二进制部署K8S

用二进制部署K8S，用了 5 台机器， 几乎每个组件都签一套证书，签了5 套证书，搭建ca 服务器，签这么多证书也是很麻烦的事情。

需要签发证书的组件
etcd 集群--3台
apiserver--2台
node 节点:
kubectl
kube-proxy client 和 server 都要签发证书

1. 基础环境准备

5台机器都是centos7.4 系统， 先关闭iptables 和 selinux ， 修改yum 源为阿里云，并且安装常用命令

wget -O /etc/yum.repos.d/CentOS-Base.repo  http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo  http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache
yum install wget net-tools telnet tree nmap sysstat lrzsz dos2unix bind-utils -y

1.1搭建私有dns 服务器

在10.4.7.11 搭建 bind , yum install bind 修改配置文件vi /etc/named.conf

listen-on port 53 { 10.4.7.11; }; 
allow-query     { any; };
forwarders      { 10.4.7.254; };
recursion yes;
dnssec-enable no;
dnssec-validation no
##########
named-checkconf
vi /etc/named.rfc1912.zones
zone "host.com" IN {
        type  master;
        #这个host.com 是内网自定义的
        file  "host.com.zone";

        allow-update { 10.4.7.11; };
};

zone "od.com" IN {
        type  master;
        file  "od.com.zone";
        allow-update { 10.4.7.11; };
};
##########
# 因为定义了 directory  "/var/named"; 这个配置文件的名字要和 上面定义的host.com  od.com 一样才行！
vi  /var/named/host.com.zone
$ORIGIN host.com.
$TTL 600    ; 10 minutes
@       IN SOA  dns.host.com. dnsadmin.host.com. (
                2020032001 ; serial
                10800      ; refresh (3 hours)
                900        ; retry (15 minutes)
                604800     ; expire (1 week)
                86400      ; minimum (1 day)
                )
            NS   dns.host.com.
$TTL 60 ; 1 minute
dns                A    10.4.7.11
HDSS7-11           A    10.4.7.11
HDSS7-12           A    10.4.7.12
HDSS7-21           A    10.4.7.21
HDSS7-22           A    10.4.7.22
HDSS7-200          A    10.4.7.200
##########
vi  /var/named/od.com.zone
$ORIGIN od.com.
$TTL 600    ; 10 minutes
@           IN SOA  dns.od.com. dnsadmin.od.com. (
                2020032001 ; serial
                10800      ; refresh (3 hours)
                900        ; retry (15 minutes)
                604800     ; expire (1 week)
                86400      ; minimum (1 day)
                )
                NS   dns.od.com.
$TTL 60 ; 1 minute
dns                A    10.4.7.11

# 启动dns 服务
named-checkconf 
systemctl start named 
netstat -lntup|grep 53
试着解析几台主机
dig -t A hdss7-11.host.com @10.4.7.11 +short

然后把其他的主机dns 改成10.4.7.11   

vi /etc/sysconfig/network-scripts/ifcfg-eth0

DNS1=10.4.7.11

 1.2 搭建私有 CA 证书服务器

在10.4.7.200 上搭建私有证书服务，用来给k8s 的组件签发证书，后来组件的认证都是通过证书来认证，所以证书很重要，要把证书的时间签长一点！

安装cfssl 

也可以用openssl  颁发证书，这里cfssl了。

#安装cfssl 命令
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -O /usr/bin/cfssl
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -O /usr/bin/cfssl-json
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -O /usr/bin/cfssl-certinfo
chmod +x /usr/bin/cfssl*

然后创建生成ca证书csr的配置文件

mkdir /opt/certs
vi  /opt/certs/ca-csr.json
{
    "CN": "OldboyEdu",
    "hosts": [
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ],
    "ca": {
        "expiry": "175200h"
    }
}
# 证书过期时间是20年！
然后用这个配置文件生成ca 证书
cd /opt/certs 
cfssl gencert -initca ca-csr.json | cfssl-json -bare ca  
会生成 ca.csr ca-csr.json ca-key.pem ca.pem

2 部署docker  和docker harbor 

在 10.4.7.21  22  200 三台机器上部署，先把docker 的镜像仓库改成阿里云的，要不直接docker 的 仓库太慢了

curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun      # 三台机器都执行

mkdir  /etc/docker
vi  /etc/docker/daemon.json
{
  "graph": "/data/docker",
  "storage-driver": "overlay2",
  "insecure-registries": ["registry.access.redhat.com","quay.io","harbor.od.com"],
   "registry-mirrors": ["https://st0d9feo.mirror.aliyuncs.com"]，
   # 这个是我的自己阿里云docker 镜像地址，需要自己注册下。
   "bip": "172.7.21.1/24",      # 这个如果是 7.22   要改成 172.7.22.1/24  7.200 要改成 200.1/24 ,bip 究竟有什么作用呢？

