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kubeadm-高可用集群-centos
kubeadm是官方社区推出的一个用于快速部署kubernetes集群的工具。 # 安装要求 在开始之前,部署Kubernetes集群机器需要满足以下几个条件: - 一台或多台机器,操作系统 CentOS7.x-86_x64 - 硬件配置:2GB或更多RAM,2个CPU或更多CPU,硬盘30GB或更多 - 可以访问外网,需要拉取镜像,如果服务器不能上网,需要提前下载镜像并导入节点 - 禁止swap分区 # 初始化环境 ``` master1 192.168.1.51 master2 192.168.1.52 node1 192.168.1.54 node2 192.168.1.55 VIP(虚拟ip) 192.168.1.100 ``` ## 关闭防火墙 ``` systemctl stop firewalld systemctl disable firewalld ``` ## 关闭selinux ``` setenforce 0 sed -i 's/enforcing/disabled/' /etc/selinux/config ``` ## 关闭swap ``` swapoff -a sed -ri 's/.*swap.*/#&/' /etc/fstab ``` ## 根据规划设置主机名 ``` hostnamectl set-hostname master01.k8s.io hostnamectl set-hostname master02.k8s.io hostnamectl set-hostname node01.k8s.io hostnamectl set-hostname node02.k8s.io ``` ## 在所有机器添加hosts ``` cat >> /etc/hosts << EOF 192.168.1.100 master.k8s.io k8s-vip 192.168.1.51 master01.k8s.io master1 192.168.1.52 master02.k8s.io master2 192.168.1.54 node01.k8s.io node1 192.168.1.55 node02.k8s.io node2 EOF ``` ## 将桥接IPv4流量传递给iptables ``` cat > /etc/sysctl.d/k8s.conf << EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF ``` ## 立即生效 ``` sysctl --system ``` ## 时间同步 ``` yum install ntpdate -y ntpdate time.windows.com ``` # master配置高可用 ## 所有master节点安装相关包和keepalived ``` yum install -y conntrack-tools libseccomp libtool-ltdl keepalived ``` ## master1节点配置 ``` cat > /etc/keepalived/keepalived.conf <<EOF ! Configuration File for keepalived global_defs { router_id k8s } vrrp_script check_haproxy { script "killall -0 haproxy" interval 3 weight -2 fall 10 rise 2 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 250 advert_int 1 authentication { auth_type PASS auth_pass ceb1b3ec013d66163d6ab } virtual_ipaddress { 192.168.1.100 } track_script { check_haproxy } } EOF ``` ## master1节点配置 ``` cat > /etc/keepalived/keepalived.conf <<EOF ! Configuration File for keepalived global_defs { router_id k8s } vrrp_script check_haproxy { script "killall -0 haproxy" interval 3 weight -2 fall 10 rise 2 } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 200 advert_int 1 authentication { auth_type PASS auth_pass ceb1b3ec013d66163d6ab } virtual_ipaddress { 192.168.1.100 } track_script { check_haproxy } } EOF ``` ## 启动和检查 在两台master节点都执行 ``` systemctl enable --now keepalived.service systemctl status keepalived.service ip a ``` ## 所有master节点安装haproxy ## 安装haproxy ``` yum install -y haproxy ``` ## 配置haproxy 两台master节点的配置均相同,配置中声明了后端代理的两个master节点服务器,指定了haproxy运行的端口为16443等,因此16443端口为集群的入口 ``` cat > /etc/haproxy/haproxy.cfg << EOF #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global # to have these messages end up in /var/log/haproxy.log you will # need to: # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/syslog # # local2.* /var/log/haproxy.log # log 127.0.0.1 local2 chroot /var/lib/haproxy pidfile /var/run/haproxy.pid maxconn 4000 user haproxy group haproxy daemon # turn on stats unix socket stats socket /var/lib/haproxy/stats #--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0/8 option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 3000 #--------------------------------------------------------------------- # kubernetes apiserver frontend which proxys to the backends #--------------------------------------------------------------------- frontend kubernetes-apiserver mode tcp bind *:16443 option tcplog default_backend kubernetes-apiserver #--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend kubernetes-apiserver mode tcp balance roundrobin server master01.k8s.io 192.168.1.51:6443 check server master02.k8s.io 192.168.1.52:6443 check #--------------------------------------------------------------------- # collection haproxy statistics message #--------------------------------------------------------------------- listen stats bind *:1080 stats auth admin:awesomePassword stats refresh 5s stats realm HAProxy\ Statistics stats uri /admin?stats EOF ``` ## 两台master都启动和检查 ``` systemctl enable --now haproxy systemctl status haproxy ``` ## 检查端口 ``` netstat -lntup|grep haproxy ``` # 所有节点安装Docker/kubeadm/kubelet Kubernetes默认CRI(容器运行时)为Docker,因此先安装Docker。 ## 安装Docker ``` wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo yum -y install docker-ce-18.06.1.ce-3.el7 systemctl enable --now docker docker --version ``` ## 设置docker加速 ``` cat > /etc/docker/daemon.json << EOF { "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"] } EOF ``` ## 添加阿里云YUM软件源 ``` cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF ``` ## 安装kubeadm,kubelet和kubectl 由于版本更新频繁,这里指定版本号部署: ``` $ yum install -y kubelet-1.16.3 kubeadm-1.16.3 kubectl-1.16.3 $ systemctl enable kubelet ``` # master初始化 在具有vip的master上操作,这里为master1 ## 创建kubeadm配置文件 ``` mkdir /usr/local/kubernetes/manifests -p cd /usr/local/kubernetes/manifests/ vim kubeadm-config.yaml apiServer: certSANs: - master1 - master2 - master.k8s.io - 192.168.44.158 - 192.168.44.155 - 192.168.44.156 - 127.0.0.1 extraArgs: authorization-mode: Node,RBAC timeoutForControlPlane: 4m0s apiVersion: kubeadm.k8s.io/v1beta1 certificatesDir: /etc/kubernetes/pki clusterName: kubernetes controlPlaneEndpoint: "master.k8s.io:16443" controllerManager: {} dns: type: CoreDNS etcd: local: dataDir: /var/lib/etcd imageRepository: registry.aliyuncs.com/google_containers kind: ClusterConfiguration kubernetesVersion: v1.16.3 networking: dnsDomain: cluster.local podSubnet: 10.244.0.0/16 serviceSubnet: 10.1.0.0/16 scheduler: {} ``` ## 在master1节点执行 ``` kubeadm init --config kubeadm-config.yaml ``` ## 按照提示配置环境变量,使用kubectl工具: ``` mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config ``` ``` kubectl get nodes ``` ``` kubectl get pods -n kube-system ``` ## 加入集群 按照提示保存以下内容,一会要使用:** ```bash kubeadm join master.k8s.io:16443 --token jv5z7n.3y1zi95p952y9p65 \ --discovery-token-ca-cert-hash sha256:403bca185c2f3a4791685013499e7ce58f9848e2213e27194b75a2e3293d8812 \ --control-plane ``` ## 查看集群状态 ``` kubectl get cs kubectl get pods -n kube-system ``` # 安装集群网络 从官方地址获取到flannel的yaml,在master1上执行 ## 安装flannel网络 ``` kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml ``` ## 查看 ``` kubectl get pods -n kube-system ``` # master2节点加入集群 ## 复制密钥及相关文件 从master1复制密钥及相关文件到master2 ``` ssh root@192.168.1.52 mkdir -p /etc/kubernetes/pki/etcd scp /etc/kubernetes/admin.conf root@192.168.1.52:/etc/kubernetes scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@192.168.1.52:/etc/kubernetes/pki scp /etc/kubernetes/pki/etcd/ca.* root@192.168.1.52:/etc/kubernetes/pki/etcd ``` ## master2加入集群 执行在master1上init后输出的join命令,需要带上参数`--control-plane`表示把master控制节点加入集群 ``` kubeadm join master.k8s.io:16443 --token ckf7bs.30576l0okocepg8b --discovery-token-ca-cert-hash sha256:19afac8b11182f61073e254fb57b9f19ab4d798b70501036fc69ebef46094aba --control-plane ``` ## 检查状态 ``` kubectl get node kubectl get pods --all-namespaces ``` # 加入Kubernetes Node 在node1上执行,向集群添加新节点,执行在kubeadm init输出的kubeadm join命令: ``` kubeadm join master.k8s.io:16443 --token ckf7bs.30576l0okocepg8b --discovery-token-ca-cert-hash sha256:19afac8b11182f61073e254fb57b9f19ab4d798b70501036fc69ebef46094aba ``` **集群网络重新安装,因为添加了新的node节点** ## 检查状态 ``` kubectl get node kubectl get pods --all-namespaces ``` # 测试kubernetes集群 在Kubernetes集群中创建一个pod,验证是否正常运行: ``` kubectl create deployment nginx --image=nginx ``` ``` kubectl expose deployment nginx --port=80 --type=NodePort ``` ``` kubectl get pod,svc ``` 访问地址:http://NodeIP:Port
done
Oct. 28, 2024, 11:08 a.m.
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