1、前置准备
1.1 环境准备
服务器要求:
- 建议最小硬件配置:2核CPU、2G内存、30G硬盘
- 服务器最好可以访问外网,会有从网上拉取镜像需求,如果服务器不能上网,需要提前下载对应镜像并导入节点
软件环境:
软件 | 版本 |
---|---|
OS | CentOS Linux release 7.9.2009 (Core) |
Docker | |
Kubernetes |
服务器整体规划:
角色 | IP | 组件 |
---|---|---|
k8s-master1 | 192.168.6.20 | docker,etcd,nginx,keepalived |
k8s-master2 | 192.168.6.21 | docker,etcd,nginx,keepalived |
k8s-node1 | 192.168.6.22 | docker,etcd |
负载均衡 | 192.168.6.88(VIP) |
架构图:
1.2 操作系统初始化
# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
# 关闭selinux
sed -i ‘s/enforcing/disabled/‘ /etc/selinux/config # 永久
setenforce 0 # 临时
# 关闭swap
swapoff -a # 临时
sed -ri ‘s/.swap./#&/‘ /etc/fstab # 永久
# 根据规划设置主机名
hostnamectl set-hostname k8s-master1
>
hostnamectl set-hostname k8s-master2hostnamectl set-hostname k8s-node1
# 在master添加hosts
cat >> /etc/hosts << EOF
192.168.6.20 k8s-master1
192.168.6.21 k8s-master2
192.168.6.22 k8s-node1
EOF
# 将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl —system # 生效
# 时间同步
yum install ntpdate -y
ntpdate time.windows.com
>
2、 部署Nginx+Keepalived高可用负载均衡器
Kubernetes作为容器集群系统,通过健康检查+重启策略实现了Pod故障自我修复能力,通过调度算法实现将Pod分布式部署,并保持预期副本数,根据Node失效状态自动在其他Node拉起Pod,实现了应用层的高可用性。
针对Kubernetes集群,高可用性还应包含以下两个层面的考虑:Etcd数据库的高可用性和Kubernetes Master组件的高可用性。 而kubeadm搭建的K8s集群,Etcd只起了一个,存在单点,所以我们这里会独立搭建一个Etcd集群。
Master节点扮演着总控中心的角色,通过不断与工作节点上的Kubelet和kube-proxy进行通信来维护整个集群的健康工作状态。如果Master节点故障,将无法使用kubectl工具或者API做任何集群管理。
Master节点主要有三个服务kube-apiserver、kube-controller-manager和kube-scheduler,其中kube-controller-manager和kube-scheduler组件自身通过选择机制已经实现了高可用,所以Master高可用主要针对kube-apiserver组件,而该组件是以HTTP API提供服务,因此对他高可用与Web服务器类似,增加负载均衡器对其负载均衡即可,并且可水平扩容。
kube-apiserver高可用架构图:
- Nginx是一个主流Web服务和反向代理服务器,这里用四层实现对apiserver实现负载均衡。
- Keepalived是一个主流高可用软件,基于VIP绑定实现服务器双机热备,在上述拓扑中,Keepalived主要根据Nginx运行状态判断是否需要故障转移(偏移VIP),例如当Nginx主节点挂掉,VIP会自动绑定在Nginx备节点,从而保证VIP一直可用,实现Nginx高可用。
注:为了节省机器,这里与K8s master节点机器复用。也可以独立于k8s集群之外部署,只要nginx与apiserver能通信就行。
2.1 安装软件包(主备)
nginx安装:https://nginx.org/en/linux_packages.html#RHEL-CentOS
安装需要的依赖: yum install -y gcc yum install -y pcre pcre-devel yum install -y zlib zlib-devel yum install -y openssl openssl-devel rpm -q pcre pcre-devel openssl openssl-devel
keepalived安装:
keepalived官方:https://www.keepalived.org/download.html
yum -y install keepalived
2.2 Nginx配置文件(主/备一样)
cat > /etc/nginx/nginx.conf << "EOF"
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log notice;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
# 四层负载均衡,为两台Master apiserver组件提供负载均衡
stream {
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.6.20:6443; # Master1 APISERVER IP:PORT
server 192.168.6.21:6443; # Master2 APISERVER IP:PORT
}
server {
listen 16443; # 由于nginx与master节点复用,这个监听端口不能是6443,否则会冲突
proxy_pass k8s-apiserver;
}
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$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;
keepalive_timeout 65;
#gzip on;
include /etc/nginx/conf.d/*.conf;
}
EOF
2.3 Keepalive配置文件(Nginx Master)
