kubeadm安装多master节点的k8s集群(1)
2022/7/7 23:21:53
本文主要是介绍kubeadm安装多master节点的k8s集群(1)，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
一、环境准备
| k8s集群角色 | IP | 主机名 | 安装的相关组件 |
| 控制节点 | 192.168.1.10 | master | apiserver、controller-manager、scheduler、kubelet、etcd、docker、kube-proxy、keepalived、nginx、calico |
| 控制节点 | 192.168.1.11 | pod1 | apiserver、controller-manager、scheduler、kubelet、etcd、docker、kube-proxy、keepalived、nginx、calico |
| 工作节点 | 192.168.1.12 | pod2 | kubelet、kube-porxy、docker、calico、coredns |
| VIP | 192.168.1.20 |
# 准备命令
# 1.修改主机名，配置静态IP
hostnamectl set-hostname master && bash
# 2.配置主机hosts
vi /etc/hosts
192.168.1.10 master
192.168.1.11 pod1
192.168.1.12 pod2
# 3.配置主机之间ssh信任
ssh-kegen -t rsa
ssh-copy-id master
# 4.关闭交换分区
swaoff -a # 临时关闭
永久关闭为注销/etc/fstab中swap一行
# 5.修改机器内核参数
modprobe br_netfilter
echo "modprobe br_netfilter" >> /etc/profile
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf
# 6. 关闭防火墙
systemctl stop firewalld ; systemctl disable firewalld
# 7.关闭selinux,修改 x selinux 配置文件之后，重启
sed - - i 's/SELINUX=enforcing/SELINUX=disabled/g'
/etc/selinux/config
# 8.配置阿里云yum源
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
yum makecache fast
# 9.配置kubernets源
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
# 10.时间同步并定时同步
yum install ntpdate -y
ntpdate time1.aliyun.com
* */1 * * * /usr/sbin/ntpdate time1.aliyun.com
systemctl restart crond
# 11.开启ipvs支持（组件kube-proxy用到）
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack"
for kernel_module in ${ipvs_modules}; do
/sbin/modinfo -F filename ${kernel_module} > /dev/null 2>&1
if [ 0 -eq 0 ]; then
/sbin/modprobe ${kernel_module}
fi
done
[root@master ~]#chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs
ip_vs_ftp 13079 0
nf_nat 26583 1 ip_vs_ftp
ip_vs_sed 12519 0
ip_vs_nq 12516 0
ip_vs_sh 12688 0
ip_vs_dh 12688 0
# ipvs (IP Virtual Server) 实现了传输层负载均衡，也就是我们常说的 4层LAN交换，作为 Linux内核的一部分。ipvs运行在主机上，在真实服务器集群前充当负载均衡器。ipvs 可以将基于TCP 和 和 UDP的服务请求转发到真实服务器上，并使真实服务器的服务在单个 IP 地址上显示为虚拟服务
二、基础软件包安装
yum install -y yum-utils device-mapper-persistent-data lvm2 wget net-tools nfs-utils lrzsz gcc gcc-c++ make cmake libxml2-devel openssl-devel curl curl-devel unzip sudo ntp libaio-devel wget vim ncurses-devel autoconf automake zlib-devel python-devel epel-release openssh-server socat conntrack ntpdate telnet ipvsadm iptables-services # 停止iptables服务并禁止开机启动 service iptables stop && systemctl disable iptables # 清空规则 iptables -F
- docker服务安装
# 1.安装docker-ce,是否指定版本自定义
yum install docker-ce-20.10.17 docker-ce-cli-20.10.17 containerd.io -y
# 2.启动并设置为开机启动
systemctl start docker && systemctl enable docker && systemctl status docker
# 3.配置镜像加速器
mkdir /etc/docker
vi /etc/docker/daemon.json
{
"registry-mirrors":["https://pft7f97f.mirror.aliyuncs.com", "https://rsbud4vc.mirror.aliyuncs.com","https://registry.docker-cn.com","https://docker.mirrors.ustc.edu.cn","https://dockerhub.azk8s.cn","http://hub-mirror.c.163.com","http://qtid6917.mirror.aliyuncs.com", "https://rncxm540.mirror.aliyuncs.com"],
"exec-opts": ["native.cgroupdriver=systemd"]
}
#exec-opts 修改驱动
修改docker文件驱动为systemd ，默认为 cgroupfs ,kubelet默认使用 systemd ，两者必须一致才可以.
