Kubernetes1.26.0部署(Ubuntu/CentOS)
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文章目录
前言
- v1.24.0 - v1.26.0 之前支持docker但是需要额外安装cri-docker来充当垫片
- 截至作者更新目前v1.26.0暂时不支持docker方式因此本次采用containerd
- 由于工作原因作者会同时使用Ubuntu和CentOS因此本次将两个系统的K8S安装一起记录一下
- 使用kubeadm部署3主2从高可用集群
- etcd采用二进制部署复用3个管理节点
- 本次部署无vip采用nginx做负载均衡
理想拓扑图如下
准备工作
准备5台虚拟机
虚拟机建议同时使用相同操作系统并配置好正确的IP地址
初始化操作
大部分步骤只需要在管理节点1操作
记录一下规划的配置文件避免后面写错
cat <<EOF > /opt/k8s_env.sh
#!/bin/bash
# k8s节点网段,方便做chronyd对时
NODEIPS=192.168.3.0/24
# k8s集群所有节点
HOSTS=(master1 master2 master3 node1 node2)
# k8s管理节点
MASTERS=(master1 master2 master3)
# k8s工作节点
WORKS=(master1 master2 master3 node1 node2)
# 每个节点对应的IP地址
master1=192.168.3.201
master2=192.168.3.202
master3=192.168.3.203
node1=192.168.3.204
node2=192.168.3.205
# 节点root密码方便脚本自动免密
export SSHPASS=1
# 配置kubectl自动补全
#source <(kubeadm completion bash)
#source <(kubectl completion bash)
#source <(crictl completion bash)
# 服务网段(Service CIDR)部署前路由不可达部署后集群内部使用IP:Port可达
SERVICE_CIDR="10.100.0.0/16"
# Pod 网段(Cluster CIDR)部署前路由不可达部署后路由可达(flanneld 保证)
CLUSTER_CIDR="172.31.0.0/16"
# 服务端口范围(NodePort Range)
NODE_PORT_RANGE="30000-40000"
# etcd集群服务地址列表(默认复用3个master节点)
ETCD_ENDPOINTS="https://\$master1:2379,https://\$master2:2379,https://\$master3:2379"
# etcd集群服务地址列表(默认复用3个master节点)
ETCD_CLUSTERS="master1=https://\$master1:2380,master2=https://\$master2:2380,master3=https://\$master3:2380"
EOF
Centos
配置yum源
- 配置基础yum源为阿里源(后续安装基础软件包)
mkdir /opt/yum_bak && mv /etc/yum.repos.d/* /opt/yum_bak/ # 备份原有的repo
curl -o /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo
yum -y install epel-release
sed -i "s/#baseurl/baseurl/g" /etc/yum.repos.d/epel.repo
sed -i "s/metalink/#metalink/g" /etc/yum.repos.d/epel.repo
sed -i "s@https\?://download.fedoraproject.org/pub@https://repo.huaweicloud.com@g" /etc/yum.repos.d/epel.repo
# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
# curl -o /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo
# 阿里貌似限速了最近用阿里的源老慢了
- 添加启用源(后续更新内核)
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm -y
sed -i "s@mirrorlist@#mirrorlist@g" /etc/yum.repos.d/elrepo.repo
sed -i "s@elrepo.org/linux@mirrors.tuna.tsinghua.edu.cn/elrepo@g" /etc/yum.repos.d/elrepo.repo
- 添加docker源(用于安装containerd)
yum install -y yum-utils device-mapper-persistent-data lvm2
curl -o /etc/yum.repos.d/docker-ce.repo https://repo.huaweicloud.com/docker-ce/linux/centos/docker-ce.repo
# Step 3
sed -i 's+download.docker.com+repo.huaweicloud.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
- 添加k8s源(用于安装kubeadm、kubelet、kubectl)
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://repo.huaweicloud.com/kubernetes/yum/repos/kubernetes-el7-$basearch
enabled=1
gpgcheck=10
repo_gpgcheck=0
gpgkey=https://repo.huaweicloud.com/kubernetes/yum/doc/yum-key.gpg https://repo.huaweicloud.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 提示 若您使用的yum中变量 $basearch 无法解析, 请把第二步配置文件中的$basearch修改为相应系统架构(aarch64/armhfp/ppc64le/s390x/x86_64).
