システム部第一課の小浜です。
今回はシングルノードのKubernetesクラスタをWindows上で作成しみてます。
KubernetesはDockerコンテナ実行環境のオーケストレーションツールです。
管弦楽団のオーケストラを想像してもらうとわかりやすいかもしれません。
Dockerコンテナが100個近く走行するようになると、人力では管理しきれなくなってきます。
そこで、コンテナの管理を手助けするツールがKubernetesです。
参考文献
- Kubernetes 1.10をスクラッチから全手動で構築 | To Be Decided
https://www.kaitoy.xyz/2018/04/17/kubernetes110-from-scratch/
基本的にこのサイトの内容を踏襲しています。 -
Kubernetes1.8のクラスタを構築する。kubeadmで。 | To Be Decided
https://www.kaitoy.xyz/2017/10/21/build-kubernetes-cluster-by-kubeadm/ -
kubeadmが何をやっているのかみてみた – Qiita
https://qiita.com/helix_kaz/items/9c4a83532f949d8a94ef -
kubeadm で kubernetes v1.8 + Flannel をインストール – Qiita
https://qiita.com/hichihara/items/79ef6613026f8c13eb99 -
ansibleでkubernetes環境の構築 1 – Qiita
https://qiita.com/tsukasa1301/items/56516f4cf7855308d259 -
ansibleでkubernetes環境の構築 2 – Qiita
https://qiita.com/tsukasa1301/items/d0eae29be0a4cd34a740 -
VagrantでVirtualBoxのデフォルトNATネットワークのアドレスを変更する – 雑記帳(2015-11-02)
http://muramasa64.fprog.org/diary/?date=20151102#p01 -
Get Docker CE for CentOS #INSTALL DOCKER CE
https://docs.docker.com/install/linux/docker-ce/centos/#install-docker-ce-1
前提とする構成
- Windows 10 Pro version 1803 Hyper-Vは使用しません。
- Vagrant 2.1.2
- VirtualBox バージョン 5.2.18 r124319 (Qt5.6.2)
- Windows機のメモリは6GB以上を想定しています。
作成する構成
- Docker version 18.03.1-ce
- Kubernetes version 1.10.6
- VirtualBoxで作成する仮想マシンのうち、一つ目のネットワークアダプタは通常のNAT型とし、２つ目のネットワークアダプタをホストオンリー型に設定して、ホストPCからIPアドレス192.168.33.10を宛先とすると仮想マシンに通信可能なように構成します。(NATのみだと、仮想マシン内部に建てたサービスにアクセスするためにポートフォワード設定が必要になるため）
セットアップ準備
Windowsにvagrantをインストールするため、chocolateyを使用します。
Chocolatey – The package manager for Windows
https://chocolatey.org/
chocolateyはWindows向けのパッケージマネージャーです。
Mac OS Xで言うところのHomebrewのようなもので、Microsoft公式提供ではありませんが、色々なソフトウェアをコマンドラインからインストールすることができます。
chocolateyのインストールを行います。管理者権限で起動したWindows PowerShellから以下を入力します。
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Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
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次に、VirtualBoxをインストールします。
VirtualBoxはOracle提供のOS仮想化アプリケーションです。
WindowsのHyper-Vはハイパーバイザー型でホストOSのWindowsも内部的には仮想化されますが、VirtualBoxは仮想化アプリケーションなのでホストOS上で動作します。
vagrantもインストールします。
vagrantはコマンドラインからVirtualBoxなどの仮想化アプリケーションを操作するラッパーコマンドです。
最新版の2.1.5は動作がおかしいようなので、ここではバージョン2.1.2を指定してインストールします。
管理者権限で起動したWindows PowerShellから以下を入力します。
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choco install -y virtualbox
choco install -y vagrant --version 2.1.2 --force
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ここで、管理者権限で起動したWindows PowerShellを終了します。
ここで、新しくWindows PowerShellを起動します。
vagrantを使用して、CentOS7イメージを取得します。
参考: Documentation – Vagrant by HashiCorp
https://www.vagrantup.com/docs/index.html
vagrant + virtualbox を使う場合は、ユーザー権限で起動したPowerShellから操作を行います。
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# centos7イメージの取得
vagrant box add centos/7 --provider virtualbox
# Vagrantfileの初期作成
vagrant init centos/7
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初期作成されたVagrantファイルを以下のように作成します。
sakuraエディタ等を用いて、改行コードはCRLFのファイルとして保存してください。
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# -*- mode: ruby -*-
# vi: set ft=ruby :
Vagrant.configure("2") do |config|
config.vm.box = "centos/7"
# master node
config.vm.define "master" do |machine|
machine.vm.hostname = "master"
# machine.vm.network "forwarded_port", id: "ssh", guest: 22, host: 2222
# machine.vm.network "forwarded_port", guest: 6443, host: 6443, host_ip: "127.0.0.1"
machine.vm.network :private_network, ip: "192.168.33.10", private_network: "intnet"
machine.vm.provider "virtualbox" do |vb|
vb.memory = "2800"
vb.cpus = "2"
vb.customize ["modifyvm", :id, "--natnet1", "172.16.1.0/24"]
end
machine.vm.provision "shell", path: "setupscripts.sh"
end
end
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setupscripts.shファイルを以下のように新規作成します。
sakuraエディタ等を用いて、改行コードはLFのみ、文字コードはUTF-8(BOMなし)のファイルとして作成してください。
PROXY環境下で実行する場合は、setupscripts.shファイルのPROXY_SERV_PORTにプロキシの「サーバ名:ポート番号」を記入してください。
認証付きのPROXY環境下で実行する場合は、setupscripts.shファイルのPROXY_USER、PROXY_PASSにPROXYのユーザー名とパスワードを記入してください。
ダウンロード: setupscripts.sh
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#!/bin/bash
#
# setupscript for kubernetes 1.10 1 node cluster
# see https://www.kaitoy.xyz/2018/04/17/kubernetes110-from-scratch/ Kubernetes 1.10をスクラッチから全手動で構築 | To Be Decided
# 2018.08.21
#
function f_log() {
echo "■" "$@"
}
#
# proxy setting
#
PROXY_SERV_PORT=
PROXY_USER=
PROXY_PASS=
if [ ! -z "$PROXY_USER" ]; then
