【Kubernetes】k8s多集群切换【含上下文作用详解】,2024年最新jpa和mybatis的区别面试
对于面试,一定要有良好的心态,这位小伙伴面试美团的时候没有被前面阿里的面试影响到,发挥也很正常,也就能顺利拿下美团的offer。小编还整理了大厂java程序员面试涉及到的绝大部分面试题及答案,希望能帮助到大家,也祝愿大家都能够升职加薪!一个人可以走的很快,但一群人才能走的更远。不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人,都欢迎扫码加入我们的的圈子(技术交流、学习资源、职场吐槽、大厂内推
[root@master .kube]# cat config
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: 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
server: https://192.168.59.142:6443
name: master
- cluster:
certificate-authority-data: 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
server: https://192.168.59.151:6443
name: master1
contexts:
- context:
cluster: master
namespace: default
user: ccx
name: context
- context:
cluster: master1
namespace: default
user: ccx1
name: context1
current-context: context
kind: Config
preferences: {}
users:
- name: ccx
user:
client-certificate-data: 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
client-key-data: LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0tLQpNSUlFb3dJQkFBS0NBUUVBeTJFU3hUazFjakJBZGlRVTZ1TXdkNXZuKzcvdU41Y2pMaVBPUjU3d3dYb0RaNElKClcwQW1hYjE3ME1QY3Z4ZEh1b25LbVpBTElKUW0wU2RaS2IxZjQ2THdPTE1FNG4waFYzRWdWYnZWTVJLQTNPb1EKTTl2bWtjbDlWUHRJdC9jRjIvMmUxaGtPdGRISFlnU0V1RHdJRi9zYUNSYytWTFozYWw0bE5FOU1SSmU4WlVMVApTei9QaWhGU2JoSTIzNUdpY0xLSWw3MmJhTDdTMW5VR1R1TlNEaTNwOHJJdTVmZXZDcnpQTTdLWHZxK3pnSStKCjc3cHp3b1h4WUFvMS9WQ2JIRmZqWTVIS3dMZkh6NkRlR3VxRmNhVFZGTm5oWnpNTXF1b0JhZjRWYmFpQWQyR28KTjI1aVNOa3FhYVZNLzFFNzZxV1RONUhCeTBwTmRCZWdDRmRLZ3dJREFRQUJBb0lCQUVtQ3BNNDBoMlRtbStZWAoxSmV4MW1ybEoweVBhd01jMWRKdmpyZkVjekQ3Y1ErUXFPRWFwc2ZCZldkUDVCSU4wQmRVaHE1S3FqcjBVYk4zCmpYclF3RC8vUE9UQmtCcHRNQWZ6RThUcFIzMmRPb2FlODR4TEIyUGFlRHFuT1BtRmg5Q2tNeTBma1htV2dZS2sKTDNTSC9rVHN0ZFJqV2x3ME42VnlzZS9lV2FyUXFEZXJzNFFTU2xaVGxlcUVGdVFadk1rNXp4QVZmYjEzUFBJcApORTZySW9pajZIOVdvWmdoMmYzNDdyME52VmJpekdYNUE5RTNjOG51NkVWQlpqS0FqeWRaTkpyU2VRTEtMZDF3CmtGL0J1ZTM2RkltRWtLdlByNTAxSnJ4VEJEUnFsMEdkUnpxY3RxTDdkaHdKa0t4TUt1akpCeGFucTNRSGQzSmcKR0VnMFBNRUNnWUVBMWlhOHZMM1crbnRjNEZOcDZjbzJuaHVIcTNKdGVrQlVILzlrUnFUYlFnaUpBVW9ld3BGdwprRjROMUhsR21WWngwWkVTTVhkTGozYXdzY2lWUFRqZVRJK216VDA0MUVyRzdNVnhuM05KZy96VlhUY0FITmJqCmZhR3o1UlZwaERieUZtRTRvcUlpWHFuY050Y2ZmRE9XQ3NNU2ZCODlPMW1LTFpEYjJ4WjZsQ2NDZ1lFQTh4OXgKZWhFeHNKRFljOXFTSnlCcVQyNlozek5GRmlWV1JNUE9NWEYrbFNBZDc4eWpVanZEaDg3NXRzdG4wV1pBY05kUApQcGg1Tm1wbzVNUTVSMmE5Z2J1NGVxZjArZ2o0WHM0RytySW5iYlE2Q3ZwZW9RYVVtZUJ3UVBqcXJFZnVPZUpvCjU1VnRYNGRHc0EzOHV0dllycmsyYU16ejdmcnRON3JjNVo5VlJFVUNnWUVBeFp0MUtVeWI1UUtVajBNcFJsd2IKemdWbFNXVUxkSFdMcXdNRlN0S3dwOXdzWUE0L0dCY1FvWWJJaURsb1ZmSVlrT0ttd1JKdG5QSk8xWjViWitUago3QTNhUXlTdEhlZnFhMjArRFg1YVpmcVYvNi9TNE1uQm5abnE0QWJFR1