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  • BIND authoritative name server: SERVFAIL?

    - by Luca Tettamanti
    I have a BIND 9.6 instance that acts as a caching NS for the whole building and is also authoritative for an internal zone ("example" below): zone "example" { type master; file "example"; update-policy { grant dhcp-update subdomain example. A TXT; }; }; Due to a rogue switch we lost connectivity with the rest of the world, and the NS started answering SERVFAIL; what surprised me was that the server was also unable to respond to queries for the example domain. What is the reason of this behavior? Shouldn't the NS be able to answer since it has authoritative data? edit: The rest of the configuration is the standard one shipped with Debian: hints for the root servers and the zones for localhost and broadcast.

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  • Nginx + Haproxy + Thin + Rails - 503 Service Unavailable -

    - by Luca G. Soave
    I don't know how troubleshoot this. I get "503 Service Unavailable" http error for all "nginx upstreams" proxy passing calls to haproxy fast_thin and slow_thin ( server 127.0.0.1:3100 and server 127.0.0.1:3200 ), which loadbalance on 6 Thin servers ( 127.0.0.1:3000 .. 3005 ). Static files like /blog are currently fine. The falldown is: nginx on port 80 - haproxy on 3100 and 3200 - thin on 3000 .. 3005 and then Rails. Here it is /etc/nginx/nginx.conf : user nginx; worker_processes 2; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; sendfile on; tcp_nopush on; keepalive_timeout 65; tcp_nodelay on; include /etc/nginx/conf.d/*.conf; } then /etc/nginx/conf.d/default.conf upstream fast_thin { server 127.0.0.1:3100; } upstream slow_thin { server 127.0.0.1:3200; } server { listen 80; server_name www.gitwatcher.com; rewrite ^/(.*) http://gitwatcher.com/$1 permanent; } server { listen 80; server_name gitwatcher.com; access_log /var/www/gitwatcher/log/access.log; error_log /var/www/gitwatcher/log/error.log; root /var/www/gitwatcher/public; # index index.html; location /about { proxy_pass http://fast_thin; break; } location /trends { proxy_pass http://slow_thin; break; } location /categories { proxy_pass http://slow_thin; break; } location /signout { proxy_pass http://slow_thin; break; } location /auth/github { proxy_pass http://slow_thin; break; } location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (-f $request_filename/index.html) { rewrite (.*) $1/index.html break; } if (-f $request_filename.html) { rewrite (.*) $1.html break; } if (!-f $request_filename) { proxy_pass http://slow_thin; break; } } } then haproxy config file /etc/haproxy/haproxy.cfg : global log 127.0.0.1 local0 log 127.0.0.1 local1 notice #log loghost local0 info maxconn 4096 #chroot /usr/share/haproxy user haproxy group haproxy daemon #debug #quiet nbproc 1 # number of processing cores defaults log global retries 3 maxconn 2000 contimeout 5000 mode http clitimeout 60000 # maximum inactivity time on the client side srvtimeout 30000 # maximum inactivity time on the server side timeout connect 4000 # maximum time to wait for a connection attempt to a server to succeed option httplog option dontlognull option redispatch option httpclose # disable keepalive (HAProxy does not yet support the HTTP keep-alive mode) option abortonclose # enable early dropping of aborted requests from pending queue option httpchk # enable HTTP protocol to check on servers health option forwardfor # enable insert of X-Forwarded-For headers balance roundrobin # each server is used in turns, according to assigned weight stats enable # enable web-stats at /haproxy?stats stats auth haproxy:pr0xystats # force HTTP Auth to view stats stats refresh 5s # refresh rate of stats page listen rails_proxy 127.0.0.1:3100 # - equal weights on all servers # - maxconn will queue requests at HAProxy if limit is reached # - minconn dynamically scales the connection concurrency (bound my maxconn) depending on size of HAProxy queue # - check health every 20000 microseconds server web1 127.0.0.1:3000 weight 1 minconn 3 maxconn 6 check inter 20000 server web1 127.0.0.1:3001 weight 1 minconn 3 maxconn 6 check inter 20000 server web1 127.0.0.1:3002 weight 1 minconn 3 maxconn 6 check inter 20000 listen slow_proxy 127.0.0.1:3200 # cluster for slow requests, lower the queues, check less frequently server slow1 127.0.0.1:3003 weight 1 minconn 1 maxconn 3 check inter 40000 server slow2 127.0.0.1:3004 weight 1 minconn 1 maxconn 3 check inter 40000 server slow3 127.0.0.1:3005 weight 1 minconn 1 maxconn 3 check inter 40000 and the Thin config file /etc/thin/gitwatcher.yml : --- chdir: /var/www/gitwatcher environment: production address: 0.0.0.0 port: 3000 timeout: 30 log: log/thin.log pid: tmp/pids/thin.pid max_conns: 1024 max_persistent_conns: 100 require: [] wait: 30 servers: 6 daemonize: true if I look into open listen ports, I got the following : root@fullness:/var/www/gitwatcher# lsof | grep TCP | egrep "nginx|haproxy|thin" nginx 834 root 8u IPv4 921 0t0 TCP *:http (LISTEN) nginx 835 nginx 8u IPv4 921 0t0 TCP *:http (LISTEN) nginx 837 nginx 8u IPv4 921 0t0 TCP *:http (LISTEN) haproxy 1908 haproxy 4u IPv4 11699 0t0 TCP localhost:3100 (LISTEN) haproxy 1908 haproxy 6u IPv4 11701 0t0 TCP localhost:3200 (LISTEN) root@fullness:/var/www/gitwatcher# iptables -L get me the following : Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp dpt:22222 ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT all -- anywhere anywhere DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere Any help ?