cat > /etc/keepalived/keepalived.conf << EOF
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 # 修改为实际网卡名
virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的
priority 100 # 优先级,备服务器设置 90
advert_int 1 # 指定VRRP 心跳包通告间隔时间,默认1秒
authentication {
auth_type PASS
auth_pass 1111
}
# 虚拟IP
virtual_ipaddress {
192.168.6.88/24
}
track_script {
check_nginx
}
}
EOF
- 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)
- virtual_ipaddress:虚拟IP(VIP)
- virtual_router_id 确保主备一致
准备上述配置文件中检查nginx运行状态的脚本:
cat > /etc/keepalived/check_nginx.sh << "EOF"
#!/bin/bash
count=$(ss -antp |grep 16443 |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
exit 1
else
exit 0
fi
EOF
chmod +x /etc/keepalived/check_nginx.sh
2.4 Keepalive配置文件(Nginx Backup)
cat > /etc/keepalived/keepalived.conf << EOF
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_BACKUP
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.6.88/24
}
track_script {
check_nginx
}
}
EOF
准备上述配置文件中检查nginx运行状态的脚本:
cat > /etc/keepalived/check_nginx.sh << "EOF"
#!/bin/bash
count=$(ss -antp |grep 16443 |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
exit 1
else
exit 0
fi
EOF
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。
2.5 启动并设置开机启动
systemctl daemon-reload
systemctl start nginx
systemctl start keepalived
systemctl enable nginx
systemctl enable keepalived
2.6 查看keepalived工作状态
- 网卡是否绑定了VIP
2.7 Nginx+Keepalived高可用测试
- 关闭主节点Nginx,测试VIP是否漂移到备节点服务器。
- 在Nginx Master执行 pkill nginx
在Nginx Backup,ip addr命令查看已成功绑定VIP。
3、ETCD集群部署
Etcd 是一个分布式键值存储系统,Kubernetes使用Etcd进行数据存储,kubeadm搭建默认情况下只启动一个Etcd Pod,存在单点故障,生产环境强烈不建议,所以我们这里使用3台服务器组建集群,可容忍1台机器故障,当然,你也可以使用5台组建集群,可容忍2台机器故障。
节点名称 | IP |
---|---|
etcd-1 | 192.168.6.20 |
etcd-2 | 192.168.6.21 |
etcd-3 | 192.168.6.22 |
注:为了节省机器,这里与K8s节点机器复用。也可以独立于k8s集群之外部署,只要apiserver能连接到就行。
3.1 准备cfssl证书生成工具
cfssl是一个开源的证书管理工具,使用json文件生成证书,相比openssl更方便使用。
找任意一台服务器操作,这里用Master节点。
https://github.com/cloudflare/cfssl
cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64 chmod +x /usr/local/bin/cfssl*
3.2 自签ETCD证书
- 自签证书颁发机构(CA)
mkdir -p ~/etcd_tls
cd ~/etcd_tls
自签CA:
cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat > ca-csr.json << EOF
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
会生成ca.pem和ca-key.pem文件。
- 使用自签CA签发Etcd HTTPS证书
创建证书申请文件:
cat > server-csr.json << EOF
{
"CN": "etcd",
"hosts": [
"192.168.6.20",
"192.168.6.21",
"192.168.6.22"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
会生成server.pem和server-key.pem文件。
注:上述文件hosts字段中IP为所有etcd节点的集群内部通信IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。
3.3 从Github下载二进制文件
3.4 部署集群
以下在节点1上操作,为简化操作,待会将节点1生成的所有文件拷贝到节点2和节点3。
1. 创建工作目录并解压二进制包
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.5.0-linux-amd64.tar.gz
mv etcd-v3.5.0-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
2. 创建etcd配置文件
