How to install ifconfig command in my ubuntu docker image

Question

I ve just installed ubuntu docker image  when I execute  ifconfig  it says there s no such command  I tried apt-get install by there s no package named  ifconfig  I can install some other images    So how to do this  Thanks

User · Answer

If Ubuntu Docker image isn t recognizing  ifconfig  inside of GNS3  you ll need to open Ubuntu docker image on your host   Assuming you already have docker on your host pc and ubuntu pull d from docker images   Enter these commands in your host OS  Linux  CentOS  etc   CLI    docker images   docker run -it ubuntu   apt-get update   apt-get install net-tools    side note  you can add whatever other tools and services that you would like to add now  but for now this is just to get ifconfig to work     exit   Now you will commit these changes to Docker   This link for committing changes is the best summary and works  skip to Step 4    https   phoenixnap com kb how-to-commit-changes-to-docker-image htoc-step-3-modify-the-container  When you re-open the docker image in GNS3 you should now have the ifconfig command usable and whatever other tools or services you added to the container   Enjoy

User · Answer

sudo apt-get install iproute2 then run ip addr show   it works

User · Answer

You could also consider   RUN apt-get update  amp  amp  apt-get install -y iputils-ping    as Contango comments  you must first run apt-get update  to avoid error with missing repository    See  Replacing ifconfig with ip      it is most often recommended to move forward with the command that has replaced ifconfig  That command is ip  and it does a great job of stepping in for the out-of-date ifconfig    But as seen in  Getting a Docker container s IP address from the host   using docker inspect can be more useful depending on your use case

User · Answer

write   sudo apt-get install net-tools

User · Answer

From within a Dockerfile something like the following should do the trick    RUN apt-get update  amp  amp         apt-get install -y net-tools   From memory it s best practice to combine the update and the package installation lines to prevent docker caching the update step which can result in out-dated packages being installed    Installing it via the CLI or a shell script   apt-get update  amp  amp  apt-get install net-tools

User · Answer

Please use the below command to get the IP address of the running container     ip addr   Example-   root 4c712d05922b    ip addr 1  lo   lt LOOPBACK UP LOWER UP gt  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1     link loopback 00 00 00 00 00 00 brd 00 00 00 00 00 00     inet 127 0 0 1 8 scope host lo        valid lft forever preferred lft forever     inet6   1 128 scope host        valid lft forever preferred lft forever 247  eth0 if248   lt BROADCAST MULTICAST UP LOWER UP gt  mtu 1500 qdisc noqueue state UP group default     link ether 02 42 ac 11 00 06 brd ff ff ff ff ff ff link-netnsid 0     inet 172 17 0 6 16 scope global eth0        valid lft forever preferred lft forever     inet6 fe80  42 acff fe11 6 64 scope link        valid lft forever preferred lft forever

User · Answer

In case you want to use the Docker image as a  regular  Ubuntu installation  you can also run unminimize  This will install a lot more than ifconfig  so this might not be what you want

User · Answer

I came here because I was trying to use ifconfig on the container to find its IPAaddress and there was no ifconfig  If you really need ifconfig on the container go with  vishnu-narayanan answer above  however you may be able to get the information you need by using docker inspect on the host   docker inspect  lt containerid gt   There is lots of good stuff in the output including IPAddress of container    Networks          bridge              IPAMConfig   null           Links   null           Aliases   null           NetworkID    12345FAKEID            EndpointID    12345FAKEENDPOINTID            Gateway    172 17 0 1            IPAddress    172 17 0 3            IPPrefixLen   16           IPv6Gateway                GlobalIPv6Address                GlobalIPv6PrefixLen   0           MacAddress    01 02 03 04 05 06            DriverOpts   null

User · Answer

On a fresh ubuntu docker image  run  apt-get update apt-get install net-tools   These can be executed by logging into the docker container or add this to your dockerfile to build an image with the same

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