一、环境准备
| 主机名 | IP | 部署应用 |
|---|---|---|
| cnsz-fbu-bck8s-master01-uat | 10.81.0.101 | kubeadm, kubectl, kubelet, docker, apiserver, controllerManager, scheduler, helm |
| cnsz-fbu-bck8s-master02-uat | 10.81.0.102 | kubeadm, kubectl, kubelet, docker, apiserver, controllerManager, scheduler |
| cnsz-fbu-bck8s-master03-uat | 10.81.0.103 | kubeadm, kubectl, kubelet, docker, apiserver, controllerManager, scheduler |
| cnsz-fbu-bck8s-node01-uat | 10.81.0.104 | kubeadm, kubelet, docker, kubeproxy |
| cnsz-fbu-bck8s-node02-uat | 10.81.0.105 | kubeadm, kubelet, docker, kubeproxy |
| cnsz-fbu-etcd01-uat | 10.81.64.37 vip：10.81.64.110 |
etcd, nginx, keepalived |
| cnsz-fbu-etcd02-uat | 10.81.64.38 | etcd, nginx, keepalived |
| cnsz-fbu-etcd03-uat | 10.81.64.39 | etcd |
升级内核版本到4.0以上，设置docker存储驱动为overlay2需要内核版本高于4.0。
yum -y install http://192.168.73.43/soft/kernel-4.9.86-30.el7.x86_64.rpm
awk -F "'" '$1=="menuentry "{print $2}' /etc/grub2.cfg
cat >>/etc/rc.local <<'EOF'
grub2-set-default 'CentOS Linux (4.9.86-30.el7.x86_64) 7 (Core)'
EOF
reboot
uname -r
关闭swap交换空间，swapoff -a，然后在/etc/fstab文件下删除swap项。
在安全内网环境时，关闭防火墙服务。
systemctl stop firewalld
systemctl disable firewalld
禁用SELinux，让容器可以读取主机文件系统
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
确保每个节点上的MAC地址和product_uuid是唯一的
ip a
cat /sys/class/dmi/id/product_uuid
允许iptables检查桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
设置kubectl命令补全功能
yum -y install bash-completion
echo "source <(kubectl completion bash)" >> ~/.bash_profile
source /etc/profile.d/bash_completion.sh
source /root/.bash_profile
设置host解析
cat >> /etc/hosts <<'EOF'
10.81.0.101 cnsz-fbu-bck8s-master01-uat
10.81.0.102 cnsz-fbu-bck8s-master02-uat
10.81.0.103 cnsz-fbu-bck8s-master03-uat
10.81.0.104 cnsz-fbu-bck8s-node01-uat
10.81.0.105 cnsz-fbu-bck8s-node02-uat
10.81.64.110 apiserver
EOF
二、使用kubeadm工具安装
1、安装容器运行时docker
<!== 所有k8s主机执行 ==>
-
卸载旧版本
yum -y remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine -
安装docker
yum install -y yum-utils yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo yum list docker-ce --showduplicates | sort -r yum -y install docker-ce-18.09.9-3.el7 docker-ce-cli-18.09.9-3.el7 containerd.io docker-compose-plugin -
设置docker
mkdir /etc/docker mkdir -p /data/docker/data cat > /etc/docker/daemon.json <<'EOF' { "registry-mirrors": ["https://xigwl1gq.mirror.aliyuncs.com"], "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "200m", "max-file": "7" }, "data-root": "/data/docker/data", "storage-driver": "overlay2", "storage-opts": ["overlay2.override_kernel_check=true"], "dns": ["192.168.94.94", "192.168.94.95", "192.168.109.104"] } EOF cat >> /etc/sysctl.conf <<'EOF' net.ipv4.conf.all.forwarding = 1 EOF sysctl -p -
启动docker
systemctl start docker systemctl enable docker
2、安装外部ETCD集群
-
下载etcd二进制文件
<!== 所有etcd主机执行 ==>
mkdir -p /data/svc cd /usr/local/src && wget https://github.com/etcd-io/etcd/releases/download/v3.4.18/etcd-v3.4.18-linux-amd64.tar.gz tar zxf etcd-v3.4.18-linux-amd64.tar.gz -C /data/svc cd /data/svc mv etcd-v3.4.18-linux-amd64 etcd-v3.4.18 -
使用TLS协议加密通信
在
etcd01主机上，下载cfssl工具wget -O /usr/bin/cfssl "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" wget -O /usr/bin/cfssljson "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" chmod a+x /usr/bin/cfssl*生成CA证书
mkdir -p /data/certs/etcd cat > /data/certs/etcd/ca-config.json <<'EOF' { "signing": { "default": { "expiry": "876000h" }, "profiles": { "server": { "expiry": "876000h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] }, "client": { "expiry": "876000h", "usages": [ "signing", "key encipherment", "client auth" ] }, "peer": { "expiry": "876000h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF cat > /data/certs/etcd/ca-csr.json <<'EOF' { "CN": "etcd", "key": { "algo": "rsa", "size": 2048 } } EOF cd /data/certs/etcd && cfssl gencert -initca ca-csr.json | cfssljson -bare ca -生成服务器证书及对等证书
cat > /data/certs/etcd/server.json <<'EOF' { "CN": "etcd", "hosts": [ "127.0.0.1", "10.81.64.37", "10.81.64.38", "10.81.64.39" ], "key": { "algo": "ecdsa", "size": 256 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server server.json | cfssljson -bare server cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer server.json | cfssljson -bare peer生成客户端证书
