84 lines
4.1 KiB
Markdown
84 lines
4.1 KiB
Markdown
kubezero-kiam
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=============
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KubeZero Umbrella Chart for Kiam
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Current chart version is `0.2.8`
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Source code can be found [here](https://kubezero.com)
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## Chart Requirements
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| Repository | Name | Version |
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|------------|------|---------|
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| https://uswitch.github.io/kiam-helm-charts/charts/ | kiam | 5.8.1 |
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| https://zero-down-time.github.io/kubezero/ | kubezero-lib | >= 0.1.3 |
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## KubeZero default configuration
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We run agents on the controllers as well, so we force eg. ebs csi controllers and others to assume roles etc.
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This means we need to run kiam containers on the controllers using `hostnetwork: true`.
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Therefore we also change the default port from 443 to 6444 to not collide with the potential api-server port on the controllers.
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Make sure any firewall rules between controllers and workers are adjusted accordingly.
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## Kiam Certificates
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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.
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[Kiam TLS Config](https://github.com/uswitch/kiam/blob/master/docs/TLS.md#cert-manager)
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[KubeZero cert-manager](../kubezero-cert-manager/README.md)
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## Metadata restrictions
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Some services require access to some basic AWS information. One example is the `aws-ebs-csi` controller.
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By default all access to the meta-data service is blocked, expect for:
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- `/latest/meta-data/instance-id`
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- `/latest/dynamic/instance-identity/document`
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## Chart Values
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| Key | Type | Default | Description |
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|-----|------|---------|-------------|
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| kiam.agent.gatewayTimeoutCreation | string | `"5s"` | |
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| kiam.agent.host.interface | string | `"cali+"` | |
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| kiam.agent.host.iptables | bool | `false` | |
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| kiam.agent.image.tag | string | `"v3.6"` | |
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| kiam.agent.log.level | string | `"warn"` | |
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| kiam.agent.prometheus.servicemonitor.enabled | bool | `false` | |
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| kiam.agent.prometheus.servicemonitor.labels.release | string | `"metrics"` | |
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| kiam.agent.sslCertHostPath | string | `"/etc/ssl/certs"` | |
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| kiam.agent.tlsCerts.caFileName | string | `"ca.crt"` | |
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| kiam.agent.tlsCerts.certFileName | string | `"tls.crt"` | |
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| kiam.agent.tlsCerts.keyFileName | string | `"tls.key"` | |
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| kiam.agent.tlsSecret | string | `"kiam-agent-tls"` | |
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| kiam.agent.tolerations[0].effect | string | `"NoSchedule"` | |
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| kiam.agent.tolerations[0].key | string | `"node-role.kubernetes.io/master"` | |
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| kiam.agent.updateStrategy | string | `"RollingUpdate"` | |
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| kiam.agent.whiteListRouteRegexp | string | `"^/latest/(meta-data/instance-id|dynamic)"` | |
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| kiam.server.assumeRoleArn | string | `""` | kiam server IAM role to assume, required as we run the agents next to the servers normally, eg. arn:aws:iam::123456789012:role/kiam-server-role |
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| kiam.server.deployment.enabled | bool | `true` | |
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| kiam.server.deployment.replicas | int | `1` | |
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| kiam.server.image.tag | string | `"v3.6"` | |
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| kiam.server.log.level | string | `"warn"` | |
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| kiam.server.nodeSelector."node-role.kubernetes.io/master" | string | `""` | |
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| kiam.server.prometheus.servicemonitor.enabled | bool | `false` | |
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| kiam.server.prometheus.servicemonitor.labels.release | string | `"metrics"` | |
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| kiam.server.service.port | int | `6444` | |
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| kiam.server.service.targetPort | int | `6444` | |
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| kiam.server.sslCertHostPath | string | `"/etc/ssl/certs"` | |
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| kiam.server.tlsCerts.caFileName | string | `"ca.crt"` | |
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| kiam.server.tlsCerts.certFileName | string | `"tls.crt"` | |
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| kiam.server.tlsCerts.keyFileName | string | `"tls.key"` | |
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| kiam.server.tlsSecret | string | `"kiam-server-tls"` | |
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| kiam.server.tolerations[0].effect | string | `"NoSchedule"` | |
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| kiam.server.tolerations[0].key | string | `"node-role.kubernetes.io/master"` | |
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| kiam.server.updateStrategy | string | `"RollingUpdate"` | |
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| kiam.server.useHostNetwork | bool | `true` | |
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## Debugging
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- Verify iptables rules on hosts to be set by the kiam agent:
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`iptables -L -t nat -n --line-numbers`
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`iptables -t nat -D PREROUTING <wrong rule>`
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## Resources
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- https://github.com/uswitch/kiam
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- https://www.bluematador.com/blog/iam-access-in-kubernetes-kube2iam-vs-kiam
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