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  • Keep-Alive header not sent from Tomcat 5.5 http connector?

    - by Codek
    We're currently using a hardware load balancer, which then goes to Apache and that then goes to Tomcat 5.5 via the AJP connector. We've decided to dump apache for various reasons - In our current system it doesnt provide any advantage. However when I look at the headers sent when we do this, the "Keep-Alive: timeout=15 max=96" header doesnt get sent when you use the tomcat http connector Interestingly, i can find no documentiation on "keepalivetimeout" for tomcat5.5, but i can for tomcat6. But neither can i find evidence that tomcat5.5 doesnt support this setting. here's my connector: <Connector port="8090" maxHttpHeaderSize="8192" maxThreads="400" minSpareThreads="150" maxSpareThreads="300" enableLookups="false" connectionTimeout="2" maxKeepAliveRequests="400" disableUploadTimeout="true" /> So; Is there any way I can specify the keepalive timeout if we use the http connector with tomcat 5.5, and force this header entry to be sent? Just to be clear - the exact header entry i see back from the server is this with apache: Keep-Alive: timeout=2, max=100 But nothing from tomcat/coyote. I've looked at this some more, and I dont think the Keep-Alive header entry really matters. The problem seems to be that keep-alives are simply not supported in tomcat 5.5 http connector? They do seem to work in tomcat6 (+java 6). Thanks, Dan

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  • Nginx + uWSGI + Django performance stuck on 100rq/s

    - by dancio
    I have configured Nginx with uWSGI and Django on CentOS 6 x64 (3.06GHz i3 540, 4GB), which should easily handle 2500 rq/s but when I run ab test ( ab -n 1000 -c 100 ) performance stops at 92 - 100 rq/s. Nginx: user nginx; worker_processes 2; events { worker_connections 2048; use epoll; } uWSGI: Emperor /usr/sbin/uwsgi --master --no-orphans --pythonpath /var/python --emperor /var/python/*/uwsgi.ini [uwsgi] socket = 127.0.0.2:3031 master = true processes = 5 env = DJANGO_SETTINGS_MODULE=x.settings env = HTTPS=on module = django.core.handlers.wsgi:WSGIHandler() disable-logging = true catch-exceptions = false post-buffering = 8192 harakiri = 30 harakiri-verbose = true vacuum = true listen = 500 optimize = 2 sysclt changes: # Increase TCP max buffer size setable using setsockopt() net.ipv4.tcp_rmem = 4096 87380 8388608 net.ipv4.tcp_wmem = 4096 87380 8388608 net.core.rmem_max = 8388608 net.core.wmem_max = 8388608 net.core.netdev_max_backlog = 5000 net.ipv4.tcp_max_syn_backlog = 5000 net.ipv4.tcp_window_scaling = 1 net.core.somaxconn = 2048 # Avoid a smurf attack net.ipv4.icmp_echo_ignore_broadcasts = 1 # Optimization for port usefor LBs # Increase system file descriptor limit fs.file-max = 65535 I did sysctl -p to enable changes. Idle server info: top - 13:34:58 up 102 days, 18:35, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 118 total, 1 running, 117 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3983068k total, 2125088k used, 1857980k free, 262528k buffers Swap: 2104504k total, 0k used, 2104504k free, 606996k cached free -m total used free shared buffers cached Mem: 3889 2075 1814 0 256 592 -/+ buffers/cache: 1226 2663 Swap: 2055 0 2055 **During the test:** top - 13:45:21 up 102 days, 18:46, 1 user, load average: 3.73, 1.51, 0.58 Tasks: 122 total, 8 running, 114 sleeping, 0 stopped, 0 zombie Cpu(s): 93.5%us, 5.2%sy, 0.0%ni, 0.2%id, 0.0%wa, 0.1%hi, 1.1%si, 0.0%st Mem: 3983068k total, 2127564k used, 1855504k free, 262580k buffers Swap: 2104504k total, 0k used, 2104504k free, 608760k cached free -m total used free shared buffers cached Mem: 3889 2125 1763 0 256 595 -/+ buffers/cache: 1274 2615 Swap: 2055 0 2055 iotop 30141 be/4 nginx 0.00 B/s 7.78 K/s 0.00 % 0.00 % nginx: wo~er process Where is the bottleneck ? Or what am I doing wrong ?

