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Ansible部署K8s集群的方法

 更新时间：2022年02月28日 08:27:29   作者：wuenwuen  
这篇文章主要介绍了Ansible部署K8s集群,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下

环境：

主机IP地址组件
ansible192.168.175.130ansible
master192.168.175.140docker，kubectl，kubeadm，kubelet
node192.168.175.141docker，kubectl，kubeadm，kubelet
node192.168.175.142docker，kubectl，kubeadm，kubelet

检查及调试相关命令：

$ ansible-playbook -v k8s-time-sync.yaml --syntax-check
$ ansible-playbook -v k8s-*.yaml -C 
$ ansible-playbook -v k8s-yum-cfg.yaml -C --start-at-task="Clean origin dir" --step
$ ansible-playbook -v k8s-kernel-cfg.yaml --step

主机inventory文件：

/root/ansible/hosts

[k8s_cluster]
master ansible_host=192.168.175.140
node1  ansible_host=192.168.175.141
node2  ansible_host=192.168.175.142

[k8s_cluster:vars]
ansible_port=22
ansible_user=root
ansible_password=hello123

检查网络：k8s-check.yaml检查k8s各主机的网络是否可达;

检查k8s各主机操作系统版本是否达到要求；

- name: step01_check
  hosts: k8s_cluster
  gather_facts: no
  tasks:
    - name: check network
      shell:
        cmd: "ping -c 3 -m 2 {{ansible_host}}"
      delegate_to: localhost

    - name: get system version
      shell: cat /etc/system-release
      register: system_release

    - name: check system version
      vars:
        system_version: "{{ system_release.stdout | regex_search('([7-9].[0-9]+).*?') }}"
        suitable_version: 7.5
      debug:
        msg: "{{ 'The version of the operating system is '+ system_version +', suitable!' if (system_version | float >= suitable_version) else 'The version of the operating system is unsuitable' }}"

调试命令：

$ ansible-playbook --ssh-extra-args '-o StrictHostKeyChecking=no' -v -C k8s-check.yaml
$ ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -v -C k8s-check.yaml
$ ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -v k8s-check.yaml --start-at-task="get system version"
  • 连接配置：k8s-conn-cfg.yaml在ansible服务器的/etc/hosts文件中添加k8s主机名解析配置
  • 生成密钥对，配置ansible免密登录到k8s各主机
- name: step02_conn_cfg
  hosts: k8s_cluster
  gather_facts: no
  vars_prompt:
    - name: RSA
      prompt: Generate RSA or not(Yes/No)?
      default: "no"
      private: no

    - name: password
      prompt: input your login password?
      default: "hello123"
  tasks:
    - name: Add DNS of k8s to ansible
      delegate_to: localhost
      lineinfile:
        path: /etc/hosts
        line: "{{ansible_host}}  {{inventory_hostname}}"
        backup: yes
    - name: Generate RSA
      run_once: true
      shell:
        cmd: ssh-keygen -t rsa -f ~/.ssh/id_rsa -N ''
        creates: /root/.ssh/id_rsa
      when: RSA | bool
    - name: Configure password free login
      shell: |
          /usr/bin/ssh-keyscan {{ ansible_host }} >> /root/.ssh/known_hosts 2> /dev/null
          /usr/bin/ssh-keyscan {{ inventory_hostname }} >> /root/.ssh/known_hosts 2> /dev/null
          /usr/bin/sshpass -p'{{ password }}' ssh-copy-id root@{{ ansible_host }}
          #/usr/bin/sshpass -p'{{ password }}' ssh-copy-id root@{{ inventory_hostname }}
    - name: Test ssh
      shell: hostname

执行：

$ ansible-playbook k8s-conn-cfg.yaml
Generate RSA or not(Yes/No)? [no]: yes
input your login password? [hello123]:

PLAY [step02_conn_cfg] **********************************************************************************************************
TASK [Add DNS of k8s to ansible] ************************************************************************************************
ok: [master -> localhost]
ok: [node1 -> localhost]
ok: [node2 -> localhost]
TASK [Generate RSA] *************************************************************************************************************
changed: [master -> localhost]
TASK [Configure password free login] ********************************************************************************************
changed: [node1 -> localhost]
changed: [node2 -> localhost]
TASK [Test ssh] *****************************************************************************************************************
changed: [master]
changed: [node1]
changed: [node2]
PLAY RECAP **********************************************************************************************************************
master                     : ok=4    changed=3    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node1                      : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node2                      : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

