部署一个完整的K8S集群(下)

部署UI

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[root@k8s-master1 YAML]# kubectl apply -f dashboard.yaml

namespace/kubernetes-dashboard created

serviceaccount/kubernetes-dashboard created

service/kubernetes-dashboard created

secret/kubernetes-dashboard-certs created

secret/kubernetes-dashboard-csrf created

secret/kubernetes-dashboard-key-holder created

configmap/kubernetes-dashboard-settings created

role.rbac.authorization.k8s.io/kubernetes-dashboard created

clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created

rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created

clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created

deployment.apps/kubernetes-dashboard created

service/dashboard-metrics-scraper created

deployment.apps/dashboard-metrics-scraper created

[root@k8s-master1 YAML]# kubectl get pods -n kubernetes-dashboard

NAME READY STATUS RESTARTS AGE

dashboard-metrics-scraper-566cddb686-v5s8t 1/1 Running 0 22m

kubernetes-dashboard-7b5bf5d559-sqpd7 1/1 Running 0 22m

[root@k8s-master1 YAML]# kubectl get svc -n kubernetes-dashboard

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

dashboard-metrics-scraper ClusterIP 10.0.0.180 8000/TCP 23m

kubernetes-dashboard NodePort 10.0.0.163 443:30001/TCP 23m

[root@k8s-master1 YAML]# kubectl apply -f dashboard-adminuser.yaml

serviceaccount/admin-user created

clusterrolebinding.rbac.authorization.k8s.io/admin-user created

创建能访问dashboard的token

[root@k8s-master1 src]#kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')

Name: admin-user-token-2k5k9

Namespace: kubernetes-dashboard

Labels:

Annotations: kubernetes.io/service-account.name: admin-user

kubernetes.io/service-account.uid: 14110df7-4a24-4a06-a99e-18c3a60c5b13

Type: kubernetes.io/service-account-token

Data

====

ca.crt: 1359 bytes

namespace: 20 bytes

token: eyJhbGciOiJSUzI1NiIsImtpZCI6IkV5VUtIek9UeUs1WnRnbzJzVzgyaEJKblM3UDFiMXdHTEdPeFhkZmxwaDAifQ.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.eURKAOmq-DOPyf7B_ZH2nIg4QxcMhmy6VL4miZuoXx7g70V69rhQjEdR156TujxHkXIFz4X6biifycm_gLxShn2sAwoiBohzKOogJZLo1hXWl6pAGHbAGLuEZsvN5GrSmyUhC955ztheNve0xx5QTwFLtXFSOuTwnzzKEHYMyfivYTVmf8iovx0S2SS1IQxqFOZxMNH5DKUCK7tleEZxnXcHzUG2zTSn6D7nL8EtAzOAD_kVx6dKsQt4fbMqiOcyG_qFfFopU9ZJwsILTDma4k3iecRAb4KmNlRaasFdXLptF6SDs0IceHqE9hm3yoOB7pZXWsptNafmcrFCSOEjaQ

部署一个完整的K8S集群(下)

访问如上链接，有两种验证方式，其一，配置文件验证，其二，token验证，现在选择第二种方式，Token验证登陆，并填入绿色文字的token。

部署一个完整的K8S集群(下)

已上画面为登陆dashboard已经成功了

部署coreDNS:

[root@k8s-master1 YAML]# kubectl apply -f coredns.yaml

serviceaccount/coredns created

clusterrole.rbac.authorization.k8s.io/system:coredns created

clusterrolebinding.rbac.authorization.k8s.io/system:coredns created

configmap/coredns created

deployment.apps/coredns created

service/kube-dns created

运用bs.yml文件进行测试，看看dns是否能解析

[root@k8s-master1 src]#kubectl apply -f bs.yaml

pod/busybox created

[root@k8s-master1 YAML]# kubectl get pods

NAME READY STATUS RESTARTS AGE

busybox 1/1 Running 0 6m47s

web-d86c95cc9-8tmkl 1/1 Running 0 65m

进入busybox，Ping对应的docker，看看能否解析

[root@k8s-master1 YAML]# kubectl exec -it busybox sh

/ # ping web

PING web (10.0.0.203): 56 data bytes

64 bytes from 10.0.0.203: seq=0 ttl=64 time=0.394 ms

64 bytes from 10.0.0.203: seq=1 ttl=64 time=0.323 ms

--- web ping statistics ---

2 packets transmitted, 2 packets received, 0% packet loss

round-trip min/avg/max = 0.323/0.358/0.394 ms

/ # ping kubernetes

PING kubernetes (10.0.0.1): 56 data bytes

64 bytes from 10.0.0.1: seq=0 ttl=64 time=0.344 ms

64 bytes from 10.0.0.1: seq=1 ttl=64 time=0.239 ms

--- kubernetes ping statistics ---

2 packets transmitted, 2 packets received, 0% packet loss

round-trip min/avg/max = 0.239/0.291/0.344 ms

/ #

如上所示，可以解析，代表coredns已经安装OK了

部署keepalived nginx（两台机都需要部署）

[root@lvs1 ~]# rpm -ivh http://nginx.org/packages/rhel/7/x86_64/RPMS/nginx-1.16.0-1.el7.ngx.x86_64.rpm