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  • Difference between "traceroute" and "traceroute -U"

    - by AndiDog
    The manpage of traceroute says that the "-U" parameter (UDP probing) is the default, but I'm getting different results every time. With "-U": traceroute -U www.univ-paris1.fr traceroute to www.univ-paris1.fr (193.55.96.121), 30 hops max, 60 byte packets [...] 13 rap-vl165-te3-2-jussieu-rtr-021.noc.renater.fr (193.51.181.101) 59.445 ms 56.924 ms 56.651 ms [...] 18 * paris1web.univ-paris1.fr (193.55.96.121) 23.797 ms 23.603 ms but the normal traceroute gives me another result (never reaches the final node) - it's either "!X" or just exits after the maximum of 30 hops: traceroute www.univ-paris1.fr traceroute to www.univ-paris1.fr (193.55.96.121), 30 hops max, 60 byte packets [...] 11 te1-1-paris1-rtr-021.noc.renater.fr (193.51.189.38) 28.147 ms 28.250 ms 28.538 ms [... non-responding nodes ...] 28 site-1.03-jussieu.rap.prd.fr (195.221.126.58) 85.941 ms !X * * Note: I tried this very often and always get the same results. The path in my local network is always the same. So what does the "-U" parameter actually change here? I'm especially interested what the reason for "!X" could be (communication administratively prohibited). EDIT: If that helps, paris-traceroute gives me the following for the last hop: 14 P(1, 6) site-1.03-jussieu.rap.prd.fr (195.221.126.58) 34.938 ms !5 !T2 which means that node discards the packet with TTL=2 and returns an unknown message (not "destination unreachable" or the like).

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  • mod_deflate doesn't work [closed]

    - by kikio
    I want to gzip my static files. so put this in .htaccess: <IfModule mod_deflate.c> AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x-javascript application/javascript </IfModule> and looked for mod_deflate in phpinfo() output Loaded Modules section, and I found it. But when I track server responses with Firebug, no gzipped file can be found: HTTP/1.1 200 OK Date: Sat, 08 Sep 2012 21:41:21 GMT Last-Modified: Sat, 08 Sep 2012 21:26:04 GMT Accept-Ranges: bytes Cache-Control: max-age=604800 Expires: Sat, 15 Sep 2012 21:41:21 GMT Vary: Accept-Encoding Keep-Alive: timeout=3, max=50 Connection: Keep-Alive Content-Type: text/css Content-Length: 18206 What's the problem? I'm sure I have mod_deflate enabled (according to php apache_get_modules()). UPDATE: the request headers: GET /d/jquery-ui.css HTTP/1.1 Host: 127.0.0.1 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Connection: keep-alive Pragma: no-cache Cache-Control: no-cache

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  • Why can't I route to some sites from my MacBook Pro that I can see from my iPad?

    - by Robert Atkins
    I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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  • Lenvo B450 won't boot on battery only?

    - by Mywiki Witwiki
    We bought a Lenovo B450 laptop almost a year ago. It comes with a NVIDIA GEFORCE with CUDA graphics and so the battery life is terrible. It will only last 1:30 hours max. We try to run it on battery as much as possible but because the battery life is short sometimes we can't notice that the battery is so low until the computer blacks out. Because of the short battery life, the laptop is always plugged on AC power. One night the computer froze. Because it was already late, I just reset the laptop my pressing the power button for 10 seconds. The laptop shut off but I did not bother restarting it. The next morning, the laptop won't turn on on battery only. It will only turn on on AC power. The computer instantly shuts down(improperly) once the adapter is removed. But the battery was at 100% then. Now it is slowly losing charge (currently at 74%). The battery indicator says, "Plugged in, not charging". I want to bring the laptop to school but I can't because it won't be portable at all. Just to summarize it all: 1) The laptop suffered some blackouts already. 2) The laptop was on AC power most of the time. 3) When the computer froze, it was reset (hard shutdown). 4) The laptop won't boot with battery only since then. 5) The laptop will shutdown instantly when AC adapter is removed. 6) The battery won't charge and is gradually losing charge. ======================= UPDATE ============================= We got the battery replaced. Unfortunately, it delivers only 2 hours max of power.

