Kubernetes
参考
https://www.server-world.info/query?os=Ubuntu_20.04&p=kubernetes&f=2
https://kubernetes.io/ja/docs/setup/production-environment/tools/kubeadm/_print/
前提
- MasterノードはCPUが2つ以上必要
- swapはOFFにする
- Credentialは/etc/kubernetes/admin.confがあるので、クライアントから実行するときはこれをコピる
全ノード
dockerインストール
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apt -y install docker.io apt-transport-https vim |
systemdを使うようにする
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cat > /etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF |
docker起動
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systemctl restart docker systemctl enable docker |
iptables-lagacyにする
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root@master:~# update-alternatives --config iptables There are 2 choices for the alternative iptables (providing /usr/sbin/iptables). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/sbin/iptables-nft 20 auto mode * 1 /usr/sbin/iptables-legacy 10 manual mode 2 /usr/sbin/iptables-nft 20 manual mode |
SwapをOFFにする
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swapoff -a root@master:~# cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/ubuntu-vg/ubuntu-lv during curtin installation /dev/disk/by-id/dm-uuid-LVM-gIgYoX5IsD2ZOigjA3swD2HATXd1QiDsIomOmkPDjSm5tC6f27ERL27m5rCtNPc9 / ext4 defaults 0 1 # /boot was on /dev/sda2 during curtin installation /dev/disk/by-uuid/a5ee61f4-178d-470f-9b23-cc7461595e0b /boot ext4 defaults 0 1 # /boot/efi was on /dev/sda1 during curtin installation /dev/disk/by-uuid/D8DE-26AC /boot/efi vfat defaults 0 1 #/swap.img none swap sw 0 0 |
ツールインストール
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curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list apt update apt -y install kubeadm kubelet kubectl |
Master
- –apiserver-advertise-address=192.168.11.171はNICが2つ以上あるときは必須
- NICが1つなら指定しなくてもOK
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kubeadm init --apiserver-advertise-address=192.168.11.171 --pod-network-cidr=10.244.0.0/16 |
初期化
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Your Kubernetes control-plane has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config Alternatively, if you are the root user, you can run: export KUBECONFIG=/etc/kubernetes/admin.conf You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ Then you can join any number of worker nodes by running the following on each as root: kubeadm join 192.168.11.171:6443 --token yg4y0v.uipod29qg9b7czia \ --discovery-token-ca-cert-hash sha256:8f17f3377c4f983d3a61a1b9f094831ea1eb1a7028cd95c1209cc299a94f88be |
Node側で実行するので控えておく
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kubeadm join 192.168.11.171:6443 --token yg4y0v.uipod29qg9b7czia \ --discovery-token-ca-cert-hash sha256:8f17f3377c4f983d3a61a1b9f094831ea1eb1a7028cd95c1209cc299a94f88be |
資格情報をセット
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mkdir -p $HOME/.kube cp -i /etc/kubernetes/admin.conf $HOME/.kube/config chown $(id -u):$(id -g) $HOME/.kube/config |
Falnnelをインストールしてネットワークを構築する
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kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl get nodes kubectl get pods -A |
Node
クラスタに参加
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kubeadm join 192.168.11.171:6443 --token yg4y0v.uipod29qg9b7czia \ --discovery-token-ca-cert-hash sha256:8f17f3377c4f983d3a61a1b9f094831ea1eb1a7028cd95c1209cc299a94f88be |
Client
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scp -p administrator@192.168.11.171:~/config .kube/config |