二进制安装k8s-单master节点

目录

一、系统初始化

二、部署master组件etcd(master节点操作)

三、kubernetes 软件包下载及安装(master节点操作)

四、部署master组件apiserver(master节点操作)

五、部署kubectl工具(master执行)

六、部署controller-manager(master操作)

七、部署master组件scheduler服务(master操作)

八、部署安装docker(工作节点node安装操作)

九、node节点kubelet组件安装

十、node节点kube-proxy组件安装

十一、网络组件flannel安装

十二、coredns插件安装(master节点操作)

---

  一、系统初始化

主机IP	主机名	角色	软件列表
192.16.20.110	k8s-master	master	etcd kube-apiserver kube-controller-manager kube-scheduler
192.16.20.111	K8s-node1	worker	kubelet kube-proxy docker

网络名称	网段
Service网络	10.40.0.0/16
Pod网络	172.40.0.0/16

# 环境初始化

cat >> /etc/hosts << EOF

192.168.20.110 k8s-master

192.168.20.111 k8s-node1

EOF



systemctl stop firewalld && systemctl disable firewalld && setenforce 0 && sed -ri 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config



swapoff -a && sed -ri 's/.*swap.*/#&/' /etc/fstab



cat <> /etc/security/limits.conf

* soft nofile 655360

* hard nofile 131072

* soft nproc 655350

* hard nproc 655350

* soft memlock unlimited

* hard memlock unlimited

EOF



#升级内核

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

yum -y install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm

yum  --enablerepo="elrepo-kernel"  -y install kernel-ml.x86_64

grub2-set-default 0

grub2-mkconfig -o /boot/grub2/grub.cfg

reboot  #重启生效



cat >/etc/modules-load.d/ipvs.conf < /etc/modules-load.d/containerd.conf << EOF

overlay

br_netfilter

EOF



cat < /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 = 131072

net.ipv4.tcp_max_syn_backlog = 16384

net.ipv4.tcp_timestamps = 0

net.core.somaxconn = 16384

EOF

二、部署master组件etcd(master节点操作)

# 创建工作目录

mkdir /opt/packages

# 获取 cfssl 工具 外网下载很慢

cd /opt/packages/
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

# 赋予执行权限

chmod +x cf*

# 将 cfssl 工具 cp 至 /usr/local/bin 下

cp ./cfssl_linux-amd64 /usr/local/bin/cfssl
cp ./cfssljson_linux-amd64 /usr/local/bin/cfssljson
cp ./cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo

# 查看 cfssl 版本

cfssl version

# 部署etcd

mkdir /opt/packages/cert
cd /opt/packages/cert

# 配置 ca 证书请求文件

cat > ca-csr.json << EOF
{
  "CN": "kubernetes",
  "key": {
      "algo": "rsa",
      "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "kubemsb",
      "OU": "CN"
    }
  ],
  "ca": {
          "expiry": "87600h"
  }
}
EOF

# 创建 ca 证书

cfssl gencert -initca ca-csr.json | cfssljson -bare ca

# 配置 ca 证书策略

cat > ca-config.json << EOF

{

  "signing": {

      "default": {

          "expiry": "87600h"

        },

      "profiles": {

          "kubernetes": {

              "usages": [

                  "signing",

                  "key encipherment",

                  "server auth",

                  "client auth"

              ],

              "expiry": "87600h"

          }

      }

  }

}

EOF

# 配置 ectd 请求文件,下面ip节点的ip地址需要根据自身情况修改

cat > etcd-csr.json << EOF

{

  "CN": "etcd",

  "hosts": [

    "127.0.0.1",

    "192.168.20.110",

    "192.168.20.111"     

  ],

  "key": {

    "algo": "rsa",

    "size": 2048

  },

  "names": [{

    "C": "CN",

    "ST": "Beijing",

    "L": "Beijing",

    "O": "kubemsb",

    "OU": "CN"

  }]

