Kube-Proxy简述

参考文献：
https://ywnz.com/linuxyffq/2530.html

运行在每个节点上，监听 API Server 中服务对象的变化，再通过管理 IPtables 来实现网络的转发
Kube-Proxy 目前支持三种模式：

• UserSpace
  • k8s v1.2 后就已经淘汰
• IPtables
  • 目前默认方式

• IPVS--推荐，支持7层
  • 需要安装ipvsadm、ipset 工具包和加载 ip_vs 内核模块

kube-proxy部署在hdss7-21,hdss7-22上：

首先安装ipset，ipvsadm

# yum install   ipset  -y 
# yum -y install ipvsadm

然后在hdss7-200上申请证书：

# vi /opt/certs/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

拷贝证书到21，22上：

# cd /opt/kubernetes/server/bin/cert/
# scp hdss7-200:/opt/certs/kube-proxy-client-key.pem ./
# scp hdss7-200:/opt/certs/kube-proxy-client.pem ./

配置：

# 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

编辑开启ipvs内核的脚本：

# 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/nullif [ $? -eq 0 ];then/sbin/modprobe $ifi
done

# chmod u+x /root/ipvs.sh

# sh /root/ipvs.sh

编辑kube-proxy启动脚本：红色部分根据IP修改

# 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 \--proxy-mode=ipvs \--ipvs-scheduler=nq \--kubeconfig ./conf/kube-proxy.kubeconfig

执行权限并创建日志存储目录：

# chmod +x /opt/kubernetes/server/bin/kube-proxy.sh

# mkdir -p /data/logs/kubernetes/kube-proxy

编辑supervisord启动文件：红色部分根据IP修改

# vi /etc/supervisord.d/kube-proxy.ini

[program:kube-proxy-7-21]
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)

更新supervisord：

# supervisorctl update
# supervisorctl status

创建nginx-ds pod：（21上执行就行）

# vi /root/nginx-ds.yaml

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:name: nginx-ds
spec:template:metadata:labels:app: nginx-dsspec:containers:- name: my-nginximage: harbor.od.com/public/nginx:v1.7.9ports:- containerPort: 80

# kubectl create -f nginx-ds.yaml

查看：

# kubectl get pods 

最后验证集群状态：

etcd controller-manager scheduler状态：

#kubectl get cs

nodes状态：

# kubectl get nodes

 pods状态：

#kubectl get pods

至此，kubernets的核心组件已经安装部署完成，接下来会部署附加组件。