kubespray部署k8s 1.26集群指南丨Kubernetes

kubespray部署k8s 1.26集群指南

前言

Kubespray 是一个自由开源的工具，它提供了 Ansible 剧本(playbook) 来部署和管理 Kubernetes 集群。它旨在简化跨多个节点的 Kubernetes 集群的安装过程，允许用户快速轻松地部署和管理生产就绪的 Kubernetes 集群。

它支持一系列操作系统，包括 Ubuntu、CentOS、Rocky Linux 和 Red Hat Enterprise Linux（RHEL），它可以在各种平台上部署 Kubernetes，包括裸机、公共云和私有云。

一、K8S集群节点准备

1.1 主机列表

1.2 主机名解析

# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.10.160 k8s-master01
192.168.10.161 k8s-master02
192.168.10.162 k8s-master03
192.168.10.163 k8s-worker01
192.168.10.164 k8s-worker02
192.168.10.165 kubespray

1.3 kubespray节点python3准备

本次需要使用python3.10

1.3.1 安装 openssl

[root@kubespray ~]# curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

[root@kubespray ~]# yum install -y ncurses-devel gdbm-devel xz-devel sqlite-devel tk-devel uuid-devel readline-devel bzip2-devel libffi-devel

[root@kubespray ~]# yum install -y openssl-devel openssl11 openssl11-devel

[root@kubespray ~]# openssl11 version
OpenSSL 1.1.1k  FIPS 25 Mar 2021

1.3.2 安装python 3.10.4

mkdir -p /doc/temp && cd /doc/temp
wget https://www.python.org/ftp/python/3.10.4/Python-3.10.4.tgz

编译主要需要注意的问题是设置编译FLAG，以便使用最新的openssl库。

export CFLAGS=$(pkg-config --cflags openssl11)
export LDFLAGS=$(pkg-config --libs openssl11)

[root@kubespray temp]# echo $CFLAGS
-I/usr/include/openssl11
[root@kubespray temp]# echo $LDFLAGS
-L/usr/lib64/openssl11 -lssl -lcrypto

[root@kubespray temp]# tar xf Python-3.10.4.tgz
[root@kubespray temp]# ls
Python-3.10.4  Python-3.10.4.tgz
[root@kubespray temp]# cd Python-3.10.4/
[root@kubespray Python-3.10.4]#

[root@kubespray Python-3.10.4]# ./configure --enable-optimizations && make altinstall

[root@kubespray Python-3.10.4]# python3.10 --version
Python 3.10.4
[root@kubespray Python-3.10.4]# pip3.10 --version
pip 22.0.4 from /usr/local/lib/python3.10/site-packages/pip (python 3.10)

[root@kubespray Python-3.10.4]# ln -sf /usr/local/bin/python3.10 /usr/bin/python3
[root@kubespray Python-3.10.4]# ln -sf /usr/local/bin/pip3.10  /usr/bin/pip3

[root@kubespray Python-3.10.4]# pip3 install --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple

[root@kubespray Python-3.10.4]# pip3 list
Package    Version
---------- -------
pip        23.1.2
setuptools 58.1.0

1.4 kubespray源文件获取

[root@kubespray ~]# git clone https://github.com/kubernetes-sigs/kubespray.git

[root@kubespray ~]# ls
kubespray 

[root@kubespray ~]# cd kubespray/
[root@kubespray kubespray]# ls
ansible.cfg         CONTRIBUTING.md  inventory  OWNERS_ALIASES             RELEASE.md             roles              setup.py
cluster.yml         Dockerfile       library    pipeline.Dockerfile        remove-node.yml        run.rc             test-infra
CNAME               docs             LICENSE    playbooks                  requirements-2.11.txt  scale.yml          tests
code-of-conduct.md  extra_playbooks  logo       plugins                    requirements-2.12.txt  scripts            upgrade-cluster.yml
_config.yml         galaxy.yml       Makefile   README.md                  requirements.txt       SECURITY_CONTACTS  Vagrantfile
contrib             index.html       OWNERS     recover-control-plane.yml  reset.yml              setup.cfg

1.5 kubespray环境准备

[root@kubespray kubespray]# pip3 install -r requirements.txt

[root@kubespray kubespray]# ansible --version
ansible [core 2.12.5]config file = /root/kubespray/ansible.cfgconfigured module search path = ['/root/kubespray/library']ansible python module location = /usr/local/lib/python3.10/site-packages/ansibleansible collection location = /root/.ansible/collections:/usr/share/ansible/collectionsexecutable location = /usr/local/bin/ansiblepython version = 3.10.4 (main, Apr 27 2023, 10:58:46) [GCC 4.8.5 20150623 (Red Hat 4.8.5-44)]jinja version = 3.1.2libyaml = True

1.6 创建主机清单

[root@kubespray kubespray]# ls inventory/
local  sample
[root@kubespray kubespray]# cp -rfp inventory/sample inventory/mycluster
[root@kubespray kubespray]# ls inventory/
local  mycluster  sample

