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  • quick check of open port

    - by shantanuo
    The following is working as expected. (do not want to use nmap) I need to use nc (or any other built-in centOS) command in shell script to check the port 6379 of a remote server. I want the script to exit quickly if no response received in less than 1 second. But it seems that nc will wait for too long before quitting with exit code of 1 How do I "quickly" check if the port is listening? # time nc -z 1.2.3.4 1234 real 0m21.001s user 0m0.000s sys 0m0.000s # echo $? 1 # time nc -z 1.2.3.4 6379 Connection to 1.2.3.4 6379 port [tcp/*] succeeded! real 0m0.272s user 0m0.000s sys 0m0.008s # echo $? 0

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  • Load Testing Linux Virtual Server

    - by Anubhav Agarwal
    I have configured a Linux virtual network with following configuration 172.17.6.112- VIP 172.17.6.111- Linux Director | |----------172.17.6.113 --- Real Server 1 |----------172.17.6.114 --- Real Server 2 I am using direct routing technique. I am unable to test my LVS network. Are there some good scripts/softwares available for load testing. I am running apache2.0 service on them. I came across with testlvs on the internet but am unable to understand its documentation. Are there more simpler ones I want to test the response time of server using various scheduling algorithms .

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  • Lighttpd mod_rewrite conversion from .htaccess format

    - by hoball
    Hello, I am using lighttpd as webserver and is having an issue about mod_rewrite. Currently I have a set of Apache .htaccess rewrite rules from a PHP script: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-l RewriteRule ^(.*)$ index.php [QSA,L] In my understanding, if the requested URI is not a file/directory/sym-link, append it to index.php eg. www.a.com/hello/world --> www.a.com/index.php/hello/world I attempted to convert to lighttpd specification: url.rewrite-if-not-file = ( "^(.*)$" = "index.php/$1" ) However, it doesn't work. I suspect that is due to misuse of $1. I tried to use $0/%0 or something else but they fail. Would you please provide me a hint on making the syntax work? Thank you!

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  • Blocking IP's Nginx behind proxy

    - by FunkyChicken
    I'm running a Nginx 1.2.4 webserver here, and I'm behind a proxy of my hoster to prevent ddos attacks. The downside of being behind this proxy is that I need to get the REAL IP information from an extra header. In PHP it works great by doing $_SERVER[HTTP_X_REAL_IP] for example. Now before I was behind this proxy of my hoster I had a very effective way of blocking certain IP's by doing this: include /etc/nginx/block.conf and to allow/deny IP's there. But now due to the proxy, Nginx sees all traffic coming from 1 IP. Is there a way I can get Nginx to read the IP's like how PHP does, with the X-REAL-IP header?

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  • What's faster for web-server virtualization ? (virtualbox or KVM)

    - by marc
    I have question, does anyone try to set up a webserver (debian) using virtualbox (x64) ? Right now i have few servers in KVM (x64) but i think it work slowly... Can i get something more (faster, performance) using virtualbox (x64)? On my home installation it looks very fast. Should i move to vbox against kvm ? I'm looking for answer from someone who have in virtualbox (x64) real server (can be headless) (debian/ubuntu) not windows xp or other home using things ;) I also got xp, 2k3, ubuntu in virtualbox (x86) and for me looking faster than kvm(x64). But it's hard to say anything without real tests done by multiple users not just one.

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  • Why grep -i is so slow? How to do it faster for ASCII?

    - by Vi.
    $ time lzop -d < tvtropes-index.lzo | egrep -B 5 '[Dd][eE][sS][cC][eE][nN][dD] ?[Ff][rR][oO][mM]' real 0m0.438s $ time lzop -d < tvtropes-index.lzo | egrep -B 5 'descend ?from' -i real 0m11.294s Both search insensitively. why -i so slow? How to make fast grep -i without entering things [iI][nN] [tT][hH][iI][sS] [wW][aA][Yy]? For example, perl -ne 'print if /descend ?from/i' works fast, but '-B 5' is not as trivial to implement as in grep (as well as other options).

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  • What is a quick way to access chrome extensions?

    - by Edward Tanguay
    I'm trying to switch from Firefox to Chrome, so trying to get up to speed with the interface. I have installed some Chrome extensions such as World Clock. To access it I have to: click wrench click tools click extensions on world clock, click "options" click save" and then I can use it. What am I missing here, there must be an easier way. Is there a way to just click something and have all my extensions in a dropdown, i.e. in one click? I couldn't find this on a list of chrome hotkeys.

