KubeZero/charts/kubezero-kiam

kubezero-kiam

KubeZero Umbrella Chart for Kiam

Current chart version is 0.1.1

Source code can be found here

Chart Requirements

Repository	Name	Version
https://uswitch.github.io/kiam-helm-charts/charts/	kiam	5.7.0

KubeZero default configuration

We run agents on the controllers as well, so we force eg. ebs csi controllers and others to assume roles etc. This means we need to run kiam containers on the controllers using hostnetwork: true. Therefore we also change the default port from 443 to 6444 to not collide with the potential api-server port on the controllers. Make sure any firewall rules between controllers and workers are adjusted accordingly.

Kiam Certificates

The required certificates for Kiam server and agents are provided by a local cert-manager, which is configured to have a cluster local self-signing CA as part of the KubeZero platform.
Kiam TLS Config
KubeZero cert-manager

Metadata restrictions

Required for the csi ebs plugin and most likely various others assuming basic AWS information.

• /latest/meta-data/instance-id
• /latest/dynamic/instance-identity/document

Chart Values

Key	Type	Default	Description
kiam.agent.host.iptables	bool	true
kiam.agent.log.level	string	"warn"
kiam.agent.prometheus.servicemonitor.enabled	bool	false
kiam.agent.sslCertHostPath	string	"/etc/ssl/certs"
kiam.agent.tlsSecret	string	"kiam-agent-tls"
kiam.agent.tolerations[0].effect	string	"NoSchedule"
kiam.agent.tolerations[0].key	string	"node-role.kubernetes.io/master"
kiam.agent.whiteListRouteRegexp	string	`"^/latest/(meta-data/instance-id	dynamic)"`
kiam.server.assumeRoleArn	string	"arn:aws:iam::123456789012:role/kiam-server-role"	kiam server IAM role to assume, required as we run the agents next to the servers normally
kiam.server.deployment.enabled	bool	true
kiam.server.deployment.replicas	int	1
kiam.server.log.level	string	"warn"
kiam.server.nodeSelector."node-role.kubernetes.io/master"	string	""
kiam.server.prometheus.servicemonitor.enabled	bool	false
kiam.server.service.port	int	6444
kiam.server.service.targetPort	int	6444
kiam.server.sslCertHostPath	string	"/etc/ssl/certs"
kiam.server.tlsSecret	string	"kiam-server-tls"
kiam.server.tolerations[0].effect	string	"NoSchedule"
kiam.server.tolerations[0].key	string	"node-role.kubernetes.io/master"
kiam.server.useHostNetwork	bool	true

Debugging

• Verify iptables rules on hosts to be set by the kiam agent:
  iptables -L -t nat -n --line-numbers
iptables -t nat -D PREROUTING <wrong rule>

Resources

• https://github.com/uswitch/kiam
• https://www.bluematador.com/blog/iam-access-in-kubernetes-kube2iam-vs-kiam

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Image Credits: Blue Matador, Inc.