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• Mount Docker container contents in host file system

  - by dflemstr

  I want to be able to inspect the contents of a Docker container (read-only). An elegant way of doing this would be to mount the container's contents in a directory. I'm talking about mounting the contents of a container on the host, not about mounting a folder on the host inside a container. I can see that there are two storage drivers in Docker right now: aufs and btrfs. My own Docker install uses btrfs, and browsing to /var/lib/docker/btrfs/subvolumes shows me one directory per Docker container on the system. This is however an implementation detail of Docker and it feels wrong to mount --bind these directories somewhere else. Is there a proper way of doing this, or do I need to patch Docker to support these kinds of mounts?

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• cygwin rsync over ssh very slow

  - by Waleed Hamra

  I have 2 machines running Windows Xp SP3. I have cygwin installed on both, version 1.7. I have rsync and ssh installed on both, and configured using default settings as per ssh-host-config and ssh-user-config programs provided. I moved the public keys into their respective locations, and basically ssh is working fine. i began an rsync operation, using: rsync -av --delete --hard-links local_dir username@other_machine:/some_dir well... on both machines, the processor is running near idle, no heavy usage. I checked IO using process explorer on both machines, and that too is at normal levels (1~2 MB/s), so I can't see where the bottlenecks are, because network performance is aweful. I'm not going over 1MB/s... when a normal file copy using windows sharing achieves some ~10 MB/s.. What could be wrong?

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• Does a bad Internet connection increase bandwidth usage?

  - by Synetech

  My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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• Setup CENTOS Centralized AUDIT and RSYSLOG server

  - by Warron.French

  Attempting to use these links: Sending audit logs to SYSLOG server or http://wiki.rsyslog.com/index.php/Centralizing_the_audit_log I have been unable to get centralized AUDIT logging to work on my ALL-CentOS network environment. I have 6 workstations dt1...dt6, and the log files are not generated at all and I cannot tell if the messages are being sent from these workstations: dt1..dt6 over to the server (srv1). I have configured the rsyslog.conf on the workstations as shown in the link: Sending audit logs to SYSLOG server, and add the additional touches for generating the logfiles into a separate directory per YEAR/MONTH/DAY (using proper syntax) and into separate HOSTNAME-based_audit.log files. Note: RSYSLOG messaging does appear to work from the workstations over to the server, but the audit logging portion is not working. I am running CentOS-6.5 with RPMs: audit-2.2-4.el6_5.x86_64, audit-libs-2.2-4.el6_5.x86_64, and rsyslog-5.8.10-8.el6.x86_64 I have gotten zero responses from wiki.rsyslog.com and really need this to work. If needed I can send files of one of my workstations and the server to aid in the process. Thanks, Warron

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• restrict windows remote desktop

  - by radioactive21

  Is there any way to prevent users from launching and using remote desktop and to restrict it to only local admins or domain admins? The reason being is that we do not want users to remote desktop home, but at the same time we want it to be available to certain users like administrators or power users. Ideally there is a group policy that can be set to groups or users who have access to the remote desktop application from their machine. Clarifications: I need the machine to be able to still have remote desktop work, just only with a specific user or group. The point is that we allow certain users to use remote desktop and others to not have access to it. There are machines where there are multiple users, so we cant just block a whole machine or by IP. This needs to be done per a user account or login.

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• Advantages of a deployment tool over shell

  - by Jimmy

  Currently I have all of my deployment scripts in shell, which installs about 10 programs and configures them. The way I see it shell is a fantastic tool for this: Modular: Only one program per script, this way I can spread the programs across different servers Simple: Shell scripts are extremely simple and don't need any other software installed One-click: I only have to run the shell script once and everything is setup Agnostic: Most programmers can figure out shell, and don't need to know how to use a specific program. Versioning: Since my code is on github a simple git pull and restart all of supervisor will run my latest code. My question is, with all of these advantages, why is it people are constantly telling me to use a tool such as ansible or chef, and not to use shell.

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• On Windows 7, how do I fix my cmd.exe icon and remove cruft from the jumplist

  - by sb3700

  Hi. When installing drivers for my Gigabyte motherboard, I installed a "Games" link which ran from a batch file. This was pinned to the taskbar by default. As a result, it changed the icon for cmd.exe to the icon for Games. I uninstalled the Games and it got rid of the icon leaving it with a white rectangle thing (I can post screenshots on request). There is also a link on the jumplist to open Games, which just opens a cmd window. I've tried rebuilding my icon cache as per Changing Windows 7 pinned taskbar icons, but this only removed the white rectangle icon, leaving me with no real icon. c:\windows\system32\cmd.exe still has the appropriate icon in explorer, just not on the taskbar. Any ideas on how to fix this annoyance?

