CentOS7搭建k8s集羣

 

一.機器信息

[[email protected] ~]# uname -a
Linux kube-gmg-03-master-1 3.10.0-957.el7.x86_64 #1 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[[email protected] ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)

二、主機信息

本文準備了三臺機器用於部署k8s的運行環境,細節如下:

 

節點及功能

主機名

IP

Master、etcd、registry

K8s-master

10.255.61.1

Node1

K8s-node-1

10.255.61.2

Node2

K8s-node-2

10.255.61.3

 

三、設置三臺機器的主機名

  Master上執行:

hostnamectl --static set-hostname  k8s-master

  Node1上執行:

hostnamectl --static set-hostname  k8s-node-1

  Node2上執行:

hostnamectl --static set-hostname  k8s-node-2

四、設置hosts

三臺機器均執行如下命令:

echo '10.255.61.1    k8s-master
10.255.61.1   etcd
10.255.61.1   registry
10.255.61.2   k8s-node-1
10.255.61.3    k8s-node-2' >> /etc/hosts

五、關閉三臺機器上的防火牆

systemctl disable firewalld.service
systemctl stop firewalld.service

 六、三臺機器部署etcd

  k8s運行依賴etcd,需要先部署etcd,本文采用yum方式安裝:

yum install etcd -y

yum安裝的etcd默認配置文件在/etc/etcd/etcd.conf。編輯配置文件,更改以下帶顏色部分信息:

vi /etc/etcd/etcd.conf
複製代碼
# [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://0.0.0.0:2380"
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=""
複製代碼

啓動並驗證狀態(先啓動master的etcd)

複製代碼
systemctl start etcd
etcdctl set testdir/testkey0 0
etcdctl get testdir/testkey0 
etcdctl -C http://etcd:4001 cluster-health
etcdctl -C http://etcd:2379 cluster-health
複製代碼

擴展:Etcd集羣部署參見——http://www.cnblogs.com/zhenyuyaodidiao/p/6237019.html

七、部署master

7.1 安裝docker

yum install docker -y

配置Docker配置文件,使其允許從registry中拉取鏡像。

vim /etc/sysconfig/docker
複製代碼
# Modify these options if you want to change the way the docker daemon runs
OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
    DOCKER_CERT_PATH=/etc/docker
fi
OPTIONS='--insecure-registry registry:5000'
複製代碼

設置開機自啓動並開啓服務

systemctl enable docker.service
systemctl start docker

7.2 安裝kubernets

yum install kubernetes -y

7.3 配置並啓動kubernetes

在kubernetes master上需要安裝運行以下組件:

Kubernets API Server
Kubernets Controller Manager
Kubernets Scheduler

7.4 相應的要更改以下幾個配置中帶顏色部分信息:

複製代碼
$ vim /etc/kubernetes/apiserver

###
# 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="--insecure-bind-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=""
複製代碼
複製代碼
$ vim /etc/kubernetes/config

###
# 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"
複製代碼

7.5 啓動服務並設置開機自啓動,運行如下命令

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

八、部署node節點

8.1 參考7.1安裝docker 參考7.2安裝kubernets

8.2 node節點啓動kubernets

在kubernetes node上需要運行以下組件:

    Kubelet

    Kubernets Proxy

8.2.1 配置文件

複製代碼
$ vim /etc/kubernetes/config

###
# 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"
複製代碼
複製代碼
[[email protected] ~]# vim /etc/kubernetes/kubelet

###
# 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-node-1"

# 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=""
複製代碼

8.3 啓動服務並設置開機自啓動

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

8.4 查看狀態

  在master上查看集羣中節點及節點狀態

複製代碼
$  kubectl -s http://k8s-master:8080 get node
NAME         STATUS    AGE
k8s-node-1   Ready     3m
k8s-node-2   Ready     16s
$ kubectl get nodes
NAME         STATUS    AGE
k8s-node-1   Ready     3m
k8s-node-2   Ready     43s
複製代碼

至此,已經搭建了一個kubernetes集羣,但目前該集羣還不能很好的工作,請繼續後續的步驟。

九、創建覆蓋網絡——Flannel

9.1 安裝Flannel

  在master、node上均執行如下命令,進行安裝

[[email protected] ~]# yum install flannel

9.2 配置Flannel

  master、node上均編輯/etc/sysconfig/flanneld,修改紅色部分

複製代碼
[[email protected] ~]# vi /etc/sysconfig/flanneld

# 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=""
複製代碼

9.3 配置etcd中關於flannel的key

  Flannel使用Etcd進行配置,來保證多個Flannel實例之間的配置一致性,所以需要在etcd上進行如下配置:(‘/atomic.io/network/config’這個key與上文/etc/sysconfig/flannel中的配置項FLANNEL_ETCD_PREFIX是相對應的,錯誤的話啓動就會出錯)

[[email protected] ~]# etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'
{ "Network": "10.0.0.0/16" }

9.4 啓動

  啓動Flannel之後,需要依次重啓docker、kubernete。

  在master執行:

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kube-apiserver.service
systemctl restart kube-controller-manager.service
systemctl restart kube-scheduler.service

  在node上執行:

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kubelet.service
systemctl restart kube-proxy.service

涉及到的書籍——Kubernetes實戰Kubernetes權威指南:從Docker到Kubernetes實踐全接觸每天5分鐘玩轉Docker容器技術 Docker容器:利用Kubernetes、Flannel、Cockpit和Atomic構建和部署

感謝https://www.cnblogs.com/zhenyuyaodidiao/p/6500830.html

結束!

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