}

EOF

# 生成 etcd 证书

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson  -bare etcd

# 下载 etcd 软件包

cd /opt/packages

wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz

tar xf etcd-v3.5.2-linux-amd64.tar.gz

cp ./etcd-v3.5.2-linux-amd64/etcd* /usr/local/bin/

# 查看当前 etcd 版本

etcdctl version

# 创建 etcd 配置目录，以及数据目录

mkdir /opt/kubernetes/etcd/default.etcd -p

mkdir /opt/kubernetes/ssl -p

# etcd配置文件(修改对应的ip)

cat >  /opt/kubernetes/etcd/etcd.conf << EOF

# 成员信息

#[Member]

ETCD_NAME="etcd1"

ETCD_DATA_DIR="/opt/kubernetes/etcd/default.etcd"

ETCD_LISTEN_PEER_URLS="https://192.168.20.110:2380"

ETCD_LISTEN_CLIENT_URLS="https://192.168.20.110:2379,http://127.0.0.1:2379"

# 集群信息

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.20.110:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.20.110:2379"

ETCD_INITIAL_CLUSTER="etcd1=https://192.168.20.110:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

ETCD_ENABLE_V2=true

EOF

# cp 证书到指定目录

cp /opt/packages/cert/ca*.pem /opt/kubernetes/ssl

cp /opt/packages/cert/etcd*.pem /opt/kubernetes/ssl

# 创建etcd启动文件(注意修改对应的信息)

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=simple

EnvironmentFile=/opt/kubernetes/etcd/etcd.conf

WorkingDirectory=/opt/kubernetes/etcd/

ExecStart=/usr/local/bin/etcd  \

 --cert-file=/opt/kubernetes/ssl/etcd.pem \

 --key-file=/opt/kubernetes/ssl/etcd-key.pem \

 --trusted-ca-file=/opt/kubernetes/ssl/ca.pem \

 --peer-cert-file=/opt/kubernetes/ssl/etcd.pem \

 --peer-key-file=/opt/kubernetes/ssl/etcd-key.pem \

 --peer-trusted-ca-file=/opt/kubernetes/ssl/ca.pem \

 --peer-client-cert-auth --client-cert-auth

Restart=on-failure

RestartSec=5

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

EOF

# 启动etcd服务

systemctl daemon-reload && systemctl enable --now etcd && systemctl status etcd

# 查看 etcd 信息

ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table \
 --cacert=/opt/kubernetes/ssl/ca.pem --cert=/opt/kubernetes/ssl/etcd.pem \
 --key=/opt/kubernetes/ssl/etcd-key.pem \
 --endpoints=https://192.168.20.110:2379 endpoint status

三、kubernetes 软件包下载及安装(master节点操作)

# 下载软件包，也可至官方网站进行下载

wget https://dl.k8s.io/v1.21.10/kubernetes-server-linux-amd64.tar.gz

# 解压软件包

tar -xf kubernetes-server-linux-amd64.tar.gz

# 拷贝 kube-apiserver kube-controller-manager kube-scheduler kubectl 到 master 节点

cd /opt/packages/kubernetes/server/bin

cp kube-apiserver kube-controller-manager kubectl kube-scheduler /usr/local/bin/

# 拷贝 kubelet kube-proxy 到 worker 节点

scp kubelet kube-proxy 192.168.20.111:/usr/local/bin/

四、部署master组件apiserver(master节点操作)

#创建 apiserver 证书请求文件 (注意修改对应的hosts,这里我多加了几个ip)

cd /opt/packages/cert

cat > /opt/packages/cert/kube-apiserver-csr.json << "EOF"
{
"CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "192.168.20.110",
    "192.168.20.111",
    "192.168.20.112",
    "192.168.20.113",
    "10.40.0.1",
    "kubernetes",
    "kubernetes.default",
    "kubernetes.default.svc",
    "kubernetes.default.svc.cluster",
    "kubernetes.default.svc.cluster.local"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "kubemsb",
      "OU": "CN"
    }

  ]

}

EOF

# 生成 apiserver 证书及 token文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-apiserver-csr.json | cfssljson -bare kube-apiserver

cat > token.csv << EOF

$(head -c 16 /dev/urandom | od -An -t x | tr -d ' '),kubelet-bootstrap,10001,"system:kubelet-bootstrap"

