使用kubeadm半自动安装kubernetes 1.13高可用集群(使用calico网络)
kubeadm手动安装kubernetes 1.13高可用集群
初始化集群:配置hosts文件
vim /etc/hosts
192.168.3.147test-master01 192.168.3.148test-master02 192.168.3.149test-master03 192.168.3.150test-work01配置免密登录
ssh-keygen ssh-copy-id test-master01 ssh-copy-id test-master02 ssh-copy-id test-master03 ssh-copy-id test-work01设置参数
- 关闭防火墙
systemctl stop firewalldsystemctl disable firewalld
- 关闭swap
swapoff -ased -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab修改 /etc/fstab 文件,注释掉 SWAP 的自动挂载,使用free -m确认swap已经关闭。
- 关闭selinux
sed-i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinuxsetenforce0
- 配置转发相关参数,否则可能会出错
cat <以上在所有的Kubernetes节点执行命令使修改生效/etc/sysctl.d/k8s.confnet.bridge.bridge-nf-call-ip6tables = 1net.bridge.bridge-nf-call-iptables = 1net.ipv4.ip_forward=1net.ipv4.tcp_tw_recycle=0vm.swappiness=0vm.overcommit_memory=1vm.panic_on_oom=0fs.inotify.max_user_watches=89100fs.file-max=52706963fs.nr_open=52706963net.ipv6.conf.all.disable_ipv6=1net.netfilter.nf_conntrack_max=2310720EOFsysctl --system
- kube-proxy开启ipvs
cat > /etc/sysconfig/modules/ipvs.modules <上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件,保证在节点重启后能自动加载所需模块。 使用lsmod | grep -e ip_vs -e nf_conntrack_ipv4命令查看是否已经正确加载所需的内核模块.接下来还需要确保各个节点上已经安装了ipset软件包yum install ipset。 为了便于查看ipvs的代理规则,最好安装一下管理工具ipvsadm yum install ipvsadm yum install ipset -yyum install ipvsadm -y如果以上前提条件如果不满足,则即使kube-proxy的配置开启了ipvs模式,也会退回到iptables模式
- 系统优化参数
systemctl enable ntpdate.service echo '*/30 * * * * /usr/sbin/ntpdate time7.aliyun.com >/dev/null 2>&1'> /tmp/crontab2.tmp crontab /tmp/crontab2.tmp systemctl start ntpdate.serviceecho "* soft nofile 65536" >> /etc/security/limits.conf echo "* hard nofile 65536" >> /etc/security/limits.conf echo "* soft nproc 65536" >>/etc/security/limits.conf echo "* hard nproc 65536" >>/etc/security/limits.conf echo "* soft memlock unlimited" >> /etc/security/limits.conf echo "* hard memlock unlimited" >>/etc/security/limits.conf安装dockeryum install -y epel-release yum install -y yum-utils device-mapper-persistent-data lvm2 net-tools conntrack-toolswget vim ntpdate libseccomp libtool-ltdltelnet rsync bind-utils yum install -y https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/docker-ce-18.06.1.ce-3.el7.x86_64.rpm配置docker国内镜像: 所有节点安装docker 编辑/etc/docker/daemon.json,添加以下一行{ "registry-mirrors":["https://registry.docker-cn.com"] }
重启dockersystemctl daemon-reload systemctl enable docker systemctl start docker注:如果使用overlay2的写法:daemon.json { "log-driver": "json-file", "log-opts": { "max-size": "100m", "max-file": "10" }, "registry-mirrors": ["https://pqbap4ya.mirror.aliyuncs.com"], "storage-driver": "overlay2", "storage-opts":["overlay2.override_kernel_check=true"] }如果要使用overlay2,前提条件为使用ext4,如果使用xfs,需要格式化磁盘加上参数 mkfs.xfs -n ftype=1 /path/to/your/device ,ftype=1这个参数需要配置为1 安装keepalived+haproxy 三台master 节点 略 VIP : 192.168.3.80 安装 kubeadm, kubelet 和 kubectl 所有节点都执行设置yum源cat <安装组件/etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF yum install -y kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1开机启动systemctl enable kubelet.service初始化K8S集群编辑kubeadm配置文件: 下面配置是kubeadm安装etcd写法:cat > kubeadm-config.yaml << EOF apiVersion: kubeadm.k8s.io/v1beta1 kind: ClusterConfiguration