CyberAgent コンテナハンズオン
Dockerの復習
docker multi scale build
kubernetes
kubectl get ns , kubectl get namespace
context -> userのnamespaceや認証情報を束ねるもの
podsの起動
$ kubectl get pods
No resources found.
$
$ kubectl create -f sample-pod.yaml
pod "sample-pod" created
情報の確認
kubectl get pods -o wide
kubectl get pods -o json
kubectl get pods -o yaml
kubectl get pods --show-label
kubectl describe xxx
詳しいコマンドは4章を参照
podの作成や更新
kubectl apply -f sample-pod.yaml
podの作成のみ
kubectl create -f sample-pod.yaml
podsの削除
kubectl delete xxx
kubectl get pod ←保管が入る
Labelをodsにつけることで区別したり、ロードバランシングの切り替え
podsに入るとき
kubectl exec -it sample-pod bash
ENTRYPOINT/CMDとcommand/argsの対応づけ
| Docker | ENTRYPOINT | COMMAND |
|---|---|---|
| Kubenetes | command | args |
sample-2pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: sample-pod2
spec:
containers:
- name: nginx-container1
image: nginx:1.12
- name: nginx-container2
image: nginx:1.12
ReplicateSetについて
chapter05/sample-rs.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: sample-rs
spec:
replicas: 3
selector:
matchLabels:
app: sample-app
template:
metadata:
labels:
app: sample-app
spec:
containers:
- name: nginx-container
image: nginx:1.12
ports:
- containerPort: 80
RSでpodsの起動
$ kubectl apply -f sample-rs.yaml
$ kubectl get pods
$ k get pods
NAME READY STATUS RESTARTS AGE
sample-pod 1/1 Running 0 59m
sample-pod2 1/2 CrashLoopBackOff 8 19m
sample-rs-lpstg 1/1 Running 0 37s
sample-rs-pjhm2 1/1 Running 0 37s
sample-rs-z9mwb 1/1 Running 0 37s
Kubernetesのインストール https://github.com/kubernetes/minikube/releases
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
sudo dnf install kubernetes
Minikubeのインストール https://kubernetes.io/docs/tasks/tools/install-minikube/
curl -Lo minikube https://storage.googleapis.com/minikube/releases/v0.30.0/minikube-linux-amd64 && chmod +x minikube && sudo cp minikube /usr/local/bin/ && rm minikube
podsの状態を見ながら...
$ watch kubectl get pods
Every 2.0s: kubectl get pods gari: Sat Dec 1 15:05:19 2018
NAME READY STATUS RESTARTS AGE
sample-pod 1/1 Running 0 1h
sample-pod2 1/2 CrashLoopBackOff 9 25m
sample-rs-lpstg 1/1 Running 0 6m
sample-rs-z9mwb 1/1 Running 0 6m
RSでスケーリングする
$ kubectl scale --replicas 4 rs sample-rs
Every 2.0s: kubectl get pods gari: Sat Dec 1 15:06:48 2018
NAME READY STATUS RESTARTS AGE
sample-pod 1/1 Running 0 1h
sample-pod2 1/2 CrashLoopBackOff 9 26m
sample-rs-5v8bn 1/1 Running 0 28s
sample-rs-lpstg 1/1 Running 0 7m
sample-rs-wn6pc 1/1 Running 0 28s
sample-rs-z9mwb 1/1 Running 0 7m
# これは以下でも実現可能
$ kubectl get rs -w
$ kubectl delete pods sample-rs-z9mwb
Every 2.0s: kubectl get pods gari: Sat Dec 1 15:06:48 2018
NAME READY STATUS RESTARTS AGE
sample-pod 1/1 Running 0 1h
sample-pod2 1/2 CrashLoopBackOff 15 53m
sample-rs-f7flj 1/1 Running 0 5m
sample-rs-lpstg 1/1 Running 0 34m
sample-rs-n8vfm 1/1 Running 0 3m
sample-rs-wn6pc 1/1 Running 0 27m
レプリカセットはレプリカ数を指定してその数だけレプリカを起動しておくためのもの。
ロールバックと柔軟
$ kubectl set image deployment sample-deployment nginx-container=nginx:1.13
deployment.apps "sample-deployment" image updated
$ kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
sample-deployment 3 4 2 3 2m
Deployment
| ---- Replica
| ---- Replica
| ---- Replica
kubectl rollout undoで戻せる。--record をつけないと記録をしてくれない。ファイルをバージョン管理して apply で実行する。
基本的なポリシー： manifestを書いていく。
[gari:~/work_k8s/kubernetes-perfect-guide/samples/chapter06]$ k get pods
NAME READY STATUS RESTARTS AGE
sample-deployment-86d576464c-jjzw8 1/1 Running 0 2m
sample-deployment-86d576464c-jnv2x 1/1 Running 0 2m
sample-deployment-86d576464c-lnxbm 1/1 Running 0 2m
[gari:~/work_k8s/kubernetes-perfect-guide/samples/chapter06]$ k get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
sample-deployment-86d576464c-jjzw8 1/1 Running 0 2m 10.116.2.7 gke-ca-k8s-22-default-pool-7b781e37-xcmr
