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  • nf_conntrack complaints in dmesg

    - by Alexander Gladysh
    While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server: [11458852.811070] net_ratelimit: 321 callbacks suppressed [11458852.811075] nf_conntrack: table full, dropping packet. [11458852.819957] nf_conntrack: table full, dropping packet. [11458852.821083] nf_conntrack: table full, dropping packet. [11458852.822195] nf_conntrack: table full, dropping packet. [11458852.824987] nf_conntrack: table full, dropping packet. [11458852.825298] nf_conntrack: table full, dropping packet. [11458852.825891] nf_conntrack: table full, dropping packet. [11458852.826225] nf_conntrack: table full, dropping packet. [11458852.826234] nf_conntrack: table full, dropping packet. [11458852.826814] nf_conntrack: table full, dropping packet. Complains are repeated every five seconds (number of suppressed callbacks is different each time). What can these sympthoms mean? Is that bad? Any hints? (Note that the question is more narrow than "how to solve specific case of bad HTTP server performance", so I do not give more details on that.) Additional info: $ uname -a Linux MYHOST 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise $ cat /proc/sys/net/netfilter/nf_conntrack_max 1548576 The server is under about 10M hits / day load.

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  • Why is the usable memory on my Macbook pro shown as 2.74 Gb when there is 4GB installed with 32bit Windows 7? [closed]

    - by Bobby Alexander
    Possible Duplicate: Windows XP and RAM 3.5GB+ Installed RAM : 4 GB but 2.96GB Usable......why? I have a Macbook Pro with 4GB of installed RAM. I have installed Windows 7 on it which shows the usable memory as 2.74GB. Why is this? Don't tell me the 32 bit story; I program for a living. The maximum addressible memory on a 32 bit system is 4 GB not 3 GB. Need proof? MSDN: Memory Limits for Windows Releases

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  • PHP & IIS 6 Encoding problem

    - by Alexander
    The server is running Windows 2003 with IIS 6.0.3790.1830 x86 (iis.dll). My database server is Microsoft SQL Server 2000. My PHP version is 5.3. The original application is hosted on appserv1 and it's database is on dbserv1. It's working fine, everything is tuned up, running great. It was needed to place the same application (different modules) on another server, for other uses, so I copied the database on dbserv2, configured appserv2 to host the application, so I achieved 2 almost identical copies. Both dbserv1 and dbserv2 use the same encoding, both appserv1 and appserv2 are on IIS6 with the same PHP configurations. I also tried my best to have the same settings in the IIS. I also made sure that I pass the encoding information both in the HTTP headers and in the meta tags with http-equiv. Both applications use utf-8. The Problem is that the copy of the application doesn't display the non-ASCII characters normally in the browser, even if the browser detects correctly the UTF-8 encoding of the page. First I thought it was a database issue, given the fact that MSSQL 2000 doesn't support UTF-8, and instead it uses UCS-2, but when I redirected the application on appserv2 to work with the database on dbserv1, it had the same encoding problems. This is why I am asking in what way I can make it work. thank you for reading.

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  • Is this a graphics card failure?

    - by Alexander Lozada
    I own an older 32-bit Dell XPS 410 that I intended to use for gaming. Currently, I have a ATI Radeon 4000 series card installed, along with a Core 2 Duo and Ubuntu 12.10. I'm fairly certain that my problem is a GPU failure - but before I spend money on a new one, I want to make sure other components aren't the problem/if it would be cheaper just to buy a new PC. Here are my symptoms: Computer power button remains orange (usually green when successfully started.) A fan gets increasingly faster until powered off. Monitor remains black when started, receiving no signal. When powered on, the computer will power itself off near instantly, and then turn on again. If startup is successful, sometimes the screen will become jittered and unusable unless restarted. Is this just a GPU failure, or something more extensive like the motherboard?