cat > /data/certs/etcd/client.json <<'EOF' { "CN": "client", "hosts": [""], "key": { "algo": "ecdsa", "size": 256 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client.json | cfssljson -bare client分发相关证书
#etcd02/etcd03主机创建目录 mkdir /data/certs rsync -avzP -e "ssh -p 60025" /data/certs/etcd 10.81.64.38:/data/certs/ rsync -avzP -e "ssh -p 60025" /data/certs/etcd 10.81.64.39:/data/certs/ #k8s master主机创建目录 mkdir -p /data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/client*.pem 10.81.0.101:/data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/client*.pem 10.81.0.102:/data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/client*.pem 10.81.0.103:/data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/ca.pem 10.81.0.101:/data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/ca.pem 10.81.0.102:/data/certs/etcd rsync -avzP -e "ssh -p 60025" /data/certs/etcd/ca.pem 10.81.0.103:/data/certs/etcd -
修改配置文件
<!== 所有etcd主机执行 ==>
mkdir -p /data/etcd/conf mkdir -p /data/etcd/data cat > /data/etcd/conf/etcd.conf.yml <<'EOF' # 集群节点名称，对应修改 name: 'etcd01' # Path to the data directory. data-dir: '/data/etcd/data' # Number of committed transactions to trigger a snapshot to disk. snapshot-count: 50000 # Time (in milliseconds) of a heartbeat interval. heartbeat-interval: 100 # Time (in milliseconds) for an election to timeout. election-timeout: 1000 # Raise alarms when backend size exceeds the given quota. 0 means use the # default quota. quota-backend-bytes: 8589934592 # List of comma separated URLs to listen on for peer traffic.修改对应IP listen-peer-urls: https://10.81.64.37:2380 # List of comma separated URLs to listen on for client traffic.修改对应IP listen-client-urls: https://10.81.64.37:2379 # Maximum number of snapshot files to retain (0 is unlimited). max-snapshots: 5 max-request-bytes: 10485760 # Maximum number of wal files to retain (0 is unlimited). max-wals: 5 # Comma-separated white list of origins for CORS (cross-origin resource sharing). cors: # List of this member's peer URLs to advertise to the rest of the cluster. # The URLs needed to be a comma-separated list.修改对应IP initial-advertise-peer-urls: https://10.81.64.37:2380 # List of this member's client URLs to advertise to the public. # The URLs needed to be a comma-separated list.修改对应IP advertise-client-urls: https://10.81.64.37:2379 # Discovery URL used to bootstrap the cluster. discovery: # Valid values include 'exit', 'proxy' discovery-fallback: 'proxy' # HTTP proxy to use for traffic to discovery service. discovery-proxy: # DNS domain used to bootstrap initial cluster. discovery-srv: # Initial cluster configuration for bootstrapping. initial-cluster: 'etcd01=https://10.81.64.37:2380,etcd02=https://10.81.64.38:2380,etcd03=https://10.81.64.39:2380' # Initial cluster token for the etcd cluster during bootstrap. initial-cluster-token: 'etcd-cluster' # Initial cluster state ('new' or 'existing'). initial-cluster-state: 'new' # Reject reconfiguration requests that would cause quorum loss. strict-reconfig-check: false # Enable runtime profiling data via HTTP server enable-pprof: true # Valid values include 'on', 'readonly', 'off' proxy: 'off' # Time (in milliseconds) an endpoint will be held in a failed state. proxy-failure-wait: 5000 # Time (in milliseconds) of the endpoints refresh interval. proxy-refresh-interval: 30000 # Time (in milliseconds) for a dial to timeout. proxy-dial-timeout: 1000 # Time (in milliseconds) for a write to timeout. proxy-write-timeout: 5000 # Time (in milliseconds) for a read to timeout. proxy-read-timeout: 0 client-transport-security: # Path to the client server TLS cert file. cert-file: '/data/certs/etcd/server.pem' # Path to the client server TLS key file. key-file: '/data/certs/etcd/server-key.pem' # Enable client cert authentication. client-cert-auth: true # Path to the client server TLS trusted CA cert file. trusted-ca-file: '/data/certs/etcd/ca.pem' # Client TLS using generated certificates auto-tls: false peer-transport-security: # Path to the peer server TLS cert file. cert-file: '/data/certs/etcd/peer.pem' # Path to the peer server TLS key file. key-file: '/data/certs/etcd/peer-key.pem' # Enable peer client cert authentication. client-cert-auth: true # Path to the peer server TLS trusted CA cert file. trusted-ca-file: '/data/certs/etcd/ca.pem' # Peer TLS using generated certificates. auto-tls: false # The validity period of the self-signed certificate, the unit is year. self-signed-cert-validity: 100 # Enable debug-level logging for etcd. log-level: 'info' logger: zap # Specify 'stdout' or 'stderr' to skip journald logging even when running under systemd. log-outputs: [stderr] # Force to create a new one member cluster. force-new-cluster: false auto-compaction-mode: periodic auto-compaction-retention: "1" EOF -