Retrieving http://nginx.org/packages/rhel/7/x86_64/RPMS/nginx-1.16.0-1.el7.ngx.x86_64.rpm

warning: /var/tmp/rpm-tmp.oiFMgm: Header V4 RSA/SHA1 Signature, key ID 7bd9bf62: NOKEY

Preparing... ################################# [100%]

Updating / installing...

1:nginx-1:1.16.0-1.el7.ngx ################################# [100%]

----------------------------------------------------------------------

Thanks for using nginx!

Please find the official documentation for nginx here:

* http://nginx.org/en/docs/

Please subscribe to nginx-announce mailing list to get

the most important news about nginx:

* http://nginx.org/en/support.html

Commercial subscriptions for nginx are available on:

* http://nginx.com/products/

----------------------------------------------------------------------

[root@lvs1 ~]# systemctl enable nginx

Created symlink from /etc/systemd/system/multi-user.target.wants/nginx.service to /usr/lib/systemd/system/nginx.service.

[root@lvs1 ~]# systemctl status nginx

● nginx.service - nginx - high performance web server

Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)

Active: inactive (dead)

Docs: http://nginx.org/en/docs/

[root@lvs1 ~]# systemctl start nginx

[root@lvs1 ~]# systemctl status nginx

● nginx.service - nginx - high performance web server

Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)

Active: active (running)since Sat 2020-02-01 14:41:09 CST; 11s ago

Docs: http://nginx.org/en/docs/

Process: 1681 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)

Main PID: 1682 (nginx)

CGroup: /system.slice/nginx.service

├─1682 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf

└─1683 nginx: worker process

Feb 01 14:41:09 lvs1 systemd[1]: Starting nginx - high performance web server...

Feb 01 14:41:09 lvs1 systemd[1]: Started nginx - high performance web server.

[root@lvs1 ~]# yum install keepalived -y

Loaded plugins: fastestmirror

Determining fastest mirrors

* base: mirrors.aliyun.com

* extras: mirrors.cn99.com

* updates: mirrors.aliyun.com

base | 3.6 kB 00:00:00

extras | 2.9 kB 00:00:00

updates | 2.9 kB 00:00:00

(1/2): extras/7/x86_64/primary_db | 159 kB 00:00:00

(2/2): updates/7/x86_64/primary_db | 5.9 MB 00:00:01

Resolving Dependencies

--> Running transaction check

---> Package keepalived.x86_64 0:1.3.5-16.el7 will be installed

--> Processing Dependency: libnetsnmpmibs.so.31()(64bit) for package: keepalived-1.3.5-16.el7.x86_64

--> Processing Dependency: libnetsnmpagent.so.31()(64bit) for package: keepalived-1.3.5-16.el7.x86_64

--> Processing Dependency: libnetsnmp.so.31()(64bit) for package: keepalived-1.3.5-16.el7.x86_64

--> Running transaction check

---> Package net-snmp-agent-libs.x86_64 1:5.7.2-43.el7 will be installed

--> Processing Dependency: libsensors.so.4()(64bit) for package: 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64

---> Package net-snmp-libs.x86_64 1:5.7.2-43.el7 will be installed

--> Running transaction check

---> Package lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================================================================================

Package Arch Version Repository Size

=========================================================================================================================================================================

Installing:

keepalived x86_64 1.3.5-16.el7 base 331 k

Installing for dependencies:

lm_sensors-libs x86_64 3.4.0-8.20160601gitf9185e5.el7 base 42 k

net-snmp-agent-libs x86_64 1:5.7.2-43.el7 base 706 k

net-snmp-libs x86_64 1:5.7.2-43.el7 base 750 k

Transaction Summary

=========================================================================================================================================================================

Install 1 Package (+3 Dependent packages)

Total download size: 1.8 M

Installed size: 6.0 M

Downloading packages:

(1/4): lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64.rpm | 42 kB 00:00:00

(2/4): net-snmp-agent-libs-5.7.2-43.el7.x86_64.rpm | 706 kB 00:00:00

(3/4): net-snmp-libs-5.7.2-43.el7.x86_64.rpm | 750 kB 00:00:00

(4/4): keepalived-1.3.5-16.el7.x86_64.rpm | 331 kB 00:00:01

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Total 1.0 MB/s | 1.8 MB 00:00:01

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

Warning: RPMDB altered outside of yum.