systemctl daemon-reload && systemctl restart docker && systemctl status docker
- K8S初始化所需软件包
# 安装软件包（一般不按装最新的） yum install -y kubelet-1.20.7 kubeadm-1.20.7 kubectl-1.20.7 systemctl enable kubelet && systemctl start kubelet && systemctl status kubelet 注： Kubeadm : kubeadm 是一个工具，用来初始化 k ks 8s 集群的 kubelet : 安装在集群所有节点上，用于启动Pod的 kubectl: : 通过kubectl可以部署和管理应用，查看各种资源，创建、删除和更新各种组件 # 目前kubectl是起不来的，等初始化后就会自动启动 Active: activating (auto-restart) (Result: exit-code)
- 通过keepalive+nginx实现k8s apiserver高可用
# 1.在master和pod1上安装nginx
yum install nginx keepalived -y
# 2.修改配置文件
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
stream {
log_format main '$remote_addr $upstream_addr-[$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.1.10:6443; # Master1 APISERVER IP:PORT
server 192.168.1.11:6443; # Master2 APISERVER IP:PORT
}
server {
listen 16443;
proxy_pass k8s-apiserver;
}
}
http {
log_format main '$remote_addr - - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types
default_type application/octet-stream;
server {
listen 80 default_server;
server_name _;
location / {
}
}
}
# yum安装的nginx检测会报错unknown directive "stream"，没有stream模块
解决方法：yum install nginx-mod-stream -y
源码编译安装，添加参数：--with-stream
# keepalived.conf配置
# master:
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_MASTER
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state MASTER
interface ens33 # 实际网卡名称
virtual_router_id 51 # vrrp路由ID实例，每个实例唯一
priority 100 # 优先级，备服务器设置为90
advert_int 1 # 指定vrrp心跳包通告间隔时间，默认1s
authentication {
auth_type PASS
auth_pass 1111
}
# 虚拟IP(VIP)
virtual_ipaddress {
192.168.1.20/24
}
track_script {
check_nginx
}
}
# vrrp_script ：指定检查nginx工作状态脚本（根据nginx 状态判断是否故障转移）
# pod1的keepalived.conf
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_BACKUP
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.20/24
}
track_script {
check_nginx
}
}
# /etc/keepalived/check_nginx.sh检查nginx脚本编写
#!/bin/bash
count=$(ps -ef | grep nginx | grep sbin | egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
systemctl stop keepalived
fi
chmod +x /etc/keepalived/check_nginx.sh
# 注：keepalived 根据脚本返回状态码（0为工作正常，非 0 不正常）判断是否故障转移
keepalived配置
# 启动程序 systemctl daemon-reload systemctl start nginx && systemctl enable nginx && systemctl status nginx systemctl start keepalived && systemctl enable keepalived && systemctl status keepalived
# master上可以看到2个IP，pod1上只能看到1个
# ip addr
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:09:d2:4e brd ff:ff:ff:ff:ff:ff
inet 192.168.1.10/24 brd 192.168.1.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.1.20/24 scope global secondary ens33
valid_lft forever preferred_lft forever
inet6 fe80::7088:c179:979e:a672/64 scope link noprefixroute
valid_lft forever preferred_lft forever
测试：停止master的nginx就会发现192.168.1.20这个IP漂移到pod1服务器上，重启master的nginx和keepalived后，IP还会漂移回master
三、Kubeadm初始化k8s集群
主节点：
# 在master上创建kubeadm-config.yaml
# 使用准备好的镜像
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.20.6
controlPlaneEndpoint: 192.168.1.20:16443
imageRepository: registry.aliyuncs.com
imageRepository: registry.aliyuncs.com/google_containers
apiServer:
certSANs:
- 192.168.1.10
- 192.168.1.11
- 192.168.1.12
- 192.168.1.20
networking:
podSubnet: 10.244.0.0/16
serviceSubnet: 10.10.0.0/16
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs
"""
注： --image-repository registry.aliyuncs.com/google_containers ： 手动指定仓库地址为
registry.aliyuncs.com/google_containers kubeadm 默认从k8s.grc.io 拉取镜像,但是k8s.grc.io访问不到，所以需要指定从registry.aliyuncs.com/google_containers 仓库拉取镜像 。
"""
# kubeadm需要准备的镜像，可以提前准备然后倒入,这次用的别人准备好的
# master和pod1上导入准备好的镜像
导入：docker load -i k8simage-1-20-6.tar.gz
