kubernetes集群环境搭建(7)
目录
一、kubernetes集群环境搭建
1.1.1 安装部署node节点服务kube-proxy
1 .安装部署kube-proxy服务主机规划
| 主机 | 角色 | ip |
|---|---|---|
| hdss-21 | kube-proxy | 10.0.0.21 |
| hdss-22 | kube-proxy | 10.0.0.22 |
- 签发kube-proxy证书（hdss-201）
创建生成证书签名请求（csr）的JSON配置文件
[root@hdss-201.host.com /opt/certs]# vim /opt/certs/kube-proxy-csr.json
[root@hdss-201.host.com /opt/certs]# cat /opt/certs/kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "guizhou",
"L": "guiyang",
"O": "od",
"OU": "ops"
}
]
}
生成证书
[root@hdss-201.host.com /opt/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
2020/06/15 23:49:42 [INFO] generate received request
2020/06/15 23:49:42 [INFO] received CSR
2020/06/15 23:49:42 [INFO] generating key: rsa-2048
2020/06/15 23:49:42 [INFO] encoded CSR
2020/06/15 23:49:42 [INFO] signed certificate with serial number 438100298835396628078565727365080699742028203116
2020/06/15 23:49:42 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@hdss-201.host.com /opt/certs]# ll
total 100
-rw-r--r-- 1 root root 1249 Jun 13 21:35 apiserver.csr
-rw-r--r-- 1 root root 566 Jun 13 21:31 apiserver-csr.json
-rw------- 1 root root 1679 Jun 13 21:35 apiserver-key.pem
-rw-r--r-- 1 root root 1598 Jun 13 21:35 apiserver.pem
-rw-r--r-- 1 root root 840 Jun 12 21:24 ca-config.json
-rw-r--r-- 1 root root 993 Jun 10 21:49 ca.csr
-rw-r--r-- 1 root root 345 Jun 10 21:48 ca-csr.json
-rw------- 1 root root 1675 Jun 10 21:49 ca-key.pem
-rw-r--r-- 1 root root 1346 Jun 10 21:49 ca.pem
-rw-r--r-- 1 root root 993 Jun 13 21:23 client.csr
-rw-r--r-- 1 root root 280 Jun 13 21:22 client-csr.json
-rw------- 1 root root 1675 Jun 13 21:23 client-key.pem
-rw-r--r-- 1 root root 1363 Jun 13 21:23 client.pem
-rw-r--r-- 1 root root 1062 Jun 12 21:33 etcd-peer.csr
-rw-r--r-- 1 root root 363 Jun 12 21:27 etcd-peer-csr.json
-rw------- 1 root root 1679 Jun 12 21:33 etcd-peer-key.pem
-rw-r--r-- 1 root root 1428 Jun 12 21:33 etcd-peer.pem
-rw-r--r-- 1 root root 1115 Jun 15 21:13 kubelet.csr
-rw-r--r-- 1 root root 451 Jun 15 21:13 kubelet-csr.json
-rw------- 1 root root 1675 Jun 15 21:13 kubelet-key.pem
-rw-r--r-- 1 root root 1468 Jun 15 21:13 kubelet.pem
-rw-r--r-- 1 root root 1005 Jun 15 23:49 kube-proxy-client.csr
-rw------- 1 root root 1675 Jun 15 23:49 kube-proxy-client-key.pem
-rw-r--r-- 1 root root 1375 Jun 15 23:49 kube-proxy-client.pem
-rw-r--r-- 1 root root 267 Jun 15 23:47 kube-proxy-csr.json
- 拷贝证书、私钥
#21
[root@hdss-21.host.com /opt/kubernetes/server/bin/certs]# scp hdss-201:/opt/certs/kube-proxy-client-key.pem ./
root@hdss-201's password:
kube-proxy-client-key.pem 100% 1675 2.1MB/s 00:00
[root@hdss-21.host.com /opt/kubernetes/server/bin/certs]# scp hdss-201:/opt/certs/kube-proxy-client.pem ./
root@hdss-201's password:
kube-proxy-client.pem 100% 1375 1.5MB/s 00:00
[root@hdss-21.host.com /opt/kubernetes/server/bin/certs]# ll
total 40
-rw------- 1 root root 1679 Jun 13 21:49 apiserver-key.pem
-rw-r--r-- 1 root root 1598 Jun 13 21:48 apiserver.pem
-rw------- 1 root root 1675 Jun 13 21:47 ca-key.pem
-rw-r--r-- 1 root root 1346 Jun 13 21:46 ca.pem
-rw------- 1 root root 1675 Jun 13 21:48 client-key.pem
-rw-r--r-- 1 root root 1363 Jun 13 21:48 client.pem
-rw------- 1 root root 1675 Jun 15 21:13 kubelet-key.pem
-rw-r--r-- 1 root root 1468 Jun 15 21:13 kubelet.pem
-rw------- 1 root root 1675 Jun 15 23:52 kube-proxy-client-key.pem
-rw-r--r-- 1 root root 1375 Jun 15 23:52 kube-proxy-client.pem
#22操作相同
- 创建配置文件（分四步）
#21
1、set-cluster
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config set-cluster myk8s
> --certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem
> --embed-certs=true
> --server=https://10.0.0.10:7443
> --kubeconfig=kube-proxy.kubeconfig
Cluster "myk8s" set.
