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Kubespray部署Kubernetes 1.13.0(使用本地镜像仓库)

1. 下载kubespray

# git clone https://github.com/kubernetes-sigs/kubespray.git
# cd kubespray
# pip install –r requirements.txt

2. 生成inventory文件

# cp -r inventory/sample inventory/testcluster

如果安装了python3,执行下面的命令自动生成inventory文件:

# declare -a IPS=(10.32.3.80 10.32.3.81 10.32.3.82)
# CONFIG_FILE=inventory/testcluster/hosts.ini python3 contrib/inventory_builder/inventory.py

否则手动编辑inventory/testcluster/hosts.ini:

[all]
node1 ansible_ssh_host=10.32.3.80 ansible_user=root etcd_member_name=etcd1
node2 ansible_ssh_host=10.32.3.81 ansible_user=root etcd_member_name=etcd2
node3 ansible_ssh_host=10.32.3.82 ansible_user=root etcd_member_name=etcd3

[kube-master]
node1
node2
node3

[etcd]
node1
node2
node3

[kube-node]
node1
node2
node3

[k8s-cluster:children]
kube-master
kube-node

3. 下载镜像并上传到本地仓库

我的方法是先执行download tag:

# ansible-playbook -i inventory/testcluster/hosts.ini cluster.yml -t download -b -v -k

遇到下载的镜像会报错停下,然后手动在一台配置了docker proxy的机器上从pull官方镜像,打上tag后push到本地镜像仓库。
以下docker镜像上传到本地镜像仓库:

gcr.io/google_containers/cluster-proportional-autoscaler-amd64:1.3.0
gcr.io/google_containers/pause-amd64:3.1
lachlanevenson/k8s-helm:v2.11.0
quay.io/coreos/etcd:v3.2.24
quay.io/calico/ctl:v3.1.3
quay.io/calico/node:v3.1.3
quay.io/calico/cni:v3.1.3
quay.io/calico/kube-controllers:v3.1.3
quay.io/calico/routereflector:v0.6.1
gcr.io/kubernetes-helm/tiller:v2.11.0
nginx:1.13
gcr.io/google_containers/kubernetes-dashboard-amd64:v1.10.0
quay.io/jetstack/cert-manager-controller:v0.5.2
quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.21.0
quay.io/external_storage/local-volume-provisioner:v2.1.0
quay.io/external_storage/cephfs-provisioner:v2.1.0-k8s1.11
k8s.gcr.io/addon-resizer:1.8.3
k8s.gcr.io/metrics-server-amd64:v0.3.1
coredns/coredns:1.2.6
gcr.io/google-containers/kube-apiserver:v1.13.0
gcr.io/google-containers/kube-controller-manager:v1.13.0
gcr.io/google-containers/kube-scheduler:v1.13.0
gcr.io/google-containers/kube-proxy:v1.13.0
gcr.io/google-containers/pause:3.1
gcr.io/google-containers/coredns:1.2.6

以下文件上传到本地http服务器:

https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/kubeadm
https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/hyperkube
https://github.com/coreos/etcd/releases/download/v3.2.24/etcd-v3.2.24-linux-amd64.tar.gz
https://github.com/containernetworking/plugins/releases/download/v0.6.0/cni-plugins-amd64-v0.6.0.tgz

4. 替换下载地址

镜像地址集中配置在roles/download/defaults/main.yml文件中,修改如下:

kube_image_repo: "gcr.io/google-containers"
kube_image_repo: "registry.example.com/google_containers"

gcr.io/google_containers/cluster-proportional-autoscaler-{{ image_arch }}
registry.example.com/google_containers/cluster-proportional-autoscaler-{{ image_arch }}

gcr.io/google_containers/pause-{{ image_arch }}
registry.example.com/google_containers/pause-{{ image_arch }}

lachlanevenson/k8s-helm
registry.example.com/lachlanevenson/k8s-helm

quay.io/coreos/etcd
registry.example.com/coreos/etcd

quay.io/calico/ctl
registry.example.com/calico/ctl

quay.io/calico/node
registry.example.com/calico/node

quay.io/calico/cni
registry.example.com/calico/cni

quay.io/calico/kube-controllers
registry.example.com/calico/kube-controllers

quay.io/calico/routereflector
registry.example.com/calico/routereflector

gcr.io/kubernetes-helm/tiller
registry.example.com/kubernetes-helm/tiller

nginx_image_repo: nginx
nginx_image_repo: registry.example.com/common/nginx

gcr.io/google_containers/kubernetes-dashboard-{{ image_arch }}
registry.example.com/google_containers/kubernetes-dashboard-{{ image_arch }}

quay.io/jetstack/cert-manager-controller
registry.example.com/jetstack/cert-manager-controller

quay.io/kubernetes-ingress-controller/nginx-ingress-controller
registry.example.com/kubernetes-ingress-controller/nginx-ingress-controller

quay.io/external_storage/local-volume-provisioner
registry.example.com/external_storage/local-volume-provisioner

quay.io/external_storage/cephfs-provisioner
registry.example.com/external_storage/cephfs-provisioner