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• Extracting a line section of mysql backup using sed

  - by carpii

  I occasionally need to extract a single record from a mysqlbackup To do this, I first extract the single table I want from the backup... sed -n -e '/CREATE TABLE.*usertext/,/CREATE TABLE/p' 20120930_backup.sql > table.sql In table.sql, the records are batched using extended inserts (with maybe 100 records per insert before it creates a new line starting with INSERT INTO), so they look like... INSERT INTO usertext VALUES (1, field2 etc), (2, field2 etc), INSERT INTO usertext VALUES (101, field2 etc), (102, field2 etc), ... Im trying to extract record 239560 from this, using... sed -n -e '/(239560.*/,/)/p' table.sql > record.sql Ie.. start streaming when it finds 239560, and stop when it hits the closing bracket But this isnt working as I hoped, it just results in the full insert batch being output. Please can someone give me some pointers as to where Im going wrong? Would I be better off using awk for extracting segments of lines, and use sed for extracting lines within a file?

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• Determine Location of Inode Usage

  - by Dave Forgac

  I recently installed Munin on a development web server to keep track of system usage. I've noticted that the system's inode usage is climbing by about 7-8% per day even though the disk usage has barely increased at all. I'm guessing something is writing a ton of tiny files but I can't find what / where. I know how to find disk space usage but I can't seem to find a way to summarize inode usage. Is there a good way to determine inode usage by directory so I can locate the source of the usage?

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• Throttling apache downloads selectively

  - by Synchro

  I have a linux box running Debian Sarge (old I know) and apache 2.0.54. It serves two kinds of files - regular web pages and small images, and a lot of large podcast mp3s. The podcast downloads swamp the connection and make the rest of the site unresponsive, so I'm looking to throttle the data transfer rate (not the request rate) of just the podcasts. I've set up haproxy using this technique which does what it says it will, but solves a different problem - even only 5 simultaneous podcast downloads is enough to saturate the link. In a perfect world, haproxy would support per-connection throttling, but it doesn't. So far I've looked at mod_bw (won't compile for me, seems unsupported), mod_cband (unsupported, widely reported as problematic) and iptables using tc. The iptables approach would allow me to throttle things, but would not be at all selective, slowing down everything on the server, not just the podcasts, so would just move the bottleneck without changing overall behaviour. Ideas?

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• Streamline Active Directory account creation via automated web site

  - by SteveM82

  In my company we have high employee turnover, and hence our helpdesk receives about a dozen requests per week for new Active Directory accounts. Currently, we receive these requests simply via e-mail or voice-mail, and rarely do we have all of the information necessary to create the account. I would like to find a web application that can be used by a manager or supervisor to formalize the requests they make for AD accounts for new employees under their command. Ideally, the application would prompt for all of necessary information, and allow the helpdesk to review the requests and approve or deny each one. If approved, the application would take care of creating the account and send an e-mail to the manager. I have found several application on the Internet that handle self-service account management (i.e., password resets or update contact info), which is also nice to have, but nothing that streamlines the new account request and creation part. Can anyone make suggestions on such an application? Thanks.

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• How to decide the optimal number of ruby thin/mongrel instances for a server, number of cores?

  - by Amala

  We are trying to deploy mongrel instances on a machine. What is the optimal number of mongrel instances for a server? Since an instance can handle concurrent connections, I do not see any benefit in starting more than 1 per core. Any more than that and the threads will just fight for CPU. Our predecessors have assigned 10 instances for 4 cores, but I think it will just cause CPU contention. Any definitive answers / opinions? I have seen this question: How many mongrel instances? But it is really not specific enough.

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• Server suddenly running out of entropy

  - by Creshal

  Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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• Misbehaving Network Printers - options?

  - by Dan Kelly

  We are having some issue with printers on our network. We have 3 floors, 2 printers per floor (A3 & A4) all connected to the same Print Server. The issue is that the same printer may not behave the same on two different, seemingly identical desktops. The commonest place this is seen on our bulk print script in AutoCAD - occasionally drawings may print Landscape on Portrait paper, despite drawings always being Landscape... Does any one have any suggestions on what we can check / try? The current line of attack is to setup a new Print Server, with the HP universal print driver rather than the device specific drivers, and replace printers using exactly the same method on all desktops. Sound good?

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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• Parent control software for iPhone

  - by Fraser Orr

  My kids both have iPod Touches and I'd like to apply some parental controls. I have had a look and I know there are some really limited features on the phone itself, and a variety of filtered browsers. However, none of them are really hitting what I want. The features I am looking for are: Filtered web (as above) Filtered access to Youtube and music Control over how often they are allowed to play games (like 1 hour per day) Whitelist control over who they can skype (or maybe facetime, but I am an android user so can't hook that net.) Any suggestions?

