As of 2016-02-11, the following issues are critical known bugs about overlayfs in Linux kernel. (overlayfs) moving a file to a directory that exists only in `upper` and deleting it creates unnecessary whiteout file https://bugzilla.kernel.org/show_bug.cgi?id=109611 solution #1: “ovl: ignore lower entries when checking purity of non-directory entries” solution #2-1: “ovl: Do not leave whiteout during … [Read more…]
If a multipath-tcp-capable guest VM cannot communicate to the Internet, try to check the firewall on the host, # iptables -L FORWARD target prot opt source destination REJECT all — anywhere anywhere reject-with icmp-host-prohibited You need to allow packets with multipath TCP (TCP option 30). # iptables -D FORWARD -p all -j REJECT –reject-with icmp-host-prohibited … [Read more…]
It has been multiple weeks since I started running Fedora Linux on a new laptop, Dell XPS 15 9530. General hardware specification of the laptop is introduced on http://www.dell.com/us/business/p/xps-15-9530/pd?oc=&model_id=xps-15-9530&l=en&s=bsd. I wanted to install Fedora 22, removing the pre-installed Windows 10. After installing the distro, several issues popped up. * Wireless interface didn’t work. Chipset is … [Read more…]
After a visit to the talk about “containers and systemd” by Lennart Poettering, I just tried to set up several container setups using systemd-nspawn.
Last a month a blog post was published on a lengthy investigation on mysterious data corruption. Recently author of the article has updated with a core reason: a bug in MD-RAID 0/10/linear in Linux kernel. The author did made a contact with Samsung electronics, as he originally thought that its a firmware issue of Samsung … [Read more…]
I’ve written up a simple client for Seafile, based on FUSE-client under Linux. See https://github.com/dongsupark/seafile-fuse-client for details. To install it, do like the following: 1. Prequisites a. Install python-seafile. Python-seafile is needed as seafile-fuse-client depends on python API provided by seafile: $ git clone https://github.com/dongsupark/python-seafile.git $ cd python-seafile $ python setup.py install b. Install required … [Read more…]
[RFC PATCH 00/17] simplify block layer based on immutable biovecs https://lkml.org/lkml/2014/12/22/128 This is the first attempt of simplifying block layer based on immutable biovecs. Immutable biovecs, implemented by Kent Overstreet, have been available in mainline since v3.14. Its original goal was actually making generic_make_request() accept arbitrarily sized bios, and pushing the splitting down to the … [Read more…]