sample-deployment-86d576464c-jnv2x 1/1 Running 0 2m 10.116.0.18 gke-ca-k8s-22-default-pool-7b781e37-dp4k
sample-deployment-86d576464c-lnxbm 1/1 Running 0 2m 10.116.1.17 gke-ca-k8s-22-default-pool-7b781e37-0j2h
[gari:~/work_k8s/kubernetes-perfect-guide/samples/chapter06]$
[gari:~/work_k8s/kubernetes-perfect-guide/samples/chapter06]$
[gari:~/work_k8s/kubernetes-perfect-guide/samples/chapter06]$ k get service -w
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.119.240.1 <none> 443/TCP 8h
sample-lb LoadBalancer 10.119.246.206 <pending> 8080:30082/TCP 47s
sample-lb LoadBalancer 10.119.246.206 104.198.122.161 8080:30082/TCP 51s
HomeWork
Booted status
k get pods -L app,release
NAME READY STATUS RESTARTS AGE APP RELEASE
hw-nginx-96c686b56-4r8sh 1/1 Running 0 25s homework-ngx alpha
hw-nginx-96c686b56-6vshh 1/1 Running 0 25s homework-ngx alpha
hw-nginx-96c686b56-7vnw5 1/1 Running 0 25s homework-ngx alpha
hw-nginx-host-569d6f448-hf4xd 1/1 Running 0 25s homework-ngx beta
hw-nginx-host-569d6f448-qfxtl 1/1 Running 0 25s homework-ngx beta
hw-nginx-host-569d6f448-ztkwb 1/1 Running 0 25s homework-ngx beta
hw-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: hw-configmap
data:
index.html: |
hello world!
hw-nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: hw-nginx
spec:
replicas: 3
selector:
matchLabels:
app: homework-ngx
release: alpha
template:
metadata:
labels:
app: homework-ngx
release: alpha
spec:
containers:
- name: nginx-container
image: nginx:1.12
ports:
- containerPort: 80
volumeMounts:
- name: config-volume
mountPath: /usr/share/nginx/html
volumes:
- name: config-volume
configMap:
name: hw-configmap
hw-nginx-host-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: hw-nginx-host
spec:
replicas: 3
selector:
matchLabels:
app: homework-ngx
release: beta
template:
metadata:
labels:
app: homework-ngx
release: beta
spec:
containers:
- name: nginx-hostname-container
image: makocchi/docker-nginx-hostname:latest
ports:
- containerPort: 80
hw-lb.yaml
apiVersion: v1
kind: Service
metadata:
name: homework-lb
spec:
type: LoadBalancer
ports:
- name: "http-port-normal"
protocol: "TCP"
port: 8080
targetPort: 80
nodePort: 30080
selector:
app: homework-ngx
メモリやCPUの制限(抜粋)
resources:
requests:
memory: 1024Mi
cpu: 500m
limits:
memory: 2048Mi
cpu: 1000m
nodeの状態を確認する
k get nodes
NAME STATUS ROLES AGE VERSION
gke-ca-k8s-22-default-pool-7b781e37-0j2h Ready <none> 1d v1.11.2-gke.18
gke-ca-k8s-22-default-pool-7b781e37-dp4k Ready <none> 1d v1.11.2-gke.18
gke-ca-k8s-22-default-pool-7b781e37-xcmr Ready <none> 1d v1.11.2-gke.18
k describe node gke-ca-k8s-22-default-pool-7b781e37-0j2h
Name: gke-ca-k8s-22-default-pool-7b781e37-0j2h
Roles: <none>
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/fluentd-ds-ready=true
beta.kubernetes.io/instance-type=n1-standard-2
beta.kubernetes.io/masq-agent-ds-ready=true
beta.kubernetes.io/os=linux
cloud.google.com/gke-nodepool=default-pool
cloud.google.com/gke-os-distribution=cos
failure-domain.beta.kubernetes.io/region=asia-northeast1
failure-domain.beta.kubernetes.io/zone=asia-northeast1-a
kubernetes.io/hostname=gke-ca-k8s-22-default-pool-7b781e37-0j2h
projectcalico.org/ds-ready=true
Annotations: container.googleapis.com/instance_id=7900142075992893877
node.alpha.kubernetes.io/ttl=0
volumes.kubernetes.io/controller-managed-attach-detach=true
CreationTimestamp: Sat, 01 Dec 2018 09:38:21 +0900
Taints: <none>
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
FrequentUnregisterNetDevice False Sun, 02 Dec 2018 11:11:35 +0900 Sat, 01 Dec 2018 09:41:12 +0900 UnregisterNetDevice node is functioning properly
KernelDeadlock False Sun, 02 Dec 2018 11:11:35 +0900 Sat, 01 Dec 2018 09:36:10 +0900 KernelHasNoDeadlock kernel has no deadlock
