• 如果您觉得本站非常有看点,那么赶紧使用Ctrl+D 收藏吧

03 . 二进制部署kubernetes1.18.4

开发技术 开发技术 3周前 (06-25) 21次浏览

简介

目前生产部署kubernetes集群主要两种方式

kubeadm

Kubeadm是一个K8s部署工具,提供kubeadm init和kubeadm join,用于快速部署Kubernetes集群。

二进制包

从github下载发行版的二进制包,手动部署每个组件,组成Kubernetes集群。

Kubeadm降低部署门槛,但屏蔽了很多细节,遇到问题很难排查。如果想更容易可控,推荐使用二进制包部署Kubernetes集群,虽然手动部署麻烦点,期间可以学习很多工作原理,也利于后期维护。

二进制部署K8s

List
CentOS7.3
cni-plugins-linux-amd64-v0.8.6.tgz
etcd-v3.4.9-linux-amd64.tar.gz
kube-flannel.yml
kubernetes-server-linux-amd64.tar.gz
角色 IP 组件
master 192.168.31.71 kube-apiserver,kube-controller-manager,kube-scheduler,etcd
Node1 192.168.31.74 kube-apiserver,kube-controller-manager,kube-scheduler
Node2 192.168.31.72 kubelet,kube-proxy,docker etcd

初始化环境

# 初始化
init_security() {
systemctl stop firewalld
systemctl disable firewalld &>/dev/null
setenforce 0
sed -i '/^SELINUX=/ s/enforcing/disabled/'  /etc/selinux/config
sed -i '/^GSSAPIAu/ s/yes/no/' /etc/ssh/sshd_config
sed -i '/^#UseDNS/ {s/^#//;s/yes/no/}' /etc/ssh/sshd_config
systemctl enable sshd crond &> /dev/null
rpm -e postfix --nodeps
echo -e "33[32m [安全配置] ==> OK 33[0m"
}
init_security

init_yumsource() {
if [ ! -d /etc/yum.repos.d/backup ];then
    mkdir /etc/yum.repos.d/backup
fi
mv /etc/yum.repos.d/* /etc/yum.repos.d/backup 2>/dev/null
if ! ping -c2 www.baidu.com &>/dev/null    
then
    echo "您无法上外网,不能配置yum源"
    exit    
fi
    curl -o /etc/yum.repos.d/163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo &>/dev/null
    curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo &>/dev/null
    yum clean all
    timedatectl set-timezone Asia/Shanghai
    echo "nameserver 114.114.114.114" > /etc/resolv.conf
    echo "nameserver 8.8.8.8" >> /etc/resolv.conf
    chattr +i /etc/resolv.conf
    yum -y install ntpdate
    ntpdate -b  ntp1.aliyun.com        # 对时很重要
    echo -e "33[32m [YUM Source] ==> OK 33[0m"
}
init_yumsource

# 关掉swap分区
swapoff -a
# 如果想永久关掉swap分区,打开如下文件注释掉swap哪一行即可.
sed -i '/ swap / s/^(.*)$/#1/g' /etc/fstab #永久

# 配置主机名解析
tail -3 /etc/hosts
192.168.0.121 master
192.168.0.123 node1
192.168.0.124 node2

# 将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system  # 生效


# 升级内核(非必须,只是性能更好)
wget https://cbs.centos.org/kojifiles/packages/kernel/4.9.220/37.el7/x86_64/kernel-4.9.220-37.el7.x86_64.rpm
  
rpm -ivh kernel-4.9.220-37.el7.x86_64.rpm
reboot

部署etcd集群

Etcd 是一个分布式键值存储系统,Kubernetes使用Etcd进行数据存储,所以先准备一个Etcd数据库,为解决Etcd单点故障,应采用集群方式部署,这里使用3台组建集群,可容忍1台机器故障,当然,你也可以使用5台组建集群,可容忍2台机器故障。

节点名称 IP
etcd-1 192.168.31.71
etcd-2 192.168.31.72
etcd-3 192.168.31.73

注:为了节省机器,这里与K8s节点机器复用。也可以独立于k8s集群之外部署,只要apiserver能连接到就行。

准备cfssl证书生成工具

cfssl是一个开源的证书管理工具,使用json文件生成证书,相比openssl更方便使用。

找任意一台服务器操作,这里用Master节点。

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo
生成etcd证书
创建工作目录
mkdir -p ~/TLS/{etcd,k8s}

cd TLS/etcd
自签CA
cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json << EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}
EOF
生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

ls *pem
ca-key.pem  ca.pem
使用自签CA签发etcd https证书

创建证书申请文件

cat > server-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.0.121",
    "192.168.0.123",
    "192.168.0.124"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