设置systemd管理
<!== 所有etcd主机执行 ==>
cat > /etc/systemd/system/etcd.service <<'EOF' [Unit] Description=Etcd Server After=network.target After=network-online.target Wants=network-online.target [Service] Type=notify ExecStart=/data/svc/etcd-v3.4.18/etcd --config-file /data/etcd/conf/etcd.conf.yml Restart=on-failure LimitNOFILE=65535 OOMScoreAdjust=-999 [Install] WantedBy=multi-user.target EOF systemctl daemon-relaod systemctl start etcd systemctl enable etcd -
验证集群是否正常
$ /data/svc/etcd-v3.4.18/etcdctl --cacert=ca.pem --cert=server.pem --key=server-key.pem --endpoints="https://10.81.64.37:2379" member list 2259985fb5165391, started, etcd02, https://10.81.64.38:2380, https://10.81.64.38:2379, false 592e58e2927d0458, started, etcd01, https://10.81.64.37:2380, https://10.81.64.37:2379, false d32cce3d601b23ec, started, etcd03, https://10.81.64.39:2380, https://10.81.64.39:2379, false $ /data/svc/etcd-v3.4.18/etcdctl --cacert=ca.pem --cert=server.pem --key=server-key.pem --endpoints="https://10.81.64.37:2379" endpoint health https://10.81.64.37:2379 is healthy: successfully committed proposal: took = 11.013657ms
3、安装Nginx+Keepalived反代apiServer
-
安装nginx
yum -y install nginx nginx-all-modules.noarch -
修改nginx配置文件
user nginx nginx; worker_processes auto; worker_cpu_affinity auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid; # Load dynamic modules. See /usr/share/doc/nginx/README.dynamic. include /usr/share/nginx/modules/*.conf; events { use epoll; accept_mutex off; worker_connections 1024; } stream { upstream apiserver { server 10.81.0.101:6443 max_fails=3 fail_timeout=30s; server 10.81.0.102:6443 max_fails=3 fail_timeout=30s; server 10.81.0.103:6443 max_fails=3 fail_timeout=30s; } log_format nginx-json-log '{"remote_addr":"$remote_addr","time_local":"$time_local","ssl_protocol":"$ssl_protocol","status":"$status","bytes_sent":"$bytes_sent","bytes_received":"$bytes_received","session_time":"$session_time","upstream_addr":"$upstream_addr","upstream_bytes_sent":"$upstream_bytes_sent","upstream_bytes_received":"$upstream_bytes_received","upstream_connect_time":"$upstream_connect_time","ng_server":"$ng_server"}'; server { listen 6443; set $ng_server k8s-apiserver; access_log /var/log/nginx/k8s-apiserver.log nginx-json-log; proxy_connect_timeout 2s; proxy_timeout 600s; proxy_pass apiserver; } } -
启动nginx
systemctl start nginx systemctl enable nginx systemctl status nginx -
安装keepalived软件
yum -y install keepalived -
修改keepalived配置文件
<!== 各节点配置文件不同，对应修改 ==>
cat > /etc/keepalived/keepalived.conf <<'EOF' global_defs { ##标识身份，默认本地主机名,需修改 router_id nginx37 script_user root root enable_script_security } vrrp_script CheckNginx { script "/bin/bash /etc/keepalived/check_nginx.sh" interval 1 weight -20 } vrrp_instance VI_1 { #定义该实例的初始化状态，需修改 state MASTER #对应网卡接口 interface ens192 #实例身份标识要保持一致 virtual_router_id 51 #权重大小，需修改 priority 150 advert_int 1 nopreempt track_script { CheckNginx } authentication { auth_type PASS auth_pass I9OsLmlb } virtual_ipaddress { 10.81.64.110 } } EOF cat > /etc/keepalived/check_nginx.sh <<'EOF' #!/bin/bash if ! pidof nginx >/dev/null 2>&1;then nginx -t && nginx sleep 5 if ! pidof nginx >/dev/null 2>&1;then systemctl stop keepalived fi fi EOF -
启动keepalived
systemctl start keepalived systemctl enable keepalived
4、开启ipvs
-
安装软件工具
<!== 所有k8s节点执行 ==>
yum -y install ipset ipvsadm -
加载模块配置
<!== 所有k8s节点执行 ==>
cat > /etc/sysconfig/modules/ipvs.modules <<EOF #!/bin/bash modprobe -- ip_vs modprobe -- ip_vs_rr modprobe -- ip_vs_wrr modprobe -- ip_vs_sh modprobe -- nf_conntrack_ipv4 EOF chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4
5、安装kubeadm及相关工具
上传修改好证书有效期重新编译的kubeadm命令
<!== 所有master节点执行 ==>
cat >/etc/yum.repos.d/kubernetes.repo <<'EOF'
