k8s开发环境

在搭建开发环境之前， 请Try Kubernetes，Get Started and CONCEPTS

可以自己使用minikube 来搭建个环境， 自己玩一玩。

K8s需要一些依赖。 参看官方文档

https://github.com/kubernetes/community/blob/master/contributors/devel/running-locally.md

1. 需要安装 linux

2. 安装docker

wget -O- https://get.docker.com/ |bash

sudo usermod -aG docker $USER

3. 安装etcd

hack/install-etcd.sh  # Installs in ./third_party/etcd

echo "export PATH=\"\$PATH:$(pwd)/third_party/etcd\"" >> ~/.profile  # Add to PATH

4. 安装go

sudo add-apt-repository ppa:gophers/archive
sudo apt update
sudo apt-get install golang-1.9-go

cat >> ~/.profile <<<'
GOROOT=`go env |grep "GOROOT" |cut -d "=" -f2`
GOROOT=${GOROOT#\"}
GOROOT=${GOROOT%\"}

GOPATH=`go env |grep GOPATH |cut -d "=" -f 2`
GOPATH=${GOPATH%\"}
GOPATH=${GOPATH#\"}'

echo "export PATH=\$PATH:/usr/lib/go-1.9/bin" >> ~/.profile
source ~/.profile

5. 安装 openssl

6. 安装 CFSSL

go get -u github.com/cloudflare/cfssl/cmd/...

echo "export PATH=\$PATH:\$GOPATH/bin" >> ~/.profile

source ~/.profile

7. 下载源码

git clone --depth=1 https://github.com/kubernetes/kubernetes.git

8. 编译安装k8s

cd kubernetes

hack/local-up-cluster.sh

9. 可以开发了。

请参看 devel  重点 coding-conventions

go调试， 请参考 golang debug， 推荐使用Delve

=============================

参考文档：

https://kubernetes.io/

开发者主要看看： Community 和 Documentation

附录:

编译过程:

