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基于kubeasz高可用集群部署

岁月不饶人老不正经 2022-04-17 阅读 144
kubernetes

集群节点规划
在这里插入图片描述

#系统yum替换
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
#添加Kubernetes 镜像源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

关闭selinunx

## 临时并永久关闭SELinux
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

关闭交换分区

swapoff -a &&  sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

免密

ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.put <romte_ip>

安装keepalived

yum install keepalived -y
cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}


vrrp_instance VI_1 {
    state MASTER
    interface ens33
    garp_master_delay 10
    smtp_alert
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.74.241 label ens33:0
        192.168.74.242 label ens33:1
        192.168.74.243 label ens33:2

	# optional label. should be of the form "realdev:sometext" for
	# compatibility with ifconfig.
	# 192.168.200.18 label eth0:1
    }
}

安装haproxy

yum install haproxy -y

echo <<EOF >>/etc/keepalived/keepalived.conf

listen k8s_api_nodes_6443
    bind 192.168.74.241:6443
    mode tcp
    server 192.168.74.144 192.168.74.144:6443 check inter 2000 fall 3 rise 5
    server 192.168.74.145 192.168.74.145:6443 check inter 2000 fall 3 rise 5
    server 192.168.74.146 192.168.74.146:6443 check inter 2000 fall 3 rise 5
EOF

安装ansible

curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py
python get-pip.py
pip install ansible -i https://mirrors.aliyun.com/pypi/simple/

获取kubeasz

export release=3.0.0
wget https://github.com/easzlab/kubeasz/releases/download/${release}/ezdown
chmod +x ./ezdown
#获取k8s基础包
./ezdown -D
#获取二进制文件
./ezdown -P

创建建集群并配置
获取kubeasz

ezctl new k8s-cluster1
vim clusters/k8s-cluster1/hosts

#hosts内容
# 'etcd' cluster should have odd member(s) (1,3,5,...)
[etcd]
192.168.74.144
192.168.74.145
192.168.74.146

# master node(s)
[kube_master]
192.168.74.144
192.168.74.145
192.168.74.146

# work node(s)
[kube_node]
192.168.74.147
192.168.74.148

# [optional] harbor server, a private docker registry
# 'NEW_INSTALL': 'true' to install a harbor server; 'false' to integrate with existed one
[harbor]
#192.168.1.8 NEW_INSTALL=false

# [optional] loadbalance for accessing k8s from outside
[ex_lb]
192.168.1.6 LB_ROLE=backup EX_APISERVER_VIP=192.168.74.241 EX_APISERVER_PORT=8443
192.168.1.7 LB_ROLE=master EX_APISERVER_VIP=192.168.74.241 EX_APISERVER_PORT=8443

# [optional] ntp server for the cluster
[chrony]
#192.168.1.1

[all:vars]
# --------- Main Variables ---------------
# Secure port for apiservers
SECURE_PORT="6443"

# Cluster container-runtime supported: docker, containerd
CONTAINER_RUNTIME="docker"

# Network plugins supported: calico, flannel, kube-router, cilium, kube-ovn
CLUSTER_NETWORK="calico"

# Service proxy mode of kube-proxy: 'iptables' or 'ipvs'
PROXY_MODE="ipvs"

# K8S Service CIDR, not overlap with node(host) networking
SERVICE_CIDR="10.100.0.0/16"

# Cluster CIDR (Pod CIDR), not overlap with node(host) networking
CLUSTER_CIDR="10.200.0.0/16"

# NodePort Range
NODE_PORT_RANGE="30000-62767"

# Cluster DNS Domain
CLUSTER_DNS_DOMAIN="kubedocker.local"

# -------- Additional Variables (don't change the default value right now) ---
# Binaries Directory
bin_dir="/usr/local/bin"

# Deploy Directory (kubeasz workspace)
base_dir="/etc/kubeasz"

# Directory for a specific cluster
cluster_dir="{{ base_dir }}/clusters/k8s-cluster1"

# CA and other components cert/key Directory
ca_dir="/etc/kubernetes/ssl"


vim clusters/k8s-cluster1/config.yml



############################
# prepare
############################
# 可选离线安装系统软件包 (offline|online)
INSTALL_SOURCE: "online"

# 可选进行系统安全加固 github.com/dev-sec/ansible-collection-hardening
OS_HARDEN: false

# 设置时间源服务器【重要：集群内机器时间必须同步】
ntp_servers:
  - "ntp1.aliyun.com"
  - "time1.cloud.tencent.com"
  - "0.cn.pool.ntp.org"

# 设置允许内部时间同步的网络段，比如"10.0.0.0/8"，默认全部允许
local_network: "0.0.0.0/0"


############################
# role:deploy
############################
# default: ca will expire in 100 years
# default: certs issued by the ca will expire in 50 years
CA_EXPIRY: "876000h"
CERT_EXPIRY: "438000h"