[kubernetes]
name=Kubernetes Repository
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
EOF
yum makecache fast
yum -y install kubelet-1.19.6-0 kubeadm-1.19.6-0 kubectl-1.19.6-0 --disableexcludes=kubernetes
systemctl enable --now kubelet
替换为重新编译的kubeadm命令
mv /usr/bin/kubeadm{,_bak}
tar zxf kubeadm.tar.gz -C /usr/bin
<!== 所有node节点执行 ==>
cat >/etc/yum.repos.d/kubernetes.repo <<'EOF'
[kubernetes]
name=Kubernetes Repository
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
EOF
yum makecache fast
yum -y install kubelet-1.19.6-0 kubeadm-1.19.6-0 --disableexcludes=kubernetes
systemctl enable --now kubelet
替换为重新编译的kubeadm命令
mv /usr/bin/kubeadm{,_bak}
tar zxf kubeadm.tar.gz -C /usr/bin
6、初始化master01节点
-
编写初始化配置文件
mkdir -p /data/k8s/install mkdir -p /data/certs/kubernetes cat > /data/k8s/install/init-config.yml <<'EOF' apiVersion: kubeadm.k8s.io/v1beta2 kind: InitConfiguration bootstrapTokens: - groups: - system:bootstrappers:kubeadm:default-node-token token: abcdef.0123456789abcdef ttl: 24h0m0s usages: - signing - authentication nodeRegistration: #修改为对应节点主机名 name: cnsz-fbu-bck8s-master01-uat criSocket: "/var/run/dockershim.sock" taints: - effect: NoSchedule key: node-role.kubernetes.io/control-plane localAPIEndpoint: #修改为对应节点IP advertiseAddress: 10.81.0.101 bindPort: 6443 --- apiVersion: kubeadm.k8s.io/v1beta2 kind: ClusterConfiguration etcd: external: endpoints: - "https://10.81.64.37:2379" - "https://10.81.64.38:2379" - "https://10.81.64.39:2379" caFile: "/data/certs/etcd/ca.pem" certFile: "/data/certs/etcd/client.pem" keyFile: "/data/certs/etcd/client-key.pem" networking: dnsDomain: cluster.local serviceSubnet: 10.96.0.0/16 podSubnet: "10.100.0.0/16" kubernetesVersion: "v1.19.6" controlPlaneEndpoint: "apiserver:6443" apiServer: extraArgs: service-node-port-range: "80-65535" certSANs: - cnsz-fbu-bck8s-master01-uat - cnsz-fbu-bck8s-master02-uat - cnsz-fbu-bck8s-master03-uat - cnsz-fbu-bck8s-node01-uat - cnsz-fbu-bck8s-node02-uat - apiserver - 10.81.0.101 - 10.81.0.102 - 10.81.0.103 - 10.81.0.104 - 10.81.0.105 - 10.81.64.110 timeoutForControlPlane: 4m0s controllerManager: extraArgs: experimental-cluster-signing-duration: "876000h" scheduler: {} dns: type: CoreDNS certificatesDir: "/data/certs/kubernetes" imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers clusterName: bc-kubernetes --- apiVersion: kubelet.config.k8s.io/v1beta1 kind: KubeletConfiguration cgroupDriver: "systemd" maxPods: 300 containerLogMaxSize: "100Mi" containerLogMaxFiles: 7 --- apiVersion: kubeproxy.config.k8s.io/v1alpha1 kind: KubeProxyConfiguration clusterCIDR: "10.100.0.0/16" metricsBindAddress: "0.0.0.0:10249" mode: "ipvs" EOF -
拉取组件镜像
cd /data/k8s/install kubeadm config images pull --config init-config.yml docker images -
初始化控制平面
kubeadm init --config init-config.yml #如果初始化报错，要先重置初始化再进行初始化 kubeadm reset kubeadm init --config init-config.yml -
记录加入集群的相关信息
Your Kubernetes control-plane has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config Alternatively, if you are the root user, you can run: export KUBECONFIG=/etc/kubernetes/admin.conf You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of control-plane nodes by copying certificate authorities and service account keys on each node and then running the following as root: kubeadm join apiserver:6443 --token abcdef.0123456789abcdef \ --discovery-token-ca-cert-hash sha256:2b2858a9663dd0be99b8a0d3af941b666b7361d48fc5f9a05eabad140d36373c \ --control-plane Then you can join any number of worker nodes by running the following on each as root: kubeadm join apiserver:6443 --token abcdef.0123456789abcdef \ --discovery-token-ca-cert-hash sha256:2b2858a9663dd0be99b8a0d3af941b666b7361d48fc5f9a05eabad140d36373c -
设置kubeconfig文件的环境变量
echo 'export KUBECONFIG=/etc/kubernetes/admin.conf' >> /etc/profile source /etc/profile -
关闭禁止使用非安全的http接口参数
sed -i 's/- --port=0/#- --port=0/g' /etc/kubernetes/manifests/kube-controller-manager.yaml sed -i 's/- --port=0/#- --port=0/g' /etc/kubernetes/manifests/kube-scheduler.yaml -
检查组件状态
$ kubectl get pods -n kube-system -o wide $ kubectl get nodes $ kubectl get cs Warning: v1 ComponentStatus is deprecated in v1.19+ NAME STATUS MESSAGE ERROR #该不健康状态为正常，不管是否开启http端口，get cs都是使用的非安全的http端口查询 scheduler Unhealthy Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused controller-manager Unhealthy Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused etcd-0 Healthy {"health":"true"} etcd-1 Healthy {"health":"true"} etcd-2 Healthy {"health":"true"}
