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  • Linux command line best practices and tips?

    - by Maxim Veksler
    I would like to open a discussion that would accumulate your Linux command line (CLI) best practices and tips. I've searched for such a discussion to share the below comment but haven't found one, hence this post. I hope we all could learn from this. You are welcome to share your Bash tips, grep, sed, AWK, /proc and all other related Linux/Unix system administration, shell programming best practices for the benefit of us all.

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  • How can I uninstall my Huawei modem on Mac?

    - by Cawas
    I've installed many things trying to make this modem works, until I finally found something that should work on the official website. Now it isn't working, and I hope if I uninstall all other things and start a clean install again it will. I have no idea where and how it was installed, and I don't remember anymore where I got all stuff and even if I did, I don't think they came with any uninstall method. So, anyone could tell me how I can clean up all that?

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  • MySQL Execution Time Spikes

    - by Brett
    I am having issues with MySQL all of the sudden today. Details: OS: CentOS release 5.7 Server type: Parallels virtuozzo container running on mediatemple DV 4.0 package Average total memory usage: <500mb Total memory usage allowed: 1gb (part of shared pool for emergency only, users are only guaranteed 500mb) Processor: 1ghz Main database sizes with most usage: 275mb & 107mb server stack: nginx 1.0.10, mysql 5.1.54, php 5.3.8 with php-fpm innodb_buffer_pool_size=100M php-fpm max children: 5 Webapps: custom php-based sites, magento & drupal slow query timeout is set to 1 second Steps I completed towards diagnosis: Cannot restart container yet - I will try later tonight when our domestic traffic has dropped Enabled mysql and php-fpm slowlog. Found functions that did DB queries in php-fpm slowlog were taking over 1s to complete at times Found some simple queries in mysql slowlog taking well over 1s to complete that should take less than 1s. Most interesting - execution time seems to spike at times. A query will take .2s a couple times, then one time it will take 8s to run the same query. These results were verified by running raw SQL queries through mysql command line. Top does not reveal anything too interesting Only resource related thing i can see is load averages much higher than normal Up until today, mysql has been fine, there have been no major changes to the db since yesterday. Sometimes things are so bad, I am seeing bad gateway errors after 60s of execution time. Innodb is doing on average 300-1400 reads/sec. Mysql is doing 3-10 queries/sec slow query count in 2 hours uptime is 171 (with slow timeout at 1 second) Tried restarting mysql, nginx, php-fpm multiple times For example: UPDATE `catalogsearch_query` SET `query_text` = 'EW 90', `num_results` = '7532', `popularity` = '99180', `redirect` = NULL, `synonym_for` = NULL, `store_id` = '1', `display_in_terms` = '1', `is_active` = '1', `is_processed` = '1', `updated_at` = '2012-05-08 21:38:31' WHERE (query_id='31'); This query took 17sec to complete one time, rest of the time around .079 sec. But varies, sometimes 1sec, sometimes .004 sec. This is running the same query, over and over with a couple seconds time in between each. Most tables are innodb, and sometimes I noticed the lock time taking 90% of the query execution time, but most of the time lock time is insignificant. Any idea what's going on here?

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  • MacBook Air: USB Hub Compatible with the MBA SuperDrive

    - by _ande_turner_
    A little background to those whom may think this Question to specific: The MacBook Air SuperDrive draws 1A vs 500mA of a normal USB device, and therefore you can't use a standard USB hub powered or unpowered because each port gets 500mA not 1A... Have any MacBook Air users found a USB hub which can accommodate the MBA SuperDrive and another peripheral?