EOF

# 配置文件(修改对应得ip和证书文件路径)

mkdir /opt/kubernetes/conf -p
mkdir /opt/kubernetes/logs/api-server/ -p
cat > /opt/kubernetes/conf/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
 --anonymous-auth=false \
 --bind-address=192.168.20.110 \
 --secure-port=6443 \
 --advertise-address=192.168.20.110 \
 --insecure-port=0 \
 --authorization-mode=Node,RBAC \
 --runtime-config=api/all=true \
 --enable-bootstrap-token-auth \
 --service-cluster-ip-range=10.40.0.0/16 \
 --token-auth-file=/opt/kubernetes/ssl/token.csv \
 --service-node-port-range=30000-50000 \
 --tls-cert-file=/opt/kubernetes/ssl/kube-apiserver.pem  \
 --tls-private-key-file=/opt/kubernetes/ssl/kube-apiserver-key.pem \
 --client-ca-file=/opt/kubernetes/ssl/ca.pem \
 --kubelet-client-certificate=/opt/kubernetes/ssl/kube-apiserver.pem \
 --kubelet-client-key=/opt/kubernetes/ssl/kube-apiserver-key.pem \
 --service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \
 --service-account-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \
 --service-account-issuer=api --etcd-cafile=/opt/kubernetes/ssl/ca.pem \
 --etcd-certfile=/opt/kubernetes/ssl/etcd.pem \
 --etcd-keyfile=/opt/kubernetes/ssl/etcd-key.pem \
 --etcd-servers=https://192.168.20.110:2379 \
 --enable-swagger-ui=true \
 --allow-privileged=true \
 --apiserver-count=2 \
 --audit-log-maxage=30 \
 --audit-log-maxbackup=3 \
 --audit-log-maxsize=100 \
 --audit-log-path=/opt/kubernetes/logs/api-server/kube-apiserver-audit.log \
 --event-ttl=1h \
 --alsologtostderr=true \
 --logtostderr=false \
 --log-dir=/opt/kubernetes/logs/api-server \
 --v=4"
EOF

# 创建 apiserver 服务管理配置文件

cat > /usr/lib/systemd/system/kube-apiserver.service << "EOF"
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=kube-apiserver.service

[Service]
EnvironmentFile=/opt/kubernetes/conf/kube-apiserver.conf
ExecStart=/usr/local/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536


[Install]
WantedBy=multi-user.target

EOF

# 拷贝证书文件到ssl目录

cp kube-apiserver*.pem /opt/kubernetes/ssl/

cp token.csv /opt/kubernetes/ssl/

# 启动 apiserver 服务

systemctl daemon-reload && systemctl enable --now kube-apiserver  && systemctl status kube-apiserver

五、部署kubectl工具(master执行)

#创建 kubectl 证书请求文件

cd /opt/packages/cert  

cat > admin-csr.json << "EOF"
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "system:masters",             
      "OU": "system"
    }
  ]
}
EOF

# 生成证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

# 复制文件到指定目录

cp admin*pem /opt/kubernetes/ssl/

# 配置证书 

# 配置管理的集群以及证书和证书访问链接(注意ip)
kubectl config set-cluster kubernetes --certificate-authority=/opt/kubernetes/ssl/ca.pem --embed-certs=true --server=https://192.168.20.110:6443 --kubeconfig=/root/.kube/config

# 配置证书角色 admin
kubectl config set-credentials admin --client-certificate=/opt/kubernetes/ssl/admin.pem --client-key=/opt/kubernetes/ssl/admin-key.pem --embed-certs=true --kubeconfig=/root/.kube/config

# 设置安全上下文
kubectl config set-context kubernetes --cluster=kubernetes --user=admin --kubeconfig=/root/.kube/config

# 使用安全上下文进行管理
kubectl config use-context kubernetes --kubeconfig=/root/.kube/config

# 进行角色绑定
kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes --kubeconfig=/root/.kube/config

#新增环境变量/etc/profile里面
export KUBECONFIG=$HOME/.kube/config

# 查看集群组件状态
kubectl get componentstatuses
kubectl cluster-info

# 查看命名空间中资源对象
kubectl get all --all-namespaces

六、部署controller-manager(master操作)