FhQ21QZ1pSS2tMd2dKSGZDdEJtR0FaCm9kQ2phL2wvalJad2xOOUlvSCs3bUowQ2dZQUVEUTRTL3A1WlZ0Q0VmYXZad3d5Q2JsRmFDcnluOWM5T0xnVU4KaGRxYUdZTG1MLzY0ckE1Q0FRemdJdHVEL2JRdExTbEEzY0dIU3BhYzJUZ3JIR2NqOWtESXFtdkdqc2UwckxJcApFemJjK1JmT2Z3VjhvV053ZlBEaDVFUGt3djRSTU5pV28wTERTTG5BelRyYzBqVDJGRmYzdnhLQmNLRHJRTTNWCmRhWXlFUUtCZ0ROMUVRNUhYdGlEbi9nMllUMzVwQWNNZjNrbVZFYTVPWHZONDFXSHJOZHhieUJJZ2Fkc2pUZjIKZTJiZnBKNzBJcHFqV2JITG1ENzZjUzNTZmFXSDFCVDdiRnZ4cWg4dUtXUXFoeWhzdTZWZ1VWNWNyQnp5cVVtNgpRcXFoeEx2STZsaWgrRGUwU3F3eDh5b1J5QUNXU0NYRDM2K3JmbGZoZnExd2pqdFF1VHBsCi0tLS0tRU5EIFJTQSBQUklWQVRFIEtFWS0tLS0tCg==
- name: ccx1
user:
client-certificate-data: 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
client-key-data: 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
[root@master .kube]#
至此,多集群就配置完成了。
集群6443端口不可达报错处理
- 报错信息是你当前所属集群IP端口不可达
The connection to the server 192.168.59.151:6443 was refused - did you specify the right host or port?
-
思路:
-
1、查看docker服务是否为active:
systemctl is-active docker
-
2、查看kubectl服务是否为active:
systemctl is-active kubelet
-
3、检查配置文件:
~/.kube/config
是否有误 -
4、查看镜像是否缺失:
docker images
【如果镜像少了,补上,然后重新启动上面2个服务,所有镜像会自动启动(不要尝试手动启动镜像,有顺序的,重启上面2服务docker会自动按顺序拉起服务)】 -
5、查看端口是否被监听:
netstat -ntlp | grep 6443
-
6、查看服务是否正常:
docker ps
【正常的应该有17个左右】 -
7、查看系统日志:
journalctl -xeu kubelet
【一般这里面会有原因】
[root@master ~]# systemctl is-active docker
active
[root@master ~]# systemctl is-active kubelet
active
[root@master ~]#
[root@master ~]# netstat -ntlp | grep 6443
tcp6 0 0 :::6443 ::😗 LISTEN 19672/kube-apiserve
[root@master ~]#
[root@master ~]# docker ps | wc -l
17
[root@master ~]#
- 但我这比较特别,我问题集群的所有服务都正常,在问题集群上也能单独使用,各种排错无果,最后想到我第二个集群是通过克隆的,去配置文件确实发现我2个集群的key是一样的,所以理论上这2个集群是一摸一样的,IP不能变啊。
现在报错如下
[root@master ~]# kubectl config use-context context1
Switched to context “context1”.
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
context master ccx default
-
context1 master1 ccx1 default
[root@master ~]#
[root@master ~]# kubectl get nodes
The connection to the server 192.168.59.151:6443 was refused - did you specify the right host or port?
[root@master ~]#
- 为了验证我的想法,我在配置文件中将第二个集群的ip改成和我第一个集群ip一样,其他什么都不修改【key依然是第二个集群的key】,然后再次访问,成功了
[root@master ~]# cat .kube/config | grep server
server: https://192.168.59.142:6443
server: https://192.168.59.142:6443
[root@master ~]#
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
context master ccx default
-
context1 master1 ccx1 default
[root@master ~]#
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 6d v1.21.0
node1 Ready 6d v1.21.0
node2 Ready 5d22h v1.21.0
[root@master ~]#
[root@master ~]# kubectl get pods
No resources found in default namespace.
