第六节Master节点部署组件
- 前提
在部署Kubernetes之前一定要确保etcd、flannel、docker是正常工作的，否则先解决问题再继续。
1 生成证书
创建CA证书：
# cat ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
# cat ca-csr.json
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
生成apiserver证书：
# cat server-csr.json
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.31.63",
"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"
}
]
}
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
生成kube-proxy证书：
# cat kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
最终生成以下证书文件：
ls *pem
ca-key.pem ca.pem kube-proxy-key.pem kube-proxy.pem server-key.pem server.pem
2 部署apiserver组件
下载二进制包：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md
下载这个包（kubernetes-server-linux-amd64.tar.gz）就够了，包含了所需的所有组件。
# mkdir /opt/kubernetes/{bin,cfg,ssl} -p
# tar zxvf kubernetes-server-linux-amd64.tar.gz
# cd kubernetes/server/bin
# cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin
创建token文件，用途后面会讲到：
# cat /opt/kubernetes/cfg/token.csv
674c457d4dcf2eefe4920d7dbb6b0ddc,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
- 第一列：随机字符串，自己可生成
- 第二列：用户名
- 第三列：UID
- 第四列：用户组
创建apiserver配置文件：
# cat /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.31.63:2379,https://192.168.31.65:2379,https://192.168.31.66:2379 \
--bind-address=192.168.31.63 \
--secure-port=6443 \
--advertise-address=192.168.31.63 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-50000 \
--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 \
--etcd-cafile=/opt/etcd/ssl/ca.pem \
--etcd-certfile=/opt/etcd/ssl/server.pem \
--etcd-keyfile=/opt/etcd/ssl/server-key.pem"
配置好前面生成的证书，确保能连接etcd。
参数说明：
- —logtostderr 启用日志
—-v 日志等级
—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功能，后面会讲到
—token-auth-file token文件
—service-node-port-range Service Node类型默认分配端口范围
systemd管理apiserver：
# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启动 kube-apiserver：
# systemctl daemon-reload
# systemctl enable kube-apiserver
# systemctl restart kube-apiserver
3 部署scheduler组件
创建schduler配置文件：
# cat /opt/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect"
参数说明：
- —master 连接本地apiserver
—leader-elect 当该组件启动多个时，自动选举（HA）
systemd管理schduler组件：
# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启动kube-scheduler：
# systemctl daemon-reload
# systemctl enable kube-scheduler
# systemctl restart kube-scheduler
4 部署controller-manager组件
创建controller-manager配置文件：
# cat /opt/kubernetes/cfg/kube-controller-manager
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect=true \
--address=127.0.0.1 \
--service-cluster-ip-range=10.0.0.0/24 \
--cluster-name=kubernetes \
--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"
systemd管理controller-manager组件：
# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启动kube-controller-manager：
# systemctl daemon-reload
# systemctl enable kube-controller-manager
# systemctl restart kube-controller-manager
所有组件都已经启动成功，通过kubectl工具查看当前集群组件状态：
# /opt/kubernetes/bin/kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
etcd-0 Healthy {"health":"true"}
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
controller-manager Healthy ok
如上输出说明组件都正常。
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