Kubernetes概述
使用kubeadm快速部署一个k8s集群
Kubernetes高可用集群二进制部署（一）主机准备和负载均衡器安装
Kubernetes高可用集群二进制部署（二）ETCD集群部署
Kubernetes高可用集群二进制部署（三）部署api-server
Kubernetes高可用集群二进制部署（四）部署kubectl和kube-controller-manager、kube-scheduler
Kubernetes高可用集群二进制部署（五）kubelet、kube-proxy、Calico、CoreDNS
Kubernetes高可用集群二进制部署（六）Kubernetes集群节点添加
1. 配置免密登录
在k8s-master1上操作
生成密钥对，把公钥复制到远程主机
ssh-keygen
#直接回车，不设置密码
ssh-copy-id root@k8s-master1
ssh-copy-id root@k8s-master2
ssh-copy-id root@k8s-master3
ssh-copy-id root@k8s-worker1
ssh root@k8s-master1
#依次此时是否能否正常登录
2 部署ETCD集群
在k8s-master1上操作。
2.1 创建工作目录
mkdir -p /data/k8s-work
2.2 获取cfssl工具
cd /data/k8s-work
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
说明：
cfssl是使用go编写，由CloudFlare开源的一款PKI/TLS工具。主要程序有：
- cfssl，是CFSSL的命令行工具
- cfssljson用来从cfssl程序获取JSON输出，并将证书，密钥，CSR和bundle写入文件中。
chmod +x cfssl*
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
# cfssl version
Version: 1.2.0
Revision: dev
Runtime: go1.6
2.3 创建CA证书
在master1上创建证书
2.3.1 配置ca证书请求文件
在当前目录/data/k8s-work执行
cat > ca-csr.json <<"EOF"
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
],
"ca": {
"expiry": "87600h"
}
}
EOF
2.3.2 创建ca证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
2.3.3 配置ca证书策略
cat > ca-config.json <<"EOF"
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
EOF
server auth 表示client可以对使用该ca对server提供的证书进行验证
client auth 表示server可以使用该ca对client提供的证书进行验证
2.4 创建etcd证书
2.4.1 配置etcd请求文件
一般可以部署三台集群，可以是3、5、7、9
cat > etcd-csr.json <<"EOF"
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.10.103",
"192.168.10.104",
"192.168.10.105"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}]
}
EOF
2.4.2 生成etcd证书
确保在当前目录有ca-key.pem、ca-config.json、etcd-csr.json文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
# ls
输出
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem etcd.csr etcd-csr.json etcd-key.pem etcd.pem
etcd.csr：etcd证书请求文件
etcd-key.pem：私钥
etcd.pem：基于私钥签发的证书
2.5 部署etcd集群
2.5.1 下载etcd软件包
etcd releases
wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz
2.5.2 安装etcd软件
tar -xvf etcd-v3.5.2-linux-amd64.tar.gz
cp -p etcd-v3.5.2-linux-amd64/etcd* /usr/local/bin/
#-p 保留源文件的权限
2.5.3 分发etcd软件
scp etcd-v3.5.2-linux-amd64/etcd* k8s-master2:/usr/local/bin/
scp etcd-v3.5.2-linux-amd64/etcd* k8s-master3:/usr/local/bin/
2.5.4 创建配置文件
在三个etcd节点操作
mkdir /etc/etcd
其中地址都是当前主机的ip本身
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.10.103:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.10.103:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.103:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.103:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.10.103:2380,etcd2=https://192.168.10.104:2380,etcd3=https://192.168.10.105:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
说明：
ETCD_NAME：节点名称，集群中唯一
ETCD_DATA_DIR：数据目录
ETCD_LISTEN_PEER_URLS：集群通信监听地址
ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址
ETCD_INITIAL_ADVERTISE_PEER_URLS：集群通告地址
ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
ETCD_INITIAL_CLUSTER：集群节点地址
ETCD_INITIAL_CLUSTER_TOKEN：集群Token
ETCD_INITIAL_CLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群
2.5.5 创建服务配置文件
mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd
cd /data/k8s-work
cp ca*.pem /etc/etcd/ssl
cp etcd*.pem /etc/etcd/ssl
cat > /etc/systemd/system/etcd.service <<"EOF"
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-client-cert-auth \
--client-cert-auth
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
2.5.6 同步etcd配置到集群其它master节点
创建目录
mkdir -p /etc/etcd
mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd
服务配置文件,需要修改etcd节点名称及IP地址
for i in k8s-master2 k8s-master3
do
scp /etc/etcd/etcd.conf $i:/etc/etcd/
done
k8s-master2:
cat /etc/etcd/etcd.conf
#[Member]
ETCD_NAME="etcd2"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.10.104:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.10.104:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.104:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.104:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.10.103:2380,etcd2=https://192.168.10.104:2380,etcd3=https://192.168.10.105:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
k8s-master3:
cat /etc/etcd/etcd.conf
#[Member]
ETCD_NAME="etcd3"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.10.105:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.10.105:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.105:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.105:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.10.103:2380,etcd2=https://192.168.10.104:2380,etcd3=https://192.168.10.105:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
证书文件
for i in k8s-master2 k8s-master3
do
scp /etc/etcd/ssl/* $i:/etc/etcd/ssl
done
服务启动配置文件
for i in k8s-master2 k8s-master3
do
scp /etc/systemd/system/etcd.service $i:/etc/systemd/system/
done
2.5.7 启动etcd集群
三台主机全都执行
systemctl daemon-reload
systemctl enable --now etcd.service #现在开启并设置开机自启
systemctl status etcd
2.5.8 验证集群状态
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.10.103:2379,https://192.168.10.104:2379,https://192.168.10.105:2379 endpoint health
文章来源：https://www.toymoban.com/news/detail-624330.html
+-----------------------------+--------+------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+-----------------------------+--------+------------+-------+
| https://192.168.10.103:2379 | true | 6.961777ms | |
| https://192.168.10.105:2379 | true | 6.594067ms | |
| https://192.168.10.104:2379 | true | 6.835899ms | |
+-----------------------------+--------+------------+-------+
耗时较长的话可以做一些优化工作文章来源地址https://www.toymoban.com/news/detail-624330.html
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