# kubeconfig 配置参数
CLUSTER_NAME: "cluster1"
CONTEXT_NAME: "context-{{ CLUSTER_NAME }}"

# k8s version
K8S_VER: "1.23.1"

############################
# role:etcd
############################
# 设置不同的wal目录，可以避免磁盘io竞争，提高性能
ETCD_DATA_DIR: "/var/lib/etcd"
ETCD_WAL_DIR: ""


############################
# role:runtime [containerd,docker]
############################
# ------------------------------------------- containerd
# [.]启用容器仓库镜像
ENABLE_MIRROR_REGISTRY: true

# [containerd]基础容器镜像
SANDBOX_IMAGE: "easzlab/pause:3.6"

# [containerd]容器持久化存储目录
CONTAINERD_STORAGE_DIR: "/var/lib/containerd"

# ------------------------------------------- docker
# [docker]容器存储目录
DOCKER_STORAGE_DIR: "/var/lib/docker"

# [docker]开启Restful API
ENABLE_REMOTE_API: false

# [docker]信任的HTTP仓库
INSECURE_REG: '["127.0.0.1/8","192.0.0.1/8"]'


############################
# role:kube-master
############################
# k8s 集群 master 节点证书配置，可以添加多个ip和域名（比如增加公网ip和域名）
MASTER_CERT_HOSTS:
  - "192.168.74.241"
  - "k8s.test.io"
  #- "www.test.com"

# node 节点上 pod 网段掩码长度（决定每个节点最多能分配的pod ip地址）
# 如果flannel 使用 --kube-subnet-mgr 参数，那么它将读取该设置为每个节点分配pod网段
# https://github.com/coreos/flannel/issues/847
NODE_CIDR_LEN: 24


############################
# role:kube-node
############################
# Kubelet 根目录
KUBELET_ROOT_DIR: "/var/lib/kubelet"

# node节点最大pod 数
MAX_PODS: 110

# 配置为kube组件（kubelet,kube-proxy,dockerd等）预留的资源量
# 数值设置详见templates/kubelet-config.yaml.j2
KUBE_RESERVED_ENABLED: "no"

# k8s 官方不建议草率开启 system-reserved, 除非你基于长期监控，了解系统的资源占用状况；
# 并且随着系统运行时间，需要适当增加资源预留，数值设置详见templates/kubelet-config.yaml.j2
# 系统预留设置基于 4c/8g 虚机，最小化安装系统服务，如果使用高性能物理机可以适当增加预留
# 另外，集群安装时候apiserver等资源占用会短时较大，建议至少预留1g内存
SYS_RESERVED_ENABLED: "no"

# haproxy balance mode
BALANCE_ALG: "roundrobin"


############################
# role:network [flannel,calico,cilium,kube-ovn,kube-router]
############################
# ------------------------------------------- flannel
# [flannel]设置flannel 后端"host-gw","vxlan"等
FLANNEL_BACKEND: "vxlan"
DIRECT_ROUTING: false

# [flannel] flanneld_image: "quay.io/coreos/flannel:v0.10.0-amd64"
flannelVer: "v0.15.1"
flanneld_image: "easzlab/flannel:{{ flannelVer }}"

# [flannel]离线镜像tar包
flannel_offline: "flannel_{{ flannelVer }}.tar"

# ------------------------------------------- calico
# [calico]设置 CALICO_IPV4POOL_IPIP=“off”,可以提高网络性能，条件限制详见 docs/setup/calico.md
CALICO_IPV4POOL_IPIP: "Always"

# [calico]设置 calico-node使用的host IP，bgp邻居通过该地址建立，可手工指定也可以自动发现
IP_AUTODETECTION_METHOD: "can-reach={{ groups['kube_master'][0] }}"

# [calico]设置calico 网络 backend: brid, vxlan, none
CALICO_NETWORKING_BACKEND: "brid"

# [calico]更新支持calico 版本: [v3.3.x] [v3.4.x] [v3.8.x] [v3.15.x]
calico_ver: "v3.19.3"

# [calico]calico 主版本
calico_ver_main: "{{ calico_ver.split('.')[0] }}.{{ calico_ver.split('.')[1] }}"

# [calico]离线镜像tar包
calico_offline: "calico_{{ calico_ver }}.tar"

# ------------------------------------------- cilium
# [cilium]CILIUM_ETCD_OPERATOR 创建的 etcd 集群节点数 1,3,5,7...
ETCD_CLUSTER_SIZE: 1