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  • Local DNS server (bind) and the router DHCP

    - by Luca
    I just set up an internal http server for internal use (I set up Redmine), in a small network (30 or so PCs). I set up the http server on a virtual box ubuntu, that runs also the DNS server (bind). In the DNS lookup I added the Redmine server name (redmine.engserver <- 192.168.1.14) and as forwarders the outside ISP DNS IP adresses. I am using a small wi-fi router (ASUS RT-N66U) as DHCP (and as gateway). In the DHCP config page I set up as DNS the ubuntu server IP (it is fixed 192.168.1.14). Now when I connect a new PC to the network, the DHCP router issues its new IP and as DNS servers it issues: primary: 192.168.1.14 (ubuntu machine) and seconary 192.168.1.1 (the router itself). ipconfig /all Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DHCPv6 IAID . . . . . . . . . . . : 248539109 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-15-AA-3F-D0-67-E5-49-A7-EF DNS Servers . . . . . . . . . . . : 192.168.1.14 192.168.1.1 NetBIOS over Tcpip. . . . . . . . : Enabled Before changing the DHCP setting on the router, I would always get only one DNS server: 192.168.1.1 (which uses probably DNS forwarding to external public DNS services). The problem is this: If in my browser I type www.google.com, it works all the time. If in the browser I type http://redmine.engserver/ it works most of the time, but sometimes it ends up with a yahoo page search or something else. In the DNS cache it shows as (Server not found). ipconfig /displaydns I looked with wireshark and it seems like sometimes the client PC interrogates the secondary DNS (192.168.1.1) instead of the first 192.168.1.14. Obviously this one is a public domain and it does not have the redmine.engserver entry. What is wrong in this configuration? Is it even legitimate to have 2 DNS (one internal and one forwarded by the router) which are inconsistent? Is there another way to have a local name service in a small office network? Why is the router DHCP issuing itself as DNS?

