1、安装要求
在开始之前,部署kubernetes集群机器需要满足以下几个条件:
(1)一台或多台机器,操作系统Centos 7.x
(2)硬件配置:2GB或更多RAM,2个CPU或更多CPU,硬盘30G或更多
(3)集群中所有机器之间网络互通
(4)可以访问外网,需要拉取镜像,如果服务器不能上网,需要提前下载镜像并导入节点
(5)禁止swap分区
服务器规划:
角色 | IP | 组件 |
---|---|---|
k8s-master | 192.168.126.6 | kube-apiserver,kube-controller-manager,kube-scheduler,etcd |
k8s-node1 | 192.168.126.7 | kubelet,kube-proxy,docker etcd |
k8s-node2 | 192.168.126.8 | kubelet,kube-proxy,docker etcd |
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 <hostname>
# 在 master 添加 hosts
cat >> /etc/hosts << EOF
192.168.126.6 m1
192.168.126.7 n1
192.168.126.8 n2
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
3、为etcd和apiserver自签证书
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。
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
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
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
3.2、生成Etcd证书
(1)自签证书颁发机构(CA)
创建工作目录:
mkdir -p ~/TLS/{etcd,k8s}
cd TLS/etcd
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
生成证书:
$ cfssl gencert -initca ca-csr.json | cfssljson -bare ca
$ ls *pem
$ ca-key.pem ca.pem
(2)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": [
"192.168.126.6",
"192.168.126.7",
"192.168.126.8"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
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
生成证书
:
$ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
$ ls server*pem
$ server-key.pem server.pe
4、部署etcd集群
Etcd 是一个分布式键值存储系统,Kubernetes 使用 Etcd 进行数据存储,所以先准备
一个 Etcd 数据库,为解决 Etcd 单点故障,应采用集群方式部署,这里使用 3 台组建集
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
节点名称 | IP |
---|---|
etcd-1 | 192.168.126.6 |
etcd-2 | 192.168.126.7 |
etcd-3 | 192.168.126.8 |
4.1、从 Github 下载二进制文件
下载地址:https://github.com/etcd-io/etcd/releases/download/v3.4.9/etcd-v3.4.9-linux-amd64.tar.gz
4.2、部署 Etcd 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 -p /opt/etcd/{bin,cfg,ssl}
tar zxvf etcd-v3.4.9-linux-amd64.tar.gz
mv etcd-v3.4.9-linux-amd64/{etcd,etcdctl} /opt/etcd/bin
(2)创建 etcd配置文件(将下面的IP设置成自己的IP
)
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://192.168.126.6:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.126.6:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.126.6:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.126.6:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.126.6:2380,etcd-2=https://192.168.126.7:2380,etcd-3=https://192.168.126.8:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
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
(3)systemd 管理 etc
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 ~/TLS/etcd/ca*pem ~/TLS/etcd/server*pem /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@192.168.126.7:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.126.7:/usr/lib/systemd/system/
scp -r /opt/etcd/ root@192.168.126.8:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.126.8:/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-1" # 修改此处,节点 2 改为 etcd-2,节点 3 改为 etcd-3ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.71:2380" # 修改此处为当前服务器 IP
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.71:2379" # 修改此处为当前服务器 IP
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.71:2380" # 修改此处为当前
服务器 IP
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.71:2379" # 修改此处为当前服务器
IP
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.31.71:2380,etcd-2=https://192.168.31.72:2380,etcd-3=https://192.168.31.73:2380"
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
[root@m1 cfg]# 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://192.168.126.6:2379,https://192.168.126.7:2379,https://192.168.126.8:2379" endpoint health --write-out=table
+----------------------------+--------+-------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+----------------------------+--------+-------------+-------+
| https://192.168.126.6:2379 | true | 13.000265ms | |
| https://192.168.126.7:2379 | true | 13.372518ms | |
