UP-TO-DATE   AVAILABLE   AGE

deployment.apps/traffic-manager   1/1     1            1           17m



NAME                                  READY   STATUS    RESTARTS   AGE

pod/traffic-manager-dcd4cc64f-6v5bp   1/1     Running   0          17m

```



The traffic-agent is installed too, in the hello pod. Here together with an init-container, because the service is using a numerical

`targetPort`.



```console

$ kubectl describe pod hello-774455b6f5-6x6vs

Name:             hello-75b7c6d484-9r4xd

Namespace:        default

Priority:         0

Service Account:  default

Node:             kind-control-plane/192.168.96.2

Start Time:       Sun, 07 Jan 2024 01:01:33 +0100

Labels:           app=hello

                  pod-template-hash=75b7c6d484

                  telepresence.io/workloadEnabled=true

                  telepresence.io/workloadName=hello

Annotations:      telepresence.getambassador.io/inject-traffic-agent: enabled

                  telepresence.getambassador.io/restartedAt: 2024-01-07T00:01:33Z

Status:           Running

IP:               10.244.0.89

IPs:

  IP:           10.244.0.89

Controlled By:  ReplicaSet/hello-75b7c6d484

Init Containers:

  tel-agent-init:

    Container ID:  containerd://4acdf45992980e2796f0eb79fb41afb1a57808d108eb14a355cb390ccc764571

    Image:         docker.io/datawire/tel2:2.17.0

    Image ID:      docker.io/datawire/tel2@sha256:e18aed6e7bd3c15cb5a99161c164e0303d20156af68ef138faca98dc2c5754a7

    Port:          

    Host Port:     

    Args:

      agent-init

    State:          Terminated

      Reason:       Completed

      Exit Code:    0

      Started:      Sun, 07 Jan 2024 01:01:34 +0100

      Finished:     Sun, 07 Jan 2024 01:01:34 +0100

    Ready:          True

    Restart Count:  0

    Environment:    

    Mounts:

      /etc/traffic-agent from traffic-config (rw)

      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-svf4h (ro)

Containers:

  echoserver:

    Container ID:   containerd://577e140545f3106c90078e687e0db3661db815062084bb0c9f6b2d0b4f949308

    Image:          registry.k8s.io/echoserver:1.4

    Image ID:       sha256:523cad1a4df732d41406c9de49f932cd60d56ffd50619158a2977fd1066028f9

    Port:           

    Host Port:      

    State:          Running

      Started:      Sun, 07 Jan 2024 01:01:34 +0100

    Ready:          True

    Restart Count:  0

    Environment:    

    Mounts:

      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-svf4h (ro)

  traffic-agent:

    Container ID:  containerd://17558b4711903f4cb580c5afafa169d314a7deaf33faa749f59d3a2f8eed80a9

    Image:         docker.io/datawire/tel2:2.17.0

    Image ID:      docker.io/datawire/tel2@sha256:e18aed6e7bd3c15cb5a99161c164e0303d20156af68ef138faca98dc2c5754a7

    Port:          9900/TCP

    Host Port:     0/TCP

    Args:

      agent

    State:          Running

      Started:      Sun, 07 Jan 2024 01:01:34 +0100

    Ready:          True

    Restart Count:  0

    Readiness:      exec [/bin/stat /tmp/agent/ready] delay=0s timeout=1s period=10s #success=1 #failure=3

    Environment:

      _TEL_AGENT_POD_IP:       (v1:status.podIP)

      _TEL_AGENT_NAME:        hello-75b7c6d484-9r4xd (v1:metadata.name)

      A_TELEPRESENCE_MOUNTS:  /var/run/secrets/kubernetes.io/serviceaccount

    Mounts:

      /etc/traffic-agent from traffic-config (rw)

      /tel_app_exports from export-volume (rw)

      /tel_app_mounts/echoserver/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-svf4h (ro)

      /tel_pod_info from traffic-annotations (rw)

      /tmp from tel-agent-tmp (rw)

      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-svf4h (ro)

Conditions:

  Type              Status

  Initialized       True 

  Ready             True 

  ContainersReady   True 

  PodScheduled      True 

Volumes:

  kube-api-access-svf4h:

    Type:                    Projected (a volume that contains injected data from multiple sources)

    TokenExpirationSeconds:  3607

    ConfigMapName:           kube-root-ca.crt

    ConfigMapOptional:       

    DownwardAPI:             true

  traffic-annotations:

    Type:  DownwardAPI (a volume populated by information about the pod)

    Items:

      metadata.annotations -> annotations

  traffic-config:

    Type:      ConfigMap (a volume populated by a ConfigMap)

    Name:      telepresence-agents

    Optional:  false

  export-volume:

    Type:       EmptyDir (a temporary directory that shares a pod's lifetime)

    Medium:     

    SizeLimit:  

  tel-agent-tmp:

    Type:        EmptyDir (a temporary directory that shares a pod's lifetime)

    Medium:      

    SizeLimit:   

QoS Class:       BestEffort

Node-Selectors:  

Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s

                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s

Events:

  Type    Reason     Age    From               Message

  ----    ------     ----   ----               -------

  Normal  Scheduled  7m40s  default-scheduler  Successfully assigned default/hello-75b7c6d484-9r4xd to kind-control-plane

  Normal  Pulled     7m40s  kubelet            Container image "docker.io/datawire/tel2:2.17.0" already present on machine

  Normal  Created    7m40s  kubelet            Created container tel-agent-init

  Normal  Started    7m39s  kubelet            Started container tel-agent-init

  Normal  Pulled     7m39s  kubelet            Container image "registry.k8s.io/echoserver:1.4" already present on machine

  Normal  Created    7m39s  kubelet            Created container echoserver

  Normal  Started    7m39s  kubelet            Started container echoserver

  Normal  Pulled     7m39s  kubelet            Container image "docker.io/datawire/tel2:2.17.0" already present on machine

  Normal  Created    7m39s  kubelet            Created container traffic-agent

  Normal  Started    7m39s  kubelet            Started container traffic-agent

```



Telepresence keeps track of all possible intercepts for containers that have an agent installed in the configmap `telepresence-agents`.  



```console

$ kubectl describe configmap telepresence-agents 

Name:         telepresence-agents

Namespace:    default

Labels:       app.kubernetes.io/created-by=traffic-manager

              app.kubernetes.io/name=telepresence-agents

              app.kubernetes.io/version=2.17.0

Annotations:  



Data

====

hello:

----

agentImage: localhost:5000/tel2:2.17.0

agentName: hello

containers:

- Mounts: null

  envPrefix: A_

  intercepts:

  - agentPort: 9900

    containerPort: 8080

    protocol: TCP

    serviceName: hello

    servicePort: 80

    serviceUID: 68a4ecd7-0a12-44e2-9293-dc16fb205621

    targetPortNumeric: true

  mountPoint: /tel_app_mounts/echoserver

  name: echoserver

logLevel: debug

managerHost: traffic-manager.ambassador

managerPort: 8081

namespace: default

pullPolicy: IfNotPresent

tracingPort: 15766

workloadKind: Deployment

workloadName: hello



BinaryData

====



Events:  

```



### Uninstalling



You can uninstall the traffic-agent from specific deployments or from all deployments. Or you can choose to uninstall everything in which

case the traffic-manager and all traffic-agents will be uninstalled.



```console

$ telepresence helm uninstall

```

will remove everything that was automatically installed by telepresence from the cluster.



```console

$ telepresence uninstall --agent hello

```

will remove the traffic-agent and the configmap entry.



### Troubleshooting



The telepresence background processes `daemon` and `connector` both produces log files that can be very helpful when problems are

encountered. The files are named `daemon.log` and `connector.log`. The location of the logs differ depending on what platform that is used:



- macOS `~/Library/Logs/telepresence`

- Linux `~/.cache/telepresence/logs`

- Windows `"%USERPROFILE%\AppData\Local\logs"`



Visit the troubleshooting section in the Telepresence documentation for more advice:

[Troubleshooting](https://www.getambassador.io/docs/telepresence/latest/troubleshooting/)