# 创建 kube-controller-manager 证书请求文件

cd /opt/packages/cert

cat > kube-controller-manager-csr.json << "EOF"
{
    "CN": "system:kube-controller-manager",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "hosts": [
      "127.0.0.1",
      "192.168.20.110",
      "192.168.20.111",
      "192.168.20.112",
      "192.168.20.113"
    ],
    "names": [
      {
        "C": "CN",
        "ST": "Beijing",
        "L": "Beijing",
        "O": "system:kube-controller-manager",
        "OU": "system"
      }
    ]
}
EOF

# 创建 kube-controller-manager 证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager

# 将证书拷贝至ssl目录

cp kube-controller-manager-key.pem kube-controller-manager.pem /opt/kubernetes/ssl/

# 配置管理的集群以及证书和证书访问链接

kubectl config set-cluster kubernetes --certificate-authority=/opt/kubernetes/ssl/ca.pem --embed-certs=true --server=https://192.168.20.110:6443 --kubeconfig=/opt/kubernetes/conf/kube-controller-manager.kubeconfig

# 设置集群需要的证书

kubectl config set-credentials system:kube-controller-manager --client-certificate=/opt/kubernetes/ssl/kube-controller-manager.pem --client-key=/opt/kubernetes/ssl/kube-controller-manager-key.pem --embed-certs=true --kubeconfig=/opt/kubernetes/conf/kube-controller-manager.kubeconfig

kubectl config set-context system:kube-controller-manager --cluster=kubernetes --user=system:kube-controller-manager --kubeconfig=/opt/kubernetes/conf/kube-controller-manager.kubeconfig

kubectl config use-context system:kube-controller-manager --kubeconfig=/opt/kubernetes/conf/kube-controller-manager.kubeconfig

# 创建 kube-controller-manager 配置文件(对应信息需要修改)

cat > /opt/kubernetes/conf/kube-controller-manager.conf << "EOF"
KUBE_CONTROLLER_MANAGER_OPTS="--port=10252 \
  --secure-port=10257 \
  --bind-address=127.0.0.1 \
  --kubeconfig=/opt/kubernetes/conf/kube-controller-manager.kubeconfig \
  --service-cluster-ip-range=10.40.0.0/16 \
  --cluster-name=kubernetes \
  --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \
  --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \
  --allocate-node-cidrs=true \
  --cluster-cidr=172.40.0.0/16 \
  --experimental-cluster-signing-duration=87600h \
  --root-ca-file=/opt/kubernetes/ssl/ca.pem \
  --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \
  --leader-elect=true \
  --feature-gates=RotateKubeletServerCertificate=true \
  --controllers=*,bootstrapsigner,tokencleaner \
  --horizontal-pod-autoscaler-use-rest-clients=true \
  --horizontal-pod-autoscaler-sync-period=10s \
  --tls-cert-file=/opt/kubernetes/ssl/kube-controller-manager.pem \
  --tls-private-key-file=/opt/kubernetes/ssl/kube-controller-manager-key.pem \
  --use-service-account-credentials=true \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/logs/control-manager \
  --v=2"

EOF

# 配置服务启动文件

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/conf/kube-controller-manager.conf
ExecStart=/usr/local/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
RestartSec=5



[Install]
WantedBy=multi-user.target

EOF

# 启动并验证

systemctl daemon-reload && systemctl enable --now kube-controller-manager && systemctl status kube-controller-manager

kubectl get componentstatuses

七、部署master组件scheduler服务(master操作)

# 创建 kube-scheduler 证书请求文件

cd /opt/packages/cert

cat > kube-scheduler-csr.json << "EOF"
{
    "CN": "system:kube-scheduler",
    "hosts": [
      "127.0.0.1",
      "192.168.20.110",
      "192.168.20.111",
      "192.168.20.112",
      "192.168.20.113"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
      {
        "C": "CN",
        "ST": "Beijing",
        "L": "Beijing",
        "O": "system:kube-scheduler",
        "OU": "system"
      }
    ]
}