- 建立yum缓存
yum clean all && yum makecache fast
配置免密、修改hostname、关闭防火墙、selinux、关闭swap分区(方便后面进行其它操作)
- 修改hosts文件
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do echo "$(eval echo "$"$host) $host" >> /etc/hosts;done
# 执行本命令之前记得先修改配置文件/opt/k8s_env.sh
- 修改hostname、关闭防火墙、selinux、关闭swap分区
source /opt/k8s_env.sh
yum -y install sshpass
ssh-keygen -t rsa -b 2048 -P "" -f /root/.ssh/id_rsa -q
for host in ${HOSTS[@]};do
#sshpass -p 1 ssh-copy-id -o StrictHostKeyChecking=no $host
sshpass -e ssh-copy-id -o StrictHostKeyChecking=no $host
ssh $host "hostnamectl set-hostname $host"
ssh $host "systemctl disable --now firewalld"
ssh $host "setenforce 0"
ssh $host "sed -ri '/^SELINUX=/cSELINUX=disabled' /etc/selinux/config"
ssh $host "sed -i 's@.*swap.*@#&@g' /etc/fstab"
ssh $host "swapoff -a"
scp /etc/hosts $host:/etc/hosts
done
下载软件包并批量安装
- 下载软件包至/opt/rpm_dir方便后续一起安装
yumdownloader --resolve --destdir /opt/rpm_dir wget psmisc vim net-tools nfs-utils telnet yum-utils device-mapper-persistent-data lvm2 git tar curl ipvsadm ipset sysstat conntrack libseccomp chrony
# 常用基础软件包
yumdownloader --resolve --destdir /opt/rpm_dir kernel-ml --enablerepo=elrepo-kernel
# 新版本ml内核软件包
yumdownloader --resolve --destdir /opt/rpm_dir containerd.io --disableexcludes=docker-ce
# containerd软件包
yumdownloader --resolve --destdir /opt/rpm_dir kubelet-1.26.0-0 kubectl-1.26.0-0 kubeadm-1.26.0-0 --disableexcludes=kubernetes
# 1.26.0的kubelet、kubectl、kubeadm软件包
- 所有节点都安装以上软件包
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
scp /etc/yum.repos.d/*.repo $host:/etc/yum.repos.d/
scp -r /opt/rpm_dir $host:/tmp/
ssh $host "yum -y localinstall /tmp/rpm_dir/*"
ssh $host "rm -rf /tmp/rpm_dir/"
#ssh $host "echo 'export LC_ALL=en_US.UTF-8' >> ~/.bashrc"
# 如果习惯中文可以将这句的注释去掉
done
- 升级内核(节点会重启)
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $host "rpm -qa|grep kernel"
#ssh $host " awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg"
echo $host
echo ""
ssh $host "grub2-set-default 0"
done
for host in ${HOSTS[@]};do
if [[ $host == $(hostname) ]];then
continue
fi
ssh $host reboot
done
init 6
配置时间同步
计划master1同步阿里ntp服务器其余节点同步master1
cat > /etc/chrony.conf <<EOF
server ntp.aliyun.com iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow $NODEIPS
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
cat > /opt/chrony.conf <<EOF
server $master1 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
分发chrony配置文件
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $host "ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime"
if [[ $host == $(hostname) ]];then
ssh $host "systemctl restart chronyd"
continue
fi
scp /opt/chrony.conf $host:/etc/chrony.conf
ssh $host " systemctl restart chronyd"
done
sleep 3
for host in ${HOSTS[@]};do
ssh $host "timedatectl"
ssh $host "chronyc sources -v"
done
配置打开文件描述符
cat <<EOF > /etc/security/limits.conf
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
scp /etc/security/limits.conf $host:/etc/security/limits.conf
done
添加ipvs模块和内核模块
- 添加ipvs模块
cat <<EOF > /etc/modules-load.d/ipvs.conf
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
ip_vs_sh
nf_conntrack #内核小于4.18把这行改成nf_conntrack_ipv4
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
overlay
br_netfilter
EOF
- 添加内核模块
cat <<EOF > /etc/sysctl.d/k8s.conf
