Docker FAQs - User Guide - 2 - Cortex XPANSE - Cortex - Security Operations

Cortex Xpanse Expander User Guide

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User Guide

Frequently asked questions (FAQ) about Docker installation, configuration, and security for Cortex Xpanse.

  • Does Cortex Xpanse use COPY or ADD for building images?

    Cortex Xpanse uses COPY for building images. The COPY instruction copies files from the local host machine to the container file system. Cortex Xpanse does not use the ADD instruction, which could potentially retrieve files from remote URLs and perform operations such as unpacking, introducing potential security vulnerabilities.

  • Should the --restart flag be used?

    The --restart flag should not be used. Cortex Xpanse manages the lifecycle of Docker images and restarts images as needed.

  • Can we restrict containers from acquiring additional privileges by setting the no-new-privileges option?

    Cortex Xpanse does not support the no-new-privileges option. Some integrations and scripts may need to change privileges when running as a non-root user (such as Ping).

  • Can we apply a daemon-wide custom seccomp profile?

    The default seccomp profile from Docker is strongly recommended. The default seccomp profile provides protection as well as wide application compatibility. While you can apply a custom seccomp profile, Cortex Xpanse cannot guarantee that it won't block system calls used by an integration or script. If you apply a custom seccomp profile, you need to verify and test the profile with any integrations or scripts you plan to use.

  • Can we use TLS authentication for docker daemon configuration?

    TLS authentication is not used, because Cortex Xpanse does not use docker remote connections. All communication is done via the local docker IPC socket.

  • Can we restrict Linux kernel capabilities within containers?

    The default Docker settings (recommended) include 14 kernel capabilities and exclude 23 kernel capabilities. Refer to Docker’s full list of runtime privileges and Linux capabilities.

    You can further exclude capabilities via advanced configuration, but will first need to verify that you are not using a script that requires the capability. For example, Ping requires NET_RAW capability.

  • Is the Docker health check option implemented at runtime?

    The Cortex Xpanse tenant monitors the health of the containers and restarts/terminates containers as needed. The Docker health check option is not needed.

  • Can we enable live restore?

    Live restore is not used. Cortex Xpanse uses ephemeral docker containers. Every running container is stateless by design.

  • Can we restrict network traffic between containers?

    Cortex Xpanse does not disable inter-container communication by default, as there are use cases where this might be needed. For example, a script communicating with a long running integration which listens on a port, may require inter-container communication. If inter-container communication is not required, it can be disabled by modifying the Docker daemon configuration.

  • Can we enable user namespace remapping?

    Cortex Xpanse does not support user namespace remapping.

  • How do we configure auditing for Docker files and directories?

    Auditing is an operating system configuration, and can be enabled in the operating system settings. Cortex Xpanse does not change the audit settings of the operating system.

  • Does Cortex Xpanse map privileged ports?

    Cortex Xpanse does not map privileged ports (TCP/IP port numbers below 1024).

  • Does Cortex Xpanse allow privileged execution?

    Cortex Xpanse does not allow privileged execution of Docker commands.

  • Does Cortex Xpanse run SSH within containers?

    Cortex Xpanse does not run SSH within containers.

  • Does Cortex Xpanse change the ownership of the socket?

    Cortex Xpanse does not change the ownership of the socket.

  • Can we disable the userland proxy?

    If the kernel supports hairpin NAT, you can disable docker userland proxy settings by modifying the Docker daemon configuration.

  • Does Cortex Xpanse support the AppArmor profile?

    Cortex Xpanse supports the default AppArmor profile (only relevant for Ubuntu with AppArmor enabled).

  • Does Cortex Xpanse support the SELinux profile?

    Cortex Xpanse supports the default SELinux profile (only relevant for RedHat/CentOS with SELinux enabled).

  • How does Cortex Xpanse handle secrets management?

    For Docker swarm services, a secret is a blob of data, such as password, SSH private keys, SSL certificates, or other piece of data that should not be transmitted over a network or stored unencrypted in a Docker file or in your application’s source code. Cortex Xpanse manages integration credentials internally. It also supports using an external credentials service such as CyberArk.