Install has fatal error on pi bramble

[illegitimate-egg]

When running main.yml, I receive a critical error on task TASK [geerlingguy.kubernetes : Join node to Kubernetes master]

The error looks like this:

fatal: [kube2]: FAILED! => changed=true 
  cmd: |-
    kubeadm join 192.168.1.51:6443 --token 8prjav.8s1ujy07uvgnqfo1     --discovery-token-ca-cert-hash sha256:726b2d09a6a656c7a6392b00cace5a3b8065556e9adefe1bcd2c564fa3999821
  delta: '0:00:01.282340'
  end: '2022-07-29 20:03:45.018586'
  msg: non-zero return code
  rc: 1
  start: '2022-07-29 20:03:43.736246'
  stderr: |2-
            [WARNING SystemVerification]: missing optional cgroups: hugetlb
    error execution phase preflight: [preflight] Some fatal errors occurred:
            [ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
            [ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
    [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
    To see the stack trace of this error execute with --v=5 or higher
  stderr_lines: <omitted>
  stdout: '[preflight] Running pre-flight checks'
  stdout_lines: <omitted>
fatal: [kube3]: FAILED! => changed=true 
  cmd: |-
    kubeadm join 192.168.1.51:6443 --token 8prjav.8s1ujy07uvgnqfo1     --discovery-token-ca-cert-hash sha256:726b2d09a6a656c7a6392b00cace5a3b8065556e9adefe1bcd2c564fa3999821
  delta: '0:00:02.114068'
  end: '2022-07-29 20:03:46.908983'
  msg: non-zero return code
  rc: 1
  start: '2022-07-29 20:03:44.794915'
  stderr: |2-
            [WARNING SystemVerification]: missing optional cgroups: hugetlb
    error execution phase preflight: [preflight] Some fatal errors occurred:
            [ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
            [ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
    [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
    To see the stack trace of this error execute with --v=5 or higher
  stderr_lines: <omitted>
  stdout: '[preflight] Running pre-flight checks'
  stdout_lines: <omitted>

and when ever I try to connect (locally or remotely) using kubectl I'm left with this error:

• Locally: The connection to the server localhost:8080 was refused - did you specify the right host or port?
• Remotely: The connection to the server 192.168.1.51:6443 was refused - did you specify the right host or port?

help?

[djvdorp]

@illegitimate-egg this helped for me:

ansible all -i inventory -m shell -a "modprobe br_netfilter" -b -B 60 -P 0

Before that, it gave this:

root@kube1:/home/pi# cat /proc/sys/net/bridge/bridge-nf-call-iptables
cat: /proc/sys/net/bridge/bridge-nf-call-iptables: No such file or directory

Afterward:

root@kube1:/home/pi# cat /proc/sys/net/bridge/bridge-nf-call-iptables
1

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