[root@kubespray kubespray]# declare -a IPS=(192.168.10.160 192.168.10.161 192.168.10.162 192.168.10.163 192.168.10.164)

[root@kubespray kubespray]# ls inventory/mycluster/
group_vars  inventory.ini  patches[root@kubespray kubespray]# CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}DEBUG: Adding group all
DEBUG: Adding group kube_control_plane
DEBUG: Adding group kube_node
DEBUG: Adding group etcd
DEBUG: Adding group k8s_cluster
DEBUG: Adding group calico_rr
DEBUG: adding host node1 to group all
DEBUG: adding host node2 to group all
DEBUG: adding host node3 to group all
DEBUG: adding host node4 to group all
DEBUG: adding host node5 to group all
DEBUG: adding host node1 to group etcd
DEBUG: adding host node2 to group etcd
DEBUG: adding host node3 to group etcd
DEBUG: adding host node1 to group kube_control_plane
DEBUG: adding host node2 to group kube_control_plane
DEBUG: adding host node1 to group kube_node
DEBUG: adding host node2 to group kube_node
DEBUG: adding host node3 to group kube_node
DEBUG: adding host node4 to group kube_node
DEBUG: adding host node5 to group kube_node
[root@kubespray kubespray]# ls inventory/mycluster/
group_vars  hosts.yaml  inventory.ini  patches

[root@kubespray kubespray]# cat inventory/mycluster/hosts.yaml
all:hosts:node1:ansible_host: 192.168.10.160ip: 192.168.10.160access_ip: 192.168.10.160node2:ansible_host: 192.168.10.161ip: 192.168.10.161access_ip: 192.168.10.161node3:ansible_host: 192.168.10.162ip: 192.168.10.162access_ip: 192.168.10.162node4:ansible_host: 192.168.10.163ip: 192.168.10.163access_ip: 192.168.10.163node5:ansible_host: 192.168.10.164ip: 192.168.10.164access_ip: 192.168.10.164children:kube_control_plane:hosts:node1:node2:kube_node:hosts:node1:node2:node3:node4:node5:etcd:hosts:node1:node2:node3:k8s_cluster:children:kube_control_plane:kube_node:calico_rr:hosts: {}修改为：添加了一个master，删除了二个node
[root@kubespray kubespray]# cat inventory/mycluster/hosts.yaml
all:hosts:node1:ansible_host: 192.168.10.160ip: 192.168.10.160access_ip: 192.168.10.160node2:ansible_host: 192.168.10.161ip: 192.168.10.161access_ip: 192.168.10.161node3:ansible_host: 192.168.10.162ip: 192.168.10.162access_ip: 192.168.10.162node4:ansible_host: 192.168.10.163ip: 192.168.10.163access_ip: 192.168.10.163node5:ansible_host: 192.168.10.164ip: 192.168.10.164access_ip: 192.168.10.164children:kube_control_plane:hosts:node1:node2:node3:kube_node:hosts:node4:node5:etcd:hosts:node1:node2:node3:k8s_cluster:children:kube_control_plane:kube_node:calico_rr:hosts: {}

1.7 准备K8S集群配置文件

[root@kubespray kubespray]# cat inventory/mycluster/group_vars/k8s_cluster/k8s-cluster.yml
---
# Kubernetes configuration dirs and system namespace.
# Those are where all the additional config stuff goes
# the kubernetes normally puts in /srv/kubernetes.
# This puts them in a sane location and namespace.
# Editing those values will almost surely break something.
kube_config_dir: /etc/kubernetes
kube_script_dir: "{{ bin_dir }}/kubernetes-scripts"
kube_manifest_dir: "{{ kube_config_dir }}/manifests"# This is where all the cert scripts and certs will be located
kube_cert_dir: "{{ kube_config_dir }}/ssl"# This is where all of the bearer tokens will be stored
kube_token_dir: "{{ kube_config_dir }}/tokens"kube_api_anonymous_auth: true## Change this to use another Kubernetes version, e.g. a current beta release
kube_version: v1.26.3# Where the binaries will be downloaded.
# Note: ensure that you've enough disk space (about 1G)
local_release_dir: "/tmp/releases"
# Random shifts for retrying failed ops like pushing/downloading
retry_stagger: 5# This is the user that owns tha cluster installation.
kube_owner: kube修改：重点观察20、70、76、81、160行等
默认可以不用修改。

1.8 准备k8s集群插件文件

要启用 Kuberenetes 仪表板和入口控制器等插件，请在文件inventory/mycluster/group_vars/k8s_cluster/addons.yml 中将参数设置为已启用：

根据自身业务需要开启对应的服务即可。例如：
[root@kubespray kubespray]# vim inventory/mycluster/group_vars/k8s_cluster/addons.yml
1 ---2 # Kubernetes dashboard3 # RBAC required. see docs/getting-started.md for access details.4 dashboard_enabled: true56 # Helm deployment7 helm_enabled: false89 # Registry deployment10 registry_enabled: false11 # registry_namespace: kube-system12 # registry_storage_class: ""13 # registry_disk_size: "10Gi"1415 # Metrics Server deployment16 metrics_server_enabled: false

