Istio fails to deploy with restricted PodSecurityPolicy in Rancher v2.3 and v2.4
This document (000020148) is provided subject to the disclaimer at the end of this document.
Situation
Issue
Attempting to enable Istio in a Rancher v2.3 or v2.4 cluster, where the restricted PodSecurityPolicy (PSP) is configured on the cluster, fails with the istio-galley, istio-pilot, istio-policy, istio-sidecar-injector and istio-telemtry Deployments in a CrashLoopBackOff, with log messages of the formats below:
fatal validation admission webhook ListenAndServeTLS failed: listen tcp :443: bind: permission denied
or
nginx: [emerg] chown("/tmp/nginx", 101) failed (1: Operation not permitted)
In addition in namespaces with Istio sidecar auto injection enabled, an error of the following format will show for Pods upon scheduling:
Pods "nginx-7f4c54479d-" is forbidden: unable to validate against any pod security policy: [spec.initContainers[0].securityContext.capabilities.add: Invalid value: "NET_ADMIN": capability may not be added spec.initContainers[0].securityContext.capabilities.add: Invalid value: "NET_RAW": capability may not be added]
This is a result of the system capabilities required by the Istio system components (CHOWN
and NET_BIND_SERVICE
), as well as the Istio sidecar containers (NET_ADMIN
and NET_RAW
), in the default Istio configuration and which are blocked by the restricted PSP.
Pre-requisites
- Rancher v2.3.x or v2.4.x with a restricted PSP configured as the default and Istio enabled
Resolution
The steps to configure Istio in a cluster with restrictive Pod Security Policies enabled can be found in the Rancher documentation "Enable Istio with Pod Security Policies".
Futher Reading
Disclaimer
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- Document ID:000020148
- Creation Date: 06-May-2021
- Modified Date:06-May-2021
-
- SUSE Rancher
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