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  • cygwin sshd fails to allocate pty for some users

    - by user115851
    I have (finally) got sshd working under cygwin on Win7 - well, sort of. The sshd runs as user 'cyg_server'. I'm able to successfully ssh to my computer using that same user name. However, if I attempt to ssh using my normal (Windows) user name, it fails trying to allocate a pty for my login session. For example, output of 'sshd -D -d -d -d' contains this .. ... debug1: Entering interactive session for SSH2. debug2: fd 4 setting O_NONBLOCK debug2: fd 5 setting O_NONBLOCK debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 debug1: input_session_request debug1: channel 0: new [server-session] debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype [email protected] want_reply 0 debug1: server_input_channel_req: channel 0 request pty-req reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req pty-req debug1: Allocating pty. debug1: session_pty_req: session 0 alloc /dev/pty1 !!! chown(/dev/pty1, 17308, 10513) failed: Invalid argument debug1: do_cleanup debug1: session_pty_cleanup: session 0 release /dev/pty1 Currently /dev is owned by my normal account. I've tried changing its ownership to cyg_server as well as SYSTEM. In both cases the problem persists. I've also changed permissions for /dev (e.g, 700 and 777) - again problem persists. [As a side note - it is strange that whenever I do 'ls -al /dev' the ptys do not show up. However, if I 'ls -l /dev/ptyX' for a pty I know to exist, it shows up. Is that normal for cygwin?] -Bob Andover, MA

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  • Why is wget so much faster than Firefox at some downloads?

    - by Earlz
    Recently, I needed to do an update of Xilinx WebPack, mind you, this is one hefty piece of software. It weighs in at 6gigs, which definitely isn't "quick" on any internet I've ever had available to me. So, when I went to download it(using Firefox of course), I was very... unsettled by the fact that the download was only going at 110kByte/s. My internet connection is capable of about 2200kByte/s download, so what gives!? My workaround in the past for this issue has been to take the link to my Linode linux server and download it there with wget, where the download will zip along at 14MByte/s, and then either copying it to my website directory and downloading it that way through HTTP, or using sftp. Both ways work about as well and will sufficiently max out my connection. However, I recently figured out the missing variable. I tried doing the download locally with wget and was able to max out my connection! TL;DR; Now, my question. Why is wget so much faster than firefox at downloading this file? I hardly ever have such a difference in download speeds except for with this one file.

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  • Apache Config: RSA server certificate CommonName (CN) ... NOT match server name?

    - by mmattax
    I'm getting this in error_log when I start Apache: [Tue Mar 09 14:57:02 2010] [notice] mod_python: Creating 4 session mutexes based on 300 max processes and 0 max threads. [Tue Mar 09 14:57:02 2010] [warn] RSA server certificate CommonName (CN) `*.foo.com' does NOT match server name!? [Tue Mar 09 14:57:02 2010] [warn] RSA server certificate CommonName (CN) `www.bar.com' does NOT match server name!? [Tue Mar 09 14:57:02 2010] [notice] Apache configured -- resuming normal operations Child processes then seem to seg fault: [Tue Mar 09 14:57:32 2010] [notice] child pid 3425 exit signal Segmentation fault (11) [Tue Mar 09 14:57:35 2010] [notice] child pid 3433 exit signal Segmentation fault (11) [Tue Mar 09 14:57:36 2010] [notice] child pid 3437 exit signal Segmentation fault (11) Server is RHEL, what's going on and what do I need to do to fix this? EDIT As requested, the dump from httpd -M: Loaded Modules: core_module (static) mpm_prefork_module (static) http_module (static) so_module (static) auth_basic_module (shared) auth_digest_module (shared) authn_file_module (shared) authn_alias_module (shared) authn_anon_module (shared) authn_default_module (shared) authz_host_module (shared) authz_user_module (shared) authz_owner_module (shared) authz_groupfile_module (shared) authz_default_module (shared) include_module (shared) log_config_module (shared) logio_module (shared) env_module (shared) ext_filter_module (shared) mime_magic_module (shared) expires_module (shared) deflate_module (shared) headers_module (shared) usertrack_module (shared) setenvif_module (shared) mime_module (shared) status_module (shared) autoindex_module (shared) info_module (shared) vhost_alias_module (shared) negotiation_module (shared) dir_module (shared) actions_module (shared) speling_module (shared) userdir_module (shared) alias_module (shared) rewrite_module (shared) cache_module (shared) disk_cache_module (shared) file_cache_module (shared) mem_cache_module (shared) cgi_module (shared) perl_module (shared) php5_module (shared) python_module (shared) ssl_module (shared) Syntax OK

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  • Debugging Samba/CUPS printer sharing with Windows

