二进制安装kubernetes

2021-01-19 本文已影响0人挑战_bae7

1. 使用二进制方式安装

https://www.kubernetes.org.cn/3096.html 参考

1.1 环境准备介绍

角色	IP地址	kubernetes	docker	etcd	服务
master	192.168.199.200	1.18.3	19.03.9	etcd v3.4.14	kube-apiserver、controller-manager、scheduler、kubelet、kube-proxy、kube-flannel
node1	192.168.199.201	1.18.3	19.03.9	etcd v3.4.14	kubelet、kube-proxy、kube-flannel
node2	192.168.199.202	1.18.3	19.03.9	etcd v3.4.14	kubelet、kube-proxy、kube-flannel

1.2 准备工作

1.2.1 关闭防火墙

systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld

1.2.2 设置主机名

hostnamectl set-hostname master
hostnamectl set-hostname node1
hostnamectl set-hostname node2

1.2.3 关闭selinux

sed -i 's/enforcing/disabled/' /etc/selinux/config   永久
setenforce 0 临时
getenforce 查看当前selinux 状态

1.2.4 关闭swap分区

sed -ri 's/.*swap.*/#&/' /etc/fstab  注释swap行
swapoff -a 临时关闭 重启无效
 lsblk 查看swap关闭情况

1.2.5 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
# 生效
sysctl --system

1.2.6 k8s-master执行: 推荐dns解析

cat >> /etc/hosts << EOF
192.168.199.200 master
192.168.199.201 node1
192.168.199.202 node2
EOF

2. 安装etcd集群

https://github.com/etcd-io/etcd/releases

2.1 cfssl 生成证书用户etcd之间通讯

2.1.1 下载cfssl

cat > etcdssl.sh <<EOF
 wget -O /usr/local/bin/cfssl   https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
 wget -O /usr/local/bin/cfssljson  https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
 wget -O /usr/local/bin/cfssl-certinfo https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
 chmod +x /usr/local/bin/cfssl*
EOF
bash -x etcdssl.sh

2.1.2 下载cfssl 的CA

导出默认配置
mkdir tls/etcd -p && cd tls/etcd 
cfssl print-defaults config > ca-config.json
cfssl print-defaults csr > ca-csr.json

[root@master etcd]# cat ca-config.json 
{
    "signing": {
        "default": {
            "expiry": "175200h"
        },
        "profiles": {
            "kubernetes": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
            "client auth"
                ]
            },
        "client": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "etcd": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
            "server auth",
                    "client auth"
                ]
            }
        }
    }
}

[root@master etcd]# cat ca-csr.json 
{
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "SZ",
            "ST": "GD",
        "O": "etcd",
            "OU": "System"
        }
    ]
}

 cfssl gencert --initca ca-csr.json |cfssljson --bare ca  生成ca公钥私钥
[root@master etcd]# ll
总用量 20
-rw-r--r-- 1 root root 579 1月  18 17:18 ca-config.json
-rw-r--r-- 1 root root 408 1月  18 17:21 ca.csr
-rw-r--r-- 1 root root 202 1月  18 17:19 ca-csr.json
-rw------- 1 root root 227 1月  18 17:21 ca-key.pem
-rw-r--r-- 1 root root 704 1月  18 17:21 ca.pem

2.1.3 使用cfssl生成etcd证书 ca签名

[root@master etcd]# cat etcd-csr.json 
{
    "CN": "etcd",
    "hosts": [
      "127.0.0.1",
      "192.168.199.200",
      "192.168.199.201",
      "192.168.199.202",
      "localhost"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "GD",
            "L": "SZ",
            "O": "etcd",
            "OU": "System"
        }
    ]
}

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd  生成etcd证书
[root@master ~]# ll tls/etcd/etcd*
-rw-r--r-- 1 root root 1094 1月  18 20:42 tls/etcd/etcd.csr
-rw-r--r-- 1 root root  429 1月  18 17:39 tls/etcd/etcd-csr.json
-rw------- 1 root root 1675 1月  18 20:42 tls/etcd/etcd-key.pem
-rw-r--r-- 1 root root 1448 1月  18 20:42 tls/etcd/etcd.pem