7、其他master节点加入控制平面集群
-
从master01节点拉取证书
<!== master02/03节点执行 ==>
mkdir -p /data/certs/kubernetes rsync -avzP 10.81.0.101:/data/certs/kubernetes/* /data/certs/kubernetes/ -
设置kubeconfig文件的环境变量
<!== master02/03节点执行 ==>
echo 'export KUBECONFIG=/etc/kubernetes/admin.conf' >> /etc/profile source /etc/profile -
编写加入集群配置文件
<!== master02/03节点执行，需对应修改 ==>
mkdir -p /data/k8s/install cat > /data/k8s/install/join-config.yml <<'EOF' apiVersion: kubeadm.k8s.io/v1beta2 kind: JoinConfiguration nodeRegistration: #修改为对应节点主机名 name: cnsz-fbu-bck8s-master02-uat criSocket: "/var/run/dockershim.sock" taints: - effect: NoSchedule key: node-role.kubernetes.io/control-plane caCertPath: "/data/certs/kubernetes/ca.crt" discovery: bootstrapToken: token: "abcdef.0123456789abcdef" apiServerEndpoint: "apiserver:6443" caCertHashes: - "sha256:2b2858a9663dd0be99b8a0d3af941b666b7361d48fc5f9a05eabad140d36373c" controlPlane: localAPIEndpoint: #修改为对应节点ip advertiseAddress: "10.81.0.102" bindPort: 6443 EOF -
执行命令加入集群
<!== master02/03节点执行 ==>
kubeadm join --config /data/k8s/install/join-config.yml -
关闭禁止使用非安全的http接口参数
<!== master02/03节点执行 ==>
sed -i 's/- --port=0/#- --port=0/g' /etc/kubernetes/manifests/kube-controller-manager.yaml sed -i 's/- --port=0/#- --port=0/g' /etc/kubernetes/manifests/kube-scheduler.yaml systemctl restart kubelet -
检查集群状态
<!== master02/03节点执行 ==>
kubectl get nodes
8、开启PodPreset资源
-
修改apiserver配置文件
<!== 所有master主机执行 ==>
vim /etc/kubernetes/manifests/kube-apiserver.yaml # 修改 - --enable-admission-plugins=NodeRestriction,PodPreset # 新增 - --runtime-config=settings.k8s.io/v1alpha1=true -
重启kubelet
<!== 所有master主机执行 ==>
systemctl restart kubelet
9、worker节点加入集群
-
从master01节点拉取证书
<!== 所有node节点执行 ==>
mkdir -p /data/certs/kubernetes rsync -avzP 10.81.0.101:/data/certs/kubernetes/ca.crt /data/certs/kubernetes/ -
编写加入集群配置文件
<!== 所有node节点执行，需对应修改 ==>
mkdir -p /data/k8s/install cat > /data/k8s/install/join-worker-config.yml <<'EOF' apiVersion: kubeadm.k8s.io/v1beta2 kind: JoinConfiguration nodeRegistration: #修改为对应节点主机名 name: cnsz-fbu-bck8s-node02-uat criSocket: "/var/run/dockershim.sock" discovery: bootstrapToken: token: "abcdef.0123456789abcdef" apiServerEndpoint: "apiserver:6443" caCertHashes: - "sha256:2b2858a9663dd0be99b8a0d3af941b666b7361d48fc5f9a05eabad140d36373c" EOF -
执行命令加入集群
<!== 所有node节点执行 ==>
kubeadm join --config /data/k8s/install/join-worker-config.yml -
如果token过期，使用以下命令重新生成
kubeadm token create --print-join-command
10、安装pod网络插件
<!== 任意master节点执行 ==>
(1)、flannel
-
上传kube-flannel.yml文件
-
修改文件配置
-
启动flannel
kubectl apply -f /data/k8s/install/kube-flannel.yml
(2)、calico
-
下载修改yml文件
<!== master01节点执行 ==>
cd /data/k8s/install wget https://docs.projectcalico.org/archive/v3.19/manifests/calico.yaml -
修改yml文件
<!== master01节点执行 ==>
vim calico.yaml ... # Cluster type to identify the deployment type - name: CLUSTER_TYPE value: "k8s,bgp" # Auto-detect the BGP IP address. - name: IP value: "autodetect" # 关闭IPIP模式，启用BGP模式 - name: CALICO_IPV4POOL_IPIP value: "Always" # Enable or Disable VXLAN on the default IP pool. - name: CALICO_IPV4POOL_VXLAN value: "Never" ... # The default IPv4 pool to create on startup if none exists. Pod IPs will be # chosen from this range. Changing this value after installation will have # no effect. This should fall within `--cluster-cidr # 修改pod网段地址 - name: CALICO_IPV4POOL_CIDR value: "10.100.0.0/16" ... -
如果无法匹配网卡名，可自定义匹配规则
vim calico.yaml ... # Cluster type to identify the deployment type - name: CLUSTER_TYPE value: "k8s,bgp" # IP automatic detection - name: IP_AUTODETECTION_METHOD value: "interface=en.*,eth0" # Auto-detect the BGP IP address. - name: IP value: "autodetect" # 关闭IPIP模式，启用BGP模式 - name: CALICO_IPV4POOL_IPIP value: "Always" # Enable or Disable VXLAN on the default IP pool. - name: CALICO_IPV4POOL_VXLAN value: "Never" ... -
启动calico
<!== master01节点执行 ==>
kubectl apply -f calico.yaml
11、创建一个服务测试
-
编写yaml文件
