k8s1.13.0二进制部署-master节点（三）

部署apiserver

创建生成CSR的JSON配置文件

[root@k8s-master1 ssl]# vim kubernetes-csr.json
{
  "CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "192.168.0.123",
    "192.168.0.124",
    "192.168.0.130",
    "10.0.0.1",
    "kubernetes",
    "kubernetes.default",
    "kubernetes.default.svc",
    "kubernetes.default.svc.cluster",
    "kubernetes.default.svc.cluster.local"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

生成kubernetes证书和私钥

cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem 
   -ca-key=/opt/kubernetes/ssl/ca-key.pem 
   -config=/opt/kubernetes/ssl/ca-config.json 
   -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes

分发证书

[root@k8s-master1 ssl]# cp kubernetes*.pem /opt/kubernetes/ssl/

准备软件包

下载二进制包：https://github.com/kubernetes/kubernetes

cd /usr/local/src/
wget https://dl.k8s.io/v1.13.0/kubernetes-server-linux-amd64.tar.gz
tar xf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin/
cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin/

创建kube-apiserver使用的客户端token文件

export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
cat > /opt/kubernetes/cfg/token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

创建kube-apiserver配置文件

[root@k8s-master1 ~]# vim /opt/kubernetes/cfg/kube-apiserver 

KUBE_APISERVER_OPTS="--logtostderr=false 
--v=4 
--log-dir=/opt/kubernetes/log 
--etcd-servers=https://192.168.0.123:2379,https://192.168.0.125:2379,https://192.168.0.126:2379 
--bind-address=0.0.0.0 
--secure-port=6443 
--advertise-address=192.168.0.123 
--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 
--token-auth-file=/opt/kubernetes/cfg/token.csv 
--service-node-port-range=30000-50000 
--tls-cert-file=/opt/kubernetes/ssl/kubernetes.pem  
--tls-private-key-file=/opt/kubernetes/ssl/kubernetes-key.pem 
--client-ca-file=/opt/kubernetes/ssl/ca.pem 
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem 
--etcd-cafile=/opt/kubernetes/ssl/ca.pem 
--etcd-certfile=/opt/kubernetes/ssl/etcd.pem 
--etcd-keyfile=/opt/kubernetes/ssl/etcd-key.pem"

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

创建kube-apiserver系统服务

[root@k8s-master1 ~]# vim /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
RestartSec=5
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

启动apiserver

systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver
systemctl status kube-apiserver

通过url访问api接口

[root@k8s-master1 ~]# curl -L --cacert /opt/kubernetes/ssl/ca.pem  https://192.168.0.123:6443/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.123:6443"
    }
  ]
}
[root@k8s-master1 ~]# curl -L http://127.0.0.1:8080/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.123:6443"
    }
  ]
}

部署Controller Manager

创建配置文件

[root@k8s-master1 ~]# vim /opt/kubernetes/cfg/kube-controller-manager
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false 
--v=4 
--log-dir=/opt/kubernetes/log 
--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 
--experimental-cluster-signing-duration=87600h0m0s"

创建服务文件

[root@k8s-master1 ~]# vim /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
RestartSec=5

[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
systemctl status kube-controller-manager

部署scheduller

创建配置文件

[root@k8s-master1 ~]# vim /opt/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=false 
--v=4 
--log-dir=/opt/kubernetes/log 
--master=127.0.0.1:8080 
--leader-elect"

--master 连接本地apiserver
--leader-elect 当该组件启动多个时，自动选举（HA）

创建服务文件

[root@k8s-master1 ~]# vim /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
RestartSec=5

[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler
systemctl status kube-scheduler

master2部署

将master1的配置复制到master2，修改对应ip启动服务即可

scp -r /opt/kubernetes 192.168.0.124:/opt/
scp /usr/lib/systemd/system/kube-* 192.168.0.124:/usr/lib/systemd/system/

访问master2 API接口

[root@k8s-master2 ~]# curl -L --cacert /opt/kubernetes/ssl/ca.pem  https://192.168.0.124:6443/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.124:6443"
    }
  ]
}
[root@k8s-master2 ~]# curl -L http://127.0.0.1:8080/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.124:6443"
    }
  ]
}

