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  • Autossh dies after time

    - by Justin
    My setup is Ubuntu 10.04 on AWS Autossh to create a tunnel for MySQL The tunnel is automatically created using Upstart (/etc/init/autossh.conf): respawn console none start on (local-filesystems and net-device-up IFACE=eth0) stop on [!12345] script #user/IP Address redacted exec autossh -M 20000 -o StrictHostKeyChecking=no -L 3306:127.0.0.1:3306 [email protected] end script On boot the tunnel is created, works great. After some random idle time it dies. Any thoughts on how to keep it alive? I don't know what's killing autossh.

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  • Campus Network Design - Firewalls

    - by user3081239
    I am designing a campus network, and the design looks like this: LINX is The London Internet Exchange and JANET is Joint Academic Network. My goal is an almost-fully redundant with high availability, because it will have to support about 15k people, including academic staff, administrative staff and students. I have read some documents in the process , but I am still not sure about some aspects. I want to dedicate this one to firewalls: what are the driving factors in deciding to employ a dedicated firewall, instead of an embedded firewall in the border router? From what I can see, an embedded firewall has these advantages: Easier to maintain Better integration One less hop Less space requirement Cheaper Dedicated firewall has the advantage of being modular. Is there anything else? What am I missing?

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  • GlusterFS vs Ceph, which is better for production use for the moment?

    - by Mickey Shine
    I am evaluating GlusterFS and Ceph, seems Gluster is FUSE based which means it may be not as fast as Ceph. But looks like Gluster got a very friendly control panel and is ease to use. Ceph was merged into linux kernel a few days ago and this indicates that it has much more potential energy and may be a good choice in the future. I am wondering which(even out of the two?) is a better choice for production use? It would be nice if you could share your practical experiences

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  • Request time out error

    - by Neo
    Hi Today i came across strange problem whenever i try to pinging to my server works properly but whenever i send http request from browser the request time out happens. can anybody help me to resolve this issue.

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  • Lighttpd getting 403 forbidden page

    - by Ramesh
    i have newly installed lighttpd in ubuntu 9.10 first it showed the detault page and i changed the permission of /var/www/ directory to 777 and now its saying 404 forbidden my php-cgi -v PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cgi-fcgi) (built: Jan 6 2010 22:34:28) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies php -v PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cli) (built: J 6) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies and i have added these line in lighttpd.conf file fastcgi.server = ( ".php" = (( "bin-path" = "/usr/bin/php-cgi", "socket" = "/tmp/php.socket" ))) still getting same error....

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  • Many Stack Overflow users' pages have no Google PageRank and they are not indexed, why?

    - by Marco Demaio
    If you go to my user page on Stack Overflow and you check it with the Google Toolbar, you can see it has no PageRank at all (this does happen for almost any user page, even people with much higher reputation, the only exceptions seem to be the users in page 1, and some other users they have PR). My user page's Page Rank is not only zero, but not calculated at all. When PR is 0 or less than 1, but calculated the Google bar shows white, but when the PR is not even calculated like in my user page the Google bar shows in grey. I further more discovered that my user page is NOT EVEN INDEXED on Google, simple test is searching on Google for the exact page url: "http://stackoverflow.com/users/260080/marco-demaio" and you will see no result. The question is how can this be??? This is really weird to me because of the following reason: If you search on Google for "Marco Demaio" on Stack Overflow only (you can do this by searching "site:stackoverflow.com Marco Demaio") the search result shows hundreds of 'asking/answering questions' pages where I was 'tagged'!!! Let's check one of these: the 1st one that appears now (shows one of the question I asked). We can be sure this page is indexed in Google because comes out in a search. Moreover, its PR is calculated. It's probably nearly zero. Still, some PR flows there, the PR bar is not grey, but white: The page shown above has got links to my own user page. I checked the source code of the page shown above and the links are not hidden or set with a rel="nofollow", moreover I can't see any meta character excluding the links on the page from being followed. So what's happening? Why Google does not see my user page at all. Did Stack Overflow do something to achieve this? If yes what did they do? Any explanation really appreciates (as always). P.S. obviously I checked also the code of my user page, but I could not find meta tags excluding Google search for the page. P.S. 2 in a desperate adventure I also checked Stack Overflow's robots.txt but it does not seem to exclude user pages. UPDATE 1 following up on some answers, I did some more research. Excluding for a while the PR problem (since PR is not science), and looking only at the user page on Stack Overflow NOT BEING INDEXED problem: pages do not seem to be indexed by Google because of the user reputation, this user for instance has got NOW 200 points less reputation than me and his page is indexed (while mine not). It does not seem even to be connected with months you have been on Stack Overflow, this user (almost my same reputation) has been there for 3 months only and his page is indexed (while mine not and I have been a user for 7 months). It's bizarre! UPDATE February/2011 As of today, the page got indexed by Google at least when you search for "site:stackoverflow.com Marco Demaio" it's the 1st page. The amazing thing is that it has still got NO PageRank at all: Google toolbar states loud and clear "No PageRank information available". It's odd!