"exec-opts": ["native.cgroupdriver=systemd"],
  "live-restore": true
}

启动docker 

mkdir -p /data/docker
systemctl start docker
systemctl enable docker
docker --version

2.2 部署docker镜像私有仓库harbor

 在10.4.7.200  上部署 docker harbor 

harbor官网github地址
https://github.com/goharbor/harbor
[root@hdss7-200 src]# tar xf harbor-offline-installer-v1.8.3.tgz -C /opt/
[root@hdss7-200 opt]# mv harbor/ harbor-v1.8.3
[root@hdss7-200 opt]# ln -s /opt/harbor-v1.8.3/ /opt/harbor

yum install docker-compose -y
harbor]# ./install.sh 

# 检查harbor 启动情况
# docker-compose ps
# docker ps -a

通过nginx 把harbor 代理出来

[root@hdss7-200 harbor]# yum install nginx -y
[root@hdss7-200 harbor]# vi /etc/nginx/conf.d/harbor.od.com.conf
server {
    listen       80;
    server_name  harbor.od.com;

    client_max_body_size 1000m;

    location / {
        proxy_pass http://127.0.0.1:180;
        # 127.0.0.1:180 是 harbor ip 和端口
    }
}
[root@hdss7-200 harbor]# nginx -t
[root@hdss7-200 harbor]# systemctl start nginx
[root@hdss7-200 harbor]# systemctl enable nginx

然后尝试推送镜像到 harbor 上 

[root@hdss7-200 harbor]# docker login harbor.od.com      #输入 harbor  用户名和密码
[root@hdss7-200 harbor]# docker push harbor.od.com/public/nginx:v1.7.9     # 必须要先在harbor 创建 public 的项目 要不推送不了！

3.部署master节点

3.1 部署etcd 集群

用三台 做master  节点  先部署 etcd 集群，10.4.7.12  做 leader  ， 10.4.7.21  和 22  作为 slave 节点。

开始在 7.200 上配置证书生成文件，给etcd 集群通信用的。    

vi /opt/certs/ca-config.json
{
    "signing": {
        "default": {
            "expiry": "175200h"
        },
        "profiles": {
            "server": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth"
                ]
            },
            "client": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "peer": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
                    "client auth"
                ]
            }
        }
    }
} 


#这里定义了 server  client  peer  3 个 profile ， 后面生成证书会用到，实际上写一个也行，自义定一个 ：k8s 的profile ，后面颁发证书的都用 

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=k8s 组件的csr.json | cfssl-json -bare 组件名字 （写组件名字只是为了好区分）

vi /opt/certs/etcd-peer-csr.json
{
    "CN": "k8s-etcd",
    "hosts": [
        "10.4.7.11",
        "10.4.7.12",
        "10.4.7.21",
        "10.4.7.22"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}

cd /opt/certs/
[root@hdss7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer etcd-peer-csr.json |cfssl-json -bare etcd-peer

 cfssl 的 参数说明 ：

• gencert: 生成新的key(密钥)和签名证书

• -ca：指明ca的证书

• -ca-key：指明ca的私钥文件

• -config：指明请求证书的json文件

• -profile：与-config中profile 必须要有，否则证书创建不了！ 是指根据config中的profile段来生成证书的相关信息

在 10.4.7.12 部署etcd 

wget https://github.com/etcd-io/etcd/releases/download/v3.1.20/etcd-v3.1.20-linux-amd64.tar.gz 
tar xf etcd-v3.1.20-linux-amd64.tar.gz -C /opt/
mkdir -p /opt/etcd/certs /data/etcd /data/logs/etcd-server

#然后把 7.200 上 刚才生成的etcd 证书scp 过来

[root@hdss7-12 certs]# scp 10.4.7.200:/opt/certs/ca.pem .
[root@hdss7-12 certs]# scp 10.4.7.200:/opt/certs/etcd-peer.pem .
[root@hdss7-12 certs]# scp 10.4.7.200:/opt/certs/etcd-peer-key.pem .

