main.yml

- name: 创建kube-node 相关目录
  file: name={{ item }} state=directory
  with_items:
  - /var/lib/kubelet
  - /var/lib/kube-proxy
  - /etc/cni/net.d

- name: 下载 kubelet,kube-proxy 二进制和基础 cni plugins
  copy: src={{ base_dir }}/bin/{{ item }} dest={{ bin_dir }}/{{ item }} mode=0755
  with_items:
  - kubectl
  - kubelet
  - kube-proxy
  - bridge
  - host-local
  - loopback
  tags: upgrade_k8s

# 每个 node 节点运行 haproxy 连接到多个 apiserver
- import_tasks: node_lb.yml
  when: "inventory_hostname not in groups['kube-master']"

- name: 替换 kubeconfig 的 apiserver 地址
  lineinfile:
    dest: /root/.kube/config
    regexp: "^    server"
    line: "    server: {{ KUBE_APISERVER }}"

##----------kubelet 配置部分--------------

- name: 准备kubelet 证书签名请求
  template: src=kubelet-csr.json.j2 dest={{ ca_dir }}/kubelet-csr.json

- name: 创建 kubelet 证书与私钥
  shell: "cd {{ ca_dir }} && {{ bin_dir }}/cfssl gencert \
        -ca={{ ca_dir }}/ca.pem \
        -ca-key={{ ca_dir }}/ca-key.pem \
        -config={{ ca_dir }}/ca-config.json \
        -profile=kubernetes kubelet-csr.json | {{ bin_dir }}/cfssljson -bare kubelet"

# 创建kubelet.kubeconfig 
- name: 设置集群参数
  shell: "{{ bin_dir }}/kubectl config set-cluster kubernetes \
        --certificate-authority={{ ca_dir }}/ca.pem \
        --embed-certs=true \
        --server={{ KUBE_APISERVER }} \
	--kubeconfig=/etc/kubernetes/kubelet.kubeconfig"

- name: 设置客户端认证参数
  shell: "{{ bin_dir }}/kubectl config set-credentials system:node:{{ inventory_hostname }} \
        --client-certificate={{ ca_dir }}/kubelet.pem \
        --embed-certs=true \
        --client-key={{ ca_dir }}/kubelet-key.pem \
	--kubeconfig=/etc/kubernetes/kubelet.kubeconfig"

- name: 设置上下文参数
  shell: "{{ bin_dir }}/kubectl config set-context default \
        --cluster=kubernetes \
	--user=system:node:{{ inventory_hostname }} \
	--kubeconfig=/etc/kubernetes/kubelet.kubeconfig"

- name: 选择默认上下文
  shell: "{{ bin_dir }}/kubectl config use-context default \
	--kubeconfig=/etc/kubernetes/kubelet.kubeconfig"

- name: 准备 cni配置文件
  template: src=cni-default.conf.j2 dest=/etc/cni/net.d/10-default.conf

# 判断 kubernetes 版本
- name: 注册变量 TMP_VER
  shell: "{{ base_dir }}/bin/kube-apiserver --version|cut -d' ' -f2|cut -d'v' -f2"
  register: TMP_VER
  connection: local
  tags: upgrade_k8s, restart_node

- name: 获取 kubernetes 主版本号
  set_fact:
    KUBE_VER: "{{ TMP_VER.stdout.split('.')[0]|int + TMP_VER.stdout.split('.')[1]|int/100 }}"
  tags: upgrade_k8s, restart_node

- name: debug info
  debug: var="KUBE_VER"

- name: 创建kubelet的配置文件
  template: src=kubelet-config.yaml.j2 dest=/var/lib/kubelet/config.yaml
  tags: upgrade_k8s, restart_node

- name: 创建kubelet的systemd unit文件
  template: src=kubelet.service.j2 dest=/etc/systemd/system/kubelet.service
  tags: upgrade_k8s, restart_node

- name: 开机启用kubelet 服务
  shell: systemctl enable kubelet
  ignore_errors: true

- name: 开启kubelet 服务
  shell: systemctl daemon-reload && systemctl restart kubelet
  tags: upgrade_k8s, restart_node

##-------kube-proxy部分----------------

- name: 替换 kube-proxy.kubeconfig 的 apiserver 地址
  lineinfile:
    dest: /etc/kubernetes/kube-proxy.kubeconfig
    regexp: "^    server"
    line: "    server: {{ KUBE_APISERVER }}"

- name: 创建kube-proxy 服务文件
  template: src=kube-proxy.service.j2 dest=/etc/systemd/system/kube-proxy.service
  tags: reload-kube-proxy, restart_node, upgrade_k8s

- name: 开机启用kube-proxy 服务
  shell: systemctl enable kube-proxy
  ignore_errors: true

- name: 开启kube-proxy 服务
  shell: systemctl daemon-reload && systemctl restart kube-proxy
  tags: reload-kube-proxy, upgrade_k8s, restart_node

# 轮询等待kubelet启动完成
- name: 轮询等待kubelet启动
  shell: "systemctl status kubelet.service|grep Active"
  register: kubelet_status
  until: '"running" in kubelet_status.stdout'
  retries: 8
  delay: 2
  tags: reload-kube-proxy, upgrade_k8s, restart_node

- name: 轮询等待node达到Ready状态
  shell: "{{ bin_dir }}/kubectl get node {{ inventory_hostname }}|awk 'NR>1{print $2}'"
  register: node_status
  until: node_status.stdout == "Ready" or node_status.stdout == "Ready,SchedulingDisabled"
  retries: 8 
  delay: 8
  tags: upgrade_k8s, restart_node

- name: 设置node节点role
  shell: "{{ bin_dir }}/kubectl label node {{ inventory_hostname }} kubernetes.io/role=node --overwrite"
  ignore_errors: true