Installing : 1:net-snmp-libs-5.7.2-43.el7.x86_64 1/4

Installing : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 2/4

Installing : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64 3/4

Installing : keepalived-1.3.5-16.el7.x86_64 4/4

Verifying : keepalived-1.3.5-16.el7.x86_64 1/4

Verifying : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64 2/4

Verifying : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 3/4

Verifying : 1:net-snmp-libs-5.7.2-43.el7.x86_64 4/4

Installed:

keepalived.x86_64 0:1.3.5-16.el7

Dependency Installed:

lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7 net-snmp-agent-libs.x86_64 1:5.7.2-43.el7 net-snmp-libs.x86_64 1:5.7.2-43.el7

Complete!

主keepalived配置文件：

[root@lvs1 nginx]# cat /etc/keepalived/keepalived.conf

global_defs {

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id NGINX_MASTER

}

vrrp_script check_nginx {

script "/etc/keepalived/check_nginx.sh"

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的

priority 100 # 优先级，备服务器设置 90

advert_int 1 # 指定VRRP 心跳包通告间隔时间，默认1秒

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.120

}

track_script {

check_nginx

}

主nginx配置文件：

[root@lvs1 nginx]# cat /etc/nginx/nginx.conf

user nginx;

worker_processes 4;

error_log /var/log/nginx/error.log warn;

pid /var/run/nginx.pid;

events {

worker_connections 1024;

}

stream {

log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';

access_log /var/log/nginx/k8s-access.log main;

upstream k8s-apiserver {

server 192.168.1.124:6443;

server 192.168.1.125:6443;

server 192.168.1.126:6443;

}

server {

listen 6443;

proxy_pass k8s-apiserver;

}

http {

include /etc/nginx/mime.types;

default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] "$request" '

'$status $body_bytes_sent "$http_referer" '

'"$http_user_agent" "$http_x_forwarded_for"';

access_log /var/log/nginx/access.log main;

sendfile on;

#tcp_nopush on;

keepalive_timeout 65;

#gzip on;

include /etc/nginx/conf.d/*.conf;

}

备keepalived配置文件

[root@lvs2 keepalived]# cat /etc/keepalived/keepalived.conf

global_defs {

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id NGINX_BACKUP

}

vrrp_script check_nginx {

script "/etc/keepalived/check_nginx.sh"

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的

priority 90 # 优先级，备服务器设置 90

advert_int 1 # 指定VRRP 心跳包通告间隔时间，默认1秒

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.120

}

track_script {

check_nginx

}

从nginx配置文件：

[root@lvs2 keepalived]# cat /etc/nginx/nginx.conf

user nginx;

worker_processes 4;

error_log /var/log/nginx/error.log warn;

pid /var/run/nginx.pid;

events {

worker_connections 1024;

}

stream {

log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';

access_log /var/log/nginx/k8s-access.log main;

upstream k8s-apiserver {

server 192.168.1.124:6443;

server 192.168.1.125:6443;

server 192.168.1.126:6443;

}

server {

listen 6443;

proxy_pass k8s-apiserver;

}

http {

include /etc/nginx/mime.types;

default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] "$request" '

'$status $body_bytes_sent "$http_referer" '

'"$http_user_agent" "$http_x_forwarded_for"';

access_log /var/log/nginx/access.log main;

sendfile on;

#tcp_nopush on;

keepalive_timeout 65;

#gzip on;

include /etc/nginx/conf.d/*.conf;

}

nginx检测脚本：

nginx脚本要加可执行权限：

[root@lvs1 nginx]# chmod +x /etc/keepalived/check_nginx.sh

[root@lvs2 nginx]# chmod +x /etc/keepalived/check_nginx.sh

[root@lvs2 keepalived]# cat check_nginx.sh

#!/bin/bash

count=$(ps -ef |grep nginx |egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then