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  • Redis 2.0.3 would not let go of deleted appendonly.aof file after BGREWRITEAOF

    - by Alexander Gladysh
    Ubuntu 10.04.2, Redis 2.0.3 (more details at the end of the question). My AOF file for Redis is getting too large, to the point where it soon would threaten to take whole free disk space on my small-HDD VPS box: $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda 32G 24G 6.7G 78% / $ ls -la total 3866688 drwxr-xr-x 2 redis redis 4096 2011-03-02 00:11 . drwxr-xr-x 29 root root 4096 2011-01-24 15:58 .. -rw-r----- 1 redis redis 3923246988 2011-03-02 00:14 appendonly.aof -rw-rw---- 1 redis redis 32356467 2011-03-02 00:11 dump.rdb When I run BGREWRITEAOF, the AOF file shrinks, but disk space is not freed: $ ls -la total 95440 drwxr-xr-x 2 redis redis 4096 2011-03-02 00:17 . drwxr-xr-x 29 root root 4096 2011-01-24 15:58 .. -rw-rw---- 1 redis redis 65137639 2011-03-02 00:17 appendonly.aof -rw-rw---- 1 redis redis 32476167 2011-03-02 00:17 dump.rdb $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda 32G 24G 6.7G 78% / Sure enough, Redis is still holding the deleted file: $ sudo lsof -p6916 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ... redis-ser 6916 redis 7r REG 202,0 3923957317 918129 /var/lib/redis/appendonly.aof (deleted) ... redis-ser 6916 redis 10w REG 202,0 66952615 917507 /var/lib/redis/appendonly.aof ... How can I workaround this issue? I can restart Redis this time, but I would really like to avoid doing this on a regular basis. Note that I can not upgrade to 2.2 (upgrade to 2.0.4 is feasible though). More information on my system: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.2 LTS Release: 10.04 Codename: lucid $ uname -a Linux my.box 2.6.32.16-linode28 #1 SMP Sun Jul 25 21:32:42 UTC 2010 i686 GNU/Linux $ redis-cli info redis_version:2.0.3 redis_git_sha1:00000000 redis_git_dirty:0 arch_bits:32 multiplexing_api:epoll process_id:6916 uptime_in_seconds:632728 uptime_in_days:7 connected_clients:2 connected_slaves:0 blocked_clients:0 used_memory:65714632 used_memory_human:62.67M changes_since_last_save:8398 bgsave_in_progress:0 last_save_time:1299014574 bgrewriteaof_in_progress:0 total_connections_received:17 total_commands_processed:55748609 expired_keys:0 hash_max_zipmap_entries:64 hash_max_zipmap_value:512 pubsub_channels:0 pubsub_patterns:0 vm_enabled:0 role:master db0:keys=1,expires=0 db1:keys=18,expires=0

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  • Is my Windows partition too far down on the disk?

    - by Trevor Alexander
    I have /boot/ on /dev/sda1 (1GB), followed by my Linux root LVM on /dev/sda2 (1.3GB). Finally, I installed Windows 7 on /dev/sda3 in the remaining 700GB of space. When I select Windows 7 in the grub menu, I get something like the following error and am thrown to grub4dos: find --set-root --ignore-floppies --ignore-cd /bootmgr Error 15: file not found Unable to locate necessary tables for adjustment. None of the options in grub4dos return anything but the above error. I heard that 1TB is the upper limit for locating Windows 7 partitions; is this true? How can I fix the above?

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  • Install php-fpm + php-mysql + MariaDB on Centos from repos

    - by Alexander
    I try to take CentOS 6.4 x64 and install nginx w/ php-fpm on it (and that's easy part, no problem at all), then add php-mysql package and MariaDB as a mysql drop-in replacement. And here I face the hang... I've added epel, nginx and remi repos, add priority=10 line to its .repo files, and now as I install MariaDB-server the dependency also brings me MariaDB's "common" package. Then, as I try to install php-mysql, I see file /usr/share/mysql/french/errmsg.sys from install of MariaDB-server-5.5.27-1.x86_64 conflicts with file from package mysql-libs-5.5.28-1.el6.remi.x86_64 warnings. If I deinstall MariaDB server, I'm able to install mysql-libs and php-mysql, but it won't allow me to install MariaDB later. Is there any way to escape that (infinite) loop? I believe the solution is simple but still can't see it. Please help to install php-fpm + php-mysql and MariaDB as DB server!