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  • localhost/phpmyadmin pulls blank page

    - by Atul Modi
    When I tried configuring local machine as a Internet Gateway with website development capabilities over it and I installed all required software into it. I also had disable the selinux into it. But PROBLEM is when I do http://localhost/phpMyAdmin or all lower case than the page shows it as a blank page. I am pasting code from httpd.conf file into this as well as from phpMyAdmin.conf file I am using Fedora 16 for this. httpd.conf ServerTokens OS ServerRoot "/etc/httpd" PidFile run/httpd.pid Timeout 60 KeepAlive Off MaxKeepAliveRequests 100 KeepAliveTimeout 5 StartServers 8 MinSpareServers 5 MaxSpareServers 20 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 4000 StartServers 4 MaxClients 300 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 Listen 80 LoadModule auth_basic_module modules/mod_auth_basic.so LoadModule auth_digest_module modules/mod_auth_digest.so LoadModule authn_file_module modules/mod_authn_file.so LoadModule authn_alias_module modules/mod_authn_alias.so LoadModule authn_anon_module modules/mod_authn_anon.so LoadModule authn_dbm_module modules/mod_authn_dbm.so LoadModule authn_default_module modules/mod_authn_default.so LoadModule authz_host_module modules/mod_authz_host.so LoadModule authz_user_module modules/mod_authz_user.so LoadModule authz_owner_module modules/mod_authz_owner.so LoadModule authz_groupfile_module modules/mod_authz_groupfile.so LoadModule authz_dbm_module modules/mod_authz_dbm.so LoadModule authz_default_module modules/mod_authz_default.so LoadModule authn_dbd_module modules/mod_authn_dbd.so LoadModule dbd_module modules/mod_dbd.so LoadModule ldap_module modules/mod_ldap.so LoadModule authnz_ldap_module modules/mod_authnz_ldap.so LoadModule include_module modules/mod_include.so LoadModule log_config_module modules/mod_log_config.so LoadModule logio_module modules/mod_logio.so LoadModule env_module modules/mod_env.so LoadModule ext_filter_module modules/mod_ext_filter.so LoadModule mime_magic_module modules/mod_mime_magic.so LoadModule expires_module modules/mod_expires.so LoadModule deflate_module modules/mod_deflate.so LoadModule headers_module modules/mod_headers.so LoadModule usertrack_module modules/mod_usertrack.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule mime_module modules/mod_mime.so LoadModule dav_module modules/mod_dav.so LoadModule status_module modules/mod_status.so LoadModule autoindex_module modules/mod_autoindex.so LoadModule info_module modules/mod_info.so LoadModule dav_fs_module modules/mod_dav_fs.so LoadModule vhost_alias_module modules/mod_vhost_alias.so LoadModule negotiation_module modules/mod_negotiation.so LoadModule dir_module modules/mod_dir.so LoadModule actions_module modules/mod_actions.so LoadModule speling_module modules/mod_speling.so LoadModule userdir_module modules/mod_userdir.so LoadModule alias_module modules/mod_alias.so LoadModule substitute_module modules/mod_substitute.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_balancer_module modules/mod_proxy_balancer.so LoadModule proxy_ftp_module modules/mod_proxy_ftp.so LoadModule proxy_http_module modules/mod_proxy_http.so LoadModule proxy_ajp_module modules/mod_proxy_ajp.so LoadModule proxy_connect_module modules/mod_proxy_connect.so LoadModule cache_module modules/mod_cache.so LoadModule suexec_module modules/mod_suexec.so LoadModule disk_cache_module modules/mod_disk_cache.so LoadModule cgi_module modules/mod_cgi.so LoadModule version_module modules/mod_version.so Include conf.d/*.conf User apache Group apache ServerAdmin root@localhost UseCanonicalName Off DocumentRoot "/var/www/html" Options FollowSymLinks AllowOverride None Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all UserDir disabled DirectoryIndex index.html index.htm index.php AccessFileName .htaccess Order allow,deny Deny from all Satisfy All TypesConfig /etc/mime.types DefaultType text/plain MIMEMagicFile conf/magic HostnameLookups Off ErrorLog logs/error_log LogLevel warn LogFormat "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %s %b" common LogFormat "%{Referer}i - %U" referer LogFormat "%{User-agent}i" agent CustomLog logs/access_log combined ServerSignature On Alias /icons/ "/var/www/icons/" Options