k8s之kube-proxy组件 - 《Kubernetes云容器技术专题》

1.hdss7-21安装
2.hdss7-22安装
3 hdss7-200申请证书

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：

1.hdss7-21安装

[root@hdss7-21 ~]# yum install   ipset  -y
[root@hdss7-21 conf]# yum -y install ipvsadm
[root@hdss7-21 ~]#  cd /opt/kubernetes/server/bin/cert/
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/kube-proxy-client-key.pem ./
root@hdss7-200's password: 
kube-proxy-client-key.pem                                                                  100% 1679     1.2MB/s   00:00    
[root@hdss7-21 cert]#  scp hdss7-200:/opt/certs/kube-proxy-client.pem ./
root@hdss7-200's password: 
kube-proxy-client.pem
[root@hdss7-21 cert]#  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://192.168.12.10:7443 \
  --kubeconfig=kube-proxy.kubeconfig
  [root@hdss7-21 conf]# 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
[root@hdss7-21 conf]# kubectl config set-context myk8s-context \
   --cluster=myk8s \
   --user=kube-proxy \
   --kubeconfig=kube-proxy.kubeconfig
[root@hdss7-21 conf]# kubectl config use-context myk8s-context --kubeconfig=kube-proxy.kubeconfig
[root@hdss7-21 conf]# cat /root/ipvs.sh 编辑开启ipvs内核的脚本：
#!/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 conf]# chmod +x  /root/ipvs.sh
[root@hdss7-21 conf]# sh /root/ipvs.sh
[root@hdss7-21 conf]# cat /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
[root@hdss7-21 conf]# chmod +x /opt/kubernetes/server/bin/kube-proxy.sh
[root@hdss7-21 conf]#  mkdir -p /data/logs/kubernetes/kube-proxy
[root@hdss7-21 conf]#  vi /etc/supervisord.d/kube-proxy.ini
[root@hdss7-21 conf]# cat /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)
[root@hdss7-21 conf]# supervisorctl status
etcd-server-7-21                 RUNNING   pid 1297, uptime 4:27:30
kube-apiserver-7-21              RUNNING   pid 48809, uptime 0:40:56
kube-controller-manager-7-21     RUNNING   pid 48870, uptime 0:40:44
kube-kubelet-7-21                RUNNING   pid 28120, uptime 2:23:34
kube-proxy-7-21                  RUNNING   pid 55497, uptime 0:00:32
kube-scheduler-7-21              RUNNING   pid 48860, uptime 0:40:45
[root@hdss7-21 conf]# vi /root/nginx-ds.yaml
[root@hdss7-21 conf]# kubectl create -f /root/nginx-ds.yaml  只需在21机器创建即可

2.hdss7-22安装

[root@hdss7-22 ~]# yum install   ipset  -y
[root@hdss7-22 conf]# yum -y install ipvsadm
[root@hdss7-22 ~]#  cd /opt/kubernetes/server/bin/cert/
[root@hdss7-22 cert]# scp hdss7-200:/opt/certs/kube-proxy-client-key.pem ./
root@hdss7-200's password: 
kube-proxy-client-key.pem                                                                  100% 1679     1.0MB/s   00:00    
[root@hdss7-22 cert]#  scp hdss7-200:/opt/certs/kube-proxy-client.pem ./
root@hdss7-200's password: 
kube-proxy-client.pem
[root@hdss7-22 cert]#  cd /opt/kubernetes/server/bin/conf
[root@hdss7-22 conf]# ll
total 16
-rw-r--r-- 1 root root 2223 Jun  6 16:01 audit.yaml
-rw-r--r-- 1 root root  258 Jun  6 19:32 k8s-node.yaml
-rw------- 1 root root 6175 Jun  7 10:55 kubelet.kubeconfig
[root@hdss7-22 conf]# kubectl config set-cluster myk8s \
>   --certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem \
>   --embed-certs=true \
>   --server=https://192.168.12.10:7443 \
>   --kubeconfig=kube-proxy.kubeconfig
Cluster "myk8s" set.
[root@hdss7-22 conf]#  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
User "kube-proxy" set.
[root@hdss7-22 conf]# kubectl config set-context myk8s-context \
>   --cluster=myk8s \
>   --user=kube-proxy \
>   --kubeconfig=kube-proxy.kubeconfig
Context "myk8s-context" created.
[root@hdss7-22 conf]# kubectl config use-context myk8s-context --kubeconfig=kube-proxy.kubeconfig
Switched to context "myk8s-context".
[root@hdss7-22 conf]# vi /root/ipvs.sh
[root@hdss7-22 conf]# cat /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@hdss7-22 conf]# chmod +x /root/ipvs.sh
[root@hdss7-22 conf]# sh /root/ipvs.sh
[root@hdss7-22 conf]#  vi /opt/kubernetes/server/bin/kube-proxy.sh
[root@hdss7-22 conf]# cat /opt/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 conf]# mkdir -p /data/logs/kubernetes/kube-proxy
[root@hdss7-22 conf]#  vi /etc/supervisord.d/kube-proxy.ini
[root@hdss7-22 conf]# cat /etc/supervisord.d/kube-proxy.ini
[program:kube-proxy-7-22]
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)
[root@hdss7-22 conf]# 
[root@hdss7-22 conf]#  supervisorctl update
kube-proxy-7-22: added process group

3 hdss7-200申请证书

[root@hdss7-200 certs]# cat /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"
        }
    ]
}
[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