二进制安装Kubernetes高可用集群(上)

2023-09-23 16:16:45

一、服务器配置环境

192.168.20.41 k8s-master

192.168.20.42 k8s-node1

192.168.20.43 k8s-node2

二、master节点上配置证书

1、准备cfssl证书生成工具

在Master节点

[root@k8s-master ~]#more /etc/hosts

192.168.20.41 k8s-master

192.168.20.42 k8s-node1

192.168.20.43 k8s-node2

192.168.20.41 etcd-1

192.168.20.42 etcd-2

192.168.20.43 etcd-3

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

[root@k8s-master ~]# chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64

[root@k8s-master ~]# mv cfssl_linux-amd64 /usr/local/bin/cfssl

[root@k8s-master ~]# mv cfssljson_linux-amd64 /usr/local/bin/cfssljson

[root@k8s-master ~]# mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo

2、生成Etcd证书

1. 签证书颁发机构（CA）

创建工作目录：

[root@k8s-master ~]# mkdir -p ~/tsl/{etcd,k8s}

[root@k8s-master ~]# cd tsl/etcd/

[root@k8s-master etcd]# cat > ca-config.json << EOF

> {

> "signing": {

> "default": {

> "expiry": "87600h"

> },

> "profiles": {

> "www": {

> "expiry": "87600h",

> "usages": [

> "signing",

> "key encipherment",

> "server auth",

> "client auth"

> ]

> }

> EOF

[root@k8s-master etcd]# cat > ca-csr.json << EOF

> {

> "CN": "etcd CA",

> "key": {

> "algo": "rsa",

> "size": 2048

> },

> "names": [

> {

> "C": "CN",

> "L": "Beijing",

> "ST": "Beijing"

> }

> ]

> }

> EOF

3、生成证书：

[root@k8s-master etcd]# ls

ca-config.json ca-csr.json

[root@k8s-master etcd]# cfssl gencert -initca ca-csr.json |cfssljson -bare ca -

2020/12/27 14:10:26 [INFO] generating a new CA key and certificate from CSR

2020/12/27 14:10:26 [INFO] generate received request

2020/12/27 14:10:26 [INFO] received CSR

2020/12/27 14:10:26 [INFO] generating key: rsa-2048

2020/12/27 14:10:26 [INFO] encoded CSR

2020/12/27 14:10:27 [INFO] signed certificate with serial number 695386223963361134699949235237569629999190885216

3.1、使用自签CA签发Etcd HTTPS证书

[root@k8s-master etcd]# cat > server-csr.json << EOF

{

"CN": "etcd",

"hosts": [

"192.168.20.41",

"192.168.20.42",

"192.168.20.43"

"key": {

"algo": "rsa",

"size": 2048

"names": [

{

"C": "CN",

"L": "BeiJing",

"ST": "BeiJing"

}

]

}

EOF

3.2、生成证书

[root@k8s-master etcd]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

2020/12/27 14:25:34 [INFO] generate received request

2020/12/27 14:25:34 [INFO] received CSR

2020/12/27 14:25:34 [INFO] generating key: rsa-2048

2020/12/27 14:25:34 [INFO] encoded CSR

2020/12/27 14:25:34 [INFO] signed certificate with serial number 647470747500960226606663959217424414433378131770

2020/12/27 14:25:34 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for

websites. For more information see the Baseline Requirements for the Issuance and Management

of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);

specifically, section 10.2.3 ("Information Requirements").

三、部署Etcd集群

1、解压文件

[root@k8s-master ~]# mkdir /opt/etcd/{bin,cfg,ssl} -p

[root@k8s-master ~]# tar -zxvf etcd-v3.3.13-linux-amd64.tar.gz

配置启动文件

[root@k8s-master etcd-v3.3.13-linux-amd64]# ll

总用量 29776

drwxr-xr-x 10 mysql mysql 4096 5月 3 2019 Documentation

-rwxr-xr-x 1 mysql mysql 16927136 5月 3 2019 etcd

-rwxr-xr-x 1 mysql mysql 13498880 5月 3 2019 etcdctl

-rw-r--r-- 1 mysql mysql 38864 5月 3 2019 README-etcdctl.md

-rw-r--r-- 1 mysql mysql 7262 5月 3 2019 README.md

-rw-r--r-- 1 mysql mysql 7855 5月 3 2019 READMEv2-etcdctl.md

[root@k8s-master etcd-v3.3.13-linux-amd64]# mv etcd /opt/etcd/bin/

[root@k8s-master etcd-v3.3.13-linux-amd64]# mv etcdctl /opt/etcd/bin/

2、创建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://192.168.20.41:2380"

ETCD_LISTEN_CLIENT_URLS="https://192.168.20.41:2379"

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.20.41:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.20.41:2379"

ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.20.41:2380,etcd-2=https://192.168.20.42:2380,etcd-3=https://192.168.20.43:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

EOF

3、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

[root@k8s-master etcd-v3.3.13-linux-amd64]# more /usr/lib/systemd/system/etcd.service

[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-fi

le=/opt/etcd/ssl/server.pem --peer-key-file=/opt/etcd/ssl/server-key.pem --trusted-ca-file=/opt/etcd/ssl/ca.pem --peer-t

rusted-ca-file=/opt/etcd/ssl/ca.pem --logger=zap

Restart=on-failure

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

4、拷贝刚生成的证书到etcd路径下

[root@k8s-master ~]# cp /root/tsl/etcd/ca*pem /opt/etcd/ssl/

[root@k8s-master ~]# cp /root/tsl/etcd/server*pem /opt/etcd/ssl/

[root@k8s-master ~]# cd /opt/etcd/ssl/

[root@k8s-master ssl]# ll

5、把etcd的配置文件分发到其它两个节点（etcd-2,etcd-3）

[root@k8s-master ~]# scp -r /opt/etcd/ root@192.168.20.42:/opt/

6、etcd-2操作：

[root@k8s-node1 ~]# more /usr/lib/systemd/system/etcd.service

[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 --name=etcd-2 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.20.

