Kubernetes. Установка 3 мастера 2 воркера 1 баллансировщик

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Общая схема:

имеются следующие сервера:
3 сервера для master nodes, 2 для worker nodes и 1 для load balancer:

192.168.1.120 kub-lb-120
192.168.1.121 kub-master-121
192.168.1.122 kub-master-122
192.168.1.123 kub-master-123
192.168.1.124 kub-work-124
192.168.1.124 kub-work-125

Балансировщик нагрузки NGINX

Будем использовать NGINX в качестве TCP балансировщика.

Добавляем репозиторий:

yum install -y epel-release

Устанавливаем nginx:

yum install -y nginx

Добавляем в самый них nginx.conf /etc/nginx/nginx.conf
на:

[codesyntax lang="php"]

stream {
upstream stream_backend {
    least_conn;
    server 192.168.1.121:6443;
    server 192.168.1.122:6443;
    server 192.168.1.123:6443;
    }

server {
    listen 6443;
    proxy_pass stream_backend;
  }
}

stream {

upstream stream_backend {

least_conn;

server 192.168.1.121:6443;

server 192.168.1.122:6443;

server 192.168.1.123:6443;

}

server {

listen 6443;

proxy_pass stream_backend;

}

[/codesyntax]

Рестартуем nginx сервер:

systemctl start nginx

добавляем в автозапуск:
systemctl enable nginx

Kubernetes

Подготавливаем Kubernetes сервера на базе centos 7. (на всех нодах кроме балансировщика)

Добавляем docker репозиторий:

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Устанавливаем docker:

yum install -y yum-utils device-mapper-persistent-data lvm2

yum install -y docker-ce docker-ce-cli containerd.io

Запускаем docker службу и ставим ее в автозагрузку:

systemctl enable docker

systemctl start docker

Создаем конфигурационный файл для docker:

vim /etc/docker/daemon.json

[codesyntax lang="php"]

{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ],
  "experimental":true
}

{

"exec-opts": ["native.cgroupdriver=systemd"],

"storage-driver": "overlay2",

"storage-opts": [

"overlay2.override_kernel_check=true"

"experimental":true

}

[/codesyntax]

Рестартуем docker для применения новой конфигурации:

systemctl restart docker

Добавляем kubernetes репозиторий:

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

Устанавливаем kubernetes пакеты:

yum install -y kubelet kubeadm kubectl

Добавляем kubelet в автозапуск и стартуем его:

systemctl enable kubelet

systemctl start kubelet

Добавляем параметры в systctl:

cat <<EOF > /etc/sysctl.d/k8s.conf

net.ipv4.ip_forward = 1

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

EOF

Применяем:

sysctl --system

Отсключаем swap:
swapoff -a

а также коментим его в /etc/fstab

Мастер ноды:

Создаем директорию kubeadm:

mkdir /etc/kubernetes/kubeadm

В этой директории создаем конфигурационный файл для инициализации кластера:

vim /etc/kubernetes/kubeadm/kubeadm-config.yaml

C содержимым:

apiVersion: kubeadm.k8s.io/v1beta1

kind: ClusterConfiguration

kubernetesVersion: stable

controlPlaneEndpoint: "192.168.1.120:6443"

networking:

podSubnet: 192.168.0.0/16

Обозначения:
kubernetesVersion	Версия kubernetes
controlPlaneEndpoint	IP адрес api, мы указываем ip нашего балансировщика
podSubnet	Сеть для pod-ов

Инициализируем кластер с указанием нашего конфига и флагом —upload-certs. С версии 1.14 появилась возможность загружать сертификаты в etcd.

kubeadm init --config=/etc/kubernetes/kubeadm/kubeadm-config.yaml --upload-certs

Примечание!!!!!!!

[codesyntax lang="php" blockstate="collapsed"]

Kubeadm сгенерирует нам сертификаты, конфиги для компонентов Kubernetes, и команды для join.

Начиная с версии 1.14 в kubeadm появилась функция join для мастеров и оператор для etcd. Что позволяет быстро добавлять новые мастера в кластер

Теперь мы просто запускаем команду для join мастеров на 2(3,4…) сервере и kubeadm автоматом выкачает сертификаты и перепишет  конфиг для etcd.

Kubeadm сгенерирует нам сертификаты, конфиги для компонентов Kubernetes, и команды для join.

Начиная с версии 1.14 в kubeadm появилась функция join для мастеров и оператор для etcd. Что позволяет быстро добавлять новые мастера в кластер

Теперь мы просто запускаем команду для join мастеров на 2(3,4…) сервере и kubeadm автоматом выкачает сертификаты и перепишет конфиг для etcd.