附：数字证书中主题(Subject)中字段的含义
一般的数字证书产品的主题通常含有如下字段：
公用名称 (Common Name) 简称：CN 字段，对于 SSL 证书，一般为网站域名；而对于代码签名证书则为申请单位名称；而对于客户端证书则为证书申请者的姓名；
组织名称,公司名称(Organization Name) 简称：O 字段，对于 SSL 证书，一般为网站域名；而对于代码签名证书则为申请单位名称；而对于客户端单位证书则为证书申请者所在单位名称；
组织单位名称，公司部门(Organization Unit Name) 简称：OU字段

证书申请单位所在地
所在城市 (Locality) 简称：L 字段
所在省份 (State/Provice) 简称：S 字段，State：州，省
所在国家 (Country) 简称：C 字段，只能是国家字母缩写，如中国：CN

2.2 安装etcd集群注意三个节点etcd服务必须同时启动不然会启动不成功

2.2.1 下载etcd文件

wget https://github.com/etcd-io/etcd/releases/download/v3.4.14/etcd-v3.4.14-linux-amd64.tar.gz
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar xf etcd-v3.4.14-linux-amd64.tar.gz
mv etcd-v3.4.14-linux-amd64{etcd,etcdctl} /opt/etcd/bin/            将命令复制bin下
cp /root/tls/etcd/ca*pem /root/tls/etcd/etcd*pem /opt/etcd/ssl/     将证书复制ssl下

2.2.2 etcd配置文件

 cat > /opt/etcd/cfg/etcd.conf <<EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="https://0.0.0.0:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.199.200:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.199.200:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.199.200:2380,etcd-2=https://192.168.199.201:2380,etcd-3=https://192.168.199.202:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
scp -r /opt/etcd/ root@192.168.199.201:/opt/
scp -r /opt/etcd/ root@192.168.199.202:/opt/
其他node节点 修改下面配置
ETCD_NAME="etcd-1" 名称不重复
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.199.200:2380" 修改成当前IP
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.199.200:2379"  修改成当前IP

node2 
cat > /opt/etcd/cfg/etcd.conf <<EOF
#[Member]
ETCD_NAME="etcd-2"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="https://0.0.0.0:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.199.201:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.199.201:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.199.200:2380,etcd-2=https://192.168.199.201:2380,etcd-3=https://192.168.199.202:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

node3
cat > /opt/etcd/cfg/etcd.conf <<EOF
#[Member]
ETCD_NAME="etcd-3"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="https://0.0.0.0:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.199.202:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.199.202:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.199.200:2380,etcd-2=https://192.168.199.201:2380,etcd-3=https://192.168.199.202:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

解释：
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

2.2.3 etcd配置systemctl服务

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

2.2.4 etcd服务启动验证

scp /usr/lib/systemd/system/etcd.service root@192.168.199.201:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/etcd.service root@192.168.199.202:/usr/lib/systemd/system/
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd
验证结果 集群证书为自签发，所以这里需要加上–insecure-skip-tls-verify参数
[root@master bin]# /opt/etcd/bin/etcdctl --cert /opt/etcd/ssl/etcd.pem --key /opt/etcd/ssl/etcd-key.pem  --endpoints https://192.168.199.200:2379 --insecure-skip-tls-verify  member list
954476b54f2f4aab, started, etcd-2, https://192.168.199.201:2380, https://192.168.199.201:2379, false
ad08ee1a5acf70e4, started, etcd-1, https://192.168.199.200:2380, https://192.168.199.200:2379, false
d2f99c5e160a7e22, started, etcd-3, https://192.168.199.202:2380, https://192.168.199.202:2379, false
[root@master bin]# /opt/etcd/bin/etcdctl --cert /opt/etcd/ssl/etcd.pem --key /opt/etcd/ssl/etcd-key.pem  --endpoints "https://192.168.199.200:2379,https://192.168.199.201:2379,https://192.168.199.202:2379" --insecure-skip-tls-verify  endpoint health
https://192.168.199.202:2379 is healthy: successfully committed proposal: took = 8.857038ms
https://192.168.199.200:2379 is healthy: successfully committed proposal: took = 9.998478ms
https://192.168.199.201:2379 is healthy: successfully committed proposal: took = 10.316648ms

注意服务启动失败后 需要将缓存删除后再次启动 通过 /var/log/message 或 journalctl -u etcd 排错
systemctl stop etcd
rm -rf /var/lib/etcd/default.etcd
systemctl start etcd