PROXY_USER_PASS="${PROXY_USER}:${PROXY_PASS}@"
fi
PROXY_SKIP_PROXY="localhost,master,127.0.0.1,192.168.33.10"
# setup proxy , if needed
if [ ! -z "${PROXY_SERV_PORT}" ]; then
f_log "setup proxy"
# edit /etc/profile
cat >> /etc/profile << EOF
PROXY=http://${PROXY_USER_PASS}${PROXY_SERV_PORT}
export http_proxy=$PROXY
export https_proxy=$PROXY
export no_proxy=${PROXY_SKIP_PROXY}
EOF
. /etc/profile
# edit /etc/bashrc
cat >> /etc/bashrc << EOF
PROXY=http://${PROXY_USER_PASS}${PROXY_SERV_PORT}
export http_proxy=$PROXY
export https_proxy=$PROXY
export no_proxy=${PROXY_SKIP_PROXY}
EOF
. /etc/bashrc
# edit /etc/yum.conf
cat >> /etc/yum.conf << EOF
proxy=http://${PROXY_SERV_PORT}
proxy_username=${PROXY_USER}
proxy_password=${PROXY_PASS}
EOF
fi
# 日本語化
f_log "日本語化設定"
sudo yum install -y glibc-common
sudo localedef -f UTF-8 -i ja_JP ja_JP.UTF-8
sudo bash -c "echo 'export LANG=ja_JP.UTF-8' >> /etc/bashrc"
sudo bash -c "echo 'export LANG=ja_JP.UTF-8' >> /etc/profile"
. /etc/bashrc
# kubeletの動作条件にあるので、swapをoffにする
f_log "kubeletの動作条件にあるので、swapをoffにする"
sed -i -e 's/^.*swap.*$//g'/etc/fstab
swapoff -a
# SELinuxを無効にする
f_log "SELinuxを無効にする"
sed -i -e 's/SELINUX=enforcing/SELINUX=disabled/g'/etc/selinux/config
getenforce
setenforce 0
getenforce
# firewallを無効にする
f_log "firewallを無効にする"
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld
# Bridge netfilterモジュールをロードする。
f_log "Bridge netfilterモジュールをロードする。"
modprobe br_netfilter
echo "br_netfilter" > /etc/modules-load.d/br_netfilter.conf
# Bridge netfilterとIP forwardingを有効化する。
f_log "Bridge netfilterとIP forwardingを有効化する。"
cat > /etc/sysctl.d/kubernetes.conf << EOF
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF
sysctl -p /etc/sysctl.d/kubernetes.conf
# 確認
lsmod |grep br_netfilter
sysctl -a | grep -E "net.bridge.bridge-nf-call-|net.ipv4.ip_forward"
ls /proc/sys/net/bridge
### # x509証明書生成
f_log "x509証明書生成"
#### # opensslの設定作成
f_log "openssl設定ファイル作成"
mkdir -p /etc/kubernetes/pki
HOSTNAME=master
K8S_SERVICE_IP=10.0.0.1
MASTER_IP=192.168.33.10
cat > /etc/kubernetes/pki/openssl.cnf << EOF
[ req ]
distinguished_name = req_distinguished_name
[req_distinguished_name]
[ v3_ca ]
basicConstraints = critical, CA:TRUE
keyUsage = critical, digitalSignature, keyEncipherment, keyCertSign
[ v3_req_client ]
basicConstraints = CA:FALSE
keyUsage = critical, digitalSignature, keyEncipherment
extendedKeyUsage = clientAuth
[ v3_req_apiserver ]
basicConstraints = CA:FALSE
keyUsage = critical, digitalSignature, keyEncipherment
extendedKeyUsage = serverAuth
subjectAltName = @alt_names_cluster
[ v3_req_etcd ]
basicConstraints = CA:FALSE
keyUsage = critical, digitalSignature, keyEncipherment
extendedKeyUsage = serverAuth
subjectAltName = @alt_names_etcd
[ alt_names_cluster ]
DNS.1 = kubernetes
DNS.2 = kubernetes.default
DNS.3 = kubernetes.default.svc
DNS.4 = kubernetes.default.svc.cluster.local
DNS.5 = ${HOSTNAME}
IP.1 = ${MASTER_IP}
IP.2 = ${K8S_SERVICE_IP}
[ alt_names_etcd ]
DNS.1 = ${HOSTNAME}
IP.1 = ${MASTER_IP}
EOF
#### # Kubernetes CA証明書生成
f_log "Kubernetes CA証明書生成"
groupadd -r kubernetes
adduser -r -g kubernetes -M -s /sbin/nologin kubernetes
CA_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/ca.key
chown kubernetes:kubernetes /etc/kubernetes/pki/ca.key
chmod 0600 /etc/kubernetes/pki/ca.key
openssl req -x509 -new -sha256 -nodes -key /etc/kubernetes/pki/ca.key -days $CA_DAYS -out /etc/kubernetes/pki/ca.crt -subj "/CN=kubernetes-ca"-extensions v3_ca -config /etc/kubernetes/pki/openssl.cnf
#### # kube-apiserver証明書生成
APISERVER_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/kube-apiserver.key
chown kubernetes:kubernetes /etc/kubernetes/pki/kube-apiserver.key
chmod 0600 /etc/kubernetes/pki/kube-apiserver.key
openssl req -new -sha256 -key /etc/kubernetes/pki/kube-apiserver.key -subj "/CN=kube-apiserver" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/kube-apiserver.crt -days $APISERVER_DAYS -extensions v3_req_apiserver -extfile /etc/kubernetes/pki/openssl.cnf
#### # kube-apiserver-kubelet証明書生成
APISERVER_KUBELET_CLIENT_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/apiserver-kubelet-client.key
chown kubernetes:kubernetes /etc/kubernetes/pki/apiserver-kubelet-client.key
chmod 0600 /etc/kubernetes/pki/apiserver-kubelet-client.key
openssl req -new -key /etc/kubernetes/pki/apiserver-kubelet-client.key -subj "/CN=kube-apiserver-kubelet-client/O=system:masters" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/apiserver-kubelet-client.crt -days $APISERVER_KUBELET_CLIENT_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # adminクライアント証明書生成