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  • Windows PowerShell ISE doesn't import PSCX 2.0 module

    - by Alexander
    Hi, i am using Powershell 2.0 with the PSCX 2.0 module. When writing PS scripts inside Windows PowerShell ISE no Cmdlets from the PSCX module are availible. For example running "Get-DriveInfo" from Windows PowerShell ISE would cause an error. Running "Get-DriveInfo" from Powershell works fine. I guess Windows PowerShell ISE doesn't load my PS profile (this would be mad). Does anyone know why and what to do to get it work?

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  • sharepoint list permissions

    - by Alexander Pavluchenko
    please help with following task: i have sharepoint list, all participants see only own records (they are can create, modify and read only own records), i need to give permissions for two users for editing each other records only, and not allow to see other users records. is ir possible to do with Sharepoint?

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  • Install .NET 3.5 SP1 on Windows 7 RC

    - by James Alexander
    While attempting to install .NET 3.5 SP1 on a fresh install of Windows 7 RC, nothing happens. The machine gives a UAC prompt. When selecting Yes, nothing happens. Using the full redistributable package gives the same result: nothing. Is there a reason why the .NET 3.5 SP1 installer would suddenly quit and not proceed with installation?

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  • s3fs: how to force remount on errors?

    - by Alexander Gladysh
    I use s3fs 1.33 on Ubuntu 9.10. Regularily it gives me errors like this: rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32) rsync: close failed on "/mnt/s3/mybucket/filename": Software caused connection abort (103) rsync error: error in file IO (code 11) at receiver.c(731) [receiver=3.0.6] rsync: connection unexpectedly closed (86 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at io.c(600) [sender=3.0.6] Any attempt to work with mounted directory after that gives this error: Transport endpoint is not connected To get rid of this, I have to remount. Is there a way to force a remount automatically?

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  • Can't create a valid symlink under VMWare HGFS

    - by Alexander Gladysh
    Host: OS X 10.6.5 VMWare Fusion: 3.1.2 Guest: Ubuntu x86 10.10 $ uname -a Linux ubuntu 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 GNU/Linux I can not create a symlink, readable from the Guest OS anywhere in the directory, mounted with hgfs: /mnt/hgfs/projects/tmp$ touch aaa /mnt/hgfs/projects/tmp$ ln -s aaa bbb /mnt/hgfs/projects/tmp$ less bbb bbb: No such file or directory /mnt/hgfs/projects/tmp$ ls -la total 6 drwxr-xr-x 1 501 users 136 2010-12-28 18:12 . drwxr-xr-x 1 501 users 8602 2010-12-28 18:12 .. -rw-r--r-- 1 501 users 0 2010-12-28 18:12 aaa lrwxr-xr-x 1 501 users 3 2010-12-28 18:12 bbb - aaa /mnt/hgfs/projects/tmp$ readlink bbb aaa The same symlink is perfectly accessible in OS X host. Is there a workaround for this?

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  • WSUS trying to download all updates again

    - by Tim Alexander
    The server hosting WSUS had a catastrophic failure and we have had to rebuild the system drives. Luckily the DB and content store for WSUS are on a seperate drive so were unaffected. During the rebuild process we thought it was time to update the server to 2008 R2 (from 2003 R2). Have got the server running and installed the WSUS role, detached the DB form SQL Express 2008 R2 and attached the original. Carried out the wsusutil.exe movecontent command with a -skipcopy switch pointing to the original content store. All looked good until I saw the front page stating it is trying to download files for 6,436 updates at around 344,565 MB!!!!!! Oops, I thought, something not right here. The content store I have on disk is only 75GB but I am thinking that some vital step has been missed in the restoration process. Either way is there a way to make WSUS reindex its local content store or something as I am unsure that downloading 344 gigabytes is a viable way forward! EDIT: Never rains but it pours. AM now getting a CLSID: FX {8b6499ed-0241-e032-6508-da4b1c879d7e} error could not create snap in. think a reinstall of WSUS is in order.

