220 lines
6.5 KiB
Markdown
220 lines
6.5 KiB
Markdown
# Smoke Test
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In this lab you will complete a series of tasks to ensure your Kubernetes cluster is functioning correctly.
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## Data Encryption
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In this section you will verify the ability to [encrypt secret data at rest](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/#verifying-that-data-is-encrypted).
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Create a generic secret:
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```
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kubectl create secret generic kubernetes-the-hard-way \
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--from-literal="mykey=mydata"
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```
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Print a hexdump of the `kubernetes-the-hard-way` secret stored in etcd:
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```
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gcloud compute ssh controller-0 \
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--command "sudo ETCDCTL_API=3 etcdctl get \
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--endpoints=https://127.0.0.1:2379 \
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--cacert=/etc/etcd/ca.pem \
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--cert=/etc/etcd/kubernetes.pem \
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--key=/etc/etcd/kubernetes-key.pem\
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/registry/secrets/default/kubernetes-the-hard-way | hexdump -C"
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```
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> output
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```
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00000000 2f 72 65 67 69 73 74 72 79 2f 73 65 63 72 65 74 |/registry/secret|
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00000010 73 2f 64 65 66 61 75 6c 74 2f 6b 75 62 65 72 6e |s/default/kubern|
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00000020 65 74 65 73 2d 74 68 65 2d 68 61 72 64 2d 77 61 |etes-the-hard-wa|
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00000030 79 0a 6b 38 73 3a 65 6e 63 3a 61 65 73 63 62 63 |y.k8s:enc:aescbc|
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00000040 3a 76 31 3a 6b 65 79 31 3a 8c 7b 16 f3 26 59 d5 |:v1:key1:.{..&Y.|
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00000050 c9 65 1c f0 3a 04 e7 66 2a f6 50 93 4e d4 d7 8c |.e..:..f*.P.N...|
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00000060 ca 24 ab 68 54 5f 31 f6 5c e5 5c c6 29 1d cc da |.$.hT_1.\.\.)...|
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00000070 22 fc c9 be 23 8a 26 b4 9b 38 1d 57 65 87 2a ac |"...#.&..8.We.*.|
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00000080 70 11 ea 06 93 b7 de ba 12 83 42 94 9d 27 8f ee |p.........B..'..|
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00000090 95 05 b0 77 31 ab 66 3d d9 e2 38 85 f9 a5 59 3a |...w1.f=..8...Y:|
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000000a0 90 c1 46 ae b4 9d 13 05 82 58 71 4e 5b cb ac e2 |..F......XqN[...|
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000000b0 3b 6e d7 10 ab 7c fc fe dd f0 e6 0a 7b 24 2e 68 |;n...|......{$.h|
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000000c0 5e 78 98 5f 33 40 f8 d2 10 30 1f de 17 3f 06 a1 |^x._3@...0...?..|
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000000d0 81 bd 1f 2e be e9 35 26 2c be 39 16 cf ac c2 6d |......5&,.9....m|
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000000e0 32 56 05 7d 80 39 5d c0 a4 43 46 75 96 0c 87 49 |2V.}.9]..CFu...I|
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000000f0 3c 17 1a 1c 8e 52 b1 e8 42 6b a5 e8 b2 b3 27 bc |<....R..Bk....'.|
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00000100 80 a6 53 2a 9f 57 d2 de a3 f8 7f 84 2c 01 c9 d9 |..S*.W......,...|
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00000110 4f e0 3f e7 a7 1e 46 b7 47 dc f0 53 d2 d2 e1 99 |O.?...F.G..S....|
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00000120 0b b7 b3 49 d0 3c a5 e8 26 ce 2c 51 42 2c 0f 48 |...I.<..&.,QB,.H|
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00000130 b1 9a 1a dd 24 d1 06 d8 34 bf 09 2e 20 cc 3d 3d |....$...4... .==|
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00000140 e2 5a e5 e4 44 b7 ae 57 49 0a |.Z..D..WI.|
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0000014a
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```
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The etcd key should be prefixed with `k8s:enc:aescbc:v1:key1`, which indicates the `aescbc` provider was used to encrypt the data with the `key1` encryption key.
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## Deployments
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In this section you will verify the ability to create and manage [Deployments](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/).