groupadd -r kube-admin
adduser -r -g kube-admin -M -s /sbin/nologin kube-admin
ADMIN_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/admin.key
chown kube-admin:kube-admin /etc/kubernetes/pki/admin.key
chmod 0600 /etc/kubernetes/pki/admin.key
openssl req -new -key /etc/kubernetes/pki/admin.key -subj "/CN=kubernetes-admin/O=system:masters" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/admin.crt -days $ADMIN_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # kube-controller-managerのクライアント証明書生成
CONTROLLER_MANAGER_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/kube-controller-manager.key
openssl ec -in /etc/kubernetes/pki/kube-controller-manager.key -outform PEM -pubout -out /etc/kubernetes/pki/kube-controller-manager.pub
chown kubernetes:kubernetes /etc/kubernetes/pki/kube-controller-manager.key
chmod 0600 /etc/kubernetes/pki/kube-controller-manager.key
openssl req -new -sha256 -key /etc/kubernetes/pki/kube-controller-manager.key -subj "/CN=system:kube-controller-manager" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/kube-controller-manager.crt -days $CONTROLLER_MANAGER_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # kube-schedulerクライアント証明書生成
SCHEDULER_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/kube-scheduler.key
chown kubernetes:kubernetes /etc/kubernetes/pki/kube-scheduler.key
chmod 0600 /etc/kubernetes/pki/kube-scheduler.key
openssl req -new -sha256 -key /etc/kubernetes/pki/kube-scheduler.key -subj "/CN=system:kube-scheduler" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/kube-scheduler.crt -days $SCHEDULER_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # kube-proxyクライアント証明書生成
PROXY_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/kube-proxy.key
chown kubernetes:kubernetes /etc/kubernetes/pki/kube-proxy.key
chmod 0600 /etc/kubernetes/pki/kube-proxy.key
openssl req -new -sha256 -key /etc/kubernetes/pki/kube-proxy.key -subj "/CN=system:kube-proxy" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out /etc/kubernetes/pki/kube-proxy.crt -days $PROXY_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # front proxy CA証明書生成
FRONT_PROXY_CA_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/front-proxy-ca.key
chown kubernetes:kubernetes /etc/kubernetes/pki/front-proxy-ca.key
chmod 0600 /etc/kubernetes/pki/front-proxy-ca.key
openssl req -x509 -new -sha256 -nodes -key /etc/kubernetes/pki/front-proxy-ca.key -days $FRONT_PROXY_CA_DAYS -out /etc/kubernetes/pki/front-proxy-ca.crt -subj "/CN=front-proxy-ca" -extensions v3_ca -config /etc/kubernetes/pki/openssl.cnf
#### # front proxyクライアント証明書
FRONT_PROXY_CLIENT_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/front-proxy-client.key
chown kubernetes:kubernetes /etc/kubernetes/pki/front-proxy-client.key
chmod 0600 /etc/kubernetes/pki/front-proxy-client.key
openssl req -new -sha256 -key /etc/kubernetes/pki/front-proxy-client.key -subj "/CN=front-proxy-client" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/front-proxy-ca.crt -CAkey /etc/kubernetes/pki/front-proxy-ca.key -CAcreateserial -out /etc/kubernetes/pki/front-proxy-client.crt -days $FRONT_PROXY_CLIENT_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # etcd CA証明書
groupadd -r etcd
adduser -r -g etcd -M -s /sbin/nologin etcd
ETCD_CA_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/etcd-ca.key
chown etcd:etcd /etc/kubernetes/pki/etcd-ca.key
chmod 0600 /etc/kubernetes/pki/etcd-ca.key
openssl req -x509 -new -sha256 -nodes -key /etc/kubernetes/pki/etcd-ca.key -days $ETCD_CA_DAYS -out /etc/kubernetes/pki/etcd-ca.crt -subj "/CN=etcd-ca" -extensions v3_ca -config /etc/kubernetes/pki/openssl.cnf
#### # etcd証明書
ETCD_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/etcd.key
chown etcd:etcd /etc/kubernetes/pki/etcd.key
chmod 0600 /etc/kubernetes/pki/etcd.key
openssl req -new -sha256 -key /etc/kubernetes/pki/etcd.key -subj "/CN=etcd" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/etcd-ca.crt -CAkey /etc/kubernetes/pki/etcd-ca.key -CAcreateserial -out /etc/kubernetes/pki/etcd.crt -days $ETCD_DAYS -extensions v3_req_etcd -extfile /etc/kubernetes/pki/openssl.cnf
#### # etcdクライアント証明書
ETCD_CLIENT_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/etcd-client.key
chown kubernetes:kubernetes /etc/kubernetes/pki/etcd-client.key