注:上述文件hosts字段中IP为所有etcd节点的集群内部通信IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。

生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

ls server*pem
server-key.pem  server.pem
下载etcd二进制文件
wget https://github.com/etcd-io/etcd/releases/download/v3.4.9/etcd-v3.4.9-linux-amd64.tar.gz
创建工作目录并解压二进制包
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.4.9-linux-amd64.tar.gz
mv etcd-v3.4.9-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

# 配置etcd
cat /opt/etcd/cfg/etcd.conf 
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.0.121:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.0.121:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.0.121:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.0.121:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.0.121:2380,etcd-2=https://192.168.0.123:2380,etcd-3=https://192.168.0.124:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

# ETCD_NAME:节点名称,集群中唯一
# ETCD_DATA_DIR:数据目录
# ETCD_LISTEN_PEER_URLS:集群通信监听地址
# ETCD_LISTEN_CLIENT_URLS:客户端访问监听地址
# ETCD_INITIAL_ADVERTISE_PEER_URLS:集群通告地址
# ETCD_ADVERTISE_CLIENT_URLS:客户端通告地址
# ETCD_INITIAL_CLUSTER:集群节点地址
# ETCD_INITIAL_CLUSTER_TOKEN:集群Token
# ETCD_INITIAL_CLUSTER_STATE:加入集群的当前状态,new是新集群,existing表示加入已有集群
systemd管理etcd
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd 
--cert-file=/opt/etcd/ssl/server.pem 
--key-file=/opt/etcd/ssl/server-key.pem 
--peer-cert-file=/opt/etcd/ssl/server.pem 
--peer-key-file=/opt/etcd/ssl/server-key.pem 
--trusted-ca-file=/opt/etcd/ssl/ca.pem 
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem 
--logger=zap
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
拷贝刚生成证书及生成的文件拷贝到节点2,节点3
cp ~/TLS/etcd/ca*pem ~/TLS/etcd/server*pem /opt/etcd/ssl/

scp -r /opt/etcd/ node1:/opt/
scp -r /opt/etcd/ node2:/opt/
scp /usr/lib/systemd/system/etcd.service node1:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/etcd.service node2:/usr/lib/systemd/system/
修改节点2和节点3etcd.conf配置文件
node-1
cat /opt/etcd/cfg/etcd.conf 
#[Member]
ETCD_NAME="etcd-2"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.0.123:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.0.123:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.0.123:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.0.123:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.0.121:2380,etcd-2=https://192.168.0.123:2380,etcd-3=https://192.168.0.124:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"


# node-2
#[Member]
ETCD_NAME="etcd-3"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.0.124:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.0.124:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.0.124:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.0.124:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.0.121:2380,etcd-2=https://192.168.0.123:2380,etcd-3=https://192.168.0.124:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

# 启动服务并设置开机自启
systemctl daemon-reload
systemctl start etcd
systemctl enable etcd
验证etcd集群状态
 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.0.121:2379,https://192.168.0.123:2379,https://192.168.0.124:2379" endpoint healthhttps://192.168.0.124:2379 is healthy: successfully committed proposal: took = 13.213712ms
https://192.168.0.121:2379 is healthy: successfully committed proposal: took = 12.907787ms
https://192.168.0.123:2379 is healthy: successfully committed proposal: took = 12.168703ms
        
# 如果输出上面信息,就说明集群部署成功。如果有问题第一步先看日志:/var/log/message 或 journalctl -u etcd

安装docker

下载安装docker
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce-19.03.9-3.el7
配置docker镜像源
mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
启动并设置开机自启
systemctl daemon-reload
systemctl start docker
systemctl enable docker

部署Master Node

生成kube-apiserver证书

1. 自签证书颁发机构(CA)

cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

# 生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

ls *pem
ca-key.pem  ca.pem
使用自签CA签发kube-apiserver https 证书
cat /root/TLS/k8s/server-csr.json 
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.0.121",
      "192.168.0.123",
      "192.168.0.124",
      "192.168.0.125",
      "192.168.0.100",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}