mkdir /data/k8s/deploy cat > /data/k8s/deploy/nginx-deployment.yml <<'EOF' apiVersion: apps/v1 kind: Deployment metadata: name: nginx labels: app: nginx spec: replicas: 2 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx-demo image: nginx:1.17.6-alpine imagePullPolicy: IfNotPresent ports: - containerPort: 80 EOF cat > /data/k8s/deploy/nginx-service.yml <<'EOF' apiVersion: v1 kind: Service metadata: name: nginx-service spec: type: NodePort ports: - port: 80 nodePort: 32000 selector: app: nginx EOF -
创建资源
kubectl apply -f /data/k8s/deploy/nginx-deployment.yml kubectl apply -f /data/k8s/deploy/nginx-service.yml -
访问页面是否正常
http://10.81.0.105:32000
三、修改证书有效期
1、使用脚本修改证书有效期
该脚本为一位码友编写，https://github.com/yuyicai/update-kube-cert
<!== 所有master节点都是要执行 ==>
-
查看证书有效期
$ kubeadm alpha certs check-expiration [check-expiration] Reading configuration from the cluster... [check-expiration] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED admin.conf Jun 02, 2023 02:31 UTC 364d no apiserver Jun 02, 2023 02:16 UTC 364d ca no apiserver-kubelet-client Jun 02, 2023 02:16 UTC 364d ca no controller-manager.conf Jun 02, 2023 02:31 UTC 364d no front-proxy-client Jun 02, 2023 02:16 UTC 364d front-proxy-ca no scheduler.conf Jun 02, 2023 02:31 UTC 364d no CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED ca May 30, 2032 02:16 UTC 9y no front-proxy-ca May 30, 2032 02:16 UTC 9y no -
下载脚本
cd /usr/local/src git clone https://github.com/yuyicai/update-kube-cert.git cd update-kubeadm-cert chmod 755 update-kubeadm-cert.sh -
修改证书目录及设置有效期
vim update-kubeadm-cert.sh ... main() { local node_type=$1 # CERT_DAYS=3650 CERT_DAYS=36500 KUBE_PATH=/etc/kubernetes # PKI_PATH=${KUBE_PATH}/pki PKI_PATH=/data/certs/kubernetes # master certificates path # apiserver ... -
执行脚本
./update-kubeadm-cert.sh master -
查看证书有效期
$ kubeadm alpha certs check-expiration [check-expiration] Reading configuration from the cluster... [check-expiration] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED admin.conf May 10, 2122 01:54 UTC 99y no apiserver May 10, 2122 01:54 UTC 99y ca no apiserver-kubelet-client May 10, 2122 01:54 UTC 99y ca no controller-manager.conf May 10, 2122 01:54 UTC 99y no front-proxy-client May 10, 2122 01:54 UTC 99y front-proxy-ca no scheduler.conf May 10, 2122 01:54 UTC 99y no CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED ca May 30, 2032 02:16 UTC 9y no front-proxy-ca May 30, 2032 02:16 UTC 9y no
2、修改源码重新编译
-
下载源码
cd /usr/local/src wget https://github.com/kubernetes/kubernetes/archive/refs/tags/v1.19.6.tar.gz tar zxf v1.19.6.tar.gz -
修改源码CA证书有效期时间
cd kubernetes-1.19.6/ vim staging/src/k8s.io/client-go/util/cert/cert.go ... func NewSelfSignedCACert(cfg Config, key crypto.Signer) (*x509.Certificate, error) { now := time.Now() tmpl := x509.Certificate{ SerialNumber: new(big.Int).SetInt64(0), Subject: pkix.Name{ CommonName: cfg.CommonName, Organization: cfg.Organization, }, NotBefore: now.UTC(), // NotAfter: now.Add(duration365d * 10).UTC(), NotAfter: now.Add(duration365d * 100).UTC(), KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign, BasicConstraintsValid: true, IsCA: true, } certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &tmpl, &tmpl, key.Public(), key) if err != nil { return nil, err } return x509.ParseCertificate(certDERBytes) } ... -
修改源码其他证书有效期时间
vim cmd/kubeadm/app/constants/constants.go ... // CertificateValidity defines the validity for all the signed certificates generated by kubeadm // CertificateValidity = time.Hour * 24 * 365 CertificateValidity = time.Hour * 24 * 365 * 100 ... -
查看 kube-cross 的 TAG 版本号
$ cat build/build-image/cross/VERSION v1.15.5-1 -
安装GoLang环境
yum -y install rsync jq gcc make cd /usr/local/src wget https://dl.google.com/go/go1.15.5.linux-amd64.tar.gz tar zxf go1.15.5.linux-amd64.tar.gz export PATH=$PATH:/usr/local/src/go/bin/ -
编译kubeadm
cd /usr/local/src/kubernetes-1.19.6/ make all WHAT=cmd/kubeadm GOFLAGS=-v -
替换kubeadm命令
mv /usr/bin/kubeadm{,_bak} cp _output/local/bin/linux/amd64/kubeadm /usr/bin/ -
更新证书有效期
无法更新CA证书有效期，要更新CA证书需一开始构建集群就使用该重新编译的kubadm命令
cp -rp /data/certs/kubernetes{,_bak} kubeadm alpha certs check-expiration kubeadm alpha certs renew all kubeadm alpha certs check-expiration
四、helm(k8s包管理器)安装
<!== 任意master节点执行 ==>
-
下载二进制包安装
cd /usr/local/src wget https://get.helm.sh/helm-v3.4.2-linux-amd64.tar.gz tar zxf helm-v3.4.2-linux-amd64.tar.gz cp linux-amd64/helm /usr/bin/ -
