CentOS7 使用二进制部署 Kubernetes 1.15集群

1、安装环境准备：

部署节点说明

IP地址	主机名	CPU	内存	磁盘
192.168.1.108	qas-k8s-master01	2	2G	30G
192.168.1.165	qas-k8s-node01	2	2G	30G
192.168.1.215	qas-k8s-node02	2	2G	30G

2.下载1.15的包

地址：https://kubernetes.io/docs/setup/release/notes/

或者下载百度网盘的：链接提取码：op7d

2.1 下载tar.gz包到服务器并解压到master节点的root目录下

[root@qas-k8s-master01 bin]# pwd
/root/kubernetes/server/bin
[root@qas-k8s-master01 bin]# ll
total 1570456
-rwxr-xr-x 1 root root  42793600 Apr  9 01:51 apiextensions-apiserver
-rwxr-xr-x 1 root root 100402880 Apr  9 01:51 cloud-controller-manager
-rw-r--r-- 1 root root         8 Apr  9 01:47 cloud-controller-manager.docker_tag
-rw-r--r-- 1 root root 144294400 Apr  9 01:47 cloud-controller-manager.tar
-rwxr-xr-x 1 root root 211183808 Apr  9 01:51 hyperkube
-rwxr-xr-x 1 root root  39587104 Apr  9 01:51 kubeadm
-rwxr-xr-x 1 root root 167554400 Apr  9 01:51 kube-apiserver
-rw-r--r-- 1 root root         8 Apr  9 01:47 kube-apiserver.docker_tag
-rw-r--r-- 1 root root 211445760 Apr  9 01:47 kube-apiserver.tar
-rwxr-xr-x 1 root root 115579424 Apr  9 01:51 kube-controller-manager
-rw-r--r-- 1 root root         8 Apr  9 01:47 kube-controller-manager.docker_tag
-rw-r--r-- 1 root root 159471104 Apr  9 01:47 kube-controller-manager.tar
-rwxr-xr-x 1 root root  43115328 Apr  9 01:51 kubectl
-rwxr-xr-x 1 root root 127940544 Apr  9 01:51 kubelet
-rwxr-xr-x 1 root root  36685440 Apr  9 01:51 kube-proxy
-rw-r--r-- 1 root root         8 Apr  9 01:47 kube-proxy.docker_tag
-rw-r--r-- 1 root root  83982848 Apr  9 01:47 kube-proxy.tar
-rwxr-xr-x 1 root root  39258304 Apr  9 01:51 kube-scheduler
-rw-r--r-- 1 root root         8 Apr  9 01:47 kube-scheduler.docker_tag
-rw-r--r-- 1 root root  83149824 Apr  9 01:47 kube-scheduler.tar
-rwxr-xr-x 1 root root   1648224 Apr  9 01:51 mounter
[root@qas-k8s-master01 bin]#

二、Kubernetes 安装及配置

1、初始化环境

1.1、设置关闭防火墙及SELINUX

systemctl stop firewalld && systemctl disable firewalld
setenforce 0
vi /etc/selinux/config
SELINUX=disabled

1.2、关闭Swap

swapoff -a && sysctl -w vm.swappiness=0
vi /etc/fstab
#UUID=7bff6243-324c-4587-b550-55dc34018ebf swap                    swap    defaults        0 0

1.3、设置Docker所需参数

cat << EOF | tee /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf

报错提示不存在的话安装这个模块

modprobe br_netfilter

1.4、安装 Docker

wget  https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
mv docker-ce.repo  /etc/yum.repos.d/
yum install docker-ce -y
systemctl start docker && systemctl enable docker

1.5、创建安装目录

mkdir /k8s/etcd/{bin,cfg,ssl} -p
mkdir /k8s/kubernetes/{bin,cfg,ssl} -p

1.6、安装及配置CFSSL

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

1.7、创建认证证书

创建 ETCD 证书

cat << EOF | tee ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

创建 ETCD CA 配置文件

cat << EOF | tee ca-csr.json
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Shenzhen",
            "ST": "Shenzhen"
        }
    ]
}
EOF

创建 ETCD Server 证书

cat << EOF | tee server-csr.json
{
    "CN": "etcd",
    "hosts": [
    "10.0.0.1",
    "192.168.1.108",
    "192.168.1.165",
    "192.168.1.215"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Shenzhen",
            "ST": "Shenzhen"
        }
    ]
}
EOF