| https://192.168.126.8:2379 | true | 12.893033ms | |
+----------------------------+--------+-------------+-------+
如果输出上面信息,就说明集群部署成功。如果有问题第一步先看日志:
/var/log/message 或 journalctl -u etcd
5、安装docker
下载地址:https://download.docker.com/linux/static/stable/x86_64/docker-19.03.9.tgz
以下在所有节点操作。这里采用二进制安装,用yum安装也一样。
5.1、解压二进制包
tar zxvf docker-19.03.9.tgz
mv docker/* /usr/bin
5.2、systemd管理docker
cat > /usr/lib/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
EOF
5.3、创建配置文件
mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
- registry-mirrors 阿里云镜像加速器
5.4、启动并设置开机启动
systemctl daemon-reload
systemctl start docker
systemctl enable docker
6、部署master组件
6.1、生成kube-apiserver证书
(1)自签证书颁发机构(CA)
cd ~/TLS/k8s
cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat > ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
(2)生成证书
[root@m1 k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2021/06/30 02:37:02 [INFO] generating a new CA key and certificate from CSR
2021/06/30 02:37:02 [INFO] generate received request
2021/06/30 02:37:02 [INFO] received CSR
2021/06/30 02:37:02 [INFO] generating key: rsa-2048
2021/06/30 02:37:03 [INFO] encoded CSR
2021/06/30 02:37:03 [INFO] signed certificate with serial number 83651061574739871943508816364593446909545017239
会生成ca.pem和ca-key.pem文件。
(3)使用自签CA签发kube-apiserver HTTPS证书
创建证书申请文件:
[root@m1 ~]# cd ~/TLS/k8s
cat > server-csr.json << EOF
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.126.6",
"192.168.126.7",
"192.168.126.8",
"192.168.126.9",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
注:上述文件hosts字段中IP为所有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。
生成证书:
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
会生成server.pem和server-key.pem文件。
6.2、从Github下载二进制文件
下载地址:
https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md
注:打开链接你会发现里面有很多包,下载一个 server 包就够了,包含了 Master 和 Worker Node 二进制文件。
6.3、解压二进制包
[root@m1 ~]# mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
[root@m1 ~]# tar zxvf kubernetes-server-linux-amd64.tar.gz
[root@m1 ~]# cd kubernetes/server/bin
[root@m1 bin]# cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin/
[root@m1 bin]# cp kubectl /usr/bin/
6.4、部署kube-apiserver
(1)创建配置文件
cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://192.168.126.6:2379,https://192.168.126.7:2379,https://192.168.126.8:2379 \\
--bind-address=192.168.126.6 \\
--secure-port=6443 \\
--advertise-address=192.168.126.6 \\
--allow-privileged=true \\
--service-cluster-ip-range=10.0.0.0/24 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-32767 \\
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \\
--tls-cert-file=/opt/kubernetes/ssl/server.pem \\
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--service-account-issuer=api \\
--service-account-signing-key-file=/opt/kubernetes/ssl/server-key.pem \\
--etcd-cafile=/opt/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--requestheader-client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--proxy-client-cert-file=/opt/kubernetes/ssl/server.pem \\
--proxy-client-key-file=/opt/kubernetes/ssl/server-key.pem \\
--requestheader-allowed-names=kubernetes \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF
注:上面两个\ \ 第一个是转义符,第二个是换行符,使用转义符是为了使用EOF 保留换行符。
• --logtostderr:启用日志
• ---v:日志等级
• --log-dir:日志目录
• --etcd-servers:etcd集群地址
• --bind-address:监听地址
• --secure-port:https安全端口
• --advertise-address:集群通告地址
• --allow-privileged:启用授权
• --service-cluster-ip-range:Service虚拟IP地址段
• --enable-admission-plugins:准入控制模块
• --authorization-mode:认证授权,启用RBAC授权和节点自管理
• --enable-bootstrap-token-auth:启用TLS bootstrap机制
• --token-auth-file:bootstrap token文件
• --service-node-port-range:Service nodeport类型默认分配端口范围
• --kubelet-client-xxx:apiserver访问kubelet客户端证书
• --tls-xxx-file:apiserver https证书
• 1.20版本必须加的参数:--service-account-issuer,--service-account-signing-key-file
• --etcd-xxxfile:连接Etcd集群证书
• --audit-log-xxx:审计日志
