【k8s】搭建步骤

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：

hostnamectl --static set-hostname  k8s-master

192.168.92.132输入：

hostnamectl --static set-hostname  k8s-node1

192.168.92.133输入：

hostnamectl --static set-hostname  k8s-node2

5.分别在三台服务器的/etc/hosts文件中添加

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

使用以下命令修改即可：

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】

systemctl stop firewalld.service

systemctl disable firewalld.service

再使用查看命令查看，如果是如下效果，说明成功

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

yum install -y etcd

　　1.2 修改配置文件

命令

vi /etc/etcd/etcd.conf

修改内容为：

# [member]
ETCD_NAME=master
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT=""
#ETCD_HEARTBEAT_INTERVAL=""
#ETCD_ELECTION_TIMEOUT=""
#ETCD_LISTEN_PEER_URLS="http://localhost:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"
#ETCD_MAX_SNAPSHOTS=""
#ETCD_MAX_WALS=""
#ETCD_CORS=""
#
#[cluster]
#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"
# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
#ETCD_INITIAL_CLUSTER="default=http://localhost:2380"
#ETCD_INITIAL_CLUSTER_STATE="new"
#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"
#ETCD_DISCOVERY=""
#ETCD_DISCOVERY_SRV=""
#ETCD_DISCOVERY_FALLBACK="proxy"
#ETCD_DISCOVERY_PROXY=""
#ETCD_STRICT_RECONFIG_CHECK="false"
#ETCD_AUTO_COMPACTION_RETENTION=""
#ETCD_ENABLE_V2="true"
#
#[proxy]
#ETCD_PROXY="off"
#ETCD_PROXY_FAILURE_WAIT=""
#ETCD_PROXY_REFRESH_INTERVAL=""
#ETCD_PROXY_DIAL_TIMEOUT=""
#ETCD_PROXY_WRITE_TIMEOUT=""
#ETCD_PROXY_READ_TIMEOUT=""
#
#[security]
#ETCD_CERT_FILE=""
#ETCD_KEY_FILE=""
#ETCD_CLIENT_CERT_AUTH="false"
#ETCD_TRUSTED_CA_FILE=""
#ETCD_AUTO_TLS="false"
#ETCD_PEER_CERT_FILE=""
#ETCD_PEER_KEY_FILE=""
#ETCD_PEER_CLIENT_CERT_AUTH="false"
#ETCD_PEER_TRUSTED_CA_FILE=""
#ETCD_PEER_AUTO_TLS="false"
#
#[logging]
#ETCD_DEBUG="false"
# examples for -log-package-levels etcdserver=WARNING,security=DEBUG
#ETCD_LOG_PACKAGE_LEVELS=""
#
#[profiling]
#ETCD_ENABLE_PPROF="false"
#ETCD_METRICS="basic"
#
#[auth]
#ETCD_AUTH_TOKEN="simple"

　　1.3 启动etcd服务并验证

启动etcd服务命令

systemctl start etcd

设置etcd服务自启动

systemctl enable etcd

检查健康状况

etcdctl -C http://etcd:2379 cluster-health

etcdctl -C http://etcd:4001 cluster-health

2.安装flannel

　　2.1 安装命令

yum install -y flannel

　　 2.2 配置flannel

命令：

vi /etc/sysconfig/flanneld

修改内容为：

# Flanneld configuration options

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass
#FLANNEL_OPTIONS=""

　　2.3 配置etcd中关于flannel的key

命令

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

systemctl start flanneld.service

systemctl enable flanneld.service

3.安装kubernetes

　　3.1 安装命令

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：

vi /etc/kubernetes/apiserver

更改内容为：

###
# kubernetes system config
#
# The following values are used to configure the kube-apiserver
#

# The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"

# The port on the local server to listen on.
KUBE_API_PORT="--port=8080"

# Port minions listen on
KUBELET_PORT="--kubelet-port=10250"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://etcd:2379"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

# default admission control policies
# KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

# Add your own!
KUBE_API_ARGS=""

命令：

vi /etc/kubernetes/config

更改内容为：

###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
#   kube-apiserver.service
#   kube-controller-manager.service
#   kube-scheduler.service
#   kubelet.service
#   kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level,  is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"

# How the controller-manager, scheduler, and proxy find the apiserver
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

systemctl start kube-apiserver.service
systemctl start kube-controller-manager.service
systemctl start kube-scheduler.service

systemctl enable kube-apiserver.service
systemctl enable kube-controller-manager.service
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：

yum install  -y docker 

　　4.2 启动docker服务命令：

service docker start

　　4.3 docker加入自启动服务命令：

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：

yum install flannel

　　1.2 配置flannel

修改配置文件：

vi /etc/sysconfig/flanneld

配置文件修改为下：

# Flanneld configuration options

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass
#FLANNEL_OPTIONS=""

　　

　　1.3 启动flannel服务并设置自启动

systemctl start flanneld.service

systemctl enable flanneld.service

2.安装kubernetes

　　2.1 安装命令

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：

vi /etc/kubernetes/config

两个子节点都修改配置文件内容为：

###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
#   kube-apiserver.service
#   kube-controller-manager.service
#   kube-scheduler.service
#   kubelet.service
#   kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level,  is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"

# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://k8s-master:8080"

修改配置文件命令：

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】

###
# kubernetes kubelet (minion) config

# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=0.0.0.0"

# The port for the info server to serve on
# KUBELET_PORT="--port=10250"

# You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=k8s-node1"

# location of the api-server
KUBELET_API_SERVER="--api-servers=http://k8s-master:8080"

# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

# Add your own!
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

systemctl start kubelet.service

systemctl start kube-proxy.service

systemctl enable kubelet.service

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：

yum install  -y docker 

　　3.2 启动docker服务命令：

service docker start

　　3.3 docker加入自启动服务命令：

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

kubectl get endpoints

2.master节点执行命令，查看集群信息

kubectl cluster-info

3.master节点执行命令，获取节点信息

kubectl get nodes

如上，即k8s集群良好！！！！

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

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