生成 ETCD CA 证书和私钥

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

创建 Kubernetes CA 证书

cat << EOF | tee ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat << EOF | tee ca-csr.json
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Shenzhen",
            "ST": "Shenzhen",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

生成证书

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

生成API_SERVER证书

cat << EOF | tee server-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "192.168.1.108",
      "192.168.1.165",
      "192.168.1.215",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Shenzhen",
            "ST": "Shenzhen",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

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

创建 Kubernetes Proxy 证书

cat << EOF | tee kube-proxy-csr.json
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "Shenzhen",
      "ST": "Shenzhen",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

1.8、 ssh-key认证

# ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:FQjjiRDp8IKGT+UDM+GbQLBzF3DqDJ+pKnMIcHGyO/o root@qas-k8s-master01
The key's randomart image is:
+---[RSA 2048]----+
|o.==o o. ..      |
|ooB+o+ o.  .     |
|B++@o o   .      |
|=X**o    .       |
|o=O. .  S        |
|..+              |
|oo .             |
|* .              |
|o+E              |
+----[SHA256]-----+

# ssh-copy-id 192.168.1.165
# ssh-copy-id 192.168.1.215

2 、部署ETCD

安装包地址：

解压安装文件

tar -xvf etcd-v3.3.10-linux-amd64.tar.gz
cd etcd-v3.3.10-linux-amd64/
cp etcd etcdctl /k8s/etcd/bin/

设置etcd的配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.108:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.108:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.108:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.108:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.108:2380,etcd02=https://192.168.1.165:2380,etcd03=https://192.168.1.215:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
[root@qas-k8s-master01 ssl]#

创建 etcd的 systemd unit 文件

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

[Service]
Type=notify
EnvironmentFile=/k8s/etcd/cfg/etcd
ExecStart=/k8s/etcd/bin/etcd \
--name=${ETCD_NAME} \
--data-dir=${ETCD_DATA_DIR} \
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=/k8s/etcd/ssl/server.pem \
--key-file=/k8s/etcd/ssl/server-key.pem \
--peer-cert-file=/k8s/etcd/ssl/server.pem \
--peer-key-file=/k8s/etcd/ssl/server-key.pem \
--trusted-ca-file=/k8s/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/k8s/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

拷贝证书文件

cp ca*pem server*pem /k8s/etcd/ssl

启动ETCD服务

systemctl daemon-reload
systemctl enable etcd
systemctl start etcd

查看etcd状态

[root@qas-k8s-master01 ssl]# systemctl status etcd
● etcd.service - Etcd Server
   Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 15:55:58 CST; 1h 12min ago
 Main PID: 29830 (etcd)
    Tasks: 12
   Memory: 66.7M
   CGroup: /system.slice/etcd.service
           └─29830 /k8s/etcd/bin/etcd --name=etcd01 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.1.10...

Jul 09 17:07:39 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.340843978s ...SAGE")
Jul 09 17:07:39 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.343013157s ...SHOT")
Jul 09 17:08:04 qas-k8s-master01 etcd[29830]: the clock difference against peer 67ad1178efd89256 is too high [1.287315582s ...SHOT")
Jul 09 17:08:04 qas-k8s-master01 etcd[29830]: the clock difference against peer 67ad1178efd89256 is too high [1.285244104s ...SAGE")
Jul 09 17:08:09 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.340602239s ...SAGE")
Jul 09 17:08:09 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.342891162s ...SHOT")
Jul 09 17:08:34 qas-k8s-master01 etcd[29830]: the clock difference against peer 67ad1178efd89256 is too high [1.285259365s ...SAGE")
Jul 09 17:08:34 qas-k8s-master01 etcd[29830]: the clock difference against peer 67ad1178efd89256 is too high [1.287337806s ...SHOT")
Jul 09 17:08:39 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.342999378s ...SHOT")
Jul 09 17:08:39 qas-k8s-master01 etcd[29830]: the clock difference against peer 2369b1ebd5f356e7 is too high [1.339802949s ...SAGE")
Hint: Some lines were ellipsized, use -l to show in full.
[root@qas-k8s-master01 ssl]#