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  • Error in eclipse on run android project

    - by Larz
    I am trying to get a simple hello world android project working in eclipse using an android emulator. I have been using the examples on developer.android.com. I actually did have a hello world app working. I then modified it's xml files to have a text input field and a button as in the second example shows on that site. This failed to run on the emulator. I then went back and tried to create another simple hello world project, but it fails to run. The console says "Waiting for HOME ('android.process.acore') to be launched, but nothing happens or sometimes a messenger in the emulator says "unfortunately Android Wear has stopped". Below is a sample error filter on the log file. I find trying to debug this is something new to me and I am not sure the best way to go about it. I am just trying to learn some basic android developer skills. 05-30 16:19:07.336: E/SELinux(469): SELinux: Loaded file_contexts from /file_contexts, 05-30 16:19:07.336: E/SELinux(469): digest= 05-30 16:19:07.376: E/SELinux(469): b0 05-30 16:19:07.376: E/SELinux(469): 4b 05-30 16:19:07.756: E/SELinux(469): 03 05-30 16:19:07.756: E/SELinux(469): 4a 05-30 16:19:07.826: E/SELinux(469): 73 05-30 16:19:07.886: E/SELinux(469): ab 05-30 16:19:07.886: E/SELinux(469): 6d 05-30 16:19:07.896: E/SELinux(469): 46 05-30 16:19:07.896: E/SELinux(469): b4 05-30 16:19:07.896: E/SELinux(469): a5 05-30 16:19:07.896: E/SELinux(469): 73 05-30 16:19:07.896: E/SELinux(469): 8a 05-30 16:19:07.896: E/SELinux(469): ee 05-30 16:19:07.896: E/SELinux(469): ac 05-30 16:19:07.906: E/SELinux(469): 68 05-30 16:19:07.906: E/SELinux(469): ff 05-30 16:19:07.906: E/SELinux(469): 04 05-30 16:19:07.906: E/SELinux(469): dc 05-30 16:19:07.906: E/SELinux(469): b8 05-30 16:19:07.906: E/SELinux(469): a2 05-30 16:19:11.806: E/SensorManager(511): sensor or listener is null 05-30 16:19:16.196: E/BluetoothAdapter(378): Bluetooth binder is null 05-30 16:19:16.206: E/BluetoothAdapter(378): Bluetooth binder is null 05-30 16:19:17.186: E/WVMExtractor(54): Failed to open libwvm.so: dlopen failed: library "libwvm.so" not found 05-30 16:19:17.776: E/AudioCache(54): Error 1, -2147483648 occurred 05-30 16:19:17.796: E/SoundPool(378): Unable to load sample: (null) 05-30 16:19:18.536: E/AudioCache(54): Error 1, -2147483648 occurred 05-30 16:19:18.546: E/SoundPool(378): Unable to load sample: (null)

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  • Free / Cached / Available memory on Linux

    - by pkoraca
    I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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  • How to reach a Global Scope IPv6 host?

    - by Vaibhav Bajpai
    I have setup DNS64+NAT64 on a machine with 2 interfaces: eth0: public IPv4 address (connected to outside world) eth1: global scope IPv6 address: 2001::/64 I can successfully use ping6 google.com on this machine. Now I want to connect my MacBook to this machine by making it an IPv6-only client and perform some tests, but I do not have an IPv6 address assigned on this MacBook. I'm wondering, how should I manually assign one so as to route all my IPv6 traffic (I will disable IPv4 on my MacBook) to this machine, which will be picked up by DNS64+NAT64 to be converted to IPv4 requests and sent to the outside world?

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  • Samba file shares - ownership of folder accessible for 1 group verified by MS active direcctory

    - by jackweirdy
    I have a machine set up to share a folder /srv/sambashare, here's an exerpt of the config file: [share] path = /srv/sambashare writable = yes The permissions of that folder are set at 700 and it is owned by nobody:nogroup at the moment. The problem I face is probably a simple one but I'm fairly new to Samba so I'm not sure what to do. The contents of the share should be accessible to a particular user who will authenticate with domain credentials, checked against Active Directory by kerberos. I haven't got kerberos configured yet as I wanted to test the share as soon as samba was configured, albeit basically, to ensure that it works. I've noticed that I can only access & write to the share when the folder is either owned by the user logging in or made world writable. The key issues are that this folder can't be world writable as it contains sensitive stuff, but at the same time can't be owned by a user or group since they come from the AD server. Anyone know what I should do?

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  • Why no Win16 support in 64-bit Windows?