3. 部署docker 、Flannel网络

3.1 部署docker

https://download.docker.com/linux/static/stable/x86_64/

wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.9.tgz
tar xf docker-19.03.9.tgz
mv docker/* /usr/bin/

添加system 服务
cat >/usr/lib/systemd/system/docker.service <<EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP \$MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0 Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3 StartLimitInterval=60s

[Install]
WantedBy=multi-user.target
EOF

mkdir -p /etc/docker
cat >/etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
systemctl daemon-reload 
systemctl start docker
systemctl enable docker

3.2部署Flannel网络

/opt/etcd/bin/etcdctl \
--ca-file=ca.pem --cert-file=etcd.pem --key-file=etcd-key.pem \
--endpoints="https://192.168.99.200:2379,https://192.168.99.201:2379,https://192.168.99.202:2379 \
set /coreos.com/network/config  '{ "Network": "172.17.0.0/16", "Backend": {"Type":"vxlan"}}'

 wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
 tar zxvf flannel-v0.9.1-linux-amd64.tar.gz
mv flanneld mk-docker-opts.sh /opt/kubernetes/bin

cat /opt/kubernetes/cfg/flanneld 
FLANNEL_OPTIONS="
-endpoints="https://192.168.99.200:2379,https://192.168.99.201:2379,https://192.168.99.202:2379
-etcd-cafile=/opt/etcd/ssl/ca.pem 
-etcd-certfile=/opt/etcd/ssl/server.pem 
-etcdkeyfile=/opt/etcd/ssl/server-key.pem"

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

[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[install]
WantedBy=multi-user.target

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

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0 Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3 StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

 systemctl daemon-reload
systemctl start flanneld
systemctl enable flanneld
systemctl restart docker

4. 部署 kube-apiserver

4.1 生成 kube-apiserver证书

[root@master etcd]# vim apiserver-csr.json 
{
    "CN": "kubernetes",
    "hosts": [
      "127.0.0.1",
      "192.168.199.200",
      "192.168.199.201",
      "192.168.199.202",
      "localhost",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "GD",
            "L": "SZ",
            "O": "etcd",
            "OU": "System"
        }
    ]
}

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

4.2 安装 kube-apiserver服务

4.2.1 下载kube-apiserver 复制证书

https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.18.md#v1183
wget https://dl.k8s.io/v1.18.3/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/
cp /root/tls/etcd/ca*pem /opt/kubernetes/ssl/
cp /root/tls/etcd/api*pem /opt/kubernetes/ssl/

4.2.2 kube-apiserver配置文件

cat >/opt/kubernetes/cfg/kube-apiserver.conf <<EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://192.168.199.200:2379,https://192.168.199.201:2379,https://192.168.199.202:2379 \\
--bind-address=192.168.199.200 \\
--secure-port=6443 \\
--advertise-address=192.168.199.200 \\
--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/apiserver.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/apiserver-key.pem \\
--tls-cert-file=/opt/kubernetes/ssl/apiserver.pem \\
--tls-private-key-file=/opt/kubernetes/ssl/apiserver-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/etcd.pem \\
--etcd-keyfile=/opt/etcd/ssl/etcd-key.pem \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF

解释：
注：上面两个\ \ 第一个是转义符，第二个是换行符，使用转义符是为了使用EOF保留换行符。
–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

4.2.3 kube-apiserver服务

 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

4.2.4 kube-apiserver服务启动

cat > /opt/kubernetes/cfg/token.csv <<EOF
r9X8Te9pCyDaR4KGBqgxOQnmu34oOQQMWUcyDGHYyQc=,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
head -c 32 /dev/urandom | base64  生成
r9X8Te9pCyDaR4KGBqgxOQnmu34oOQQMWUcyDGHYyQc=

systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver

验证 ss -lntup 是否打开8080 6443端口

4.2.5 授权kubelet-bootstrap 用户允许请求证书

kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap

5. 部署 kube-controller-manager

5.1 创建配置文件

 cat > /opt/kubernetes/cfg/kube-controller-manager.conf  <<EOF
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"
EOF

解释：
–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

5.2 创建配置文件

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/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
systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager

6. 部署 kube-scheduler

6.1 创建配置文件

cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
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"
EOF

