Kubernetes集羣的詳細部署

時間 2019-11-09

原文原文鏈接

1、集羣機器

linux-node1：192.168.56.11     ---master
部署的服務：
etcd
kube-apiserver
kube-controller-manager
kube-scheduler
docker

linux-node2：192.168.56.12      ---node
部署的服務：
etcd
kubelet
kube-proxy
docker

linux-node3：192.168.56.13      ---node
部署的服務：
etcd
kubelet
kube-proxy
docker

2、環境準備

一、設置主機名

hostnamectl set-hostname linux-node1
hostnamectl set-hostname linux-node2
hostnamectl set-hostname linux-node3
----------
二、設置部署節點到其它全部節點的SSH免密碼登(包括本機)

[root@linux-node1 ~]# ssh-keygen -t rsa
[root@linux-node1 ~]# ssh-copy-id linux-node1
[root@linux-node1 ~]# ssh-copy-id linux-node2
[root@linux-node1 ~]# ssh-copy-id linux-node3
----------
三、綁定主機host

cat > /etc/hosts <<EOF
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.56.11 linux-node1
192.168.56.12 linux-node2
192.168.56.13 linux-node3
EOF
----------
四、關閉防火牆和selinux

systemctl disable firewalld
systemctl stop firewalld

#關閉selinux
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux
sed -i "s/SELINUXTYPE=targeted/SELINUXTYPE=disabled/g" /etc/sysconfig/selinux
----------
五、其餘配置

yum install -y ntpdate wget lrzsz vim net-tools

#加入crontab
1 * * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1

#vim  /etc/profile   高亮顯示
export PS1="\[\e]0;\a\]\n\[\e[1;32m\]\[\e[1;33m\]\H\[\e[1;35m\]<\$(date +\"%Y-%m-%d %T\")> \[\e[32m\]\w\[\e[0m\]\n\u>\\$ "

#設置時區
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

#SSH登陸慢
sed -i "s/#UseDNS yes/UseDNS no/"  /etc/ssh/sshd_config
sed -i "s/GSSAPIAuthentication yes/GSSAPIAuthentication no/"  /etc/ssh/sshd_config
systemctl restart sshd.service

3、正式安裝

1.安裝Docker(三臺機器都要操做)

第一步：使用國內Docker源

cd /etc/yum.repos.d/
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

第二步：Docker安裝

yum install -y docker-ce

第三步：啓動後臺進程

[root@linux-node2 ~]# systemctl start docker
[root@linux-node2 ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

2.安裝k8s

1.準備部署目錄
   
[root@linux-node1 ~]# mkdir -p /opt/kubernetes/{cfg,bin,ssl,log}

#添加環境變量
[root@linux-node1 ~]# echo "PATH=$PATH:/opt/kubernetes/bin" >> /etc/profile
[root@linux-node1 ~]# source /etc/profile
或者
[root@linux-node1 ~]# vim .bash_profile
PATH=$PATH:$HOME/bin:/opt/kubernetes/bin
[root@linux-node1 ~]# source .bash_profile

2.準備軟件包

#github下載連接

https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.10.md#server-binaries

wget https://storage.googleapis.com/kubernetes-release/release/v1.10.8/kubernetes-server-linux-amd64.tar.gz

wget https://storage.googleapis.com/kubernetes-release/release/v1.10.8/kubernetes-client-linux-amd64.tar.gz

wget https://storage.googleapis.com/kubernetes-release/release/v1.10.8/kubernetes-node-linux-amd64.tar.gz

wget https://storage.googleapis.com/kubernetes-release/release/v1.10.8/kubernetes.tar.gz

3.解壓軟件包

tar -zxvf kubernetes.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-server-linux-amd64.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-client-linux-amd64.tar.gz -C /usr/local/src/
tar -zxvf kubernetes-node-linux-amd64.tar.gz -C /usr/local/src/

3.手動製做CA證書（只在master上進行便可）

1.安裝 CFSSL

[root@linux-node1 ~]# cd /usr/local/src
[root@linux-node1 src]# wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
[root@linux-node1 src]# wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
[root@linux-node1 src]# wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
[root@linux-node1 src]# chmod +x cfssl*
[root@linux-node1 src]# mv cfssl-certinfo_linux-amd64 /opt/kubernetes/bin/cfssl-certinfo
[root@linux-node1 src]# mv cfssljson_linux-amd64  /opt/kubernetes/bin/cfssljson
[root@linux-node1 src]# mv cfssl_linux-amd64  /opt/kubernetes/bin/cfssl

#複製cfssl命令文件到k8s-node1和k8s-node2節點。若是實際中多個節點，就都須要同步複製。

[root@linux-node1 ~]# scp /opt/kubernetes/bin/cfssl* 192.168.56.12:/opt/kubernetes/bin
[root@linux-node1 ~]# scp /opt/kubernetes/bin/cfssl* 192.168.56.13:/opt/kubernetes/bin

2.初始化cfssl

[root@linux-node1 src]# mkdir ssl && cd ssl
[root@linux-node1 ssl]# cfssl print-defaults config > config.json   --生成ca-config.json的樣例(可省略)
[root@linux-node1 ssl]# cfssl print-defaults csr > csr.json  --生成ca-csr.json的樣例(可省略)

3.建立用來生成 CA 文件的 JSON 配置文件
[root@linux-node1 ssl]#
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
[root@linux-node1 ssl]#

4.建立用來生成 CA 證書籤名請求（CSR）的 JSON 配置文件

[root@linux-node1 ssl]# 
cat > ca-csr.json <<EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

5.生成CA證書（ca.pem）和密鑰（ca-key.pem）

[root@ linux-node1 ssl]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#執行上面的命令後，會生成下面三個文件
ca.csr  ca-key.pem  ca.pem

[root@ linux-node1 ssl]# ls -l ca*
-rw-r--r-- 1 root root  290 Mar  4 13:45 ca-config.json
-rw-r--r-- 1 root root 1001 Mar  4 14:09 ca.csr
-rw-r--r-- 1 root root  208 Mar  4 13:51 ca-csr.json
-rw------- 1 root root 1679 Mar  4 14:09 ca-key.pem
-rw-r--r-- 1 root root 1359 Mar  4 14:09 ca.pem

6.分發證書

[root@linux-node1 ssl]# cp ca.csr ca.pem ca-key.pem ca-config.json /opt/kubernetes/ssl
#SCP證書到k8s-node1和k8s-node2節點
[root@linux-node1 ssl]# scp ca.csr ca.pem ca-key.pem ca-config.json 192.168.56.12:/opt/kubernetes/ssl
[root@linux-node1 ssl]# scp ca.csr ca.pem ca-key.pem ca-config.json 192.168.56.13:/opt/kubernetes/ssl

4.手動部署ETCD集羣

0.準備etcd軟件包

wget https://github.com/coreos/etcd/releases/download/v3.2.18/etcd-v3.2.18-linux-amd64.tar.gz

[root@linux-node1 src]# tar zxf etcd-v3.2.18-linux-amd64.tar.gz
[root@linux-node1 src]# cd etcd-v3.2.18-linux-amd64
[root@linux-node1 etcd-v3.2.18-linux-amd64]# cp etcd etcdctl /opt/kubernetes/bin/ 
[root@linux-node1 etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 192.168.56.13:/opt/kubernetes/bin/

1.建立 etcd 證書籤名請求：

[root@linux-node1]# cd /usr/local/src/ssl

cat > etcd-csr.json <<EOF
{
  "CN": "etcd",
  "hosts": [
    "127.0.0.1",
    "192.168.56.11",
    "192.168.56.12",
    "192.168.56.13"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

2.生成 etcd 證書和私鑰：

[root@linux-node1 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 etcd-csr.json | cfssljson -bare etcd

會生成如下證書文件
[root@k8s-master ~]# ls -l etcd*
-rw-r--r-- 1 root root 1045 Mar  5 11:27 etcd.csr
-rw-r--r-- 1 root root  257 Mar  5 11:25 etcd-csr.json
-rw------- 1 root root 1679 Mar  5 11:27 etcd-key.pem
-rw-r--r-- 1 root root 1419 Mar  5 11:27 etcd.pem

3.將證書移動到/opt/kubernetes/ssl目錄下

[root@k8s-master ~]# cp etcd*.pem /opt/kubernetes/ssl
[root@linux-node1 ~]# scp etcd*.pem 192.168.56.12:/opt/kubernetes/ssl
[root@linux-node1 ~]# scp etcd*.pem 192.168.56.13:/opt/kubernetes/ssl
[root@k8s-master ~]# rm -f etcd.csr etcd-csr.json

4.設置ETCD配置文件

[root@linux-node1 ~]# vim /opt/kubernetes/cfg/etcd.conf
#[member]
ETCD_NAME="etcd-node1"
ETCD_DATA_DIR="/var/lib/etcd"
#ETCD_SNAPSHOT_COUNTER="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="https://192.168.56.11:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.56.11:2379,https://127.0.0.1:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.11:2380"
# if you use different ETCD_NAME (e.g. test),
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.56.11:2380,etcd-node2=https://192.168.56.12:2380,etcd-node3=https://192.168.56.13:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.11:2379"
#[security]
CLIENT_CERT_AUTH="true"
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"
PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"

5.建立ETCD系統服務

[root@linux-node1 ~]# vim /etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target

[Service]
Type=simple
WorkingDirectory=/var/lib/etcd
EnvironmentFile=-/opt/kubernetes/cfg/etcd.conf
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /opt/kubernetes/bin/etcd"
Type=notify

[Install]
WantedBy=multi-user.target

6.將文件同步到其餘節點（並修改差別的地方）
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.12:/etc/systemd/system/
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.13:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.13:/etc/systemd/system/

#node2的etcd.conf配置

[root@linux-node2 ~]# vim /opt/kubernetes/cfg/etcd.conf
#[member]
ETCD_NAME="etcd-node2"
ETCD_DATA_DIR="/var/lib/etcd"
#ETCD_SNAPSHOT_COUNTER="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="https://192.168.56.12:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.56.12:2379,https://127.0.0.1:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.12:2380"
# if you use different ETCD_NAME (e.g. test),
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.56.11:2380,etcd-node2=https://192.168.56.12:2380,etcd-node3=https://192.168.56.13:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.12:2379"
#[security]
CLIENT_CERT_AUTH="true"
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"
PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"

#node3的etcd.conf配置
[root@linux-node3 ~]# vim /opt/kubernetes/cfg/etcd.conf
#[member]
ETCD_NAME="etcd-node3"
ETCD_DATA_DIR="/var/lib/etcd"
#ETCD_SNAPSHOT_COUNTER="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="https://192.168.56.13:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.56.13:2379,https://127.0.0.1:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.13:2380"
# if you use different ETCD_NAME (e.g. test),
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.56.11:2380,etcd-node2=https://192.168.56.12:2380,etcd-node3=https://192.168.56.13:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.13:2379"
#[security]
CLIENT_CERT_AUTH="true"
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"
PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem"
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem"
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem"

在全部節點上建立etcd存儲目錄並啓動etcd
[root@linux-node1 ~]# mkdir /var/lib/etcd
[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 ~]# systemctl enable etcd
[root@linux-node1 ~]# systemctl restart etcd
[root@linux-node1 ~]# systemctl status etcd

以上須要你們在全部的 etcd 節點重複上面的步驟，直到全部機器的 etcd 服務都已啓動。

7.驗證集羣

[root@linux-node1 ~]# etcdctl --endpoints=https://192.168.56.11:2379 \
  --ca-file=/opt/kubernetes/ssl/ca.pem \
  --cert-file=/opt/kubernetes/ssl/etcd.pem \
  --key-file=/opt/kubernetes/ssl/etcd-key.pem cluster-health
member 435fb0a8da627a4c is healthy: got healthy result from https://192.168.56.12:2379
member 6566e06d7343e1bb is healthy: got healthy result from https://192.168.56.11:2379
member ce7b884e428b6c8c is healthy: got healthy result from https://192.168.56.13:2379
cluster is healthy

5.Master節點部署

部署Kubernetes API服務部署node

0.準備軟件包

[root@linux-node1 ~]# cd /usr/local/src/kubernetes
[root@linux-node1 kubernetes]# cp server/bin/kube-apiserver /opt/kubernetes/bin/
[root@linux-node1 kubernetes]# cp server/bin/kube-controller-manager /opt/kubernetes/bin/
[root@linux-node1 kubernetes]# cp server/bin/kube-scheduler /opt/kubernetes/bin/

1.建立生成CSR的 JSON 配置文件
[root@linux-node1 ~]# cd /usr/local/src/ssl
[root@linux-node1 src]# vim kubernetes-csr.json
cat > kubernetes-csr.json <<EOF
{
  "CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "192.168.56.11",
    "10.1.0.1",
    "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"
    }
  ]
}
EOF

2.生成 kubernetes 證書和私鑰

 [root@linux-node1 src]# 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

#執行上面的命令，會生成以下兩個文件
kubernetes-key.pem   kubernetes.pem

[root@linux-node1 src]# cp kubernetes*.pem /opt/kubernetes/ssl/
[root@linux-node1 ~]# scp kubernetes*.pem 192.168.56.12:/opt/kubernetes/ssl/
[root@linux-node1 ~]# scp kubernetes*.pem 192.168.56.13:/opt/kubernetes/ssl/

3.建立 kube-apiserver 使用的客戶端 token 文件

[root@linux-node1 ~]#  head -c 16 /dev/urandom | od -An -t x | tr -d ' '
ad6d5bb607a186796d8861557df0d17f 
[root@linux-node1 ~]# vim /opt/kubernetes/ssl/bootstrap-token.csv
ad6d5bb607a186796d8861557df0d17f,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

4.建立基礎用戶名/密碼認證配置

[root@linux-node1 ~]# vim /opt/kubernetes/ssl/basic-auth.csv
admin,admin,1
readonly,readonly,2

5.部署Kubernetes API Server

[root@linux-node1 ~]# vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
ExecStart=/opt/kubernetes/bin/kube-apiserver \
  --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota,NodeRestriction \
  --bind-address=192.168.56.11 \
  --insecure-bind-address=127.0.0.1 \
  --authorization-mode=Node,RBAC \
  --runtime-config=rbac.authorization.k8s.io/v1 \
  --kubelet-https=true \
  --anonymous-auth=false \
  --basic-auth-file=/opt/kubernetes/ssl/basic-auth.csv \
  --enable-bootstrap-token-auth \
  --token-auth-file=/opt/kubernetes/ssl/bootstrap-token.csv \
  --service-cluster-ip-range=10.1.0.0/16 \
  --service-node-port-range=20000-40000 \
  --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/kubernetes.pem \
  --etcd-keyfile=/opt/kubernetes/ssl/kubernetes-key.pem \
  --etcd-servers=https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379 \
  --enable-swagger-ui=true \
  --allow-privileged=true \
  --audit-log-maxage=30 \
  --audit-log-maxbackup=3 \
  --audit-log-maxsize=100 \
  --audit-log-path=/opt/kubernetes/log/api-audit.log \
  --event-ttl=1h \
  --v=2 \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/log
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

6.啓動API Server服務

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 ~]# systemctl enable kube-apiserver
[root@linux-node1 ~]# systemctl start kube-apiserver

查看API Server服務狀態

[root@linux-node1 ~]# systemctl status kube-apiserver

部署Controller Manager服務linux

[root@linux-node1 ~]# vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/opt/kubernetes/bin/kube-controller-manager \
  --address=127.0.0.1 \
  --master=http://127.0.0.1:8080 \
  --allocate-node-cidrs=true \
  --service-cluster-ip-range=10.1.0.0/16 \
  --cluster-cidr=10.2.0.0/16 \
  --cluster-name=kubernetes \
  --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \
  --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \
  --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \
  --root-ca-file=/opt/kubernetes/ssl/ca.pem \
  --leader-elect=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/log

Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

3.啓動Controller Manager

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 scripts]# systemctl enable kube-controller-manager
[root@linux-node1 scripts]# systemctl start kube-controller-manager

4.查看服務狀態

[root@linux-node1 scripts]# systemctl status kube-controller-manager

部署Kubernetes Schedulergit

[root@linux-node1 ~]# vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/opt/kubernetes/bin/kube-scheduler \
  --address=127.0.0.1 \
  --master=http://127.0.0.1:8080 \
  --leader-elect=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/log

Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

2.部署服務

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 scripts]# systemctl enable kube-scheduler
[root@linux-node1 scripts]# systemctl start kube-scheduler
[root@linux-node1 scripts]# systemctl status kube-scheduler

部署kubectl 命令行工具github

1.準備二進制命令包

[root@linux-node1 ~]# cd /usr/local/src/kubernetes/client/bin
[root@linux-node1 bin]# cp kubectl /opt/kubernetes/bin/
#須要將kubectl複製到node節點
[root@linux-node1 bin]# scp /opt/kubernetes/bin/kubectl linux-node2:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp /opt/kubernetes/bin/kubectl linux-node3:/opt/kubernetes/bin/

2.建立 admin 證書籤名請求

[root@linux-node1 ~]# cd /usr/local/src/ssl/
[root@linux-node1 ssl]# 
cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

3.生成 admin 證書和私鑰：

[root@linux-node1 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@linux-node1 ssl]# ls -l admin*
-rw-r--r-- 1 root root 1009 Mar  5 12:29 admin.csr
-rw-r--r-- 1 root root  229 Mar  5 12:28 admin-csr.json
-rw------- 1 root root 1675 Mar  5 12:29 admin-key.pem
-rw-r--r-- 1 root root 1399 Mar  5 12:29 admin.pem

[root@linux-node1 src]# mv admin*.pem /opt/kubernetes/ssl/

4.設置集羣參數

[root@linux-node1 src]# kubectl config set-cluster kubernetes \
   --certificate-authority=/opt/kubernetes/ssl/ca.pem \
   --embed-certs=true \
   --server=https://192.168.56.11:6443
Cluster "kubernetes" set.

5.設置客戶端認證參數

[root@linux-node1 src]# kubectl config set-credentials admin \
   --client-certificate=/opt/kubernetes/ssl/admin.pem \
   --embed-certs=true \
   --client-key=/opt/kubernetes/ssl/admin-key.pem
User "admin" set.

6.設置上下文參數

[root@linux-node1 src]# kubectl config set-context kubernetes \
   --cluster=kubernetes \
   --user=admin
Context "kubernetes" created.

7.設置默認上下文

[root@linux-node1 src]# kubectl config use-context kubernetes
Switched to context "kubernetes".

8.使用kubectl工具

[root@linux-node1 ~]# 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"}

6.Node節點部署

部署kubeletdocker

1.二進制包準備 將軟件包從linux-node1複製到linux-node2中去。

[root@linux-node1 ~]# cd /usr/local/src/kubernetes/server/bin/
[root@linux-node1 bin]# cp kubelet kube-proxy /opt/kubernetes/bin/
[root@linux-node1 bin]# scp kubelet kube-proxy 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp kubelet kube-proxy 192.168.56.13:/opt/kubernetes/bin/

2.建立角色綁定

[root@linux-node1 ~]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding "kubelet-bootstrap" created

3.建立 kubelet bootstrapping kubeconfig 文件 設置集羣參數

[root@linux-node1 ~]# kubectl config set-cluster kubernetes \
   --certificate-authority=/opt/kubernetes/ssl/ca.pem \
   --embed-certs=true \
   --server=https://192.168.56.11:6443 \
   --kubeconfig=bootstrap.kubeconfig
Cluster "kubernetes" set.

設置客戶端認證參數

[root@linux-node1 ~]# kubectl config set-credentials kubelet-bootstrap \
   --token=ad6d5bb607a186796d8861557df0d17f \
   --kubeconfig=bootstrap.kubeconfig   
User "kubelet-bootstrap" set.

設置上下文參數

[root@linux-node1 ~]# kubectl config set-context default \
   --cluster=kubernetes \
   --user=kubelet-bootstrap \
   --kubeconfig=bootstrap.kubeconfig
Context "default" created.

選擇默認上下文

[root@linux-node1 ~]# kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
Switched to context "default".
[root@linux-node1 kubernetes]# cp bootstrap.kubeconfig /opt/kubernetes/cfg
[root@linux-node1 kubernetes]# scp bootstrap.kubeconfig 192.168.56.12:/opt/kubernetes/cfg
[root@linux-node1 kubernetes]# scp bootstrap.kubeconfig 192.168.56.13:/opt/kubernetes/cfg

在node節點上操做,部署kubelet 1.設置CNI支持

[root@linux-node2 ~]# mkdir -p /etc/cni/net.d
[root@linux-node2 ~]# vim /etc/cni/net.d/10-default.conf
cat > /etc/cni/net.d/10-default.conf <<EOF
{
        "name": "flannel",
        "type": "flannel",
        "delegate": {
            "bridge": "docker0",
            "isDefaultGateway": true,
            "mtu": 1400
        }
}
EOF


2.建立kubelet目錄

[root@linux-node2 ~]# mkdir /var/lib/kubelet

3.建立kubelet服務配置

[root@k8s-node2 ~]# vim /usr/lib/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=/opt/kubernetes/bin/kubelet \
  --address=192.168.56.12 \
  --hostname-override=192.168.56.12 \
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0 \
  --experimental-bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
  --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
  --cert-dir=/opt/kubernetes/ssl \
  --network-plugin=cni \
  --cni-conf-dir=/etc/cni/net.d \
  --cni-bin-dir=/opt/kubernetes/bin/cni \
  --cluster-dns=10.1.0.2 \
  --cluster-domain=cluster.local. \
  --hairpin-mode hairpin-veth \
  --allow-privileged=true \
  --fail-swap-on=false \
  --logtostderr=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/log

Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

4.啓動Kubelet

[root@linux-node2 ~]# systemctl daemon-reload
[root@linux-node2 ~]# systemctl enable kubelet
[root@linux-node2 ~]# systemctl start kubelet

5.查看服務狀態

[root@linux-node2 kubernetes]# systemctl status kubelet

6.查看csr請求 注意是在linux-node1上執行。

[root@linux-node1 ~]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-0_w5F1FM_la_SeGiu3Y5xELRpYUjjT2icIFk9gO9KOU   1m        kubelet-bootstrap   Pending

7.批准kubelet 的 TLS 證書請求

[root@linux-node1 ~]# kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve
成功後是Approved的狀態
[root@linux-node1 bin]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-IPMSFbKvwgq2icOeIo2v_WA-qb8QCyA7MT5h4eDmjxg   2m        kubelet-bootstrap   Approved,Issued

執行完畢後，查看節點狀態已是Ready的狀態了 
[root@linux-node1 ~]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    2m        v1.10.8

部署Kubernetes Proxyjson

1.配置kube-proxy使用LVS

[root@linux-node2 ~]# yum install -y ipvsadm ipset conntrack

2.建立 kube-proxy 證書請求

[root@linux-node1 ~]# cd /usr/local/src/ssl/
[root@linux-node1 ~]# vim kube-proxy-csr.json
cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

3.生成證書

[root@linux-node1~]# 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  kube-proxy-csr.json | cfssljson -bare kube-proxy

4.分發證書到全部Node節點

[root@linux-node1 ssl]# cp kube-proxy*.pem /opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp kube-proxy*.pem linux-node2:/opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp kube-proxy*.pem linux-node3:/opt/kubernetes/ssl/

5.建立kube-proxy配置文件

[root@linux-node1 ~]# kubectl config set-cluster kubernetes \
   --certificate-authority=/opt/kubernetes/ssl/ca.pem \
   --embed-certs=true \
   --server=https://192.168.56.11:6443 \
   --kubeconfig=kube-proxy.kubeconfig
Cluster "kubernetes" set.

[root@linux-node1 ~]# kubectl config set-credentials kube-proxy \
   --client-certificate=/opt/kubernetes/ssl/kube-proxy.pem \
   --client-key=/opt/kubernetes/ssl/kube-proxy-key.pem \
   --embed-certs=true \
   --kubeconfig=kube-proxy.kubeconfig
User "kube-proxy" set.

[root@linux-node1 ~]# kubectl config set-context default \
   --cluster=kubernetes \
   --user=kube-proxy \
   --kubeconfig=kube-proxy.kubeconfig
Context "default" created.

[root@linux-node1 ~]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
Switched to context "default".

6.分發kubeconfig配置文件

[root@linux-node1 ssl]# cp kube-proxy.kubeconfig /opt/kubernetes/cfg/
[root@linux-node1 ~]# scp kube-proxy.kubeconfig 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp kube-proxy.kubeconfig 192.168.56.13:/opt/kubernetes/cfg/

7.建立kube-proxy服務配置

[root@linux-node2 bin]# mkdir /var/lib/kube-proxy

[root@k8s-node2 ~]# vim /usr/lib/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=/opt/kubernetes/bin/kube-proxy \
  --bind-address=192.168.56.12 \
  --hostname-override=192.168.56.12 \
  --kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig \
--masquerade-all \
  --feature-gates=SupportIPVSProxyMode=true \
  --proxy-mode=ipvs \
  --ipvs-min-sync-period=5s \
  --ipvs-sync-period=5s \
  --ipvs-scheduler=rr \
  --logtostderr=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/opt/kubernetes/log

Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

8.啓動Kubernetes Proxy
[root@linux-node2 ~]# systemctl daemon-reload
[root@linux-node2 ~]# systemctl enable kube-proxy
[root@linux-node2 ~]# systemctl start kube-proxy

9.查看服務狀態 查看kube-proxy服務狀態

[root@linux-node2 scripts]# systemctl status kube-proxy

檢查LVS狀態
[root@linux-node2 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.1.0.1:443 rr persistent 10800
  -> 192.168.56.11:6443           Masq    1      0          0         

若是你在兩臺實驗機器都安裝了kubelet和proxy服務，使用下面的命令能夠檢查狀態：

[root@linux-node1 ssl]#  kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    22m       v1.10.1
192.168.56.13   Ready     <none>    3m        v1.10.1

linux-node3節點請自行部署。

7.Flannel部署

1.爲Flannel生成證書

[root@linux-node1 ~]# vim flanneld-csr.json
cat > flanneld-csr.json <<EOF
{
  "CN": "flanneld",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

2.生成證書

[root@linux-node1 ~]# 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 flanneld-csr.json | cfssljson -bare flanneld

3.分發證書

[root@linux-node1 ~]# cp flanneld*.pem /opt/kubernetes/ssl/
[root@linux-node1 ~]# scp flanneld*.pem 192.168.56.12:/opt/kubernetes/ssl/
[root@linux-node1 ~]# scp flanneld*.pem 192.168.56.13:/opt/kubernetes/ssl/

4.下載Flannel軟件包

[root@linux-node1 ~]# cd /usr/local/src
wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
[root@linux-node1 src]# tar zxf flannel-v0.10.0-linux-amd64.tar.gz
[root@linux-node1 src]# cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/

複製到linux-node2節點
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.13:/opt/kubernetes/bin/

複製對應腳本到/opt/kubernetes/bin目錄下。
[root@linux-node1 ~]# cd /usr/local/src/kubernetes/cluster/centos/node/bin/
[root@linux-node1 bin]# cp remove-docker0.sh /opt/kubernetes/bin/
[root@linux-node1 bin]# scp remove-docker0.sh 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp remove-docker0.sh 192.168.56.13:/opt/kubernetes/bin/

5.配置Flannel

[root@linux-node1 ~]# vim /opt/kubernetes/cfg/flannel
FLANNEL_ETCD="-etcd-endpoints=https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379"
FLANNEL_ETCD_KEY="-etcd-prefix=/kubernetes/network"
FLANNEL_ETCD_CAFILE="--etcd-cafile=/opt/kubernetes/ssl/ca.pem"
FLANNEL_ETCD_CERTFILE="--etcd-certfile=/opt/kubernetes/ssl/flanneld.pem"
FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/opt/kubernetes/ssl/flanneld-key.pem"

複製配置到其它節點上
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.13:/opt/kubernetes/cfg/

6.設置Flannel系統服務

[root@linux-node1 ~]# vim /usr/lib/systemd/system/flannel.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
Before=docker.service

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/flannel
ExecStartPre=/opt/kubernetes/bin/remove-docker0.sh
ExecStart=/opt/kubernetes/bin/flanneld ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE}
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -d /run/flannel/docker

Type=notify

[Install]
WantedBy=multi-user.target
RequiredBy=docker.service

複製系統服務腳本到其它節點上
scp /usr/lib/systemd/system/flannel.service 192.168.56.12:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/flannel.service 192.168.56.13:/usr/lib/systemd/system/

Flannel CNI集成

下載CNI插件
[root@linux-node1 ~]# cd /usr/local/src
https://github.com/containernetworking/plugins/releases
wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz

[root@linux-node1 ~]# mkdir /opt/kubernetes/bin/cni -p
[root@linux-node1 src]# tar zxf cni-plugins-amd64-v0.7.1.tgz -C /opt/kubernetes/bin/cni
scp -r /opt/kubernetes/bin/cni 192.168.56.12:/opt/kubernetes/bin/cni/
scp -r /opt/kubernetes/bin/cni 192.168.56.13:/opt/kubernetes/bin/cni/

建立Etcd的key

/opt/kubernetes/bin/etcdctl --ca-file /opt/kubernetes/ssl/ca.pem \
    --cert-file /opt/kubernetes/ssl/flanneld.pem \
    --key-file /opt/kubernetes/ssl/flanneld-key.pem \
    --no-sync -C https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379 \
    mk /kubernetes/network/config '{ "Network": "10.2.0.0/16", "Backend": { "Type": "vxlan", "VNI": 1 }}'

啓動flannel

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 ~]# systemctl enable flannel
[root@linux-node1 ~]# chmod +x /opt/kubernetes/bin/*
[root@linux-node1 ~]# systemctl start flannel

查看服務狀態

[root@linux-node1 ~]# systemctl status flannel

配置Docker使用Flannel

[root@linux-node1 ~]# vim /usr/lib/systemd/system/docker.service
[Unit] #在Unit下面修改After和增長Requires
After=network-online.target flannel.service
Wants=network-online.target
Requires=flannel.service

[Service] #增長EnvironmentFile=-/run/flannel/docker
Type=notify
EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPTS

最終配置
cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target flannel.service
Requires=flannel.service

[Service]
Type=notify
EnvironmentFile=-/run/flannel/docker
EnvironmentFile=-/opt/kubernetes/cfg/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPT_BIP $DOCKER_OPT_MTU $DOCKER_OPTS
LimitNOFILE=1048576
LimitNPROC=1048576
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

將配置複製到另外兩個階段

scp /usr/lib/systemd/system/docker.service 192.168.56.12:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/docker.service 192.168.56.13:/usr/lib/systemd/system/

重啓Docker

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 ~]# systemctl restart docker

8.應用建立

1.建立一個測試用的deployment

[root@linux-node1 ~]# kubectl run net-test --image=alpine --replicas=2 sleep 360000

2.查看獲取IP狀況

[root@linux-node1 ~]# kubectl get pod -o wide
NAME                        READY     STATUS    RESTARTS   AGE       IP          NODE
net-test-74f45db489-gmgv8   1/1       Running   0          1m        10.2.83.2   192.168.56.13
net-test-74f45db489-pr5jc   1/1       Running   0          1m        10.2.59.2   192.168.56.12

3.測試聯通性(在對應的node節點去測試)

ping 10.2.83.2

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