Table of contents
Cannot find sudo on the container
If you try to run the sudo command and you get an error message telling you the sudo cannot be found, your docker service might be running on a cached stale version of the class container.
To fix this, you will need to remove the container image to the most up to date one can be re-downloaded. First, check out which images you have by issuing the following command on your virtual machine:
docker image ls
Mine looks like the following:
REPOSITORY TAG IMAGE ID CREATED SIZE
netsos/rhit-netsec latest eb20fb69f1db 7 days ago 1.37GB
netsos/rhit-netsec <none> 0f6dc5fc9299 8 days ago 1.37GB
netsos/rhit-netsec <none> 2bb2197881ab 8 days ago 1.36GB
kalilinux/kali-rolling latest 9fbb6aad6757 10 days ago 129MB
openvpn/openvpn-as latest 7268bba0967e 8 months ago 674MB
p4lang/p4c latest 4a81a016ebb4 10 months ago 1.77GB
netsos/rhit-netsec fw b559df8e262f 10 months ago 976MB
netsos/rhit-netsec base aacc8a3a9a4b 10 months ago 927MB
netsos/rhit-netsec tcplab cf08e1097c02 11 months ago 1.56GB
netsos/rhit-netsec <none> f8e3d779c096 11 months ago 1.54GB
hello-world latest d2c94e258dcb 19 months ago 13.3kB
linuxserver/openvpn-as latest 7a4f12e2c18d 3 years ago 228MB
ghcr.io/linuxserver/openvpn-as latest 7a4f12e2c18d 3 years ago 228MB
The one that matters the most here is the following:
netsos/rhit-netsec latest eb20fb69f1db 7 days ago 1.37GB
So now you can delete this image as follows:
docker image rm netsos/rhit-netsec:latest
Note that you can use the <tab> key to have your shell autocomplete the name of the container image for you.
If you get an error message telling you that the image is in use, then you have one or more container dangling from one of your experiments. Please bring those down by navigating to that lab’s directory and running dcdn in there.