[fix] older versions of the ss command do not have the --no-header option #295
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Related to #226 and #214.
Solution: execute the
ss
command in a temporary container to precheck for ports in use instead.Side effects: the port precheck process will now take a bit longer, since we need to pull image, create a container, start the container, exec the
ss
command for each port, and then stop and remove the container.