Kubernetes 实战教学，手把手教您用2个脚本在 PWK 上启用 Compose
出品丨Docker公司（ID：docker-cn）
编译丨小东
每周一、三、五，与您不见不散！
在 Dockercon 的第二天，Docker 在 Kubernetes 项目上开源了 Compose。这个工具无疑可以简化 Kubernetes。如果您不知道，Docker 企业版已经在 Compose File 3.3 版本中启用了这个功能，它可以让您使用相同的 docker-compose.yml 文件进行 Swarm 部署，也可以在部署应用栈时指定 Kubernetes 工作负载。
两周前，我注意到社区中有人要求在 Kubernetes Playground 上运行 Compose on Kubernetes。出于我的兴趣，我开始研究如何简化解决方案，以便任何人都能在短时间内轻松地设置它。我创建了镜像仓库，并开始构建一个简单的脚本和 Makefile 来启动它并在 PWK 上运行。点击下列文章标题，查看详情：
在这篇博文中，我将向您演示如何使用2个脚本就可以在 Play with Kubernetes 平台上启用 Compose on Kubernetes。接下来，让我们开始吧！
首先，浏览 https://labs.play-with-k8s.com/ 访问Kubernetes Playground。
单击“Login”按钮，并使用 Docker Hub 或 GitHub ID 进行身份验证。
一旦开始会话，您将拥有一个自己的实验室环境。
添加第一个 Kubernetes 节点
单击左侧的“Add New Instance” 来建您的第一个 Kubernetes 集群节点。它会自动将其命名为“node1”。每个实例都预装了Docker Community Edition（CE）和Kubeadm。该节点将被视为我们群集的主节点。
引导主节点
克隆镜像仓库并在第一个实例上运行此脚本：
git clone https://github.com/collabnix/compose-on-kubernetes
cd compose-on-kubernetes/scripts/pwk/
sh bootstrap-pwk.sh
当您执行此脚本时，作为初始化的一部分，kubeadm 会编写所需的几个配置文件，设置 RBAC 并部署 Kubernetes 控制平面组件（如 kube-apiserver、kube-dns、kube-proxy 和 etcd 等）。控制平面组件部署为 Docker 容器。
复制上面的 kubeadm 连接令牌命令并将其保存，以供下一步使用。此命令将用于将其他节点加入群集。
添加工作节点
点击“Add New Node”来添加一个新的工作节点。
检查集群状态
[node1 ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
node1 Ready master 18m v1.11.3
node2 Ready 4m v1.11.3
node3 Ready 39s v1.11.3
node4 NotReady 22s v1.11.3
node5 NotReady 4s v1.11.3
[node1 ]$ kubectl get po
No resources found.
[node1 ]$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 443/TCP 1h
执行以下脚本，一次性设置好 Compose Namespace、etcd cluster 和 Compose controller：
chmod +x prepare-pwk.sh
sh prepare-pwk.sh
[node1 pwk]$ sh prepare-pwk.sh
Creating Compose Namespace...
namespace/compose created
Installing Helm...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 21.6M 100 21.6M 0 0 25.3M 0 --:--:-- --:--:-- --:--:-- 25.4M
Preparing Helm
linux-amd64/
linux-amd64/tiller
linux-amd64/helm
linux-amd64/LICENSE
linux-amd64/README.md
Creating tiller under kube-system namespace...
serviceaccount/tiller created
clusterrolebinding.rbac.authorization.k8s.io/tiller-cluster-rule created
Creating /root/.helm
Creating /root/.helm/repository
Creating /root/.helm/repository/cache
Creating /root/.helm/repository/local
Creating /root/.helm/plugins
Creating /root/.helm/starters
Creating /root/.helm/cache/archive
Creating /root/.helm/repository/repositories.yaml
Adding stable repo with URL: https://kubernetes-charts.storage.googleapis.com
Adding local repo with URL: http://127.0.0.1:8879/charts
$HELM_HOME has been configured at /root/.helm.
Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster.
Please note: by default, Tiller is deployed with an insecure 'allow unauthenticated users' policy.
To prevent this, run `helm init` with the --tiller-tls-verify flag.
For more information on securing your installation see: https://docs.helm.sh/using_helm/#securing-your-helm-installation
Happy Helming!