42:2380 --listen-client-urls=https://192.168.20.42:2379 --advertise-client-urls=https://192.168.20.42:2379 --initial-adv

ertise-peer-urls=https://192.168.20.42:2380 --initial-cluster=etcd-1=https://192.168.20.41:2380,etcd-2=https://192.168.2

0.42:2380,etcd-3=https://192.168.20.43:2380 --initial-cluster-token=etcd-cluster --initial-cluster-state=new --cert-fil

e=/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

Restart=on-failure

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

同理etcd-3 也和etcd-2操作一样

7、查看集群状态

[root@k8s-master ~]# ETCDCTL_API=3 /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://192.168.20.41:2379,https://192.168.20.42:2379,https://192.168.20.43:2379" endpoint health

https://192.168.20.41:2379 is healthy: successfully committed proposal: took = 8.927579ms

https://192.168.20.43:2379 is healthy: successfully committed proposal: took = 4.209997ms

https://192.168.20.42:2379 is healthy: successfully committed proposal: took = 4.947391ms

####################### 以上etcd 集群安装完成#############################

四、安装Docker（所有节点都要安装）

yum -y install docker-ce

五、部署Master Node

生成kube-apiserver证书

1. 签证书颁发机构（CA）

[root@k8s-master k8s]# pwd

/root/tls/k8s

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：

[root@k8s-master k8s~]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

[root@k8s-master k8s ~]# ls *pem

ca-key.pem ca.pem

1. 使用自签CA签发kube-apiserver HTTPS证书

创建证书申请文件：

[root@k8s-master k8s]# pwd

/root/tls/k8s

cat > server-csr.json << EOF

{

"CN": "kubernetes",

"hosts": [

"10.0.0.1",

"127.0.0.1",

"192.168.20.41",

"192.168.20.42",

"192.168.20.43",

"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"

}

]

}

EOF

生成证书：

[root@k8s-master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

[root@k8s-master k8s]# ls server*pem

server-key.pem server.pem

六、部署kube-apiserver

[root@k8s-master ~]# mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}

[root@k8s-master ~]# tar -zxvf kubernetes-server-linux-amd64.tar.gz

[root@k8s-master bin]# pwd

/root/kubernetes/server/bin

[root@k8s-master bin]# cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin

[root@k8s-master bin]# cp kubectl /usr/bin/

1. 创建配置文件

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

KUBE_APISERVER_OPTS="--logtostderr=false \\

--v=2 \\

--log-dir=/opt/kubernetes/logs \\

--etcd-servers=https://192.168.20.41:2379,https://192.168.20.42:2379,https://192.168.20.33:2379 \\

--bind-address=192.168.20.41 \\

--secure-port=6443 \\

--advertise-address=192.168.20.41 \\

--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"

EOF

2.拷贝刚生成的证书

把刚才生成的证书拷贝到配置文件中的路径：

[root@k8s-master ~]# cp tls/k8s/ca*pem tls/k8s/server*pem /opt/kubernetes/ssl/

3. 配置文件中token文件

[root@k8s-master ~]# cat > /opt/kubernetes/cfg/token.csv << EOF

> c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper"

> EOF

4. 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

5. 启动并设置开机启动

[root@k8s-master ~]# systemctl daemon-reload

[root@k8s-master ~]# systemctl start kube-apiserver

[root@k8s-master ~]# systemctl enable kube-apiserver

1. 授权kubelet-bootstrap用户允许请求证书

[root@k8s-master ~]# kubectl create clusterrolebinding kubelet-bootstrap \

> --clusterrole=system:node-bootstrapper \

> --user=kubelet-bootstrap

clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

七、部署kube-controller-manager

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

2.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

3.启动并设置开机启动

[root@k8s-master ~]# systemctl daemon-reload

[root@k8s-master ~]# systemctl start kube-controller-manager

[root@k8s-master ~]# systemctl enable kube-controller-manager

八、部署kube-scheduler

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

2.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

3.启动并设置开机启动

[root@k8s-master ~]# systemctl daemon-reload

[root@k8s-master ~]# systemctl start kube-scheduler

[root@k8s-master ~]# systemctl enable kube-scheduler

4.查看集群状态

[root@k8s-master ~]# kubectl get cs

NAME ERROR STATUS MESSAGE

scheduler Healthy ok

etcd-0 Healthy {"health":"true"}

controller-manager Healthy ok

etcd-1 Healthy {"health":"true"}

etcd-2 Healthy {"health":"true"}

二进制安装Kubernetes高可用集群(下)，未完继续关注！

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