centos7.8二进制安装k8s
二进制安装k8s
下载链接：
etcd下载链接：https://github.com/etcd-io/etcd/releases
k8s组件下载：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.18.md#downloads-for-v1188
环境：centos7.8 x86_64
内核版本：3.10.0-1127.el7.x86_64
kubernets版本：v1.18.8
docker版本：18.0.9CE
环境架构：
k8s-master01| 192.168.54.161
k8s-work01 | 192.168.54.162
k8s-work02 | 192.168.54.163

第一阶段：
配置master节点：
第一步：etcd安装

[root@k8s-master01 ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target

[Service]
Type=simple
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd

[Install]
WantedBy=multi-user.target
touch /etc/etcd/etcd.conf
mkdir /var/lib/etcd/
systemctl daemon-reload
systemctl start etcd.service
systemctl status etcd.service

验证etcd是否正确启动：etcdctl endpoint health

问题：
如果有如下报错，检查WorkingDirectory、EnvironmentFile、ExecStart配置目录是否存在，没有则手动创建：

二、安装kube-apiserver服务
cd kubernetes/server/bin
cp kube-apiserver kube-controller-manager kube-scheduler /usr/local/bin/
[root@k8s-master01 ~]# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=kubernetes API Server
Documentation=https://github.com/GoogoleCloudPlatform/kubernetes
After=etcd.service
Wants=etcd.service

[Service]
EnvironmentFile=/etc/kubernetes/apiserver
ExecStart=/usr/local/bin/kube-apiserver $KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
[root@k8s-master01 ~]# cat /etc/kubernetes/apiserver
KUBE_API_ARGS="–etcd-servers=http://127.0.0.1:2379 --insecure-bind-address=0.0.0.0 --insecure-port=8080 --service-cluster-ip-range=169.169.0.0/16 --service-node-port-range=1-65535 --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota --logtostderr=false --log-dir=/var/log/kubernetes --v=0"

三、安装kube-controller-manager服务
[root@k8s-master01 ~]# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloundPlatform/kubernetes
After=kube-apiserver.service
Requires=kube-apiserver.service

[Service]
EnvironmentFile=/etc/kubernetes/controller-manager
ExecStart=/usr/local/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
[root@k8s-master01 ~]# cat /etc/kubernetes/controller-manager
KUBE_CONTROLLER_MANAGER_ARGS="–kubeconfig=/etc/kubernetes/kubeconfig --logtostderr=false --log-dir=/var/log/kubernetes --v=0"

[root@k8s-master01 ~]# cat /etc/kubernetes/kubeconfig
apiVersion: v1
kind: Config
users:

• name: client
  user:
  clusters:
• name: default
  cluster:
  server: http://192.168.54.161:8080
  contexts:
• context:
  cluster: default
  user: client
  name: default
  current-context: default

安装问题：

检查wantedBy是否写错

重启正常

四、安装配置kube-scheduler服务
[root@k8s-master01 ~]# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GooleCloudPlatform/kubernetes
After=kube-apiserver.service
Requires=kube-apiserver.service

[Service]
EnvironmentFile=/etc/kubernetes/scheduler
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
[root@k8s-master01 ~]# cat /etc/kubernetes/scheduler
KUBE_SCHEDULER_ARGS="–kubeconfig=/etc/kubernetes/kubeconfig --logtostderr=false --log-dir=/var/log/kubernetes --v=0"
五、启动服务
root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable kube-apiserver.service
systemctl start kube-apiserver.service
systemctl start kube-controller-manager.service
systemctl enable kube-controller-manager.service
[root@k8s-master01 ~]# systemctl enable kube-scheduler.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@k8s-master01 ~]# systemctl start kube-scheduler.service
[root@k8s-master01 ~]# systemctl status kube-scheduler.service

服务运行正常，则master上所需服务已全部启动完成

第二阶段：work节点上配置kubelet\kube-proxy服务
一、安装配置kubelet
1、在work节点上面安装配置docker
2、cp kubectl kube-proxy kubelet /usr/local/bin/
mkdir /var/lib/kubelet
[root@k8s-work01 bin]# mkdir /etc/kubernetes
[root@k8s-work01 bin]# vim /etc/kubernetes/kubelet
KUBELET_ARGS="–kubeconfig=/etc/kubernetes/kubeconfig --hostname-override=k8s-work01 --logtostderr=false --log-dir=/var/log/kubernetes --v=0"
mkdir /var/log/kubernetes
vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=/etc/kubernetes/kubelet
ExecStart=/usr/local/bin/kubelet $KUBELET_ARGS
Restart=on-failure

[Install]
WantedBy=multi-user.target
问题：
kubelet服务启动失败，检查swap是否关闭，相关目录是否创建，去/var/log/kubernetes中查看日志
二、安装配置kube-proxy服务
vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
Requires=network.service

[Service]
EnvironmentFile=/etc/kubernetes/proxy
ExecStart=/usr/local/bin/kube-proxy $KUBE_PROXY_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
[root@k8s-work01 ~]# cat /etc/kubernetes/proxy
KUBE_PROXY_ARGS="–kubeconfig=/etc/kubernetes/kubeconfig --logtostderr=false --log-dir=/var/log/kubernetes --v=2"
三、配置kubeconfig文件与master中一致
四、启动服务
systemctl start kubelet.service
systemctl enable kubelet.service
systemctl start kube-proxy.service
systemctl enable kube-proxy.service
测试：
在master节点查看节点，至此k8s已安装完毕，可以创建pod等