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Create a deployment for the [nginx](https://nginx.org/en/) web server:
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```
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kubectl create deployment nginx --image=nginx
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```
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List the pod created by the `nginx` deployment:
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```
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kubectl get pods -l app=nginx
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```
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> output
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```
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NAME READY STATUS RESTARTS AGE
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nginx-f89759699-kpn5m 1/1 Running 0 10s
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```
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### Port Forwarding
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In this section you will verify the ability to access applications remotely using [port forwarding](https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/).
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Retrieve the full name of the `nginx` pod:
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```
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POD_NAME=$(kubectl get pods -l app=nginx -o jsonpath="{.items[0].metadata.name}")
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```
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Forward port `8080` on your local machine to port `80` of the `nginx` pod:
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```
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kubectl port-forward $POD_NAME 8080:80
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```
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> output
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```
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Forwarding from 127.0.0.1:8080 -> 80
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Forwarding from [::1]:8080 -> 80
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```
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In a new terminal make an HTTP request using the forwarding address:
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```
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curl --head http://127.0.0.1:8080
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```
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> output
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```
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HTTP/1.1 200 OK
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Server: nginx/1.19.1
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Date: Sat, 18 Jul 2020 07:14:00 GMT
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Content-Type: text/html
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Content-Length: 612
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Last-Modified: Tue, 07 Jul 2020 15:52:25 GMT
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Connection: keep-alive
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ETag: "5f049a39-264"
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Accept-Ranges: bytes
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```
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Switch back to the previous terminal and stop the port forwarding to the `nginx` pod:
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```
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Forwarding from 127.0.0.1:8080 -> 80
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Forwarding from [::1]:8080 -> 80
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Handling connection for 8080
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^C
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```
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### Logs
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In this section you will verify the ability to [retrieve container logs](https://kubernetes.io/docs/concepts/cluster-administration/logging/).
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Print the `nginx` pod logs:
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```
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kubectl logs $POD_NAME
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```
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> output
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```
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...
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127.0.0.1 - - [18/Jul/2020:07:14:00 +0000] "HEAD / HTTP/1.1" 200 0 "-" "curl/7.64.0" "-"
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```
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### Exec
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In this section you will verify the ability to [execute commands in a container](https://kubernetes.io/docs/tasks/debug-application-cluster/get-shell-running-container/#running-individual-commands-in-a-container).
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Print the nginx version by executing the `nginx -v` command in the `nginx` container:
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```
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kubectl exec -ti $POD_NAME -- nginx -v
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```
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> output
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```
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nginx version: nginx/1.19.1
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```
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## Services
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In this section you will verify the ability to expose applications using a [Service](https://kubernetes.io/docs/concepts/services-networking/service/).
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Expose the `nginx` deployment using a [NodePort](https://kubernetes.io/docs/concepts/services-networking/service/#nodeport) service:
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```
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kubectl expose deployment nginx --port 80 --type NodePort
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```
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> The LoadBalancer service type can not be used because your cluster is not configured with [cloud provider integration](https://kubernetes.io/docs/getting-started-guides/scratch/#cloud-provider). Setting up cloud provider integration is out of scope for this tutorial.
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Retrieve the node port assigned to the `nginx` service:
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```
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NODE_PORT=$(kubectl get svc nginx \
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--output=jsonpath='{range .spec.ports[0]}{.nodePort}')
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```
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Create a firewall rule that allows remote access to the `nginx` node port:
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```
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gcloud compute firewall-rules create kubernetes-the-hard-way-allow-nginx-service \
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--allow=tcp:${NODE_PORT} \
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--network kubernetes-the-hard-way
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```
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Retrieve the external IP address of a worker instance:
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```
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EXTERNAL_IP=$(gcloud compute instances describe worker-0 \
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--format 'value(networkInterfaces[0].accessConfigs[0].natIP)')
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```
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Make an HTTP request using the external IP address and the `nginx` node port:
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```
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curl -I http://${EXTERNAL_IP}:${NODE_PORT}
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```
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> output
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```
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HTTP/1.1 200 OK
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Server: nginx/1.19.1
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Date: Sat, 18 Jul 2020 07:16:41 GMT
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Content-Type: text/html
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Content-Length: 612
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Last-Modified: Tue, 07 Jul 2020 15:52:25 GMT
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Connection: keep-alive
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ETag: "5f049a39-264"
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Accept-Ranges: bytes
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```
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Next: [Cleaning Up](14-cleanup.md)
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