[root@master ~]# kubectl get pods -n ccx
NAME READY STATUS RESTARTS AGE
centos-7846bf67c6-s9tmg 0/1 ImagePullBackOff 0 23h
nginx-test-795d659f45-j9m9b 0/1 ImagePullBackOff 0 24h
nginx-test-795d659f45-txf8l 0/1 ImagePullBackOff 0 24h
[root@master ~]#
- 总结就是:master集群不能克隆!!!!!!!大半天时间总结的坑啊
当然,克隆也不是不行,我博客中有一篇是:“【kubernetes】k8s的安装详细说明【创建集群、加入集群、踢出集群、重置集群…】” ,根据这里面的方法去重置集群即可,然后再重复上面的步骤,便一切正常
泪目。。。花了大半天总结出来的坑啊
[root@master ~]# cat .kube/config| grep server
server: https://192.168.59.142:6443
server: https://192.168.59.151:6443
[root@master ~]#
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
-
context master ccx default
context1-new master1 ccx1 default
[root@master ~]# kubecon^C
[root@master ~]#
[root@master ~]# kubectl config use-context context1-new
Switched to context “context1-new”.
[root@master ~]# kubectl get pods
No resources found in default namespace.
[root@master ~]# kubectl get pods -n ccx
No resources found in ccx namespace.
[root@master ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-78d6f96c7b-q25lf 1/1 Running 0 7m36s
calico-node-g2wfj 1/1 Running 0 7m36s
calico-node-gtfbc 1/1 Running 0 7m36s
calico-node-nd29t 1/1 Running 0 6m49s
coredns-545d6fc579-j4ckc 1/1 Running 0 12m
coredns-545d6fc579-qn4kz 1/1 Running 0 12m
etcd-master2 1/1 Running 0 12m
kube-apiserver-master2 1/1 Running 1 12m
kube-controller-manager-master2 1/1 Running 0 12m
kube-proxy-c4x8j 1/1 Running 0 12m
kube-proxy-khh2z 1/1 Running 0 10m
kube-proxy-pckf7 1/1 Running 0 6m49s
kube-scheduler-master2 1/1 Running 0 12m
[root@master ~]#
[root@master ~]#
kubectl get node没有node节点
- 其他服务一切正常【见上面的服务】,就是没有master上发现node节点或缺失,如下
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready 16m v1.21.0
node1 Ready 2m19s v1.21.0
[root@master ~]#
- 解决方法
登陆到未发现的node节点,重启docker和kubelet服务,稍等一会回到master节点即可看到该节点信息了
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready 16m v1.21.0
node1 Ready 2m19s v1.21.0
[root@master ~]#
[root@master ~]# ssh node2
root@node2’s password:
Last login: Fri Jul 2 12:19:44 2021 from 192.168.59.1
[root@node2 ~]# systemctl restart docker
[root@node2 ~]# systemctl restart kubelet
[root@node2 ~]#
[root@node2 ~]# exit
logout
Connection to node2 closed.
[root@master ~]#
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready 20m v1.21.0
node1 Ready 7m5s v1.21.0
node2 NotReady 2s v1.21.0
[root@master ~]#
=====================================================================================
命令:kubectl config get-contexts
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
context master ccx default
-
context1 master1 ccx1 default
[root@master ~]#
-
命令解释
-
CURRENT
: * 在哪个上面表示当前所处哪个集群 -
NAME
:上下文名称 -
CLUSTER
:集群名称 -
AUTHINFO
:用户名称 -
NAMESPACE
:所处命名空间
-
命令:
kubectl config use-context 上下文名称
【kubectl config get-contexts
中NAME就是上下文名称】 -
如,我切换到context
*
所在位置就是 当前所属集群。
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
context master ccx default
-
context1 master1 ccx1 default
[root@master ~]#
[root@master ~]# kubectl config use-context context
Switched to context “context”.
[root@master ~]#
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
-
context master ccx default
context1 master1 ccx1 default
[root@master ~]#
-
命令:
kubectl config rename-context 现名称 新名称
-
如:我将context1修改为context1-new
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
-
context master ccx default
context1 master1 ccx1 default
[root@master ~]#
[root@master ~]# kubectl config rename-context context1 context1-new
Context “context1” renamed to “context1-new”.
[root@master ~]#
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
-
context master ccx default
context1-new master1 ccx1 default
[root@master ~]#
-
命令:
kubectl config set-context 自定义上下文名称
-
单纯的这么创建是没有任何意义的,因为没有指定集群没有指定用户,【需要结合下面的修改信息使用】
如,我创建一个my-context,查看的时候可以看到啥都没有
[root@master ~]# kubectl config set-context my-context
Context “my-context” created.
[root@master ~]#
[root@master ~]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
context master ccx default
-
context1 master1 ccx1 default
my-context
[root@master ~]#
- 如上,创建以后会在:
~/.kube/config
中生成一个context,但其他什么关键信息都没有,需要通过修改信息的方式,手动指定ns,user和name
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