Tiller is still coming up...Please Wait
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-699fx 1/1 Running 0 5m
coredns-78fcdf6894-trslx 1/1 Running 0 5m
etcd-node1 1/1 Running 0 4m
kube-apiserver-node1 1/1 Running 0 4m
kube-controller-manager-node1 1/1 Running 0 4m
kube-proxy-5gskp 1/1 Running 0 4m
kube-proxy-5hbkb 1/1 Running 0 5m
kube-proxy-lcsnz 1/1 Running 0 4m
kube-scheduler-node1 1/1 Running 0 4m
tiller-deploy-85744d9bfb-bjw2f 0/1 Running 0 15s
weave-net-9vt2s 2/2 Running 1 4m
weave-net-k87d7 2/2 Running 0 5m
weave-net-nmmt5 2/2 Running 0 4m
NAME: etcd-operator
LAST DEPLOYED: Mon Jan 21 14:27:50 2019
NAMESPACE: compose
STATUS: DEPLOYED
RESOURCES:
==> v1/ServiceAccount
NAME SECRETS AGE
etcd-operator-etcd-operator-etcd-backup-operator 1 4s
etcd-operator-etcd-operator-etcd-operator 1 4s
etcd-operator-etcd-operator-etcd-restore-operator 1 4s
==> v1beta1/ClusterRole
NAME AGE
etcd-operator-etcd-operator-etcd-operator 4s
==> v1beta1/ClusterRoleBinding
NAME AGE
etcd-operator-etcd-operator-etcd-backup-operator 4s
etcd-operator-etcd-operator-etcd-operator 3s
etcd-operator-etcd-operator-etcd-restore-operator 3s
==> v1/Service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
etcd-restore-operator ClusterIP 10.108.89.92 19999/TCP 3s
==> v1beta2/Deployment
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
etcd-operator-etcd-operator-etcd-backup-operator 1 1 1 0 3s
etcd-operator-etcd-operator-etcd-operator 1 1 1 0 3s
etcd-operator-etcd-operator-etcd-restore-operator 1 1 1 0 3s
==> v1/Pod(related)
NAME READY STATUS RESTARTS AGE
etcd-operator-etcd-operator-etcd-backup-operator-56fd448cd897mk 0/1 ContainerCreating 0 2s
etcd-operator-etcd-operator-etcd-operator-c5b8b8f74-pttr2 0/1 ContainerCreating 0 2s
etcd-operator-etcd-operator-etcd-restore-operator-58587cdc9g4br 0/1 ContainerCreating 0 2s
NOTES:
1. etcd-operator deployed.
If you would like to deploy an etcd-cluster set cluster.enabled to true in values.yaml
Check the etcd-operator logs
export POD=$(kubectl get pods -l app=etcd-operator-etcd-operator-etcd-operator --namespacecompose --output name)
kubectl logs $POD --namespace=compose
Loaded plugins: fastestmirror, ovl
base | 3.6 kB 00:00:00
docker-ce-stable | 3.5 kB 00:00:00
extras | 3.4 kB 00:00:00
kubernetes/signature | 454 B 00:00:00
kubernetes/signature | 1.4 kB 00:00:10 !!!
updates | 3.4 kB 00:00:00
(1/7): base/7/x86_64/group_gz | 166 kB 00:00:00
(2/7): extras/7/x86_64/primary_db | 156 kB 00:00:00
(3/7): base/7/x86_64/primary_db | 6.0 MB 00:00:00
(4/7): updates/7/x86_64/primary_db | 1.3 MB 00:00:00
(5/7): docker-ce-stable/x86_64/primary_db | 20 kB 00:00:00
(6/7): docker-ce-stable/x86_64/updateinfo | 55 B 00:00:01
(7/7): kubernetes/primary | 42 kB 00:00:01
Determining fastest mirrors
* base: mirror.nl.datapacket.com
* extras: mirror.nl.datapacket.com
* updates: mirror.denit.net
kubernetes 305/305
Resolving Dependencies
--> Running transaction check
---> Package wget.x86_64 0:1.14-18.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===============================================================================================
Package Arch Version Repository Size
===============================================================================================
Installing:
wget x86_64 1.14-18.el7 base 547 k
Transaction Summary
===============================================================================================
Install 1 Package
Total download size: 547 k
Installed size: 2.0 M
Downloading packages:
wget-1.14-18.el7.x86_64.rpm | 547 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : wget-1.14-18.el7.x86_64 1/1
install-info: No such file or directory for /usr/share/info/wget.info.gz
Verifying : wget-1.14-18.el7.x86_64 1/1
Installed:
wget.x86_64 0:1.14-18.el7
Complete!