Indexes MultiViews FollowSymLinks AllowOverride None Order allow,deny Allow from all # Location of the WebDAV lock database. DAVLockDB /var/lib/dav/lockdb ScriptAlias /cgi-bin/ "/var/www/cgi-bin/" AllowOverride None Options None Order allow,deny Allow from all IndexOptions FancyIndexing VersionSort NameWidth=* HTMLTable Charset=UTF-8 AddIconByEncoding (CMP,/icons/compressed.gif) x-compress x-gzip AddIconByType (TXT,/icons/text.gif) text/* AddIconByType (IMG,/icons/image2.gif) image/* AddIconByType (SND,/icons/sound2.gif) audio/* AddIconByType (VID,/icons/movie.gif) video/* AddIcon /icons/binary.gif .bin .exe AddIcon /icons/binhex.gif .hqx AddIcon /icons/tar.gif .tar AddIcon /icons/world2.gif .wrl .wrl.gz .vrml .vrm .iv AddIcon /icons/compressed.gif .Z .z .tgz .gz .zip AddIcon /icons/a.gif .ps .ai .eps AddIcon /icons/layout.gif .html .shtml .htm .pdf AddIcon /icons/text.gif .txt AddIcon /icons/c.gif .c AddIcon /icons/p.gif .pl .py AddIcon /icons/f.gif .for AddIcon /icons/dvi.gif .dvi AddIcon /icons/uuencoded.gif .uu AddIcon /icons/script.gif .conf .sh .shar .csh .ksh .tcl AddIcon /icons/tex.gif .tex AddIcon /icons/bomb.gif core AddIcon /icons/back.gif .. AddIcon /icons/hand.right.gif README AddIcon /icons/folder.gif ^^DIRECTORY^^ AddIcon /icons/blank.gif ^^BLANKICON^^ DefaultIcon /icons/unknown.gif ReadmeName README.html HeaderName HEADER.html IndexIgnore .??* *~ # HEADER README* RCS CVS *,v *,t AddLanguage ca .ca AddLanguage cs .cz .cs AddLanguage da .dk AddLanguage de .de AddLanguage el .el AddLanguage en .en AddLanguage eo .eo AddLanguage es .es AddLanguage et .et AddLanguage fr .fr AddLanguage he .he AddLanguage hr .hr AddLanguage it .it AddLanguage ja .ja AddLanguage ko .ko AddLanguage ltz .ltz AddLanguage nl .nl AddLanguage nn .nn AddLanguage no .no AddLanguage pl .po AddLanguage pt .pt AddLanguage pt-BR .pt-br AddLanguage ru .ru AddLanguage sv .sv AddLanguage zh-CN .zh-cn AddLanguage zh-TW .zh-tw LanguagePriority en ca cs da de el eo es et fr he hr it ja ko ltz nl nn no pl pt pt-BR ru sv zh-CN zh-TW ForceLanguagePriority Prefer Fallback AddDefaultCharset UTF-8 AddType application/x-tar .tgz AddType application/x-httpd-php .php AddType application/x-httpd-php .xml AddHandler application/x-httpd-php .xml AddType application/x-compress .Z AddType application/x-gzip .gz .tgz AddType application/x-x509-ca-cert .crt AddType application/x-pkcs7-crl .crl AddHandler type-map var AddType text/html .shtml AddOutputFilter INCLUDES .shtml Alias /error/ "/var/www/error/" AllowOverride None Options IncludesNoExec AddOutputFilter Includes html AddHandler type-map var Order allow,deny Allow from all LanguagePriority en ForceLanguagePriority Prefer Fallback ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var ErrorDocument 401 /error/HTTP_UNAUTHORIZED.html.var ErrorDocument 403 /error/HTTP_FORBIDDEN.html.var ErrorDocument 404 /error/HTTP_NOT_FOUND.html.var ErrorDocument 405 /error/HTTP_METHOD_NOT_ALLOWED.html.var ErrorDocument 408 /error/HTTP_REQUEST_TIME_OUT.html.var ErrorDocument 500 /error/HTTP_INTERNAL_SERVER_ERROR.html.var ErrorDocument 503 /error/HTTP_SERVICE_UNAVAILABLE.html.var BrowserMatch "Mozilla/2" nokeepalive BrowserMatch "MSIE 4.0b2;" nokeepalive downgrade-1.0 force-response-1.0 BrowserMatch "RealPlayer 4.0" force-response-1.0 BrowserMatch "Java/1.0" force-response-1.0 BrowserMatch "JDK/1.0" force-response-1.0 BrowserMatch "Microsoft Data Access Internet Publishing Provider" redirect-carefully BrowserMatch "MS FrontPage" redirect-carefully BrowserMatch "^WebDrive" redirect-carefully BrowserMatch "^WebDAVFS/1.[0123]" redirect-carefully BrowserMatch "^gnome-vfs/1.0" redirect-carefully BrowserMatch "^XML Spy" redirect-carefully BrowserMatch "^Dreamweaver-WebDAV-SCM1" redirect-carefully Order allow,deny Allow from all # phpMyAdmin.conf Alias /phpMyAdmin /usr/share/phpMyAdmin Alias /phpmyadmin /usr/share/phpMyAdmin Order Allow,Deny Allow from All Allow from 127.0.0.1 Allow from ::1 Order Allow,Deny Allow from All Allow from 127.0.0.1 Allow from ::1 Order Deny,Allow Deny from All Allow from None Order Deny,Allow Deny from All Allow from None Order Deny,Allow Deny from All Allow from None Can anyone help into this area please. Urgent reply will be appreciatable because i am struggling since one and half month for this matter. thank you, Atul