　创建etcd 启动脚本

　

vim /opt/etcd/etcd-server-startup.sh
#!/bin/sh
./etcd --name etcd-server-7-12                 
       --data-dir /data/etcd/etcd-server 
       --listen-peer-urls https://10.4.7.12:2380                             # 7.21 和 7.22 要改成对应ip
       --listen-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379     # 7.21 和 7.22 要改成对应ip
--quota-backend-bytes 8000000000  --initial-advertise-peer-urls https://10.4.7.12:2380   # 7.21 和 7.22 要改成对应ip
--advertise-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379  #对外通告的ip
--initial-cluster etcd-server-7-12=https://10.4.7.12:2380,etcd-server-7-21=https://10.4.7.21:2380,etcd-server-7-22=https://10.4.7.22:2380  
--ca-file ./certs/ca.pem  
--cert-file ./certs/etcd-peer.pem  
--key-file ./certs/etcd-peer-key.pem  
--client-cert-auth  --trusted-ca-file ./certs/ca.pem  
--peer-ca-file ./certs/ca.pem  
--peer-cert-file ./certs/etcd-peer.pem 
 --peer-key-file ./certs/etcd-peer-key.pem  
--peer-client-cert-auth  
--peer-trusted-ca-file ./certs/ca.pem  
--log-output stdout 
chmod +x /opt/etcd/etcd-server-startup.sh 
chown -R etcd.etcd /opt/etcd-v3.1.20/ /data/etcd/ /data/logs/etcd-server/ 

　用supervisor 方式 启动etcd，这样停机可以自启动了！

yum install supervisor -y
[root@hdss7-12 ~]# systemctl start supervisord
[root@hdss7-12 ~]# systemctl enable supervisord
[root@hdss7-12 ~]# vi /etc/supervisord.d/etcd-server.ini
[program:etcd-server]
command=/opt/etcd/etcd-server-startup.sh                        ; the program (relative uses PATH, can take args)
numprocs=1                                                      ; number of processes copies to start (def 1)
directory=/opt/etcd                                             ; directory to cwd to before exec (def no cwd)
autostart=true                                                  ; start at supervisord start (default: true)
autorestart=true                                                ; retstart at unexpected quit (default: true)
startsecs=30                                                    ; number of secs prog must stay running (def. 1)
startretries=3                                                  ; max # of serial start failures (default 3)
exitcodes=0,2                                                   ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                 ; signal used to kill process (default TERM)
stopwaitsecs=10                                                 ; max num secs to wait b4 SIGKILL (default 10)
user=etcd                                                       ; setuid to this UNIX account to run the program
redirect_stderr=true                                            ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/etcd-server/etcd.stdout.log           ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                    ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                        ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                     ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                     ; emit events on stdout writes (default false)

supervisorctl update
[root@hdss7-12 ~]# supervisorctl status

　7.12 启动没有问题后 把7.21 和 7.22 按照 刚才的步骤重复一遍，注意改下etcd 启动脚本的ip，然后验证etcd 状态。

[root@hdss7-21 etcd]# ./etcdctl cluster-healthmember 
988139385f78284 is healthy: got healthy result from http://127.0.0.1:2379
member 5a0ef2a004fc4349 is healthy: got healthy result from http://127.0.0.1:2379
member f4a0cb0a765574a8 is healthy: got healthy result from http://127.0.0.1:2379
cluster is healthy

[root@hdss7-21 etcd]# ./etcdctl member list   
988139385f78284: name=etcd-server-7-22 peerURLs=https://10.4.7.22:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.22:2379 isLeader=false
5a0ef2a004fc4349: name=etcd-server-7-21 peerURLs=https://10.4.7.21:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.21:2379 isLeader=false
f4a0cb0a765574a8: name=etcd-server-7-12 peerURLs=https://10.4.7.12:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.12:2379 isLeader=true
#上面就是正常的了

　

3.2.部署kube-apiserver集群

在 10.4.7.21 和 22 上部署，先下载apiserver 包

https://github.com/kubernetes/kubernetes/releases/tag/v1.15.2
CHANGELOG-1.15.md--→server binaries--→kubernetes-server-linux-amd64.tar.gz
# tar xf kubernetes-server-linux-amd64-v1.15.2.tar.gz  -C /opt

