OpenShift

依照本指南对 OpenShift 集群进行配置以便安装运行 Istio。

缺省情况下，OpenShift 不允许容器使用 User ID（UID） 0 来运行。 下面的命令让 Istio 的 Service account 可以使用 UID 0 来运行容器：

$ oc adm policy add-scc-to-user anyuid -z istio-ingress-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z default -n istio-system
$ oc adm policy add-scc-to-user anyuid -z prometheus -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-egressgateway-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-citadel-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-ingressgateway-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-cleanup-old-ca-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-mixer-post-install-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-mixer-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-pilot-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-sidecar-injector-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-galley-service-account -n istio-system
$ oc adm policy add-scc-to-user anyuid -z istio-security-post-install-account -n istio-system

上面列出的 Service account 会分配给 Istio。如果要启动其它的 Istio 服务，例如 Grafana ，就需要使用类似命令来为其设置 Service account。

运行应用的 Service account 需要在安全上下文中具备一定特权，这也是 Sidecar 注入过程的一部分：

$ oc adm policy add-scc-to-user privileged -z default -n <target-namespace>