    - by mrdrbob
    I've got a HP Deskjet hooked up to a Slackware 12.2 box. I've got CUPS set up and can print a test page from the box just fine. I've also got Samba set up and have a couple file shares that work fine. I'm trying to share that HP Deskjet out via Samba, but I can't get it to show up in any Windows system. I see the server and its file shares in Windows networking, but when I open the Printers, no printer shows up. Running net view \\servername from the command line lists the file shares, but no printers. Here's the pertinent part of my smb.conf, if that helps: [global] workgroup = HOMENET security = share hosts allow = 192.168.1. 192.168.2. 127. load printers = yes printcap name = cups printing = cups log file = /var/log/samba.%m max log size = 50 [printers] comment = All Printers path = /var/spool/samba browseable = no public = yes writable = no printable = yes guest only = yes Can anyone give me some pointers as to where to start looking for potential causes? Update: Running testparm shows no errors. Here's the output (minus the file shares): [global] workgroup = HOMENET security = SHARE log file = /var/log/samba.%m max log size = 50 printcap name = cups hosts allow = 192.168.1., 192.168.2., 127. [printers] comment = All Printers path = /var/spool/samba guest only = Yes guest ok = Yes printable = Yes browseable = No

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  • graphics performance better on battery?

    - by Scott Beeson
    Anyone have any idea why my laptop would perform (considerably) better while on battery than while plugged in? It's a Dell Latitude E6420 with Windows 8 Pro. I tried mirroring all the settings in the selected power plan from "On battery" to "Plugged In" and that didn't help. I then just restored the defaults for all power plans (balanced and high performance). I'm still seeing the same results. The best example where it is most noticeable (don't laugh) is Sim City Social in Chrome. I'm probably seeing a performance increase of 5x on battery versus plugged in. This is easily reproducible too. I'm very confused. Could it be caused by dust? The laptop isn't that old and there is no visible dust. I'm not going to take it apart to check the insides as it's a corporate laptop. Could it be overheating? Battery Sim City Social: 68 degrees max Civ V: 77 degrees max Charger Sim City Social: 68 Civ V: did not test See answer below... I'm retarded

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  • Difference in performance: local machine VS amazon medium instance

    - by user644745
    I see a drastic difference in performance matrix when i run it with apache benchmark (ab) in my local machine VS production hosted in amazon medium instance. Same concurrent requests (5) and same total number of requests (111) has been run against both. Amazon has better memory than my local machine. But there are 2 CPUs in my local machine vs 1 CPU in m1.medium. My internet speed is very low at the moment, I am getting Transfer rate as 25.29KBps. How can I improve the performance ? Do not know how to interpret Connect, Processing, Waiting and total in ab output. Here is Localhost: Server Hostname: localhost Server Port: 9999 Document Path: / Document Length: 7631 bytes Concurrency Level: 5 Time taken for tests: 1.424 seconds Complete requests: 111 Failed requests: 102 (Connect: 0, Receive: 0, Length: 102, Exceptions: 0) Write errors: 0 Total transferred: 860808 bytes HTML transferred: 847155 bytes Requests per second: 77.95 [#/sec] (mean) Time per request: 64.148 [ms] (mean) Time per request: 12.830 [ms] (mean, across all concurrent requests) Transfer rate: 590.30 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.5 0 1 Processing: 14 63 99.9 43 562 Waiting: 14 60 96.7 39 560 Total: 14 63 99.9 43 563 And this is production: Document Path: / Document Length: 7783 bytes Concurrency Level: 5 Time taken for tests: 33.883 seconds Complete requests: 111 Failed requests: 0 Write errors: 0 Total transferred: 877566 bytes HTML transferred: 863913 bytes Requests per second: 3.28 [#/sec] (mean) Time per request: 1526.258 [ms] (mean) Time per request: 305.252 [ms] (mean, across all concurrent requests) Transfer rate: 25.29 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 290 297 14.0 293 413 Processing: 897 1178 63.4 1176 1391 Waiting: 296 606 135.6 588 1171 Total: 1191 1475 66.0 1471 1684

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  • Nginx Slower than Apache??