    - by dsimcha
    My understanding (from Wikipedia) is that the x64 instruction set supports executing 16-bit protected mode code from long mode, but cannot execute real mode code without being switched out of long mode because long mode lacks virtual 8086 mode. Therefore, it stands to reason that real mode DOS apps can't be run in Win64 w/o software emulation or dynamic translation. However, why was support for Win16 protected-mode apps excluded when support for them seems (at least at first glance) to be reasonably implementable and is included in newer versions of Win32? Was it just a matter of demand not being high enough to justify implementation costs (and the win32 version was already implemented), or is there a good technical reason?

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  • Configure PL2303-based USB-to-RS232 adapter to stay awake when no active device is present

    - by casualuser
    I am resurrecting some X10 devices with the aid of a USB-to-RS232 adapter. The problem is, that the adapter only works with the Firecracker device when there is another serial device on the line (the Firecracker is a pass-through device that monitors the RTS and DTR lines to do its magic). Is the PL2303 going to sleep without a real device on the line? Is there an option or command to keep it awake? Is there a cable configuration that would make it work without a real serial device present?

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  • Why is 'grep -i' so slow? How to do it faster for ASCII?

    - by Vi.
    Consider: $ time lzop -d < tvtropes-index.lzo | egrep -B 5 '[Dd][eE][sS][cC][eE][nN][dD] ?[Ff][rR][oO][mM]' real 0m0.438s $ time lzop -d < tvtropes-index.lzo | egrep -B 5 'descend ?from' -i real 0m11.294s Both search case insensitively. Why is the -i version so slow? How do I make grep -i fast without entering things like [iI][nN] [tT][hH][iI][sS] [wW][aA][Yy]? For example, perl -ne 'print if /descend ?from/i' works fast, but '-B 5' is not as trivial to implement as in grep (as well as other options).

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  • Ubuntu 9.10 Dowload Speed Very Slow

    - by Don
    I'm running Ubuntu 9.10 desktop and I'm new to the Linux world, so bear with me. I'm on a corporate network of 3 T1s shared across 50-60 users. I typically get about 300 KB/sec for downloads, but for whatever reason, the Linux box will start out in that range, then drop to less than 1KB/Sec sometimes. Doesn't seen to matter where I'm downloading from. Right now I'm trying to get Eclipse for PHP and it's running at 3-6KB/sec. Getting the updates for the system will also drop to very slow rates. Our IT person has set up the machine to get the same 10.0.0.x address when it starts, and moved this IP to bypass our Proxy/Firewall going out, so that shouldn't be the issue. Can anyone recommend something I can try to better diagnose the problem. Again, I'm new to the Linux world and the hardware/OS setup side in general (coming form more of a coding background). Thanks for any advice.

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  • PHP Zend Hash Vulnerability Exploitation Vector [closed]

    - by Resurrected Laplacian
    Possible Duplicate: CVE-2007-5416 PHP Zend Hash Vulnerability Exploitation Vector (Drupal) According to exploit-db, http://www.exploit-db.com/exploits/4510/, it says the following: Example: http://www.example.com/drupal/?_menu[callbacks][1][callback]=drupal_eval&_menu[items][][type]=-1&-312030023=1&q=1/ What are "[callbacks]","[1]" and all these stuffs? What should I put in to these stuffs? Can anyone present a real possible example? I wasn't asking for a real website; I was asking for a possible example! So, how would address be like - what should I put in to these stuffs, as the question says..

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  • Create and redirect subdomain for a parked domain?

    - by Steve
    I have a domain parked.com which is parked onto real.com. I have created the subdomain m.parked.com by editing parked.com's named file: m 14400 IN A ip-address www.m 14400 IN A ip-address This works somewhat: if I go to m.parked.com it redirects to http://m.parked.com/cgi-sys/defaultwebpage.cgi This is my question: I would like to redirect this subdomain to real.com as that is the domain it is parked on. I do not know how to do this as parked.com does not have its own .htaccess file, etc. (due to it being a parked domain) so I can't do any mod_rewrite magic. Can anyone help me? Thanks EDIT: Clarification

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  • DNS point to server on ISP and keep shared host too?

    - by Dwayne
    I know this is probably quite easy to do, but I might just have the right search sorted out... so here is the situation: We have example.com set up as a hosted server along with app1.example.com, app2.example.com and a few others. What I would like to do is set up the right zone file to also make our internal server addressable from the outside world as internalapp.example.com. This server sits behind a firewall (pfsense) and is hooked up to the world via a cable modem that is technically on DHCP from our ISP, but has had the same external IP for the past 15 months so far. What would be the best way to set this up?

