RKE部署高可用k8s集群

RKE部署环境准备

      RKE是经过CNCF认证的Kubernetes发行版,并且全部组件完全在Docker容器内运行
      Rancher Server只能在使用RKE或K3s安装的Kubernetes集群中运行

节点环境准备   

      1.开放每个节点的端口

         给多个窗口：发送同一命令
        “查看” —>“撰写” -->“撰写栏 / 撰写窗口”

             

         firewall-cmd --permanent --add-port=22/tcp
         firewall-cmd --permanent --add-port=80/tcp
         firewall-cmd --permanent --add-port=443/tcp

         firewall-cmd --permanent --add-port=30000-32767/tcp
         firewall-cmd --permanent --add-port=30000-32767/udp

         firewall-cmd --reload

      2.同步节点时间

         ntpdate time1.aliyun.com

      3.安装docker

          任何运行Rancher Server的节点上都需要安装Docker
          sudo  yum install -y yum-utils device-mapper-persistent-data lvm2
          sudo  yum-config-manager --add-repo   https://download.docker.com/linux/centos/docker-ce.repo
          sudo  yum install  docker-ce-18.09.3-3.el7

      4.安装kubectl

cat <<EOF > /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

       sudo yum install kubectl

      5.安装RKE

         Rancher Kubernetes Engine用于构建Kubernetes集群的CLI

         https://github.com/rancher/rke/releases/tag/v1.1.3

        

     6.安装Helm

        Kubernetes的软件包管理工具

        https://github.com/helm/helm

       

       

     7.配置ssh免密连接

        在执行rke up命令的主机上执行创建ssh公私钥 并把公钥分发到各个节点上

        ssh-keygen -t rsa
        ssh-copy-id 192.168.30.129
        ssh-copy-id 192.168.30.133

     8.配置操作系统参数支持k8s集群 (所有节点上都要执行)

        sudo swapoff -a
        sudo vi /etc/sysctl.conf
                 net.ipv4.ip_forward = 1
                 net.bridge.bridge-nf-call-ip6tables = 1
                 net.bridge.bridge-nf-call-iptables = 1
        sudo sysctl -p

