一、K8S证书（No resources found.）

证书有效期，突然没有找到任何资源。

报错信息：kubectl get csr

No resources found.

报错分析

master端接收不到node申请加入kubernetes的请求信息

问题解决

通过查看日志文件发现是kubelet没有启动成功，筛选kubelet发现没有kubelet命令选项，从 master节点将kubelet命令拷贝到node节点下，再次重启 kubelet发现问题得到解决

二、k8s:kubeadm部署pods急退

报错信息：CrashLoopBackOff

报错分析：查看kube-flannel.yml文件

cd /opt/
vim kubeadm-config.yaml

忘记修改版本了，导致服务没起来

三、Git无法执行“快速合并”

[root@qfedu.com ~]# git add readme.txt 
[root@qfedu.com ~]# git commit -m "& simple"
git merge feature1 Auto-merging readme.txt CONFLICT (content): 
Merge conflict in readme.txt Automatic merge failed; 
fix conflicts and then commit the result.

[root@qfedu.com ~]# git status 可以显示冲突的文件;
直接查看readme.txt的内容：
Git is a distributed version control system.
Git is free software distributed under the GPL. 
Git has a mutable index called stage. 
Git tracks changes of files. 
<<<<<<< HEAD Creating a new branch is quick & simple. ======= Creating a new branch is quick AND simple. >>>>>>> feature1
Git用<<<<<<<，=======，>>>>>>>标记出不同分支的内容，我们修改后保存再提交：
[root@qfedu.com ~]# git add readme.txt  
[root@qfedu.com ~]# git commit -m "conflict fixed" 
[master 59bc1cb] conflict fixed
最后，删除feature1分支：
[root@qfedu.com ~]# git branch -d feature1 
Deleted branch feature1 (was 75a857c).

四、配置ssl证书报错

#问题
The mandatory countryName field was missing

#解决办法
修改openssl配置文件   /etc/pki/tls/openssl.cnf

[ policy_match ]
countryName             = optional
stateOrProvinceName     = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

#问题
Using configuration from /etc/pki/tls/openssl.cnf
Enter pass phrase for ca-key.pem:
ca: ./demoCA/newcerts is not a directory
./demoCA/newcerts: No such file or directory

#解决办法
[root@localhost ca]# mkdir -p ./demoCA/newcerts
[root@localhost ca]# touch  demoCA/index.txt
[root@localhost ca]# touch demoCA/serial
[root@localhost ca]# echo  '01'>demoCA/serial