解释：
–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）

6.2 创建配置文件

cat > /usr/lib/systemd/system/kube-scheduler.service <<EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler

7. 查看集群的状态

root@master cfg]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-2               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}

8.node节点配置首先在master节点执行下面全部在master节点

8.1 准备复制文件

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
cd /opt/kubernetes/bin
cp kubelet kube-proxy /opt/kubernetes/bin

8.2 准备配置文件

cat > /opt/kubernetes/cfg/kubelet.conf << EOF
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"
EOF

--hostname-override=名字修改下 
–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

 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

[root@master ~]# cat /root/kubernetes/server/bin/boot.sh
KUBE_APISERVER="https://192.168.199.200:6443" # apiserver IP:PORT
TOKEN="r9X8Te9pCyDaR4KGBqgxOQnmu34oOQQMWUcyDGHYyQc=" # 与token.csv里保持一致
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

bash boot.sh
cp bootstrap.kubeconfig /opt/kubernetes/cfg

8.3 准备 kubelet 服务

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
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet

9. 批准 kubelet 证书申请并加入集群 master节点

 查看请求的节点信息
kubectl get csr  
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
node-csr--YzBg8KDaR7VOawPv0mh4MlXp6-FcS1GjDjj8VYSay8   3s    kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
批准请求的节点信息
kubectl certificate approve node-csr--YzBg8KDaR7VOawPv0mh4MlXp6-FcS1GjDjj8VYSay8
查看节点的信息
kubectl get nodes  查看节点信息

10. 部署kube-proxy

10.1准备证书文件

[root@master etcd]# cat kubeproxy-csr.json 
{
    "CN": "system:kubeproxy",
    "hosts": [],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "GD",
            "L": "SZ",
            "O": "etcd",
            "OU": "System"
        }
    ]
}

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kubeproxy-csr.json | cfssljson -bare kubeproxy 
cp -a kube-proxy-key.pem  kube-proxy.pem /opt/kubernetes/ssl/

10.2准备配置文件

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

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: master
clusterCIDR: 10.0.0.0/24
EOF
注意 需要修改 hostnameOverride: master

生成kubeconfig文件：
cd /opt/kubernetes/ssl/
vim kubeconfig.sh 

KUBE_APISERVER="https://192.168.199.200:6443"
# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig
# 设置客户端认证参数
kubectl config set-credentials kube-proxy \
  --client-certificate=./kubeproxy.pem \
  --client-key=./kubeproxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig
# 设置上下文参数
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig
# 设置默认上下文
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

bash kubeconfig.sh
cp -p kube-proxy.kubeconfig /opt/kubernetes/cfg/

10.3 准备kube-proxy服务

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
systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy

11.授权apiserver访问kubelet 部署flannel

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

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
dokcer pull quay.io/coreos/flannel:v0.13.1-rc1
kubectl describe pod kubernetes-dashboard-669f9bbd46-dph47 查看报错信息
kubectl apply -f kube-flannel.yml
kubectl get pods -n kube-system
kubectl get node
kubectl apply -f apiserver-to-kubelet-rbac.yaml

12. node1 node2其他节点配置

master节点执行：
scp -r /opt/kubernetes root@192.168.199.202:/opt/
scp -r /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.199.202:/usr/lib/systemd/system
scp -r /opt/cni/ root@192.168.199.202:/opt/
scp /opt/kubernetes/ssl/ca.pem root@192.168.199.202:/opt/kubernetes/ssl

node 节点
rm -rf /opt/kubernetes/cfg/kubelet.kubeconfig 
rm -rf /opt/kubernetes/ssl/kubelet*
vim /opt/kubernetes/cfg/kubelet.conf
--hostname-override=node02 \
vim /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: node02
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
systemctl start kube-proxy
systemctl enable kube-proxy

master节点执行：
kubectl get csr  查询请求证书
kubectl certificate approve node-csr-0DtEBhq1x-Yh_1NuM4zso0-HpMGoPStb0i8KffFhGyg 同意
kubectl get pods -n kube-system -o wide
[root@master etcd]# kubectl get nodes 查看状态
NAME             STATUS   ROLES    AGE   VERSION
node01           Ready    <none>   28m   v1.18.3
master           Ready    <none>   44m   v1.18.3
node02           Ready    <none>   23m   v1.18.3