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  • Windows 7 fails to install on KVM with qemu

    - by kief_morris
    I'm trying to install Windows 7 on a virtual machine on my 64 bit Ubuntu Karmic box. I get to the point of selecting my language settings and clicking 'install now', but a short while later I get a blue screen of death. I've tried a few variations, including using the 32 bit (fails very quickly). The virt-install command I've tried includes this: sudo virt-install --connect qemu:///system -n ksm-win7 -r 2048 \ --disk path=/home/kief/VM-Images/ksm-win7.qcow2,size=50 \ -c /var/Software/Windows7/Full/64bit/SW_DVD5_SA_Win_Ent_7_64BIT_English_Full_MLF_X15-70749.ISO \ --vnc --os-type windows --os-variant vista --hvm The limited info I could find suggested that 'vista' should work as the --os-variant, I haven't found any values specific to windows 7. Here's my blue screen: I've found very little by Googling, so I'm guessing this isn't a case of KVM simply not supporting Windows 7. Thanks for any help. Update: I have been able to successfully create a Windows 7 VM using the graphical "Virtual Machine Manager" app, although I don't really understand the cause of the problem with the VM created with virt-install. Comparing the configuration files under /etc/libvirt/qemu provides some clues, although I don't know enough to interpret them properly. The interesting differences in the two VM configurations are: --- win7-virt-install.xml +++ win7-vmm.xml -<domain type='qemu'> +<domain type='kvm'> @@ -21 +21 @@ - <emulator>/usr/bin/qemu-system-x86_64</emulator> + <emulator>/usr/bin/kvm</emulator> @@ -23 +23 @@ - <source file='/home/kief/VM-Images/ksm-win7.qcow2'/> + <source file='/var/lib/libvirt/images/ksm-win7x64.img'/> I'm not sure if this means the working VM is not using qemu at all, or if there is some other difference in the way it's used with kvm. Update2: So I've answered my own question (mostly) below. A KVM VM needs to use KVM's own CPU emulation rather than qemu's in order for me to get Windows 7 installed. I'm not sure whether there is something that can be done to get it working on a qemu-emulation CPU, or whether a newer version will support it. But at least it is possible to get it running on a KVM VM.

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  • Non-Airport Express wirless N router with audio server

    - by iansinke
    I'm interested in hooking up three things to a wireless router: speakers, a printer, and a hard disk. At first the obvious solution was Airport Express, but then I found out that Airport Express does not support hard disks. Any ideas as to other wireless routers that would have the requisite feature set?

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  • Possible to direct naked domain to external IP

    - by Luke
    So I found this post: configure Bind to have a custom domain on tumblr and I was trying to ask a related question: Would it be possible to set up an A record pointing traffic to domain.com to Tumblr and feed.domain.com to the IP address of my choice? In other words, by setting up a naked domain A record to Tumblr's IP, will I inherently lose traffic to feed.domain.com? Can I write another A record for the specific subdomains I want to point to my server? I hope this makes sense.

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  • Unable to open an ra_local session to URL

    - by AntonAL
    I have repository on my Windows machine, using VisualSVN + TortoiseSVN I want to use this repositories on my Mac with Versions.app I create a new Repository bookmark, choose a repository directory and after clicking "Create", get following error: Unable to open an ra_local session to URL Unable to open repository 'file://localhost/Path/to/my/repositories/MyRepo' Expected FS format '2'; found format '4' I can surf through the repository, using svn ls file://localhost/Path/to/my/repositories/MyRepo Also, when i create local repository, using Versions.app, the bookmark is created well and i can work with it Help!

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  • Mac OS X keyboard shortcuts for terminal

    - by user10826
    After googling for some Mac OS X terminal shortcuts, I wanted to find how can I go back characters on a line on the terminal or words or similar. I found ALT + B but it does not work. Do you know some other shortcuts, or how can I customize them or links to cheat sheets?

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  • Mac OS X keyboard shortcuts for terminal

    - by user10826
    Hi, After googling for some Mac OS X terminal shortcuts, I wanted to find how can I go back characters on a line on the terminal or words or similar. I found ALT+B but it does not work. Do you know some other shortctus, or how can I customize them or links to cheat sheets? Thanks

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  • External hard drive FAT32 to NTFS conversion fails

