How to add ping package to container

[omersa...@gmail.com]

Hi,

I had build a cluster to two machines, one master and one minion. Now I had pulled two containers and are working fine. Now I accessed one container and tried to ping the other container IP but the ping command is not supported in the container. I want to add the ping into the container.

Kindly help me out

Regards,
Jason

[Timo Reimann]

If this is about validating accessibility in general, you could just replace your production container by one coming with ping pre-installed (like ubuntu), fire off your ping, and be good.

If you're okay with the ICMP flowing next to your production container, add that helper container as a sidecar.

Finally, if you really need to ping from the IP address of your production container, you'll have to make sure it exists inside the container one way or another. Either build a new image to add the tool, or (given your container is based off of some Linux distribution) execute apt-get or similar package management command to install ping directly inside the container. The latter will taint your container though until it dies.

These days, it's often easier to fire off an HTTP request (such as through curl), so maybe that's another option for you.

[Umar Saeed]

Thanks Timo. Your advice is very helpful. I used apt-get to add ping into my container and checked the reachability between my containers. 

The second option of using curl is also good. I used it to check the http accessability of my containers.

Thanks

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[Timo Reimann]

Glad I could help.