[root@master ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
registry.aliyuncs.com/google_containers/kube-proxy v1.20.6 9a1ebfd8124d 14 months ago 118MB
registry.aliyuncs.com/google_containers/kube-scheduler v1.20.6 b93ab2ec4475 14 months ago 47.3MB
registry.aliyuncs.com/google_containers/kube-apiserver v1.20.6 b05d611c1af9 14 months ago 122MB
registry.aliyuncs.com/google_containers/kube-controller-manager v1.20.6 560dd11d4550 14 months ago 116MB
calico/pod2daemon-flexvol v3.18.0 2a22066e9588 16 months ago 21.7MB
calico/node v3.18.0 5a7c4970fbc2 16 months ago 172MB
calico/cni v3.18.0 727de170e4ce 16 months ago 131MB
calico/kube-controllers v3.18.0 9a154323fbf7 16 months ago 53.4MB
registry.aliyuncs.com/google_containers/etcd 3.4.13-0 0369cf4303ff 22 months ago 253MB
registry.aliyuncs.com/google_containers/coredns 1.7.0 bfe3a36ebd25 2 years ago 45.2MB
registry.aliyuncs.com/google_containers/pause 3.2 80d28bedfe5d 2 years ago 683kB
calico组件
https://projectcalico.docs.tigera.io/calico-enterprise/
# 初始化
kubeadm init --config kubeadm-config.yaml -- ignore-preflighterrors=SystemVerification
# 执行结果：
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:
# pod1需要，从k8s加入
kubeadm join 192.168.1.20:16443 --token dmk0g4.1l9kz4el5ewkhy57 \
--discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27 \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
# k8s节点加入命令
kubeadm join 192.168.1.20:16443 --token dmk0g4.1l9kz4el5ewkhy57 \
--discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27
mkdir -p $HOME/.kube cp -i /etc/kubernetes/admin.conf $HOME/.kube/config chown $(id -u):$(id -g) $HOME/.kube/config [root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master NotReady control-plane,master 11h v1.20.7 此时集群状态还是NotReady 状态，因为没有安装网络 插件
四、扩容k8s集群-添加master节点
从节点：
# pod1: # 1.创建证书目录 mkdir -p /etc/kubernetes/pki/etcd && mkdir -p ~/.kube/ # 2.将master节点的证书拷贝到pod1对应目录里 [root@master pki]# cd /etc/kubernetes/pki/ [root@master pki]# scp ca.crt sa.key sa.pub front-proxy-ca.crt front-proxy-ca.key ca.key root@pod1:/etc/kubernetes/pki/ [root@master etcd]# cd /etc/kubernetes/pki/etcd/ [root@master etcd]# scp ca.crt ca.key root@pod1:/etc/kubernetes/pki/etcd/ # 3.在master主节点上查看生成token [root@master ~]# kubeadm token create --print-join-command kubeadm join 192.168.1.20:16443 --token lrbume.ymtfk5o4tvcd6cg2 --discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27 # 4.pod1节点执行加入master kubeadm join 192.168.1.20:16443 --token lrbume.ymtfk5o4tvcd6cg2 --discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27 --control-plane 成功结果：Run 'kubectl get nodes' to see this node join the cluster. [root@pod1 ~]# mkdir -p $HOME/.kube [root@pod1 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@pod1 ~]# chown $(id -u):$(id -g) $HOME/.kube/config [root@pod1 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master NotReady control-plane,master 11h v1.20.7 pod1 NotReady control-plane,master 43s v1.20.7 [root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master NotReady control-plane,master 12h v1.20.7 pod1 NotReady control-plane,master 2m33s v1.20.7
五、添加node节点进入集群