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  • Suggestions for programming language and database for a high end database querying system (>50 milli

    - by mmdave
    These requirements are sketchy at the moment, but will appreciate any insights. We are exploring what would be required to build a system that can handle 50 database million queries a day - specifiically from the programming language and database choice Its not a typical website, but an API / database accessing through the internet. Speed is critical. The application will primarily receive these inputs (about a few kb each) and will have to address each of them via the database lookup. Only a few kb will be returned. The server will be run over https/ssl.

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  • ./rtnet start rteth0-mac: unknown interface: No such device ioctl: No such device

    - by Anisha Kaul
    I have installed the RTnet over Xenomai. RTnet compiled well, and I also tested loopback on the single machine and was able to ping. However I noticed ./rtnet start showing the following output: What should I interpret when all it says is "no such device"? What more info should I provide here for you to help me in getting rid of this error? linux-y3pi:/usr/local/rtnet/sbin # ./rtnet start rteth0: unknown interface: No such device rteth0-mac: unknown interface: No such device ioctl: No such device ioctl: No such device ioctl: No such device ioctl: No such device ioctl (add): No such device vnic0: unknown interface: No such device SIOCSIFADDR: No such device vnic0: unknown interface: No such device SIOCSIFNETMASK: No such device Waiting for all slaves...ioctl: No such device ioctl: No such device linux-y3pi:/usr/local/rtnet/sbin # lsmod: linux-y3pi:/usr/local/rtnet/sbin # lsmod Module Size Used by tdma 18281 0 rtmac 9274 1 tdma rtcfg 49485 0 rtcap 7216 0 rt_loopback 1563 2 rtpacket 5517 0 rtudp 10655 0 rt_8139too 11374 0 rtipv4 22842 2 rtcfg,rtudp rtnet 42130 9 tdma,rtmac,rtcfg,rtcap,rt_loopback,rtpacket,rtudp,rt_8139too,rtipv4 ip6t_LOG 8480 6 xt_tcpudp 3540 2 xt_pkttype 1176 3 ipt_LOG 8201 6 xt_limit 2159 12 snd_pcm_oss 44878 0 snd_mixer_oss 15151 1 snd_pcm_oss snd_seq 55731 0 s nd_seq_device 6698 1 snd_seq edd 8407 0 ip6t_REJECT 4306 3 nf_conntrack_ipv6 8186 4 nf_defrag_ipv6 10128 1 nf_conntrack_ipv6 ip6table_raw 1451 1 xt_NOTRACK 1112 4 ipt_REJECT 2397 3 xt_state 1314 8 iptable_raw 1478 1 iptable_filter 1706 1 ip6table_mangle 1756 0 nf_conntrack_netbios_ns 1678 0 nf_conntrack_ipv4 8957 4 nf_conntrack 80411 5 nf_conntrack_ipv6,xt_NOTRACK,xt_state,nf_conntrack_netbios_ns,nf_conntrack_ipv4 