[/codesyntax]

при запуске данной команды может возникнуть следующая ошибка:
[root@kub-master-121 ~]# kubeadm init --config=/etc/kubernetes/kubeadm/kubeadm-config.yaml --upload-certs
W0126 16:48:07.358693 14441 common.go:77] your configuration file uses a deprecated API spec: "kubeadm.k8s.io/v1beta1". Please use 'kubeadm config migrate --old-config old.yaml --new-config new.yaml', which will write the new, similar spec using a newer API version.
W0126 16:48:07.358928 14441 strict.go:54] error unmarshaling configuration schema.GroupVersionKind{Group:"kubeadm.k8s.io", Version:"v1beta1", Kind:"ClusterConfiguration"}: error unmarshaling JSON: while decoding JSON: json: unknown field "\u00a0\u00a0podSubnet"
W0126 16:48:08.378766 14441 validation.go:28] Cannot validate kube-proxy config - no validator is available
W0126 16:48:08.378873 14441 validation.go:28] Cannot validate kubelet config - no validator is available
[init] Using Kubernetes version: v1.17.2
[preflight] Running pre-flight checks
[WARNING Hostname]: hostname "kub-master-121" could not be reached
[WARNING Hostname]: hostname "kub-master-121": lookup kub-master-121 on 8.8.8.8:53: no such host
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'

запустим что рекомендуется:
[root@kub-master-121 ~]# kubeadm config migrate --old-config /etc/kubernetes/kubeadm/kubeadm-config.yaml --new-config /etc/kubernetes/kubeadm/kubeadm-config-new.yaml
W0126 16:50:33.453918 14598 strict.go:54] error unmarshaling configuration schema.GroupVersionKind{Group:"kubeadm.k8s.io", Version:"v1beta1", Kind:"ClusterConfiguration"}: error unmarshaling JSON: while decoding JSON: json: unknown field "\u00a0\u00a0podSubnet"
W0126 16:50:34.532884 14598 validation.go:28] Cannot validate kubelet config - no validator is available
W0126 16:50:34.532916 14598 validation.go:28] Cannot validate kube-proxy config - no validator is available

новый файл выглядит следующим образом:
cat /etc/kubernetes/kubeadm/kubeadm-config-new.yaml

[codesyntax lang="php" blockstate="collapsed"]

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: fey0rr.e29qe2vp4mk8sr15
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.1.121
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: kub-master-121
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 192.168.1.120:6443
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.17.2
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.96.0.0/12
scheduler: {}

apiVersion: kubeadm.k8s.io/v1beta2

bootstrapTokens:

- groups:

- system:bootstrappers:kubeadm:default-node-token

token: fey0rr.e29qe2vp4mk8sr15

ttl: 24h0m0s

usages:

- signing

- authentication

kind: InitConfiguration

localAPIEndpoint:

advertiseAddress: 192.168.1.121

bindPort: 6443

nodeRegistration:

criSocket: /var/run/dockershim.sock

name: kub-master-121

taints:

- effect: NoSchedule

key: node-role.kubernetes.io/master

---

apiServer:

timeoutForControlPlane: 4m0s

apiVersion: kubeadm.k8s.io/v1beta2

certificatesDir: /etc/kubernetes/pki

clusterName: kubernetes

controlPlaneEndpoint: 192.168.1.120:6443

controllerManager: {}

dns:

type: CoreDNS

etcd:

local:

dataDir: /var/lib/etcd

imageRepository: k8s.gcr.io

kind: ClusterConfiguration

kubernetesVersion: v1.17.2

networking:

dnsDomain: cluster.local

serviceSubnet: 10.96.0.0/12

scheduler: {}

[/codesyntax]

запустим инициацию с новым конфигом:
[root@kub-master-121 ~]# kubeadm init --config=/etc/kubernetes/kubeadm/kubeadm-config-new.yaml --upload-certs

результат выполнения следующий:
[codesyntax lang="php" blockstate="collapsed"]

W0126 16:52:19.241100   14605 validation.go:28] Cannot validate kube-proxy config - no validator is available
W0126 16:52:19.241304   14605 validation.go:28] Cannot validate kubelet config - no validator is available
[init] Using Kubernetes version: v1.17.2
[preflight] Running pre-flight checks
        [WARNING Hostname]: hostname "kub-master-121" could not be reached
        [WARNING Hostname]: hostname "kub-master-121": lookup kub-master-121 on 8.8.8.8:53: no such host
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kub-master-121 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.1.121 192.168.1.120]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [kub-master-121 localhost] and IPs [192.168.1.121 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [kub-master-121 localhost] and IPs [192.168.1.121 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
W0126 16:53:29.134465   14605 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[control-plane] Creating static Pod manifest for "kube-scheduler"
W0126 16:53:29.135384   14605 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 35.510449 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.17" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
5f362f91181397c2579e2c0d90befa28b641f58c53fd14a8f06dc1fb4faba53c
[mark-control-plane] Marking the node kub-master-121 as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node kub-master-121 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: fey0rr.e29qe2vp4mk8sr15
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

