1.Error pushing to registry: Authentication is required
网上找了好多资料也没找到具体的解决办法比如这个
这个image是我从docker hub上pull下来的，是不是因为不是我的账号所在目录下的repository所以push不上去？
好吧，换种方法，先在本地commit生成一个新的镜像，
root@yadong-virtual-machine:/home/yadong# docker commit -m "v1.0" 41fab87c8bcf 843977358/centos7_java:9.14
2000e83cc6bc6128675e55aa7b66eaf56fa3f406107e09dc7408a6d8aacba60d
root@yadong-virtual-machine:/home/yadong# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
843977358/centos7_java 9.14 2000e83cc6bc 37 seconds ago 488.7 MB
nimmis/java-centos latest bc87ddb3fed1 7 days ago 391.7 MB然后push新生成的镜像
2.关于Commit 目录问题
You cannot push a "root" repository. Please rename your repository to <user>/<repo> (ex: <user>/centos)
docker commit提交的时候一定要用二级目录的形式，类似xxx/xxx而不能直接使用xxx，官方解释为：一级目录只能为Docker公司基础镜像存储，所有用户必须为二级目录
3.cp操作
root@yadong-virtual-machine:/home/yadong# cd yadongDir/
root@yadong-virtual-machine:/home/yadong/yadongDir# vi text.txt
root@yadong-virtual-machine:/home/yadong/yadongDir# ll
total 12
drwxr-xr-x 2 root root 4096 9月 23 14:18 ./
drwxr-xr-x 18 yadong yadong 4096 9月 23 14:17 ../
-rw-r--r-- 1 root root 10 9月 23 14:18 text.txt
root@yadong-virtual-machine:/home/yadong/yadongDir# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
80cd5dd784c1 e74 "nginx -g 'daemon of 25 minutes ago Up 24 minutes 0.0.0.0:32778->80/tcp kickass_carson
a7ba25dd1880 e07 "/bin/bash" 3 days ago Up 16 minutes 0.0.0.0:32779->22/tcp grave_bardeen
root@yadong-virtual-machine:/home/yadong/yadongDir# docker cp text.txt a7b:/yadong
Error: Path not specified看这儿网上用户说的cp只能由容器到宿主机，不能逆转
4.端口问题
之前已经执行过docker run -it -v /yadongDir:/var -p 80:80 e07 /bin/bash命令
再次使用相同端口进行映射时会出异常
root@yadong-virtual-machine:/home/yadong/yadongDir# docker run -it -v /yadongDir:/var -p 80:8080 e07 /bin/bash
Error response from daemon: Cannot start container c0a5a18a94d97cc2cc2bd7881dd63c47013d7d3d12a532a4ed1a5ec613d3cd59: Bind for 0.0.0.0:80 failed: port is already allocated