NetworkUnavailable False Sat, 01 Dec 2018 09:38:40 +0900 Sat, 01 Dec 2018 09:38:40 +0900 RouteCreated RouteController created a route
OutOfDisk False Sun, 02 Dec 2018 11:11:53 +0900 Sat, 01 Dec 2018 09:38:21 +0900 KubeletHasSufficientDisk kubelet has sufficient disk space available
MemoryPressure False Sun, 02 Dec 2018 11:11:53 +0900 Sat, 01 Dec 2018 09:38:21 +0900 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sun, 02 Dec 2018 11:11:53 +0900 Sat, 01 Dec 2018 09:38:21 +0900 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sun, 02 Dec 2018 11:11:53 +0900 Sat, 01 Dec 2018 09:38:21 +0900 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sun, 02 Dec 2018 11:11:53 +0900 Sat, 01 Dec 2018 09:38:41 +0900 KubeletReady kubelet is posting ready status. AppArmor enabled
Addresses:
InternalIP: 10.146.15.218
ExternalIP: 35.189.154.83
Hostname: gke-ca-k8s-22-default-pool-7b781e37-0j2h
Capacity:
cpu: 2
ephemeral-storage: 98868448Ki
hugepages-2Mi: 0
memory: 7658156Ki
pods: 110
Allocatable:
cpu: 1930m
ephemeral-storage: 47093746742
hugepages-2Mi: 0
memory: 5778092Ki
pods: 110
System Info:
Machine ID: 6787c9c726acfaf745be0868a21e70cc
System UUID: 6787C9C7-26AC-FAF7-45BE-0868A21E70CC
Boot ID: c61fdcff-8e0e-4a5e-9594-27cbd7a64029
Kernel Version: 4.14.65+
OS Image: Container-Optimized OS from Google
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://17.3.2
Kubelet Version: v1.11.2-gke.18
Kube-Proxy Version: v1.11.2-gke.18
PodCIDR: 10.116.1.0/24
ExternalID: gke-ca-k8s-22-default-pool-7b781e37-0j2h
ProviderID: gce://cyberagent-239/asia-northeast1-a/gke-ca-k8s-22-default-pool-7b781e37-0j2h
Non-terminated Pods: (9 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits
--------- ---- ------------ ---------- --------------- -------------
default hw-nginx-96c686b56-4r8sh 100m (5%) 0 (0%) 0 (0%) 0 (0%)
default hw-nginx-host-569d6f448-hf4xd 100m (5%) 0 (0%) 0 (0%) 0 (0%)
default hw-nginx-host-569d6f448-ztkwb 100m (5%) 0 (0%) 0 (0%) 0 (0%)
kube-system calico-node-6rdhb 100m (5%) 0 (0%) 0 (0%) 0 (0%)
kube-system fluentd-gcp-v3.1.0-sjjkm 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system heapster-v1.6.0-beta.1-5fd4cdc95c-4w8ms 138m (7%) 138m (7%) 301856Ki (5%) 301856Ki (5%)
kube-system ip-masq-agent-6jqwq 10m (0%) 0 (0%) 16Mi (0%) 0 (0%)
kube-system kube-proxy-gke-ca-k8s-22-default-pool-7b781e37-0j2h 100m (5%) 0 (0%) 0 (0%) 0 (0%)
kube-system metrics-server-v0.2.1-fd596d746-jm8r2 53m (2%) 148m (7%) 154Mi (2%) 404Mi (7%)
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
CPU Requests CPU Limits Memory Requests Memory Limits
------------ ---------- --------------- -------------
701m (36%) 286m (14%) 475936Ki (8%) 715552Ki (12%)
Events: <none>
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ~/tls.key -out ~/tls.crt -subj "/CN=sample.example.com"
kubectl create secret tls --save-config tls-sample --key ~/tls.key --cert ~/tls.crt
kubectl apply -f sample-ingress-apps.yaml
kubectl apply -f sample-ingress.yaml
kubectl exec -it sample-ingress-apps-1 -- mkdir /usr/share/nginx/html/path1/
kubectl exec -it sample-ingress-apps-1 -- cp /etc/hostname /usr/share/nginx/html/path1/index.html
kubectl exec -it sample-ingress-apps-2 -- mkdir /usr/share/nginx/html/path2
kubectl exec -it sample-ingress-apps-2 -- cp /etc/hostname /usr/share/nginx/html/path2/index.html
（kubectl get ing でADDRESSが表示されるまでちょっと待つ）
INGRESS_IP=`kubectl get ingresses sample-ingress -o jsonpath='{.status.loadBalancer.ingress[0].ip}'`
（下記がうまく表示されない場合は、ちょっと待つ）
curl http://${INGRESS_IP}/path1/index.html -H "Host: sample.example.com"
青山真也/amsy810 [13:13]
ingressリソースの状態を確認（エラー起きてるかどうかなど）
kubectl describe ing
# kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
sample-ingress sample.example.com 35.244.196.127 80, 443 1h
k logs -f sample-ingress-apps-1