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.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_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.tcp_timestamps = 0
net.core.somaxconn = 16384
vm.swappiness=0
EOF
- 进行配置文件分发
source /opt/k8s_env.sh
for host in ${WORKS[@]};do
scp /etc/modules-load.d/ipvs.conf $host:/etc/modules-load.d/ipvs.conf
scp /etc/sysctl.d/k8s.conf $host:/etc/sysctl.d/k8s.conf
ssh $host "systemctl restart systemd-modules-load.service"
ssh $host "sysctl --system"
done
Ubuntu
配置apt源
- 基础apt源
mv /etc/apt/{sources.list,sources.list.bak} # 备份现有的apt源
cat <<EOF > /etc/apt/sources.list
deb http://repo.huaweicloud.com/ubuntu focal main restricted
deb http://repo.huaweicloud.com/ubuntu focal-updates main restricted
deb http://repo.huaweicloud.com/ubuntu focal universe
deb http://repo.huaweicloud.com/ubuntu focal-updates universe
deb http://repo.huaweicloud.com/ubuntu focal multiverse
deb http://repo.huaweicloud.com/ubuntu focal-updates multiverse
deb http://repo.huaweicloud.com/ubuntu focal-backports main restricted universe multiverse
deb http://repo.huaweicloud.com/ubuntu focal-security main restricted
deb http://repo.huaweicloud.com/ubuntu focal-security universe
deb http://repo.huaweicloud.com/ubuntu focal-security multiverse
EOF
sudo apt-get update
- 添加docker源(用于安装containerd)
curl -fsSL https://repo.huaweicloud.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://repo.huaweicloud.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
- 添加k8s源(用于安装kubeadm、kubelet、kubectl)
cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb https://repo.huaweicloud.com/kubernetes/apt/ kubernetes-xenial main
EOF
curl -s https://repo.huaweicloud.com/kubernetes/apt/doc/apt-key.gpg | sudo apt-key add -
配置免密、修改hostname、关闭防火墙、关闭swap分区(方便后面进行其它操作)
- 修改hosts文件
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do echo "$(eval echo "$"$host) $host" >> /etc/hosts;done
# 执行本命令之前记得先修改配置文件/opt/k8s_env.sh
- 修改hostname、关闭防火墙、关闭swap分区
source /opt/k8s_env.sh
apt -y install sshpass
ssh-keygen -t rsa -b 2048 -P "" -f /root/.ssh/id_rsa -q
for host in ${HOSTS[@]};do
#sshpass -p 1 ssh-copy-id -o StrictHostKeyChecking=no $host
sshpass -e ssh-copy-id -o StrictHostKeyChecking=no $host
ssh $host "hostnamectl set-hostname $host"
ssh $host "systemctl disable --now ufw"
ssh $host "sed -i 's@.*swap.*@#&@g' /etc/fstab"
ssh $host "swapoff -a"
scp /etc/hosts $host:/etc/hosts
done
下载软件包并批量安装
- 本来想下载软件包然后一起dpkg安装的但是总是少安装包就还是直接安装了
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $host "apt -y install net-tools ipvsadm ipset conntrack chrony "
ssh $host "apt -y install kubelet=1.26.0-00 kubeadm=1.26.0-00 kubectl=1.26.0-00"
ssh $host "apt -y install containerd.io"
done
配置时间同步
计划master1同步阿里ntp服务器其余节点同步master1
cat > /etc/chrony/chrony.conf <<EOF
server ntp.aliyun.com iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow $NODEIPS
local stratum 10
keyfile /etc/chrony/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
cat > /opt/chrony.conf <<EOF
server $master1 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
local stratum 10
keyfile /etc/chrony/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
分发chrony配置文件
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $host "ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime"
