k8s 集群搭建（三台机器）
1.1设置系统主机名以及 Host 文件的相互解析
hostnamectl set-hostname k8s-master011.2安装依赖包
yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git1.3设置防火墙为 Iptables 并设置空规则
systemctl stop firewalld && systemctl disable firewalld
yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save1.4关闭 SELINUX
swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config1.5调整内核参数，对于 K8S
cat > kubernetes.conf <1.6调整系统时区
# 设置系统时区为 中国/上海
timedatectl set-timezone Asia/Shanghai
# 将当前的 UTC 时间写入硬件时钟timedatectl
timedatectl set-local-rtc 0
# 重启依赖于系统时间的服务
systemctl restart rsyslog
systemctl restart crond1.7关闭系统不需要服务
systemctl stop postfix && systemctl disable postfix1.8设置 rsyslogd 和 systemd journald
mkdir /var/log/journal # 持久化保存日志的目录
mkdir /etc/systemd/journald.conf.d
cat > /etc/systemd/journald.conf.d/99-prophet.conf <1.9升级系统内核为 4.44
CentOS 7.x 系统自带的 3.10.x 内核存在一些 Bugs，导致运行的 Docker、Kubernetes 不稳定，例如： rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
# 安装完成后检查 /boot/grub2/grub.cfg 中对应内核 menuentry 中是否包含 initrd16 配置，如果没有，再安装一次！
yum --enablerepo=elrepo-kernel install -y kernel-lt
# 设置开机从新内核启动
grub2-set-default "CentOS Linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)"
# 重启后安装内核源文件
yum --enablerepo=elrepo-kernel install kernel-lt-devel-$(uname -r) kernel-lt-headers-$(uname -r)1.10关闭 NUMA
cp /etc/default/grub{,.bak}
vim /etc/default/grub # 在 GRUB_CMDLINE_LINUX 一行添加 `numa=off` 参数，如下所示：
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rhgb quiet numa=off"
cp /boot/grub2/grub.cfg{,.bak}
grub2-mkconfig -o /boot/grub2/grub.cfg1.11kube-proxy开启ipvs的前置条件
modprobe br_netfilter
cat > /etc/sysconfig/modules/ipvs.modules <2.1安装 Docker 软件
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum update -y && yum install -y docker-ce
## 创 建 /etc/docker 目 录
mkdir /etc/docker
# 配 置 daemon.
cat > /etc/docker/daemon.json <3.1导入k8s所需要的文件（需要资料的加我QQ 1103225671）
#确保 /usr/local/kubernates/install 目录存在
scp * root@k8s-master01:/usr/local/kubernates/install
scp * root@k8s-master02:/usr/local/kubernates/install
scp * root@k8s-master03:/usr/local/kubernates/install
docker load -i haproxy.tar
docker load -i keepalived.tar
tar -zxvf kubeadm-basic.images.tar.gz
vi load-images.sh
#!/bin/bash
cd /usr/local/kubernates/install/kubeadm-basic.images
ls /usr/local/kubernates/install/kubeadm-basic.images | grep -v load-images.sh > /tmp/k8s-images.txt
for i in $( cat /tmp/k8s-images.txt )
do
docker load -i $i
done
rm -rf /tmp/k8s-images.txt
sh load-images.sh
tar -zxvf start.keep.tar.gz
mv data/ /
cd /data/lb/
vim etc/haproxy.cfg
server rancher01 10.0.104.151:6443 #集群地址
server rancher02 10.0.104.152:6443
server rancher03 10.0.104.153:6443
vim start-haproxy.sh
MasterIP1=10.0.104.151
MasterIP2=10.0.104.152
MasterIP3=10.0.104.153
./start-haproxy.sh
netstat -tunlp|grep 6444
vim start-keepalived.sh
VIRTUAL_IP=10.0.104.152 # 当前机器地址
INTERFACE=ens33 # 网卡名称
4.1安装 Kubeadm （主从配置）
cat > /etc/yum.repos.d/kubernetes.repo <4.2配置启动文件
kubeadm config print init-defaults > kubeadm-config.yaml
vi kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta1
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: abcdef.0123456789abcdef
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 10.0.104.152 # 主机地址
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
name: k8s-master02
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta1
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "10.0.104.151:6444" #终端地址
controllerManager: {}
dns:
type: CoreDNS
etcd:
local:
dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.14.0
networking:
dnsDomain: cluster.local
podSubnet: ""
serviceSubnet: 10.96.0.0/12
scheduler: {}
4.3初始化主节点
kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log4.4Etcd 集群状态查看
kubectl -n kube-system exec etcd-k8s-master01 -- etcdctl \
--endpoints=https://10.0.104.151:2379 \
--ca-file=/etc/kubernetes/pki/etcd/ca.crt \
--cert-file=/etc/kubernetes/pki/etcd/server.crt \
--key-file=/etc/kubernetes/pki/etcd/server.key cluster-health
kubectl get endpoints kube-controller-manager --namespace=kube-system -o yaml
kubectl get endpoints kube-scheduler --namespace=kube-system -o yaml
4.5部署网络
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
kubectl apply -f kube-flannel.yml发现报错plugin flannel does not support config version ，修改配置文件
vim /etc/cni/net.d/10-flannel.conflist
//加上cni的版本号
//文件内容如下
{
"name": "cbr0",
"cniVersion": "0.2.0",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
然后执行
systemctl daemon-reload
4.6查看节点
kubectl get nodes
4.7Java连接
io.fabric8
kubernetes-client
4.9.0
io.fabric8
kubernetes-assertions
4.0.0
test
public static void main(String[] args) {
//修改环境变量，重新指定kubeconfig读取位置
System.setProperty(Config.KUBERNETES_KUBECONFIG_FILE, "D:\\project\\k8s-demo\\src\\main\\resources\\config");
Config config = new ConfigBuilder().withMasterUrl("10.0.104.152:6443").build();
KubernetesClient client = new DefaultKubernetesClient(config);
NamespaceList myNs = client.namespaces().list();
ServiceList myServices = client.services().list();
ServiceList myNsServices = client.services().inNamespace("default").list();
}