    - by ichilton
    Hi, I've just setup 2x identical Rackspace Cloud instances and am doing some comparisons and benchmarks to compare Apache and Nginx. I'm testing with a 3.4k png file and initially 512MB server instances but have now moved to 1024MB server instances. I'm very surprised to see that whatever I try, Apache seems to consistently outperform Nginx....what am I doing wrong? Nginx: Server Software: nginx/0.8.54 Server Port: 80 Document Length: 3400 bytes Concurrency Level: 100 Time taken for tests: 2.320 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 3612000 bytes HTML transferred: 3400000 bytes Requests per second: 431.01 [#/sec] (mean) Time per request: 232.014 [ms] (mean) Time per request: 2.320 [ms] (mean, across all concurrent requests) Transfer rate: 1520.31 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 11 15.7 3 120 Processing: 1 35 76.9 20 1674 Waiting: 1 31 73.0 19 1674 Total: 1 46 79.1 21 1693 Percentage of the requests served within a certain time (ms) 50% 21 66% 39 75% 40 80% 40 90% 98 95% 136 98% 269 99% 334 100% 1693 (longest request) And Apache: Server Software: Apache/2.2.16 Server Port: 80 Document Length: 3400 bytes Concurrency Level: 100 Time taken for tests: 1.346 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 3647000 bytes HTML transferred: 3400000 bytes Requests per second: 742.90 [#/sec] (mean) Time per request: 134.608 [ms] (mean) Time per request: 1.346 [ms] (mean, across all concurrent requests) Transfer rate: 2645.85 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 1 3.7 0 27 Processing: 0 3 6.2 1 29 Waiting: 0 2 5.0 1 29 Total: 1 4 7.0 1 29 Percentage of the requests served within a certain time (ms) 50% 1 66% 1 75% 1 80% 1 90% 17 95% 19 98% 26 99% 27 100% 29 (longest request) I'm currently using worker_processes 4; and worker_connections 1024; but i've tried and benchmarked different values and see the same behaviour on all - I just can't get it to perform as well as Apache and from what i've read previously, i'm shocked about this! Can anyone give any advice? Thanks, Ian

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  • Abnormally high amount of Transmit discards reported by Solarwinds for multiple switches

    - by Jared
    I have several 3750X Cisco switches that, according to our Solarwinds NPM, are producing billions of transmit discards per day. I'm not sure why it's reporting these discards. Many of the ports on the 3750X's have 2960's connected to them and are hardcoded as trunk ports. Solarwinds NPM version 10.3 Cisco IOS version 12.2(58)SE2 Total output drops: 29139431: GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is XXXX (bia XXXX) Description: XXXX MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:50, output hang never Last clearing of "show interface" counters 1w4d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29139431 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 35000 bits/sec, 56 packets/sec 51376 packets input, 9967594 bytes, 0 no buffer Received 51376 broadcasts (51376 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 51376 multicast, 0 pause input 0 input packets with dribble condition detected 115672302 packets output, 8673778028 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out sh controllers gigabitEthernet 1/0/43 utilization: Receive Bandwidth Percentage Utilization : 0 Transmit Bandwidth Percentage Utilization : 0

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  • How flexible is the 'indirect' function?

    - by Chuck
    My curiosity pushes me to ask this question. If I were to have a series of functions that referenced a different column in a worksheet but all ended on the same row of data is there a way to point the 'row' part of a cell reference to a blank cell and use it has a variable to show the results of the functions up to a desired row simultaneously? Example: =Average('worksheet 1'.$A$1:'worksheet 1'.$A100) =Max('worksheet 1'.$B$1:'worksheet 1'.$B100) =Min('worksheet 1'.$C$1:'worksheet 1'.$C100) =Sum('worksheet 1'.$D$1:'worksheet 1'.$D100) Pseudo formulas... =Average('worksheet 1'.$A$1:'worksheet 1'.$A*('worksheet 2'.$A$1)*) =Max('worksheet 1'.$B$1:'worksheet 1'.$B*('worksheet 2'.$A$1)*) =Min('worksheet 1'.$C$1:'worksheet 1'.$C*('worksheet 2'.$A$1)*) =Sum('worksheet 1'.$D$1:'worksheet 1'.$D*('worksheet 2'.$A$1)*) Where 'worksheet 2'.$A$1 would only contain a number corresponding to a row in 'worksheet 1'. After stumbling upon and playing with the indirect() function I have only been able to replace the entire cell reference (Column and Row) with any success. The formula so far =SUM('worksheet 1'.C3:INDIRECT(A1)) Where A1 is on 'worksheet 2' and contains a full cell reference pointing to 'worksheet 1'. Any pointers?