if [[ $host == $(hostname) ]];then
ssh $host "systemctl restart chrony"
continue
fi
scp /opt/chrony.conf $host:/etc/chrony/chrony.conf
ssh $host " systemctl restart chrony"
done
sleep 3
for host in ${HOSTS[@]};do
ssh $host "systemctl enable chrony"
ssh $host "timedatectl"
ssh $host "chronyc sources -v"
done
配置打开文件描述符
cat <<EOF > /etc/security/limits.conf
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
scp /etc/security/limits.conf $host:/etc/security/limits.conf
done
添加ipvs模块和内核模块
- 添加ipvs模块
cat <<EOF > /etc/modules-load.d/ipvs.conf
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
ip_vs_sh
nf_conntrack #内核小于4.18把这行改成nf_conntrack_ipv4
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
overlay
br_netfilter
EOF
- 添加内核模块
cat <<EOF > /etc/sysctl.d/k8s.conf
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.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_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.tcp_timestamps = 0
net.core.somaxconn = 16384
vm.swappiness=0
EOF
- 进行配置文件分发
source /opt/k8s_env.sh
for host in ${WORKS[@]};do
scp /etc/modules-load.d/ipvs.conf $host:/etc/modules-load.d/ipvs.conf
scp /etc/sysctl.d/k8s.conf $host:/etc/sysctl.d/k8s.conf
ssh $host "systemctl restart systemd-modules-load.service"
ssh $host "sysctl --system"
done
编译一个nginx做负载均衡
如果不想编译的话也可以直接yum/apt安装nginx但是需要额外安装模块
CentOS
yum -y install nginx
yum -y install nginx-all-modules.noarch
Ubuntu
apt -y install nginx
- 安装编译需要的软件
CentOS
yum -y install gcc gcc-c++ //C语言环境
yum -y install pcre pcre-devel //正则
yum -y install zlib zlib-devel //lib包
yum -y install openssl openssl-devel make
Ubuntu
apt-get install gcc
apt-get install libpcre3 libpcre3-dev
apt-get install zlib1g zlib1g-dev
apt-get install make
- 下载源码包
wget http://nginx.org/download/nginx-1.20.1.tar.gz
tar -xf nginx-1.20.1.tar.gz
cd nginx-1.20.1/
- 编译部署nginx
./configure --prefix=/opt --with-stream --without-http --without-http_uwsgi_module && \
make && \
make install
- 编写nginx配置文件
cat > /opt/nginx.conf <<EOF
worker_processes auto;
events {
worker_connections 1024;
}
stream {
upstream backend {
hash \$remote_addr consistent;
server $master1:6443 max_fails=3 fail_timeout=30s;
server $master2:6443 max_fails=3 fail_timeout=30s;
server $master3:6443 max_fails=3 fail_timeout=30s;
}
server {
listen *:8443;
proxy_connect_timeout 1s;
proxy_pass backend;
}
}
EOF
- 编写nginx的service文件
cat > /opt/kube-nginx.service <<EOF
[Unit]
Description=kube-apiserver nginx proxy
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=forking
ExecStartPre=/usr/local/bin/nginx -c /etc/nginx/nginx.conf -p /etc/nginx -t
ExecStart=/usr/local/bin/nginx -c /etc/nginx/nginx.conf -p /etc/nginx
ExecReload=/usr/local/bin/nginx -c /etc/nginx/nginx.conf -p /etc/nginx -s reload
PrivateTmp=true
Restart=always
RestartSec=5
StartLimitInterval=0
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
- 分发文件并启动nginx
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $host "mkdir /etc/nginx/logs -p"
scp /opt/sbin/nginx $host:/usr/local/bin/
scp /opt/nginx.conf $host:/etc/nginx/nginx.conf
scp /opt/kube-nginx.service $host:/etc/systemd/system/
ssh $host "systemctl daemon-reload "
ssh $host "systemctl enable kube-nginx"
ssh $host "systemctl restart kube-nginx"
done
二进制安装etcd
- 下载二进制包