nf_defrag_ipv4 1561 1 nf_conntrack_ipv4 ip_tables 18872 2 iptable_raw,iptable_filter ip6table_filter 1679 1 ip6_tables 19066 4 ip6t_LOG,ip6table_raw,ip6table_mangle,ip6table_filter x_tables 24094 16 ip6t_LOG,xt_tcpudp,xt_pkttype,ipt_LOG,xt_limit,ip6t_REJECT,ip6table_raw,xt_NOTRACK,ipt_REJECT,xt_state,iptable_raw,iptable_filter,ip6table_mangle,ip_tables,ip6table_filter,ip6_tables fuse 69279 3 loop 17417 0 dm_mod 71671 0 snd_hda_codec_via 57768 1 snd_hda_intel 24871 2 snd_hda_codec 95006 2 snd_hda_codec_via,snd_hda_intel snd_hwdep 6540 1 snd_hda_codec snd_pcm 90716 3 snd_pcm_oss,snd_hda_intel,snd_hda_codec snd_timer 22050 2 snd_seq,snd_pcm snd 71410 14 snd_pcm_oss,snd_mixer_oss,snd_seq,snd_seq_device,snd_hda_codec_via,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer soundcore 7854 1 snd iTCO_wdt 11716 0 iTCO_vendor_support 2942 1 iTCO_wdt snd_page_alloc 8324 2 snd_hda_intel,snd_pcm sr_mod 13186 0 cdrom 37628 1 sr_mod i2c_i801 9677 0 pcspkr 1950 0 sg 28847 0 serio_raw 4534 0 ext4 361361 2 jbd2 82943 1 ext4 crc16 1699 1 ext4 i915 500199 2 drm_kms_helper 33537 1 i915 drm 211193 3 i915,drm_kms_helper sd_mod 33977 5 i2c_algo_bit 5625 1 i915 intel_agp 11529 1 i915 intel_gtt 16397 3 i915,intel_agp ata_generic 3787 0 ata_piix 22875 4 ahci 20097 0 libahci 22089 1 ahci libata 194812 4 ata_generic,ata_piix,ahci,libahci scsi_mod 204709 4 sr_mod,sg,sd_mod,libata linux-y3pi:/usr/local/rtnet/sbin #

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  • Searching for a specific option in a man page

    - by mitch_feaster
    I often find myself man'ing a command just to learn about one specific option. Most of the time I can search to the option just fine, unless it's something like ffmpeg or gcc where I have to step through about 40 matches until I get to the actual description of the option... Sometimes I can get lucky and search for the word "options" to get close and then refine it from there, but it would be nice if I could reliably jump straight to the option in question. It would be cool if there was a tool that could parse out the options and build a database on which you could do searches, but after looking at the groff markup for a few pages I've determined it would only be a best-guess effort due to the lack of meta-information in groff markup... In my ideal world woman mode in emacs would support searching for specific options... :) Any tips for jumping straight to a specific option in a man page?

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  • HAProxy: session stickiness triggered by response header possible?