设置命令补全
echo 'source <(helm completion bash)' >>/root/.bash_profile source /root/.bash_profile -
添加常用的仓库
helm repo add elastic https://helm.elastic.co helm repo add gitlab https://charts.gitlab.io helm repo add harbor https://helm.goharbor.io helm repo add bitnami https://charts.bitnami.com/bitnami helm repo add stable http://mirror.azure.cn/kubernetes/charts helm repo add aliyun https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts helm repo update helm repo list -
验证测试
# 查找仓库里nginx的chart helm search repo nginx # 拉取一个chart并解压 helm pull bitnami/nginx tar zxf nginx-12.0.1.tgz # 修改chart里默认配置值，改为使用国内镜像并修改容器端口 vim nginx/values.yaml ... ## Bitnami NGINX image version ## ref: https://hub.docker.com/r/bitnami/nginx/tags/ ## @param image.registry NGINX image registry ## @param image.repository NGINX image repository ## @param image.tag NGINX image tag (immutable tags are recommended) ## @param image.pullPolicy NGINX image pull policy ## @param image.pullSecrets Specify docker-registry secret names as an array ## @param image.debug Set to true if you would like to see extra information on logs ## image: repository: nginx tag: 1.17.6-alpine ... ## Configures the ports NGINX listens on ## @param containerPorts.http Sets http port inside NGINX container ## @param containerPorts.https Sets https port inside NGINX container ## containerPorts: http: 80 https: "" ... # 安装该chart helm install nginx ./nginx # 访问是否正常 kubectl get pods -o wide kubectl get svc curl http://[cluster_ip] # 卸载chart helm uninstall nginx
五、Ingress Controller安装
1、Ingress Nginx Controller
-
创建kube-system命名空间podpreset
cat > /data/k8s/install/podpreset.yaml <<'EOF' apiVersion: settings.k8s.io/v1alpha1 kind: PodPreset metadata: name: tz-env namespace: kube-system spec: selector: matchLabels: env: - name: TZ value: Asia/Shanghai EOF kubectl apply -f /data/k8s/install/podpreset.yaml -
helm添加仓库
mkdir -p /data/helm/install cd /data/helm/install helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx helm repo update -
拉取ingress-nginx对应版本chart
helm pull ingress-nginx/ingress-nginx --version=4.1.3 tar zxf ingress-nginx-4.1.3.tgz -
将已有证书上传到k8s集群
mkdir -p /data/certs/nginx-ingress cd /data/certs/nginx-ingress kubectl create secret tls nginx-ingress --cert=eminxing.crt --key=eminxing.key -n kube-system -
修改values配置
vim ingress-nginx/values.yaml ... # -- Will add custom configuration options to Nginx https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/ config: use-gzip: true gzip-level: 4 gzip-types: "text/plain text/javascript application/x-javascript application/javascript text/css application/xml" worker-processes: 1 proxy-body-size: "200m" proxy-connect-timeout: 60 proxy-read-timeout: 1800 proxy-send-timeout: 1800 proxy-buffer-size: "256k" # -- Annotations to be added to the controller config configuration configmap. configAnnotations: nginx.ingress.kubernetes.io/enable-cors: "true" nginx.ingress.kubernetes.io/cors-allow-origin: "PUT, GET, POST, OPTIONS" nginx.ingress.kubernetes.io/cors-allow-headers: "DNT,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Forwarded-For" nginx.ingress.kubernetes.io/cors-expose-headers: "*" nginx.ingress.kubernetes.io/cors-allow-origin: "*" ... watchIngressWithoutClass: true ... ingressClassResource: # -- Name of the ingressClass name: nginx # -- Is this ingressClass enabled or not enabled: true # -- Is this the default ingressClass for the cluster default: true # -- Controller-value of the controller that is processing this ingressClass controllerValue: "k8s.io/ingress-nginx" ... #extraArgs: {} extraArgs: default-ssl-certificate: "kube-system/nginx-ingress" ... tolerations: - key: "node-role.kubernetes.io/control-plane" operator: "Equal" effect: "NoSchedule" ... terminationGracePeriodSeconds: 30 nodeSelector: node-role.kubernetes.io/master: "" ... replicaCount: 3 ... #type: LoadBalancer type: NodePort nodePorts: http: 80 https: 443 tcp: 8080: 32808 #nodePorts: # http: "" # https: "" # tcp: {} # udp: {} ... -
安装ingress-nginx
helm install ingress-nginx ingress-nginx/ -n kube-system -
测试是否正常
$ curl http://10.81.0.101 <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx</center> </body> </html>
2、Nginx Ingress Controller
-
创建kube-system命名空间podpreset
