11. スモークテスト

kubectl create secret generic kubernetes-the-hard-way --from-literal="mykey=mydata"

ssh nob@kube-c01 "etcdctl get /registry/secrets/default/kubernetes-the-hard-way | hexdump -C"

$ ssh nob@kube-c01 "etcdctl get /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 15 21 b6 53 93 72 01  |:v1:key1:.!.S.r.|
00000050  c9 bc 8b bf 75 1e 35 f5  80 99 fc a5 69 98 ad 67  |....u.5.....i..g|
00000060  81 ec 22 0d 73 26 b0 d8  b4 ec a2 a0 47 89 da 5c  |..".s&......G..\|
00000070  3e 26 1b 7b 9b e9 ce 50  47 4e 62 80 7c d3 44 d6  |>&.{...PGNb.|.D.|
00000080  cc 2f 56 34 15 2d ad f0  3c ab ed 82 c6 fe c2 40  |./V4.-..<......@|
00000090  eb bb 55 6d 0f 16 de d9  df c1 67 b3 30 67 9e a3  |..Um......g.0g..|
000000a0  25 3b bc 00 34 4f 64 c6  33 ec ef 4a a1 ea 6b 95  |%;..4Od.3..J..k.|
000000b0  d9 7e 5f a5 20 36 bd f5  4b 91 2c e1 76 d6 35 f6  |.~_. 6..K.,.v.5.|
000000c0  75 36 c2 47 d2 73 95 6f  53 13 6f 61 d1 c4 2e 0b  |u6.G.s.oS.oa....|
000000d0  ea 7e e5 5b 7d bc 26 37  9f 72 58 78 d0 5c 07 f0  |.~.[}.&7.rXx.\..|
000000e0  65 83 a8 97 d7 c2 6f b2  06 85 66 a7 a0 dc 78 18  |e.....o...f...x.|
000000f0  e8 2a 79 c5 9e a4 b6 6c  e3 8c b4 80 94 43 35 b7  |.*y....l.....C5.|
00000100  21 76 27 f9 13 78 8d 0d  95 7f 70 be 98 01 ab 75  |!v'..x....p....u|
00000110  a0 b2 53 9b 1c 2a 05 d1  cb 59 59 1a ae e2 35 3b  |..S..*...YY...5;|
00000120  74 d0 41 07 21 bd 0f 96  35 e1 b9 05 67 0e f0 24  |t.A.!...5...g..$|
00000130  0c eb 38 16 c7 e8 eb 20  ec bc 36 e2 cc e6 ed 70  |..8.... ..6....p|
00000140  bc 92 69 ea c7 5c ae 5c  ed 17 9f be 67 b1 8d 8e  |..i..\.\....g...|
00000150  14 48 64 65 30 2a 8d 71  0e 0a                    |.Hde0*.q..|
0000015a

kubectl delete secret kubernetes-the-hard-way

kubectl create deployment nginx --image=nginx:latest

kubectl get pods -l app=nginx

$ kubectl get pods -l app=nginx
NAME                     READY   STATUS    RESTARTS   AGE
nginx-54c98b4f84-74nxt   1/1     Running   0          10s

kubectl expose deployment nginx --port 80 --type NodePort

kubectl get service -l app=nginx

$ kubectl get service -l app=nginx
NAME    TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
nginx   NodePort   10.0.0.197   <none>        80:32378/TCP   12s

NODE_PORT=$(kubectl get svc nginx --output=jsonpath='{range .spec.ports[0]}{.nodePort}')

NODE_NAME=$(kubectl get pods \
  -l app=nginx \
  -o jsonpath="{.items[0].spec.nodeName}")

curl -I http://${NODE_NAME}:${NODE_PORT}

$ curl -I http://${NODE_NAME}:${NODE_PORT}
HTTP/1.1 200 OK
Server: nginx/1.31.2
Date: Sun, 28 Jun 2026 08:51:28 GMT
Content-Type: text/html
Content-Length: 896
Last-Modified: Wed, 17 Jun 2026 14:40:35 GMT
Connection: keep-alive
ETag: "6a32b1e3-380"
Accept-Ranges: bytes

kubectl logs `kubectl get pods -l app=nginx -o jsonpath="{.items[0].metadata.name}"`

$ kubectl logs `kubectl get pods -l app=nginx -o jsonpath="{.items[0].metadata.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: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2026/06/28 08:51:03 [notice] 1#1: using the "epoll" event method
2026/06/28 08:51:03 [notice] 1#1: nginx/1.31.2
2026/06/28 08:51:03 [notice] 1#1: built by gcc 14.2.0 (Debian 14.2.0-19)
2026/06/28 08:51:03 [notice] 1#1: OS: Linux 7.0.0-1006-aws
2026/06/28 08:51:03 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2026/06/28 08:51:03 [notice] 1#1: start worker processes
2026/06/28 08:51:03 [notice] 1#1: start worker process 29
2026/06/28 08:51:03 [notice] 1#1: start worker process 30
10.200.0.1 - - [28/Jun/2026:08:51:28 +0000] "HEAD / HTTP/1.1" 200 0 "-" "curl/8.18.0" "-"

kubectl delete deployment nginx
kubectl delete service nginx