# 上述文件hosts字段中IP为所有Master/LB/VIP IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。

# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

ls server*pem
server-key.pem  server.pem
下载解压二进制包
wget https://dl.k8s.io/v1.18.4/kubernetes-server-linux-amd64.tar.gz
mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs} 
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin
cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin
cp kubectl /usr/bin/
部署kube-apiserver
cat /opt/kubernetes/cfg/kube-apiserver.conf 
KUBE_APISERVER_OPTS="--logtostderr=false 
--v=2 
--log-dir=/opt/kubernetes/logs 
--etcd-servers=https://192.168.0.121:2379,https://192.168.0.123:2379,https://192.168.0.124:2379 
--bind-address=192.168.0.121 
--secure-port=6443 
--advertise-address=192.168.0.121 
--allow-privileged=true 
--service-cluster-ip-range=10.0.0.0/24 
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction 
--authorization-mode=RBAC,Node 
--enable-bootstrap-token-auth=true 
--token-auth-file=/opt/kubernetes/cfg/token.csv 
--service-node-port-range=30000-32767 
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem 
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem 
--tls-cert-file=/opt/kubernetes/ssl/server.pem  
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem 
--client-ca-file=/opt/kubernetes/ssl/ca.pem 
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem 
--etcd-cafile=/opt/etcd/ssl/ca.pem 
--etcd-certfile=/opt/etcd/ssl/server.pem 
--etcd-keyfile=/opt/etcd/ssl/server-key.pem 
--audit-log-maxage=30 
--audit-log-maxbackup=3 
--audit-log-maxsize=100 
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"


# –logtostderr:启用日志
# —v:日志等级
# –log-dir:日志目录
# –etcd-servers:etcd集群地址
# –bind-address:监听地址
# –secure-port:https安全端口
# –advertise-address:集群通告地址
# –allow-privileged:启用授权
# –service-cluster-ip-range:Service虚拟IP地址段
# –enable-admission-plugins:准入控制模块
# –authorization-mode:认证授权,启用RBAC授权和节点自管理
# –enable-bootstrap-token-auth:启用TLS bootstrap机制
# –token-auth-file:bootstrap token文件
# –service-node-port-range:Service nodeport类型默认分配端口范围
# –kubelet-client-xxx:apiserver访问kubelet客户端证书
# –tls-xxx-file:apiserver https证书
# –etcd-xxxfile:连接Etcd集群证书
# –audit-log-xxx:审计日志
拷贝刚生成证书
cp ~/TLS/k8s/ca*pem ~/TLS/k8s/server*pem /opt/kubernetes/ssl/
启用TLS Bootstrapping机制

TLS Bootstraping:Master apiserver启用TLS认证后,Node节点kubelet和kube-proxy要与kube-apiserver进行通信,必须使用CA签发的有效证书才可以,当Node节点很多时,这种客户端证书颁发需要大量工作,同样也会增加集群扩展复杂度。为了简化流程,Kubernetes引入了TLS bootstraping机制来自动颁发客户端证书,kubelet会以一个低权限用户自动向apiserver申请证书,kubelet的证书由apiserver动态签署。所以强烈建议在Node上使用这种方式,目前主要用于kubelet,kube-proxy还是由我们统一颁发一个证书

TLS bootstraping 工作流程

03 . 二进制部署kubernetes1.18.4

创建上述配置文件中token文件

cat > /opt/kubernetes/cfg/token.csv << EOF
c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper"
EOF

# 格式:token,用户名,UID,用户组

token也可自行生成替换

head -c 16 /dev/urandom | od -An -t x | tr -d ' '
systemd管理apiserver
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
启动设置开机启动
systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver
授权kubelet-bootstrap用户允许请求证书
kubectl create clusterrolebinding kubelet-bootstrap 
--clusterrole=system:node-bootstrapper 
--user=kubelet-bootstrap

部署kube-controller-manager

创建配置文件
cat /opt/kubernetes/cfg/kube-controller-manager.conf 
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false 
--v=2 
--log-dir=/opt/kubernetes/logs 
--leader-elect=true 
--master=127.0.0.1:8080 
--bind-address=127.0.0.1 
--allocate-node-cidrs=true 
--cluster-cidr=10.244.0.0/16 
--service-cluster-ip-range=10.0.0.0/24 
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem 
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  
--root-ca-file=/opt/kubernetes/ssl/ca.pem 
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem 
--experimental-cluster-signing-duration=87600h0m0s"

# –master:通过本地非安全本地端口8080连接apiserver。
# –leader-elect:当该组件启动多个时,自动选举(HA)
# –cluster-signing-cert-file/–cluster-signing-key-file:自动为kubelet颁发证书的CA,与apiserver保持一致
systemd管理controller-manager
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
启动设置开机启动
systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager

部署kube-scheduler

创建配置文件
cat /opt/kubernetes/cfg/kube-scheduler.conf 
KUBE_SCHEDULER_OPTS="--logtostderr=false --v=2 --log-dir=/opt/kubernetes/logs --leader-elect --master=127.0.0.1:8080 --bind-address=127.0.0.1"

# –master:通过本地非安全本地端口8080连接apiserver。
# –leader-elect:当该组件启动多个时,自动选举(HA)
systemd管理scheduler
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
启动并设置开机自启动
systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler
查看集群状态
# 所有组件都已经启动成功,通过kubectl工具查看当前集群组件状态:
kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"} 

部署worker node

下面还是在Master Node上操作,即同时作为Worker Node

创建工作目录并拷贝二进制文件

在所有worker node创建工作目录

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs} 

从master节点拷贝

cd kubernetes/server/bin
cp kubelet kube-proxy /opt/kubernetes/bin   # 本地拷贝,注释这里操作还是master节点,

部署kubelet

创建配置文件
cat /opt/kubernetes/cfg/kubelet.conf 
KUBELET_OPTS="--logtostderr=false 
--v=2 
--log-dir=/opt/kubernetes/logs 
--hostname-override=master 
--network-plugin=cni 
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig 
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig 
--config=/opt/kubernetes/cfg/kubelet-config.yml 
--cert-dir=/opt/kubernetes/ssl 
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"


# –hostname-override:显示名称,集群中唯一
# –network-plugin:启用CNI
# –kubeconfig:空路径,会自动生成,后面用于连接apiserver
# –bootstrap-kubeconfig:首次启动向apiserver申请证书
# –config:配置参数文件
# –cert-dir:kubelet证书生成目录
# –pod-infra-container-image:管理Pod网络容器的镜像
配置参数文件
cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local 
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /opt/kubernetes/ssl/ca.pem 
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
EOF
生成bootstrap.kubeconfig文件
KUBE_APISERVER="https://192.168.0.121:6443" # apiserver IP:PORT

TOKEN="c47ffb939f5ca36231d9e3121a252940" # 与token.csv里保持一致

# 生成 kubelet bootstrap kubeconfig 配置文件
kubectl config set-cluster kubernetes 
  --certificate-authority=/opt/kubernetes/ssl/ca.pem 
  --embed-certs=true 
  --server=${KUBE_APISERVER} 
  --kubeconfig=bootstrap.kubeconfig
  
  
kubectl config set-credentials "kubelet-bootstrap" 
  --token=${TOKEN} 
  --kubeconfig=bootstrap.kubeconfig
  
  
kubectl config set-context default 
  --cluster=kubernetes 
  --user="kubelet-bootstrap" 
  --kubeconfig=bootstrap.kubeconfig
  
  
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

# 拷贝到配置文件路径
cp bootstrap.kubeconfig /opt/kubernetes/cfg
systemd管理kubelet
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
启动并设置开机自启
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
批准kubelet证书并加入集群
# 查看kubelet证书请求
kubectl get csr
NAME                                                   AGE    SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A   6m3s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

# 批准申请
kubectl certificate approve node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A

# 查看节点
kubectl get node
NAME     STATUS   ROLES    AGE    VERSION
master   Ready    <none>   123m   v1.18.4

# 由于网络插件还没有部署,节点会没有准备就绪 NotReady

部署kube-proxy

创建配置文件
cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
EOF
创建参数文件
cat > /opt/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
  kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: k8s-master
clusterCIDR: 10.0.0.0/24
EOF
生成kube-proxy.kubeconfig文件

生成kube-proxy证书

# 切换工作目录
cd TLS/k8s

# 创建证书请求文件
cat > kube-proxy-csr.json << EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

ls kube-proxy*pem
kube-proxy-key.pem  kube-proxy.pem
生成kubeconfig文件
KUBE_APISERVER="https://192.168.0.121:6443"

kubectl config set-cluster kubernetes 
  --certificate-authority=/opt/kubernetes/ssl/ca.pem 
  --embed-certs=true 
  --server=${KUBE_APISERVER} 
  --kubeconfig=kube-proxy.kubeconfig
  
kubectl config set-credentials kube-proxy 
  --client-certificate=./kube-proxy.pem 
  --client-key=./kube-proxy-key.pem 
  --embed-certs=true 
  --kubeconfig=kube-proxy.kubeconfig
  
kubectl config set-context default 
  --cluster=kubernetes 
  --user=kube-proxy 
  --kubeconfig=kube-proxy.kubeconfig
  