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  • Hotlinking images in Outlook emails

    - by Alexander Voglund
    I want to create an email with a signature that contains an external image. For example, I would like to always include my SuperUser flair in my signature like so: http://superuser.com/users/flair/53525.png This can be done if I insert an image and select the above source. The problem occurs when I copy the image and paste it into the body of a new email. Outlook creates an embedded version and breaks the link to the original email. How can an image be pasted into Outlook and NOT be embedded (ie: the link to the original image is maintained?)

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  • POST data not being received

    - by Alexander
    I've got an iPhone App that is supposed to send POST data to my server to register the device in a MySQL database so we can send notifications etc... to it. It sends it's unique identifier, device name, token, and a few other small things like passwords and usernames as a POST request to our server. The problem is that sometimes the server doesn't receive the data. And by this I mean, its not just receiving blank values for the POST inputs but, its not receiving ANY post data at all. I am logging all POST inputs to my server into some log files and when the script that relies on the POST data from the device fails (detects no data) I notice that its because NO POST data was sent. Is this a problem on the server, like refusing data or something or does this have to be on the client's side? What could be causing this?

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  • exchange user receive Undeliverable: form postmaster after every sended message

    - by Alexander Pavluchenko
    this happens after users mailbox moved from one exchange to other (in one organization, but differend domains) details: From: postmaster Sent: Saturday, April 03, 2010 8:43 AM To: USER1 Subject: Undeliverable: subject of message Delivery has failed to these recipients or distribution lists: IMCEAex-_O=DOMAIN_OU=First+20Administrative+20Group_cn=Recipients_cn=USER1@domain A problem occurred during the delivery of this message. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator.

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  • Configure Samba server via command line Linux CentOS

    - by Greg Alexander
    I am trying to get samba working on centOS... I installed it via Yum, changed the samba config file to: [ShareName] path = /var/www/html/ public = no writable = yes printable = no create mask = 0765 valid users = username Restarted samba and it did nothing.. the windows network is not seeing the share at all. I realize there is most likely something I am missing but I have always done it with the GUI, but unable to do that this time.. Any pointers?

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  • --prefix to /usr/local or /opt?

    - by Paul Alexander
    For building apps from source like git or rails I've seen recommendations to install in both /opt or /usr/local. From what I've read so for, the designated use for both is about the same and it amounts to merely a style issue. Is there any practical difference? Best practices?

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  • How do i make Mozilla Thunderbird opening attachments in appropriate application?

    - by Alexander Smirnov
    Hello, I'm using Kubuntu9.10 and Mozilla Thunderbird as email program. If email has an attachment, MT rarely finds required application to open it in. If i save an attachment and then open it from Dolphin, it works fine. But if i try opening it right from download dialog, MT can't determine appropriate application correctly. I'd prefer it to use xdg-open or kde-open programs for finding required application. Is there a way to make Thunderbird a bit smarter? thank you.

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  • Simple NNTP clent for Ubuntu

    - by Alexander Gladysh
    I need to download a particular NNTP group. I do not need to setup any crons, put group contents in /opt and other stuff. Just run <fetch-nntp> <server> <group-name> <output-dir> and be done with it without putting a lot of garbage in the system. If that <fetch-nntp> would not fetch the same messages on the second run — fine. But I can live without it. All NNTP clients that I've looked at are trying to be a NNTP server as well. Is there something simpler that is suitable for my needs?

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