chmod 0600 /etc/kubernetes/pki/etcd-client.key
openssl req -new -sha256 -key /etc/kubernetes/pki/etcd-client.key -subj "/CN=kube-apiserver" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/etcd-ca.crt -CAkey /etc/kubernetes/pki/etcd-ca.key -CAcreateserial -out /etc/kubernetes/pki/etcd-client.crt -days $ETCD_CLIENT_DAYS -extensions v3_req_client -extfile /etc/kubernetes/pki/openssl.cnf
#### # etcd peer証明書
ETCD_PEER_DAYS=5475
openssl ecparam -name secp521r1 -genkey -noout -out /etc/kubernetes/pki/etcd-peer.key
chown etcd:etcd /etc/kubernetes/pki/etcd-peer.key
chmod 0600 /etc/kubernetes/pki/etcd-peer.key
openssl req -new -sha256 -key /etc/kubernetes/pki/etcd-peer.key -subj "/CN=etcd-peer" | openssl x509 -req -sha256 -CA /etc/kubernetes/pki/etcd-ca.crt -CAkey /etc/kubernetes/pki/etcd-ca.key -CAcreateserial -out /etc/kubernetes/pki/etcd-peer.crt -days $ETCD_PEER_DAYS -extensions v3_req_etcd -extfile /etc/kubernetes/pki/openssl.cnf
#### # 証明書の確認
for i in /etc/kubernetes/pki/*crt; do
echo $i:;
openssl x509 -subject -issuer -noout -in $i;
echo;
done
### # Kubernetesバイナリインストール
if [ -r /vagrant/kubernetes-server-linux-amd64.tar.gz ]; then
/bin/cp /vagrant/kubernetes-server-linux-amd64.tar.gz .
else
curl -L -O https://dl.k8s.io/v1.10.6/kubernetes-server-linux-amd64.tar.gz
fi
tar xvzf kubernetes-server-linux-amd64.tar.gz kubernetes/server/bin/hyperkube
mv kubernetes/server/bin/hyperkube/usr/bin
chmod +x /usr/bin/hyperkube
ln -s /usr/bin/hyperkube /usr/bin/kube-apiserver
ln -s /usr/bin/hyperkube /usr/bin/kube-controller-manager
ln -s /usr/bin/hyperkube /usr/bin/kube-scheduler
ln -s /usr/bin/hyperkube /usr/bin/kube-proxy
ln -s /usr/bin/hyperkube /usr/bin/kubelet
ln -s /usr/bin/hyperkube /usr/bin/kubectl
mkdir -p /var/lib/{kubelet,kube-proxy}
### # 接続するためのkubeconfigファイルを生成する
#### # kube-controller-managerのkubeconfig
MASTER_IP=192.168.33.10
KUBERNETES_PUBLIC_ADDRESS=$MASTER_IP
CLUSTER_NAME="k8s"
KCONFIG=/etc/kubernetes/kube-controller-manager.kubeconfig
KUSER="system:kube-controller-manager"
kubectl config set-cluster ${CLUSTER_NAME} --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 --kubeconfig=${KCONFIG}
kubectl config set-credentials ${KUSER} --client-certificate=/etc/kubernetes/pki/kube-controller-manager.crt --client-key=/etc/kubernetes/pki/kube-controller-manager.key --embed-certs=true --kubeconfig=${KCONFIG}
kubectl config set-context ${KUSER}@${CLUSTER_NAME} --cluster=${CLUSTER_NAME} --user=${KUSER} --kubeconfig=${KCONFIG}
kubectl config use-context ${KUSER}@${CLUSTER_NAME} --kubeconfig=${KCONFIG}
chown kubernetes:kubernetes ${KCONFIG}
chmod 0600 ${KCONFIG}
kubectl config view --kubeconfig=${KCONFIG}
#### # kube-schedulerのkubeconfig
MASTER_IP=192.168.33.10
KUBERNETES_PUBLIC_ADDRESS=$MASTER_IP
CLUSTER_NAME="k8s"
KCONFIG=/etc/kubernetes/kube-scheduler.kubeconfig
KUSER="system:kube-scheduler"
kubectl config set-cluster ${CLUSTER_NAME} --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 --kubeconfig=${KCONFIG}
kubectl config set-credentials ${KUSER} --client-certificate=/etc/kubernetes/pki/kube-scheduler.crt --client-key=/etc/kubernetes/pki/kube-scheduler.key --embed-certs=true --kubeconfig=${KCONFIG}
kubectl config set-context ${KUSER}@${CLUSTER_NAME} --cluster=${CLUSTER_NAME} --user=${KUSER} --kubeconfig=${KCONFIG}
kubectl config use-context ${KUSER}@${CLUSTER_NAME} --kubeconfig=${KCONFIG}
chown kubernetes:kubernetes ${KCONFIG}
chmod 0600 ${KCONFIG}
kubectl config view --kubeconfig=${KCONFIG}
#### # adminのkubeconfig(ユーザーが使うkubectlコマンド用)
MASTER_IP=192.168.33.10
KUBERNETES_PUBLIC_ADDRESS=$MASTER_IP
CLUSTER_NAME="k8s"
KCONFIG=/etc/kubernetes/admin.kubeconfig
KUSER="kubernetes-admin"
kubectl config set-cluster ${CLUSTER_NAME} --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 --kubeconfig=${KCONFIG}
kubectl config set-credentials ${KUSER} --client-certificate=/etc/kubernetes/pki/admin.crt --client-key=/etc/kubernetes/pki/admin.key --embed-certs=true --kubeconfig=${KCONFIG}
kubectl config set-context ${KUSER}@${CLUSTER_NAME} --cluster=${CLUSTER_NAME} --user=${KUSER} --kubeconfig=${KCONFIG}
kubectl config use-context ${KUSER}@${CLUSTER_NAME} --kubeconfig=${KCONFIG}
chown kube-admin:kube-admin ${KCONFIG}
chmod 0600 ${KCONFIG}
ln -s ${KCONFIG} ~/.kube/config
kubectl config view --kubeconfig=${KCONFIG}
### # etcd デプロイ
if [ -r /vagrant/etcd-v3.1.12-linux-amd64.tar.gz ]; then
/bin/cp /vagrant/etcd-v3.1.12-linux-amd64.tar.gz .
