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Update Troubleshooting docs for node operating system; fix script path #2132

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Nov 9, 2022
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Update Troubleshooting docs for node operating system; fix script path #2132

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15 changes: 15 additions & 0 deletions docs/troubleshooting.md
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Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,21 @@ cni v1.10.x introduced 2 new env variables - ENABLE_IPv4 and ENABLE_IPv6. The ab
kubectl apply -f https://raw.githubusercontent.com/aws/amazon-vpc-cni-k8s/release-1.10/config/master/aws-k8s-cni.yaml
```

## CNI Compatibility

The [CNI image](../scripts/dockerfiles/Dockerfile.release) built for the `aws-node` manifest uses Amazon Linux 2 as the base image. Support for other Linux distributions (custom AMIs) is best-effort. Known issues with other Linux distributions are captured here:

- **iptables** - iptables is installed by default in `aws-node` container images. Newer distributions of RHEL (RHEL 8.x+), Ubuntu (Ubuntu 20.x+), etc. have moved to using `nftables`. This leads to issues such as [this](https://github.com/aws/amazon-vpc-cni-k8s/issues/1847) when running IPAMD.

To resolve this issue on distributions that use `nftables`, there are currently two options:
1. Uninstall `nftables` and install `iptables-legacy` in base distribution
2. Build a custom CNI image based on `nftables`, such as:
```
from $ACCOUNT.dkr.ecr.$REGION.amazonaws.com/amazon-k8s-cni:$IMAGE_TAG
run yum install iptables-nft -y
run cd /usr/sbin && rm iptables && ln -s xtables-nft-multi iptables
```

## cni-metrics-helper

See the [cni-metrics-helper README](../cmd/cni-metrics-helper/README.md).
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2 changes: 1 addition & 1 deletion scripts/lib/canary.sh
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Expand Up @@ -16,7 +16,7 @@ fi

if [[ -z "${SKIP_MAKE_TEST_BINARIES}" ]]; then
echo "making ginkgo test binaries"
(cd $SCRIPT_DIR/../test && make build-test-binaries)
(cd $SCRIPT_DIR/../ && make build-test-binaries)
else
echo "skipping making ginkgo test binaries"
fi
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