-4

I use the default downloaded Ubuntu Docker image. I want to find the network interfaces and IP addresses in its container, so I would like to install the package containing ifconfig, but why do I fail? Thanks.

$ sudo docker run  ubuntu apt update

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:2 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [160 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:4 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages [5436 B]
Get:5 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [361 kB]
Get:6 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages [3910 B]
Get:8 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:9 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1344 kB]
Get:10 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [186 kB]
Get:11 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [11.3 MB]    
Get:12 http://archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages [13.5 kB]
Get:13 http://archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [10.8 kB]
Get:14 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [955 kB]
Get:15 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [725 kB]
Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [6968 B]
Get:17 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [3659 B]
Get:18 http://archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [942 B]
Fetched 15.6 MB in 27s (571 kB/s)
Reading package lists...
Building dependency tree...
Reading state information...
5 packages can be upgraded. Run 'apt list --upgradable' to see them.

and

$ sudo docker run  ubuntu apt upgrade

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

and

$ sudo docker run -it ubuntu  apt install net-tools
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package net-tools
  • you need to add package repository address in /etc/apt/sources.list file or /etc/apt/source.d folder for Ubuntu. – finn Mar 28 at 2:29
2

Each docker run command runs a separate container, so your commands’ effects don’t persist for the next docker run:

Run a process in a new container. docker run starts a process with its own file system, its own networking, and its own isolated process tree.

You need to combine all your commands:

docker run -it ubuntu /bin/sh -c 'apt update && apt upgrade -y && apt install -y net-tools'

adding any commands you want to run from net-tools.

It might be worth writing a Dockerfile instead.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.