docker容器实例

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docker 常用命令
人生苦短我用python

docker 查看容器网络ip

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docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id

可直接获得容器的ip地址如：172.18.0.4

显示所有容器IP地址：
docker inspect --format='{{.Name}} - {{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps -aq)

判断是否工作在docker环境中

方法一：判断根目录下是否有.dockerenv

docker环境下有，非docker环境下没有

定制化的容器也可能没有这个文件

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ls -alh /.dockerenv 
-rwxr-xr-x 1 root root 0 Sep  6 07:09 /.dockerenv

方法二：查询系统进程的cgroup信息

docker 环境下：cat /proc/1/cgroup

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cat /proc/1/cgroup 
10:devices:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
9:perf_event:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
8:net_cls,net_prio:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
7:cpu,cpuacct:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
6:freezer:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
5:memory:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
4:cpuset:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
3:blkio:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
2:pids:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730
1:name=systemd:/docker/4cb54de415d470461a636d52a9a4f731eddbbcfdf80b4d0b46466ec1cf27f730

物理机cat /proc/1/cgroup

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cat /proc/1/cgroup 
10:cpuset:/
9:freezer:/
8:memory:/init.scope
7:perf_event:/
6:blkio:/init.scope
5:net_cls,net_prio:/
4:cpu,cpuacct:/init.scope
3:pids:/init.scope
2:devices:/init.scope
1:name=systemd:/init.scope

docker 导出镜像与导入镜像标签为none

docker导出镜像的方法
使用具体的镜像名称➕标签不建议使用镜像的id

正确： docker save : -o .tar
错误： docker save -o .tar

或者手动加入标签 docker tag :