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  • Nginx: bug using if in location, how do I rectify

    - by Quintin Par
    I am using nginx in reverse proxy mode. In my server section I have this code to set expire and cache control of my static files. location ~* ^.+\.(css|js|png|gif)$ { access_log off; expires max; add_header Cache-Control public; if (!-f $request_filename) { proxy_pass http://localhost:82; } } This is quite obviously creating issues. Can someone help me correct this code to use try_files or rewrite?

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  • debugging JBoss 100% CPU usage

    - by Nate
    We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • What is the correct way to distinguish services to which RADIUS request belongs?

    - by John
    If I have 1 generic RADIUS server and a number of clients (VoIP server, VPN server, WIFI access point) how to distinguish senders (NAS) of access and accounting requests? I didn't found anything helpful by reading all related RFCs, there just NAS-IP-Addess or NAS-Identifier is required, but this attributes usually represents IP address of the NAS and this address can not be used as a robust identifier, because it's often possible to fall into the case when 2 different NASes are running on the same server and this attributes can not be customized. Any ideas?

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  • QNAP (469L) with Debian: can't connect to router

    - by agtoever
    I've been running my QNAP 469L with Debian (Wheezy deb7u3) for a few months. Yesterday I upgraded the memory to 4 GB. The system boots fine, but since the upgrade, I'm not able to connect the server to my router (a TP-Link WR941ND). My configuration: The router runs a DHCP server (192.168.67.100 and up), with a preconfigured ip address for the QNAP (192.168.67.10). The router is on 192.168.67.1. As said, Debian is installed on the QNAP (which can be regarded as a normal computer). Networking hardware on the QNAP: Intel PRO/1000 Network Connection using the e1000e kernel module. This is what I have tried so far: Replace the network cable (tried 3 different cables on different router ports). Check for messages from the kernel: dmesg | grep eth. Besides the normal hardware messages I get a ADDRCONF(NETDEV_UP): eth0: link is not ready for each call to ifup. Manually restart the network sudo server networking restart Check sudo ifconfig (eth0 is up, but no ip addresses). Check the /etc/network/interfaces which has (besides the loopback device) an allow-hotplug eth0 and iface eth0 inet dhcp, which is afaik the default Debian configuration. Since the server has two ethernet ports, I checked if I'm using the right port (checked the hardware address that ifconfig reports for eth0 is the same as the hardware address that is in the preconfigured ip address for the server in the router. Do a manual sudo ifdown eth0 && sudo ifup eth0 with no results (but an extra ADDRCONF(NETDEV_UP): eth0: link is not ready in the kernel log) Do a dhcp request dhclient -v eth0: for about a minute requests are send (according to the terminal) and at the end I get a No DHCPOFFERS received. No working leases in persistent database - sleeping.. Check the router system log if DHCP requests are received. I see them for some devices (my Mac, my iPhone) but not from the QNAP. The log entry looks like: DHCPS:Recv REQUEST from 84:85:06:07:75:6A and then a DHCPS:Send ACK to 192.168.67.101. There are no records from the QNAP's hardware address. So the two error messages that I do get are: ADDRCONF(NETDEV_UP): eth0: link is not ready for every ifup and No DHCPOFFERS received. No working leases in persistent database - sleeping. for every DHCP call.

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  • Blocking IP addresses Load Balanced Cluster

    - by Dom
    Hi We're using HAproxy as a front end load balancer / proxy and are looking for solutions to block random IP addresses from jamming the cluster. Is anyone familiar with a conf for HAProxy that can block requests if they exceed a certain threshold from a single IP within a defined period of time. Or can anyone suggest a software solution which could be placed in front of HAProxy to handle this kind of blocking. Thanks Dom--

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  • Subdomain mapping to domain

    - by bobobobo
    What happens if you have 2 DNS entries: Name | Type | Value -------------+-------+-------------- example.com | A | 20.20.20.20 example.com | MX | mail.example.com Does this mean that smtp requests to example.com will map to 20.20.20.20, and somehow request in the headers mail.example.com? What?

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  • is it possible to have two web servers hosted at different places share the same domain name?

    - by patrick
    say I have a wordpress site: https://www.foobar.com and I want to have an entry point to a rails app at a certain subdirectory within that same domain: https://www.foobar.com/rails_app I know this is possible if both the wordpress app and the rails app are hosted on the same box, but is this in anyway possible if they are hosted on different boxes? I do not want to use subdomains because I am trying to allow ajax post requests from one to the other and not having to deal with single origin policy stuff.

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  • Apache mod_proxy dynamic filter

    - by jrhicks
    How can I configure Apache to ProxyBlock content based on something dynamic such as time-of-day or max-use. Basicly I'm curious about the scriptability of Apache. My web-stumbling leads me to believe I can combine mod-proxy and mod-perl in interesting ways to do dynamic filtering. But I'm pretty lost. What are some general instructions, tutorials, books, technologies to begin scripting Apache (or any suitable proxy).