wget https://ghproxy.com/https://github.com/etcd-io/etcd/releases/download/v3.4.23/etcd-v3.4.23-linux-amd64.tar.gz
tar -xf etcd-v3.4.23-linux-amd64.tar.gz
- 准备etcd的service文件
cat <<EOF > etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd \\
--name=##NODE_NAME## \\
--cert-file=/etc/etcd/ssl/etcd.pem \\
--key-file=/etc/etcd/ssl/etcd-key.pem \\
--peer-cert-file=/etc/etcd/ssl/etcd.pem \\
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \\
--trusted-ca-file=/etc/etcd/ssl/ca.pem \\
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \\
--initial-advertise-peer-urls=https://##NODE_IP##:2380 \\
--listen-peer-urls=https://##NODE_IP##:2380 \\
--listen-client-urls=https://##NODE_IP##:2379,http://127.0.0.1:2379 \\
--advertise-client-urls=https://##NODE_IP##:2379 \\
--initial-cluster-token=etcd-cluster \\
--initial-cluster=##ETCD_CLUSTERS## \\
--initial-cluster-state=new \\
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
准备etcd所需证书
- 下载cfssl工具制作证书
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 && mv cfssl_linux-amd64 /usr/local/bin/cfssl
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 && mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 && mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfsslinfo
- 创建根证书配置
mkdir pki
cd !$
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"etcd": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
EOF
- 创建ca证书请求文件
cat > ca-csr.json <<EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "HuBei",
"L": "WuHan",
"O": "etcd",
"OU": "etcd"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
- 创建etcd证书请求文件
cat <<EOF > etcd-csr.json
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"$master1",
"$master2",
"$master3"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "HuBei",
"L": "WuHan",
"O": "etcd",
"OU": "etcd"
}
]
}
EOF
- 初始化ca证书利用生成的根证书生成etcd证书文件
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=etcd etcd-csr.json |cfssljson -bare etcd
分发证书、二进制文件及service文件
source /opt/k8s_env.sh
for host in ${MASTERS[@]};do
ssh $host "mkdir /etc/etcd/ssl/ -p"
ssh $host "mkdir /var/lib/etcd"
scp /opt/pki/etcd* $host:/etc/etcd/ssl/
scp /opt/pki/ca* $host:/etc/etcd/ssl/
done
for host in ${MASTERS[@]};do
IP=$(eval echo "$"$host)
sed -e "s@##NODE_NAME##@$host@g" -e "s@##NODE_IP##@$IP@g" -e "s@##ETCD_CLUSTERS##@$ETCD_CLUSTERS@g" etcd.service > etcd.service.$host
scp etcd.service.$host $host:/etc/systemd/system/etcd.service
scp /opt/etcd-v3.4.23-linux-amd64/etcd* $host:/usr/local/bin/
ssh $host "systemctl daemon-reload"
ssh $host "systemctl enable etcd"
ssh $host "systemctl restart etcd"
done
检查etcd是否正常
ETCDCTL_API=3 etcdctl --endpoints=$ETCD_ENDPOINTS --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem endpoint status --write-out=table
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://10.10.21.232:2379 | 60e9bfc3d268a8a9 | 3.4.23 | 20 kB | true | false | 12 | 27 | 27 | |
| https://10.10.21.233:2379 | c3f9a83d12a6d10d | 3.4.23 | 20 kB | false | false | 12 | 27 | 27 | |
| https://10.10.21.234:2379 | 1d0903088fe311d1 | 3.4.23 | 20 kB | false | false | 12 | 27 | 27 | |
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
配置containerd
下载crictl二进制文件
wget https://ghproxy.com/https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.26.0/crictl-v1.26.0-linux-amd64.tar.gz
tar -xf crictl-v1.26.0-linux-amd64.tar.gz
