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  • Varnish default.vcl grace period

    - by Vladimir
    These are my settings for a grace period (/etc/varnish/default.vcl) sub vcl_recv { .... set req.grace = 360000s; ... } sub vcl_fetch { ... set beresp.grace = 360000s; ... } I tested Varnish using localhost and nodejs as a server. I started localhost, the site was up. Then I disconnected server and the site got disconnected in less than 2 min. It says: Error 503 Service Unavailable Service Unavailable Guru Meditation: XID: 1890127100 Varnish cache server Could you tell me what could be the problem? sub vcl_fetch { if (beresp.ttl < 120s) { ##std.log("Adjusting TTL"); set beresp.ttl = 36000s; ##120s; } # Do not cache the object if the backend application does not want us to. if (beresp.http.Cache-Control ~ "(no-cache|no-store|private|must-revalidate)") { return(hit_for_pass); } # Do not cache the object if the status is not in the 200s if (beresp.status >= 300) { # Remove the Set-Cookie header #remove beresp.http.Set-Cookie; return(hit_for_pass); } # # Everything below here should be cached # # Remove the Set-Cookie header ####remove beresp.http.Set-Cookie; # Set the grace time ## set beresp.grace = 1s; //change this to minutes in case of app shutdown set beresp.grace = 360000s; ## 10 hour - reduce if it has negative impact # Static assets - browser caches tpiphem for a long time. if (req.url ~ "\.(css|js|.js|jpg|jpeg|gif|ico|png)\??\d*$") { /* Remove Expires from backend, it's not long enough */ unset beresp.http.expires; /* Set the clients TTL on this object */ set beresp.http.cache-control = "public, max-age=31536000"; /* marker for vcl_deliver to reset Age: */ set beresp.http.magicmarker = "1"; } else { set beresp.http.Cache-Control = "private, max-age=0, must-revalidate"; set beresp.http.Pragma = "no-cache"; } if (req.url ~ "\.(css|js|min|)\??\d*$") { set beresp.do_gzip = true; unset beresp.http.expires; set beresp.http.cache-control = "public, max-age=31536000"; set beresp.http.expires = beresp.ttl; set beresp.http.age = "0"; } ##do not duplicate these settings if (req.url ~ ".css") { set beresp.do_gzip = true; unset beresp.http.expires; set beresp.http.cache-control = "public, max-age=31536000"; set beresp.http.expires = beresp.ttl; set beresp.http.age = "0"; } if (req.url ~ ".js") { set beresp.do_gzip = true; unset beresp.http.expires; set beresp.http.cache-control = "public, max-age=31536000"; set beresp.http.expires = beresp.ttl; set beresp.http.age = "0"; } if (req.url ~ ".min") { set beresp.do_gzip = true; unset beresp.http.expires; set beresp.http.cache-control = "public, max-age=31536000"; set beresp.http.expires = beresp.ttl; set beresp.http.age = "0"; } ## If the request to the backend returns a code other than 200, restart the loop ## If the number of restarts reaches the value of the parameter max_restarts, ## the request will be error'ed. max_restarts defaults to 4. This prevents ## an eternal loop in the event that, e.g., the object does not exist at all. if (beresp.status != 200 && beresp.status != 403 && beresp.status != 404) { return(restart); } if (beresp.status == 302) { return(deliver); } # Never cache posts if (req.url ~ "\/post\/" || req.url ~ "\/submit\/" || req.url ~ "\/ask\/" || req.url ~ "\/add\/") { return(hit_for_pass); } ##check this setting to ensure that it does not cause issues for browsers with no gzip if (beresp.http.content-type ~ "text") { set beresp.do_gzip = true; } if (beresp.http.Set-Cookie) { return(deliver); } ##if (req.url == "/index.html") { set beresp.do_esi = true; ##} ## check if this is needed or should be used # return(deliver); the object return(deliver); } sub vcl_recv { ##avoid leeching of images call hot_link; set req.grace = 360000s; ##2m ## if one backend is down - use another if (req.restarts == 0) { set req.backend = cache_director; ##we can specify individual VMs } else if (req.restarts == 1) { set req.backend = cache_director; } ## post calls should not be cached - add cookie for these requests if using micro-caching # Pass requests that are not GET or HEAD if (req.request != "GET" && req.request != "HEAD") { return(pass); ## return(pass) goes to backend - not cache } # Don't cache the result of a redirect if (req.http.Referer ~ "redir" || req.http.Origin ~ "jumpto") { return(pass); } # Don't cache the result of a redirect (asking for logon) if (req.http.Referer ~ "post" || req.http.Referer ~ "submit" || req.http.Referer ~ "add" || req.http.Referer ~ "ask") { return(pass); } # Never cache posts - ensure that we do not use these strings in our URLs' that need to be cached if (req.url ~ "\/post\/" || req.url ~ "\/submit\/" || req.url ~ "\/ask\/" || req.url ~ "\/add\/") { return(pass); } ## if (req.http.Authorization || req.http.Cookie) { if (req.http.Authorization) { /* Not cacheable by default */ return (pass); } # Handle compression correctly. Different browsers send different # "Accept-Encoding" headers, even though they mostly all support the same # compression mechanisms. By consolidating these compression headers into # a consistent format, we can reduce the size of the cache and get more hits. # @see: http:// varnish.projects.linpro.no/wiki/FAQ/Compression if (req.http.Accept-Encoding) { if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|ico)$") { # No point in compressing these remove req.http.Accept-Encoding; } else if (req.http.Accept-Encoding ~ "gzip") { # If the browser supports it, we'll use gzip. set req.http.Accept-Encoding = "gzip"; } else if (req.http.Accept-Encoding ~ "deflate") { # Next, try deflate if it is supported. set req.http.Accept-Encoding = "deflate"; } else { # Unknown algorithm. Remove it and send unencoded. unset req.http.Accept-Encoding; } } # lookup graphics, css, js & ico files in the cache if (req.url ~ "\.(png|gif|jpg|jpeg|css|.js|ico)$") { return(lookup); } ##added on 0918 - check if it causes issues with user specific content if (req.request == "GET" && req.http.cookie) { return(lookup); } # Pipe requests that are non-RFC2616 or CONNECT which is weird. if (req.request != "GET" && req.request != "HEAD" && req.request != "PUT" && req.request != "POST" && req.request != "TRACE" && req.request != "OPTIONS" && req.request != "DELETE") { ##closing connection and calling pipe return(pipe); } ##purge content via localhost only if (req.request == "PURGE") { if (!client.ip ~ purge) { error 405 "Not allowed."; } return(lookup); } ## do we need this? ## return(lookup); }

