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https://www.kernel.org/doc/html/latest/admin-guide/namespaces/compatibility-list.html
Namespaces compatibility list¶ This document contains the information about the problems user may have when creating tasks living in different namespaces. Here’s the summary. This matrix shows the known problems, that occur when tasks share some namespace (the columns) while living in different other namespaces (the rows):
https://stackoverflow.com/questions/39215025/how-to-check-if-linux-user-namespaces-are-supported-by-current-os-kernel
After doing some reading, I found that Linux user namespaces are generally supported in Linux versions >= 3.8. However, there's a possibility that user namespaces are disabled on a given OS, making the check for kernel versions unreliable.
https://www.kernel.org/doc/html/v5.4-preprc-cpu/admin-guide/namespaces/index.html
Kernel Support for miscellaneous (your favourite) Binary Formats v1.1; Mono(tm) Binary Kernel Support for Linux; Java(tm) Binary Kernel Support for Linux v1.03; Reliability, Availability and Serviceability; A block layer cache (bcache) The Linux RapidIO Subsystem; ... Namespaces ¶ Namespaces compatibility list ...
https://stackoverflow.com/questions/46207658/how-to-enable-linux-namespace-in-system-based-on-kernel-2-6-38-and-initd
How to enable Linux namespace in system based on kernel 2.6.38 and initd? Ask Question Asked 2 years, 2 months ago. ... LXC 2.0 on linux kernel 2.6.38 and init.d, whether both kernel version and initd are mandatory. I have recompiled the Kernel with namespace support as follow.
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/3/html/Installation_and_Configuration_Guide/sect-Common_Networking_Configuration.html
Red Hat Enterprise Linux OpenStack Platform includes a custom Red Hat Enterprise Linux kernel that supports the use of network namespaces. This kernel must be installed on nodes that will handle OpenStack networking traffic. Additionally the Open vSwitch plug-in will not work with kernels with versions lower than 2.6.32-343.el6.x86_64.
https://github.com/procszoo/procszoo/wiki/How-to-enable-%22user%22-namespace-in-RHEL7-and-CentOS7%3F
The "user" namespace support in RHEL7 is a technology preview feature. The docker has adopted it. The procszoo prefer the "user" namespace, too. Hence, how to enable it on RHEL7/CentOS7? A simple way is run following command by super user priveleges. grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
https://gist.github.com/dpneumo/279d6bc5dcbe5609cfcb8ec48499701a
Sep 11, 2019 · On CentOS 7.3 with Kernel Version: 3.10.0 1. Allow filesystem support for namespaces: xfs partition: format with ``` mkfs.xfs -m crc=1 -n ftype=1 ``` The current CentOS 7 does this by default.
https://en.wikipedia.org/wiki/Linux_namespaces
The Linux Namespaces originated in 2002 in the 2.4.19 kernel with work on the mount namespace kind. Additional namespaces were added beginning in 2006 and continuing into the future. Adequate containers support functionality was finished in kernel version 3.8 with the introduction of User namespaces. Namespace kindsLicense: GPL and LGPL
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