kubernetes二进制部署
1、环境规划
软件 | 版本 |
Linux操作系统 | CentOS Linux release 7.6.1810 (Core) |
Kubernetes | 1.9 |
Docker | 18.09.3 |
etcd | 3.3.10 |
角色 | IP | 组件 | 推荐配置 |
k8s_master etcd01 | 192.168.1.153 | kube-apiserver kube-controller-manager kube-scheduler etcd | CPU 2核+ 2G内存+ |
k8s_node01 etcd02 | 192.168.1.154 | kubelet kube-proxy docker flannel etcd | |
k8s_node02 etcd03 | 192.168.1.155 | kubelet kube-proxy docker flannel etcd |
2、 单Master集群架构
3、 系统常规参数配置
3.1 关闭selinux
sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/‘ /etc/selinux/config
setenforce 0
3.2 文件数调整
sed -i ‘/* soft nproc 4096/d‘ /etc/security/limits.d/20-nproc.conf
echo ‘* - nofile 65536‘ >> /etc/security/limits.conf
echo ‘* soft nofile 65535‘ >> /etc/security/limits.conf
echo ‘* hard nofile 65535‘ >> /etc/security/limits.conf
echo ‘fs.file-max = 65536‘ >> /etc/sysctl.conf
3.3 防火墙关闭
systemctl disable firewalld.service
systemctl stop firewalld.service
3.4 常用工具安装及时间同步
yum -y install vim telnet iotop openssh-clients openssh-server ntp net-tools.x86_64 wget
ntpdate time.windows.com
3.5 hosts文件配置(3个节点)
vim /etc/hosts
192.168.1.153 k8s_master
192.168.1.154 k8s_node01
192.168.1.155 k8s_node02
3.6 服务器之间免密钥登录
ssh-keygen
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.154
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.155
4、 自签ssl证书
4.1 etcd生成证书
cfssl.sh | etcd-cert.sh | etcd.sh |
4.1.1 安装cfssl工具（cfssl.sh）
cd /home/k8s_install/ssl_etcd
chmod +x cfssl.sh
./cfssl.sh
内容如下：
curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
4.1.2 生成etcd 自签ca证书（etcd-cert.sh）
chmod +x etcd-cert.sh
./etcd-cert.sh
内容如下：
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 –
#-----------------------
cat > server-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"192.168.1.153",
"192.168.1.154",
"192.168.1.155",
"192.168.1.156",
"192.168.1.157"
],
"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
注意：hosts一定要包含所有节点，可以多部署几个预留节点以便后续扩容，否则还需要重新生成
4.1.3 etcd二进制包安装
#存放配置文件，可执行文件，证书文件
mkdir /opt/etcd/{cfg,bin,ssl} -p
#ssl 证书切记复制到/opt/etcd/ssl/
cp {ca,server-key,server}.pem /opt/etcd/ssl/
#部署etcd以及增加etcd服务(etcd.sh)
cd /home/k8s_install/soft/
tar -zxvf etcd-v3.3.10-linux-amd64.tar.gz
cd etcd-v3.3.10-linux-amd64
mv etcd etcdctl /opt/etcd/bin/