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Install legacy iptables binaries for Ubuntu/Debian (#18625) 

On the latest Debian 10, the `arptables-legacy` and `ebtables-legacy` binaries are not installed by default. Although the (non-legacy) versions are installed by default, it appears the respective packages that provide the legacy binaries must be installed in order to switch to the legacy alternatives. If you attempt to switch to the legacy alternatives without installing the `arptables` and `ebtables` packages, you will see an error:
```
update-alternatives: error: alternative /usr/sbin/arptables-legacy for arptables not registered; not setting
```

I have confirmed that the packages are present on Debian 10 and Ubuntu 19.10 and they provide the legacy alternatives. See:
* https://packages.ubuntu.com/eoan/amd64/iptables/filelist
* https://packages.ubuntu.com/eoan/amd64/arptables/filelist
* https://packages.ubuntu.com/eoan/amd64/ebtables/filelist
* https://packages.debian.org/buster/amd64/iptables/filelist
* https://packages.debian.org/buster/amd64/arptables/filelist
* https://packages.debian.org/buster/amd64/ebtables/filelist
This commit is contained in:
0xC45 2020-01-18 10:45:35 -07:00 committed by Kubernetes Prow Robot
parent 9bfc5d8966
commit b57509bbf6
1 changed files with 4 additions and 0 deletions
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4
content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md
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@ -66,6 +66,10 @@ switching to legacy mode, and is therefore incompatible with current kubeadm pac
{{< tabs name="iptables_legacy" >}}
{{% tab name="Debian or Ubuntu" %}}
```bash
# ensure legacy binaries are installed
sudo apt-get install -y iptables arptables ebtables
# switch to legacy versions
sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
sudo update-alternatives --set arptables /usr/sbin/arptables-legacy