配置k8s集群dns解析： k8s-hosts-cfg.yaml

  • 设置主机名

  • /etc/hosts文件中互相添加dns解析

- name: step03_cfg_host
  hosts: k8s_cluster
  gather_facts: no
  tasks:
    - name: set hostname
      hostname:
        name: "{{ inventory_hostname }}"
        use: systemd
    - name: Add dns to each other
      lineinfile:
        path: /etc/hosts
        backup: yes
        line: "{{item.value.ansible_host}}  {{item.key}}"
      loop: "{{ hostvars | dict2items }}"
      loop_control:
        label: "{{ item.key }} {{ item.value.ansible_host }}"

执行：

$ ansible-playbook k8s-hosts-cfg.yaml

PLAY [step03_cfg_host] **********************************************************************************************************
TASK [set hostname] *************************************************************************************************************
ok: [master]
ok: [node1]
ok: [node2]
TASK [Add dns to each other] ****************************************************************************************************
ok: [node2] => (item=node1 192.168.175.141)
ok: [master] => (item=node1 192.168.175.141)
ok: [node1] => (item=node1 192.168.175.141)
ok: [node2] => (item=node2 192.168.175.142)
ok: [master] => (item=node2 192.168.175.142)
ok: [node1] => (item=node2 192.168.175.142)
ok: [node2] => (item=master 192.168.175.140)
ok: [master] => (item=master 192.168.175.140)
ok: [node1] => (item=master 192.168.175.140)
PLAY RECAP **********************************************************************************************************************
master                     : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node1                      : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node2                      : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

配置yum源：k8s-yum-cfg.yaml

- name: step04_yum_cfg
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Create back-up directory
      file:
        path: /etc/yum.repos.d/org/
        state: directory
    - name: Back-up old Yum files
      shell:
        cmd: mv -f /etc/yum.repos.d/*.repo /etc/yum.repos.d/org/
        removes: /etc/yum.repos.d/org/
    - name: Add new Yum files
      copy:
        src: ./files_yum/
        dest: /etc/yum.repos.d/
    - name: Check yum.repos.d
        cmd: ls /etc/yum.repos.d/*

时钟同步：k8s-time-sync.yaml

- name: step05_time_sync
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Start chronyd.service
      systemd:
        name: chronyd.service
        state: started
        enabled: yes
    - name: Modify time zone & clock
      shell: |
        cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
        clock -w
        hwclock -w
    - name: Check time now
      command: date

禁用iptable、firewalld、NetworkManager服务

- name: step06_net_service
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Stop some services for net
      systemd:
        name: "{{ item }}"
        state: stopped
        enabled: no
      loop:
        - firewalld
        - iptables
        - NetworkManager

执行：

$ ansible-playbook -v k8s-net-service.yaml
... ...
failed: [master] (item=iptables) => {
    "ansible_loop_var": "item",
    "changed": false,
    "item": "iptables"
}

MSG:
Could not find the requested service iptables: host
PLAY RECAP **********************************************************************************************************************
master                     : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
node1                      : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
node2                      : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0

禁用SElinux、swap：k8s-SE-swap-disable.yaml

- name: step07_net_service
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: SElinux disabled
      lineinfile:
        path: /etc/selinux/config
        line: SELINUX=disabled
        regexp: ^SELINUX=
        state: present
        backup: yes
    - name: Swap disabled
        path: /etc/fstab
        line: '#\1'
        regexp: '(^/dev/mapper/centos-swap.*$)'
        backrefs: yes

修改内核：k8s-kernel-cfg.yaml

- name: step08_kernel_cfg
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Create /etc/sysctl.d/kubernetes.conf
      copy:
        content: ''
        dest: /etc/sysctl.d/kubernetes.conf
        force: yes
    - name: Cfg bridge and ip_forward
      lineinfile:
        path: /etc/sysctl.d/kubernetes.conf
        line: "{{ item }}"
        state: present
      loop:
        - 'net.bridge.bridge-nf-call-ip6tables = 1'
        - 'net.bridge.bridge-nf-call-iptables = 1'
        - 'net.ipv4.ip_forward = 1'
    - name: Load cfg
      shell:
        cmd: |
          sysctl -p
          modprobe br_netfilter
        removes: /etc/sysctl.d/kubernetes.conf
    - name: Check cfg
        cmd: '[ $(lsmod | grep br_netfilter | wc -l) -ge 2 ] && exit 0 || exit 3'