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  • apache2 mysql authentication module and SHA1 encryption

    - by Luca Rossi
    I found myself in a setup on where I need to enable some authentication method using mysql. I already have an user scheme. That user scheme is working like a charm with MD5 password and CRYPT, but when I turn to SHA1sum it says: [Fri Oct 26 00:03:20 2012] [error] Unsupported encryption type: Sha1sum No useful debug informations on log files. This is my setup and some info: debian6 apache and ssl installed packages: root@sistemichiocciola:/etc/apache2/mods-available# dpkg --list | grep apache ii apache2 2.2.16-6+squeeze8 Apache HTTP Server metapackage ii apache2-mpm-prefork 2.2.16-6+squeeze8 Apache HTTP Server - traditional non-threaded model ii apache2-utils 2.2.16-6+squeeze8 utility programs for webservers ii apache2.2-bin 2.2.16-6+squeeze8 Apache HTTP Server common binary files ii apache2.2-common 2.2.16-6+squeeze8 Apache HTTP Server common files ii libapache2-mod-auth-mysql 4.3.9-13+b1 Apache 2 module for MySQL authentication ii libapache2-mod-php5 5.3.3-7+squeeze14 server-side, HTML-embedded scripting language (Apache 2 module) root@sistemichiocciola:/etc/apache2/sites-enabled# dpkg --list | grep ssl ii libssl-dev 0.9.8o-4squeeze13 SSL development libraries, header files and documentation ii libssl0.9.8 0.9.8o-4squeeze13 SSL shared libraries ii openssl 0.9.8o-4squeeze13 Secure Socket Layer (SSL) binary and related cryptographic tools ii openssl-blacklist 0.5-2 list of blacklisted OpenSSL RSA keys ii ssl-cert 1.0.28 simple debconf wrapper for OpenSSL my vhost setup: AuthMySQL On Auth_MySQL_Host localhost Auth_MySQL_User XXX Auth_MySQL_Password YYY Auth_MySQL_DB users AuthName "Sistemi Chiocciola Sezione Informatica" AuthType Basic # require valid-user require group informatica Auth_MySQL_Encryption_Types Crypt Sha1sum AuthBasicAuthoritative Off AuthUserFile /dev/null Auth_MySQL_Password_Table users Auth_MYSQL_username_field email Auth_MYSQL_password_field password AuthMySQL_Empty_Passwords Off AuthMySQL_Group_Table http_groups Auth_MySQL_Group_Field user_group Have I missed a package/configuration or something?

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  • how can i realize a video-wall on 3-9pc with vlc

    - by Luca
    hello! i have to create a videowall, from 3 to 9 monitor. every monitor as a pc. actually, i stream from a server 9 movies with different istances of VLC, but i could also play on every machine the relative video with a single player. there's no problem. the real problem is that i really dont know how to sync the videos on a LAN...unfortunately there is a NETSYNC module inside VLC wich is NOT working. here are some info about my setup: videowall from 3 to 9 monitor || from 3 to 9 pc, all with the same configuration || a gigabit router+switch for the "dedicated" LAN im really stuck in this situation, if anyone has an idea or just a completely different solution, please, share it with me! thanks a lot in advance! :)

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  • FTP - 530 Sorry, the maximum number of clients…?

    - by Luca Filosofi
    Hi All! My problem is that my FTP work great, exept when i upload files on a particular client server! on this server happen that some files are uploaded fine and others not, they stop while uploading at half of it's size, then this error is displayed: 530 Sorry, the maximum number of clients (4) from your host are already connected. Unable to make a connection. Please try again. Obviously this is not true, i'm the only one that is uploading! Anyone had the same experience with this!? PS: i have tried many different FTP, all display the same error or just hung up! Thank's

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  • vmWare virtual image compatibility

    - by luca
    If I create a vmware virtual image on my mac (with vmware Fusion 2) it creates a file line "Ubuntu.vmwarevm" My question (which I couldn't get answered by vmware Support..) is: Will this file be compatible with a ESXi 4.0 server? In general, virtual machine for vmware are all the same format? thanks

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  • PsExec - what if the .exe you run remotely requires user interaction?