# pod2节点需要 [root@pod2 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE registry.aliyuncs.com/google_containers/kube-proxy v1.20.7 ff54c88b8ecf 14 months ago 118MB registry.aliyuncs.com/google_containers/kube-apiserver v1.20.7 034671b24f0f 14 months ago 122MB registry.aliyuncs.com/google_containers/kube-controller-manager v1.20.7 22d1a2072ec7 14 months ago 116MB registry.aliyuncs.com/google_containers/kube-scheduler v1.20.7 38f903b54010 14 months ago 47.3MB calico/pod2daemon-flexvol v3.18.0 2a22066e9588 16 months ago 21.7MB calico/node v3.18.0 5a7c4970fbc2 16 months ago 172MB calico/cni v3.18.0 727de170e4ce 16 months ago 131MB calico/kube-controllers v3.18.0 9a154323fbf7 16 months ago 53.4MB registry.aliyuncs.com/google_containers/etcd 3.4.13-0 0369cf4303ff 22 months ago 253MB registry.aliyuncs.com/google_containers/coredns 1.7.0 bfe3a36ebd25 2 years ago 45.2MB registry.aliyuncs.com/google_containers/pause 3.2 80d28bedfe5d 2 years ago 683kB # 将节点加入集群 kubeadm join 192.168.1.20:16443 --token lrbume.ymtfk5o4tvcd6cg2 --discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27 执行成功： Run 'kubectl get nodes' on the control-plane to see this node join the cluster. # master上查看 [root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master NotReady control-plane,master 12h v1.20.7 pod1 NotReady control-plane,master 10m v1.20.7 pod2 NotReady <none> 47s v1.20.7 # 1.20版本ROLES节点显示都是<none>，有需要可以修改为work [root@master ~]# kubectl label node pod2 node-role.kubernets.io/worker=worker
# 查看插件情况 # 名称空间 [root@master ~]# kubectl get pods No resources found in default namespace. # coredns都是Pending状态,因为没装网络插件，-o wide可以查看到服务安装在那个节点上 [root@master ~]# kubectl get pods -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES coredns-7f89b7bc75-bflk2 0/1 Pending 0 12h <none> <none> <none> <none> coredns-7f89b7bc75-z4k77 0/1 Pending 0 12h <none> <none> <none> <none> etcd-master 1/1 Running 1 12h 192.168.1.10 master <none> <none> etcd-pod1 1/1 Running 0 24m 192.168.1.11 pod1 <none> <none> kube-apiserver-master 1/1 Running 1 12h 192.168.1.10 master <none> <none> kube-apiserver-pod1 1/1 Running 0 24m 192.168.1.11 pod1 <none> <none> kube-controller-manager-master 1/1 Running 2 12h 192.168.1.10 master <none> <none> kube-controller-manager-pod1 1/1 Running 0 24m 192.168.1.11 pod1 <none> <none> kube-proxy-8mt7s 1/1 Running 0 14m 192.168.1.12 pod2 <none> <none> kube-proxy-bqt8c 1/1 Running 0 24m 192.168.1.11 pod1 <none> <none> kube-proxy-vwb7g 1/1 Running 1 12h 192.168.1.10 master <none> <none> kube-scheduler-master 1/1 Running 2 12h 192.168.1.10 master <none> <none> kube-scheduler-pod1 1/1 Running 0 24m 192.168.1.11 pod1 <none> <none>
六、网络插件安装---Calico
# 1.注：在线下载配置文件地址是： https://docs.projectcalico.org/manifests/calico.yaml # calico组件功能：功能多，性能好，可以做网络策略 # 2.安装 wget https://docs.projectcalico.org/manifests/calico.yaml --no-check-certificate [root@master ~]# kubectl apply -f calico.yaml 报错：calico版本不匹配 error: unable to recognize "calico.yaml": no matches for kind "PodDisruptionBudget" in version "policy/v1" 解决方法：更换calico.yml # 3.查看 # 安装完成后可以发现coredns已经改变状态 [root@master ~]# kubectl get pods -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES calico-kube-controllers-6949477b58-c8vzf 1/1 Running 0 2m43s 10.244.219.65 master <none> <none> calico-node-2wqck 1/1 Running 0 2m43s 192.168.1.12 pod2 <none> <none> calico-node-9898g 1/1 Running 0 2m43s 192.168.1.10 master <none> <none> calico-node-jstb4 1/1 Running 0 2m43s 192.168.1.11 pod1 <none> <none> coredns-7f89b7bc75-bflk2 1/1 Running 0 12h 10.244.219.67 master <none> <none> coredns-7f89b7bc75-z4k77 1/1 Running 0 12h 10.244.219.66 master <none> <none> etcd-master 1/1 Running 1 12h 192.168.1.10 master <none> <none> etcd-pod1 1/1 Running 0 48m 192.168.1.11 pod1 <none> <none> kube-apiserver-master 1/1 Running 1 12h 192.168.1.10 master <none> <none> kube-apiserver-pod1 1/1 Running 0 48m 192.168.1.11 pod1 <none> <none> kube-controller-manager-master 1/1 Running 2 12h 192.168.1.10 master <none> <none> kube-controller-manager-pod1 1/1 Running 0 48m 192.168.1.11 pod1 <none> <none> kube-proxy-8mt7s 1/1 Running 0 38m 192.168.1.12 pod2 <none> <none> kube-proxy-bqt8c 1/1 Running 0 48m 192.168.1.11 pod1 <none> <none> kube-proxy-vwb7g 1/1 Running 1 12h 192.168.1.10 master <none> <none> kube-scheduler-master 1/1 Running 2 12h 192.168.1.10 master <none> <none> kube-scheduler-pod1 1/1 Running 0 48m 192.168.1.11 pod1 <none> <none> # 状态从NotReady变为Ready [root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready control-plane,master 12h v1.20.7 pod1 Ready control-plane,master 49m v1.20.7 pod2 Ready <none> 39m v1.20.7
测试k8s创建pod是否可以正常联网：
# master上下载一个镜像镜像测试网络 docker search busybox docker pull busybox [root@master ~]# kubectl run busybox --image busybox:latest --restart=Never --rm -it busybox -- sh If you don't see a command prompt, try pressing enter. / # ping baidu.com PING baidu.com (220.181.38.148): 56 data bytes 64 bytes from 220.181.38.148: seq=0 ttl=127 time=29.778 ms # 通过上面可以看到能访问网络 ，说明calico 网络插件已经被正常安装了 [root@master ~]# kubectl run busybox --image busybox:1.28 --restart=Never --rm -it busybox -sh # 报错: Unable to connect to the server: dial tcp: lookup h on 114.114.114.114:53: no such host 原因：-sh改成 -- sh ；--和sh之间有空格 [root@pod1 ~]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES busybox 1/1 Running 0 2m59s 10.244.145.193 pod2 <none> <none>
测试k8s集群中部署tomcat服务
# 在pod2上加载镜像tomcat
[root@pod2 ~]# docker load -i tomcat.tar.gz
# 在master上执行
[root@master ~]# cat tomcat.yaml
apiVersion: v1 #pod属于k8s核心组v1
kind: Pod #创建的是一个Pod资源
metadata: #元数据
name: demo-pod #pod名字
namespace: default #pod所属的名称空间
labels:
app: myapp #pod具有的标签
env: dev #pod具有的标签
spec:
containers: #定义一个容器，容器是对象列表，下面可以有多个name
- name: tomcat-pod-java #容器的名字
ports:
- containerPort: 8080
image: tomcat:8.5-jre8-alpine #容器使用的镜像
imagePullPolicy: IfNotPresent
[root@master ~]# kubectl apply -f tomcat.yaml
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
demo-pod 1/1 Running 0 51s 10.244.145.194 pod2 <none> <none>
[root@master ~]# curl -I 10.244.145.194:8080
HTTP/1.1 200
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 07 Jul 2022 04:47:25 GMT
# 10.244.145.194 只能在k8s集群中访问，外网不能访问，如果需要访问要做服务
[root@master ~]# cat tomcat-service.yaml
apiVersion: v1
kind: Service
metadata:
name: tomcat
spec:
type: NodePort
ports:
- port: 8080
nodePort: 30080 #物理机端口30080映射到容器中8080
selector:
app: myapp
env: dev
[root@master ~]# kubectl apply -f tomcat-service.yaml
service/tomcat created
[root@master ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.10.0.1 <none> 443/TCP 13h
tomcat NodePort 10.10.13.139 <none> 8080:30080/TCP 9s
# 再次测试
[root@master ~]# curl -I 192.168.1.10:30080
HTTP/1.1 200
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 07 Jul 2022 04:56:04 GMT
浏览器访问
http://192.168.1.10:30080
七、测试coredns是否正常，是否能解析域名
# 查看coredns的IP [root@master ~]# kubectl get svc -n kube-system NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kube-dns ClusterIP 10.10.0.10 <none> 53/UDP,53/TCP,9153/TCP 13h [root@master ~]# kubectl run busybox --image busybox:latest --restart=Never --rm -it busybox -- sh If you don't see a command prompt, try pressing enter. / # nslookup kubernetes.default.svc.cluster.local Server: 10.10.0.10 Address: 10.10.0.10:53 Name: kubernetes.default.svc.cluster.local Address: 10.10.0.1 *** Can't find kubernetes.default.svc.cluster.local: No answer / # nslookup tomcat.default.svc.cluster.local Server: 10.10.0.10 Address: 10.10.0.10:53 Name: tomcat.default.svc.cluster.local Address: 10.10.13.139 # 10.10.0.10就是coredns的ip,10.10.13.139就是tomcat的IP了，说明coreDNS已经配置好了 解析内部Service的名称，是通过coreDNS去解析
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