cd /opt/kubernetes/server/bin      #会看到bin 下面有一堆的kube 二进制包。

root@hdss7-22 bin]# ll
total 1548820
-rwxr-xr-x 1 root root 43534816 Aug 5 2019 apiextensions-apiserver
drwxr-xr-x 2 root root 228 Apr 21 16:29 cert
-rwxr-xr-x 1 root root 100548640 Aug 5 2019 cloud-controller-manager
-rw-r--r-- 1 root root 8 Aug 5 2019 cloud-controller-manager.docker_tag
-rw-r--r-- 1 root root 144437760 Aug 5 2019 cloud-controller-manager.tar
drwxr-xr-x 2 root root 79 Apr 21 16:34 conf
-rwxr-xr-x 1 root root 200648416 Aug 5 2019 hyperkube
-rwxr-xr-x 1 root root 164501920 Aug 5 2019 kube-apiserver
-rw-r--r-- 1 root root 8 Aug 5 2019 kube-apiserver.docker_tag
-rw-r--r-- 1 root root 208390656 Aug 5 2019 kube-apiserver.tar
-rwxr-xr-x 1 root root 116397088 Aug 5 2019 kube-controller-manager
-rw-r--r-- 1 root root 8 Aug 5 2019 kube-controller-manager.docker_tag
-rw-r--r-- 1 root root 160286208 Aug 5 2019 kube-controller-manager.tar
-rwxr-xr-x 1 root root 36987488 Aug 5 2019 kube-proxy
-rw-r--r-- 1 root root 8 Aug 5 2019 kube-proxy.docker_tag
-rwxr-xr-x 1 root root 189 Apr 21 16:48 kube-proxy.sh
-rw-r--r-- 1 root root 84282368 Aug 5 2019 kube-proxy.tar
-rwxr-xr-x 1 root root 38786144 Aug 5 2019 kube-scheduler
-rw-r--r-- 1 root root 8 Aug 5 2019 kube-scheduler.docker_tag
-rw-r--r-- 1 root root 82675200 Aug 5 2019 kube-scheduler.tar
-rwxr-xr-x 1 root root 40182208 Aug 5 2019 kubeadm
-rwxr-xr-x 1 root root 42985504 Aug 5 2019 kubectl
-rwxr-xr-x 1 root root 119616640 Aug 5 2019 kubelet
-rwxr-xr-x 1 root root 1648224 Aug 5 2019 mounter

又要生成证书了，要生成 apiclient 和 apiserver 两套证书。

hdss7-200.host.com上 签发client 证书：
 vim /opt/certs/client-csr.json

{
    "CN": "k8s-node",
    "hosts": [
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}

 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client-csr.json |cfssl-json -bare client

　　创建生成证书apiserver的json配置文件      vi /opt/certs/apiserver-csr.jso{

    "CN": "k8s-apiserver",
    "hosts": [
        "127.0.0.1",
        "192.168.0.1",
        "kubernetes.default",
        "kubernetes.default.svc",
        "kubernetes.default.svc.cluster",
        "kubernetes.default.svc.cluster.local",
        "10.4.7.10",
        "10.4.7.21",
        "10.4.7.22",
        "10.4.7.23"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}

# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json |cfssl-json -bare apiserver

#把7.200 上生成的证书scp 到 21 和 22 /opt/kubernetes/server/bin/cert 目录

[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/ca.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/ca-key.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/client.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/client-key.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/apiserver.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/apiserver-key.pem .

　

　编写7.21 apiserver 启动脚本和supervisor

vim /opt/kubernetes/server/bin/kube-apiserver.sh
#!/bin/bash
./kube-apiserver 
  --apiserver-count 2 
  --audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log 
  --audit-policy-file ./conf/audit.yaml 
  --authorization-mode RBAC 
  --client-ca-file ./cert/ca.pem 
  --requestheader-client-ca-file ./cert/ca.pem 
  --enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota 
  --etcd-cafile ./cert/ca.pem 
  --etcd-certfile ./cert/client.pem 
  --etcd-keyfile ./cert/client-key.pem 
  --etcd-servers https://10.4.7.12:2379,https://10.4.7.21:2379,https://10.4.7.22:2379 
  --service-account-key-file ./cert/ca-key.pem 
  --service-cluster-ip-range 192.168.0.0/16 
  --service-node-port-range 3000-29999 
  --target-ram-mb=1024 
  --kubelet-client-certificate ./cert/client.pem 
  --kubelet-client-key ./cert/client-key.pem 
  --log-dir  /data/logs/kubernetes/kube-apiserver 
  --tls-cert-file ./cert/apiserver.pem 
  --tls-private-key-file ./cert/apiserver-key.pem 
  --v 2
  
