• 【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="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
#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="5"
#ETCD_MAX_WALS="5"
#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="0"
#ETCD_ENABLE_V2="true"
#
#[proxy]
#ETCD_PROXY="off"
#ETCD_PROXY_FAILURE_WAIT="5000"
#ETCD_PROXY_REFRESH_INTERVAL="30000"
#ETCD_PROXY_DIAL_TIMEOUT="1000"
#ETCD_PROXY_WRITE_TIMEOUT="5000"
#ETCD_PROXY_READ_TIMEOUT="0"
#
#[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"
    View Code

    　　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=""
    View Code

    　　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=""
    View Code

    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, 0 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"
    View Code

    　　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=""
    View Code

    　　

    　　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, 0 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"
    View Code

    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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  • 原文地址：https://www.cnblogs.com/sxdcgaq8080/p/10621437.html
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