    - by Luca Matteis
    I use PsExec to deploy small .exe files to my workstations. Sometimes the .exe, for some reason, is incompatible with the system and opens a popup window with an error or some other message. Is there any way to know when the executable is 'stuck' there requiring user interaction? On my side I just have psexec running and waiting for the .exe to return (which will never return because the popup is stuck there). Since I run PsExec programmatically and I automate all the executions, when this Popup thing happens I find myself with hundreds of psexec processes stuck there and have no result back from them.. What's the best way to handle this sort of issue? Thanks.

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  • TextBoxFor default value empty

    - by Luca Romagnoli
    I have this textbox: <%: Html.TextBoxFor(model = model.DataFine, new { @class = "calendar" })% If datafine is null in the textbox appears 00/00/0000 00:00. i don't want it. I want a empty string. and if datafine isn't null i want the date that is saved. thanks

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  • YUV Textures and Shaders

    - by Luca
    I've always used RGB textures. Now comes up the need of use of YUV textures (a set of three texture, specifying 1 luminance and 2 chrominance channels). Of course the YUV texture could be converted on CPU, getting the RGB texture usable as usual... but I need to get RGB pixel directly on GPU, to avoid unnecessary processor load... The problem became strange, since I require to specifyin the shader source, because a single texture, the following items: Three samplers uniforms, one for each channel Two integer uniforms, for specifying the chrominance channels sampling a mat3 uniform, for specific YUV to RGB conversion matrix. This should be done for each YUV texture... Is it possible to "compress" required uniforms, and getting RGB values quite easily? Actually i think this could aid: Texture sizes, including mipmaps, could be queried. With this, its possible to save the two integer uniforms, since the uniform values are derived the ratio between texture extents The mat3 uniforms could be collected as globals, and with preprocessor could be selected. But what design should I use for specify three (related) textures? Is it possible to use textures levels for accessing multiple textures? Texture arrays could be usable? And what about using rectangle textures, which doesn't supports mipmaps? Maybe a shader abstraction (struct definition and related function) could aid? Thank you.

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  • Cannot rollback ransaction with Entity Framework

    - by Luca
    I have to do queries on uncommitted changes and I tried to use transactions, but I found that it do not work if there are exceptions. I made a simple example to reproduce the problem. I have a database with only one table called "Tabella" and the table has two fields: "ID" is a autogenerated integer, and "Valore" is an integer with a Unique constraint. Then I try to run this code: using (TransactionScope scope = new TransactionScope()) { Db1Container db1 = new Db1Container(); try { db1.AddToTabella(new Tabella() { Valore = 1 }); db1.SaveChanges(); } catch { } try { db1.AddToTabella(new Tabella() { Valore = 1 }); db1.SaveChanges(); //Unique constraint is violated here and an exception is thrown } catch { } try { db1.AddToTabella(new Tabella() { Valore = 2 }); db1.SaveChanges(); } catch { } //scope.Complete(); //NEVER called } //here everything should be rolled back Now if I look into the database it should contain no records because the transaction should rollback, instead I find two records!!!! One with Valore=1 and one with Valore=2. I am missing something? It looks like the second call to SaveChanges method rollback its own changes and "deletes" the transaction, then the third call to SaveChanges commits the changes of the first and the third insert (at this point it is like the transaction not exists). I also tried to use SaveChanges(false) method (even without calling AcceptAllChanges method), but with no success: I have the same behaviour. I do not want the transaction to be rolled back automatically by SaveChanges, because I want to correct the errors (for example by user interaction in the catch statement) and make a retry. Can someone help me with this? It seems like a "bug", and it is giving me a really big headache...

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  • 24 hours per day and freelance programming jobs

    - by Luca
    I'm working on stimulanting projects at my job. I like it. I like programming! I have accumulated several years of experience now. Sometime happens I develop other projects (even more stimulant of my main job). Some more money cannot hurts! The problem is that my free time has decreased a lot, leading me to develop until late evening. I usually program each day (I like to develop my own projects, even if only a few lines at a time). But it is one thing to plan for my pleasure, it is one thing to plan for business. So, my question is how to balance free time with these additional jobs? What experiences do you have? How much you can develop for long time (in a medium interval, say, weeks)? Every thought is welcome!