cat > /data/k8s/install/podpreset.yaml <<'EOF' apiVersion: settings.k8s.io/v1alpha1 kind: PodPreset metadata: name: tz-env namespace: kube-system spec: selector: matchLabels: env: - name: TZ value: Asia/Shanghai EOF kubectl apply -f /data/k8s/install/podpreset.yaml -
helm添加仓库
mkdir -p /data/helm/install cd /data/helm/install helm repo add nginx-stable https://helm.nginx.com/stable helm repo update -
拉取nginx-ingress对应版本chart
helm pull nginx-stable/nginx-ingress --version=0.13.2 tar zxf nginx-ingress-0.13.2.tgz -
将已有证书上传到k8s集群
mkdir -p /data/certs/nginx-ingress cd /data/certs/nginx-ingress kubectl create secret tls nginx-ingress --cert=eminxing.crt --key=eminxing.key -n kube-system -
修改values配置
vim nginx-ingress/values.yaml ... # Timeout in milliseconds which the Ingress Controller will wait for a successful NGINX reload after a change or at the initial start. nginxReloadTimeout: 5000 ... config: ## The name of the ConfigMap used by the Ingress Controller. ## Autogenerated if not set or set to "". name: nginx-config ## The annotations of the Ingress Controller configmap. annotations: {} ## The entries of the ConfigMap for customizing NGINX configuration. entries: proxy-connect-timeout: "60s" proxy-read-timeout: "1800s" proxy-send-timeout: "1800s" client-max-body-size: "200m" worker-processes: "auto" worker-rlimit-nofile: "65535" worker-connections: "65535" keepalive-timeout: "300s" access-log-off: "true" log-format-escaping: "json" max-fails: "3" fail-timeout: "5s" keepalive: "256" server-snippets: | add_header Access-Control-Allow-Origin '*'; add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS,PUT,DELETE,OPTION'; add_header Access-Control-Allow-Headers 'DNT,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Forwarded-For'; add_header Access-Control-Allow-Credentials 'true'; location-snippets: | proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection $connection_upgrade; ... defaultTLS: cert: "" key: "" secret: kube-system/nginx-ingress ... ## The node selector for pod assignment for the Ingress Controller pods. nodeSelector: node-role.kubernetes.io/master: "" tolerations: - key: "node-role.kubernetes.io/control-plane" operator: "Equal" effect: "NoSchedule" ... ## The number of replicas of the Ingress Controller deployment. replicaCount: 3 setAsDefaultIngress: true enableSnippets: true ## The type of service to create for the Ingress Controller. type: NodePort httpPort: enable: true port: 80 nodePort: "80" targetPort: 80 httpsPort: enable: true port: 443 nodePort: "443" targetPort: 443 ... -
安装nginx-ingress
helm install nginx-ingress nginx-ingress/ -n kube-system -
测试是否正常
$ curl http://10.81.0.101 <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx</center> </body> </html>
六、Rancher(k8s管理web)高可用安装
-
helm添加rancher仓库
helm repo add rancher-stable http://rancher-mirror.oss-cn-beijing.aliyuncs.com/server-charts/stable -
创建rancher命名空间
kubectl create ns cattle-system -
创建cattle-system命名空间podpreset
cat > /data/k8s/install/podpreset.yaml <<'EOF' apiVersion: settings.k8s.io/v1alpha1 kind: PodPreset metadata: name: tz-env namespace: cattle-system spec: selector: matchLabels: env: - name: TZ value: Asia/Shanghai EOF kubectl apply -f /data/k8s/install/podpreset.yaml -
将已有证书上传到k8s集群
cd /data/certs/nginx-ingress kubectl create secret tls tls-rancher-ingress --cert=eminxing.crt --key=eminxing.key -n cattle-system -
拉取rancher对应版本chart
mkdir -p /data/helm/install cd /data/helm/install helm pull rancher-stable/rancher --version=2.5.5 tar zxf rancher-2.5.5.tgz -
修改values配置
vim rancher/values.yaml ... # Fully qualified name to reach your Rancher server # hostname: rancher.my.org hostname: rancher.eminxing.com ... ### ingress ### # Readme for details and instruction on adding tls secrets. ingress: extraAnnotations: {} # configurationSnippet - Add additional Nginx configuration. This example statically sets a header on the ingress. # configurationSnippet: | # more_set_input_headers "X-Forwarded-Host: {{ .Values.hostname }}"; tls: # options: rancher, letsEncrypt, secret source: secret ... # Number of Rancher server replicas. replicas: 2 ... -
安装Rancher
helm install rancher rancher/ -n cattle-system -
绑定host访问
10.81.0.101 rancher.eminxing.com
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