else
curl -L -O https://github.com/coreos/etcd/releases/download/v3.1.12/etcd-v3.1.12-linux-amd64.tar.gz
fi
tar xvzf etcd-v3.1.12-linux-amd64.tar.gzetcd-v3.1.12-linux-amd64/etcdetcd-v3.1.12-linux-amd64/etcdctl
mv etcd-v3.1.12-linux-amd64/etcd/usr/bin
mv etcd-v3.1.12-linux-amd64/etcdctl/usr/bin
chown root:root /usr/bin/etcd*
chmod 0755 /usr/bin/etcd*
mkdir -p /var/lib/etcd
chown etcd:etcd /var/lib/etcd
MASTER_IP=192.168.33.10
ETCD_MEMBER_NAME=etcd1
CLUSTER_NAME="k8s"
ETCD_TOKEN=$(openssl rand -hex 5)
ETCD_CLUSTER_TOKEN=$CLUSTER_NAME-$ETCD_TOKEN
cat > /etc/systemd/system/etcd.service << EOF
[Unit]
Description=etcd
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
NotifyAccess=all
User=etcd
Group=etcd
ExecStart=/usr/bin/etcd \\
--name ${ETCD_MEMBER_NAME} \\
--listen-client-urls https://${MASTER_IP}:2379 \\
--advertise-client-urls https://${MASTER_IP}:2379 \\
--data-dir=/var/lib/etcd \\
--cert-file=/etc/kubernetes/pki/etcd.crt \\
--key-file=/etc/kubernetes/pki/etcd.key \\
--peer-cert-file=/etc/kubernetes/pki/etcd-peer.crt \\
--peer-key-file=/etc/kubernetes/pki/etcd-peer.key \\
--trusted-ca-file=/etc/kubernetes/pki/etcd-ca.crt \\
--peer-trusted-ca-file=/etc/kubernetes/pki/etcd-ca.crt \\
--peer-client-cert-auth \\
--client-cert-auth \\
--initial-advertise-peer-urls https://${MASTER_IP}:2380 \\
--listen-peer-urls https://${MASTER_IP}:2380 \\
--initial-cluster-token ${ETCD_CLUSTER_TOKEN} \\
--initial-cluster ${ETCD_MEMBER_NAME}=https://${MASTER_IP}:2380 \\
--initial-cluster-state new
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd -l
MASTER_IP=192.168.33.10
# API version 2
unset ETCDCTL_API
etcdctl --version
# API version 3
env ETCDCTL_API=3 etcdctl version
env ETCDCTL_API=3 etcdctl --endpoints ${MASTER_IP}:2379 --cacert=/etc/kubernetes/pki/etcd-ca.crt --cert=/etc/kubernetes/pki/etcd-client.crt --key=/etc/kubernetes/pki/etcd-client.key member list
env ETCDCTL_API=3 etcdctl --endpoints ${MASTER_IP}:2379 --cacert=/etc/kubernetes/pki/etcd-ca.crt --cert=/etc/kubernetes/pki/etcd-client.crt --key=/etc/kubernetes/pki/etcd-client.key endpoint health
### # マスターノードのコンポーネントデプロイ
#### # kube-apiserver
f_log kube-apiserver
mkdir -p /var/log/kubernetes
chown kubernetes:kubernetes /var/log/kubernetes
chmod 0700 /var/log/kubernetes
MASTER_IP=192.168.33.10
SERVICE_CLUSTER_IP_RANGE="10.0.0.0/16"
SECRET_ENC_KEY=$(echo -n 'your_32_bytes_secure_private_key' | base64)
cat > /etc/kubernetes/encryption.conf << EOF
kind: EncryptionConfig
apiVersion: v1
resources:
- resources:
- secrets
providers:
- aescbc:
keys:
- name: key1
secret: ${SECRET_ENC_KEY}
- identity: {}
EOF
cat > /etc/kubernetes/audit-policy.conf << EOF
apiVersion: audit.k8s.io/v1beta1
kind: Policy
# Don't generate audit events for all requests in RequestReceived stage.
omitStages:
- "RequestReceived"
rules:
# Log pod changes at RequestResponse level
- level: RequestResponse
resources:
- group: ""
# Resource "pods" doesn't match requests to any subresource of pods,
# which is consistent with the RBAC policy.
resources: ["pods"]
# Log "pods/log", "pods/status" at Metadata level
- level: Metadata
resources:
- group: ""
resources: ["pods/log", "pods/status"]
# Don't log requests to a configmap called "controller-leader"
- level: None
resources:
- group: ""
resources: ["configmaps"]
resourceNames: ["controller-leader"]
# Don't log watch requests by the "system:kube-proxy" on endpoints or services
- level: None
users: ["system:kube-proxy"]
verbs: ["watch"]
resources:
- group: "" # core API group
resources: ["endpoints", "services"]
# Don't log authenticated requests to certain non-resource URL paths.
- level: None
userGroups: ["system:authenticated"]
nonResourceURLs:
- "/api*" # Wildcard matching.