# chmod +x kube-apiserver.sh
# mkdir -p /data/logs/kubernetes/kube-apiserver


vi /etc/supervisord.d/kube-apiserver.ini
  
[program:kube-apiserver]
command=/opt/kubernetes/server/bin/kube-apiserver.sh            ; the program (relative uses PATH, can take args)
numprocs=1                                                      ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin                            ; directory to cwd to before exec (def no cwd)
autostart=true                                                  ; start at supervisord start (default: true)
autorestart=true                                                ; retstart at unexpected quit (default: true)
startsecs=30                                                    ; number of secs prog must stay running (def. 1)
startretries=3                                                  ; max # of serial start failures (default 3)
exitcodes=0,2                                                   ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                 ; signal used to kill process (default TERM)
stopwaitsecs=10                                                 ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                       ; setuid to this UNIX account to run the program
redirect_stderr=true                                            ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stdout.log        ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                    ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                        ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                     ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                     ; emit events on stdout writes (default false)

# mkdir -p /data/logs/kubernetes/kube-apiserver
# supervisorctl update

在 21 和 22 上创建  audit.yaml  文件

[root@hdss7-21 conf]# pwd
/opt/kubernetes/server/bin/conf
[root@hdss7-21 conf]# cat audit.yaml   # 这个文件具体内容没有搞懂
apiVersion: audit.k8s.io/v1beta1 # This is required.
kind: Policy
# Don't generate audit events for all requests in RequestReceived stage.
omitStages:
  - "RequestReceived"
rules:
  # Log pod changes at RequestResponse level
  - level: RequestResponse
    resources:
    - group: ""
      # Resource "pods" doesn't match requests to any subresource of pods,
      # which is consistent with the RBAC policy.
      resources: ["pods"]
  # Log "pods/log", "pods/status" at Metadata level
  - level: Metadata
    resources:
    - group: ""
      resources: ["pods/log", "pods/status"]

  # Don't log requests to a configmap called "controller-leader"
  - level: None
    resources:
    - group: ""
      resources: ["configmaps"]
      resourceNames: ["controller-leader"]

  # Don't log watch requests by the "system:kube-proxy" on endpoints or services
  - level: None
    users: ["system:kube-proxy"]
    verbs: ["watch"]
    resources:
    - group: "" # core API group
      resources: ["endpoints", "services"]

  # Don't log authenticated requests to certain non-resource URL paths.
  - level: None
    userGroups: ["system:authenticated"]
    nonResourceURLs:
    - "/api*" # Wildcard matching.
    - "/version"

  # Log the request body of configmap changes in kube-system.
  - level: Request
    resources:
    - group: "" # core API group
      resources: ["configmaps"]
    # This rule only applies to resources in the "kube-system" namespace.
    # The empty string "" can be used to select non-namespaced resources.
    namespaces: ["kube-system"]

  # Log configmap and secret changes in all other namespaces at the Metadata level.
  - level: Metadata
    resources:
    - group: "" # core API group
      resources: ["secrets", "configmaps"]

  # Log all other resources in core and extensions at the Request level.
  - level: Request
    resources:
    - group: "" # core API group
    - group: "extensions" # Version of group should NOT be included.

  # A catch-all rule to log all other requests at the Metadata level.
  - level: Metadata
    # Long-running requests like watches that fall under this rule will not
    # generate an audit event in RequestReceived.
    omitStages:
      - "RequestReceived"

3.3.部署四层反向代理

在7.11 和7.12 上部署 ， vip 用7.10

yum install nginx keepalived -y

vi /etc/nginx/nginx.conf
stream {
    upstream kube-apiserver {
        server 10.4.7.21:6443     max_fails=3 fail_timeout=30s;
        server 10.4.7.22:6443     max_fails=3 fail_timeout=30s;
    }
    server {
        listen 7443;
        proxy_connect_timeout 2s;
        proxy_timeout 900s;
        proxy_pass kube-apiserver;
    }
}
[root@hdss7-11 etcd]# nginx -t

检查脚本
[root@hdss7-11 ~]# vi /etc/keepalived/check_port.sh
#!/bin/bash
#keepalived 监控端口脚本
#使用方法：
#在keepalived的配置文件中
#vrrp_script check_port {#创建一个vrrp_script脚本,检查配置
#    script "/etc/keepalived/check_port.sh 6379" #配置监听的端口
#    interval 2 #检查脚本的频率,单位（秒）
#}
CHK_PORT=$1
if [ -n "$CHK_PORT" ];then
        PORT_PROCESS=`ss -lnt|grep $CHK_PORT|wc -l`
        if [ $PORT_PROCESS -eq 0 ];then
                echo "Port $CHK_PORT Is Not Used,End."
                exit 1
        fi
else
        echo "Check Port Cant Be Empty!"
fi