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  • Tomcat Clustering and Load Balancing ?

    - by Rodrigo Asensio
    I have 3 tomcat servers where users get into all time. They are 3 because the processing of each request is heavy (lot of sql). Users enters to server 1 or 2 or 3. Now I want to make them "one". I know I need do clustering but, will clustering spread the requests thru the 3 servers or here is where I need implement load balancing with apache2 ?

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  • How do I notify Oracle that an IIS Worker Process is about to recycle?

    - by Brien
    I have an ASP.NET web application with an Oracle back end. The worker process recycling in IIS is set for 40 minutes, and when that occurs, the Oracle server sets a mutex lock while it cleans up all of its open connections. During this cleanup (up to a few minutes in duration), all DB requests get a timeout. Is there a way for IIS to notify Oracle that a worker process recycle is about to occur, so Oracle can be smarter about how it cleans up its resources without locking the entire database?

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  • Web server build end user acceptance testing.

    - by Zak
    I have a web server image that I am responsible for building across multiple servers. I have a list of about 50 URL's that I am supposed to go to and confirm the correct content is showing up. Which automated tools exist to do this easily (without writing a bunch of curl requests and regexes in a script file) .

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  • Whats the best way to setup an IIS7 Webfarm for an ASP.NET Application

    - by sontek
    We are looking to setup an IIS7 WebFarm... We have 2 IIS7/Windows Server 2008 boxes that will act as the load balanced webservers. How do you setup IIS/Windows Server 2008 to handle balancing the requests between the 2 servers? What is the best way to sync deployments so we only have to deploy to 1 place. Can we just have them sync their structures or do we have to use a NAS/Network Share?

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  • Cisco IOS rewrite http url

    - by ensnare
    Is there a way that I can configure my router to rewrite http requests? So for example, if: http://www.example.com/porn.gif is being accessed, it'll be re-written as: http://172.16.0.1/denied.gif But transparently returned to the client? Thank you.