- "/version"
# Log the request body of configmap changes in kube-system.
- level: Request
resources:
- group: "" # core API group
resources: ["configmaps"]
# This rule only applies to resources in the "kube-system" namespace.
# The empty string "" can be used to select non-namespaced resources.
namespaces: ["kube-system"]
# Log configmap and secret changes in all other namespaces at the Metadata level.
- level: Metadata
resources:
- group: "" # core API group
resources: ["secrets", "configmaps"]
# Log all other resources in core and extensions at the Request level.
- level: Request
resources:
- group: "" # core API group
- group: "extensions" # Version of group should NOT be included.
# A catch-all rule to log all other requests at the Metadata level.
- level: Metadata
# Long-running requests like watches that fall under this rule will not
# generate an audit event in RequestReceived.
omitStages:
- "RequestReceived"
EOF
cat > /etc/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
User=kubernetes
Group=kubernetes
ExecStart=/usr/bin/kube-apiserver \\
--feature-gates=RotateKubeletServerCertificate=true \\
--apiserver-count=1 \\
--allow-privileged=true \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota,NodeRestriction,DenyEscalatingExec,StorageObjectInUseProtection \\
--authorization-mode=Node,RBAC \\
--bind-address=0.0.0.0 \\
--advertise-address=${MASTER_IP} \\
--client-ca-file=/etc/kubernetes/pki/ca.crt \\
--etcd-cafile=/etc/kubernetes/pki/etcd-ca.crt \\
--etcd-certfile=/etc/kubernetes/pki/etcd-client.crt \\
--etcd-keyfile=/etc/kubernetes/pki/etcd-client.key \\
--etcd-servers=https://${MASTER_IP}:2379 \\
--service-account-key-file=/etc/kubernetes/pki/kube-controller-manager.pub \\
--service-cluster-ip-range=${SERVICE_CLUSTER_IP_RANGE} \\
--tls-cert-file=/etc/kubernetes/pki/kube-apiserver.crt \\
--tls-private-key-file=/etc/kubernetes/pki/kube-apiserver.key \\
--kubelet-certificate-authority=/etc/kubernetes/pki/ca.crt \\
--enable-bootstrap-token-auth=true \\
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt \\
--kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key \\
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \\
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt \\
--requestheader-username-headers=X-Remote-User \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-allowed-names=front-proxy-client \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt \\
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key \\
--experimental-encryption-provider-config=/etc/kubernetes/encryption.conf \\
--v=2 \\
--tls-min-version=VersionTLS12 \\
--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 \\
--anonymous-auth=false \\
--audit-log-format=json \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/var/log/kubernetes/kube-audit.log \\
--audit-policy-file=/etc/kubernetes/audit-policy.conf
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl start kube-apiserver
systemctl status kube-apiserver -l
journalctl -u kube-apiserver
kubectl cluster-info
kubectl cluster-info dump
#### # kube-controller-manager
f_log kube-controller-manager
CLUSTER_CIDR="10.244.0.0/16"
SERVICE_CLUSTER_IP_RANGE="10.0.0.0/16"
CLUSTER_NAME="k8s"
cat > /etc/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
User=kubernetes
Group=kubernetes
ExecStart=/usr/bin/kube-controller-manager \\
--feature-gates=RotateKubeletServerCertificate=true \\
--kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \\
--bind-address=0.0.0.0 \\
--controllers=*,bootstrapsigner,tokencleaner \\
--service-account-private-key-file=/etc/kubernetes/pki/kube-controller-manager.key \\
--allocate-node-cidrs=true \\
--cluster-cidr=${CLUSTER_CIDR} \\
--node-cidr-mask-size=24 \\
--cluster-name=${CLUSTER_NAME} \\
--service-cluster-ip-range=${SERVICE_CLUSTER_IP_RANGE} \\
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.crt \\
--cluster-signing-key-file=/etc/kubernetes/pki/ca.key \\
--root-ca-file=/etc/kubernetes/pki/ca.crt \\
--use-service-account-credentials=true \\
--v=2 \\
--experimental-cluster-signing-duration=8760h0m0s
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl start kube-controller-manager
systemctl status kube-controller-manager -l
kubectl cluster-info
kubectl cluster-info dump
#### # kube-scheduler
f_log kube-scheduler
cat > /etc/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
User=kubernetes
Group=kubernetes
ExecStart=/usr/bin/kube-scheduler \\
--feature-gates=RotateKubeletServerCertificate=true \\
--kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \\
--address=0.0.0.0 \\
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl start kube-scheduler
systemctl status kube-scheduler -l
kubectl cluster-info
kubectl cluster-info dump
#### # マスタコンポーネント状態確認
f_log "マスタコンポーネント状態確認"
kubectl version
kubectl get componentstatuses
### TLS Bootstrapping の設定
f_log "TLS Bootstrapping の設定"
#### # Bootstrap TokenのSecret生成
TOKEN_PUB=$(openssl rand -hex 3)
TOKEN_SECRET=$(openssl rand -hex 8)
BOOTSTRAP_TOKEN="${TOKEN_PUB}.${TOKEN_SECRET}"
kubectl -n kube-system create secret generic bootstrap-token-${TOKEN_PUB} --type 'bootstrap.kubernetes.io/token' --from-literal description="cluster bootstrap token" --from-literal token-id=${TOKEN_PUB} --from-literal token-secret=${TOKEN_SECRET} --from-literal usage-bootstrap-authentication=true --from-literal usage-bootstrap-signing=true --from-literal auth-extra-groups=system:bootstrappers:worker,system:bootstrappers:ingress
TOKEN_PUB=$(echo $BOOTSTRAP_TOKEN | sed -e s/\\..*//)
kubectl -n kube-system get secret/bootstrap-token-${TOKEN_PUB} -o yaml
#### # Bootstrap kubeconfig作成
mkdir -p /etc/kubernetes/manifests
MASTER_IP=192.168.33.10
KUBERNETES_PUBLIC_ADDRESS=$MASTER_IP
CLUSTER_NAME="k8s"
KCONFIG="/etc/kubernetes/bootstrap.kubeconfig"
KUSER="kubelet-bootstrap"
kubectl config set-cluster ${CLUSTER_NAME} --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 --kubeconfig=${KCONFIG}
kubectl config set-context ${KUSER}@${CLUSTER_NAME} --cluster=${CLUSTER_NAME} --user=${KUSER} --kubeconfig=${KCONFIG}
kubectl config use-context ${KUSER}@${CLUSTER_NAME} --kubeconfig=${KCONFIG}
chown kubernetes:kubernetes ${KCONFIG}
chmod 0600 ${KCONFIG}
kubectl config view --kubeconfig=${KCONFIG}
#### # CA証明書とbootstrap kubeconfigをConfigMap(cluster-info)で公開
# kubeletはこのConfigMapを見てクラスタに参加する。
kubectl -n kube-public create configmap cluster-info --from-file /etc/kubernetes/pki/ca.crt --from-file /etc/kubernetes/bootstrap.kubeconfig
# anonymousユーザにcluster-infoへのアクセスを許可する。
kubectl -n kube-public create role system:bootstrap-signer-clusterinfo --verb get --resource configmaps
kubectl -n kube-public create rolebinding kubeadm:bootstrap-signer-clusterinfo --role system:bootstrap-signer-clusterinfo --user system:anonymous
# system:bootstrappersグループにsystem:node-bootstrapperロールを紐づける。
kubectl create clusterrolebinding kubeadm:kubelet-bootstrap --clusterrole system:node-bootstrapper --group system:bootstrappers
#### # bootstrap.kubeconfigにトークンを追記
kubectl config set-credentials kubelet-bootstrap --token=${BOOTSTRAP_TOKEN} --kubeconfig=/etc/kubernetes/bootstrap.kubeconfig
### # yum update
f_log "yum udpate"
yum -y update
### # Docker インストール
f_log "Docker インストール"
yum install -y yum-utils
# devicemapper storage driverを使う場合は、以下が必要
yum install -y device-mapper-persistent-datalvm2
# リポジトリに追加
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# 昔のバージョンも表示する
yum list docker-ce --showduplicates | sort -r
# 18.03を明示的に指定してインストール
yum install -y docker-ce-18.03.1.ce-1.el7.centos
# docker-ce rpmのsystemd設定ファイル位置を確認 ( /usr/lib/systemd/system/docker.service のはず )
rpm -ql docker-ce | grep docker.service
# docker service systemdファイルの編集
cat > /usr/lib/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP \$MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
EOF
# PROXY設定があるなら追加
if [ ! -z "$PROXY_SERV_PORT" ]; then
f_log "PROXY設定追加 /usr/lib/systemd/system/docker.service"
awk '{ if ( index($0, "[Service]") == 1 ) { print $0 ; print "Environment=\"http_proxy=http://${PROXY_USER_PASS}${PROXY_SERV_PORT}\" \"https_proxy=http://${PROXY_USER_PASS}${PROXY_SERV_PORT}\" \"no_proxy=${PROXY_SKIP_PROXY}\"" } else { print $0 } }' < /usr/lib/systemd/system/docker.service> /usr/lib/systemd/system/docker.service.new
/bin/mv /usr/lib/systemd/system/docker.service.new /usr/lib/systemd/system/docker.service
fi
systemctl daemon-reload
systemctl show docker --property Environment
systemctl enable docker
systemctl start docker
cat /proc/$(pidof dockerd)/environ
systemctl status docker -l
docker version
kubectl version
docker run hello-world
### # CNI インストール
f_log "CNI インストール"
mkdir -p /etc/cni/net.d /opt/cni/bin/
cd /tmp
if [ -r /vagrant/cni-amd64-v0.6.0.tgz ]; then
cp /vagrant/cni-amd64-v0.6.0.tgz .
else
curl -OL https://github.com/containernetworking/cni/releases/download/v0.6.0/cni-amd64-v0.6.0.tgz
fi
if [ -r /vagrant/cni-plugins-amd64-v0.7.1.tgz ]; then
cp /vagrant/cni-plugins-amd64-v0.7.1.tgz .