[root@hdss7-11 ~]# chmod +x /etc/keepalived/check_port.sh
##########
配置文件
keepalived 主:
[root@hdss7-11 conf.d]# vi /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_defs {
   router_id 10.4.7.11

}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_port.sh 7443"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 251
    priority 100
    advert_int 1
    mcast_src_ip 10.4.7.11
    nopreempt

    authentication {
        auth_type PASS
        auth_pass 11111111
    }
    track_script {
         chk_nginx
    }
    virtual_ipaddress {
        10.4.7.10
    }
}

keepalived 从:
[root@hdss7-12 conf.d]# vi /etc/keepalived/keepalived.conf 

! Configuration File for keepalived
global_defs {
    router_id 10.4.7.12
}
vrrp_script chk_nginx {
    script "/etc/keepalived/check_port.sh 7443"
    interval 2
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 251
    mcast_src_ip 10.4.7.12
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 11111111
    }
    track_script {
        chk_nginx
    }
    virtual_ipaddress {
        10.4.7.10
    }
}

nopreempt：非抢占式

然后启动两台 nginx 和 keepalived  查看vip 在哪台上

3.4.部署controller-manager

　在21 和 22 上部署，包

/opt/kubernetes/server/bin/kube-controller-manager.sh

#!/bin/sh
./kube-controller-manager 
  --cluster-cidr 172.7.0.0/16 
  --leader-elect true 
  --log-dir /data/logs/kubernetes/kube-controller-manager 
  --master http://127.0.0.1:8080 
  --service-account-private-key-file ./cert/ca-key.pem 
  --service-cluster-ip-range 192.168.0.0/16 
  --root-ca-file ./cert/ca.pem 
  --v 2

  chmod +x /opt/kubernetes/server/bin/kube-controller-manager.sh
  mkdir -p /data/logs/kubernetes/kube-controller-manager
  
  /etc/supervisord.d/kube-conntroller-manager.ini
  
[program:kube-controller-manager]
command=/opt/kubernetes/server/bin/kube-controller-manager.sh                     ; the program (relative uses PATH, can take args)
numprocs=1                                                                        ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin                                              ; directory to cwd to before exec (def no cwd)
autostart=true                                                                    ; start at supervisord start (default: true)
autorestart=true                                                                  ; retstart at unexpected quit (default: true)
startsecs=30                                                                      ; number of secs prog must stay running (def. 1)
startretries=3                                                                    ; max # of serial start failures (default 3)
exitcodes=0,2                                                                     ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                                   ; signal used to kill process (default TERM)
stopwaitsecs=10                                                                   ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                                         ; setuid to this UNIX account to run the program
redirect_stderr=true                                                              ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-controller-manager/controller.stdout.log  ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                                      ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                                          ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                                       ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                                       ; emit events on stdout writes (default false)

supervisorctl update

3.5.部署kube-scheduler

 vi /opt/kubernetes/server/bin/kube-scheduler.sh
#!/bin/sh
./kube-scheduler 
  --leader-elect  
  --log-dir /data/logs/kubernetes/kube-scheduler 
  --master http://127.0.0.1:8080 
  --v 2

 chmod +x  /opt/kubernetes/server/bin/kube-scheduler.sh
mkdir -p /data/logs/kubernetes/kube-scheduler

vi /etc/supervisord.d/kube-scheduler.ini
[program:kube-scheduler]
command=/opt/kubernetes/server/bin/kube-scheduler.sh                     ; the program (relative uses PATH, can take args)
numprocs=1                                                               ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin                                     ; directory to cwd to before exec (def no cwd)
autostart=true                                                           ; start at supervisord start (default: true)
autorestart=true                                                         ; retstart at unexpected quit (default: true)
startsecs=30                                                             ; number of secs prog must stay running (def. 1)
startretries=3                                                           ; max # of serial start failures (default 3)
exitcodes=0,2                                                            ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                          ; signal used to kill process (default TERM)
stopwaitsecs=10                                                          ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                                ; setuid to this UNIX account to run the program
redirect_stderr=true                                                     ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-scheduler/scheduler.stdout.log ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                             ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                                 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                              ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                              ; emit events on stdout writes (default false)

supervisorctl update
# supervisorctl status

ln -s /opt/kubernetes/server/bin/kubectl /usr/bin/kubectl

[root@hdss7-22 bin]# kubectl get cs  
NAME STATUS MESSAGE ERROR
etcd-2 Healthy {"health": "true"}
etcd-0 Healthy {"health": "true"}
etcd-1 Healthy {"health": "true"}
scheduler Healthy ok
controller-manager Healthy ok