2、set-credentials
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config set-credentials kube-proxy
> --client-certificate=/opt/kubernetes/server/bin/certs/kube-proxy-client.pem
> --client-key=/opt/kubernetes/server/bin/certs/kube-proxy-client-key.pem
> --embed-certs=true
> --kubeconfig=kube-proxy.kubeconfig
User "kube-proxy" set.
3、set-context
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config set-context myk8s-context
> --cluster=myk8s
> --user=kube-proxy
> --kubeconfig=kube-proxy.kubeconfig
Context "myk8s-context" created.
4、use-context
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config use-context myk8s-context --kubeconfig=kube-proxy.kubeconfig
Switched to context "myk8s-context".
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# ll
total 24
-rw-r--r-- 1 root root 2223 Jun 13 22:18 audit.yaml
-rw-r--r-- 1 root root 258 Jun 15 21:47 k8s-node.yaml
-rw------- 1 root root 6195 Jun 15 21:40 kubelet.kubeconfig
-rw------- 1 root root 6215 Jun 16 00:02 kube-proxy.kubeconfig
#22从21拷贝过去即可
[root@hdss-22.host.com /opt/kubernetes/server/bin/config]# scp hdss-21:/opt/kubernetes/server/bin/config/kube-proxy.kubeconfig ./
root@hdss-21's password:
kube-proxy.kubeconfig 100% 6215 5.8MB/s 00:00
[root@hdss-22.host.com /opt/kubernetes/server/bin/config]# ll
total 20
-rw-r--r-- 1 root root 2223 Apr 27 13:49 audit.yaml
-rw------- 1 root root 6195 Jun 15 21:40 kubelet.kubeconfig
-rw------- 1 root root 6215 Jun 16 00:05 kube-proxy.kubeconfig
- 加载ipvs模块 -- 脚本需要设置成开启自动运行
[root@hdss-21.host.com ~]# vim ipvs.sh
[root@hdss-21.host.com ~]# cat 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@hdss-21.host.com ~]# chmod +x ipvs.sh
[root@hdss-21.host.com ~]# ll
total 8
-rw-------. 1 root root 1525 Mar 26 22:43 anaconda-ks.cfg
-rwxr-xr-x 1 root root 231 Apr 27 13:49 ipvs.sh
[root@hdss-21.host.com ~]# sh ipvs.sh
检查是否加载了ipvs模块
[root@hdss-21.host.com ~]# lsmod | grep ip_vs
ip_vs_wrr 12697 0
ip_vs_wlc 12519 0
ip_vs_sh 12688 0
ip_vs_sed 12519 0
ip_vs_rr 12600 0
ip_vs_pe_sip 12740 0
nf_conntrack_sip 33780 1 ip_vs_pe_sip
ip_vs_nq 12516 0
ip_vs_lc 12516 0
ip_vs_lblcr 12922 0
ip_vs_lblc 12819 0
ip_vs_ftp 13079 0
ip_vs_dh 12688 0
ip_vs 145497 24 ip_vs_dh,ip_vs_lc,ip_vs_nq,ip_vs_rr,ip_vs_sh,ip_vs_ftp,ip_vs_sed,ip_vs_wlc,ip_vs_wrr,ip_vs_pe_sip,ip_vs_lblcr,ip_vs_lblc
nf_nat 26583 3 ip_vs_ftp,nf_nat_ipv4,nf_nat_masquerade_ipv4
nf_conntrack 139224 8 ip_vs,nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_netlink,nf_conntrack_sip,nf_conntrack_ipv4
libcrc32c 12644 4 xfs,ip_vs,nf_nat,nf_conntrack
设置开机自动启动
[root@hdss-21.host.com ~]# vim /etc/rc.d/rc.local
[root@hdss-21.host.com ~]# chmod +x /etc/rc.d/rc.local
[root@hdss-21.host.com ~]# ll /etc/rc.d/rc.local
-rwxr-xr-x 1 root root 500 Jun 16 00:39 /etc/rc.d/rc.local
[root@hdss-21.host.com ~]# cat /etc/rc.d/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local
/usr/bin/sh /root/ipvs.sh