cat > /etc/crictl.yaml <<EOF
runtime-endpoint: "unix:///run/containerd/containerd.sock"
image-endpoint: "unix:///run/containerd/containerd.sock"
timeout: 10 #超时时间不宜过短我这里修改成10秒了
debug: false
pull-image-on-create: false
disable-pull-on-run: false
EOF
分发配置文件及crictl二进制文件
for host in ${WORKS[@]};do
ssh $host "containerd config default | tee /etc/containerd/config.toml"
ssh $host 'sed -i "s@systemd_cgroup\ \=\ false@systemd_cgroup\ \=\ true@g" /etc/containerd/config.toml'
ssh $host 'sed -i "s@registry.k8s.io@registry.aliyuncs.com/google_containers@g" /etc/containerd/config.toml'
ssh $host 'sed -i "s@runtime_type.*@runtime_type\ \=\ \"io.containerd.runtime.v1.linux\"@g" /etc/containerd/config.toml'
scp crictl $host:/usr/local/bin/crictl
scp /etc/crictl.yaml $host:/etc/crictl.yaml
ssh $host "systemctl daemon-reload"
ssh $host "systemctl enable containerd"
ssh $host "systemctl restart containerd"
done
kubeadm初始化集群
编写init文件
cat <<EOF > kubeadm_init.yaml
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: abcdef.0123456789abcdef
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: ##master1##
bindPort: 6443
nodeRegistration:
criSocket: unix:///var/run/containerd/containerd.sock
imagePullPolicy: IfNotPresent
name: $(hostname)
taints: null
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns: {}
etcd:
external: #这里默认是local由于我们用的外部etcd所以需要修改
endpoints:
- https://$master1:2379
- https://$master2:2379
- https://$master3:2379
#搭建etcd集群时生成的ca证书
caFile: /etc/etcd/ssl/ca.pem
#搭建etcd集群时生成的客户端证书
certFile: /etc/etcd/ssl/etcd.pem
#搭建etcd集群时生成的客户端密钥
keyFile: /etc/etcd/ssl/etcd-key.pem
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.26.0
controlPlaneEndpoint: 127.0.0.1:8443 # 负载均衡的IP+Port
networking:
dnsDomain: cluster.local
serviceSubnet: ##SERVICE_CIDR##
podSubnet: ##CLUSTER_CIDR##
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs #kube-proxy模式
---
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 0s
cacheUnauthorizedTTL: 0s
cgroupDriver: systemd
clusterDNS:
- ##CLUSTER_KUBERNETES_SVC_IP##
clusterDomain: cluster.local
cpuManagerReconcilePeriod: 0s
evictionPressureTransitionPeriod: 0s
fileCheckFrequency: 0s
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 0s
imageMinimumGCAge: 0s
kind: KubeletConfiguration
logging:
flushFrequency: 0
options:
json:
infoBufferSize: "0"
verbosity: 0
memorySwap: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 0s
resolvConf: /run/systemd/resolve/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 0s
shutdownGracePeriod: 0s
shutdownGracePeriodCriticalPods: 0s
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s
EOF
开始初始化
sed -i "s@##master1##@$master1@g" kubeadm_init.yaml
sed -i "s@##SERVICE_CIDR##@$SERVICE_CIDR@g" kubeadm_init.yaml
sed -i "s@##CLUSTER_CIDR##@$CLUSTER_CIDR@g" kubeadm_init.yaml
sed -i "s@##CLUSTER_KUBERNETES_SVC_IP##@$CLUSTER_KUBERNETES_SVC_IP@g" kubeadm_init.yaml
kubeadm init --config=kubeadm_init.yaml
配置kubeconfig
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
安装网络插件
cat <<EOF >> flannel.yaml
---
kind: Namespace
apiVersion: v1
metadata:
name: kube-flannel
labels:
pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-flannel
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "$CLUSTER_CIDR",
"Backend": {
"Type": "vxlan"
}
}
#POD对应的CIDR