else
curl -OL https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz
fi
cd /opt/cni/bin
tar zxf /tmp/cni-amd64-v0.6.0.tgz
tar zxf /tmp/cni-plugins-amd64-v0.7.1.tgz
chmod +x /opt/cni/bin/*
cat >/etc/cni/net.d/99-loopback.conf <<EOF
{
"type": "loopback"
}
EOF
### # Node CSR 自動承認
f_log "Node CSR 自動承認"
cat <<EOF | kubectl create -f -
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: auto-approve-csrs-for-group
subjects:
- kind: Group
name: system:bootstrappers
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
apiGroup: rbac.authorization.k8s.io
EOF
HOSTNAME=master
cat <<EOF | kubectl create -f -
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ${HOSTNAME}-node-client-cert-renewal
subjects:
- kind: User
name: system:node:${HOSTNAME}
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
apiGroup: rbac.authorization.k8s.io
EOF
cat <<EOF | kubectl create -f -
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: approve-node-server-renewal-csr
rules:
- apiGroups: ["certificates.k8s.io"]
resources: ["certificatesigningrequests/selfnodeserver"]
verbs: ["create"]
EOF
HOSTNAME=master
cat <<EOF | kubectl create -f -
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ${HOSTNAME}-server-client-cert-renewal
subjects:
- kind: User
name: system:node:${HOSTNAME}
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: approve-node-server-renewal-csr
apiGroup: rbac.authorization.k8s.io
EOF
### # kubelet インストール
f_log "kubelet インストール"
yum -y install conntrack-tools
DNS_SERVER_IP=10.0.0.10
PAUSE_IMAGE=k8s.gcr.io/pause-amd64:3.1
DNS_DOMAIN="cluster.local"
cat > /etc/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
User=root
Group=root
ExecStart=/usr/bin/kubelet \\
--feature-gates=RotateKubeletServerCertificate=true \\
--address=0.0.0.0 \\
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \\
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
--pod-manifest-path=/etc/kubernetes/manifests \\
--network-plugin=cni \\
--cni-conf-dir=/etc/cni/net.d \\
--cni-bin-dir=/opt/cni/bin \\
--cluster-dns=${DNS_SERVER_IP} \\
--cluster-domain=${DNS_DOMAIN} \\
--authorization-mode=Webhook \\
--client-ca-file=/etc/kubernetes/pki/ca.crt \\
--cert-dir=/etc/kubernetes/pki \\
--rotate-certificates=true \\
--v=2 \\
--cgroup-driver=cgroupfs \\
--pod-infra-container-image=${PAUSE_IMAGE} \\
--tls-min-version=VersionTLS12 \\
--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 \\
--allow-privileged=true \\
--anonymous-auth=false
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kubelet
systemctl start kubelet
systemctl status kubelet -l
kubectl get node
### # kube-proxy
f_log "kube-proxy "
MASTER_IP=192.168.33.10
KUBERNETES_PUBLIC_ADDRESS=$MASTER_IP
CLUSTER_NAME="k8s"
KCONFIG="/etc/kubernetes/kube-proxy.kubeconfig"
KUSER="system:kube-proxy"
kubectl config set-cluster ${CLUSTER_NAME} --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 --kubeconfig=${KCONFIG}
kubectl config set-credentials ${KUSER} --client-certificate=/etc/kubernetes/pki/kube-proxy.crt --client-key=/etc/kubernetes/pki/kube-proxy.key --embed-certs=true --kubeconfig=${KCONFIG}
kubectl config set-context ${KUSER}@${CLUSTER_NAME} --cluster=${CLUSTER_NAME} --user=${KUSER} --kubeconfig=${KCONFIG}
kubectl config use-context ${KUSER}@${CLUSTER_NAME} --kubeconfig=${KCONFIG}
chown kubernetes:kubernetes ${KCONFIG}
chmod 0600 ${KCONFIG}
kubectl config view --kubeconfig=${KCONFIG}
# Service Accountのkube-proxyにsystem:node-proxierというClusterRoleを付ける。
kubectl create clusterrolebinding kubeadm:node-proxier --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
CLUSTER_CIDR="10.244.0.0/16"
cat > /etc/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
User=root
Group=root
ExecStart=/usr/bin/kube-proxy \\
--feature-gates=RotateKubeletServerCertificate=true \\
--bind-address 0.0.0.0 \\
--cluster-cidr=${CLUSTER_CIDR} \\
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig \\
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-proxy
systemctl start kube-proxy
systemctl status kube-proxy -l
### # ネットワークプロバイダ (flannel)
f_log "ネットワークプロバイダ (flannel)"
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl -n kube-system get po
### # CoreDNS
f_log "CoreDNS"
f_log "Kubernetes 1.10からは、サービスディスカバリに(kube-dnsの代わりに)CoreDNSを使うのが標準になった。"
f_log "jqコマンドのインストール"
yum -y install epel-release
yum -y install jq
cd /tmp
curl -LO https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/coredns.yaml.sed
curl -LO https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/deploy.sh
chmod +x deploy.sh
DNS_SERVER_IP="10.0.0.10"
SERVICE_CLUSTER_IP_RANGE="10.0.0.0/16"
DNS_DOMAIN="cluster.local"
./deploy.sh -r $SERVICE_CLUSTER_IP_RANGE -i $DNS_SERVER_IP -d $DNS_DOMAIN > coredns.yaml
kubectl apply -f coredns.yaml
kubectl -n kube-system get svc,pod
f_log "setup completed"
|
セットアップ実行
以下のコマンドでvagrantを起動します。セットアップスクリプトが自動実行されます。
大量にダウンロードするので、しばらく待ちます…。
|
1
|
vagrant up--provider=virtualbox
|
以下のような表示になれば、セットアップは完了です。
|
1
|
master: ■ setup completed
|
それではちょっと使ってみましょう。
一般ユーザー権限のPowerShellから操作します。
|
1
2
|
# Power Shell の文字コードをUTF-8に変更します。
chcp 65001
|
vagrantマシンにsshで入ります。
|
1
|
vagrant ssh
|
vagrantの場合、最初はvagrantというユーザー名でログインすることになります。
kubernetesやdockerは、rootになって操作します。
|
1
|
sudo bash
|
以下のコマンドを入力し、kubernetesのシステムが動作しているか確認します。
|
1
|
kubectl -n kube-system get svc,pod
|
表示結果は以下のようになります。
|
1
2
3
4
5
6
7
8
9
|
[root@master vagrant]# kubectl -n kube-system get svc,pod
NAME TYPECLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kube-dns ClusterIP 10.0.0.1053/UDP,53/TCP 1m
NAMEREADY STATUSRESTARTS AGE
pod/coredns-794b5f8589-tj6hl1/1 Running 01m
pod/coredns-794b5f8589-vqr4x1/1 Running 01m
pod/kube-flannel-ds-amd64-mp8vc 1/1 Running 022m
[root@master vagrant]#
|
以上です。