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  • mod_cache not working

    - by Pistos
    I have a PHP site that has many dynamically generated pages. I'm trying to turn to mod_cache to help boost performance, because in most cases, content does not change in a given day. I have configured mod_cache as best I could, following examples around the web, including the mod_cache page on apache.org. When I set LogLevel debug, I see a bit of information about the caching that is [not] happening. There are plenty of pairs of lines like this: [Fri Jun 01 17:28:18 2012] [debug] mod_cache.c(141): Adding CACHE_SAVE filter for /foo/bar [Fri Jun 01 17:28:18 2012] [debug] mod_cache.c(148): Adding CACHE_REMOVE_URL filter for /foo/bar Which is fine, because I've set CacheEnable disk /foo, to indicate that I want everything under /foo cached. I'm new to mod_cache, but my understanding about these lines is that it just means that mod_cache has acknowledged that the URL is supposed to be cached, but there are supposed to be more lines indicating that it is saving the data to cache, and then later retrieving them on subsequent hits to the same URL. I can hit the same URL till I'm blue in the face, whether with F5 refreshing, or not, or with different browsers, or different computers. It's always that pair of lines that shows in the logs, and nothing else. When I set CacheEnable disk /, then I see more activity. But I don't want to cache the entire site, and there are many, many different subpaths to the site, so I don't want to have to modify code to set no-cache headers in all the necessary places. I'll mention that mod_rewrite is in use here, rewriting /foo/bar to something like index.php?baz=/foo/bar, but my understanding is that mod_cache uses the pre-rewrite URL, not the post-rewrite URL. As far as I can tell, I have the response headers not getting in the way of caching. Here's an example from one hit: Cache-Control:must-revalidate, max-age=3600 Connection:Keep-Alive Content-Encoding:gzip Content-Length:16790 Content-Type:text/html Date:Fri, 01 Jun 2012 21:43:09 GMT Expires:Fri, 1 Jun 2012 18:43:09 -0400 Keep-Alive:timeout=15, max=100 Pragma: Server:Apache Vary:Accept-Encoding mod_cache config is as follows: CacheRoot /var/cache/apache2/ CacheDirLevels 3 CacheDirLength 2 CacheEnable disk /foo What is getting in the way of mod_cache doing its job of caching?

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  • Is it possible to trace the delegation path for a DNS lookup?

    - by Josh Glover
    I'm trying to determine why a Nagios host check is failing (hostnames and IPs have been changed to protect the guilty): : jmglov@laurana; host www.foo.com ;; connection timed out; no servers could be reached : jmglov@laurana; for ns in `grep -o '\([0-9]\+[.]\)\{3\}[0-9]\+$' /etc/resolv.conf`; do ping -qc 1 $ns; done PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 10.911/10.911/10.911/0.000 ms PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data. --- 192.168.1.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.241/0.241/0.241/0.000 ms So I know that my nameservers are reachable, meaning that some nameserver along the delegation path to the authoritative nameserver for my host is not responding. Is there an easy way to determine which nameserver this is (basically a traceroute for DNS)?

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  • Why can't I route to some sites from my MacBook Pro that I can see from my iPad? [closed]

    - by Robert Atkins
    I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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  • How can I configure apache to cache the images that it is serving? Right now it is giving headers t

    - by Tchalvak
    Serving up images that don't seem to cache There's a LAPP (postgresql instead of mysql) running over on http://ninjawars.net. I just recently noticed that images don't seem to be caching with any kind of good frequency as I was reloading a page with a few images on it here: http://www.ninjawars.net/attack_player.php Here is an example image (they're probably all being served exactly the same): http://www.ninjawars.net/images/characters/fighter.png Checking the header, it seems that the caching is set to: Cache-Control:max-age=0 (the full header for this image-like-all-the-others is... Request URL:http://www.ninjawars.net/images/characters/fighter.png Request Method:GET Status Code:200 OK Request Headers Accept:application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,/;q=0.5 Cache-Control:max-age=0 Referer:http://www.ninjawars.net/images/characters/fighter.png User-Agent:Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.3 Safari/533.4 Response Headers Accept-Ranges:bytes Content-Length:938 Content-Type:image/png Date:Thu, 13 May 2010 21:24:07 GMT ETag:"ffd4d-3aa-4837efc120540" Last-Modified:Mon, 05 Apr 2010 15:28:45 GMT Server:Apache ) So what modules or config or htaccess or whatever do I change to have it cache images, e.g. for 24 hours?