$ hack/local-up-cluster.sh
WARNING : The kubelet is configured to not fail if swap is enabled; production deployments should disable swap.
WARNING : This script MAY be run as root for docker socket / iptables functionality; if failures occur, retry as root.
make: Entering directory '/home/ubuntu/kubernetes'
make[]: Entering directory '/home/ubuntu/kubernetes'
+++ [ ::] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
    k8s.io/kubernetes/vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [ ::] Generating bindata:
    test/e2e/generated/gobindata_util.go
~/kubernetes ~/kubernetes/test/e2e/generated
~/kubernetes/test/e2e/generated
+++ [ ::] Building go targets for linux/amd64:
    ./vendor/k8s.io/code-generator/cmd/deepcopy-gen
+++ [ ::] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
    k8s.io/kubernetes/vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [ ::] Generating bindata:
    test/e2e/generated/gobindata_util.go
~/kubernetes ~/kubernetes/test/e2e/generated
~/kubernetes/test/e2e/generated
+++ [ ::] Building go targets for linux/amd64:
    ./vendor/k8s.io/code-generator/cmd/defaulter-gen
+++ [ ::] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
    k8s.io/kubernetes/vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [ ::] Generating bindata:
    test/e2e/generated/gobindata_util.go
~/kubernetes ~/kubernetes/test/e2e/generated
~/kubernetes/test/e2e/generated
+++ [ ::] Building go targets for linux/amd64:
    ./vendor/k8s.io/code-generator/cmd/conversion-gen
+++ [ ::] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
    k8s.io/kubernetes/vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [ ::] Generating bindata:
    test/e2e/generated/gobindata_util.go
~/kubernetes ~/kubernetes/test/e2e/generated
~/kubernetes/test/e2e/generated
+++ [ ::] Building go targets for linux/amd64:
    ./vendor/k8s.io/code-generator/cmd/openapi-gen
make[]: Leaving directory '/home/ubuntu/kubernetes'
+++ [ ::] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
    k8s.io/kubernetes/vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [ ::] Generating bindata:
    test/e2e/generated/gobindata_util.go
~/kubernetes ~/kubernetes/test/e2e/generated
~/kubernetes/test/e2e/generated
+++ [ ::] Building go targets for linux/amd64:
    cmd/kubectl
    cmd/hyperkube
+++ [ ::] +++ Warning: stdlib pkg with cgo flag not found.
+++ [ ::] +++ Warning: stdlib pkg cannot be rebuilt since /usr/lib/go-1.9/pkg is not writable by ubuntu
+++ [ ::] +++ Warning: Make /usr/lib/go-1.9/pkg writable for ubuntu for a one-time stdlib install, Or
+++ [ ::] +++ Warning: Rebuild stdlib using the command 'CGO_ENABLED=0 go install -a -installsuffix cgo std'
+++ [ ::] +++ Falling back to go build, which is slower
    **
make: Leaving directory '/home/ubuntu/kubernetes'
WARNING: No swap limit support
Kubelet cgroup driver defaulted to use: cgroupfs
API SERVER insecure port is free, proceeding...
API SERVER secure port is free, proceeding...
Detected host and ready to start services.  Doing some housekeeping first...
Using GO_OUT /home/ubuntu/kubernetes/_output/local/bin/linux/amd64
Starting services now!
Starting etcd
etcd --advertise-client-urls http://127.0.0.1:2379 --data-dir /tmp/tmp.lG7Vdi3iOj --listen-client-urls http://127.0.0.1:2379 --debug > "/dev/null" 2>/dev/null
Waiting for etcd to come up.
+++ [ ::] On try , etcd: : http://127.0.0.1:2379
{"action":"set","node":{"key":"/_test","value":"","modifiedIndex":,"createdIndex":}}
Generating a  bit RSA private key
...............+++
.....................................................................................................................+++
writing new private key to '/var/run/kubernetes/server-ca.key'
-----
Generating a  bit RSA private key
..................+++
................................................+++
writing new private key to '/var/run/kubernetes/client-ca.key'
-----
Generating a  bit RSA private key
....................................................................+++
.....................................+++
writing new private key to '/var/run/kubernetes/request-header-ca.key'
-----
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
// :: [INFO] generate received request
// :: [INFO] received CSR
// :: [INFO] generating key: rsa-
// :: [INFO] encoded CSR
// :: [INFO] signed certificate with serial number
Waiting for apiserver to come up
+++ [ ::] On try , apiserver: : ok
Cluster "local-up-cluster" set.
use 'kubectl --kubeconfig=/var/run/kubernetes/admin-kube-aggregator.kubeconfig' to use the aggregated API server
service "kube-dns" created
serviceaccount "kube-dns" created
configmap "kube-dns" created
deployment "kube-dns" created
Kube-dns addon successfully deployed.
kubelet (  ) is running.
Create default storage class for
storageclass "standard" created
Local Kubernetes cluster is running. Press Ctrl-C to shut it down.

Logs:
  /tmp/kube-apiserver.log
  /tmp/kube-controller-manager.log
  /tmp/kube-proxy.log
  /tmp/kube-scheduler.log
  /tmp/kubelet.log

To start using your cluster, you can open up another terminal/tab and run:

  export KUBECONFIG=/var/run/kubernetes/admin.kubeconfig
  cluster/kubectl.sh

Alternatively, you can write to the default kubeconfig:

  export KUBERNETES_PROVIDER=local

  cluster/kubectl.sh config set-cluster local --server=https://localhost:6443 --certificate-authority=/var/run/kubernetes/server-ca.crt
  cluster/kubectl.sh config set-credentials myself --client-key=/var/run/kubernetes/client-admin.key --client-certificate=/var/run/kubernetes/client-admin.crt
  cluster/kubectl.sh config set-context local --cluster=local --user=myself
  cluster/kubectl.sh config use-context local
  cluster/kubectl.sh