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Centos7搭建kubernetes搭建

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12/02
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安装前的准备工作：

Kubernetes包提供了一些服务：kube-apiserver，kube-scheduler，kube-controller-manager，kubelet，kube-proxy。 这些服务由systemd管理，配置位于： /etc/kubernetes 。

Kubernetes master 将会跑这些服务：kube-apiserver, kube-controller-manager ，kube-scheduler和etcd。 kubernates工作节点跑的服务有：kubelet, proxy, cadvisor and docker。 所有节点都会起flanneld实现跨主机网络。

二.准备三台电脑

master：192.168.0.5

node1：192.168.0.6

node2：192.168.0.7

三.卸载系统自带docker

yum list installed | grep docker

yum remove -y docker.x86_64 docker-client.x86_64 docker-common.x86_64

四。关闭防火墙

systemctl disable iptables-services firewalld
systemctl stop iptables-services firewalld
五。安装配置Kubernetes
sh -x k8s-master.sh 172.31.17.187
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------
#!/usr/bin/env bash
set -e
MASTER_IP=$1
if [ ! $MASTER_IP ]
then
echo "MASTER_IP is null"
exit 1
fi
echo "=================install ntpd==================="
yum -y install ntp
systemctl start ntpd
systemctl enable ntpd
echo "=================install docker, k8s, etcd, flannel==================="
cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo
[virt7-docker-common-release]
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0
EOF
yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd flannel
echo "=================config kubernetes==================="
mv /etc/kubernetes/config /etc/kubernetes/config.bak
cat <<EOF >/etc/kubernetes/config
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"
# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"
# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"
# How the replication controller and scheduler find the kube-apiserver
KUBE_MASTER="--master=http://${MASTER_IP}:8080"
EOF
setenforce 0
#systemctl disable iptables-services firewalld
#systemctl stop iptables-services firewalld
echo "================= config etcd======================"
sed -i s#'ETCD_LISTEN_CLIENT_URLS="http://localhost:2379"'#'ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"'#g /etc/etcd/etcd.conf
sed -i s#'ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"'#'ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"'#g /etc/etcd/etcd.conf
echo "================= config apiserver==================="
mv /etc/kubernetes/apiserver /etc/kubernetes/apiserver.bak
cat <<EOF >/etc/kubernetes/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 kubelets listen on
KUBELET_PORT="--kubelet-port=10250"
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://${MASTER_IP}:2379"
# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
# Add your own!
KUBE_API_ARGS=""
EOF
echo "=================start and set etcd==============="
systemctl start etcd
etcdctl mkdir /kube-centos/network
etcdctl mk /kube-centos/network/config "{ \"Network\": \"172.30.0.0/16\", \"SubnetLen\": 24, \"Backend\": { \"Type\": \"vxlan\" } }"
echo "=================config flannel==================="
mv /etc/sysconfig/flanneld /etc/sysconfig/flanneld.bak
cat <<EOF >/etc/sysconfig/flanneld
# Flanneld configuration options
# etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://${MASTER_IP}:2379"
# etcd config key. This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/kube-centos/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
EOF
echo "=================start etcd k8s ==================="
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler flanneld ; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
-------------------------------------------------------------------------------------------------------------------------------
注： 上面脚本并没有启动docker和kublet，如果测试时需要在master上运行服务，请启动docker，并按照node的kublet配置并启动kublet。
六。安装node
sh install-k8s-node.sh 172.31.17.187 172.31.25.80 # master_ip node_ip
------------------------------------------------------------------------------------------------------------------------------------------------------
#/usr/bin/env bash
set -e
MASTER_IP=$1
NODE_IP=$2
if [ ! $MASTER_IP ] || [ ! $NODE_IP ]
then
echo "MASTER_IP or NODE_IP is null"
exit 1
fi
echo '=================install ntpd==================='
yum -y install ntp
systemctl start ntpd
systemctl enable ntpd
echo "=================install docker, k8s, etcd, flannel==================="
cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo
[virt7-docker-common-release]
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0
EOF
yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd flannel
setenforce 0
echo "===============config kubernetes================"
mv /etc/kubernetes/config /etc/kubernetes/config.bak
cat <<EOF >/etc/kubernetes/config
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"
# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"
# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"
# How the replication controller and scheduler find the kube-apiserver
KUBE_MASTER="--master=http://${MASTER_IP}:8080"
EOF
echo "===============install docker, k8s, etcd, flannel================"
cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo
[virt7-docker-common-release]
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0
EOF
yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd flannel
echo "===============config kublet================"
mv /etc/kubernetes/kubelet /etc/kubernetes/kubelet.bak
cat <<EOF >/etc/kubernetes/kubelet
# The address for the info server to serve on
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
# Check the node number!
KUBELET_HOSTNAME="--hostname-override=${NODE_IP}"
# Location of the api-server
KUBELET_API_SERVER="--api-servers=http://${MASTER_IP}:8080"
# Add your own!
KUBELET_ARGS=""
EOF
echo "===============config flanneld================"
mv /etc/sysconfig/flanneld /etc/sysconfig/flanneld.bak
cat <<EOF >/etc/sysconfig/flanneld
# Flanneld configuration options
# etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://${MASTER_IP}:2379"
# etcd config key. This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/kube-centos/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
EOF
echo "==========start kube-proxy kubelet flanneld docker==========="
for SERVICES in kube-proxy kubelet flanneld docker; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
echo "==============set kubectl================"
kubectl config set-cluster default-cluster --server=http://${MASTER_IP}:8080
kubectl config set-context default-context --cluster=default-cluster --user=default-admin
kubectl config use-context default-context
-------------------------------------------------------------------------------------------------------------------------------------------
查看节点状态
$ kubectl get no
NAME STATUS AGE
NAME STATUS AGE
172.31.16.52 Ready 1h
172.31.25.80 Ready 2h
------------------------------------------------------------------------------------------------------------------------------------------------------
测试服务器
测试通过master部署两个nginx到node。
在master上新建文件nginx-deployment.yml
-------------------------------------------------------------------------------------------------------------------------------------------------------------
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 2 # tells deployment to run 2 pods matching the template
template: # create pods using pod definition in this template
metadata:
# unlike pod-nginx.yaml, the name is not included in the meta data as a unique name is
# generated from the deployment name
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
创建deployment
$ kubectl create -f nginx-deployment.yml
deployment "nginx-deployment" created
查看pod：
$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
nginx-deployment-4087004473-kbbgs 1/1 Running 0 1h 172.30.41.2 172.31.25.80
nginx-deployment-4087004473-m47bg 1/1 Running 0 1h 172.30.93.2 172.31.16.52
# 访问nginx
$curl 172.30.41
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
--------------------------------------------------------------------------------------------------------

如果发现 STATUS 一直处于 ContainerCreating 状态，可能是正在拉取镜像。可以查看详细信息.

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