cat > /opt/etcd/cfg/etcd.conf << EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.6.20:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.6.20:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.6.20:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.6.20:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.6.20:2380,etcd-2=https://192.168.6.21:2380,etcd-3=https://192.168.6.22:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
• ETCD_NAME:节点名称,集群中唯一
• ETCDDATADIR:数据目录
• ETCDLISTENPEER_URLS:集群通信监听地址
• ETCDLISTENCLIENT_URLS:客户端访问监听地址
• ETCDINITIALADVERTISEPEERURLS:集群通告地址
• ETCDADVERTISECLIENT_URLS:客户端通告地址
• ETCDINITIALCLUSTER:集群节点地址
• ETCDINITIALCLUSTER_TOKEN:集群Token
• ETCDINITIALCLUSTER_STATE:加入集群的当前状态,new是新集群,existing表示加入已有集群
3. systemd管理etcd
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem \
--logger=zap
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
4. 拷贝刚才生成的证书
把刚才生成的证书拷贝到配置文件中的路径:
cp ~/etcd_tls/capem ~/etcd_tls/serverpem /opt/etcd/ssl/
5. 启动并设置开机启动
systemctl daemon-reload
systemctl start etcd
systemctl enable etcd
6. 将上面节点1所有生成的文件拷贝到节点2和节点3
scp -r /opt/etcd/ root@192.168.6.21:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.6.21:/usr/lib/systemd/system/
scp -r /opt/etcd/ root@192.168.6.22:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.6.22:/usr/lib/systemd/system/
然后在节点2和节点3分别修改etcd.conf配置文件中的节点名称和当前服务器IP:
vi /opt/etcd/cfg/etcd.conf
#[Member]
ETCD_NAME=”etcd-2” # 修改此处,节点2改为etcd-2,节点3改为etcd-3
ETCD_DATA_DIR=”/var/lib/etcd/default.etcd”
ETCD_LISTEN_PEER_URLS=”https://192.168.6.21:2380“ # 修改此处为当前服务器IP
ETCD_LISTEN_CLIENT_URLS=”https://192.168.6.21:2379“ # 修改此处为当前服务器IP
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS=”https://192.168.6.21:2380“ # 修改此处为当前服务器IP
ETCD_ADVERTISE_CLIENT_URLS=”https://192.168.6.21:2379“ # 修改此处为当前服务器IP
ETCD_INITIAL_CLUSTER=”etcd-1=https://192.168.6.20:2380,etcd-2=https://192.168.6.21:2380,etcd-3=https://192.168.6.22:2380“
ETCD_INITIAL_CLUSTER_TOKEN=”etcd-cluster”
ETCD_INITIAL_CLUSTER_STATE=”new”
最后启动etcd并设置开机启动,同上。
7. 查看集群状态
ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.6.20:2379,https://192.168.6.21:2379,https://192.168.6.22:2379" endpoint health --write-out=table
+---------------------------+--------+-------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+---------------------------+--------+-------------+-------+
| https://192.168.6.20:2379 | true | 13.658289ms | |
| https://192.168.6.22:2379 | true | 13.870048ms | |
| https://192.168.6.21:2379 | true | 13.591061ms | |
+---------------------------+--------+-------------+-------+
4、安装Docker/kubeadm/kubelet【所有节点】
这里使用Docker作为容器引擎,也可以换成别的,例如containerd
4.1 安装Docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce
systemctl enable docker && systemctl start docker
配置镜像加速器:
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
systemctl restart docker
docker info
4.2 添加阿里云YUM软件源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
4.3 安装kubeadm,kubelet和kubectl
由于版本更新频繁,这里指定版本号部署:
yum install -y kubelet-1.20.0 kubeadm-1.20.0 kubectl-1.20.0
systemctl enable kubelet