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-flannel
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni-plugin
#image: flannelcni/flannel-cni-plugin:v1.1.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.0
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
#image: flannelcni/flannel:v0.19.2 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel:v0.19.2
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
#image: flannelcni/flannel:v0.19.2 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel:v0.19.2
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: xtables-lock
mountPath: /run/xtables.lock
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
EOF
kubectl apply -f flannel.yaml
检查是否成功
kubectl get pod -n kube-flannel
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-bhtq4 1/1 Running 0 5m26s
kubectl get node
NAME STATUS ROLES AGE VERSION
node Ready control-plane 56m v1.26.0
添加节点
添加Worker节点
生成token
kubeadm token create --print-join-command
按提示到其他工作节点进行输入
for host in node1 node2;do ssh $host "kubeadm join 127.0.0.1:8443 --token phyh1z.9nbkxuc2rjwl6lhl --discovery-token-ca-cert-hash sha256:93b8abf312eb1ecec18a3c0317a18bf494b45aafba5f368f2a67489ea4360b7e " ;done
检查是否成功
kubectl get node
NAME STATUS ROLES AGE VERSION
master1 Ready control-plane 1h v1.26.0
node1 Ready <none> 41s v1.26.0
node2 Ready <none> 119s v1.26.0
添加控制节点
更新证书
kubeadm init phase upload-certs --upload-certs --config kubeadm_init.yaml
W1228 23:56:43.166317 98389 utils.go:69] The recommended value for "clusterDNS" in "KubeletConfiguration" is: [192.168.0.10]; the provided value is: [192.168.0.1]
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
e55be7a28936f39f26327678a274209049fba18f3d1f4b010570fb439168a844
将之前生成的token和这次生成的key拼接起来即可
for host in master2 master3;do ssh $host "kubeadm join 127.0.0.1:8443 --token phyh1z.9nbkxuc2rjwl6lhl --discovery-token-ca-cert-hash sha256:93b8abf312eb1ecec18a3c0317a18bf494b45aafba5f368f2a67489ea4360b7e --control-plane --certificate-key e55be7a28936f39f26327678a274209049fba18f3d1f4b010570fb439168a844" ;done
检查是否成功
kubectl get node
NAME STATUS ROLES AGE VERSION
master2 Ready control-plane 6m39s v1.26.0
master3 Ready control-plane 4m55s v1.26.0
master1 Ready control-plane 1h v1.26.0
node1 Ready <none> 16m v1.26.0
node2 Ready <none> 17m v1.26.0
修改配置文件
- 管理节点修改两个文件工作节点只需要修改kubelet.conf
cd /etc/kubernetes
# 修改/etc/kubernetes/admin.conf/etc/kubernetes/kubelet.conf文件中的server ip改成127.0.0.1
vi /etc/kubernetes/admin.conf
vi /etc/kubernetes/kubelet.conf
# 覆盖配置
cp /etc/kubernetes/admin.conf ~/.kube/config
- 重启kubelet
source /opt/k8s_env.sh
for host in ${HOSTS[@]};do
ssh $i systemctl restart kubelet
ssh $i systemctl is-active kubelet
done
删除旧的证书,生成新证书
cd /etc/kubernetes/pki
# 先备份
mv apiserver.key apiserver.key.bak
mv apiserver.crt apiserver.crt.bak
# 使用如下命令生成分别在三个master节点上执行
kubeadm init phase certs apiserver --apiserver-advertise-address 当前节点IP --apiserver-cert-extra-sans "127.0.0.1,192.168.0.1"
kubeadm init phase certs apiserver --apiserver-advertise-address 当前节点IP --apiserver-cert-extra-sans "127.0.0.1,192.168.0.1"
kubeadm init phase certs apiserver --apiserver-advertise-address 当前节点IP --apiserver-cert-extra-sans "127.0.0.1,192.168.0.1"
# --apiserver-cert-extra-sans "127.0.0.1"设置了这个之后加入节点验证证书阶段就不会报错了。