Centos7部署Kubernetes集群
2018 年 1 月 10 日 9:38 Centos7 部署 Kubernetes 集群 1 、环境介绍及准备: 1.1 物理机操作系统 物理机操作系统采用 Centos7.3 64 位,细节如下。 [root@localhost ~]# uname -a Linux localhost.localdomain 3.10.0-514.6.1.el7.x86_64 #1 SMP Wed Jan 18 13:06:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux [root@localhost ~]# cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core) 1.2 主机信息 本文准备了三台机器用于部署 k8s 的运行环境,细节如下: 节点及功能 主机名 IP Master、etcd、registry K8s-master 10.0.251.148 Node1 K8s-node-1 10.0.251.153 Node2 K8s-node-2 10.0.251.155 设置三台机器的主机名: Master 上执行: [root@localhost ~]# hostnamectl —static set-hostname k8s-master Node1 上执行: [root@localhost ~]# hostnamectl —static set-hostname k8s-node-1 Node2 上执行: [root@localhost ~]# hostnamectl —static set-hostname k8s-node-2 在三台机器上设置 hosts ,均执行如下命令: echo ‘10.0.251.148 k8s-master 10.0.251.148 etcd 10.0.251.148 registry 10.0.251.153 k8s-node-1 10.0.251.155 k8s-node-2’ >> /etc/hosts 1.3 关闭三台机器上的防火墙
systemctl disable firewalld.service
systemctl stop firewalld.service
2 、部署 etcd k8s 运行依赖 etcd ,需要先部署 etcd ,本文采用 yum 方式安装:
[root@localhost ~]# yum install etcd -y
yum
安装的 etcd 默认配置文件在 /etc/etcd/etcd.conf 。编辑配置文件,更改以下带颜色部分信息:
[root@localhost ~]# vi /etc/etcd/etcd.conf
# [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=""
启动并验证状态
[root@localhost ~]# systemctl start etcd
[root@localhost ~]#
etcdctl set testdir/testkey0 0 0 [root@localhost ~]# etcdctl get testdir/testkey0 0 [root@localhost ~]# etcdctl -C http://etcd:4001 cluster-health member 8e9e05c52164694d is healthy: got healthy result from http://0.0.0.0:2379 cluster is healthy [root@localhost ~]# etcdctl -C http://etcd:2379 cluster-health member 8e9e05c52164694d is healthy: got healthy result from http://0.0.0.0:2379 cluster is healthy 扩展: Etcd 集群部署参见 ——http://www.cnblogs.com/zhenyuyaodidiao/p/6237019.html 3 、部署 master 3.1 安装
Docker
[root@k8s-master ~]# yum install docker
配置 Docker 配置文件,使其允许从 registry 中拉取镜像。
[root@k8s-master ~]# vim /etc/sysconfig/docker
# /etc/sysconfig/docker
# 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’ 设置开机自启动并开启服务
[root@k8s-master ~]# chkconfig docker on
[root@k8s-master ~]# service docker start
3.2 安装 kubernets [root@k8s-master ~]# yum install kubernetes 3.3 配置并启动 kubernetes 在 kubernetes master 上需要运行以下组件: Kubernets API Server Kubernets Controller Manager Kubernets Scheduler 相应的要更改以下几个配置中带颜色部分信息: 3.3.1 /etc/kubernetes/apiserver
[root@k8s-master ~]# 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="" 3.3.2 /etc/kubernetes/config
[root@k8s-master ~]# 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” 启动服务并设置开机自启动
[root@k8s-master ~]# systemctl enable kube-apiserver.service
[root@k8s-master ~]# systemctl start kube-apiserver.service
[root@k8s-master ~]# systemctl enable kube-controller-manager.service
[root@k8s-master ~]# systemctl start kube-controller-manager.service
[root@k8s-master ~]# systemctl enable kube-scheduler.service
[root@k8s-master ~]# systemctl start kube-scheduler.service
4 、部署 node 4.1 安装 docker 参见 3.1 4.2 安装 kubernets 参见 3.2 4.3 配置并启动 kubernetes 在 kubernetes node 上需要运行以下组件: Kubelet Kubernets Proxy 相应的要更改以下几个配置文中带颜色部分信息: 4.3.1 /etc/kubernetes/config
[root@K8s-node-1 ~]# 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” 4.3.2 /etc/kubernetes/kubelet
[root@K8s-node-1 ~]# 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="" 启动服务并设置开机自启动
[root@k8s-master ~]# systemctl enable kubelet.service
[root@k8s-master ~]# systemctl start kubelet.service
[root@k8s-master ~]# systemctl enable kube-proxy.service
[root@k8s-master ~]# systemctl start kube-proxy.service
4.4 查看状态 在 master 上查看集群中节点及节点状态
[root@k8s-master ~]#
kubectl -s
http://k8s-master:8080 get node NAME STATUS AGE k8s-node-1 Ready 3m k8s-node-2 Ready 16s [root@k8s-master ~]# kubectl get nodes NAME STATUS AGE k8s-node-1 Ready 3m k8s-node-2 Ready 43s 至此,已经搭建了一个 kubernetes 集群,但目前该集群还不能很好的工作,请继续后续的步骤。 5 、创建覆盖网络 ——Flannel 5.1 安装 Flannel 在 master 、 node 上均执行如下命令,进行安装 [root@k8s-master ~]# yum install flannel 版本为 0.0.5 5.2 配置 Flannel master 、 node 上均编辑 /etc/sysconfig/flanneld ,修改红色部分
[root@k8s-master ~]# 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 etwork”
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
5.3 配置 etcd 中关于 flannel 的 key Flannel 使用 Etcd 进行配置,来保证多个 Flannel 实例之间的配置一致性,所以需要在 etcd 上进行如下配置:( ‘/atomic.io etwork/config’ 这个 key 与上文 /etc/sysconfig/flannel 中的配置项 FLANNEL_ETCD_PREFIX 是相对应的,错误的话启动就会出错) [root@k8s-master ~]# etcdctl mk /atomic.io etwork/config ’{ “Network”: “10.0.0.0/16” }’ { “Network”: “10.0.0.0/16” } 5.4 启动 启动 Flannel 之后,需要依次重启 docker 、 kubernete 。 在 master 执行:
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 上执行:
systemctl enable flanneld.service
systemctl start flanneld.service
service docker restart
systemctl restart kubelet.service
systemctl restart kube-proxy.service
来自 < https://www.cnblogs.com/zhenyuyaodidiao/p/6500830.html