[HARDWAY] 99.Smoke Test

https://github.com/kelseyhightower/kubernetes-the-hard-way/blob/master/docs/13-smoke-test.md

### Kubernetes Secret Data 암호화 검증

[root@master01 ~]# kubectl create secret generic kubernetes-the-hard-way \

>   --from-literal="mykey=mydata"

secret/kubernetes-the-hard-way created

[root@master01 ~]# etcdctl get \

>   --endpoints=https://127.0.0.1:2379 \

>   --cacert=/etc/etcd/ca.pem \

>   --cert=/etc/etcd/kubernetes.pem \

>   --key=/etc/etcd/kubernetes-key.pem\

>   /registry/secrets/default/kubernetes-the-hard-way | hexdump -C

00000000  2f 72 65 67 69 73 74 72  79 2f 73 65 63 72 65 74  |/registry/secret|

00000010  73 2f 64 65 66 61 75 6c  74 2f 6b 75 62 65 72 6e  |s/default/kubern|

00000020  65 74 65 73 2d 74 68 65  2d 68 61 72 64 2d 77 61  |etes-the-hard-wa|

00000030  79 0a 6b 38 73 3a 65 6e  63 3a 61 65 73 63 62 63  |y.k8s:enc:aescbc|

00000040  3a 76 31 3a 6b 65 79 31  3a c2 ae 58 49 5f c0 60  |:v1:key1:..XI_.`|

00000050  98 52 10 83 c8 40 ab b3  f6 cd fa d9 30 f7 c1 bc  |.R...@......0...|

00000060  89 6c 43 12 7b 75 8f 93  75 60 dc 83 68 14 4c 25  |.lC.{u..u`..h.L%|

00000070  e6 bf b1 b3 3b 0c cd 09  88 db ac d2 bd 1e 9f e6  |....;...........|

00000080  4b e4 5d fd ab 00 88 47  48 67 32 b6 f7 e5 fc 4a  |K.]....GHg2....J|

00000090  26 f8 73 46 aa 31 3a c8  4d fb bc dc 9a 69 55 63  |&.sF.1:.M....iUc|

000000a0  6a 13 17 cc f0 36 27 4b  23 d5 7e c4 a5 4a fb 6b  |j....6'K#.~..J.k|

000000b0  67 10 e6 83 54 46 26 80  72 7f ab c5 01 f4 f8 e3  |g...TF&.r.......|

000000c0  ba da ce 12 2c 2d ec 47  ad bf 64 cf fb 9a 57 ce  |....,-.G..d...W.|

000000d0  c4 57 91 54 09 1c 72 13  cd 84 6a eb 0a 40 28 bb  |.W.T..r...j..@(.|

000000e0  45 48 1f 10 16 d5 33 03  2f a3 78 ca 56 71 78 d9  |EH....3./.x.Vqx.|

000000f0  73 a6 67 38 6d 31 b8 66  f6 c8 c6 7f b8 b2 32 be  |s.g8m1.f......2.|

00000100  d8 82 fe b1 c3 dd b4 6d  ba 47 9b 85 18 0c f8 48  |.......m.G.....H|

00000110  84 24 a0 10 f5 54 6a b0  0e dd f7 37 d0 9c fa 6a  |.$...Tj....7...j|

00000120  a2 eb a6 58 b6 fa 65 72  44 ae bc d3 46 e1 cd 1e  |...X..erD...F...|

00000130  29 bc fc 05 dc e4 f0 48  af 32 18 29 a5 25 30 13  |)......H.2.).%0.|

00000140  28 e8 1c b5 6e bb b8 25  3d 0a                    |(...n..%=.|

0000014a

[root@master01 ~]#

### 배포 검증

[root@master01 ~]# kubectl create deployment nginx --image=nginx

deployment.apps/nginx created

[root@master01 ~]# kubectl get pods -l app=nginx

NAME                    READY   STATUS    RESTARTS   AGE

nginx-f89759699-pn6sw   1/1     Running   0          6s

[root@master01 ~]# 

### Port Forwarding 검증

[root@master01 ~]# POD_NAME=$(kubectl get pods -l app=nginx -o jsonpath="{.items[0].metadata.name}")

[root@master01 ~]# 

[root@master01 ~]# kubectl port-forward $POD_NAME 8080:80

Forwarding from [::1]:8080 -> 80

### New Terminal

[root@master01 ~]# curl --head http://127.0.0.1:8080

HTTP/1.1 200 OK

Cache-Control: no-cache, private

Content-Type: application/json

Date: Wed, 02 Dec 2020 09:57:06 GMT

[root@master01 ~]# 

### 기존 Terminal

^C[root@master01 ~]# 

### 로그 확인

[root@master01 ~]# kubectl logs $POD_NAME

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration

/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/

/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh

10-listen-on-ipv6-by-default.sh: Getting the checksum of /etc/nginx/conf.d/default.conf

10-listen-on-ipv6-by-default.sh: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf

/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh

/docker-entrypoint.sh: Configuration complete; ready for start up

### Pod EXEC 확인

[root@master01 ~]# kubectl exec -ti $POD_NAME -- nginx -v

nginx version: nginx/1.19.5

[root@master01 ~]# 

### SERVICE 확인

[root@master01 ~]# kubectl expose deployment nginx --port 80 --type NodePort

service/nginx exposed

[root@master01 ~]# NODE_PORT=$(kubectl get svc nginx \

>   --output=jsonpath='{range .spec.ports[0]}{.nodePort}')

[root@master01 ~]# kubectl get pod

NAME                    READY   STATUS    RESTARTS   AGE

busybox                 1/1     Running   0          15m

nginx-f89759699-pn6sw   1/1     Running   0          8m29s

[root@master01 ~]# kubectl describe pod nginx-f89759699-pn6sw | grep Node:

Node:         worker01/192.168.1.57

[root@master01 ~]# curl -I http://192.168.1.57:${NODE_PORT}

HTTP/1.1 200 OK

Server: nginx/1.19.5

Date: Wed, 02 Dec 2020 10:04:38 GMT

Content-Type: text/html

Content-Length: 612

Last-Modified: Tue, 24 Nov 2020 13:02:03 GMT

Connection: keep-alive

ETag: "5fbd044b-264"

Accept-Ranges: bytes