$HELM_HOME has been configured at /root/.helm.
Tiller (the Helm server-side component) has been upgraded to the current version.
Happy Helming!
etcdcluster.etcd.database.coreos.com/compose-etcd created
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-699fx 1/1 Running 0 6m
coredns-78fcdf6894-trslx 1/1 Running 0 6m
etcd-node1 1/1 Running 0 5m
kube-apiserver-node1 1/1 Running 0 6m
kube-controller-manager-node1 1/1 Running 0 5m
kube-proxy-5gskp 1/1 Running 0 6m
kube-proxy-5hbkb 1/1 Running 0 6m
kube-proxy-lcsnz 1/1 Running 0 5m
kube-scheduler-node1 1/1 Running 0 5m
tiller-deploy-85744d9bfb-bjw2f 1/1 Running 0 1m
weave-net-9vt2s 2/2 Running 1 6m
weave-net-k87d7 2/2 Running 0 6m
weave-net-nmmt5 2/2 Running 0 5m
--2019-01-21 14:28:49-- https://github.com/docker/compose-on-kubernetes/releases/download/v0.4.18/installer-linux
Resolving github.com (github.com)... 140.82.118.3, 140.82.118.4
Connecting to github.com (github.com)|140.82.118.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/158560458/e9a86500-15b2-11e9-8620-1eec5bf160e3?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190121T142850Z&X-Amz-Expires=300&X-Amz-Signature=bd4020beb0f68210e2a3cfa8ca8166dddcf1d1e4868737eb9ad83363cd39c660&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dinstaller-linux&response-content-type=application%2Foctet-stream [following]
--2019-01-21 14:28:50-- https://github-production-release-asset-2e65be.s3.amazonaws.com/158560458/e9a86500-15b2-11e9-8620-1eec5bf160e3?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190121T142850Z&X-Amz-Expires=300&X-Amz-Signature=bd4020beb0f68210e2a3cfa8ca8166dddcf1d1e4868737eb9ad83363cd39c660&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dinstaller-linux&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.216.161.163
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.216.161.163|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 28376064 (27M) [application/octet-stream]
Saving to: 'installer-linux'
100%[=====================================================>] 28,376,064 15.9MB/s in 1.7s
2019-01-21 14:28:52 (15.9 MB/s) - 'installer-linux' saved [28376064/28376064]
INFO[0000] Checking installation state
INFO[0000] Install image with tag "v0.4.18" in namespace "compose"
INFO[0000] Api server: image: "docker/kube-compose-api-server:v0.4.18", pullPolicy: "Always"
INFO[0001] Controller: image: "docker/kube-compose-controller:v0.4.18", pullPolicy: "Always"
failed to find a Stack API version
error: the server doesn't have a resource type "stacks"
[node1 pwk]$ sh prepare-pwk.sh
Creating Compose Namespace...
Installing Helm...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 21.6M 100 21.6M 0 0 14.9M 0 0:00:01 0:00:01 --:--:-- 14.9M
Preparing Helm
linux-amd64/
linux-amd64/tiller
linux-amd64/helm
linux-amd64/LICENSE
linux-amd64/README.md
Creating tiller under kube-system namespace...
clusterrolebindings.rbac.authorization.k8s.io "tiller-cluster-rule" already exists
$HELM_HOME has been configured at /root/.helm.
Tiller (the Helm server-side component) has been upgraded to the current version.
Happy Helming!
