1,357 reputation
179
bio website redhardsupra.blogspot.com
location Laurel, MD
age 37
visits member for 5 years, 2 months
seen 4 hours ago

2d
accepted Can ESXi pass video card to VM to do CUDA?
Jun
19
answered How can I disable encryption on openssh?
Jun
6
comment Allow SCP but not actual login using SSH
ForceCommand internal-sftp -u 0077 -d /uploaddir can farther harden it, by forcing a umask on an upload directory. In conjunction with 'ChrootDirectory` it creates a very controlled, isolated upload environment. Bonus note: the default dir and the umask must be set in the ForceCommand, not in the Subsystem directive, if you want them to work.
May
27
awarded  Yearling
Apr
28
revised Tail multiple remote files
typo
Feb
18
awarded  Custodian
Feb
18
reviewed Approve suggested edit on Tail multiple remote files
Jul
30
comment What is the maximum length of a wifi access point's SSID?
The question was about length, and length is irrelevant. The fact that it's not a default, especially in WPA where SSID is used as a salt, it needs to be as random as possible, so in that sense, changing it to something non-default is a good thing.
May
27
awarded  Yearling
May
23
comment Best way to go about changing a root password on 3000+ Solaris, AIX, and Linux servers?
Please do not put cleartext passwords on commandline, as it gets logged in shell history. Or set the shell history to /dev/null before you do it.
Apr
11
awarded  Notable Question
Jan
7
comment Very slow write performance on Debian 6.0 (AMD64) with DMCRYPT/LVM/RAID1
How does the write performance change when you mount it without sync?
Dec
20
comment Linux Experts Riddle: Network output of 10MB/s on 10GB/s NIC
When copying files over network pipes, turn off compression, copy a file from a ramdisk to another ramdisk, or something simpler, like stream reading /dev/zero, xfering it, and then dumping it out to /dev/null. When dd'ing, remember to play with block sizes and flags on BOTH sides (especially flags might not be symmetric!). When playing with qperf/iperf/netperf, make sure you're controlling window sizes and TCP congestion algorithms. Watch switch statistics. If not meaningful, connect two boxes directly, see if it changes anything. Install new drivers, especially Intel, both Win and LNX.
Oct
18
comment Is there a tool that can take partition table information and partition another based on it?
parted should do it. it can print out partitions in any unit you want, and then more invocations of parted would recreate it step by step.
Oct
10
comment Putting /etc under source control
etckeeper is awesome. Two gotchas tho: for backup, you end up pushing the repo somewhere remote. Please use key-based SSH for that, so it gets done securely. Also, what you store in /etc can be sensitive (think /etc/shadow or any private keys) so make sure that whereever you push the repo to does not have a 'public' webpage, or is being served out through any other unauthenticated means.
Sep
7
comment Linux software RAID that uses system RAM for write cache
Is it per data disk, or disks total? Since it's RAID5, you got N disks in array, but N-1 of data.
Sep
4
comment ksoftirqd hitting 100% on interface with ixgbe driver
Have you tried the newest drivers from Intel's site? I find them to solve a lot of problems, the drivers that come with distros tend to lag behind quite a bit, which causes issues with newer hardware.
Aug
22
comment How to copy a large LVM volume (14TB) from one server to another?
How does a tar pipe handle open/changing files, in comparison to let's say rsync? 14TB move is obviously not going to be an atomic operation ;)
Aug
15
revised Creating tmpfs file system in xen server to store VM
experiment added
Aug
15
answered Creating tmpfs file system in xen server to store VM