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

# 拷贝配置文件到指定路径
cp kube-proxy.kubeconfig /opt/kubernetes/cfg/
systemd管理kube-proxy
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
启动并设置开机启动
systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy

部署CNI网络

准备二进制文件
wget https://github.com/containernetworking/plugins/releases/download/v0.8.6/cni-plugins-linux-amd64-v0.8.6.tgz
  
# 解压二进制文件并移动到默认工作目录
mkdir /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin

# 部署cni网络
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
sed -i -r "s#quay.io/coreos/flannel:.*-amd64#lizhenliang/flannel:v0.12.0-amd64#g" kube-flannel.yml

# 默认镜像地址无法访问,修改为docker hub镜像仓库。
kubectl apply -f kube-flannel.yml

kubectl get pods -n kube-system
NAME                          READY   STATUS    RESTARTS   AGE
kube-flannel-ds-amd64-2pc95   1/1     Running   0          72s

kubectl get node
NAME         STATUS   ROLES    AGE   VERSION
master   Ready    <none>   41m   v1.18.4
# 部署好网络插件,Node准备就绪
授权apiserver访问kubelet
cat > apiserver-to-kubelet-rbac.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
      - pods/log
    verbs:
      - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
EOF

kubectl apply -f apiserver-to-kubelet-rbac.yaml
新增加Worker Node

拷贝已部署好的Node相关文件到新节点

scp -r /opt/kubernetes/ node1:/opt/
scp -r /usr/lib/systemd/system/{kubelet,kube-proxy}.service node1:/usr/lib/systemd/system

scp -r /opt/cni/ node1:/opt/
scp /opt/kubernetes/ssl/ca.pem node1:/opt/kubernetes/ssl
删除kubelet证书和kubeconfig文件
rm -f /opt/kubernetes/cfg/kubelet.kubeconfig 
rm -f /opt/kubernetes/ssl/kubelet*

# 这几个文件是证书申请审批后自动生成的,每个Node不同,必须删除重新生成。
修改主机名并设置开机自启动
vi /opt/kubernetes/cfg/kubelet.conf
--hostname-override=node1

vi /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: node1

# 启动并设置开机启动
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
systemctl start kube-proxy
systemctl enable kube-proxy
再master上批准Node kubelet证书申请
kubectl get csr
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro   89s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

kubectl certificate approve node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro

kubectl get node
NAME     STATUS   ROLES    AGE    VERSION
master   Ready    <none>   138m   v1.18.4
node1    Ready    <none>   120m   v1.18.4
node2    Ready    <none>   112m   v1.18.4

部署Dashboard

下载dashboard.yaml文件
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml
修改yaml配置文件使其端口暴露外部访问
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml
  
# 默认Dashboard只能集群内部访问,修改Service为NodePort类型,暴露到外部:

vi recommended.yaml
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001  # 修改这里
  type: NodePort   # 修改这里
  selector:
    k8s-app: kubernetes-dashboard

kubectl apply -f recommended.yaml

kubectl get pods,svc -n kubernetes-dashboard
NAME                                             READY   STATUS    RESTARTS   AGE
pod/dashboard-metrics-scraper-694557449d-69x7g   1/1     Running   0          111m
pod/kubernetes-dashboard-9774cc786-kwgkt         1/1     Running   0          111m

NAME                                TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
service/dashboard-metrics-scraper   ClusterIP   10.0.0.3     <none>        8000/TCP        111m
service/kubernetes-dashboard        NodePort    10.0.0.122   <none>        443:30001/TCP   111m
创建service account并绑定默认cluster-admin管理员集群角色
kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

# 接下来访问https://node ip:30001
# 然后将上面过滤出来的token复制上面即可访问dashboard

# 我们可以部署个Nginx测试下集群可用性
kubectl run --generator=run-pod/v1 nginx-test2 --image=daocloud.io/library/nginx --port=80 --replicas=1

kubectl get pods -o wide
kubectl get pods -o wide
NAME          READY   STATUS    RESTARTS   AGE   IP           NODE    NOMINATED NODE   READINESS GATES
nginx-test2   1/1     Running   0          89m   10.244.2.2   node2   <none>           <none>

# 我们去相应的节点访问指定IP即可访问
[root@node1 ~]# curl -I -s  10.244.2.2 |grep 200
HTTP/1.1 200 OK

03 . 二进制部署kubernetes1.18.4

03 . 二进制部署kubernetes1.18.4

此篇文章借鉴于公众号DevOps技术栈 ,作者阿良


喜欢 (0)