【实战加详解】二进制部署k8s高可用集群教程系列九 -部署 scheduler
[!TIP]
二进制部署k8s- 部署kube-scheduler
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部署 kube-scheduler
kube-scheduler 作为 kube-apiserver 的调度器，需要访问 kube-apiserver 的服务，所以需要 kube-apiserver 的 ca
机构为其签发客户端 client 证书。
这里 kube-controller 部署在 kube-apiserver 的服务器上，不单独部署。
ip 设置成 kube-apiserver 的一样的就行。
1.生成 ssl 证书
1-1.创建 csr 请求文件
[!NOTE]
CN参数表示用户名，必须设置为k8s中设定的system:kube-scheduler
O参数表示用户组，必须设置为k8s中设定的system:kube-scheduler
kubernetes内置的ClusterRoleBindings中，system:kube-scheduler赋予kube-scheduler
工作所需的权限。
kube-schduler同样作为客户端，不需要设置hosts参数。
cat > /ssl/apiserver-scheduler-client-csr.json <<EOF
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "system"
}
]
}
EOF
cd /ssl/ && \
cfssl gencert \
-ca=apiserver-ca.pem \
-ca-key=apiserver-ca-key.pem \
-config=ca-config.json \
-profile=client apiserver-scheduler-client-csr.json | \
cfssljson -bare apiserver-scheduler-client && \
ls apiserver-scheduler-client* | \
grep apiserver-scheduler-client
2.分发证书
scp /ssl/apiserver-scheduler-client*.pem root@172.16.222.121:/etc/kubernetes/pki/apiserver/ && \
scp /ssl/apiserver-scheduler-client*.pem root@172.16.222.122:/etc/kubernetes/pki/apiserver/ && \
scp /ssl/apiserver-scheduler-client*.pem root@172.16.222.123:/etc/kubernetes/pki/apiserver/
3.创建 kubeconfig
[!NOTE]
kube-scheduler是使用kubeconfig跟kube-apiserver进行通信的。
kubeconfig配置文件中会包含了kube-scheduler的客户端client证书信息以及身份信息。
需要在每台服务器都创建该请求文件。
以下操作在每台master服务器创建，ip地址设置为本地的kube-apiserver的服务地址ip。
3-1.在 master-01 创建
设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/apiserver/apiserver-ca.pem \
--embed-certs=true \
--server=https://172.16.222.121:6443 \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置客户端认证参数
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client.pem \
--client-key=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置上下文参数
kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置当前上下文参数
kubectl config use-context system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
3-2.在 master-02 创建
设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/apiserver/apiserver-ca.pem \
--embed-certs=true \
--server=https://172.16.222.122:6443 \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置客户端认证参数
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client.pem \
--client-key=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置上下文参数
kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置当前上下文参数
kubectl config use-context system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
3-3.在 master-03 创建
设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/apiserver/apiserver-ca.pem \
--embed-certs=true \
--server=https://172.16.222.123:6443 \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置客户端认证参数
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client.pem \
--client-key=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置上下文参数
kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
设置当前上下文参数
kubectl config use-context system:kube-scheduler \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig
4.启动服务
4-1.创建启动配置文件
[!NOTE]
每台master服务器都要创建。每台服务器的启动配置文件一样。
注意：以下的配置中，日志等级设置为：4。日志产生的速度会非常快。学习部署后可以设置为：2。
cat > /etc/kubernetes/config/scheduler.conf <<EOF
KUBE_SCHEDULER_OPTS="--bind-address=127.0.0.1 \
--secure-port=10259 \
--client-ca-file=/etc/kubernetes/pki/apiserver/apiserver-ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver/apiserver-scheduler-client-key.pem \
--kubeconfig=/etc/kubernetes/kubeconfig/scheduler.kubeconfig \
--leader-elect=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes/scheduler/ \
--v=4"
EOF
4-2.创建服务启动项
[!NOTE]
需要在每台master服务器创建。每台服务器的启动项一样。
cat > /usr/lib/systemd/system/kube-scheduler.service <<'EOF'
[Unit]
Description=Kubernetes Scheduler Service
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/config/scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
5.启动服务
启动服务
systemctl daemon-reload && \
systemctl start kube-scheduler
6.验证
使用 kubectl 查看 kube-apiserver 是否可以访问到 kube-scheduler
kubectl get cs
显示
[!NOTE]
可以看到kube-controller-manager和kube-scheduler的STATUS都为Healthy。
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
etcd-0 Healthy {"health":"true","reason":""}
etcd-1 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""}
scheduler Healthy ok
7.设置开机启动
正常启动且没有任何错误，设置开机自动启动服务。
systemctl enable kube-scheduler
8.其他操作
停止服务
systemctl stop kube-scheduler
查看状态
systemctl status kube-scheduler
查看服务运行状态
journalctl -l --no-pager -u kube-scheduler
至此。kube-scheduler 部署成功。
转载请注明出处：https://janrs.com