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  • Print from MAC OS 10.5.8 to HPC3180 on Windows 7, How?

    - by Tom Groszko
    Can anyone point to a document that describes how to print from a Max OS 10.5.8 to an HP Photosmart C3180 series print connected to Windows 7. I can’t get anything but nonsense to print. I was able to do this with Windows XP, could not do it with Vista and am now hopping to get it done with System 7. HP has been no help at all. Apparently nobody who works for them knows anything about both computers.

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  • Why Windows needs reboot a lot more than Linux?

    - by kolistivra
    Hi, I use both Ubuntu and Windows XP. One thing that catches my attention for a long time is the high need for reboots in Windows. Most of the time when I install a program, Windows requests to reboot system. This happens considerably more frequently than Linux. Why is it so? Thanks!

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  • Firefox, reload without cache check

    - by pmoleri
    It looks like a popular question but it's just the opposite. When I visit a site in Firefox 15 I have two different behaviours when: Pressing enter in the address bar Pressing F5 or the refresh button If I look in the network console I can see that F5 does a lot more requests, most of them about cached resources and with a 304-Not Modified answer. Is there's any shortcut to make a quick refresh? Just like pressing enter on the address bar.

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  • Nginx config - serving index.html not working

    - by Bill
    I can't figure out how to redirect / to index.html. I've gone through the threads on serverfault and I think I've tried every suggestion including: rewrite statements within location / index index.html at the server level, within location / and within static content moving node.js proxy statements to location ~ /i instead of within location / Obviously something is wrong somewhere else in my configuration. Here is my nginx.conf: worker_processes 1; pid /home/logs/nginx.pid; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; error_log /home/logs/error.log; access_log /home/logs/access.log combined; include sites-enabled/*; } and my server config located in sites-enabled server { root /home/www/public; listen 80; server_name localhost; # proxy request to node location / { index index.html index.htm; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-NginX-Proxy true; proxy_pass http://127.0.0.1:3010; proxy_redirect off; break; } # static content location ~ \.(?:ico|jpe?g|jpeg|gif|css|png|js|swf|xml|woff|eot|svg|ttf|html)$ { access_log off; add_header Pragma public; add_header Cache-Control public; expires 30d; } gzip on; gzip_vary on; gzip_http_version 1.0; gzip_comp_level 2; gzip_proxied any; gzip_min_length 1000; gzip_disable "msie6"; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; } Everything else is working just fine. Requests get proxied to node correctly and static content is served correctly. I just need to be able to forward requests made to / to /index.html.

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  • On ubuntu 10.04, what is the recommended RoR stack?

    - by Kurucu
    I can't find clear answers / methods on this. As seen elsewhere, passenger and RoR under apache gobble up ram on my VPS. I've tried a multitude of stacks and implementations, currently resting on a sub optimal apache/cgi/rails configuration, which has swapped my ram usage for CPU time and slow response to requests. Can anyone recommend an efficient and preferably simple to administer method of setting up rails apps in ubuntu 10.04 server?

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  • Firewall/Router upgrade

    - by Atlas
    We've been using a SonicWall TZ170 for several years, it's been working fine with occasional glitches. Now we switched to a 100Mpbs broadband, and the firewall has become the bottleneck for internet access because its max throughput is around 20-30Mpbs. Any ideas for a replacement? Brand/Model?

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  • Do proxies really provide anonimity?

    - by user36269
    Do web proxies really provide anonimity? I mean, without someone asking for logs in a web proxy server for who/when connected, is it impossible to know who was behind that ip? I'm asking this because I heard somewhere that some technologies (like "flash") bypass personal ip information for requests or something like that. (I'm a noob in server configuration and concepts like DNS and proxies. Thanks!)

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  • Sygate personal firewall causing trouble

    - by sabo
    Since some reinstalls my Sygate Personal Firewall is beginning to make trouble: It loooves to fully block/extremely delay POST HTTP requests and some random sites in general. It slows everything down, generally Reinstall doesn't work. What could cause the problem? Is there a really leightweight firewall as an alternative out there? Thanks

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  • What kind of scaling method is it, when you add new software to a single server to handle more users? [on hold]

    - by Phil
    I have read about scaling (in terms of terminology and methods). This got me confused about the following: On a single computer, running a web server (say apache), if the system administrator adds a front, caching, reverse-proxy such as Varnish, which in that scenario increase the amount of requests this server is able to handle. My question: Setting up such cache increases the capacity of the server to handle work, hence scales it, but without increasing neither the amount of nodes or the node's capacity. What is the name for this type of scaling?

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  • What does the float number indicate when using varnishtop?

    - by Abs
    I have Varnish running and I wanted to see what http response codes commonly occur. I used: varnishtop -i TxStatus However, I am struggling to work out what the numbers on the right mean? Is it number of requests? list length 7 1322.16 TxStatus 200 60.43 TxStatus 302 8.67 TxStatus 304 3.14 TxStatus 500 2.96 TxStatus 404 0.80 TxStatus 301 0.56 TxStatus 403

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