1.9 准备ssh密钥

1.9.1 在kubespray主机生成ssh密钥

[root@kubespray ~]# ssh-keygen

1.9.2 使用ssh-copy-id复制ssh密钥到k8s集群节点主机

[root@kubespray ~]# ssh-copy-id root@192.168.10.160
[root@kubespray ~]# ssh-copy-id root@192.168.10.161
[root@kubespray ~]# ssh-copy-id root@192.168.10.162
[root@kubespray ~]# ssh-copy-id root@192.168.10.163
[root@kubespray ~]# ssh-copy-id root@192.168.10.164

1.9.3 在K8S集群节点添加sysops用户指行授权

所有的k8s集群节点

echo "sysops ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/sysops

1.10 k8s集群主机安全设置

[root@kubespray ~]# cd kubespray/

[root@kubespray kubespray]# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "systemctl stop firewalld && systemctl disable firewalld"

1.11 k8s集群主机路由转发设置

[root@kubespray kubespray]# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "echo 'net.ipv4.ip_forward=1' | tee -a /etc/sysctl.conf"

1.12 禁用swap分区

[root@kubespray kubespray]# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab &&  swapoff -a"

二、k8s集群部署及可用性验证

[root@kubespray ~]# cd kubespray/

[root@kubespray kubespray]# ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=root cluster.yml

如果没有执行成功，可以多次执行。

[root@k8s-master01 ~]# kubectl create deployment demo-nginx-kubespray --image=nginx --replicas=2
deployment.apps/demo-nginx-kubespray created[root@k8s-master01 ~]# kubectl get pods
NAME                                   READY   STATUS              RESTARTS   AGE
demo-nginx-kubespray-b65cf84cd-jzkzf   1/1     Running             0          16sdemo-nginx-kubespray-b65cf84cd-v2nv4   0/1     ContainerCreating   0          16s
[root@k8s-master01 ~]# kubectl expose deployment demo-nginx-kubespray --type NodePort --port=80
service/demo-nginx-kubespray exposed[root@k8s-master01 ~]# kubectl get svc
NAME                   TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
demo-nginx-kubespray   NodePort    10.233.7.87   <none>        80:30532/TCP   4s
kubernetes             ClusterIP   10.233.0.1    <none>        443/TCP        16m[root@k8s-master01 ~]# kubectl get  deployments.apps
NAME                   READY   UP-TO-DATE   AVAILABLE   AGE
demo-nginx-kubespray   2/2     2            2           116s[root@k8s-master01 ~]# kubectl get pods
NAME                                   READY   STATUS    RESTARTS   AGE
demo-nginx-kubespray-b65cf84cd-jzkzf   1/1     Running   0          44s
demo-nginx-kubespray-b65cf84cd-v2nv4   1/1     Running   0          44s[root@k8s-master01 ~]# kubectl get svc demo-nginx-kubespray
NAME                   TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
demo-nginx-kubespray   NodePort   10.233.7.87   <none>        80:30532/TCP   17s

三、移除节点

不用修改hosts.yaml文件

[root@kubespray kubespray]# ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=root remove-node.yml -v -b --extra-vars "node=node5"

四、增加节点

需要修改hosts.yaml文件,在inventory/mycluster/hosts.yaml中添加新增节点信息

[root@kubespray kubespray]# cat inventory/mycluster/hosts.yaml
all:hosts:node1:ansible_host: 192.168.10.160ip: 192.168.10.160access_ip: 192.168.10.160node2:ansible_host: 192.168.10.161ip: 192.168.10.161access_ip: 192.168.10.161node3:ansible_host: 192.168.10.162ip: 192.168.10.162access_ip: 192.168.10.162node4:  添加ansible_host: 192.168.10.163ip: 192.168.10.163access_ip: 192.168.10.163node5:  添加ansible_host: 192.168.10.164ip: 192.168.10.164access_ip: 192.168.10.164children:kube_control_plane:hosts:node1:node2:node3:kube_node:hosts:node4:  添加node5:  添加etcd:hosts:node1:node2:node3:k8s_cluster:children:kube_control_plane:kube_node:calico_rr:hosts: {}

[root@kubespray kubespray]# ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=root scale.yml -v -b

五、清理k8s集群

[root@kubespray ~]# cd kubespray/
[root@kubespray kubespray]# ansible-playbook -i inventory/mycluster/hosts.yaml  --become --become-user=root reset.yml

六、修改默认容器镜像仓库

[root@kubespray ~]# cd kubespray/[root@kubespray kubespray]# vim extra_playbooks/roles/download/defaults/main.yml

把第 93行：kube_image_repo: "registry.k8s.io"里面的registry.k8s.io
修改为：registry.aliyuncs.com/google_containers