Update the Docker images for the core components about faasd

[xinydev]

Hi, Alex , I want to know if we need to do these things for this issue

1. Save the log before upgrade
2. Upgrade the docker image verison in up.go , and update configuration items whitch have been introduced and fine-tune accordingly
3. Retest and make sure the faasd works as expected, save the log after upgrade

[alexellis]

That sounds fine to me, would you like to take this issue @Hsiny ?

[xinydev]

ok, I will do these work I listed and then create a PR

[alexellis]

Please bear in mind that there is a PR template to use, which has fields we would like to see filled in.

One other requirement is that for each commit you use git commit -s instead of just git commit. This adds your Signed-off-by line as described in the contributing guide.

Thanks

[xinydev]

@alexellis
Hi, Alex, I have created a PR about this Issue #74

[alexellis]

Thank you @Hsiny, I've merged that change but there is one piece that you may have missed.

Whoever makes this change should also look at what environment variables and configuration items have been introduced and fine-tune accordingly. For instance the queue-worker should now have max_inflight set to something like 5 to enable concurrency.

Could you cover this part?

The queue-worker should now have max_inflight set to something like 5 to enable concurrency.

[xinydev]

Hi , Alex , the max_flight for queue-worker is already set to 1, and I check this configuration item in other projects(faas-swarm,faas-netes), the default value is 1also.
Do I need to fine-tune this value? or just set the default value to 1 and let the user set it?

[alexellis]

I think we should set it to 5 for faasd since it can't be changed without rebuilding

[xinydev]

I'm sorry, I should have discussed it with you in advance.
Do I need to change it in another PR？

[alexellis]

Don't worry. Yes new PR please. I've merged your previous one.

[xinydev]

OK, PR is created, #75

[xinydev]

Thank you very much. If there is anything else like this, please contact me. I would like to make some open source contributions