安装文档(1.9参考)


kubernetes 1.9.4

基于 二进制 文件部署 本地化 kube-apiserver, kube-controller-manager , kube-scheduler

环境说明

这里配置单个Master 2个node, Master 既是 Master 也是 Node, node 只做单纯 Node

kubernetes-2: 10.90.26.2   Master
kubernetes-3: 10.90.26.3   Node
kubernetes-4: 10.90.26.4   Node

初始化环境

hostnamectl --static set-hostname hostname

kubernetes-2: 10.90.26.2
kubernetes-3: 10.90.26.3
kubernetes-4: 10.90.26.4
#编辑 /etc/hosts 文件,配置hostname 通信

vi /etc/hosts

kubernetes-2: 10.90.26.2
kubernetes-3: 10.90.26.3
kubernetes-4: 10.90.26.4

创建 验证

这里使用 CloudFlare 的 PKI 工具集 cfssl 来生成 Certificate Authority (CA) 证书和秘钥文件。

安装 cfssl

mkdir -p /opt/local/cfssl

cd /opt/local/cfssl

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
mv cfssl_linux-amd64 cfssl

wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
mv cfssljson_linux-amd64 cfssljson

wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
mv cfssl-certinfo_linux-amd64 cfssl-certinfo

chmod +x *

创建 CA 证书配置

mkdir /opt/ssl

cd /opt/ssl

# config.json 文件

vi  config.json


{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "87600h"
      }
    }
  }
}

# csr.json 文件

vi csr.json

{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

生成 CA 证书和私钥


cd /opt/ssl/

/opt/local/cfssl/cfssl gencert -initca csr.json | /opt/local/cfssl/cfssljson -bare ca


[root@kubernetes-64 ssl]# ls -lt
总用量 20
-rw-r--r-- 1 root root 1005 7月   3 17:26 ca.csr
-rw------- 1 root root 1675 7月   3 17:26 ca-key.pem
-rw-r--r-- 1 root root 1363 7月   3 17:26 ca.pem
-rw-r--r-- 1 root root  210 7月   3 17:24 csr.json
-rw-r--r-- 1 root root  292 7月   3 17:23 config.json

分发证书

# 创建证书目录
mkdir -p /etc/kubernetes/ssl

# 拷贝所有文件到目录下
cp *.pem /etc/kubernetes/ssl
cp ca.csr /etc/kubernetes/ssl

# 这里要将文件拷贝到所有的k8s 机器上

scp *.pem 10.90.26.3:/etc/kubernetes/ssl/
scp *.csr 10.90.26.3:/etc/kubernetes/ssl/

scp *.pem 10.90.26.4:/etc/kubernetes/ssl/
scp *.csr 10.90.26.4:/etc/kubernetes/ssl/

安装 docker

所有服务器预先安装 docker-ce ,官方1.9 中提示, 目前 k8s 支持最高 Docker versions 1.11.2, 1.12.6, 1.13.1, and 17.03.1

# 导入 yum 源

# 安装 yum-config-manager

yum -y install yum-utils

# 导入
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo


# 更新 repo
yum makecache

# 查看yum 版本

yum list docker-ce.x86_64  --showduplicates |sort -r



# 安装指定版本 docker-ce 17.03 被 docker-ce-selinux 依赖, 不能直接yum 安装 docker-ce-selinux

wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm


rpm -ivh docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm


yum -y install docker-ce-17.03.1.ce


# 查看安装

docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   f5ec1e2
 Built:        Tue Jun 27 02:21:36 2017
 OS/Arch:      linux/amd64

更改docker 配置

# 添加配置

vi /etc/systemd/system/docker.service



[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target docker-storage-setup.service
Wants=docker-storage-setup.service

[Service]
Type=notify
Environment=GOTRACEBACK=crash
ExecReload=/bin/kill -s HUP $MAINPID
Delegate=yes
KillMode=process
ExecStart=/usr/bin/dockerd \
          $DOCKER_OPTS \
          $DOCKER_STORAGE_OPTIONS \
          $DOCKER_NETWORK_OPTIONS \
          $DOCKER_DNS_OPTIONS \
          $INSECURE_REGISTRY
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=1min
Restart=on-abnormal

[Install]
WantedBy=multi-user.target

# 重新读取配置,启动 docker 
systemctl daemon-reload
systemctl start docker
systemctl enable docker

# 如果报错 请使用
journalctl -f -t docker  和 journalctl -u docker 来定位问题

etcd 集群

etcd 是k8s集群最重要的组件, etcd 挂了,集群就挂了

安装 etcd

官方地址 https://github.com/coreos/etcd/releases

# 下载 二进制文件

wget https://github.com/coreos/etcd/releases/download/v3.2.14/etcd-v3.2.14-linux-amd64.tar.gz

tar zxvf etcd-v3.2.14-linux-amd64.tar.gz

cd etcd-v3.2.14-linux-amd64

mv etcd  etcdctl /usr/bin/

创建 etcd 证书

etcd 证书这里,默认配置三个,后续如果需要增加,更多的 etcd 节点 这里的认证IP 请多预留几个,以备后续添加能通过认证,不需要重新签发

cd /opt/ssl/

vi etcd-csr.json

{
  "CN": "etcd",
  "hosts": [
    "127.0.0.1",
    "10.90.26.2",
    "10.90.26.3",
    "10.90.26.4"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

# 生成 etcd   密钥

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

# 查看生成

[root@kubernetes-2 ssl]# ls etcd*
etcd.csr  etcd-csr.json  etcd-key.pem  etcd.pem



# 拷贝到etcd服务器

# etcd-1 
cp etcd*.pem /etc/kubernetes/ssl/

# etcd-2
scp etcd*.pem 10.90.26.3:/etc/kubernetes/ssl/

# etcd-3
scp etcd*.pem 10.90.26.4:/etc/kubernetes/ssl/



# 如果 etcd 非 root 用户,读取证书会提示没权限

chmod 644 /etc/kubernetes/ssl/etcd-key.pem

修改 etcd 配置

由于 etcd 是最重要的组件,所以 –data-dir 请配置到其他路径中

# 创建 etcd data 目录, 并授权

useradd etcd

mkdir -p /opt/etcd

chown -R etcd:etcd /opt/etcd


# etcd-1


vi /etc/systemd/system/etcd.service


[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/opt/etcd/
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/usr/bin/etcd \
  --name=etcd1 \
  --cert-file=/etc/kubernetes/ssl/etcd.pem \
  --key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --peer-cert-file=/etc/kubernetes/ssl/etcd.pem \
  --peer-key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --peer-trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --initial-advertise-peer-urls=https://10.90.26.2:2380 \
  --listen-peer-urls=https://10.90.26.2:2380 \
  --listen-client-urls=https://10.90.26.2:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=https://10.90.26.2:2379 \
  --initial-cluster-token=k8s-etcd-cluster \
  --initial-cluster=etcd1=https://10.90.26.2:2380,etcd2=https://10.90.26.3:2380,etcd3=https://10.90.26.4:2380 \
  --initial-cluster-state=new \
  --data-dir=/opt/etcd/
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

# etcd-2


vi /etc/systemd/system/etcd.service


[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/opt/etcd/
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/usr/bin/etcd \
  --name=etcd2 \
  --cert-file=/etc/kubernetes/ssl/etcd.pem \
  --key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --peer-cert-file=/etc/kubernetes/ssl/etcd.pem \
  --peer-key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --peer-trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --initial-advertise-peer-urls=https://10.90.26.3:2380 \
  --listen-peer-urls=https://10.90.26.3:2380 \
  --listen-client-urls=https://10.90.26.3:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=https://10.90.26.3:2379 \
  --initial-cluster-token=k8s-etcd-cluster \
  --initial-cluster=etcd1=https://10.90.26.2:2380,etcd2=https://10.90.26.3:2380,etcd3=https://10.90.26.4:2380 \
  --initial-cluster-state=new \
  --data-dir=/opt/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

# etcd-3


vi /etc/systemd/system/etcd.service


[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/opt/etcd/
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/usr/bin/etcd \
  --name=etcd3 \
  --cert-file=/etc/kubernetes/ssl/etcd.pem \
  --key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --peer-cert-file=/etc/kubernetes/ssl/etcd.pem \
  --peer-key-file=/etc/kubernetes/ssl/etcd-key.pem \
  --trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --peer-trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --initial-advertise-peer-urls=https://10.90.26.4:2380 \
  --listen-peer-urls=https://10.90.26.4:2380 \
  --listen-client-urls=https://10.90.26.4:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=https://10.90.26.4:2379 \
  --initial-cluster-token=k8s-etcd-cluster \
  --initial-cluster=etcd1=https://10.90.26.2:2380,etcd2=https://10.90.26.3:2380,etcd3=https://10.90.26.4:2380 \
  --initial-cluster-state=new \
  --data-dir=/opt/etcd/
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

启动 etcd

分别启动 所有节点的 etcd 服务

systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd
# 如果报错 请使用
journalctl -f -t etcd  和 journalctl -u etcd 来定位问题

验证 etcd 集群状态

查看 etcd 集群状态:

etcdctl --endpoints=https://10.90.26.2:2379,https://10.90.26.3:2379,https://10.90.26.4:2379\
        --cert-file=/etc/kubernetes/ssl/etcd.pem \
        --ca-file=/etc/kubernetes/ssl/ca.pem \
        --key-file=/etc/kubernetes/ssl/etcd-key.pem \
        cluster-health

member 35eefb8e7cc93b53 is healthy: got healthy result from https://10.90.26.2:2379
member 4576ff5ed626a66b is healthy: got healthy result from https://10.90.26.3:2379
member bf3bd651ec832339 is healthy: got healthy result from https://10.90.26.4:2379
cluster is healthy

查看 etcd 集群成员:

etcdctl --endpoints=https://10.90.26.2:2379,https://10.90.26.3:2379,https://10.90.26.4:2379\
        --cert-file=/etc/kubernetes/ssl/etcd.pem \
        --ca-file=/etc/kubernetes/ssl/ca.pem \
        --key-file=/etc/kubernetes/ssl/etcd-key.pem \
        member list


35eefb8e7cc93b53: name=etcd3 peerURLs=https://10.90.26.4:2380 clientURLs=https://10.90.26.4:2379 isLeader=false
4576ff5ed626a66b: name=etcd1 peerURLs=https://10.90.26.2:2380 clientURLs=https://10.90.26.2:2379 isLeader=true
bf3bd651ec832339: name=etcd2 peerURLs=https://10.90.26.3:2380 clientURLs=https://10.90.26.3:2379 isLeader=false

配置 Kubernetes 集群

kubectl 安装在所有需要进行操作的机器上

Master and Node

Master 需要部署 kube-apiserver , kube-scheduler , kube-controller-manager 这三个组件。 kube-scheduler 作用是调度pods分配到那个node里,简单来说就是资源调度。 kube-controller-manager 作用是 对 deployment controller , replication controller, endpoints controller, namespace controller, and serviceaccounts controller等等的循环控制,与kube-apiserver交互。

安装组件

# 从github 上下载版本

cd /tmp

wget https://dl.k8s.io/v1.9.4/kubernetes-server-linux-amd64.tar.gz

tar -xzvf kubernetes-server-linux-amd64.tar.gz

cd kubernetes

cp -r server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl} /usr/local/bin/


scp server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl,kube-proxy,kubelet} 10.90.26.3:/usr/local/bin/


scp server/bin/{kube-proxy,kubelet} 10.90.26.4:/usr/local/bin/

创建 admin 证书

kubectl 与 kube-apiserver 的安全端口通信,需要为安全通信提供 TLS 证书和秘钥。

cd /opt/ssl/

vi 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 证书和私钥
cd /opt/ssl/

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


# 查看生成

[root@kubernetes-2 ssl]# ls admin*
admin.csr  admin-csr.json  admin-key.pem  admin.pem

cp admin*.pem /etc/kubernetes/ssl/


配置 kubectl kubeconfig 文件

生成证书相关的配置文件存储与 /root/.kube 目录中

# 配置 kubernetes 集群

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=https://10.90.26.2:6443


# 配置 客户端认证

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


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


kubectl config use-context kubernetes

创建 kubernetes 证书

cd /opt/ssl

vi kubernetes-csr.json

{
  "CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "10.90.26.2",
    "10.90.26.3",
    "10.90.26.4",
    "10.254.0.1",
    "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"
    }
  ]
}


## 这里 hosts 字段中 三个 IP 分别为 127.0.0.1 本机, 10.90.26.2 和 10.90.26.3 ,多个Master需要写多个。  10.254.0.1 为 kubernetes SVC 的 IP, 一般是 部署网络的第一个IP , 如: 10.254.0.1 , 在启动完成后,我们使用   kubectl get svc , 就可以查看到

生成 kubernetes 证书和私钥

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

# 查看生成

[root@kubernetes-2 ssl]# ls -lt kubernetes*
-rw-r--r-- 1 root root 1261 11月 16 15:12 kubernetes.csr
-rw------- 1 root root 1679 11月 16 15:12 kubernetes-key.pem
-rw-r--r-- 1 root root 1635 11月 16 15:12 kubernetes.pem
-rw-r--r-- 1 root root  475 11月 16 15:12 kubernetes-csr.json


# 拷贝到目录
cp kubernetes*.pem /etc/kubernetes/ssl/


配置 kube-apiserver

kubelet 首次启动时向 kube-apiserver 发送 TLS Bootstrapping 请求,kube-apiserver 验证 kubelet 请求中的 token 是否与它配置的 token 一致,如果一致则自动为 kubelet生成证书和秘钥。

# 生成 token

[root@kubernetes-2 ssl]# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
df3b158fbdc425ae2ac70bbef0688921


# 创建 token.csv 文件

cd /opt/ssl

vi token.csv

df3b158fbdc425ae2ac70bbef0688921,kubelet-bootstrap,10001,"system:kubelet-bootstrap"


# 拷贝

cp token.csv /etc/kubernetes/



# 生成高级审核配置文件

cd /etc/kubernetes


cat >> audit-policy.yaml <<EOF
# Log all requests at the Metadata level.
apiVersion: audit.k8s.io/v1beta1
kind: Policy
rules:
- level: Metadata
EOF


创建 kube-apiserver.service 文件

# 自定义 系统 service 文件一般存于 /etc/systemd/system/ 下
# 配置为 各自的本地 IP

vi /etc/systemd/system/kube-apiserver.service

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
User=root
ExecStart=/usr/local/bin/kube-apiserver \
  --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota,NodeRestriction \
  --advertise-address=10.90.26.4 \
  --allow-privileged=true \
  --apiserver-count=3 \
  --audit-policy-file=/etc/kubernetes/audit-policy.yaml \
  --audit-log-maxage=30 \
  --audit-log-maxbackup=3 \
  --audit-log-maxsize=100 \
  --audit-log-path=/var/log/kubernetes/audit.log \
  --authorization-mode=Node,RBAC \
  --bind-address=0.0.0.0 \
  --secure-port=6443 \
  --client-ca-file=/etc/kubernetes/ssl/ca.pem \
  --enable-swagger-ui=true \
  --etcd-cafile=/etc/kubernetes/ssl/ca.pem \
  --etcd-certfile=/etc/kubernetes/ssl/etcd.pem \
  --etcd-keyfile=/etc/kubernetes/ssl/etcd-key.pem \
  --etcd-servers=https://10.90.26.2:2379,https://10.90.26.3:2379,https://10.90.26.4:2379 \
  --event-ttl=1h \
  --kubelet-https=true \
  --insecure-bind-address=127.0.0.1 \
  --insecure-port=8080 \
  --service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
  --service-cluster-ip-range=10.254.0.0/18 \
  --service-node-port-range=30000-32000 \
  --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  --enable-bootstrap-token-auth \
  --token-auth-file=/etc/kubernetes/token.csv \
  --v=1
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

# k8s 1.8 开始需要 添加 --authorization-mode=Node
# k8s 1.8 开始需要 添加 --admission-control=NodeRestriction
# k8s 1.8 开始需要 添加 --audit-policy-file=/etc/kubernetes/audit-policy.yaml

# 这里面要注意的是 --service-node-port-range=30000-32000
# 这个地方是 映射外部端口时 的端口范围,随机映射也在这个范围内映射,指定映射端口必须也在这个范围内。

启动 kube-apiserver

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

配置 kube-controller-manager

–cluster-signing-cert-file 与 –cluster-signing-key-file 标签将被删除。

# 创建 kube-controller-manager.service 文件

vi /etc/systemd/system/kube-controller-manager.service


[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
  --address=0.0.0.0 \
  --master=http://127.0.0.1:8080 \
  --allocate-node-cidrs=true \
  --service-cluster-ip-range=10.254.0.0/18 \
  --cluster-cidr=10.254.64.0/18 \
  --cluster-name=kubernetes \
  --cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \
  --cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
  --service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem \
  --root-ca-file=/etc/kubernetes/ssl/ca.pem \
  --leader-elect=true \
  --v=1
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target


启动 kube-controller-manager

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

配置 kube-scheduler

# 创建 kube-cheduler.service 文件

vi /etc/systemd/system/kube-scheduler.service


[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
  --address=0.0.0.0 \
  --master=http://127.0.0.1:8080 \
  --leader-elect=true \
  --v=1
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

启动 kube-scheduler

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

验证 Master 节点

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



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


配置 kubelet

kubelet 启动时向 kube-apiserver 发送 TLS bootstrapping 请求,需要先将 bootstrap token 文件中的 kubelet-bootstrap 用户赋予 system:node-bootstrapper 角色,然后 kubelet 才有权限创建认证请求(certificatesigningrequests)。


# 先创建认证请求
# user 为 master 中 token.csv 文件里配置的用户
# 只需创建一次就可以

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

创建 kubelet kubeconfig 文件

# 配置集群

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=https://10.90.26.4:6443 \
  --kubeconfig=bootstrap.kubeconfig

# 配置客户端认证

kubectl config set-credentials kubelet-bootstrap \
  --token=df3b158fbdc425ae2ac70bbef0688921 \
  --kubeconfig=bootstrap.kubeconfig


# 配置关联

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig
  
  
# 配置默认关联
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

# 拷贝生成的 bootstrap.kubeconfig 文件

mv bootstrap.kubeconfig /etc/kubernetes/

scp bootstrapping  10.90.26.3:/etc/kubernetes/

scp bootstrapping  10.90.26.4:/etc/kubernetes/

创建 kubelet.service 文件

# 创建 kubelet 目录

> 配置为 node 本机 IP

mkdir /var/lib/kubelet

vi /etc/systemd/system/kubelet.service


[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/usr/local/bin/kubelet \
  --cgroup-driver=cgroupfs \
  --hostname-override=kubernetes-2 \
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0 \
  --experimental-bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
  --cert-dir=/etc/kubernetes/ssl \
  --cluster_dns=10.254.0.2 \
  --cluster_domain=cluster.local. \
  --hairpin-mode promiscuous-bridge \
  --allow-privileged=true \
  --fail-swap-on=false \
  --serialize-image-pulls=false \
  --logtostderr=true \
  --max-pods=512 \
  --v=1

[Install]
WantedBy=multi-user.target

# 如上配置:
kubernetes-2    本机hostname
10.254.0.2       预分配的 dns 地址
cluster.local.   为 kubernetes 集群的 domain
mirrorgooglecontainers/pause-amd64:3.0  这个是 pod 的基础镜像,既 gcr 的 gcr.io/google_containers/pause-amd64:3.0 镜像, 下载下来修改为自己的仓库中的比较快。

启动 kubelet


systemctl daemon-reload
systemctl enable kubelet
systemctl start kubelet
systemctl status kubelet

# 如果报错 请使用
journalctl -f -t kubelet  和 journalctl -u kubelet 来定位问题

配置 TLS 认证

# 查看 csr 的名称

[root@kubernetes-2 ~]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-Pu4QYp3NAwlC6o8AG8iwdCl52CiqhjiSyrso3335JTs   1m        kubelet-bootstrap   Pending
node-csr-poycCHd7B8YPxc12EBgI3Rwe0wnDJah5uIGvQHzghVY   2m        kubelet-bootstrap   Pending


# 增加 认证

kubectl get csr | grep Pending | awk '{print $1}' | xargs kubectl certificate approve

验证 nodes

[root@kubernetes-2 ~]# kubectl get nodes
NAME            STATUS    ROLES     AGE       VERSION
kubernetes-2   Ready     <none>    12s       v1.9.4
kubernetes   Ready     <none>    17s       v1.9.4


# 成功以后会自动生成配置文件与密钥

# 配置文件

ls /etc/kubernetes/kubelet.kubeconfig   
/etc/kubernetes/kubelet.kubeconfig


# 密钥文件  这里注意如果 csr 被删除了,请删除如下文件,并重启 kubelet 服务

ls /etc/kubernetes/ssl/kubelet*
/etc/kubernetes/ssl/kubelet-client.crt  /etc/kubernetes/ssl/kubelet.crt
/etc/kubernetes/ssl/kubelet-client.key  /etc/kubernetes/ssl/kubelet.key

配置 kube-proxy

创建 kube-proxy 证书

# 证书方面由于我们node端没有装 cfssl
# 我们回到 master 端 机器 去配置证书,然后拷贝过来

[root@kubernetes-2 ~]# cd /opt/ssl


vi kube-proxy-csr.json

{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

生成 kube-proxy 证书和私钥

/opt/local/cfssl/cfssl gencert -ca=/etc/kubernetes/ssl/ca.pem \
  -ca-key=/etc/kubernetes/ssl/ca-key.pem \
  -config=/opt/ssl/config.json \
  -profile=kubernetes  kube-proxy-csr.json | /opt/local/cfssl/cfssljson -bare kube-proxy
  
# 查看生成
ls kube-proxy*
kube-proxy.csr  kube-proxy-csr.json  kube-proxy-key.pem  kube-proxy.pem

# 拷贝到目录

cp kube-proxy* /etc/kubernetes/ssl/

scp kube-proxy* 10.90.26.3:/etc/kubernetes/ssl/

scp kube-proxy* 10.90.26.4:/etc/kubernetes/ssl/

创建 kube-proxy kubeconfig 文件

# 配置集群

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=https://10.90.26.2:6443 \
  --kubeconfig=kube-proxy.kubeconfig


# 配置客户端认证

kubectl config set-credentials kube-proxy \
  --client-certificate=/etc/kubernetes/ssl/kube-proxy.pem \
  --client-key=/etc/kubernetes/ssl/kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig
  
  
# 配置关联

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



# 配置默认关联
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

# 拷贝到需要的 node 端里

scp kube-proxy.kubeconfig 10.90.26.3:/etc/kubernetes/

scp kube-proxy.kubeconfig 10.90.26.4:/etc/kubernetes/

创建 kube-proxy.service 文件

# 创建 kube-proxy 目录

mkdir -p /var/lib/kube-proxy


vi /etc/systemd/system/kube-proxy.service

[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
  --bind-address=10.90.26.2 \
  --hostname-override=kubernetes-2 \
  --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig \
  --logtostderr=true \
  --v=1
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

启动 kube-proxy


systemctl daemon-reload
systemctl enable kube-proxy
systemctl start kube-proxy
systemctl status kube-proxy

# 如果报错 请使用
journalctl -f -t kube-proxy  和 journalctl -u kube-proxy 来定位问题

至此 Master 端 与 Master and Node 端的安装完毕,正式使用还需要继续下一步,安装网络插件,才能部署应用。

node 节点配置参考master节点,只需配置kubelet,kube-proxy服务。

后续操作

安装cni插件: 到CNI 插件最新release页面下载cni-v0.6.0.tgz,解压后里面有很多插件,选择如下几个复制到项目 bin目录下

flannel用到的插件 bridge flannel host-local loopback portmap

修改kubelet配置,添加cni条目:

[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/root/local/bin/kubelet \
  --address=192.168.112.156 \
  --cgroup-driver=systemd \
  --hostname-override=192.168.112.156 \
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0 \
  --experimental-bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
  --cert-dir=/etc/kubernetes/ssl \
  --cluster_dns=10.254.0.2 \
  --network-plugin=cni \
  --cni-conf-dir=/etc/cni/net.d \
  --cni-bin-dir=/usr/local/bin \
  --cluster_domain=cluster.local. \
  --hairpin-mode promiscuous-bridge \
  --allow-privileged=true \
  --fail-swap-on=false \
  --serialize-image-pulls=false \
  --logtostderr=true \
  --max-pods=512 \
  --v=3

[Install]
WantedBy=multi-user.target

重启kubelet,此时查看node状态,可能会显示notready,因为没有cni配置文件

 mkdir -p /etc/cni/net.d/
 vim  mkdir -p /etc/cni/net.d/cni-default.conf
 {
        "name": "mynet",
        "type": "bridge",
        "bridge": "mynet0",
        "isDefaultGateway": true,
        "ipMasq": true,
        "hairpinMode": true,
        "ipam": {
                "type": "host-local",
                "subnet": "10.254.0.0/18"
        
}
}

然后重启kubelet,查看kubelet状态,变为ready。

安装网络插件

  • 安装网络插件(flannel,calico) damenset方式运行
https://github.com/coreos/flannel/tree/master/Documentation/k8s-manifests
#修改net-conf.json配置。
#需要给docker配置代理才能拉取镜像。

安装kube-dns插件

官方yaml文件

安装dashboard插件

官方yaml文件

高可用方案

  • keepalived+haproxy 该方式需要使用vip实现,实际工作的apiserver只有一个,只需在master节点安装keepalived和haproxy,并配置代理即可。所有node配置连接api的地址为:虚拟ip:6443 使用这种方式需要将上面kubelet,kube-proxy的kubeconfig中apiserver改成https://vip:6443
  • nginx反向代理 使用nginx的反向代理方式实现,master节点不需要特除配置,直接安装n个master节点即可,在每一个node节点安装一个nginx,版本需要1.9以上,并启用stream模块,支持tcp的反向代理,所有node连接api:127.0.0.1:6443。 使用这种方式需要将上面kubelet,kube-proxy的kubeconfig中apiserver改成https://127.0.0.1:6443

本文链接:参与评论 »

--EOF--

提醒:本文最后更新于 566 天前,文中所描述的信息可能已发生改变,请谨慎使用。

专题「KUBERNETES」的其它文章 »

Comments