kubeadm安装k8s

kubernetes

1、k8s实验环境(Vagrant)

• master: 192.168.33.41 CentOS 8.3
• worker01: 192.168.33.42 CentOS 8.3
• worker02: 192.168.33.43 CentOS 8.3

2、修改/etc/hosts

[root@master ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.33.41 master
192.168.33.42 worker01
192.168.33.43 worker02

3、环境准备

##查看centos版本
[root@master vagrant]# cat /etc/redhat-release
CentOS Linux release 8.3.2011
##配置国内yum源
rm -rf /etc/yum.repos.d/*.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
##刷新缓存
yum makecache
##安装基础软件
yum install wget expect vim net-tools  bash-completion ipvsadm ipset jq iptables conntrack sysstat libseccomp -y
##关闭防火墙
sed -ri 's#(SELINUX=).*#\1disabled#' /etc/selinux/config
echo 'KUBELET_EXTRA_ARGS="--fail-swap-on=false"' > /etc/sysconfig/kubelet
setenforce 0
systemctl disable firewalld
systemctl stop firewalld
##关闭swap
swapoff -a
sed -i '/swap/s/^\(.*\)$/#\1/g' /etc/fstab
##安装ipvs
yum install -y conntrack-tools ipvsadm ipset conntrack libseccomp
# 加载IPVS模块
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_fo ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack"
for kernel_module in \${ipvs_modules}; do
  /sbin/modinfo -F filename \${kernel_module} > /dev/null 2>&1
  if [ $? -eq 0 ]; then
    /sbin/modprobe \${kernel_module}
  fi
done
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs
##内核参数优化
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp.keepaliv.probes = 3
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp.max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp.max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.top_timestamps = 0
net.core.somaxconn = 16384
EOF
# 立即生效
sysctl --system 
## 安装docker
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum install docker-ce -y
##修改cgroupdriver为systemd
vim /usr/lib/systemd/system/docker.service
ExecStart后追加--exec-opt native.cgroupdriver=systemd
systemctl daemon-reload 
systemctl restart docker
systemctl enable --now docker.service 

安装4、kubenetes

##配置kubenetes yum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
setenforce 0
dnf install -y iproute-tc
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet
##查看kubeadm版本号
[root@master vagrant]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.3", GitCommit:"c92036820499fedefec0f847e2054d824aea6cd1", GitTreeState:"clean", BuildDate:"2021-10-27T18:40:11Z", GoVersion:"go1.16.9", Compiler:"gc", Platform:"linux/amd64"}
# 初始化(master)
kubeadm init \
--kubernetes-version=v1.22.3 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16 \
--apiserver-advertise-address=192.168.33.100 \
--control-plane-endpoint=192.168.33.100:8443 \
--upload-certs
## 配置kubectl(master)
To start using your cluster, you need to run the following as a regular user:
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
  export KUBECONFIG=/etc/kubernetes/admin.conf
## 安装flannel插件(master)
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
## 修改yaml文件(https://github.com/kubernetes/kubeadm/issues/1056)
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
- --iface=eth1  新增这一行
kubectl apply -f kube-flannel.yml
## worker节点加入k8s集群
kubeadm join 192.168.33.41:6443 --token blnavp.k92c6amfxxa8g0uw \
    --discovery-token-ca-cert-hash sha256:6d5edb63eb63951800bffd44ed1189076f3935664d7f007501fc82e269d12ee8

5、高可用集群部署(3个master)

1、部署etcd集群: https://blog.csdn.net/lswzw/article/details/109027255
2、多master部署: https://jishuin.proginn.com/p/763bfbd2e84c