exit 1

else

exit 0

[root@lvs1 nginx]# systemctl restart keepalived && systemctl restart nginx

[root@lvs2 nginx]# systemctl restart keepalived && systemctl restart nginx

修改node1,node2,node3节点种的apiserver的接口地址，改成负载均衡器的IP地址即可，然后再重启 kubelet和kube-proxy

[root@k8s-node1 cfg]# grep "192.168" *

bootstrap.kubeconfig: server: https://192.168.1.124:6443

kubelet.kubeconfig: server: https://192.168.1.124:6443

kube-proxy.kubeconfig: server: https://192.168.1.124:6443

[root@k8s-node1 cfg]# sed -i "s#192.168.1.124#192.168.1.120#g" *

[root@k8s-node1 cfg]# grep "192.168" *

bootstrap.kubeconfig: server: https://192.168.1.120:6443

kubelet.kubeconfig: server: https://192.168.1.120:6443

kube-proxy.kubeconfig: server: https://192.168.1.120:6443

[root@k8s-node1 cfg]# systemctl restart kubelet && systemctl restart kube-proxy

[root@k8s-node2 cfg]# sed -i "s#192.168.1.124#192.168.1.120#g" *

[root@k8s-node2 cfg]# grep "192.168" *

bootstrap.kubeconfig: server: https://192.168.1.120:6443

kubelet.kubeconfig: server: https://192.168.1.120:6443

kube-proxy.kubeconfig: server: https://192.168.1.120:6443

[root@k8s-node2 cfg]# systemctl restart kubelet && systemctl restart kube-proxy

[root@k8s-node3 cfg]# sed -i "s#192.168.1.124#192.168.1.120#g" *

[root@k8s-node3 cfg]# grep "192.168" *

bootstrap.kubeconfig: server: https://192.168.1.120:6443

kubelet.kubeconfig: server: https://192.168.1.120:6443

kube-proxy.kubeconfig: server: https://192.168.1.120:6443

[root@k8s-node3 cfg]# systemctl restart kubelet && systemctl restart kube-proxy

命令检测k8s的集群状态，依旧是Ready状态。集群正常，也可以去查看Nginx的日志，观察是否异常

[root@k8s-master1 k8s]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

k8s-node1 Ready 4h28m v1.16.0

k8s-node2 Ready 4h28m v1.16.0

k8s-node3 Ready 4h28m v1.16.0

[root@lvs1 nginx]# tailf /var/log/nginx/k8s-access.log

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:34:19 +0800] 200 1160

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:34:19 +0800] 200 1159

192.168.1.129 192.168.1.126:6443 - [01/Feb/2020:15:34:19 +0800] 200 1160

192.168.1.129 192.168.1.126:6443 - [01/Feb/2020:15:34:19 +0800] 200 1159

192.168.1.129 192.168.1.126:6443 - [01/Feb/2020:15:34:19 +0800] 200 1160

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:34:19 +0800] 200 1160

192.168.1.129 192.168.1.125:6443 - [01/Feb/2020:15:34:39 +0800] 200 1611

192.168.1.128 192.168.1.126:6443 - [01/Feb/2020:15:34:39 +0800] 200 1611

192.168.1.127 192.168.1.126:6443 - [01/Feb/2020:15:34:39 +0800] 200 1611

[root@lvs2 keepalived]# tailf /var/log/nginx/k8s-access.log

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:33:44 +0800] 200 1161

192.168.1.127 192.168.1.125:6443 - [01/Feb/2020:15:33:44 +0800] 200 1159

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:33:44 +0800] 200 1160

192.168.1.129 192.168.1.124:6443 - [01/Feb/2020:15:33:44 +0800] 200 1159

192.168.1.129 192.168.1.125:6443 - [01/Feb/2020:15:33:44 +0800] 200 1161

192.168.1.129 192.168.1.126:6443 - [01/Feb/2020:15:33:44 +0800] 200 1161

192.168.1.129 192.168.1.125:6443 - [01/Feb/2020:15:33:44 +0800] 200 1159

192.168.1.128 192.168.1.126:6443 - [01/Feb/2020:15:33:44 +0800] 200 1161

192.168.1.128 192.168.1.125:6443 - [01/Feb/2020:15:49:06 +0800] 200 2269

192.168.1.129 192.168.1.125:6443 - [01/Feb/2020:15:51:11 +0800] 200 2270

192.168.1.127 192.168.1.125:6443 - [01/Feb/2020:15:51:47 +0800] 200 2270

192.168.1.128 192.168.1.124:6443 - [01/Feb/2020:15:51:56 +0800] 200 4352

192.168.1.127 192.168.1.124:6443 - [01/Feb/2020:15:52:04 +0800] 200 5390

192.168.1.129 192.168.1.125:6443 - [01/Feb/2020:15:52:07 +0800] 200 4409

代表能正常切换，K8S集群搭建OK

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