搭建步骤

基础概念:https://www.cnblogs.com/sxdcgaq8080/p/10640879.html

=======================================环境准备阶段=========================================

1.新建三个虚拟机CentOS

参考地址:https://www.cnblogs.com/sxdcgaq8080/p/7466529.html
master 4G 50G
Node1 2G 40G
Node2 2G 40G

【需要注意的是,三台服务器上尽量不要已经安装了docker,否则会导致etcd安装失败,因为版本匹配的问题!!】

2.分别设置root账号 密码

3.分别启动网卡,获得IP,让本机的xshell可以连接上几台服务器

参考地址:https://www.cnblogs.com/sxdcgaq8080/p/9178926.html

4.分别修改静态主机名为

参考地址:https://www.cnblogs.com/sxdcgaq8080/p/10616441.html

192.168.92.131 k8s-master
192.168.92.132 k8s-node1
192.168.92.133 k8s-node2

分别在三台主机上输入命令

192.168.92.131输入:

  1. hostnamectl --static set-hostname k8s-master

192.168.92.132输入:

  1. hostnamectl --static set-hostname k8s-node1

192.168.92.133输入:

  1. hostnamectl --static set-hostname k8s-node2

5.分别在三台服务器的/etc/hosts文件中添加

  1. 192.168.92.131 k8s-master
  2. 192.168.92.131 etcd
  3. 192.168.92.131 registry
  4. 192.168.92.132 k8s-node1
  5. 192.168.92.133 k8s-node2

使用以下命令修改即可:

  1. vi /etc/hosts

6.分别关闭并禁用三台服务器的防火墙

参考地址:https://www.cnblogs.com/sxdcgaq8080/p/10032829.html

使用以下命令:【先停用,后禁用】

  1. systemctl stop firewalld.service
  1. systemctl disable firewalld.service

再使用查看命令查看,如果是如下效果,说明成功

  1. firewall-cmd --state

====================================主要安装步骤开始=====================================

一、主节点安装

主节点需要安装

etcd 存储数据中心

flannel k8s的一种网络方案

kubernetes 【包含:kube-api-server  controllerManager   Scheduler 】

1.etcd的安装

  1.1 命令

  1. yum install -y etcd

  1.2 修改配置文件

命令

  1. vi /etc/etcd/etcd.conf

修改内容为:

  1. # [member]
  2. ETCD_NAME=master
  3. ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
  4. #ETCD_WAL_DIR=""
  5. #ETCD_SNAPSHOT_COUNT=""
  6. #ETCD_HEARTBEAT_INTERVAL=""
  7. #ETCD_ELECTION_TIMEOUT=""
  8. #ETCD_LISTEN_PEER_URLS="http://localhost:2380"
  9. ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"
  10. #ETCD_MAX_SNAPSHOTS=""
  11. #ETCD_MAX_WALS=""
  12. #ETCD_CORS=""
  13. #
  14. #[cluster]
  15. #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"
  16. # if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
  17. #ETCD_INITIAL_CLUSTER="default=http://localhost:2380"
  18. #ETCD_INITIAL_CLUSTER_STATE="new"
  19. #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
  20. ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"
  21. #ETCD_DISCOVERY=""
  22. #ETCD_DISCOVERY_SRV=""
  23. #ETCD_DISCOVERY_FALLBACK="proxy"
  24. #ETCD_DISCOVERY_PROXY=""
  25. #ETCD_STRICT_RECONFIG_CHECK="false"
  26. #ETCD_AUTO_COMPACTION_RETENTION=""
  27. #ETCD_ENABLE_V2="true"
  28. #
  29. #[proxy]
  30. #ETCD_PROXY="off"
  31. #ETCD_PROXY_FAILURE_WAIT=""
  32. #ETCD_PROXY_REFRESH_INTERVAL=""
  33. #ETCD_PROXY_DIAL_TIMEOUT=""
  34. #ETCD_PROXY_WRITE_TIMEOUT=""
  35. #ETCD_PROXY_READ_TIMEOUT=""
  36. #
  37. #[security]
  38. #ETCD_CERT_FILE=""
  39. #ETCD_KEY_FILE=""
  40. #ETCD_CLIENT_CERT_AUTH="false"
  41. #ETCD_TRUSTED_CA_FILE=""
  42. #ETCD_AUTO_TLS="false"
  43. #ETCD_PEER_CERT_FILE=""
  44. #ETCD_PEER_KEY_FILE=""
  45. #ETCD_PEER_CLIENT_CERT_AUTH="false"
  46. #ETCD_PEER_TRUSTED_CA_FILE=""
  47. #ETCD_PEER_AUTO_TLS="false"
  48. #
  49. #[logging]
  50. #ETCD_DEBUG="false"
  51. # examples for -log-package-levels etcdserver=WARNING,security=DEBUG
  52. #ETCD_LOG_PACKAGE_LEVELS=""
  53. #
  54. #[profiling]
  55. #ETCD_ENABLE_PPROF="false"
  56. #ETCD_METRICS="basic"
  57. #
  58. #[auth]
  59. #ETCD_AUTH_TOKEN="simple"

