Red Hat OpenShift Container Platform

Reference of security context constraints commands

You can manage security context constraints (SCCs) in your instance as normal API objects by using the OpenShift CLI (oc).

You must have cluster-admin privileges to manage SCCs.

Listing security context constraints

To get a current list of SCCs:

$ oc get scc

Example output

NAME                              PRIV    CAPS                   SELINUX     RUNASUSER          FSGROUP     SUPGROUP    PRIORITY     READONLYROOTFS   VOLUMES
anyuid                            false   <no value>             MustRunAs   RunAsAny           RunAsAny    RunAsAny    10           false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
hostaccess                        false   <no value>             MustRunAs   MustRunAsRange     MustRunAs   RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","hostPath","persistentVolumeClaim","projected","secret"]
hostmount-anyuid                  false   <no value>             MustRunAs   RunAsAny           RunAsAny    RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","hostPath","nfs","persistentVolumeClaim","projected","secret"]
hostnetwork                       false   <no value>             MustRunAs   MustRunAsRange     MustRunAs   MustRunAs   <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
hostnetwork-v2                    false   ["NET_BIND_SERVICE"]   MustRunAs   MustRunAsRange     MustRunAs   MustRunAs   <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
node-exporter                     true    <no value>             RunAsAny    RunAsAny           RunAsAny    RunAsAny    <no value>   false            ["*"]
nonroot                           false   <no value>             MustRunAs   MustRunAsNonRoot   RunAsAny    RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
nonroot-v2                        false   ["NET_BIND_SERVICE"]   MustRunAs   MustRunAsNonRoot   RunAsAny    RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
privileged                        true    ["*"]                  RunAsAny    RunAsAny           RunAsAny    RunAsAny    <no value>   false            ["*"]
restricted                        false   <no value>             MustRunAs   MustRunAsRange     MustRunAs   RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]
restricted-v2                     false   ["NET_BIND_SERVICE"]   MustRunAs   MustRunAsRange     MustRunAs   RunAsAny    <no value>   false            ["configMap","downwardAPI","emptyDir","persistentVolumeClaim","projected","secret"]

Examining security context constraints

You can view information about a particular SCC, including which users, service accounts, and groups the SCC is applied to.

For example, to examine the restricted SCC:

$ oc describe scc restricted

Example output

Name:                                  restricted
Priority:                              <none>
Access:
  Users:                               <none>
  Groups:                              <none>
Settings:
  Allow Privileged:                    false
  Allow Privilege Escalation:          true
  Default Add Capabilities:            <none>
  Required Drop Capabilities:          KILL,MKNOD,SETUID,SETGID
  Allowed Capabilities:                <none>
  Allowed Seccomp Profiles:            <none>
  Allowed Volume Types:                configMap,downwardAPI,emptyDir,persistentVolumeClaim,projected,secret
  Allowed Flexvolumes:                 <all>
  Allowed Unsafe Sysctls:              <none>
  Forbidden Sysctls:                   <none>
  Allow Host Network:                  false
  Allow Host Ports:                    false
  Allow Host PID:                      false
  Allow Host IPC:                      false
  Read Only Root Filesystem:           false
  Run As User Strategy: MustRunAsRange
    UID:                               <none>
    UID Range Min:                     <none>
    UID Range Max:                     <none>
  SELinux Context Strategy: MustRunAs
    User:                              <none>
    Role:                              <none>
    Type:                              <none>
    Level:                             <none>
  FSGroup Strategy: MustRunAs
    Ranges:                            <none>
  Supplemental Groups Strategy: RunAsAny
    Ranges:                            <none>

where
Users: Lists which users and service accounts the SCC is applied to.
Groups: Lists which groups the SCC is applied to.

To preserve customized SCCs during upgrades, do not edit settings on the default SCCs.

Updating security context constraints

If your custom SCC no longer satisfies your application workloads requirements, you can update your SCC by using the OpenShift CLI (oc).

To update an existing SCC:

$ oc edit scc <scc_name>

To preserve customized SCCs during upgrades, do not edit settings on the default SCCs.

Deleting security context constraints

If you no longer require your custom SCC, you can delete the SCC by using the OpenShift CLI (oc).

To delete an SCC:

$ oc delete scc <scc_name>

Do not delete default SCCs. If you delete a default SCC, it is regenerated by the Cluster Version Operator.