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  • Uncorrectable machine check

    - by GregC
    I am experiencing rare but real unrecoverable machine checks on HP DL370 G6 dual-core Xeon server. I ran memtest86+ before, and ran CPU-intensive operations without any problems. In your opinion, does this indicate a real problem, or is it normal and expected behavior? How would you approach this problem? EDIT after some troubleshooting, it seems that these machine checks, as well as problems when showing device manager can be traced back to NC375i NICs. All is well when the NICs are not in the server. Further improvements to stability of HP Gen6 with Intel Xeon have been brought in with BIOS update in September 2013 HP Update DVD. Intel's newer microcode makes these CPUs much more stable. We haven't seen hardware-related BSODs since the update in September.

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  • An international mobile app - Should I set up EC2 instances in multiple regions?

    - by ashiina
    I am currently trying to launch an mobile app for users around the world. It is not a spectacular launch which will get millions of users in weeks - just another individual developer releasing an app. I know enough about the techniques of managing timezones, internationalizing string, and what not ( the application layer ). But I cannot find any information on how I should manage my EC2 instances... Should I be setting up EC2 instances in different regions around the world? Is that a must-do, or is it an overkill? I'm aware that it's the ideal solution in terms of performance, but it becomes very tough managing servers in multiple regions. DB issues, AMI management, etc... I'd much rather NOT do so. So I would like to know the general best practice when launching an international app/website. Note: For static contents, I know it's better to use a CDN, so I'm planning on doing so.

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  • Equalizer for Toshiba Satellite Pro Laptop (Windows 7) (has Realtek sound)

    - by Need Help
    Hi, I've been trying to find a way to have a real equalizer for my Toshiba Satellite Pro Laptop. I don't know much about computers but the guys in the store seem to know less than I do! From what I've been able to glean through friends, Windows 7 no longer supports a real equalizer function with Realtek, and the result is a fake "equalizer" that does nothing. I have hearing issues so not being able properly adjust the higher frequencies is causing me physical pain and ringing in my ears. I've tried to decipher the threads I find online but am quite confused by them. Basically I need an equalizer that will work with Windows 7 (with everything, internet, skype, music, etc). The current drivers offered by Realtek do nothing except make the sound inaudible. The one that may possibly work and provide an actual equalizer is a few versions back and can't be found anywhere. Thanks! And sorry if this is a duplicate question but I am confused a bit by the threads online.

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  • Arcemu Wow 3.3.5 sql error [on hold]

    - by user3691628
    I'm trying to set up a private arcemu 3.3.5 wow server to play with my 3 friends, but after I did all things great, I get this annoying error: [05-30-2014][15:14][Arcemu][2014-05-30 15:14:16] [05-30-2014][15:14][Arcemu]ArcEmu 4.0-TRUNK a816536/Debug-Win32-X86 :: World Server [05-30-2014][15:14][Arcemu]Sql query failed due to [Table 'logon.world_db_version' doesn't exist], Query: [SELECT LastUpdate FROM world_db_version;] [05-30-2014][15:14][Arcemu]Database: World database is missing the table `world_db_version` OR the table doesn't contain any rows. Can't validate database version. Exiting. [05-30-2014][15:14][Arcemu]Database: You may need to update your database Please help me guys, I really worked 4 hours to make this server good and now this error make me desperate... I tried to run the lattest update for world_db_version. Ask me if you need something else.

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  • Is there a difference in page fault rates between CPU bound and I/O bound processes?

    - by user198864
    I was thinking, should there be any difference in expectation of the page fault rate on CPU-bound vs I/O bound processes? At first I thought maybe we could, since CPU-bound processes would likely be using more memory accesses per time quantum, so I expect it would move from locality to locality faster. At the same time, the CPU-bound process is probably given a larger working set... but this doesn't affect the fault overhead as it hits a new locality IF this wasn't pre-paged in. Is there actually any real difference in the page fault rates or am I just musing about something nonexistent? And if there is, how would it impact a real-world OS like linux?

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  • xecvp: ./chk: Permission denied

    - by Hiranth
    I'm trying to install Xen 4.0.1 on Ubuntu 10.10. When i run the "make world" it gives the following error at the end.... make -C check clean make[4]: Entering directory `/home/hirantha/xen-4.0.1/tools/check' ./chk clean make[4]: execvp: ./chk: Permission denied make[4]: * [clean] Error 127 make[4]: Leaving directory `/home/hirantha/xen-4.0.1/tools/check' make[3]: * [subdir-clean-check] Error 2 make[3]: Leaving directory `/home/hirantha/xen-4.0.1/tools' make[2]: * [subdirs-clean] Error 2 make[2]: Leaving directory `/home/hirantha/xen-4.0.1/tools' make[1]: * [clean] Error 2 make[1]: Leaving directory `/home/hirantha/xen-4.0.1' make: * [world] Error 2 Why is that? Please help me to solve this....

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