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• Change Block Tracking settings not retained for a VM on VMWare 5.5

  - by Chris

  I'm trying to enable Change Block Tracking as per this VMWare KB article but the setting ctkEnabled is not being retained in the advanced options or being added to the vmx file. The setting scsi0:0.ctkEnabled is being retained and I see a file vmname-ctk.vmdk in the datastore. I've verified that the vm doesn't have any snapshots but don't see any other suggestions in the KB (or google, of course.) Edit: The last comment on this community post. It's a slightly different circumstance, but suggests that there is an known bug editing these settings in the web-gui.

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• Windows 7 - Remote Desktop - multiple credentials

  - by w-

  Hi, My home network consists of a couple XP machines and a windows 7 box. One of the XP boxes is like a shared server accessed via Remote Desktop. I have an account on there and my gf has another. Previously I was able to save RDC shortcuts to this shared server including credentials. So in order to access the server from a computer on the network, i just needed to open the shortcut. I thus would have two shortcuts, one for my account and one for my gf's. In windows 7, it seems to store credentials for a box based on machine name. i.e. i can only store one set of credentials per machine name. This seems incredibly stupid so my question is: In windows 7, is there some way to have RDC shortcuts that use different credentials to login to the same target box? thanks

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• Tracking costs within one AWS account

  - by caius howcroft

  I have what I'm sure is a very common problem. Our company has many projects and groups working for different clients. We do a lot of our development work in the cloud and deploy our solutions there. We have a VPC set up that isolates projects from each other in their own subnet and that VPC is getting a hardware VPN connection back to HQ. We need to keep track of the cost run up by every project. The way I currently implement this is by providing my own tools for starting and stopping instances which log which user (and thus which project) to bill the instance too. This works okay for BoxUsage costs but not for other costs. I could create a separate account for each project and use consolidated billing, this I think would allow me to pay once but track costs per "project", but I would then not be able to share common resources (like bring account B's running instances inside the same VPC). Does anyone have any suggestions? Cheers C

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• What is "queued Windows Error Reporting"?

  - by Rewinder

  I was cleaning up my laptop hard-disk, running Windows 7, and as part of the process I ran the Disk Cleanup utility. To my surprise I saw 2 items in the list that were quite large (both ~300MB). Per user queued Windows Error Reporting System queued Windows Error Reporting I guess I had never noticed these, because they were never that big. So, what are these items? Any particular reason why they became so large all of a sudden? And finally, is it safe to remove them?

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• How can I make a sub-domain point to a dynamic IP and the rest of the domain as it is hosted on a server with static IP?

  - by sleeping_dragon

  Basically, I have a domain mydomain.com hosted by a certain hosting company on its servers. I have access to the cpanel and can make changes a s per required. However, I want to host a dvr remote interface on one of its pages. The DVR is in my office which has a dynamic IP address. I first thought of using the numerous free DDNS services available. But then since I already own a domain name I thought of using that one. How do I do it?

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• How to route traffic through a VPN tunnel?

  - by Gabriel

  The problem with our server is that we need to use the bug ridden and awful AT&T network client, which causes our server to bluescreen once per 24 hours. Does any one know how to (or has a good guide) quickly set up a workstation running Windows server 2008 R2 as a proxy server. So this spare workstation would run AT&T and would act as a bridge between our server and the server that can be connected to only via the AT&T VPN software. And this way our own production server would not crash so often (or not at all) and the workstation can happily crash whenever it wants to.

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• How full is too full for mechanical hard drives?

  - by Sunny Molini

  I have heard many claim that it doesn't matter how full a drive is until it starts cutting into temp and virtual memory space. This doesn't make sense to me, given the nature of how the data is transacted on a hard drive. The inside of the platter presents less data per revolution than the outside of the drive does, by significant factors. The inside 40% of the radius of full size hard drive is used for the spindle, so only the outside 60% is used for data storage, but that still means that the inside track of a hard drive presents data 60% slower than the outside track. By my calculation, a Hard drive that is only 10% full should perform about 2.25 times faster than a hard drive that is 90% full, assuming that the flow is constrained by other factors. Am I wildly off base here? For all the drives I know, even the top speeds of the first 1% of the drive would be well within the bandwidth provided by a SATA 2 connection.

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• WinXP on VPC - Unable to change the way users log on or off

  - by kamleshrao

  On my Win7 computer, I have setup a new Win-XP VPC. In the VPC window, when I click Ctrl+Alt+Del, it shows me Windows Task Manager. As per MS KB [ http://support.microsoft.com/kb/281980 ], we can change this behavior to show the regular Windows Security window. But while making this change, I am getting the following error: User Accounts Fast User Switching cannot be turned off from a remote connection to this computer. Log on to the computer locally to turn off Fast User Switching. OK Is there any way I can fix this setting?

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