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

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/

You can now join any number of the control-plane node running the following command on each as root:

  kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \
    --discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c \
    --control-plane --certificate-key 5f362f91181397c2579e2c0d90befa28b641f58c53fd14a8f06dc1fb4faba53c

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \
    --discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c

W0126 16:52:19.241100 14605 validation.go:28] Cannot validate kube-proxy config - no validator is available

W0126 16:52:19.241304 14605 validation.go:28] Cannot validate kubelet config - no validator is available

[init] Using Kubernetes version: v1.17.2

[preflight] Running pre-flight checks

[WARNING Hostname]: hostname "kub-master-121" could not be reached

[WARNING Hostname]: hostname "kub-master-121": lookup kub-master-121 on 8.8.8.8:53: no such host

[preflight] Pulling images required for setting up a Kubernetes cluster

[preflight] This might take a minute or two, depending on the speed of your internet connection

[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'

[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"

[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"

[kubelet-start] Starting the kubelet

[certs] Using certificateDir folder "/etc/kubernetes/pki"

[certs] Generating "ca" certificate and key

[certs] Generating "apiserver" certificate and key

[certs] apiserver serving cert is signed for DNS names [kub-master-121 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.1.121 192.168.1.120]

[certs] Generating "apiserver-kubelet-client" certificate and key

[certs] Generating "front-proxy-ca" certificate and key

[certs] Generating "front-proxy-client" certificate and key

[certs] Generating "etcd/ca" certificate and key

[certs] Generating "etcd/server" certificate and key

[certs] etcd/server serving cert is signed for DNS names [kub-master-121 localhost] and IPs [192.168.1.121 127.0.0.1 ::1]

[certs] Generating "etcd/peer" certificate and key

[certs] etcd/peer serving cert is signed for DNS names [kub-master-121 localhost] and IPs [192.168.1.121 127.0.0.1 ::1]

[certs] Generating "etcd/healthcheck-client" certificate and key

[certs] Generating "apiserver-etcd-client" certificate and key

[certs] Generating "sa" key and public key

[kubeconfig] Using kubeconfig folder "/etc/kubernetes"

[kubeconfig] Writing "admin.conf" kubeconfig file

[kubeconfig] Writing "kubelet.conf" kubeconfig file

[kubeconfig] Writing "controller-manager.conf" kubeconfig file

[kubeconfig] Writing "scheduler.conf" kubeconfig file

[control-plane] Using manifest folder "/etc/kubernetes/manifests"

[control-plane] Creating static Pod manifest for "kube-apiserver"

[control-plane] Creating static Pod manifest for "kube-controller-manager"

W0126 16:53:29.134465 14605 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"

[control-plane] Creating static Pod manifest for "kube-scheduler"

W0126 16:53:29.135384 14605 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"

[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"

[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s

[apiclient] All control plane components are healthy after 35.510449 seconds

[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace

[kubelet] Creating a ConfigMap "kubelet-config-1.17" in namespace kube-system with the configuration for the kubelets in the cluster

[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace

[upload-certs] Using certificate key:

5f362f91181397c2579e2c0d90befa28b641f58c53fd14a8f06dc1fb4faba53c

[mark-control-plane] Marking the node kub-master-121 as control-plane by adding the label "node-role.kubernetes.io/master=''"

[mark-control-plane] Marking the node kub-master-121 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]

[bootstrap-token] Using token: fey0rr.e29qe2vp4mk8sr15

[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles

[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials

[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token

[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster

[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace

[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key

[addons] Applied essential addon: CoreDNS

[addons] Applied essential addon: kube-proxy

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

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/

You can now join any number of the control-plane node running the following command on each as root:

kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \

--discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c \

--control-plane --certificate-key 5f362f91181397c2579e2c0d90befa28b641f58c53fd14a8f06dc1fb4faba53c

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!

As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use

"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \

--discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c

[/codesyntax]

Создаем директорию и кладем туда конфигурационный файл для подключения к kubernetes API:

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

Проверяем работоспособность нашего API

kubectl get nodes

Должны получить ответ:

[root@kub-master-121 ~]# kubectl get nodes
NAME             STATUS     ROLES    AGE     VERSION
kub-master-121   NotReady   master   2m35s   v1.17.2

[root@kub-master-121 ~]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

kub-master-121 NotReady master 2m35s v1.17.2

Далее копируем команду для join мастеров и запускаем ее на 2 и 3 сервере:

kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \
--discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c \
--control-plane --certificate-key 5f362f91181397c2579e2c0d90befa28b641f58c53fd14a8f06dc1fb4faba53c

