ingress controller support on s390x

[abhaysingh1722]

Is this a BUG REPORT or FEATURE REQUEST? (choose one): FEATURE REQUEST

NGINX Ingress controller version: 0.23.0

Kubernetes version (use kubectl version): 1.13.2

Environment:

• OS (e.g. from /etc/os-release): Ubuntu 16.04
• Kernel (e.g. uname -a): 4.4.0-142-generic

What happened:
This is about ingress controller support on s390x.
Earlier, s390x images were available till v0.20.0.
We have observed that support for s390x is stopped from v0.21.0. AFAK this could be due to following possible reasons:-

• Starting from v0.21.0 only the dynamic configuration mode will be available. Prior to that, dynamic configuration was optional.
• Also, it requires Luajit as mentioned here.
  Since Dynamic configuration requires LuaJIT, support for s390x was dropped.

Also, We came across this PR where it is mentioned that support for s390x can be added.

We are currently looking into luajit2 code to check if we can add support for s390x.

Could you please guide us on this?

[aledbf]

Could you please guide us on this?

Once you get luajit working you need to add a custom build adding some of the steps removed here https://github.com/kubernetes/ingress-nginx/pull/3214/files

Edit: after luajit maybe there are more things required to change. Maybe we will find something like #3852 (comment)

[abhaysingh1722]

We are currently looking into luajit2 code, if we can add support for s390x.

Also, as mentioned in this PR comment, we can provide s390x hardware.
Could you please let me know the hardware specifications: CPU(no. of cores), Memory, HD, Distribution(Ubuntu, RHEL etc.)

[aledbf]

Could you please let me know the hardware specifications: CPU(no. of cores), Memory, HD, Distribution(Ubuntu, RHEL etc.)

We don't need access to hardware to compile the ingress-nginx docker image. I think you should focus on getting luajit2 and building the docker image first.

Also, as mentioned in this PR comment, we can provide s390x hardware.

That is needed once the image is available, before that, makes no sense

[aledbf]

Closing. Please reopen when you have a working luajit2 (from the openresty repository)

[abhaysingh1722]

@aledbf The PR for adding s390x support on openresty/luajit2 has been merged.
I am now looking into the code for ingress-nginx to add support for s390x.

[aledbf]

@abhaysingh1722 sure but first we need to wait for an openresty release that includes that change in luajit2.

[aledbf]

@abhaysingh1722 experimental support for s390x was added in release 0.33.0.