将启动文件、配置文件拷贝到节点1、节点2

cd /k8s/ 
scp -r etcd 192.168.1.165:/k8s/
scp -r etcd 192.168.1.215:/k8s/
scp /usr/lib/systemd/system/etcd.service  192.168.1.165:/usr/lib/systemd/system/etcd.service
scp /usr/lib/systemd/system/etcd.service  192.168.1.215:/usr/lib/systemd/system/etcd.service

node01节点修改

[root@qas-k8s-node01 cfg]# cat /k8s/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd02"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.165:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.165:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.165:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.165:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.108:2380,etcd02=https://192.168.1.165:2380,etcd03=https://192.168.1.215:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
[root@qas-k8s-node01 cfg]#

node02节点修改

[root@qas-k8s-node02 bin]# cat /k8s/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd03"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.215:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.215:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.215:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.215:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.108:2380,etcd02=https://192.168.1.165:2380,etcd03=https://192.168.1.215:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
[root@qas-k8s-node02 bin]#

验证集群是否正常运行

./etcdctl \
--ca-file=/k8s/etcd/ssl/ca.pem \
--cert-file=/k8s/etcd/ssl/server.pem \
--key-file=/k8s/etcd/ssl/server-key.pem \
--endpoints="https://192.168.1.108,\
https://192.168.1.165:2379,\
https://192.168.1.215:2379" cluster-health

注意：
启动ETCD集群同时启动二个节点，启动一个节点集群是无法正常启动的；

返回以下表示ok

member 5db3ea816863435 is healthy: got healthy result from https://192.168.1.108:2379
member 991b5845cecb31b is healthy: got healthy result from https://192.168.1.165:2379
member c67ee2780d64a0d4 is healthy: got healthy result from https://192.168.1.215:2379
cluster is healthy

3、部署Flannel网络

向 etcd 写入集群 Pod 网段信息

cd /k8s/etcd/ssl/
/k8s/etcd/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem \
--key-file=server-key.pem \
--endpoints="https://192.168.1.108:2379,\
https://192.168.1.165:2379,https://192.168.1.215:2379" \
set /coreos.com/network/config  '{ "Network": "172.18.0.0/16", "Backend": {"Type": "vxlan"}}'

flanneld 当前版本 (v0.10.0) 不支持 etcd v3，故使用 etcd v2 API 写入配置 key 和网段数据；
写入的 Pod 网段 ${CLUSTER_CIDR} 必须是 /16 段地址，必须与 kube-controller-manager 的 –cluster-cidr 参数值一致；

解压安装

tar -xvf flannel-v0.10.0-linux-amd64.tar.gz
mv flanneld mk-docker-opts.sh /k8s/kubernetes/bin/

配置Flannel

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.1.108:2379,https://192.168.1.165:2379,https://192.168.1.215:2379 -etcd-cafile=/k8s/etcd/ssl/ca.pem -etcd-certfile=/k8s/etcd/ssl/server.pem -etcd-keyfile=/k8s/etcd/ssl/server-key.pem"
[root@qas-k8s-master01 ssl]#

创建 flanneld 的 systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/k8s/kubernetes/cfg/flanneld
ExecStart=/k8s/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/k8s/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

mk-docker-opts.sh 脚本将分配给 flanneld 的 Pod 子网网段信息写入 /run/flannel/docker 文件，后续 docker 启动时使用这个文件中的环境变量配置 docker0 网桥；
flanneld 使用系统缺省路由所在的接口与其它节点通信，对于有多个网络接口（如内网和公网）的节点，可以用 -iface 参数指定通信接口，如上面的 eth0 接口;
flanneld 运行时需要 root 权限；

配置Docker启动指定子网段

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/docker.service 
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
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
[root@qas-k8s-master01 ssl]#

将flanneld systemd unit 文件到所有节点

cd /k8s/
scp -r kubernetes 192.168.1.165:/k8s/
scp -r kubernetes 192.168.1.215:/k8s/
scp /k8s/kubernetes/cfg/flanneld 192.168.1.165:/k8s/kubernetes/cfg/flanneld
scp /k8s/kubernetes/cfg/flanneld 192.168.1.215:/k8s/kubernetes/cfg/flanneld
scp /usr/lib/systemd/system/docker.service  192.168.1.165:/usr/lib/systemd/system/docker.service 
scp /usr/lib/systemd/system/docker.service  192.168.1.215:/usr/lib/systemd/system/docker.service
scp /usr/lib/systemd/system/flanneld.service  192.168.1.165:/usr/lib/systemd/system/flanneld.service 
scp /usr/lib/systemd/system/flanneld.service  192.168.1.215:/usr/lib/systemd/system/flanneld.service

启动服务

systemctl daemon-reload
systemctl start flanneld
systemctl enable flanneld
systemctl restart docker

查看node01服务

[root@qas-k8s-node01 cfg]# systemctl status flanneld
● flanneld.service - Flanneld overlay address etcd agent
   Loaded: loaded (/usr/lib/systemd/system/flanneld.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 14:51:52 +08; 2h 4min ago
 Main PID: 2191 (flanneld)
    Tasks: 10
   Memory: 14.8M
   CGroup: /system.slice/flanneld.service
           └─2191 /k8s/kubernetes/bin/flanneld --ip-masq --etcd-endpoints=https://192.168.1.108:2379,https://192.168.1.165:2379,h...

Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.577551    2191 iptables.go:167] Deleting iptables rule: ! -s ...RETURN
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.578182    2191 iptables.go:167] Deleting iptables rule: ! -s ...UERADE
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.578982    2191 iptables.go:167] Deleting iptables rule: -d 17...ACCEPT
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.579680    2191 iptables.go:155] Adding iptables rule: -s 172....ACCEPT
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.580578    2191 iptables.go:155] Adding iptables rule: -s 172....RETURN
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.582778    2191 iptables.go:155] Adding iptables rule: -s 172....UERADE
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.583542    2191 iptables.go:155] Adding iptables rule: -d 172....ACCEPT
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.584722    2191 iptables.go:155] Adding iptables rule: ! -s 17...RETURN
Jul 09 14:51:52 qas-k8s-node01 flanneld[2191]: I0709 14:51:52.587207    2191 iptables.go:155] Adding iptables rule: ! -s 17...UERADE
Jul 09 14:51:52 qas-k8s-node01 systemd[1]: Started Flanneld overlay address etcd agent.
Hint: Some lines were ellipsized, use -l to show in full.
[root@qas-k8s-node01 cfg]#

查看node02服务

[root@qas-k8s-node02 bin]# systemctl status flanneld
● flanneld.service - Flanneld overlay address etcd agent
   Loaded: loaded (/usr/lib/systemd/system/flanneld.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 14:51:57 CST; 2h 5min ago
 Main PID: 12986 (flanneld)
    Tasks: 11
   Memory: 10.2M
   CGroup: /system.slice/flanneld.service
           └─12986 /k8s/kubernetes/bin/flanneld --ip-masq --etcd-endpoints=https://192.168.1.108:2379,https://192...

Jul 09 14:51:56 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.992347   12986 iptables.go:167] Deleting iptab...CEPT
Jul 09 14:51:56 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.992940   12986 iptables.go:155] Adding iptable...TURN
Jul 09 14:51:56 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.994247   12986 iptables.go:155] Adding iptable...RADE
Jul 09 14:51:56 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.995163   12986 iptables.go:167] Deleting iptab...CEPT
Jul 09 14:51:56 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.995931   12986 main.go:429] Waiting for 22h59m...ease
Jul 09 14:51:57 qas-k8s-node02 flanneld[12986]: I0709 14:51:56.999655   12986 iptables.go:155] Adding iptable...TURN
Jul 09 14:51:57 qas-k8s-node02 flanneld[12986]: I0709 14:51:57.000668   12986 iptables.go:155] Adding iptable...CEPT
Jul 09 14:51:57 qas-k8s-node02 flanneld[12986]: I0709 14:51:57.004930   12986 iptables.go:155] Adding iptable...RADE
Jul 09 14:51:57 qas-k8s-node02 flanneld[12986]: I0709 14:51:57.005116   12986 iptables.go:155] Adding iptable...CEPT
Jul 09 14:51:57 qas-k8s-node02 systemd[1]: Started Flanneld overlay address etcd agent.
Hint: Some lines were ellipsized, use -l to show in full.

查看是否生效

[root@qas-k8s-node02 bin]# ip add
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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:a0:69:83 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.215/24 brd 192.168.1.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::1fd3:aade:96a5:e5b4/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:68:7c:ef:e8 brd ff:ff:ff:ff:ff:ff
    inet 172.18.88.1/24 brd 172.18.88.255 scope global docker0
       valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether ee:7c:89:a4:9e:20 brd ff:ff:ff:ff:ff:ff
    inet 172.18.88.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
    inet6 fe80::ec7c:89ff:fea4:9e20/64 scope link 
       valid_lft forever preferred_lft forever
[root@qas-k8s-node02 bin]#

4、部署 master 节点

kubernetes master 节点运行如下组件：

kube-apiserver
kube-scheduler
kube-controller-manager
kube-scheduler 和 kube-controller-manager 可以以集群模式运行，通过 leader 选举产生一个工作进程，其它进程处于阻塞模式。