    - by zoli
    I'm investigating HAProxy as a possible replacement for F5. F5 is capable of persisting a session based on a response header value: when HTTP_RESPONSE { set session [HTTP::header X-Session] if {$session ne ""} { persist add uie $session } } and then route all subsequent requests which contain the same session ID in a header, query parameter, path, etc. to the same machine, eg: when HTTP_REQUEST { set session [findstr [HTTP::path] "/session/" 9 / if {$session} { persist uie $session } } I'm wondering if this is even possible to do with HAProxy?

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  • How to achieve zero down time

    - by Hiral Lakdavala
    For an application we want to achieve zero database and application down time using Active Active configuration. Our dB is Oracle Following are my questions: How can we achieve active active configuration in Oracle? Will introducing Cassandra/HBase(or any other No SQL dbs) cloud help in zero downtime or it is only for fast retrieval of data in a large db? Any other options? Thanks and Regards, Hiral

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  • Netscaler - Involving Response Body Replacement with GeoIP Implementation

    - by MrGoodbyte
    I have a Netscaler (10000) NS9.3: Build 52.3.cl There is a document contains a short tutorial about GeoIP database implementation at http://support.citrix.com/article/CTX130701 I have added location database by following this tutorial successfully but instead of dropping connections I need to replace a string in content body. To do that, I created a rewrite action with those parameters. * Name: ns_country_replacement_action * Type: REPLACE_ALL * Target Expression: HTTP.RES.BODY(50000) * Replacement Text: HTTP.RES.HEADER("international") * Pattern: \{\/\*COUNTRY_NAME\*\/\} To insert header called "international", I try to create another rewrite action with those parameters. I'll add this one's policy prior. * Name: ns_country_injection_action * Type: INSERT_HTTP_HEADER * Header Name: international * Header Value: CLIENT.IP.SRC.MATCHES_LOCATION("*.US.*.*.*.*").NOT When I click on create button, it says; Compound expression syntax error, [.*.*").NOT^, 50] I'm not sure but I think that two things might cause this error. The expression I use for MATCHES_LOCATION is wrong but I use same expression in the tutorial. MATCHES_LOCATION().NOT returns BOOLEAN but the field expects STRING. How can I get this work? Do I use right tools to accomplish what I need to do? Thank you. -Umut

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  • Setting MacBook timezone to UTC

    - by Andy A
    To run my web app, I need to set my timezone to UTC on my MacBook. I can do this temporarily by opening a Konsole and entering sudo ln -sf /usr/share/zoneinfo/UTC /etc/localtime However, my timezone returns to normal when I restart my machine! Any advice? Edit : The response to this question by 'Celada' implies that I can just make my Server UTC. I am using Apache Tomcat 7. Adding to Celada's response, how can I make it UTC?

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  • HAProxy authenticated httpchk (health check)

    - by Markel
    I am using HAProxy on EC2 and using httpchk to manage node availability. I had used a pseudo-unique path as the health check route in an attempt to make sure only my servers responded to the health check. Earlier today I had an EC2 server fall out of existence, and before the haproxy config was auto-regenerated (controller issues), Amazon had reassigned the IP to someone whom 200's every request (honeypot?), my HAProxy host then pulled the server back into rotation and started distributing some of my traffic there until the controller recovered and removed the ip from the list. TLDR; Is there a way to add a server authentication method to HAProxy's httpchk?

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  • Why Does Wireless Gear Degrade Over Time?

    - by bahamat
    I saw this originally posted on slashdot, but their comment format is not conducive to actually getting a correct answer. Having directly experienced this phenomenon myself, I'm now asking here where I think I can actually get an educated answer. Here's the original question verbatim: Lately I have replaced several home wireless routers because the signal strength has been found to be degraded. These devices, when new (2+ years ago) would cover an entire house. Over the years, the strength seems to decrease to a point where it might only cover one or two rooms. Of the three that I have replaced for friends, I have not found a common brand, age, etc. It just seems that after time, the signal strength decreases. I know that routers are cheap and easy to replace but I'm curious what actually causes this. I would have assumed that the components would either work or not work; we would either have a full signal or have no signal. I am not an electrical engineer and I can't find the answer online so I'm reaching out to you. Can someone explain how a transmitter can slowly go bad? Common (incorrect, but repeated) answers from slashdot include: Back then your neighbors didn't have wifi, now they do. They drowning you out. I don't think this is likely because replacing the access point with a new one and using the same frequencies solves the problem. Older devices had low transmit power. Crank that baby. As mentioned by a FreeBSD wireless developer this violates regulations and can physically damage the equipment. It was also mentioned that higher power in one direction is not necessarily reciprocated. This shows higher bars, but not necessarily a better connection. Manufacturers make cheap crap designed to wear out. This one actually may be legitimate although it is overly broad. What specifically causes damage over time? Heat? Excessive power? So can anyone provide an informed answer on this? Is there any way to fix these older access points?

