docker以root权限进入

docker exec -it -u root tomcat /bin/bash

tomcat是容器的名字，不是镜像的名字。

大部分docker环境下没有vim命令，但是可以自行安装，直接执行apt-get install vim，失败

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package vim

网上百度一番，说是要使用国内镜像，可是不管使用163还是清华的镜像，都报错

E: The repository 'http://mirrors.163.com/debian jessie-proposed-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.163.com/debian jessie Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7638D0442B90D010 NO_PUBKEY CBF8D6FD518E17E1

已尝试过多个debian版本的镜像，都是如此

索性尝试一下原始的source.list

直接执行

apt update

这次居然成功了。再执行

apt install -y vim

直接安装成功。

接下来可以安装ifconfig命令了

# net-tools提供ifconfig命令
apt-get install net-tools

安装ping命令

# iputils-ping提供ping命令
apt-get install iputils-ping