Tiller is still coming up...Please Wait
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-699fx 1/1 Running 0 7m
coredns-78fcdf6894-trslx 1/1 Running 0 7m
etcd-node1 1/1 Running 0 6m
kube-apiserver-node1 1/1 Running 0 6m
kube-controller-manager-node1 1/1 Running 0 6m
kube-proxy-5gskp 1/1 Running 0 6m
kube-proxy-5hbkb 1/1 Running 0 7m
kube-proxy-lcsnz 1/1 Running 0 6m
kube-scheduler-node1 1/1 Running 0 6m
tiller-deploy-85744d9bfb-bjw2f 1/1 Running 0 2m
weave-net-9vt2s 2/2 Running 1 6m
weave-net-k87d7 2/2 Running 0 7m
weave-net-nmmt5 2/2 Running 0 6m
NAME REVISION UPDATED STATUS CHART APP VERSION NAMESPACE
etcd-operator 1 Mon Jan 21 14:27:50 2019 DEPLOYED etcd-operator-0.8.3 0.9.3 compose
Run: helm ls --all etcd-operator; to check the status of the release
Or run: helm del --purge etcd-operator; to delete it
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
* base: mirror.nl.datapacket.com
* extras: mirror.nl.datapacket.com
* updates: mirror.denit.net
Package wget-1.14-18.el7.x86_64 already installed and latest version
Nothing to do
$HELM_HOME has been configured at /root/.helm.
Tiller (the Helm server-side component) has been upgraded to the current version.
Happy Helming!
etcdcluster.etcd.database.coreos.com/compose-etcd unchanged
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-699fx 1/1 Running 0 7m
coredns-78fcdf6894-trslx 1/1 Running 0 7m
etcd-node1 1/1 Running 0 6m
kube-apiserver-node1 1/1 Running 0 7m
kube-controller-manager-node1 1/1 Running 0 7m
kube-proxy-5gskp 1/1 Running 0 7m
kube-proxy-5hbkb 1/1 Running 0 7m
kube-proxy-lcsnz 1/1 Running 0 6m
kube-scheduler-node1 1/1 Running 0 6m
tiller-deploy-85744d9bfb-bjw2f 1/1 Running 0 2m
weave-net-9vt2s 2/2 Running 1 7m
weave-net-k87d7 2/2 Running 0 7m
weave-net-nmmt5 2/2 Running 0 6m
--2019-01-21 14:30:05-- https://github.com/docker/compose-on-kubernetes/releases/download/v0.4.18/installer-linux
Resolving github.com (github.com)... 140.82.118.3, 140.82.118.4
Connecting to github.com (github.com)|140.82.118.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/158560458/e9a86500-15b2-11e9-8620-1eec5bf160e3?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190121T143006Z&X-Amz-Expires=300&X-Amz-Signature=53d5f390f91b968a53219512c18b696e1a085cbbd59cdb953ca95bea1aca4d60&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dinstaller-linux&response-content-type=application%2Foctet-stream [following]
--2019-01-21 14:30:06-- https://github-production-release-asset-2e65be.s3.amazonaws.com/158560458/e9a86500-15b2-11e9-8620-1eec5bf160e3?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190121T143006Z&X-Amz-Expires=300&X-Amz-Signature=53d5f390f91b968a53219512c18b696e1a085cbbd59cdb953ca95bea1aca4d60&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dinstaller-linux&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.216.233.59
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.216.233.59|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 28376064 (27M) [application/octet-stream]
Saving to: 'installer-linux.1'
100%[=====================================================>] 28,376,064 16.3MB/s in 1.7s
2019-01-21 14:30:08 (16.3 MB/s) - 'installer-linux.1' saved [28376064/28376064]
INFO[0000] Checking installation state
INFO[0001] Compose version v0.4.18 is already installed in namespace "compose" with the same settings
compose.docker.com/v1beta1
compose.docker.com/v1beta2
Waiting for the stack to be stable and running...
db1: Pending [pod status: 0/2 ready, 2/2 pending, 0/2 failed]
web1: Pending [pod status: 0/3 ready, 3/3 pending, 0/3 failed]
db1: Ready [pod status: 1/2 ready, 1/2 pending, 0/2 failed]
web1: Ready [pod status: 1/3 ready, 2/3 pending, 0/3 failed]
Stack hellostack is stable and running
NAME SERVICES PORTS STATUS CREATED AT
hellostack 2 web1: 8082 Progressing (Stack is starting) 2019-01-21T14:30:10Z
验证 Stack
[node1 pwk]$ kubectl get stack
NAME SERVICES PORTS STATUS CREATED AT
hellostack 2 web1: 8082 Available (Stack is started) 2019-01-21T14:30:10Z