После удачного завершения мы увидим новые мастера

kubectl get nodes

[root@kub-master-121 ~]# kubectl get nodes
NAME             STATUS     ROLES    AGE     VERSION
kub-master-121   NotReady   master   9m35s   v1.17.2
kub-master-122   NotReady   master   2m57s   v1.17.2
kub-master-123   NotReady   master   2m45s   v1.17.2

[root@kub-master-121 ~]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

kub-master-121 NotReady master 9m35s v1.17.2

kub-master-122 NotReady master 2m57s v1.17.2

kub-master-123 NotReady master 2m45s v1.17.2

Сертификаты будут удаленны через 2 часа, токен для join будет удален через 24 часа, токен для выгрузки сертификатов удалится через 1 час

Смотрим наши токены :

kubeadm token list

[root@kub-master-121 ~]# kubeadm token list
TOKEN                     TTL         EXPIRES                     USAGES                   DESCRIPTION                                                EXTRA GROUPS
78v1n8.h0ovwq6dhcu98pao   1h          2020-01-26T18:54:05+06:00   &lt;none&gt;                   Proxy for managing TTL for the kubeadm-certs secret        &lt;none&gt;
fey0rr.e29qe2vp4mk8sr15   23h         2020-01-27T16:54:05+06:00   authentication,signing   &lt;none&gt;                                                     system:bootstrappers:kubeadm:default-node-token

[root@kub-master-121 ~]# kubeadm token list

TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS

78v1n8.h0ovwq6dhcu98pao 1h 2020-01-26T18:54:05+06:00 <none> Proxy for managing TTL for the kubeadm-certs secret <none>

fey0rr.e29qe2vp4mk8sr15 23h 2020-01-27T16:54:05+06:00 authentication,signing <none> system:bootstrappers:kubeadm:default-node-token

воркер ноды добавляем командой:
kubeadm join 192.168.1.120:6443 --token fey0rr.e29qe2vp4mk8sr15 \ --discovery-token-ca-cert-hash sha256:dadc52e26eba9da1e96cc005e8339e92426cecd6ce948536b06382cc79a1b07c

проверяем:

[root@kub-master-121 ~]# kubectl get nodes
NAME             STATUS     ROLES    AGE     VERSION
kub-master-121   <strong>NotReady  </strong> master   45m     v1.17.2
kub-master-122   <strong>NotReady  </strong> master   39m     v1.17.2
kub-master-123   <strong>NotReady  </strong> master   39m     v1.17.2
kub-work-124     <strong>NotReady  </strong> &lt;none&gt;   2m18s   v1.17.2
kub-work-125     <strong>NotReady  </strong> &lt;none&gt;   52s     v1.17.2

[root@kub-master-121 ~]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

kub-master-121 NotReady master 45m v1.17.2

kub-master-122 NotReady master 39m v1.17.2

kub-master-123 NotReady master 39m v1.17.2

kub-work-124 NotReady <none> 2m18s v1.17.2

kub-work-125 NotReady <none> 52s v1.17.2

Все сервера добавлены, но они в статусе NotReady. Это из-за отсутствия сети. В нашем примере мы будем использовать сеть calico. Для этого установим ее в наш кластер

Заходим на оф сайт. На момент написания статьи самая последняя версия:
https://docs.projectcalico.org/v3.11/introduction/

выкачиваем её

curl https://docs.projectcalico.org/v3.11/manifests/calico.yaml -O

kubectl apply -f calico.yaml

ждём пару минут и проверяем:
kubectl get nodes

[root@kub-master-121 ~]# kubectl get nodes
NAME             STATUS   ROLES    AGE   VERSION
kub-master-121   <strong>Ready   </strong> master   55m   v1.17.2
kub-master-122   <strong>Ready   </strong> master   48m   v1.17.2
kub-master-123   <strong>Ready   </strong> master   48m   v1.17.2
kub-work-124     <strong>Ready   </strong> &lt;none&gt;   11m   v1.17.2
kub-work-125     <strong>Ready   </strong> &lt;none&gt;   10m   v1.17.2

[root@kub-master-121 ~]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

kub-master-121 Ready master 55m v1.17.2

kub-master-122 Ready master 48m v1.17.2

kub-master-123 Ready master 48m v1.17.2

kub-work-124 Ready <none> 11m v1.17.2

kub-work-125 Ready <none> 10m v1.17.2

базовая установка завершена.

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

сгенерировать токен для добавления воркеров:
kubeadm token generate
kubeadm token create <generated-token> --print-join-command --ttl=24h

Centos

Kubernetes. Установка 3 мастера 2 воркера 1 баллансировщик

Балансировщик нагрузки NGINX

Kubernetes

Мастер ноды:

https://github.com/midnight47/

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