# [cilium]镜像版本
cilium_ver: "v1.4.1"

# [cilium]离线镜像tar包
cilium_offline: "cilium_{{ cilium_ver }}.tar"

# ------------------------------------------- kube-ovn
# [kube-ovn]选择 OVN DB and OVN Control Plane 节点，默认为第一个master节点
OVN_DB_NODE: "{{ groups['kube_master'][0] }}"

# [kube-ovn]离线镜像tar包
kube_ovn_ver: "v1.5.3"
kube_ovn_offline: "kube_ovn_{{ kube_ovn_ver }}.tar"

# ------------------------------------------- kube-router
# [kube-router]公有云上存在限制，一般需要始终开启 ipinip；自有环境可以设置为 "subnet"
OVERLAY_TYPE: "full"

# [kube-router]NetworkPolicy 支持开关
FIREWALL_ENABLE: "true"

# [kube-router]kube-router 镜像版本
kube_router_ver: "v0.3.1"
busybox_ver: "1.28.4"

# [kube-router]kube-router 离线镜像tar包
kuberouter_offline: "kube-router_{{ kube_router_ver }}.tar"
busybox_offline: "busybox_{{ busybox_ver }}.tar"


############################
# role:cluster-addon
############################
# coredns 自动安装
dns_install: "yes"
corednsVer: "1.8.6"
ENABLE_LOCAL_DNS_CACHE: false
dnsNodeCacheVer: "1.21.1"
# 设置 local dns cache 地址
LOCAL_DNS_CACHE: "169.254.20.10"

# metric server 自动安装
metricsserver_install: "no"
metricsVer: "v0.5.2"

# dashboard 自动安装
dashboard_install: "no"
dashboardVer: "v2.4.0"
dashboardMetricsScraperVer: "v1.0.7"

# ingress 自动安装
ingress_install: "no"
ingress_backend: "traefik"
traefik_chart_ver: "10.3.0"

# prometheus 自动安装
prom_install: "no"
prom_namespace: "monitor"
prom_chart_ver: "12.10.6"

# nfs-provisioner 自动安装
nfs_provisioner_install: "no"
nfs_provisioner_namespace: "kube-system"
nfs_provisioner_ver: "v4.0.2"
nfs_storage_class: "managed-nfs-storage"
nfs_server: "192.168.1.10"
nfs_path: "/data/nfs"

############################
# role:harbor
############################
# harbor version，完整版本号
HARBOR_VER: "v2.1.3"
HARBOR_DOMAIN: "harbor.yourdomain.com"
HARBOR_TLS_PORT: 8443

# if set 'false', you need to put certs named harbor.pem and harbor-key.pem in directory 'down'
HARBOR_SELF_SIGNED_CERT: true

# install extra component
HARBOR_WITH_NOTARY: false
HARBOR_WITH_TRIVY: false
HARBOR_WITH_CLAIR: false
HARBOR_WITH_CHARTMUSEUM: true

安装集群

./ezctl setup k8s-cluster1 01
./ezctl setup k8s-cluster1 02
./ezctl setup k8s-cluster1 03
./ezctl setup k8s-cluster1 04
./ezctl setup k8s-cluster1 05
./ezctl setup k8s-cluster1 06

验证安装

kubectl version 
Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.1", GitCommit:"86ec240af8cbd1b60bcc4c03c20da9b98005b92e", GitTreeState:"clean", BuildDate:"2021-12-16T11:41:01Z", GoVersion:"go1.17.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.1", GitCommit:"86ec240af8cbd1b60bcc4c03c20da9b98005b92e", GitTreeState:"clean", BuildDate:"2021-12-16T11:34:54Z", GoVersion:"go1.17.5", Compiler:"gc", Platform:"linux/amd64"}


kubectl get node
NAME             STATUS                     ROLES    AGE   VERSION
192.168.74.144   Ready,SchedulingDisabled   master   30m   v1.23.1
192.168.74.145   Ready,SchedulingDisabled   master   30m   v1.23.1
192.168.74.146   Ready,SchedulingDisabled   master   30m   v1.23.1
192.168.74.147   Ready                      node     21m   v1.23.1
192.168.74.148   Ready                      node     21m   v1.23.1

get pod -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-754966f84c-v7sdp   1/1     Running   0          7m11s
kube-system   calico-node-dqsfg                          1/1     Running   0          7m11s
kube-system   calico-node-lkkrs                          1/1     Running   0          7m11s
kube-system   calico-node-pdgwz                          1/1     Running   0          7m11s
kube-system   calico-node-wfgn5                          1/1     Running   0          7m11s
kube-system   calico-node-wz9cr                          1/1     Running   0          7m11s
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