README.md: Note userns unavailablity in CentOS 7 and Debian Jessie
Let's be more explicit that we can target production distributions today. Closes: #54 Approved by: rhatdan
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Colin Walters (automation)

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@@ -16,7 +16,9 @@ There is an effort in the Linux kernel called
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[user namespaces](https://www.google.com/search?q=user+namespaces+site%3Ahttps%3A%2F%2Flwn.net)
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which attempts to allow unprivileged users to use container features.
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While significant progress has been made, there are
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[still concerns](https://lwn.net/Articles/673597/) about it.
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[still concerns](https://lwn.net/Articles/673597/) about it, and
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it is not available to unprivileged users in several production distributions
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such as CentOS/Red Hat Enterprise Linux 7, Debian Jessie, etc.
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See for example
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[CVE-2016-3135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3135)
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