#22同上操作
- 写启动脚本
#21
[root@hdss-21.host.com /opt/kubernetes/server/bin]# vim kube-proxy.sh
[root@hdss-21.host.com /opt/kubernetes/server/bin]# cat kube-proxy.sh
#!/bin/sh
./kube-proxy
--cluster-cidr 172.7.0.0/16
--hostname-override hdss-21.host.com
--proxy-mode=ipvs
--ipvs-scheduler=nq
--kubeconfig ./config/kube-proxy.kubeconfig
[root@hdss-21.host.com /opt/kubernetes/server/bin]# chmod +x kube-proxy.sh
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ll kube-proxy.sh
-rwxr-xr-x 1 root root 190 Jun 16 00:43 kube-proxy.sh
创建数据目录和日志目录
[root@hdss-21.host.com /opt/kubernetes/server/bin]# mkdir -p /data/logs/kubernetes/kube-proxy
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ll /data/logs/kubernetes/kube-proxy
total 0
#22操作同上
7.supervisor后台管理启动
[[root@hdss-21.host.com /opt/kubernetes/server/bin]# vim /etc/supervisord.d/kube-proxy.ini
[root@hdss-21.host.com /opt/kubernetes/server/bin]# 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@hdss-21.host.com /opt/kubernetes/server/bin]# supervisorctl update
kube-proxy-21: added process group
[root@hdss-21.host.com /opt/kubernetes/server/bin]# supervisorctl status
etcd-server-21 RUNNING pid 1455, uptime 0:00:00
kube-apiserver-21 RUNNING pid 1452, uptime 0:00:00
kube-controller-manager-21 RUNNING pid 1224, uptime 0:00:00
kube-kubelet-21 RUNNING pid 2053, uptime 2:17:37
kube-proxy-21 RUNNING pid 24234, uptime 0:35:07
kube-scheduler-21 RUNNING pid 1226, uptime 0:00:00
[root@hdss-21.host.com /opt/kubernetes/server/bin]# netstat -luntp |grep kube-proxy
tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 24012/./kube-proxy
tcp6 0 0 :::10256 :::* LISTEN 24012/./kube-proxy
#22操作同上
8.下载ipvsadm(只安装，不启动)
[root@hdss-21.host.com /opt/kubernetes/server/bin]# yum install ipvsadm -y
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:443 nq
-> 10.0.0.21:6443 Masq 1 0 0
-> 10.0.0.22:6443 Masq 1 0 0
[root@hdss-22.host.com /opt/kubernetes/server/bin]# yum install ipvsadm -y
[root@hdss-22.host.com /opt/kubernetes/server/bin]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:443 nq
-> 10.0.0.21:6443 Masq 1 0 0
-> 10.0.0.22:6443 Masq 1 0 0
[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 192.168.0.1 <none> 443/TCP 2d2h
二、验证kubernetes集群
2.1.1 验证kubernetes集群
- 在任意一个运算节点，创建一个资源配置清单
#21
[root@hdss-21.host.com ~]# vim /root/nginx-ds.yaml
[root@hdss-21.host.com ~]# cat /root/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
[root@hdss-21.host.com ~]# kubectl create -f nginx-ds.yaml
daemonset.extensions/nginx-ds created
[root@hdss-21.host.com ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-ds-8cv76 1/1 Running 0 20h
nginx-ds-gt26s 1/1 Running 0 20h
[root@hdss-21.host.com ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-ds-8cv76 1/1 Running 0 20h 10.0.21.2 hdss-21.host.com <none> <none>
nginx-ds-gt26s 1/1 Running 0 20h 10.0.22.2 hdss-22.host.com <none> <none>