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  • tap interfaces always disabled in linux bridge

    - by Dani Camps
    I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig tap0 up ifconfig tap1 up #Create the bridge brctl addbr br0 brctl stp br0 off brctl addif br0 eth0 brctl addif br0 tap0 brctl addif br0 tap1 #Turning up the bridge ifconfig br0 up However my problem if that the tap interfaces always appear disabled in the bridge, and no traffic flows to them. $brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.080027cabeba no eth2 tap0 tap1 $brctl showstp br0 br0 bridge id 8000.080027cabeba designated root 8000.080027cabeba root port 0 path cost 0 max age 20.00 bridge max age 20.00 hello time 2.00 bridge hello time 2.00 forward delay 15.00 bridge forward delay 15.00 ageing time 300.01 hello timer 0.00 tcn timer 0.00 topology change timer 0.00 gc timer 298.42 flags eth2 (1) port id 8001 state forwarding designated root 8000.080027cabeba path cost 4 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8001 forward delay timer 12.97 designated cost 0 hold timer 1.24 flags tap0 (2) port id 8002 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags tap1 (3) port id 8003 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8003 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags Is there any way to set the tap interfaces in forwarding state? I do not understand why they are not because STP is disabled. Cheers Daniel

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  • How to setup Python with Lighttpd and FastCGI (like PHP)

    - by johndir
    Running Lighttpd on Linux, I would like to be able to execute Python scripts just the way I execute PHP scripts. The goal is to be able to execute arbitrary script files stored in the WWW directory, e.g. http://www.example.com/*.py. I would not like to spawn a new Python instance (interpreter) for every request (like done in regular CGI, if I'm not mistaken), which is why I'm using FastCGI. Following Lighttpd's documentation, the following is the FastCGI part of my config file. The problem is that it always runs the /usr/local/bin/python-fcgi script for every *.py file, regardless of the content of that file: http://www.example.com/script.py [output=>] "python-fcgi: test" (regardless of the content of script.py) I'm not interested in using any framework, but simply executing individual [web] scripts. How can I make it act like PHP, executing any script in the WWW directory by requesting it's path? /etc/lighttpd/conf.d/fastcgi.conf: server.modules += ( "mod_fastcgi" ) index-file.names += ( "index.php" ) fastcgi.server = ( ".php" => ( "localhost" => ( "bin-path" => "/usr/bin/php-cgi", "socket" => "/var/run/lighttpd/php-fastcgi.sock", "max-procs" => 4, # default value "bin-environment" => ( "PHP_FCGI_CHILDREN" => "1", # default value ), "broken-scriptfilename" => "enable" ) ), ".py" => ( "python-fcgi" => ( "socket" => "/var/run/lighttpd/fastcgi.python.socket", "bin-path" => "/usr/local/bin/python-fcgi", "check-local" => "disable", "max-procs" => 1, ) ) ) /usr/local/bin/python-fcgi: #!/usr/bin/python2 def myapp(environ, start_response): start_response('200 OK', [('Content-Type', 'text/plain')]) return ['python-fcgi: test\n'] if __name__ == '__main__': from flup.server.fcgi import WSGIServer WSGIServer(myapp).run()

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  • Cache-control for permanent 301 redirects nginx

    - by gansbrest
    I was wondering if there is a way to control lifetime of the redirects in Nginx? We would liek to cache 301 redirects in CDN for specific amount of time, let say 20 minutes and the CDN is controlled by the standard caching headers. By default there is no Cache-control or Expires directives with the Nginx redirect. That could cause the redirect to be cached for a really long time. By having specific redirect lifetime the system could have a chance to correct itself, knowing that even "permanent" redirect change from time to time.. The other thing is that those redirects are included from the Server block, which according the nginx specification should be evaluated before locations. I tried to add add_header Cache-Control "max-age=1200, public"; to the bottom of the redirects file, but the problem is that Cache-control gets added twice - first comes let say from the backend script and the other one added by the add_header directive.. In Apache there is the environment variable trick to control headers for rewrites: RewriteRule /taxonomy/term/(\d+)/feed /taxonomy/term/$1 [R=301,E=expire:1] Header always set Cache-Control "store, max-age=1200" env=expire But I'm not sure how to accomplish this in Nginx.

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  • FreeRADIUS Default Answer

    - by jinanwow
    We are using FreeRADIUS with a MySQL database, authenticating users. We ran into an issue where are MySQL database was slow causing the max number of threads to be reached. The issue with this is, when the server couldn't answer the requests as there were no threads avaiable, it sent the response of Access-Reject to the clients. Our devices cache client connections and periodically checks with the server to see if they should still be allowed or to remove them. The equipment is designed that if there is no response from the server and a client is connected it will remain connected. The issue is, when the radius server is at its max threads, its default answer is to send access-reject (verified via packet capture), however we would like to change the default behavior to just ignore the request (keeping the clients connected). We have fixed the MySQL database issue for now, but I would like to change the default from Access-Reject, to just ignore the client altogeather. I have done research, but not able to find an answer to the question. Thanks in Advance.

