Kube-proxy是一个简单的网络代理和负载均衡器，它的作用主要是负责Service的实现，具体来说，就是实现了内部从Pod到Service和外部的从NodePort向Service的访问，每台机器上都运行一个 kube-proxy 服务，它监听 API server 中 service 和 endpoint 的变化情况，并通过 iptables 等来为服务配置负载均衡（仅支持 TCP 和 UDP）。

kube-proxy 可以直接运行在物理机上，也可以以 static pod 或者 daemonset 的方式运行。

主机名 角色 ip
hdss7-21.host.com kube-proxy 10.4.7.21
hdss7-22.host.com kube-proxy 10.4.7.21

#签发并拷贝证书
[root@hdss7-200 certs]# vim kube-proxy-csr.json
{
    "CN": "system:kube-proxy",
    "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=client kube-proxy-csr.json |cfssl-json -bare kube-proxy-client


cd /usr/local/kubernetes/server/bin/cert
scp hdss7-200:/opt/certs/kube-proxy-client.pem .
scp hdss7-200:/opt/certs/kube-proxy-client-key.pem .
cd /usr/local/kubernetes/server/bin/conf
###set-cluster
[root@hdss7-21 conf]# kubectl config set-cluster myk8s \
--certificate-authority=/usr/local/kubernetes/server/bin/cert/ca.pem \
--embed-certs=true \
--server=https://10.4.7.10:7443 \
--kubeconfig=kube-proxy.kubeconfig


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

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

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


[root@hdss7-22 conf]# scp hdss7-21:/usr/local/kubernetes/server/bin/conf/kube-proxy.kubeconfig .

开启ipvs

yum install ipvsadm -y
ipvsadm -Ln

[root@hdss7-21 bin]# lsmod |grep ip_vs
[root@hdss7-21 bin]# vim /data/script/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 /data/script/ipvs.sh
[root@hdss7-21 bin]# sh /data/script/ipvs.sh

[root@hdss7-21 bin]# lsmod |grep ip_vs
ip_vs_wrr              12697  0
ip_vs_wlc              12519  0
ip_vs_sh               12688  0
ip_vs_sed              12519  0

配置启动脚本

[root@hdss7-21 bin]# vim /usr/local/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


[root@hdss7-22 bin]# chmod +x /usr/local/kubernetes/server/bin/kube-proxy.sh
[root@hdss7-22 bin]# mkdir -p /data/logs/kubernetes/kube-proxy


[root@hdss7-21 bin]# vim /etc/supervisord.d/kube-proxy.ini
[program:kube-proxy-7-21]
command=/usr/local/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=/usr/local/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
supervisorctl status


[root@hdss7-22 bin]# vim /usr/local/kubernetes/server/bin/kube-proxy.sh
#!/bin/sh
./kube-proxy \
  --cluster-cidr 172.7.0.0/16 \
  --hostname-override hdss7-22.host.com \
  --proxy-mode=ipvs \
  --ipvs-scheduler=nq \
  --kubeconfig ./conf/kube-proxy.kubeconfig


[root@hdss7-22 bin]# vim /etc/supervisord.d/kube-proxy.ini
[program:kube-proxy-7-22]
command=/usr/local/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=/usr/local/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
supervisorctl status

[root@hdss7-22 bin]# chmod +x /usr/local/kubernetes/server/bin/kube-proxy.sh
[root@hdss7-22 bin]# mkdir -p /data/logs/kubernetes/kube-proxy

检查集群是否配置好

[root@hdss7-21 bin]# 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"}


[root@hdss7-21 bin]# kubectl get node
NAME                STATUS   ROLES         AGE   VERSION
hdss7-21.host.com   Ready    master,node   9h    v1.15.2
hdss7-22.host.com   Ready    master,node   10h   v1.15.2

配置nginx的yaml

[root@hdss7-21 ~]# vim /data/script/nginx-ds.yaml
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: nginx-ds
spec:
  template:
    metadata:
      labels:
        app: nginx-ds
    spec:
      containers:
      - name: my-nginx
        image: harbor.od.com/public/nginx:v1.7.9
        ports:
        - containerPort: 80

kubectl apply -f nginx-ds.yaml

[root@hdss7-21 ~]# kubectl get pod -A -o wide
NAMESPACE   NAME             READY   STATUS    RESTARTS   AGE   IP           NODE                NOMINATED NODE   READINESS GATES
default     nginx-ds-2tb4c   1/1     Running   1          18h   172.7.22.2   hdss7-22.host.com   <none>           <none>
default     nginx-ds-2w2nx   1/1     Running   1          18h   172.7.21.2   hdss7-21.host.com   <none>           <none>


curl 172.7.21.2 

22不能通是因为还没有安装网络组件，所有不能跨节点通信。

kube-proxy安装完成

Last modification：May 6, 2022
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