Module nf_conntrack_ipv4 not found

[adamzhoul]

What happened:

use docker(kindest/node:v1.21.1) start by kind as edge node to join a superEdge k8s cluster
run: ./edgeadm join ...

1. get the error:
   E1117 14:39:31.802393 3427 init_node.go:47] Run init node shell: /tmp/edgeadm/edge-install/script/init-node.sh, error: exit status 126

2. add set -x to init-node.sh, rerun the script and get the output:

++ modprobe -- nf_conntrack_ipv4
modprobe: FATAL: Module nf_conntrack_ipv4 not found in directory /lib/modules/5.10.47-linuxkit

3. check the code and find: modprobe -- nf_conntrack_ipv4

The reason:

after some dig, and found out nf_conntrack_ipv4 is updated to nf_conntrack since the kernel 4.19
and only kube-proxy v1.13 is strong required this

and superEdge supported kube-proxy is higher than v1.13 (v1.18.2?)
so, can we remove this?

How to reproduce it (as minimally and precisely as possible):

1. kind create cluster (use config to create more than one worker node)
2. docker exec kind-worker, run ./edgeadm join

[adamzhoul]

by the way

when exec ./edgeadm join ... -v 6
got :

 stderr: /bin/bash: line 1: /tmp/edgeadm/edge-install/script/init-node.sh: Permission denied

check the permission:

ls -alh /tmp/edgeadm/edge-install/script/init-node.sh
-rwxr-xr-x 1 root root 2.9K Nov 17 15:10 /tmp/edgeadm/edge-install/script/init-node.sh

run findmnt command, and got a nonexec as expected.

findmnt --target /tmp/edgeadm/edge-install/script/init-node.sh
TARGET SOURCE FSTYPE OPTIONS
/tmp   tmpfs  tmpfs  rw,nosuid,nodev,noexec,relatime

so have to remount

mount -o remount,rw,nosuid,nodev,exec,relatime /tmp  

I don't know why kind does nonexec to /tmp dir.
But it may be under consideration when superEdge start to support kind.

[attlee-wang]

init-node.sh is a custom script, if some scripts are not suitable for your needs, you can customize
You can refer to: https://github.com/superedge/superedge/blob/main/docs/installation/install_edge_kubernetes.md#3-custom-node-initialization-script @caniszczyk adamzhoul

[adamzhoul]

thanks