5、部署Kubernetes Master
5.1 初始化Master1
生成初始化配置文件:
cat > kubeadm-config.yaml << EOF
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: 9037x2.tcaqnpaqkra9vsbw
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 192.168.6.20
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock # kubelet中的插件连接docker
name: k8s-master1
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
certSANs: # 包含所有Master/LB/VIP IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。
- k8s-master1
- k8s-master2
- 192.168.6.20
- 192.168.6.21
- 192.168.6.88 # VIP
- 127.0.0.1
extraArgs:
authorization-mode: Node,RBAC
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 192.168.6.88:16443 # 负载均衡虚拟IP(VIP)和端口
controllerManager: {}
dns:
type: CoreDNS
etcd:
external: # 使用外部etcd
endpoints:
- https://192.168.6.20:2379 # etcd集群3个节点
- https://192.168.6.21:2379
- https://192.168.6.22:2379
caFile: /opt/etcd/ssl/ca.pem # 连接etcd所需证书
certFile: /opt/etcd/ssl/server.pem
keyFile: /opt/etcd/ssl/server-key.pem
imageRepository: registry.aliyuncs.com/google_containers # 由于默认拉取镜像地址k8s.gcr.io国内无法访问,这里指定阿里云镜像仓库地址
kind: ClusterConfiguration
kubernetesVersion: v1.20.0 # K8s版本,与上面安装的一致
networking:
dnsDomain: cluster.local
podSubnet: 10.244.0.0/16 # Pod网络,与下面部署的CNI网络组件yaml中保持一致
serviceSubnet: 10.96.0.0/12 # 集群内部虚拟网络,Pod统一访问入口
scheduler: {}
EOF
使用配置文件初始化引导:
kubeadm init --config kubeadm-config.yaml
...
[addons] Applied essential addon: kube-proxy
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:
kubeadm join 192.168.6.88:16443 --token 9037x2.tcaqnpaqkra9vsbw \
--discovery-token-ca-cert-hash sha256:25d7712faa2ea32756468c6989fdcdf5bd7418166b509973237e746a7f420f39 \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.6.88:16443 --token 9037x2.tcaqnpaqkra9vsbw \
--discovery-token-ca-cert-hash sha256:25d7712faa2ea32756468c6989fdcdf5bd7418166b509973237e746a7f420f39
初始化完成后,会有两个join的命令,带有 —control-plane 是用于加入组建多master集群的,不带的是加入节点的。
拷贝kubectl使用的连接k8s认证文件到默认路径:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/configkubectl get node
NAME STATUS ROLES AGE VERSIONk8s-master1 NotReady control-plane,master 4m4s v1.20.0
5.2 初始化Master2
将Master1节点生成的证书拷贝到Master2:
scp -r /etc/kubernetes/pki/ 192.168.6.21:/etc/kubernetes/
复制加入master join命令在master2执行:
kubeadm join 192.168.6.88:16443 —token 9037x2.tcaqnpaqkra9vsbw \ —discovery-token-ca-cert-hash sha256:25d7712faa2ea32756468c6989fdcdf5bd7418166b509973237e746a7f420f39 \ —control-plane
拷贝kubectl使用的连接k8s认证文件到默认路径:
mkdir -p $HOME/.kube注:由于网络插件还没有部署,还没有准备就绪 NotReady
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/configkubectl get node
NAME STATUS ROLES AGE VERSIONk8s-master1 NotReady control-plane,master 8m46s v1.20.0
k8s-master2 NotReady control-plane,master 18s v1.20.0
5.3 访问负载均衡器测试
找K8s集群中任意一个节点,使用curl查看K8s版本测试,使用VIP访问:
curl -k https://192.168.6.88:16443/version{
“major”: “1”,
“minor”: “20”,
“gitVersion”: “v1.20.0”,
“gitCommit”: “af46c47ce925f4c4ad5cc8d1fca46c7b77d13b38”,
“gitTreeState”: “clean”,
“buildDate”: “2020-12-08T17:51:19Z”,
“goVersion”: “go1.15.5”,
“compiler”: “gc”,
“platform”: “linux/amd64”
}
可以正确获取到K8s版本信息,说明负载均衡器搭建正常。
该请求数据流程:curl -> vip(nginx) -> apiserver
通过查看Nginx日志也可以看到转发apiserver IP:
tail /var/log/nginx/k8s-access.log -f192.168.6.21 192.168.6.21:6443 - [17/Sep/2021:15:53:23 +0800] 200 1096
192.168.6.21 192.168.6.20:6443 - [17/Sep/2021:15:53:23 +0800] 200 1096
…
6、加入Kubernetes Node
在192.168.6.22(Node)执行。
向集群添加新节点,执行在kubeadm init输出的kubeadm join命令:
kubeadm join 192.168.6.88:16443 —token 9037x2.tcaqnpaqkra9vsbw \ —discovery-token-ca-cert-hash sha256:25d7712faa2ea32756468c6989fdcdf5bd7418166b509973237e746a7f420f39
后续其他节点也是这样加入。
注:默认token有效期为24小时,当过期之后,该token就不可用了。这时就需要重新创建token,可以直接使用命令快捷生成:
kubeadm token create —print-join-command
7、部署网络组件-Calico
Calico是一个纯三层的数据中心网络方案,是目前Kubernetes主流的网络方案。
wget https://docs.projectcalico.org/manifests/calico.yaml修改pod的网段CALICO_IPV4POOL_CIDR
...
- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16" # 与初始化master1的配置文件的podSubnet保持一致
...
部署Calico:
kubectl apply -f calico.yaml
kubectl get pods -n kube-system
8、部署Dashboard
Dashboard是官方提供的一个UI,可用于基本管理K8s资源。
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml默认Dashboard只能集群内部访问,修改Service为NodePort类型,暴露到外部:
spec:
ports:
- port: 443
targetPort: 8443
nodePort: 30001
selector:
k8s-app: kubernetes-dashboard
type: NodePort
kubectl apply -f recommended.yaml
# 查看部署
kubectl get pods -n kubernetes-dashboard
访问地址:https://NodeIP:30001
创建service account 并绑定到默认的cluster-admin管理员集群角色:
# 创建用户
$ kubectl create serviceaccount dashboard-admin -n kube-system
# 用户授权
$ kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
# 获取用户Token
$ kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
注:使用输出的token登陆dashboard
9、部署Metrics Server
项目地址:https://github.com/kubernetes-sigs/metrics-server
wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.4.1/components.yaml
Deployment/metrics-server修改:
- —kubelet-insecure-tls 告诉metrics-server不验证kubelet提供的https证书
- —kubelet-preferred-address-types=InternalIP 使用节点IP连接kubelet
- image: geray/metrics-server:v0.4.1
10、master节点作为node使用
默认配置下Kubernetes不会将Pod调度到Master节点。如果希望将k8s-master也当作Node使用kubectl taint node k8s-master1 node-role.kubernetes.io/master-
11、部署Ingress
Kubernetes-v1.22+ 需要使用 ingress-nginx>=1.0,因为 networking.k8s.io/v1beta 已经移除
作者:cnsre运维博客链接:https://www.imooc.com/article/320464
来源:慕课网
curl https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.0/deploy/static/provider/baremetal/deploy.yaml > deploy.yaml
sed -i 's@k8s.gcr.io/ingress-nginx/controller:v1.0.0\(.*\)@geray/ingress-nginx-controller:v1.0.0@' deploy.yaml
sed -i 's@k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.0\(.*\)$@geray/kube-webhook-certgen:v1.0@' deploy.yaml
sed -i 's/Deployment/DaemonSet/g' deploy.yaml
# 预先拉取镜像
docker pull geray/ingress-nginx-controller:v1.0.0
docker pull geray/kube-webhook-certgen:v1.0
kubectl apply -f deploy.yaml
附件:直接apply即可