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  • Server 2012, Jumbo Frames - should I expect problems?

    - by TomTom
    Ok, this sound might stupid - but is there any negative on just enabling jumbo frames in practice? From what I understand: Any switch or ethernet adapter that sees a jumbo frame it can not handle will just drop it. TCP is not a problem as max frame size is negotiated in the setinuo phase. UCP is a theoretical problem as a server may just send a LARGE UDP packet that gets dropped on the way. Practically though, as UDP is packet based, I do not really think any software WOULD send a UDP packet larger than 1500 bytes net without app level configuration changes - at least this is how I do my programming, as it is quite hard to get a decent MTU size for that without testing yourself, so you fall back in programming to max 1500 packets. The network in question is a standard small business network - we upgraded now from a non managed 24 port switch to a 52 port switch with 4 10g ports (netgear - quite cheap) and will mov a file server to 10g for also ISCSI serving. All my equipment on the Ethernet level can handle minimum 9000 bytes and due to local firewalls I really want to get packets larger (less firewall processing), but the network is also NAT'ed to the internet. On top, different machines move around (download) large files (multi gigabyte area) quite often for processing. The question is - can I expect problems when I just enable jumbo frames? Again, this is not totally ignorance - I just don't see programs sending more than 1500 byte UDP packets (if that is a practical problem please tell me) and for TCP the MTU is negotiated anyway. if there is a problem I can move to a dedicated VLAN, but this has it's own shares of problems as basically most workstations must then be on both VLAN's.

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  • Why I cannot copy install.wim from Windows 7 ISO to USB (in linux env)

    - by fastreload
    I need to make a USB bootable disk of Windows 7 ISO. My USB is formatted to NTFS, ISO is not corrupt. I can copy install.wim elsewhere but I cannot copy it to USB. I even tried rsync. rsync error sources/install.wim rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32) rsync: write failed on "/media/52E866F5450158A4/sources/install.wim": Input/output error (5) rsync error: error in file IO (code 11) at receiver.c(322) [receiver=3.0.8] Stat for windows.vim File: `X15-65732 (2)/sources/install.wim' Size: 2188587580 Blocks: 4274600 IO Block: 4096 regular file Device: 801h/2049d Inode: 671984 Links: 1 Access: (0664/-rw-rw-r--) Uid: ( 1000/ umur) Gid: ( 1000/ umur) Access: 2011-10-17 22:59:54.754619736 +0300 Modify: 2009-07-14 12:26:40.000000000 +0300 Change: 2011-10-17 22:55:47.327358410 +0300 fdisk -l Disk /dev/sdd: 8103 MB, 8103395328 bytes 196 heads, 32 sectors/track, 2523 cylinders, total 15826944 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc3072e18 Device Boot Start End Blocks Id System /dev/sdd1 * 32 15826943 7913456 7 HPFS/NTFS/exFAT hdparm -I /dev/sdd: SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ATA device, with non-removable media Model Number: UF?F?A????U]r???U u??tF?f?`~ Serial Number: ?@??~| Firmware Revision: ????V? Media Serial Num: $I?vnladip raititnot baelErrrol aoidgn Media Manufacturer: o eparitgns syetmiM Standards: Used: unknown (minor revision code 0x0c75) Supported: 12 8 6 Likely used: 12 Configuration: Logical max current cylinders 17218 0 heads 0 0 sectors/track 128 0 -- Logical/Physical Sector size: 512 bytes device size with M = 1024*1024: 0 MBytes device size with M = 1000*1000: 0 MBytes cache/buffer size = unknown Capabilities: IORDY(may be)(cannot be disabled) Queue depth: 11 Standby timer values: spec'd by Vendor R/W multiple sector transfer: Max = 0 Current = ? Recommended acoustic management value: 254, current value: 62 DMA: not supported PIO: unknown * reserved 69[0] * reserved 69[1] * reserved 69[3] * reserved 69[4] * reserved 69[7] Security: Master password revision code = 60253 not supported not enabled not locked not frozen not expired: security count not supported: enhanced erase 71112min for SECURITY ERASE UNIT. 172min for ENHANCED SECURITY ERASE UNIT. Integrity word not set (found 0xaa55, expected 0x80a5)

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