EOF

# 创建 kube-scheduler 证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

cp kube-scheduler.pem kube-scheduler-key.pem /opt/kubernetes/ssl/

kubectl config set-cluster kubernetes --certificate-authority=/opt/kubernetes/ssl/ca.pem --embed-certs=true --server=https://192.168.20.110:6443 --kubeconfig=/opt/kubernetes/conf/kube-scheduler.kubeconfig

kubectl config set-credentials system:kube-scheduler --client-certificate=/opt/kubernetes/ssl/kube-scheduler.pem --client-key=/opt/kubernetes/ssl/kube-scheduler-key.pem --embed-certs=true --kubeconfig=/opt/kubernetes/conf/kube-scheduler.kubeconfig

kubectl config set-context system:kube-scheduler --cluster=kubernetes --user=system:kube-scheduler --kubeconfig=/opt/kubernetes/conf/kube-scheduler.kubeconfig

kubectl config use-context system:kube-scheduler --kubeconfig=/opt/kubernetes/conf/kube-scheduler.kubeconfig

# 创建服务配置文件

mkdir /opt/kubernetes/logs/scheduler -p

cat > /opt/kubernetes/conf/kube-scheduler.conf << "EOF"
KUBE_SCHEDULER_OPTS="--address=127.0.0.1 \
  --kubeconfig=/opt/kubernetes/conf/kube-scheduler.kubeconfig \
  --leader-elect=true \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/logs/scheduler \
  --v=2"
EOF

# 配置服务启动文件 

cat > /usr/lib/systemd/system/kube-scheduler.service << "EOF"
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/conf/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

EOF

#启动并验证

systemctl daemon-reload && systemctl enable --now kube-scheduler && systemctl status kube-scheduler

kubectl get componentstatuses

八、部署安装docker(工作节点node安装操作)

# docker的安装

wget -P /etc/yum.repos.d/ https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum -y install docker-ce-19.03.*

#创建数据目录

mkdir /data/docker -p

# 配置 docker daemon.json 文件

cat >/etc/docker/daemon.json <

# 启动docker服务

systemctl daemon-reload && systemctl enable --now docker

九、node节点kubelet组件安装

# node节点创建目录(node节点操作)

mkdir /opt/kubernetes/{ssl,logs,conf} -p

# 创建 kubelet-bootstrap.kubeconfig(master节点执行)

BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' /opt/kubernetes/ssl/token.csv)

kubectl config set-cluster kubernetes --certificate-authority=/opt/kubernetes/ssl/ca.pem --embed-certs=true --server=https://192.168.20.110:6443 \
--kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig

# 设置集群需要的证书(master节点执行)

kubectl config set-credentials kubelet-bootstrap --token=${BOOTSTRAP_TOKEN} --kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig

kubectl config set-context default --cluster=kubernetes --user=kubelet-bootstrap --kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig

kubectl config use-context default --kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig

kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=kubelet-bootstrap

kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap --kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig

# 拷贝证书和文件到node节点上面(master节点执行)

scp -r /opt/kubernetes/ssl/ca* 192.168.20.111:/opt/kubernetes/ssl

scp /opt/kubernetes/conf/kubelet-bootstrap.kubeconfig 192.168.20.111:/opt/kubernetes/conf/

# 创建kubelet的配置文件(node节点执行)

cat > /opt/kubernetes/conf/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.20.111
port: 10250
readOnlyPort: 10255
cgroupDriver: systemd
clusterDNS:
- 10.40.0.2
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

#创建system启动文件（如果不加cni插件参数，后面flanneld不需要安装cni插件）

mkdir /opt/kubernetes/logs/kubelet -p

cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet \
--alsologtostderr=true --logtostderr=false --v=2 --log-dir=/opt/kubernetes/logs/kubelet \
--hostname-override=k8s-node1 --network-plugin=cni \
--kubeconfig=/opt/kubernetes/conf/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/conf/kubelet-bootstrap.kubeconfig \
--config=/opt/kubernetes/conf/kubelet-config.yml \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2
Restart=on-failure
LimitNOFILE=65536