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  • Float PPM image file format?

    - by Luca
    I've found a PPM image with the header starting with PF. The resolution number is stored in floating point (-1.000). No comments are inserted to get how it was produced. From the resolution, each pixel is composed by 12 bytes (4 bytes per component)... I suppose they are float or integer numbers. The problem is that I cannot get a clear image. Someone has already found this kind of images?

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  • Gantt Chart online

    - by Luca
    I need to insert a horizontal bar chart in a web page. The thing I have to do is very similar to a Gantt Chart. I'd like to use a javascript library for the purpose. I tried jsgantt, but actually it is not very beautiful. I could evaluate also a server generation of the graph. In case my server side language is Python. It will be part of an internal project with no internet access, so Google Charts isn't an option.

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  • Capture Touch Event on UITableViewCell and after enter didSelectRowAdTindePath method

    - by Luca
    Hi I want to personalize my UITableView changing background when user tap on a specific cell. I've a dedicated ViewController for each cell and if I implement touchesBegan method in this viewController i can change my cell background without any problem. The problem is that the method "didSelectRowAtIndexPath" of the UITableView is no longer called. How can I call it manually? I am in another viewController and I have no access to that method. or how can propagate to the touch tableView? Thanks a lot

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  • OpenGL Shading Language portability

    - by Luca
    I've noticed that my GLSL shaders are not compilable when the GLSL version is lower than 130. What are the most critical elements for having a backward compatible shader source? I don't want to have a full backward compatibility, but I'd like to understand the main guidelines for having simple shaders running on GPU with GLSL lower than 130. Thank you

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  • find elements of a varchar in another varchar

    - by Luca Romagnoli
    hi, i have a varchar field with the content like these: a,b,c,d e,d,a,c b,q,d,e i need to do a query that select only the rows with the field that has elements equals with an input string. ex input: c,a rows selected: a,b,c,d e,d,a,c is possible without use the OR (field like '%a%' OR field like '%c%') ? thanks

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  • The accossoryView of a UITableViewCell disappears after the visible view is changed

    - by Luca
    Hi! I'm experiencing this strange situation. I have a UITableView where, when the user selects a cell, a long (network) process begins. So, I performed this in a background thread and I placed (in the didSelectRowAtIndexPath) a UIActivityIndicatorView as the accessory view. This is what I wrote: UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:indexPath]; UIActivityIndicatorView* activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; cell.accessoryView = activityView; [activityView startAnimating]; [activityView release]; everything seems to work correctly, except that, if during a loading process (when the indicator is animated), I switch the view using a UITabBar, when I go back to the UITableView, the UIActivityIndicatorView that should still be there has disappeared. Any idea of what I did wrong? Thanks!

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  • WinAPI magic and MONO runtime

    - by Luca
    I'm trying to get the same result of a .NET application (see the link Hide TabControl buttons to manage stacked Panel controls for details), but using the MONO runtime instead of the MS .NET runtime. Pratically, when the custom control is executed using the MONO runtime, the underlying message is not sent to the control, causing the tab pages to be shown... Is there a portable solution which is elegant as the linked one? If it is not possible, what are possible workarounds (apart from removing/adding tabs at runtime)?

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  • OpenGL Shading Language backwards compatibility

    - by Luca
    I've noticed that my GLSL shaders are not compilable when the GLSL version is lower than 130. What are the most critical elements for having a backward compatible shader source? I don't want to have a full backward compatibility, but I'd like to understand the main guidelines for having simple (forward compatible) shaders running on GPU with GLSL lower than 130. Of course the problem could be solved with the preprocessor #if __VERSION__ < 130 #define VERTEX_IN attribute #else #define VERTER_IN in #endif But there probably many issues that I ignore. Thank you

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