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 |
---|---|---|
ansible | 192.168.175.130 | ansible |
master | 192.168.175.140 | docker,kubectl,kubeadm,kubelet |
node | 192.168.175.141 | docker,kubectl,kubeadm,kubelet |
node | 192.168.175.142 | docker,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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