    - by Pieter
    I'm trying to convert the FAT32 file system of an external hard drive to NTFS. Here's what happened: C:\Windows\system32>chkdsk G: The type of the file system is FAT32. Volume PIETEREXT created 3/19/2008 12:43 Volume Serial Number is 1806-2E30 Windows is verifying files and folders... File and folder verification is complete. Windows has scanned the file system and found no problems. No further action is required. 488,264,768 KB total disk space. 72,192 KB in 1,503 hidden files. 1,281,792 KB in 40,029 folders. 309,235,168 KB in 199,915 files. 177,675,584 KB are available. 32,768 bytes in each allocation unit. 15,258,274 total allocation units on disk. 5,552,362 allocation units available on disk. C:\Windows\system32>cd \ C:\>convert g: /fs:ntfs The type of the file system is FAT32. Enter current volume label for drive G: PIETEREXT Volume PIETEREXT created 3/19/2008 12:43 Volume Serial Number is 1806-2E30 Windows is verifying files and folders... File and folder verification is complete. Windows has scanned the file system and found no problems. No further action is required. 488,264,768 KB total disk space. 72,192 KB in 1,503 hidden files. 1,281,792 KB in 40,029 folders. 309,235,168 KB in 199,915 files. 177,675,584 KB are available. 32,768 bytes in each allocation unit. 15,258,274 total allocation units on disk. 5,552,362 allocation units available on disk. Determining disk space required for file system conversion... Total disk space: 488384001 KB Free space on volume: 177675584 KB Space required for conversion: 975155 KB Converting file system The conversion failed. G: was not converted to NTFS I looked at the TechNet page for my error, but after closing every app the conversion was still failing halfway through. Why does it keep failing? I kept an eye on Task Manager but it didn't look like my system resources were near depletion. I'm using Windows 8.

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  • How to identify heavy write to disk?

    - by Darth
    I have this problem with server running CakePHP application. The server is insanely slow, I first thought that it's application problem, but then I found constant 5-6MB/s write to disk. What is the easiest way to find cause of such a heavy write? The server is running Gentoo.

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  • Which static electricity prevention tools do actually work?

    - by Boris_yo
    I need a device that would discharge static electricity from my body in order to safely work with electronics. I have looked and found some that interested me, but I don't know whether they work: Anti-Static Wrist Strap Anti-Static Release Discharger Keychain Anti-Dissipative Wrist Strap Anti-Static Rubber Finger Stalls Which of above mentioned actually do something? Do I also need and anti-static screw box? It has holes that screws get put in. Will I need magnetic screwdriver to pull screws out?

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  • “X_FORWARDED_FOR” Header Doesn't Present In The Request

    - by Radi
    In my web application I need to extract the real ip address for clients behind proxy, after searching I found that the possible method to do that is to read the content of "X_FORWARDED_FOR" header , I am using java servlet and the headers of the incoming request doesn't contain "X_FORWARDED_FOR" header , So why the header doesn't included in the request? I am using java 1.7 , tomcat v7 , proxy server :TMG and configured to use "X_FORWARDED_FOR" header . Please advice. Thanks in advance.

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  • Protect apache2 server-status handler by password

    - by Shiplu
    In my apache2 server I access /server-status to check my current status of the web-server. I found that mods-available/status.conf contains the snippets that is responsible for showing status. <Location /server-status> SetHandler server-status Order deny,allow Deny from all Allow from localhost ip6-localhost </Location> My question is how can i make it available not only for localhost but also for remote host with authentication?

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  • Redirect local service to custom proxy

    - by Pedro Laguna
    Hello, I'm trying to create a custom proxy program but I have a problem. My program connects to a fixed port from a random port and I need to tunnel all this traffic by my local proxy. I think the solution is using iptables, but all the topics I found are related to redirect incoming connections, not outbounds. How can I redirect all the traffic from a local port to another local port and later to the internet? Thanks,

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  • Windows 7 - Minimize app to tray, restore from tray on hotkey

    - by barfoon
    Hey everyone, I'm looking for a utility for Windows that will, with a keyboard shortcut send an application to the system tray, and hitting the same keystroke (or even a different one) to restore it. This behavior is very similar to Apple + . when using Tweetie to show/hide the app in OS X. I know of applications like Tray it!, and Autohotkey, but I wanted to know if there was one that did it all. Does anyone have a solution for this that they have found?

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