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  • PXE booting LACP hosts on Force10 S50N with FTOS

    - by lolwutreddit
    Hardware: S50N Firmware: FTOS 8.4.2.6 Problem: We're trying to PXE boot some servers that are connected via port-channel interfaces with LACP. Current Work-around: we PXE boot a server with a single interface (eth0), and then use a Perl script to turn up the port-channel interfaces after the server is built. Details: Is anyone doing anything similar on Force10 S50 switches with FTOS? If not, is anyone doing this on another S series, or larger chassis-based Force10? I'm wondering if Native VLAN will solve this, since ports in a port-channel cannot explicitly have a VLAN set, and they don't seem to use the tagged or untagged VLAN that the port channel is in. I will confirm this next (I think it's the only thing I haven't tried) Juniper Example: http://broken.net/openindiana/how-to-pxe-boot-systems-on-lacp-using-juniper-switches/ Cisco: there are plenty of documented ways to solve this issue on IOS and Nexus Update/Edit: since there seems to be no way to use interface or port-channel mode commands to get the individual interfaces to show up in spanning-tree (rtsp in this case), the ports should never go into a forwarding state. I'm not going to mess with it anymore unless a) someone that has experience passes it on, or b) Force10 comes up with a solution for this (I'm guessing it will only be introduced on other S platforms (S55, S60), since the S50 seems to be near EOL). I'm basing that on the fact that the Open Automation type features are only being supported on the newer switches.

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  • Limit Apache 2 Memory Usage

    - by UltraNurd
    I am running a hobby webserver off of an ancient Blue & White G3/300 running Debian PPC Squeeze 2.6.30. The performance is okay for a while after a restart, but it eventually gets more and more bogged down. Right now it's at 76 days uptime, and the main culprit seems to be the memory usage of 10+ apache2 processes. I think I need to lower the values for StartServers, MinSpareServers, and/or MaxSpareServers, but I'm not sure which one to adjust, and there are three sections for each depending on which mpm module is in use. How do I tell which of the following sections I need to change, and what are some reasonable values given that the box has 448 MB physical memory (weird upgrade history of one each 64, 128, and 256 sticks)? <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> There aren't any other instances of StartServers in my apache2.conf, but none of those mpm modules appear in mods-available or mods-enabled. Ideas? Thanks!

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  • Adeos's role w.r.t Linux

    - by Anisha Kaul
    The event pipeline The fundamental Adeos structure one must keep in mind is the chain of client domains asking for event control. A domain is a kernelbased software component which can ask the Adeos layer to be notified of: · Every incoming external interrupt, or autogenerated virtual interrupt; · Every system call issued by Linux applications, · Other system events triggered by the kernel code (e.g. Linux task switching, signal notification, Linux task exits etc.). From: Life with Adeos: http://www.xenomai.org/documentation/xenomai-2.4/pdf/Life-with-Adeos-rev-B.pdf Question: Adeos is supposed to be between the hardware and the Linux kernel, I can understand about Adeos telling the Linux about hardware interrupts but Why should Adeos know about the "system call" issued by Linux?

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  • Django Dying on Shared Hosting Environment (Too Many MySQL Connections)

    - by Tom
    I've had a Django site up and running on HostGator (client requirement), following these instructions, for a few weeks now. I had seen two error emails about pages dying with (1040: Too many MySQL connections) but had never been able to recreate the problem. As of today, the site is completely unresponsive and all pages, even the static files, are dying with that error. Two questions: What can I do to fix this (other than caching more stuff)? Why would static files be dying like that? I can request them directly without a problem, so how are they getting run through Django? The shared hosting setup doesn't allow for a <Location> block, but there's a flag in the rewrite rule that says only requests for files that don't exist in the filesystem should be processed. All of my static files exist on the system, though they are symbolically linked files if it matters.