4.部署node节点

4.1.部署kubelet

在7.21 和 22 上部署kubectl , 先在7.200 上生成kubectl 证书

[root@hdss7-200 certs]# vi kubelet-csr.json
{
    "CN": "k8s-kubelet",
    "hosts": [
    "127.0.0.1",
    "10.4.7.10",
    "10.4.7.21",
    "10.4.7.22",
    "10.4.7.23",
    "10.4.7.24",
    "10.4.7.25",
    "10.4.7.26",
    "10.4.7.27",
    "10.4.7.28"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}

[root@hdss7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet
然后再把刚才生成的证书scp 到 7.21 和 7.22 上

在7.21 上

cd /opt/kubernetes/server/bin/conf  

# 设置集群参数
[root@hdss7-21 conf]# kubectl config set-cluster myk8s 
--certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem 
--embed-certs=true 
--server=https://10.4.7.10:7443 
--kubeconfig=kubelet.kubeconfig
# 设置客户端认证参数
# kubectl config set-credentials k8s-node 
--client-certificate=/opt/kubernetes/server/bin/cert/client.pem 
--client-key=/opt/kubernetes/server/bin/cert/client-key.pem 
--embed-certs=true 
--kubeconfig=kubelet.kubeconfig
# 设置上下文参数
 kubectl config set-context myk8s-context 
--cluster=myk8s 
--user=k8s-node 
--kubeconfig=kubelet.kubeconfig
# 设置默认上下文
kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig

会生成  kubelet.kubeconfig  文件，把这个文件也scp 到7.22 上 

在7.21 上 创建yaml 文件

[root@hdss7-21 conf]# vi k8s-node.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: k8s-node      #要和上面的创建的名字一致
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:node
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: User
  name: k8s-node

kubectl create -f k8s-node.yaml

#检查
 kubectl get clusterrolebinding k8s-node
NAME       AGE
k8s-node   38d

[root@hdss7-200 ~]# docker pull kubernetes/pause
#把pause 镜像推送到私有harbor 上
docker tag f9d5de079539 harbor.od.com/public/pause:latest
# pause 镜像作用是让同一个pod 不同容器之间共享Linux Namespace 和 cgroups ，一个相当于说中间的容器存在，也见 infra container ，
并且整个 Pod 的生命周期是等同于 Infra container 的生命周期的，没有这个pod 就起不来！

在7.21 上
 vi /opt/kubernetes/server/bin/kubelet.sh
#!/bin/sh
./kubelet 
  --anonymous-auth=false 
  --cgroup-driver systemd 
  --cluster-dns 192.168.0.2 
  --cluster-domain cluster.local 
  --runtime-cgroups=/systemd/system.slice 
  --kubelet-cgroups=/systemd/system.slice 
  --fail-swap-on="false" 
  --client-ca-file ./cert/ca.pem 
  --tls-cert-file ./cert/kubelet.pem 
  --tls-private-key-file ./cert/kubelet-key.pem 
  --hostname-override hdss7-21.host.com           #7.22 上改下主机名
  --image-gc-high-threshold 20 
  --image-gc-low-threshold 10 
  --kubeconfig ./conf/kubelet.kubeconfig 
  --log-dir /data/logs/kubernetes/kube-kubelet 
  --pod-infra-container-image harbor.od.com/public/pause:latest 
  --root-dir /data/kubelet

chmod +x /opt/kubernetes/server/bin/kubelet.sh 
[root@hdss7-21 conf]# mkdir -p /data/logs/kubernetes/kube-kubelet   /data/kubelet

vi /etc/supervisord.d/kube-kubelet.ini
[program:kube-kubelet]
command=/opt/kubernetes/server/bin/kubelet.sh     ; the program (relative uses PATH, can take args)
numprocs=1                                        ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin              ; directory to cwd to before exec (def no cwd)
autostart=true                                    ; start at supervisord start (default: true)
autorestart=true                                  ; retstart at unexpected quit (default: true)
startsecs=30                                      ; number of secs prog must stay running (def. 1)
startretries=3                                    ; max # of serial start failures (default 3)
exitcodes=0,2                                     ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                   ; signal used to kill process (default TERM)
stopwaitsecs=10                                   ; max num secs to wait b4 SIGKILL (default 10)
user=root                                         ; setuid to this UNIX account to run the program
redirect_stderr=true                              ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-kubelet/kubelet.stdout.log   ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                      ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                          ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                       ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                       ; emit events on stdout writes (default false)

 supervisorctl  update
supervisorctl status

然后在7.22 上也按照这个步骤执行一次，然后验证

kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
hdss7-21.host.com Ready master,node 38d v1.15.2 10.4.7.21 <none> CentOS Linux 7 (Core) 3.10.0-957.21.3.el7.x86_64 docker://19.3.8
hdss7-22.host.com Ready <none> 38d v1.15.2 10.4.7.22 <none> CentOS Linux 7 (Core) 3.10.0-957.21.3.el7.x86_64 docker://19.3.8