  1.3 启动etcd服务并验证

启动etcd服务命令

  1. systemctl start etcd

设置etcd服务自启动

  1. systemctl enable etcd

检查健康状况

  1. etcdctl -C http://etcd:2379 cluster-health
  1. etcdctl -C http://etcd:4001 cluster-health

2.安装flannel

  2.1 安装命令

  1. yum install -y flannel

   2.2 配置flannel

命令:

  1. vi /etc/sysconfig/flanneld

修改内容为:

  1. # Flanneld configuration options
  2.  
  3. # etcd url location. Point this to the server where etcd runs
  4. FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"
  5.  
  6. # etcd config key. This is the configuration key that flannel queries
  7. # For address range assignment
  8. FLANNEL_ETCD_PREFIX="/atomic.io/network"
  9.  
  10. # Any additional options that you want to pass
  11. #FLANNEL_OPTIONS=""

  2.3 配置etcd中关于flannel的key

命令

  1. etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'

  2.4 启动flannel服务,并设置开机自启

  1. systemctl start flanneld.service
  1. systemctl enable flanneld.service

3.安装kubernetes

  3.1 安装命令

  1. yum install kubernetes

  3.2安装后,需要修改配置

配置修改是为了下面这些需要运行的组件

kube-api-server

kuber-scheduler

kube-controller-manager

命令:

  1. vi /etc/kubernetes/apiserver

更改内容为:

  1. ###
  2. # kubernetes system config
  3. #
  4. # The following values are used to configure the kube-apiserver
  5. #
  6.  
  7. # The address on the local server to listen to.
  8. KUBE_API_ADDRESS="--address=0.0.0.0"
  9.  
  10. # The port on the local server to listen on.
  11. KUBE_API_PORT="--port=8080"
  12.  
  13. # Port minions listen on
  14. KUBELET_PORT="--kubelet-port=10250"
  15.  
  16. # Comma separated list of nodes in the etcd cluster
  17. KUBE_ETCD_SERVERS="--etcd-servers=http://etcd:2379"
  18.  
  19. # Address range to use for services
  20. KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
  21.  
  22. # default admission control policies
  23. # KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
  24. KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
  25.  
  26. # Add your own!
  27. KUBE_API_ARGS=""

命令:

  1. vi /etc/kubernetes/config

更改内容为:

  1. ###
  2. # kubernetes system config
  3. #
  4. # The following values are used to configure various aspects of all
  5. # kubernetes services, including
  6. #
  7. # kube-apiserver.service
  8. # kube-controller-manager.service
  9. # kube-scheduler.service
  10. # kubelet.service
  11. # kube-proxy.service
  12. # logging to stderr means we get it in the systemd journal
  13. KUBE_LOGTOSTDERR="--logtostderr=true"
  14.  
  15. # journal message level, is debug
  16. KUBE_LOG_LEVEL="--v=0"
  17.  
  18. # Should this cluster be allowed to run privileged docker containers
  19. KUBE_ALLOW_PRIV="--allow-privileged=false"
  20.  
  21. # How the controller-manager, scheduler, and proxy find the apiserver
  22. KUBE_MASTER="--master=http://k8s-master:8080"

  3.3 分别启动三个组件服务,并且设置为自启动

  1. systemctl start kube-apiserver.service
  2. systemctl start kube-controller-manager.service
  3. systemctl start kube-scheduler.service
  1. systemctl enable kube-apiserver.service
  2. systemctl enable kube-controller-manager.service
  3. systemctl enable kube-scheduler.service

  