k8s.gcr.io/addon-resizer
registry.example.com/google_containers/addon-resizer

k8s.gcr.io/metrics-server-amd64
registry.example.com/google_containers/metrics-server-amd64

coredns/coredns
registry.example.com/coredns/coredns

https://storage.googleapis.com/kubernetes-release/release/{{ kubeadm_version }}/bin/linux/{{ image_arch }}/kubeadm
http://10.204.250.110/kubernetes-release/release/{{ kubeadm_version }}/bin/linux/{{ image_arch }}/kubeadm

https://storage.googleapis.com/kubernetes-release/release/{{ kube_version }}/bin/linux/amd64/hyperkube
http://10.204.250.110/kubernetes-release/release/{{ kube_version }}/bin/linux/amd64/hyperkube

https://github.com/coreos/etcd/releases/download/{{ etcd_version }}/etcd-{{ etcd_version }}-linux-amd64.tar.gz
http://10.204.250.110/coreos/etcd/releases/download/{{ etcd_version }}/etcd-{{ etcd_version }}-linux-amd64.tar.gz

https://github.com/containernetworking/plugins/releases/download/{{ cni_version }}/cni-plugins-{{ image_arch }}-{{ cni_version }}.tgz
http://10.204.250.110/containernetworking/plugins/releases/download/{{ cni_version }}/cni-plugins-{{ image_arch }}-{{ cni_version }}.tgz

5. 配置部署参数

根据实际环境修改inventory/testcluster/group_vars/k8s-cluster/k8s-cluster.yml中kube_image_repo、kube_service_addresses和kube_pods_subnet的值,比如:

kube_service_addresses: 10.200.0.0/16
kube_pods_subnet: 172.27.0.0/16
kube_image_repo: "registry.example.com/google_containers"

修改roles/kubernetes-apps/helm/defaults/main.yml中的helm stable repo:

helm_stable_repo_url: "https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts"

6. 启用addons

编辑inventory/testcluster/group_vars/k8s-cluster/addons.yml,将需要的addon设为true,并配置对应的参数。比如我这里启用了dashboard、heml、local_volume_provisioner、cephfs_provisioner、ingress_nginx和cert_manager:

dashboard_enabled: true
helm_enabled: true
registry_enabled: false
metrics_server_enabled: true
local_volume_provisioner_enabled: true
cephfs_provisioner_enabled: true
cephfs_provisioner_namespace: "cephfs-provisioner"
cephfs_provisioner_cluster: ceph
cephfs_provisioner_monitors: "10.32.3.70:6789,10.32.3.71:6789,10.32.3.72:6789"
cephfs_provisioner_admin_id: k8s
cephfs_provisioner_secret: AQBCk+tbHeLjORAAHiUMFIeu8f76JWBWlCWfbg==
cephfs_provisioner_storage_class: cephfs
cephfs_provisioner_reclaim_policy: Delete
cephfs_provisioner_claim_root: /k8s_volumes
cephfs_provisioner_deterministic_names: true
ingress_nginx_enabled: true
cert_manager_enabled: true

7. 部署集群

做好以上准备工作后,正式开始部署集群:

# ansible all -i inventory/mycluster/hosts.ini -m command -a 'swapoff -a' -u root -k    # 所有节点关闭交换分区
# ansible-playbook -i inventory/testcluster/hosts.ini cluster.yml -b -v -k

8. 添加节点

后续如果要增加新的节点,执行下面的命令:

# ansible-playbook -i inventory/testcluster/hosts.ini scale.yml -b -v -u root -k

9. 删除节点

不指定节点就是删除整个集群:

# ansible-playbook -i inventory/testcluster/hosts.ini remove-node.yml -b -v

10. 集群验证

查看节点状态:

# kubectl get nodes
NAME    STATUS   ROLES         AGE     VERSION
node1   Ready    master,node   8m41s   v1.13.0
node2   Ready    master,node   7m57s   v1.13.0
node3   Ready    master,node   7m58s   v1.13.0

修改kube-dashboard service的类型为NodePort,就可以通过任意一个节点访问dashboard:

# kubectl edit service -n kube-system kubernetes-dashboard
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  clusterIP: 10.200.108.205
  externalTrafficPolicy: Cluster
  ports:
  - nodePort: 30443
    port: 443
    protocol: TCP
    targetPort: 8443
  selector:
    k8s-app: kubernetes-dashboard
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

访问dashboard:

11. 后续  

1.13.0版本不再使用hyperkube去启master的各个服务,而是将kube-apiserver、kube-scheduler、kube-controller-manager分别打包镜像(不知道是不是从1.13.0开始的,我上一个使用的版本是1.10.4,还是通过hyperkube的方式启的)。

部署完之后发现kube-controller-manager中没有安装ceph相关的包,导致Ceph RBD StorageClass无法使用(CephFS StorageClass是正常的,因为它是由独立的cephfs-provisioner管理的)。所以需要自己重新build kube-controller-manager装上rbd相关的包。

参考资料
kubespray - Getting started(https://github.com/kubernetes-sigs/kubespray/blob/master/docs/getting-started.md)

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