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  • Nginx / uWsgi / Django site can handle more traffic with rewrite URL

    - by Ludo
    Hi there. I'm running a Django app, using uWsgi behind Nginx. I've been doing some performance tuning and load testing using ApacheBench and have discovered something unexpected which I wonder if someone could explain for me. In my Nginx config I have a rewrite directive which catches lots of different URL permutations and then forwards them to the canonical URL I wish to use, eg, it traps www.mysite.com/whatever, www.mysite.co.uk/whatever and forwards them all to http://mysite.com/whatever. If I load test against any of the URLs listed with a redirect (ie, NOT the canonical URL which it is eventually forwarded to), it can serve 15000 concurrent connections without breaking a sweat. If I load test against the canonical URL, which the above test I would have expected got forwarded to anyway, it can't handle nearly as much. It will drop about 4000 of the 15000 requests, and can only handle about 9000 reliably. This is the command line I'm using to test: ab -c15000 -n15000 http://www.mysite.com/somepath/ and ab -c15000 -n15000 http://mysite.com/somepath/ I've tried several different types - it makes no different which order I do them in. This doesn't make sense to me - I can understand why the requests involving a redirect may not handle quite so many concurrent connections, but it's happening the other way round. Can anyone explain? I'd really prefer it if the canonical URL was the one which could handle more traffic. I'll post my Nginx config below. Thanks loads for any help! server { server_name www.somesite.com somesite.net www.somesite.net somesite.co.uk www.somesite.co.uk; rewrite ^(.*) http://somesite.com$1 permanent; } server { root /home/django/domains/somesite.com/live/somesite/; server_name somesite.com somesite-live.myserver.somesite.com; access_log /home/django/domains/somesite.com/live/log/nginx.log; location / { uwsgi_pass unix:////tmp/somesite-live.sock; include uwsgi_params; } location /media { try_files $uri $uri/ /index.html; } location /site_media { try_files $uri $uri/ /index.html; } location = /favicon.ico { empty_gif; } }

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  • qmail throws error "CNAME_­lookup_­failed_­temporarily"

    - by Supratik
    I am using Qmail and when I am sending mails I am sometimes getting the bellow error in my log for a particular domain. Jun 22 05:20:47 221832-web1 qmail: 1308738047.397431 delivery 1040373: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/ Can anyone please tell me what are the factors responsible for such error ? What are the DNS requests sent by Qmail when sending an email ? FYI: The patch for the DNS cache size issue is already included in Qmail.

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  • BIND split-view DNS config problem

    - by organicveggie
    We have two DNS servers: one external server controlled by our ISP and one internal server controlled by us. I'd like internal requests for foo.example.com to map to 192.168.100.5 and external requests continue to map to 1.2.3.4, so I'm trying to configure a view in bind. Unfortunately, bind fails when I attempt to reload the configuration. I'm sure I'm missing something simple, but I can't figure out what it is. options { directory "/var/cache/bind"; forwarders { 8.8.8.8; 8.8.4.4; }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; zone "." { type hint; file "/etc/bind/db.root"; }; zone "localhost" { type master; file "/etc/bind/db.local"; }; zone "127.in-addr.arpa" { type master; file "/etc/bind/db.127"; }; zone "0.in-addr.arpa" { type master; file "/etc/bind/db.0"; }; zone "255.in-addr.arpa" { type master; file "/etc/bind/db.255"; }; view "internal" { zone "example.com" { type master; notify no; file "/etc/bind/db.example.com"; }; }; zone "example.corp" { type master; file "/etc/bind/db.example.corp"; }; zone "100.168.192.in-addr.arpa" { type master; notify no; file "/etc/bind/db.192"; }; I have excluded the entries in the view for allow-recursion and recursion in an attempt to simplify the configuration. If I remove the view and just load the example.com zone directly, it works fine. Any advice on what I might be missing?

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  • How do I get squid peers to talk SSL to each other?

    - by Marcelo Cantos
    How would I set up a pair of squid proxies so that one uses the other as a parent and all traffic between them is encrypted using SSL? I've read the cache_peer documentation, but it's all very fuzzy to me which certs I need to create (and how), which server uses which cert, and so on. Is there a straightforward HOW-TO for this somewhere? Just to be clear, I don't want to know how to setup squid to proxy https requests, or as a reverse proxy for a web server that uses https.

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  • How do I create a virtual directory in IIS?

    - by anil namde
    I have newly installed machine on which i have installed the IIS. On each of the sites I am installing requests are not reaching the site pages. However, if I send a request with the path of a HTML/image file explicitly the resource is accessible. Also, I do not get the "Create Virtual Directory" option in IIS. I only have the option to create a web site. What went wrong?

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  • Web server hits from Akamai IP addresses

    - by Joel
    I am getting a lot of hits to my web server from from multiple IP addresses that are owned by Akamai. This stood out to me as the requests are for resources that are no longer available. These resources should not be being requested - that pages that refer to them are marked as being non-cachable. Any clues?

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  • How to rate-limit in nginx, but including/excluding certain IP addresses?