[Install]
WantedBy=multi-user.target

EOF

# 启动并验证

systemctl daemon-reload && systemctl enable --now kubelet && systemctl status kubelet

# node节点状态(get csr会出现请求文件内容则是正常的)

kubectl get csr

kubectl get node

十、node节点kube-proxy组件安装

# 创建 kube-proxy 证书请求文件(master节点执行)

cd /opt/packages/cert

cat > kube-proxy-csr.json << EOF

{
  "CN": "system:kube-proxy",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "kubemsb",
      "OU": "CN"
    }
  ]
}

EOF

# 生成配置kube-proxy证书(master节点执行)

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

kubectl config set-cluster kubernetes --certificate-authority=/opt/kubernetes/ssl/ca.pem --embed-certs=true --server=https://192.168.20.110:6443 --kubeconfig=/opt/kubernetes/conf/kube-proxy.kubeconfig

cp kube-proxy-key.pem kube-proxy.pem /opt/kubernetes/ssl/

kubectl config set-credentials kube-proxy --client-certificate=/opt/kubernetes/ssl/kube-proxy.pem --client-key=/opt/kubernetes/ssl/kube-proxy-key.pem --embed-certs=true --kubeconfig=/opt/kubernetes/conf/kube-proxy.kubeconfig

kubectl config set-context default --cluster=kubernetes --user=kube-proxy --kubeconfig=/opt/kubernetes/conf/kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=/opt/kubernetes/conf/kube-proxy.kubeconfig

# 拷贝到node节点(master节点执行)

scp /opt/kubernetes/ssl/kube-proxy* 192.168.20.111:/opt/kubernetes/ssl

scp /opt/kubernetes/conf/kube-proxy.kubeconfig 192.168.20.111:/opt/kubernetes/conf/

# 创建配置文件(node节点执行)

cat > /opt/kubernetes/conf/kube-proxy.yaml << "EOF"

apiVersion: kubeproxy.config.k8s.io/v1alpha1

bindAddress: 192.168.20.111

clientConnection:

  kubeconfig: /opt/kubernetes/conf/kube-proxy.kubeconfig

clusterCIDR: 172.40.0.0/16

healthzBindAddress: 192.168.20.111:10256               

kind: KubeProxyConfiguration                               

metricsBindAddress: 192.168.20.111:10249

mode: "ipvs"

EOF

# 创建system启动文件(node节点执行)

mkdir /opt/kubernetes/logs/kube-proxy -p

cat >  /usr/lib/systemd/system/kube-proxy.service << "EOF"
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
WorkingDirectory=/opt/kubernetes
ExecStart=/usr/local/bin/kube-proxy \
--config=/opt/kubernetes/conf/kube-proxy.yaml \
--alsologtostderr=true --logtostderr=false \
--log-dir=/opt/kubernetes/logs/kube-proxy \
--v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536


[Install]
WantedBy=multi-user.target
EOF

#启动

# 先安装这个组件不然重启有报错信息
yum -y install conntrack

systemctl daemon-reload && systemctl enable --now kube-proxy && systemctl status kube-proxy.service

十一、网络组件flannel安装

# fannel网络组件安装(node节点执行),节点处于NotReady状态需要安装网络组件

# 下载安装(node节点操作)

wget https://github.com/coreos/flannel/releases/download/v0.11.0/flannel-v0.11.0-linux-amd64.tar.gz

mkdir /usr/local/flannel -p

tar xf flannel-v0.11.0-linux-amd64.tar.gz -C /usr/local/flannel

#拷贝etcd证书到node节点

scp /opt/kubernetes/ssl/etcd* 192.168.20.111:/opt/kubernetes/ssl

# 创建flannel systemd unit文件(生成flannel网络文件/run/flannel/subnet.env)

cat > /usr/lib/systemd/system/flanneld.service << EOF
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
ExecStart=/usr/local/flannel/flanneld --ip-masq \
-etcd-endpoints=https://192.168.20.110:2379 \
-etcd-cafile=/opt/kubernetes/ssl/ca.pem \
-etcd-certfile=/opt/kubernetes/ssl/etcd.pem  \
-etcd-keyfile=/opt/kubernetes/ssl/etcd-key.pem \
-etcd-prefix=/coreos.com/network
#生成/run/flannel/docker如果用的docker网络(kubelet不加cni参数)就需要配置到docker服务启动
ExecStartPost=/usr/local/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker  
Restart=on-failure