4.安装docker

参考地址:https://www.cnblogs.com/sxdcgaq8080/p/9178918.html

docker一定要最后安装,否则报错,解决方法:https://www.cnblogs.com/sxdcgaq8080/p/10622695.html

  4.1 安装docker命令:

  1. yum install -y docker

  4.2 启动docker服务命令:

  1. service docker start

  4.3 docker加入自启动服务命令:

  1. chkconfig docker on

二.子节点安装

子节点安装需要安装以下组件:

flannel

kubernetes

docker

【注意,两个子节点都要按照下面步骤安装】

1.flannel安装

  1.1 安装命令:

  1. yum install flannel

  1.2 配置flannel

修改配置文件:

  1. vi /etc/sysconfig/flanneld

配置文件修改为下:

  1. # Flanneld configuration options
  2.  
  3. # etcd url location. Point this to the server where etcd runs
  4. FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"
  5.  
  6. # etcd config key. This is the configuration key that flannel queries
  7. # For address range assignment
  8. FLANNEL_ETCD_PREFIX="/atomic.io/network"
  9.  
  10. # Any additional options that you want to pass
  11. #FLANNEL_OPTIONS=""

  

  1.3 启动flannel服务并设置自启动

  1. systemctl start flanneld.service
  1. systemctl enable flanneld.service

2.安装kubernetes

  2.1 安装命令

  1. yum install kubernetes

  

  2.2 配置文件修改

子节点上需要运行的kubernetes组件是:

kubelet

kubernetes-proxy

修改配置文件命令:

  1. vi /etc/kubernetes/config

两个子节点都修改配置文件内容为:

  1. ###
  2. # kubernetes system config
  3. #
  4. # The following values are used to configure various aspects of all
  5. # kubernetes services, including
  6. #
  7. # kube-apiserver.service
  8. # kube-controller-manager.service
  9. # kube-scheduler.service
  10. # kubelet.service
  11. # kube-proxy.service
  12. # logging to stderr means we get it in the systemd journal
  13. KUBE_LOGTOSTDERR="--logtostderr=true"
  14.  
  15. # journal message level, is debug
  16. KUBE_LOG_LEVEL="--v=0"
  17.  
  18. # Should this cluster be allowed to run privileged docker containers
  19. KUBE_ALLOW_PRIV="--allow-privileged=false"
  20.  
  21. # How the controller-manager, scheduler, and proxy find the apiserver
  22. KUBE_MASTER="--master=http://k8s-master:8080"

修改配置文件命令:

  1. vi /etc/kubernetes/kubelet

此处的配置文件内容,需要注意区分【k8s-node1】和【k8s-node2】,分别在两个节点上的配置文件的内容:

【红色字体标注部分,需要自行修改】

  1. ###
  2. # kubernetes kubelet (minion) config
  3.  
  4. # The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
  5. KUBELET_ADDRESS="--address=0.0.0.0"
  6.  
  7. # The port for the info server to serve on
  8. # KUBELET_PORT="--port=10250"
  9.  
  10. # You may leave this blank to use the actual hostname
  11. KUBELET_HOSTNAME="--hostname-override=k8s-node1"
  12.  
  13. # location of the api-server
  14. KUBELET_API_SERVER="--api-servers=http://k8s-master:8080"
  15.  
  16. # pod infrastructure container
  17. KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
  18.  
  19. # Add your own!
  20. KUBELET_ARGS=""

  2.3 分别启动两个子节点上的kubelet服务和kube-proxy服务,并设置自启动

  1. systemctl start kubelet.service
  1. systemctl start kube-proxy.service
  1. systemctl enable kubelet.service
  1. systemctl enable kube-proxy.service

3.docker安装

分别在两个子节点上执行如下命令:

  3.1 安装docker命令:

  1. yum install -y docker

  3.2 启动docker服务命令:

  1. service docker start

  3.3 docker加入自启动服务命令:

  1. chkconfig docker on

================================================================

*************************    到此处,k8s集群搭建完成    ************************

================================================================

三.验证集群状态

1.master节点执行命令,查看端点信息

  1. kubectl get endpoints

2.master节点执行命令,查看集群信息

  1. kubectl cluster-info

3.master节点执行命令,获取节点信息

  1. kubectl get nodes

如上,即k8s集群良好!!!!

===========================================================================

参考地址:https://www.jianshu.com/p/7d1fb03b8925

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