    - by Jason Cohen
    I'm able to use limit_req to rate-limit all requests to my server. However I'd like to remove the rate restriction for certain IP addresses (i.e. whitelist) and use a different rate restriction for certain others (i.e. certain IPs I'd like as low as 1r/s). I tried using conditionals (e.g. if ( $remote_addr = "1.2.3.4" ) {}) but that seems to work only with rewrite rules, not for rate-limit rules.

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  • Avoid corporate blocked URL's when on Cisco VPN

    - by Marcus
    When I'm on my home PC and on my company VPN I can't get to sites that my company blocks. Is there a way to get around this? Why do my requests to facebook.com go through the VPN? Can you configure your system to, for instance, not go through the VPN for HTTP traffic? Update: We are using Cisco VPN v 5, I'm running on XP

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  • Blank graph for some munin plugins

    - by jack
    I have a munin-master and munin-node installed on same server (Ubuntu 9.10 server). Most pre-installed plugins work well but the following plugins are with blank graph: Memcached bytes used Memcached connections Memcached cache hits and misses Memcached cached items Memcached requests Memcached network traffic MySQL Queries Cache Size I run the following 3 script in terminal and results were ok. /etc/munin/plugins/memcached_bytes /etc/munin/plugins/memcached_counters /etc/munin/plugins/memcached_rates But when I tried the command below after "telnet localhost 4949" fetch memcached_bytes # Unknown service etch memcached_bytes_ # timeout pid 28009 - killing...done Does anyone know the reason?

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  • Can the Firefox password manager store and manage passwords for multiple sub-domains or different UR

    - by Howiecamp
    Can the Firefox password manager store and manage passwords for multiple sub-domains, or for multiple URLs in the same domain? The default behavior of Firefox is that all requests for *.domain.com are treated as the same. I'd like to have Firefox do the following: Store and manage passwords separately for multiple sub-domains, e.g. mail.google.com and picasa.google.com Store and manage passwords separately for different URLs in the same domain, e.g. http://mail.google.com/a/company1.com and http://mail.google.com/a/company2.com

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  • VPN: Does all traffic get routed through the VPN when I am logged in?

    - by Dan
    If I log into a slow VPN with only a 15k/s connection, when I try to go to kernel.org or some other site to download something, is everything getting routed through that other network? (so my max speed for all downloads is 15k/s?) Or are only the DNS requests getting routed and I can still get my normal download speeds I would have been able to before logging into the router?

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  • Server with multiple IP addresses?

    - by RadiantHex
    Hi folks, just wondering how it is actually possible to have a server with multiple IPs I have a python script, and would like to be able to use different IP addresses for different requests. Is this actually possible? EDIT: I'm running CentOS 5 and have 3 IP Addresses asscociated with the machine

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  • Setting up nginx as proxy to apache; All good, but nginx doesn't serve media

    - by becomingGuru
    I have set it up such that nginx proxies request and sends django requests to apache and serves media itself. Following documents my setup: Nginx Configuration: /etc/nginx/nginx.conf user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; access_log /var/log/nginx/access.log; sendfile on; tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; tcp_nodelay on; gzip on; include /etc/nginx/sites-enabled/*; } ===== ngnix proxy /etc/nginx/proxy.conf ============ proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; client_max_body_size 10m; client_body_buffer_size 128k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; =========== Nginx server file: /etc/nginx/sites-enabled/some-name.txt ========== server { listen 208.109.252.110:80; server_name netconf; autoindex on; access_log /home/site/server_logs/nginx_access.log; error_log /home/site/server_logs/nginx_error.log; location / { proxy_pass http://127.0.0.1:80/; include /etc/nginx/proxy.conf; } location /site_media/ { root /home/site/folder/static; } } ========== Nginx very well proxies the request and passes to apache, the required requests, but doesn't serve the media. In the last server file, location site_media is not served, at all. :( Everything seems perfect to me. What is wrong? Thanks in advance.

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  • Load balancing with one server and IIS7(.5)

    - by Lieven Cardoen
    Is it possible to configure loadbalancing on one server with IIS7? What I would like is to have three applications in IIS7 (sites). One site should forward the requests to the other two sites (loadbalanced). Problem is that at a customer of ours loadbalancing is used (with virtual servers). We on the other hand do not have (yet) a virtual environment and only one buildserver. (maybe using Application Request Routing module?)

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  • How do software .dmg files mount or work in OS X?

    - by ymasood
    I am a new Mac user and have an iMac. Coming from the Windows world where everything is installer based, OS X seems to mount .dmg files and run them. I've seen this happen prior to an install and later it requests us to move an icon to the Applications folder. Could someone help me unclutter the install process on OS X. What or how does it work? Thanks in advance!

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