• 启动聚合层相关配置:--requestheader-client-ca-file,--proxy-client-cert-file,--proxy-client-key-file,--requestheader-allowed-names,--requestheader-extra-headers-prefix,--requestheader-group-headers,--requestheader-username-headers,--enable-aggregator-routing
(2)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:
[root@m1 ~]# cp ~/TLS/k8s/ca*pem ~/TLS/k8s/server*pem /opt/kubernetes/ssl/
(3)启用 TLS Bootstrapping 机制
TLS Bootstraping:Master apiserver 启用 TLS 认证后,Node 节点 kubelet 和 kube- proxy 要与 kube-apiserver 进行通信,必须使用 CA 签发的有效证书才可以,当 Node节点很多时,这种客户端证书颁发需要大量工作,同样也会增加集群扩展复杂度。为了简化流程,Kubernetes 引入了 TLS bootstraping 机制来自动颁发客户端证书,kubelet会以一个低权限用户自动向 apiserver 申请证书,kubelet 的证书由 apiserver 动态签署。所以强烈建议在 Node 上使用这种方式,目前主要用于 kubelet,kube-proxy 还是由我们统一颁发一个证书。
TLS bootstraping 工作流程:
创建上述配置文件中 token 文件:
cat > /opt/kubernetes/cfg/token.csv << EOF
c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper"
EOF
格式:token,用户名,UID,用户组
token 也可自行生成替换:
head -c 16 /dev/urandom | od -An -t x | tr -d ' '
(4)systemd 管理 apiserve
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
(5)并设置开机启动
systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver
6.5、部署 kube-controller-manage
(1)创建配置文件
cat > /opt/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/16 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--cluster-signing-duration=87600h0m0s"
EOF
• --kubeconfig:连接apiserver配置文件
• --leader-elect:当该组件启动多个时,自动选举(HA)
• --cluster-signing-cert-file/--cluster-signing-key-file:自动为kubelet颁发证书的CA,与apiserver保持一致
(2)生成kubeconfig文件
生成kube-controller-manager证书:
# 切换工作目录
cd ~/TLS/k8s
# 创建证书请求文件
cat > kube-controller-manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
生成kubeconfig文件(以下是shell命令,直接在终端执行):
KUBE_CONFIG="/opt/kubernetes/cfg/kube-controller-manager.kubeconfig"
KUBE_APISERVER="https://192.168.126.6:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-controller-manager \
--client-certificate=./kube-controller-manager.pem \
--client-key=./kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-controller-manager \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
(3)systemd 管理 controller-manage
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
(4)启动并设置开机启动
systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager
6.6、部署 kube-scheduler
(1)创建配置文件
cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect \\
--kubeconfig=/opt/kubernetes/cfg/kube-scheduler.kubeconfig \\
--bind-address=127.0.0.1"
EOF
• --kubeconfig:连接apiserver配置文件
• --leader-elect:当该组件启动多个时,自动选举(HA)
(2)生成kubeconfig文件
生成kube-scheduler证书:
# 切换工作目录
cd ~/TLS/k8s
# 创建证书请求文件
cat > kube-scheduler-csr.json << EOF
{
"CN": "system:kube-scheduler",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
生成kubeconfig文件(以下是shell命令,直接在终端执行):
KUBE_CONFIG="/opt/kubernetes/cfg/kube-scheduler.kubeconfig"
KUBE_APISERVER="https://192.168.126.6:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-scheduler \
--client-certificate=./kube-scheduler.pem \
--client-key=./kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-scheduler \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
(3)systemd 管理 schedule
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
(4)启动并设置开机启动
systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-schedule
(5)查看集群状态
生成kubectl连接集群的证书:
# 切换工作目录
cd ~/TLS/k8s
cat > admin-csr.json <<EOF
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
生成kubeconfig文件:
mkdir /root/.kube
KUBE_CONFIG="/root/.kube/config"
KUBE_APISERVER="https://192.168.126.6:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials cluster-admin \
--client-certificate=./admin.pem \
--client-key=./admin-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=cluster-admin \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
通过kubectl工具查看当前集群组件状态:
[root@m1 k8s]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
scheduler Healthy ok
6.7、授权kubelet-bootstrap用户允许请求证书
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
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