配置apiserver的高可用

安装keepalived

yum -y install keepalived

master1 的keepalived配置文件

[root@k8s-master1 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived 
 
global_defs { 
   # 接收邮件地址 
   notification_email { 
     acassen@firewall.loc 
     failover@firewall.loc 
     sysadmin@firewall.loc 
   } 
   # 邮件发送地址 
   notification_email_from Alexandre.Cassen@firewall.loc  
   smtp_server 127.0.0.1 
   smtp_connect_timeout 30 
   router_id API_MASTER 
} 

vrrp_script check_api {
    script "/etc/keepalived/check_api.sh"
}

vrrp_instance VI_1 { 
    state MASTER 
    interface ens32
    virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 
    priority 100    # 优先级，备服务器设置 90 
    advert_int 1    # 指定VRRP 心跳包通告间隔时间，默认1秒 
    authentication { 
        auth_type PASS      
        auth_pass 1111 
    }  
    virtual_ipaddress { 
        192.168.0.130/24 
    } 
    track_script {
        check_api
    } 
}

master2的keepalived配置文件

[root@k8s-master2 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived 
 
global_defs { 
   # 接收邮件地址 
   notification_email { 
     acassen@firewall.loc 
     failover@firewall.loc 
     sysadmin@firewall.loc 
   } 
   # 邮件发送地址 
   notification_email_from Alexandre.Cassen@firewall.loc  
   smtp_server 127.0.0.1 
   smtp_connect_timeout 30 
   router_id API_MASTER 
} 

vrrp_script check_api {
    script "/etc/keepalived/check_api.sh"
}

vrrp_instance VI_1 { 
    state BACKUP
    interface ens32
    virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 
    priority 90    # 优先级，备服务器设置 90 
    advert_int 1    # 指定VRRP 心跳包通告间隔时间，默认1秒 
    authentication { 
        auth_type PASS      
        auth_pass 1111 
    }  
    virtual_ipaddress { 
        192.168.0.130/24 
    } 
    track_script {
        check_api
    } 
}

准备检查apiserver的脚本

[root@k8s-master1 ~]# vim /etc/keepalived/check_api.sh 
count=$(ps -ef |grep kube-apiserver |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
    systemctl stop keepalived
fi

[root@k8s-master1 ~]# chmod +x /etc/keepalived/check_api.sh

启动keepalived

systemctl start keepalived
systemctl enable keepalived
systemctl status keepalived

高可用测试

查看ip信息

[root@k8s-master1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:8a:2b:5f brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.123/24 brd 192.168.0.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet 192.168.0.130/24 scope global secondary ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe8a:2b5f/64 scope link 
       valid_lft forever preferred_lft forever

[root@k8s-master2 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:77:dc:9c brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.124/24 brd 192.168.0.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe77:dc9c/64 scope link 
       valid_lft forever preferred_lft forever

vip绑定在master1，访问vip

[root@k8s-master1 ~]# curl -L --cacert /opt/kubernetes/ssl/ca.pem  https://192.168.0.130:6443/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.123:6443"
    }
  ]
}

停止master1的apiserver，再次访问vip

[root@k8s-master1 ~]# curl -L --cacert /opt/kubernetes/ssl/ca.pem  https://192.168.0.130:6443/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.124:6443"
    }
  ]
}

查看ip信息，vip绑定在master2

[root@k8s-master1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:8a:2b:5f brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.123/24 brd 192.168.0.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe8a:2b5f/64 scope link 
       valid_lft forever preferred_lft forever

[root@k8s-master2 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:77:dc:9c brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.124/24 brd 192.168.0.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet 192.168.0.130/24 scope global secondary ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe77:dc9c/64 scope link 
       valid_lft forever preferred_lft forever

配置kubectl命令行工具

创建admin证书签名请求

[root@k8s-master1 ssl]# vim admin-csr.json
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}

生成admin证书和密钥

[root@k8s-master1 ssl]# cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem 
   -ca-key=/opt/kubernetes/ssl/ca-key.pem 
   -config=/opt/kubernetes/ssl/ca-config.json 
   -profile=kubernetes admin-csr.json | cfssljson -bare admin

[root@k8s-master1 ssl]# cp admin*.pem /opt/kubernetes/ssl/

设置集群参数

kubectl config set-cluster kubernetes 
  --certificate-authority=/opt/kubernetes/ssl/ca.pem 
  --embed-certs=true 
  --server=https://192.168.0.130:6443

设置客户端认证参数

kubectl config set-credentials admin 
  --client-certificate=/opt/kubernetes/ssl/admin.pem 
  --embed-certs=true 
  --client-key=/opt/kubernetes/ssl/admin-key.pem

设置上下文参数

kubectl config set-context kubernetes 
   --cluster=kubernetes 
   --user=admin

设置默认上下文

kubectl config use-context kubernetes

查看集群信息

[root@k8s-master1 ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-1               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"}