将二进制文件解压拷贝到master 节点

tar -xvf kubernetes-server-linux-amd64.tar.gz 
cd kubernetes/server/bin/
cp kube-scheduler kube-apiserver kube-controller-manager kubectl /k8s/kubernetes/bin/

拷贝认证

cp *pem /k8s/kubernetes/ssl/

部署 kube-apiserver 组件

创建 TLS Bootstrapping Token

# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
2366a641f656a0a025abb4aabda4511b

vim /k8s/kubernetes/cfg/token.csv
2366a641f656a0a025abb4aabda4511b,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

创建apiserver配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.1.108:2379,https://192.168.1.165:2379,https://192.168.1.215:2379 \
--bind-address=192.168.1.108 \
--secure-port=6443 \
--advertise-address=192.168.1.108 \
--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=/k8s/kubernetes/cfg/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/k8s/kubernetes/ssl/server.pem  \
--tls-private-key-file=/k8s/kubernetes/ssl/server-key.pem \
--client-ca-file=/k8s/kubernetes/ssl/ca.pem \
--service-account-key-file=/k8s/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/k8s/etcd/ssl/ca.pem \
--etcd-certfile=/k8s/etcd/ssl/server.pem \
--etcd-keyfile=/k8s/etcd/ssl/server-key.pem"
[root@qas-k8s-master01 ssl]#

创建 kube-apiserver systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-apiserver
ExecStart=/k8s/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

启动服务

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

查看apiserver是否运行

[root@qas-k8s-master01 ssl]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
   Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 15:56:17 CST; 1h 5min ago
     Docs: https://github.com/kubernetes/kubernetes
 Main PID: 29887 (kube-apiserver)
    Tasks: 11
   Memory: 294.0M
   CGroup: /system.slice/kube-apiserver.service
           └─29887 /k8s/kubernetes/bin/kube-apiserver --logtostderr=true --v=4 --etcd-servers=https://192.168.1.108:2379,https://...

Jul 09 17:01:24 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:24.393003   29887 wrap.go:47] GET /api/v1/namespaces/def...6070]
Jul 09 17:01:24 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:24.429849   29887 wrap.go:47] GET /api/v1/namespaces/kub...0182]
Jul 09 17:01:24 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:24.433622   29887 wrap.go:47] PUT /api/v1/namespaces/kub...0182]
Jul 09 17:01:25 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:25.392111   29887 wrap.go:47] GET /api/v1/namespaces/kub...1694]
Jul 09 17:01:25 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:25.399618   29887 wrap.go:47] PUT /api/v1/namespaces/kub...1694]
Jul 09 17:01:26 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:26.270688   29887 wrap.go:47] GET /apis/coordination.k8s...3914]
Jul 09 17:01:26 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:26.275799   29887 wrap.go:47] PUT /apis/coordination.k8s...3914]
Jul 09 17:01:26 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:26.283494   29887 wrap.go:47] GET /api/v1/nodes: (2.0970...0182]
Jul 09 17:01:26 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:26.461482   29887 wrap.go:47] GET /api/v1/namespaces/kub...0182]
Jul 09 17:01:26 qas-k8s-master01 kube-apiserver[29887]: I0709 17:01:26.466095   29887 wrap.go:47] PUT /api/v1/namespaces/kub...0182]
Hint: Some lines were ellipsized, use -l to show in full.
[root@qas-k8s-master01 ssl]#

部署kube-scheduler

创建kube-scheduler配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect"
[root@qas-k8s-master01 ssl]#

创建kube-scheduler systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-scheduler
ExecStart=/k8s/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

启动服务

systemctl daemon-reload
systemctl enable kube-scheduler.service 
systemctl restart kube-scheduler.service

查看kube-scheduler是否运行

[root@qas-k8s-master01 ssl]# systemctl status kube-scheduler.service
● kube-scheduler.service - Kubernetes Scheduler
   Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 15:56:35 CST; 1h 7min ago
     Docs: https://github.com/kubernetes/kubernetes
 Main PID: 29993 (kube-scheduler)
    Tasks: 10
   Memory: 43.1M
   CGroup: /system.slice/kube-scheduler.service
           └─29993 /k8s/kubernetes/bin/kube-scheduler --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect

Jul 09 16:56:04 qas-k8s-master01 kube-scheduler[29993]: I0709 16:56:04.018734   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 16:56:39 qas-k8s-master01 kube-scheduler[29993]: I0709 16:56:39.010296   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 16:58:58 qas-k8s-master01 kube-scheduler[29993]: I0709 16:58:58.041986   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 16:59:43 qas-k8s-master01 kube-scheduler[29993]: I0709 16:59:43.994356   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 17:00:24 qas-k8s-master01 kube-scheduler[29993]: I0709 17:00:24.022221   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 17:00:26 qas-k8s-master01 kube-scheduler[29993]: I0709 17:00:26.001668   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 17:00:45 qas-k8s-master01 kube-scheduler[29993]: I0709 17:00:45.012870   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 17:02:49 qas-k8s-master01 kube-scheduler[29993]: I0709 17:02:49.017949   29993 reflector.go:385] k8s.io/client-go/inf...eived
Jul 09 17:03:00 qas-k8s-master01 kube-scheduler[29993]: I0709 17:03:00.021114   29993 reflector.go:385] k8s.io/kubernetes/cm...eived
Jul 09 17:03:20 qas-k8s-master01 kube-scheduler[29993]: I0709 17:03:20.002870   29993 reflector.go:385] k8s.io/client-go/inf...eived
Hint: Some lines were ellipsized, use -l to show in full.
[root@qas-k8s-master01 ssl]#

部署kube-controller-manager

创建kube-controller-manager配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/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=/k8s/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/k8s/kubernetes/ssl/ca-key.pem  \
--root-ca-file=/k8s/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/k8s/kubernetes/ssl/ca-key.pem"
[root@qas-k8s-master01 ssl]#

创建kube-controller-manager systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-controller-manager
ExecStart=/k8s/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

启动服务

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

查看kube-controller-manager是否运行

[root@qas-k8s-master01 ssl]# systemctl status kube-controller-manager
● kube-controller-manager.service - Kubernetes Controller Manager
   Loaded: loaded (/usr/lib/systemd/system/kube-controller-manager.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 15:56:45 CST; 1h 8min ago
     Docs: https://github.com/kubernetes/kubernetes
 Main PID: 30021 (kube-controller)
    Tasks: 9
   Memory: 132.4M
   CGroup: /system.slice/kube-controller-manager.service
           └─30021 /k8s/kubernetes/bin/kube-controller-manager --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect=tr...

Jul 09 17:05:04 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:04.041136   30021 request.go:530] Throttling req...=32s
Jul 09 17:05:04 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:04.085887   30021 request.go:530] Throttling req...=32s
Jul 09 17:05:04 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:04.961864   30021 reflector.go:243] k8s.io/clien...sync
Jul 09 17:05:05 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:05.038589   30021 reflector.go:243] k8s.io/clien...sync
Jul 09 17:05:05 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:05.421412   30021 reflector.go:243] k8s.io/clien...sync
Jul 09 17:05:05 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:05.564957   30021 pv_controller_base.go:419] res...ller
Jul 09 17:05:06 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:06.380376   30021 gc_controller.go:144] GC'ing orphaned
Jul 09 17:05:06 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:06.383448   30021 gc_controller.go:173] GC'ing u...ing.
Jul 09 17:05:07 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:07.419696   30021 cronjob_controller.go:128] Fou...jobs
Jul 09 17:05:07 qas-k8s-master01 kube-controller-manager[30021]: I0709 17:05:07.419707   30021 cronjob_controller.go:134] Fou...oups
Hint: Some lines were ellipsized, use -l to show in full.
[root@qas-k8s-master01 ssl]#

将可执行文件路/k8s/kubernetes/ 添加到 PATH 变量中

vim /etc/profile
PATH=/k8s/kubernetes/bin:$PATH:$HOME/bin
source /etc/profile

查看master集群状态

[root@qas-k8s-master01 ssl]# kubectl get cs,nodes
NAME                                 STATUS    MESSAGE             ERROR
componentstatus/controller-manager   Healthy   ok                  
componentstatus/scheduler            Healthy   ok                  
componentstatus/etcd-2               Healthy   {"health":"true"}   
componentstatus/etcd-1               Healthy   {"health":"true"}   
componentstatus/etcd-0               Healthy   {"health":"true"}   

[root@qas-k8s-master01 ssl]#

5、部署node 节点

kubernetes work 节点运行如下组件：

docker 前面已经部署
kubelet
kube-proxy

部署 kubelet 组件

kublet 运行在每个 worker 节点上，接收 kube-apiserver 发送的请求，管理 Pod 容器，执行交互式命令，如exec、run、logs 等;
kublet 启动时自动向 kube-apiserver 注册节点信息，内置的 cadvisor 统计和监控节点的资源使用情况;
为确保安全，本文档只开启接收 https 请求的安全端口，对请求进行认证和授权，拒绝未授权的访问(如apiserver、heapster)。

将kubelet 二进制文件拷贝node节点

cp kubelet kube-proxy /k8s/kubernetes/bin/
scp kubelet kube-proxy 192.168.1.165:/k8s/kubernetes/bin/
scp kubelet kube-proxy 192.168.1.215:/k8s/kubernetes/bin/

创建 kubelet bootstrap kubeconfig 文件

此脚本在/k8s/kubernetes/ssl下创建

vim  environment.sh
# 创建kubelet bootstrapping kubeconfig 
BOOTSTRAP_TOKEN=2366a641f656a0a025abb4aabda4511b
KUBE_APISERVER="https://192.168.1.108:6443"
# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=./ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \
  --token=${BOOTSTRAP_TOKEN} \
  --kubeconfig=bootstrap.kubeconfig

# 设置上下文参数
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig

# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

#----------------------

# 创建kube-proxy kubeconfig文件

kubectl config set-cluster kubernetes \
  --certificate-authority=./ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy \
  --client-certificate=./kube-proxy.pem \
  --client-key=./kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

运行脚本

[root@qas-k8s-master01 ssl]# pwd
/k8s/kubernetes/ssl
[root@qas-k8s-master01 ssl]# ./environment.sh

将bootstrap kubeconfig kube-proxy.kubeconfig 文件拷贝到所有 nodes节点

cp bootstrap.kubeconfig kube-proxy.kubeconfig /k8s/kubernetes/cfg/
scp bootstrap.kubeconfig kube-proxy.kubeconfig 192.168.1.165:/k8s/kubernetes/cfg/
scp bootstrap.kubeconfig kube-proxy.kubeconfig 192.168.1.215:/k8s/kubernetes/cfg/

创建kubelet 参数配置文件拷贝到所有 nodes节点

创建 kubelet 参数配置模板文件：

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.1.108
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["10.0.0.2"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
  anonymous:
    enabled: true
[root@qas-k8s-master01 ssl]#

创建kubelet配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.1.108 \
--kubeconfig=/k8s/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/k8s/kubernetes/cfg/bootstrap.kubeconfig \
--config=/k8s/kubernetes/cfg/kubelet.config \
--cert-dir=/k8s/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
[root@qas-k8s-master01 ssl]#

创建kubelet systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/k8s/kubernetes/cfg/kubelet
ExecStart=/k8s/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

将kubelet-bootstrap用户绑定到系统集群角色

kubectl create clusterrolebinding kubelet-bootstrap \
  --clusterrole=system:node-bootstrapper \
  --user=kubelet-bootstrap

启动服务

systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet

approve kubelet CSR 请求

可以手动或自动 approve CSR 请求。推荐使用自动的方式，因为从 v1.8 版本开始，可以自动轮转approve csr 后生成的证书。
手动 approve CSR 请求
查看 CSR 列表：

# kubectl get csr
NAME                                                   AGE    REQUESTOR           CONDITION
node-csr-An1VRgJ7FEMMF_uyy6iPjyF5ahuLx6tJMbk2SMthwLs   39m    kubelet-bootstrap   Pending
node-csr-dWPIyP_vD1w5gBS4iTZ6V5SJwbrdMx05YyybmbW3U5s   5m5s   kubelet-bootstrap   Pending

# kubectl certificate approve node-csr-An1VRgJ7FEMMF_uyy6iPjyF5ahuLx6tJMbk2SMthwLs
certificatesigningrequest.certificates.k8s.io/node-csr-An1VRgJ7FEMMF_uyy6iPjyF5ahuLx6tJMbk2SMthwLs 

# kubectl certificate approve node-csr-dWPIyP_vD1w5gBS4iTZ6V5SJwbrdMx05YyybmbW3U5s  
certificatesigningrequest.certificates.k8s.io/node-csr-dWPIyP_vD1w5gBS4iTZ6V5SJwbrdMx05YyybmbW3U5s approved

# kubectl get csr
NAME                                                   AGE     REQUESTOR           CONDITION
node-csr-An1VRgJ7FEMMF_uyy6iPjyF5ahuLx6tJMbk2SMthwLs   41m     kubelet-bootstrap   Approved,Issued
node-csr-dWPIyP_vD1w5gBS4iTZ6V5SJwbrdMx05YyybmbW3U5s   7m32s   kubelet-bootstrap   Approved,Issued

Requesting User：请求 CSR 的用户，kube-apiserver 对它进行认证和授权；
Subject：请求签名的证书信息；
证书的 CN 是 system:node:kube-node2， Organization 是 system:nodes，kube-apiserver 的 Node 授权模式会授予该证书的相关权限；

查看集群状态

[root@qas-k8s-master01 bin]# kubectl get nodes
NAME            STATUS   ROLES    AGE   VERSION
192.168.1.108   Ready    master   68m   v1.15.0
192.168.1.165   Ready    node     68m   v1.15.0
192.168.1.215   Ready    node     68m   v1.15.0
[root@qas-k8s-master01 bin]#

部署 kube-proxy 组件

kube-proxy 运行在所有 node节点上，它监听 apiserver 中 service 和 Endpoint 的变化情况，创建路由规则来进行服务负载均衡。

创建 kube-proxy 配置文件

[root@qas-k8s-master01 ssl]# cat /k8s/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.1.108 \
--cluster-cidr=10.0.0.0/24 \
--kubeconfig=/k8s/kubernetes/cfg/kube-proxy.kubeconfig"
[root@qas-k8s-master01 ssl]#

bindAddress: 监听地址；
clientConnection.kubeconfig: 连接 apiserver 的 kubeconfig 文件；
clusterCIDR: kube-proxy 根据 –cluster-cidr 判断集群内部和外部流量，指定 –cluster-cidr 或 –masquerade-all 选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT；
hostnameOverride: 参数值必须与 kubelet 的值一致，否则 kube-proxy 启动后会找不到该 Node，从而不会创建任何 ipvs 规则；
mode: 使用 ipvs 模式；

创建kube-proxy systemd unit 文件

[root@qas-k8s-master01 ssl]# cat /usr/lib/systemd/system/kube-proxy.service 
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-proxy
ExecStart=/k8s/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@qas-k8s-master01 ssl]#

启动服务

systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy

查看 kube-proxy状态

[root@qas-k8s-master01 ssl]# systemctl status kube-proxy
● kube-proxy.service - Kubernetes Proxy
   Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-07-09 15:56:51 CST; 55min ago
 Main PID: 30062 (kube-proxy)
    Tasks: 0
   Memory: 43.0M
   CGroup: /system.slice/kube-proxy.service
           ‣ 30062 /k8s/kubernetes/bin/kube-proxy --logtostderr=true --v=4 --hostname-override=192.168.1.108 --cluster-cidr=10.0....

Jul 09 16:51:58 qas-k8s-master01 kube-proxy[30062]: I0709 16:51:58.710766   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:51:59 qas-k8s-master01 kube-proxy[30062]: I0709 16:51:59.594996   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:00 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:00.717813   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:01 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:01.608540   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:02 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:02.734118   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:03 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:03.629360   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:04 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:04.742294   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:05 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:05.636544   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:06 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:06.752374   30062 config.go:132] Calling handler.OnEndpointsUpdate
Jul 09 16:52:07 qas-k8s-master01 kube-proxy[30062]: I0709 16:52:07.646475   30062 config.go:132] Calling handler.OnEndpointsUpdate
[root@qas-k8s-master01 ssl]#

集群状态

打node 或者master 节点的标签

kubectl label node 192.168.1.108  node-role.kubernetes.io/master='master'
kubectl label node 192.168.1.165  node-role.kubernetes.io/node='node'
kubectl label node 192.168.1.215  node-role.kubernetes.io/node='node'

[root@qas-k8s-master01 bin]# kubectl get node,cs
NAME                 STATUS   ROLES    AGE   VERSION
node/192.168.1.108   Ready    master   69m   v1.15.0
node/192.168.1.165   Ready    node     70m   v1.15.0
node/192.168.1.215   Ready    node     69m   v1.15.0

NAME                                 STATUS    MESSAGE             ERROR
componentstatus/scheduler            Healthy   ok                  
componentstatus/controller-manager   Healthy   ok                  
componentstatus/etcd-0               Healthy   {"health":"true"}   
componentstatus/etcd-2               Healthy   {"health":"true"}   
componentstatus/etcd-1               Healthy   {"health":"true"}   
[root@qas-k8s-master01 bin]#

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