执行：

$ ansible-playbook -v k8s-kernel-cfg.yaml --step

TASK [Check cfg] ****************************************************************************************************************
changed: [master] => {
    "changed": true,
    "cmd": "[ $(lsmod | grep br_netfilter | wc -l) -ge 2 ] && exit 0 || exit 3",
    "delta": "0:00:00.011574",
    "end": "2022-02-27 04:26:01.332896",
    "rc": 0,
    "start": "2022-02-27 04:26:01.321322"
}
changed: [node2] => {
    "delta": "0:00:00.016331",
    "end": "2022-02-27 04:26:01.351208",
    "start": "2022-02-27 04:26:01.334877"
changed: [node1] => {
    "delta": "0:00:00.016923",
    "end": "2022-02-27 04:26:01.355983",
    "start": "2022-02-27 04:26:01.339060"
PLAY RECAP **********************************************************************************************************************
master                     : ok=4    changed=4    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node1                      : ok=4    changed=4    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
node2                      : ok=4    changed=4    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

配置ipvs：k8s-ipvs-cfg.yaml

- name: step09_ipvs_cfg
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Install ipset and ipvsadm
      yum:
        name: "{{ item }}"
        state: present
      loop:
        - ipset
        - ipvsadm
    - name: Load modules
      shell: |
        modprobe -- ip_vs
        modprobe -- ip_vs_rr
        modprobe -- ip_vs_wrr
        modprobe -- ip_vs_sh
        modprobe -- nf_conntrack_ipv4
    - name: Check cfg
      shell:
        cmd: '[ $(lsmod | grep -e -ip_vs -e nf_conntrack_ipv4 | wc -l) -ge 2 ] && exit 0 || exit 3'

安装docker：k8s-docker-install.yaml

- name: step10_docker_install
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Install docker-ce
      yum:
        name: docker-ce-18.06.3.ce-3.el7
        state: present
    - name: Cfg docker
      copy:
        src: ./files_docker/daemon.json
        dest: /etc/docker/
    - name: Start docker
      systemd:
        name: docker.service
        state: started
        enabled: yes
        
    - name: Check docker version
      shell:
        cmd: docker --version

安装k8s组件[kubeadm\kubelet\kubectl]：k8s-install-kubepkgs.yaml

- name: step11_k8s_install_kubepkgs
  hosts: k8s_cluster
  gather_facts: no
  tasks:

    - name: Install k8s components
      yum:
        name: "{{ item }}"
        state: present
      loop:
        - kubeadm-1.17.4-0
        - kubelet-1.17.4-0
        - kubectl-1.17.4-0
    - name: Cfg k8s
      copy:
        src: ./files_k8s/kubelet
        dest: /etc/sysconfig/
        force: no
        backup: yes
    - name: Start kubelet
      systemd:
        name: kubelet.service
        state: started
        enabled: yes

安装集群镜像：k8s-apps-images.yaml

- name: step12_apps_images
  hosts: k8s_cluster
  gather_facts: no

  vars:
    apps:
      - kube-apiserver:v1.17.4
      - kube-controller-manager:v1.17.4
      - kube-scheduler:v1.17.4
      - kube-proxy:v1.17.4
      - pause:3.1
      - etcd:3.4.3-0
      - coredns:1.6.5
  vars_prompt:
      - name: cfg_python
        prompt: Do you need to install docker pkg for python(Yes/No)?
        default: "no"
        private: no
  tasks:
    - block:
        - name: Install python-pip
          yum:
            name: python-pip
            state: present
        - name: Install docker pkg for python
          shell:
            cmd: |
              pip install docker==4.4.4
              pip install websocket-client==0.32.0
            creates: /usr/lib/python2.7/site-packages/docker/
      when: cfg_python | bool
    - name: Pull images
      community.docker.docker_image:
        name: "registry.cn-hangzhou.aliyuncs.com/google_containers/{{ item }}"
        source: pull
      loop: "{{ apps }}"
    - name: Tag images
        repository: "k8s.gcr.io/{{ item }}"
        force_tag: yes
        source: local
    - name: Remove images for ali
        state: absent

执行：

$ ansible-playbook k8s-apps-images.yaml
Do you need to install docker pkg for python(Yes/No)? [no]:

PLAY [step12_apps_images] *******************************************************************************************************
TASK [Install python-pip] *******************************************************************************************************
skipping: [node1]
skipping: [master]
skipping: [node2]
TASK [Install docker pkg for python] ********************************************************************************************
TASK [Pull images] **************************************************************************************************************
changed: [node1] => (item=kube-apiserver:v1.17.4)
changed: [node2] => (item=kube-apiserver:v1.17.4)
changed: [master] => (item=kube-apiserver:v1.17.4)
changed: [node1] => (item=kube-controller-manager:v1.17.4)
changed: [master] => (item=kube-controller-manager:v1.17.4)
changed: [node1] => (item=kube-scheduler:v1.17.4)
changed: [master] => (item=kube-scheduler:v1.17.4)
changed: [node1] => (item=kube-proxy:v1.17.4)
changed: [node2] => (item=kube-controller-manager:v1.17.4)
changed: [master] => (item=kube-proxy:v1.17.4)
changed: [node1] => (item=pause:3.1)
changed: [master] => (item=pause:3.1)
changed: [node2] => (item=kube-scheduler:v1.17.4)
changed: [node1] => (item=etcd:3.4.3-0)
changed: [master] => (item=etcd:3.4.3-0)
changed: [node2] => (item=kube-proxy:v1.17.4)
changed: [node1] => (item=coredns:1.6.5)
changed: [master] => (item=coredns:1.6.5)
changed: [node2] => (item=pause:3.1)
changed: [node2] => (item=etcd:3.4.3-0)
changed: [node2] => (item=coredns:1.6.5)
TASK [Tag images] ***************************************************************************************************************
ok: [node1] => (item=kube-apiserver:v1.17.4)
ok: [master] => (item=kube-apiserver:v1.17.4)
ok: [node2] => (item=kube-apiserver:v1.17.4)
ok: [node1] => (item=kube-controller-manager:v1.17.4)
ok: [master] => (item=kube-controller-manager:v1.17.4)
ok: [node2] => (item=kube-controller-manager:v1.17.4)
ok: [master] => (item=kube-scheduler:v1.17.4)
ok: [node1] => (item=kube-scheduler:v1.17.4)
ok: [node2] => (item=kube-scheduler:v1.17.4)
ok: [master] => (item=kube-proxy:v1.17.4)
ok: [node1] => (item=kube-proxy:v1.17.4)
ok: [node2] => (item=kube-proxy:v1.17.4)
ok: [master] => (item=pause:3.1)
ok: [node1] => (item=pause:3.1)
ok: [node2] => (item=pause:3.1)
ok: [master] => (item=etcd:3.4.3-0)
ok: [node1] => (item=etcd:3.4.3-0)
ok: [node2] => (item=etcd:3.4.3-0)
ok: [master] => (item=coredns:1.6.5)
ok: [node1] => (item=coredns:1.6.5)
ok: [node2] => (item=coredns:1.6.5)
TASK [Remove images for ali] ****************************************************************************************************
PLAY RECAP **********************************************************************************************************************
master                     : ok=3    changed=2    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0
node1                      : ok=3    changed=2    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0
node2                      : ok=3    changed=2    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0

k8s集群初始化：k8s-cluster-init.yaml

- name: step13_cluster_init
  hosts: master
  gather_facts: no
  tasks:
    - block:
        - name: Kubeadm init
          shell:
            cmd:
              kubeadm init
              --apiserver-advertise-address={{ ansible_host }}
              --kubernetes-version=v1.17.4
              --service-cidr=10.96.0.0/12
              --pod-network-cidr=10.244.0.0/16
              --image-repository registry.aliyuncs.com/google_containers

        - name: Create /root/.kube
          file:
            path: /root/.kube/
            state: directory
            owner: root
            group: root
        - name: Copy /root/.kube/config
          copy:
            src: /etc/kubernetes/admin.conf
            dest: /root/.kube/config
            remote_src: yes
            backup: yes
        - name: Copy kube-flannel
            src: ./files_k8s/kube-flannel.yml
            dest: /root/
        - name: Apply kube-flannel
            cmd: kubectl apply -f /root/kube-flannel.yml
        - name: Get token
            cmd: kubeadm token create --print-join-command
          register: join_token
        - name: debug join_token
          debug:
            var: join_token.stdout

到此这篇关于Ansible部署K8s集群的文章就介绍到这了,更多相关Ansible部署K8s集群内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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