[Install]
WantedBy=multi-user.target

EOF

# 在etcd中设置flannel的相关信息(master节点执行) 要用etcd_v2不然识别不到

ETCDCTL_API=2 etcdctl    \
--endpoints https://192.168.20.110:2379   \
--ca-file /opt/kubernetes/ssl/ca.pem   \
--cert-file /opt/kubernetes/ssl/etcd.pem   \
--key-file /opt/kubernetes/ssl/etcd-key.pem   \
set  /coreos.com/network/config '{"Network":"172.40.0.0/16","Backend":{"Type":"vxlan"}}'

# 重启flanneld服务(会生成/run/flannel/docker    /run/flannel/subnet.env文件)

systemctl daemon-reload && systemctl enable --now flanneld

# 新增配置docker启动文件(#kubelet要是没有加cni参数需要在docker启动服务里面加上这，比较重要，如果用的cni插件就不用加这些了,重启docker后docker0的ip段会变成/run/flannel/docker里面的网段)

vim /usr/lib/systemd/system/docker.service

EnvironmentFile=/run/flannel/docker    

ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock $DOCKER_NETWORK_OPTIONS

 systemctl daemon-reload && systemctl restart docker

# 如果kubelet没有加cni参数则无需执行下面的

# 安装flannel完成后kubelet报错Unable to update cni config" err="no networks found in /etc/cni/net.d

# kubectl get node 还是NotReady状态原因是kubelet加了cni参数后会调用cni的插件,需要安装下插件

mkdir -p /etc/cni/net.d

mkdir -p /opt/cni/bin

wget https://github.com/containernetworking/plugins/releases/download/v0.9.0/cni-plugins-linux-amd64-v0.9.0.tgz

# 解压到bin目录里面

tar xf cni-plugins-linux-amd64-v0.9.0.tgz -C /opt/cni/bin

# 创建配置文件

cat > /etc/cni/net.d/10-flannel.conflist << EOF

{

  "cniVersion": "0.4.0",

  "name": "cbr0",

  "plugins": [

    {

      "type": "flannel",

      "delegate": {

        "hairpinMode": true,

        "isDefaultGateway": true

      }

    },

    {

      "type": "portmap",

      "capabilities": {

        "portMappings": true

      }

    }

  ]

}

EOF

# 重启kubelet就可以看到node节点ready了,要出现cni0网卡代表cni插件成功(网段必须要和/run/flannel/subnet.env  FLANNEL_SUBNET=172.40.4.1一致)

systemctl restart kubelet.service

systemctl restart flanneld

十二、coredns插件安装(master节点操作)

https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/coredns/coredns.yaml.base

#将里面内容复制进去

vim coredns.yaml

#修改k8s集群后缀名称__DNS__DOMAIN__，一般为cluster.local

# kubernetes __DNS__DOMAIN__ in-addr.arpa ip6.arpa {

kubernetes cluster.local in-addr.arpa ip6.arpa {

#修改coredns谷歌地址为dockerhub地址，容易下载

# image: k8s.gcr.io/coredns/coredns:v1.8.6  

image: coredns/coredns:1.8.6

#修改pod启动内存限制大小，300Mi即可

# memory: __DNS__MEMORY__LIMIT__

memory: 300Mi

#修改coredns的svcIP地址，一般为svc网段的第二位，10.40.0.2，第一位为apiserver的svc

#  clusterIP: __DNS__SERVER__

clusterIP: 10.40.0.2

# 部署coredns

kubectl apply -f coredns.yaml