【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
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