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  • F5/BigIP rule to redirect affinity-bound users from INACTIVE pool node to other ACTIVE node

    - by j pimmel
    We have several server nodes set up for the end users of our system and because we don't use any kind of session replication in the app servers, F5 maintains affinity for users with the ACTIVE node the client was first bound to. At times when we want to re-deploy the app, we change the F5 config and take a node out of the ACTIVE pool. Gradually the users filter off and we can deploy, but the process is a bit slow. We can't just dump all the users into a different node because - given the update heavy nature of the user activities - we could cause them to lose changes. That said, there is one URL/endpoint - call it http://site/product/list - which we know, when the client hits it, that we could shove them off the INACTIVE node they had affinity with and onto a different ACTIVE node. We have had a few tries writing an F5 rule along these lines, but haven't had much success so i thought I might ask here, assuming it's possible - I have no reason to think it's not based on what we have found so far.

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  • SEO: many stackoverflow users' pages have got no Google PR and they are not indexed, why?

    - by Marco Demaio
    If you go to my user page on Stack Overflow and you check it with the Gogle bar you can see has got no PR at all (this does happen for almost any user page, even people with much higher reputation, the only exceptions seem to be the users in page 1, and some other users they have PR). My user page's Page Rank is not only zero, but not calculated at all. When PR is 0 or less than 1, but calculated the Google bar shows white, but when the PR is not even calculated like in my user page the Google bar shows in grey. I further more discovered that my user page is NOT EVEN INDEXED on Google, simple test is searching on Google for the exact page url: "http://stackoverflow.com/users/260080/marco-demaio" and you will see no result. The question is how can this be??? This is really weird to me because of the following reason: If you search on Google for "Marco Demaio" on stackoverflow site only (you can do this by searching "site:stackoverflow.com Marco Demaio") the search result shows hundreds of 'asking/answering questions' pages where I was 'tagged'!!! Let's check one of these: the 1st one that appears now (shows one of the question I asked). We can be sure this page is indexed in Google because comes out in a search moreover its PR is calculated, it's probably nearly zero, but still some PR flows there, the PR bar is not grey, but white: The page shown above has got links to my own user page. I checked the source code of the page shown above and the links are not hidden or set with a rel="nofollow", moreover I can't see any meta character excluding the links on the page from being followed. So what's happening? Why Google does not see my user page at all. Did stackoverflow do something to achieve this? If yes what did they do? Any explantion really appreciates (as always). P.S. obviously I checked also the code of my user page, but I could not find meta tags excluding Google search for the page. P.S. 2 in a desperate adventure I also checked StackOverflow robots but it does not seem to exclude user pages. UPDATE 1 following up on some answers, I did some more research. Excluding for a while the PR problem (since PR is not science), and looking only at the user page on StackOverflow NOT BEING INDEXED problem: pages do not seem to be indexed by Google because of the user reputation, this user for instance has got NOW 200 points less reputation than me and his page is indexed (while mine not). It does not seem even to be connected with months you have been on Stackoverflow, this user (almost my same reputation) has been there for 3 months only and his page is indexed (while mine not and I have been a user for 7 months). It's bizzarre! UPDATE February/2011 As of today the page got indexed by Google at least when you search for "site:stackoverflow.com Marco Demaio" it's the 1st page. The amazing thing is that it has still got NO PageRank at all: Google toolbar states loud and clear "No PageRank information available". It's odd!

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  • Remove Applications page on MDT 2012 Deployment Summary

    - by Ben M.
    I am using SCCM 2012 and MDT 2012 for OSD and app deployment. Because of the nature of how some of the apps need to be detected (and which changes as apps get updated) they show up with a warning sign on the Applications tab of the Deployment Summary. There is pretty much no way to get them all green check marked (not realistically in our setup anyway) so I would like to get rid of that page so that I don't have to hear about it from my teams as they deploy. Any help would be appreciated. MDT Summary screen: Applications Installed (the tab I want to remove)

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