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add iptables rules to enforce access to kubelet and nodeports #1779

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add iptables rules to enforce access to kubelet and nodeports #1779

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91fa6ad
add iptables rules to enforce access to kubelet and nodeports
varun-armis May 1, 2024
97fe8b2
iptables forward accept rule not needed in kubelet.service
varun-armis May 1, 2024
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14 changes: 14 additions & 0 deletions templates/al2/provisioners/install-worker.sh
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Expand Up @@ -104,6 +104,20 @@ sudo systemctl restart sshd.service
### iptables ###################################################################
################################################################################

# open access to kubelet
iptables -A INPUT -p tcp -m tcp --dport 10250 -m state --state NEW -j ACCEPT

# open access for NodePorts
iptables -A INPUT -p tcp -m multiport --dports 30000:32767 -j ACCEPT

# open input, output and forward by default
iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT

# save updated iptables
bash -c "/sbin/iptables-save > /etc/sysconfig/iptables"

sudo mv $WORKING_DIR/iptables-restore.service /etc/eks/iptables-restore.service

################################################################################
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1 change: 0 additions & 1 deletion templates/al2/runtime/kubelet.service
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Expand Up @@ -5,7 +5,6 @@ After=docker.service iptables-restore.service
Requires=docker.service

[Service]
ExecStartPre=/sbin/iptables -P FORWARD ACCEPT -w 5
ExecStart=/usr/bin/kubelet \
--config /etc/kubernetes/kubelet/kubelet-config.json \
--kubeconfig /var/lib/kubelet/kubeconfig \
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