     9.使用rke创建集群初始化配置文件

         rke config --name  cluster.yml

         RKE使用一个名为cluster.yml确定如何在集群中的节点上部署Kubernetes

# If you intened to deploy Kubernetes in an air-gapped environment,
# please consult the documentation on how to configure custom RKE images.
nodes:
- address: "192.168.30.110"
  port: "22"
  internal_address: ""
  role: [controlplane,etcd,worker]
  hostname_override: "node1"
  user: admin
  docker_socket: /var/run/docker.sock
  ssh_key: ""
  ssh_key_path: ~/.ssh/id_rsa
  ssh_cert: ""
  ssh_cert_path: ""
  labels: {}
  taints: []
- address: "192.168.30.129"
  port: "22"
  internal_address: ""
  role: [controlplane,etcd,worker]
  hostname_override: "node2"
  user: admin
  docker_socket: /var/run/docker.sock
  ssh_key: ""
  ssh_key_path: ~/.ssh/id_rsa
  ssh_cert: ""
  ssh_cert_path: ""
  labels: {}
  taints: []
- address: "192.168.30.133"
  port: "22"
  internal_address: ""
  role: [controlplane,etcd,worker]
  hostname_override: "node3"
  user: admin
  docker_socket: /var/run/docker.sock
  ssh_key: ""
  ssh_key_path: ~/.ssh/id_rsa
  ssh_cert: ""
  ssh_cert_path: ""
  labels: {}
  taints: []
services:
  etcd:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
    external_urls: []
    ca_cert: ""
    cert: ""
    key: ""
    path: ""
    uid: 0
    gid: 0
    snapshot: null
    retention: ""
    creation: ""
    backup_config: null
  kube-api:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
    service_cluster_ip_range: 10.43.0.0/16
    service_node_port_range: ""
    pod_security_policy: false
    always_pull_images: false
    secrets_encryption_config: null
    audit_log: null
    admission_configuration: null
    event_rate_limit: null
  kube-controller:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
    cluster_cidr: 10.42.0.0/16
    service_cluster_ip_range: 10.43.0.0/16
  scheduler:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
  kubelet:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
    cluster_domain: cluster.local
    infra_container_image: ""
    cluster_dns_server: 10.43.0.10
    fail_swap_on: false
    generate_serving_certificate: false
  kubeproxy:
    image: ""
    extra_args: {}
    extra_binds: []
    extra_env: []
network:
  plugin: flannel
  options: {}
  mtu: 0
  node_selector: {}
  update_strategy: null
authentication:
  strategy: x509
  sans: []
  webhook: null
addons: ""
addons_include: []
system_images:
  etcd: rancher/coreos-etcd:v3.4.3-rancher1
  alpine: rancher/rke-tools:v0.1.58
  nginx_proxy: rancher/rke-tools:v0.1.58
  cert_downloader: rancher/rke-tools:v0.1.58
  kubernetes_services_sidecar: rancher/rke-tools:v0.1.58
  kubedns: rancher/k8s-dns-kube-dns:1.15.2
  dnsmasq: rancher/k8s-dns-dnsmasq-nanny:1.15.2
  kubedns_sidecar: rancher/k8s-dns-sidecar:1.15.2
  kubedns_autoscaler: rancher/cluster-proportional-autoscaler:1.7.1
  coredns: rancher/coredns-coredns:1.6.9
  coredns_autoscaler: rancher/cluster-proportional-autoscaler:1.7.1
  nodelocal: rancher/k8s-dns-node-cache:1.15.7
  kubernetes: rancher/hyperkube:v1.18.3-rancher2
  flannel: rancher/coreos-flannel:v0.12.0
  flannel_cni: rancher/flannel-cni:v0.3.0-rancher6
  calico_node: rancher/calico-node:v3.13.4
  calico_cni: rancher/calico-cni:v3.13.4
  calico_controllers: rancher/calico-kube-controllers:v3.13.4
  calico_ctl: rancher/calico-ctl:v3.13.4
  calico_flexvol: rancher/calico-pod2daemon-flexvol:v3.13.4
  canal_node: rancher/calico-node:v3.13.4
  canal_cni: rancher/calico-cni:v3.13.4
  canal_flannel: rancher/coreos-flannel:v0.12.0
  canal_flexvol: rancher/calico-pod2daemon-flexvol:v3.13.4
  weave_node: weaveworks/weave-kube:2.6.4
  weave_cni: weaveworks/weave-npc:2.6.4
  pod_infra_container: rancher/pause:3.1
  ingress: rancher/nginx-ingress-controller:nginx-0.32.0-rancher1
  ingress_backend: rancher/nginx-ingress-controller-defaultbackend:1.5-rancher1
  metrics_server: rancher/metrics-server:v0.3.6
  windows_pod_infra_container: rancher/kubelet-pause:v0.1.4
ssh_key_path: ~/.ssh/id_rsa
ssh_cert_path: ""
ssh_agent_auth: false
authorization:
  mode: rbac
  options: {}
ignore_docker_version: null
kubernetes_version: ""
private_registries: []
ingress:
  provider: ""
  options: {}
  node_selector: {}
  extra_args: {}
  dns_policy: ""
  extra_envs: []
  extra_volumes: []
  extra_volume_mounts: []
  update_strategy: null
cluster_name: ""
cloud_provider:
  name: ""
prefix_path: ""
addon_job_timeout: 0
bastion_host:
  address: ""
  port: ""
  user: ""
  ssh_key: ""
  ssh_key_path: ""
  ssh_cert: ""
  ssh_cert_path: ""
monitoring:
  provider: ""
  options: {}
  node_selector: {}
  update_strategy: null
  replicas: null
restore:
  restore: false
  snapshot_name: ""
dns: null

   export KUBECONFIG=/home/admin/kube_config_cluster.yml

   mkdir ~/.kube
   cp kube_config_rancher-cluster.yml ~/.kube/config

   通过RKE安装k8s集群成功,启动的时候有些节点启动的比较慢。需要稍微等待一段时间.

在创建的k8s集群上安装Rancher

     

    重启一个Pod的命令就是把这个Pod直接删除掉

RKE的环境清理  

  rancher-node-1,2,3中分别执行以下命令

mkdir rancher
cat > rancher/clear.sh << EOF
df -h|grep kubelet |awk -F % '{print $2}'|xargs umount 
rm /var/lib/kubelet/* -rf
rm /etc/kubernetes/* -rf
rm /var/lib/rancher/* -rf
rm /var/lib/etcd/* -rf
rm /var/lib/cni/* -rf

rm -rf /var/run/calico 

iptables -F && iptables -t nat -F

ip link del flannel.1

docker ps -a|awk '{print $1}'|xargs docker rm -f
docker volume ls|awk '{print $2}'|xargs docker volume rm

rm -rf /var/etcd/
rm -rf /run/kubernetes/
docker rm -fv $(docker ps -aq)
docker volume rm  $(docker volume ls)
rm -rf /etc/cni
rm -rf /opt/cni

systemctl restart docker
EOF
sh rancher/clear.sh

 清理残留目录结束。如果还有问题可能需要卸载所有节点上的docker

首先查看Docker版本
# yum list installed | grep docker
docker-ce.x86_64  18.05.0.ce-3.el7.centos @docker-ce-edge
 
执行卸载
# yum -y remove docker-ce.x86_64
 
删除存储目录
 
# rm -rf /etc/docker
# rm -rf /run/docker
# rm -rf /var/lib/dockershim
# rm -rf /var/lib/docker


如果发现删除不掉，需要先 umount，如
# umount /var/lib/docker/devicemapper

  rke up --config=./rancher-cluster.yml  rke启动执行是幂等操作的 有时候需要多次执行才能成功

  

  多次执行启动后

  

rke多次安装和卸载k8s集群问题

      1.启动的时候提示ectd的集群健康检查失败

      

      清空节点上所有k8s的相关目录。卸载和删除docker所有相关目录。重新安装docker

      最后在执行rke启动命令