4.2.部署kube-proxy

在7.21 和 22 上部署kube-proxy,   先在200颁发 kube-proxy 证书

[root@hdss7-200 certs]# vi kube-proxy-csr.json
{
    "CN": "system:kube-proxy",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}

 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client kube-proxy-csr.json |cfssl-json -bare kube-proxy-client  
然后把刚才生成的 几个kube-proxy 文件scp 到 21 和 22 上

生成kubeproxy.kubeconfig 文件

在 7.21 上  
cd  /opt/kubernetes/server/bin/conf 

kubectl config set-cluster myk8s 
--certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem 
--embed-certs=true 
--server=https://10.4.7.10:7443 
--kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy 
  --client-certificate=/opt/kubernetes/server/bin/cert/kube-proxy-client.pem 
  --client-key=/opt/kubernetes/server/bin/cert/kube-proxy-client-key.pem 
  --embed-certs=true 
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context myk8s-context 
--cluster=myk8s 
--user=kube-proxy 
--kubeconfig=kube-proxy.kubeconfig

kubectl config use-context myk8s-context --kubeconfig=kube-proxy.kubeconfig

会生成 kube-proxy.kubeconfig 文件 ,把这个文件scp 到 7.22 上 

# 创建kubeproy 启动脚本
vi /opt/kubernetes/server/bin/kube-proxy.sh
#!/bin/sh
./kube-proxy 
  --cluster-cidr 172.7.0.0/16 
  --hostname-override hdss7-21.host.com        #7.22 要改下名字
  --proxy-mode=ipvs 
  --ipvs-scheduler=nq 
  --kubeconfig ./conf/kube-proxy.kubeconfig

ls -l /opt/kubernetes/server/bin/conf/|grep kube-proxy
chmod +x /opt/kubernetes/server/bin/kube-proxy.sh 
mkdir -p /data/logs/kubernetes/kube-proxy

vi /etc/supervisord.d/kube-proxy.ini
[program:kube-proxy]
command=/opt/kubernetes/server/bin/kube-proxy.sh                     ; the program (relative uses PATH, can take args)
numprocs=1                                                           ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin                                 ; directory to cwd to before exec (def no cwd)
autostart=true                                                       ; start at supervisord start (default: true)
autorestart=true                                                     ; retstart at unexpected quit (default: true)
startsecs=30                                                         ; number of secs prog must stay running (def. 1)
startretries=3                                                       ; max # of serial start failures (default 3)
exitcodes=0,2                                                        ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                      ; signal used to kill process (default TERM)
stopwaitsecs=10                                                      ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                            ; setuid to this UNIX account to run the program
redirect_stderr=true                                                 ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-proxy/proxy.stdout.log     ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                         ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                             ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                          ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                          ; emit events on stdout writes (default false)

supervisorctl update
[root@hdss7-21 bin]# supervisorctl status
7.22 上也重复下这个配置

加载ipvs 模块 ，k8s 集群中用ipvs 调度，比iptables 高效！

lsmod |grep ip_vs
[root@hdss7-21 bin]# vi /root/ipvs.sh
#!/bin/bash
ipvs_mods_dir="/usr/lib/modules/$(uname -r)/kernel/net/netfilter/ipvs"
for i in $(ls $ipvs_mods_dir|grep -o "^[^.]*")
do
  /sbin/modinfo -F filename $i &>/dev/null
  if [ $? -eq 0 ];then
    /sbin/modprobe $i
  fi
done    
[root@hdss7-21 bin]# chmod +x /root/ipvs.sh 
[root@hdss7-21 bin]# sh /root/ipvs.sh 
[root@hdss7-21 bin]# lsmod |grep ip_vs

yum install ipvsadm -y
[root@hdss7-21 bin]# ipvsadm -Ln   #查看ipvs 模块转换规则。

[root@hdss7-21 bin]# kubectl get svc

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 192.168.0.1 <none> 443/TCP 38d