kubernetesVersion: v1.13.1 apiServer: certSANs: - "192.168.3.80" controlPlaneEndpoint: "192.168.3.80:8443" networking: podSubnet: "10.50.0.0/16" imageRepository: "harbor.oneitfarm.com/k8s-cluster-images" EOF CNI使用Calico,设置podSubnet: “10.50.0.0/16” 192.168.3.80是刚才安装haproxy+keepalived的VIP初始化第一个masterkubeadm init --config kubeadm-config.yaml ... [root@master01 ~]# mkdir -p $HOME/.kube [root@master01 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@master01 ~]# chown $(id -u):$(id -g) $HOME/.kube/config安装网络插件 按官网方式: Installing with the Kubernetes API datastore—50 nodes or less:kubectl apply -f \ https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml kubectl apply -f \ https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml以上建议先wget下来,需要根据自己网络修改配置 :- name: CALICO_IPV4POOL_CIDR value: "10.50.0.0/16"复制相关文件到其他master节点ssh root@master02 mkdir -p /etc/kubernetes/pki/etcd scp /etc/kubernetes/admin.conf root@master02:/etc/kubernetes scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@master02:/etc/kubernetes/pki scp /etc/kubernetes/pki/etcd/ca.* root@master02:/etc/kubernetes/pki/etcd部署master-other 在其它slave节点上执行下面命令,加入集群kubeadm join 192.168.3.80:8443 --token pv2a9n.uh2yx1082ffpdf7n --discovery-token-ca-cert-hash sha256:872cac35b0bfec28fab8f626a727afa6529e2a63e3b7b75a3397e6412c06ebc5 --experimental-control-planekube-proxy开启ipvs 修改ConfigMap的kube-system/kube-proxy中的config.conf,mode: “ipvs”:kubectl edit configmap kube-proxy -n kube-system kubectl get pod -n kube-system | grep kube-proxy | awk '{system("kubectl delete pod "$1" -- grace-period=0 --force -n kube-system")}'检查测试查看kubernetes集群状态kubectl get nodes -o wide kubectl get cs NAME STATUS MESSAGE ERROR controller-manager Healthy ok scheduler Healthy ok etcd-0 Healthy {"health": "true"}查看etcd集群状态 本文通过kubeadm自动安装etcd,也就是docker方式安装的etcd,可以exec进去容器内检查:kubectl exec -ti -n kube-system etcd-an-master01 sh / # export ETCDCTL_API=3 / # etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key member list
安装失败清理集群 集群初始化如果遇到问题,可以使用下面的命令进行清理:kubeadm reset systemctl stop kubelet systemctl stop docker rm -rf /var/lib/cni/ rm -rf /var/lib/kubelet/* rm -rf /etc/cni/ ifconfig cni0 down ifconfig flannel.1 down ifconfig docker0 down ip link delete cni0 ip link delete flannel.1 systemctl start docker设置资源调度 使用kubeadm初始化的集群,出于安全考虑Pod不会被调度到Master Node上,也就是说Master Node不参与工作负载。这是因为当前的master节点被打上了node-role.kubernetes.io/master:NoSchedule的污点:kubectl describe node master01 | grep Taint Taints: node-role.kubernetes.io/master:NoSchedule检查join进集群的master和work节点,如果调度不对,可以通过如下方式设置:[root@an-master01 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION an-master01 Ready master 4h39m v1.13.1 an-master02 Ready4h32m v1.13.1 an-master03 Ready master 86m v1.13.1 an-work01 Ready 85m v1.13.1 查看当前状态: kubectl describe nodes/an-master02 |grep -E '(Roles|Taints)' Roles: Taints: 设置为master节点且不调度: kubectl label node an-master02 node-role.kubernetes.io/master= kubectl taint nodes an-master02 node-role.kubernetes.io/master=:NoSchedule 如果想去除限制的话: kubectl taint nodes an-master03 node-role.kubernetes.io/master- work节点设置: kubectl label node an-work01 node-role.kubernetes.io/work= kubectl describe nodes/an-work01 |grep -E '(Roles|Taints)' Roles: work Taints: