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• Monitor a log file on Linux and send each line to another program

  - by mlambie

  I run an apt-cacher-ng server on Ubuntu Linux which writes logs in the following format: 1299745593|O|149406|XXX.XXX.XXX.XXX|uburep/pool/main/t/tiff/libtiff4_3.9.2-2ubuntu0.4_amd64.deb 1299745593|O|10154976|XXX.XXX.XXX.XXX|uburep/pool/main/l/linux-firmware/linux-firmware_1.34.4_all.deb 1299748529|O|39368|XXX.XXX.XXX.XXX|uburep/pool/main/n/nagios-nrpe/nagios-nrpe-server_2.12-4ubuntu1_amd64.deb 1300155440|O|680100|XXX.XXX.XXX.XXX|uburep/pool/main/t/tzdata/tzdata_2011c-0ubuntu0.10.04_all.deb It shows the timestamp, direction (in or out), byte count, IP and filename. Every time a line is written to it, I'd like to also send that line to another program. I will have this program insert the line into a database so that I can crunch some statistics about how much bandwidth we're saving through operating a caching server. I do not want to cat the log file every X minutes (via cron) looking for new entries as it'd be somewhat computationally uneconomical. Instead I'd prefer to have a daemon monitor the log, and when a change is detected, each line is sent to my database-insertion script. Will swatch achieve this, or are there better options?

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• Caching DNS server (bind9.2) CPU usage is so so so high

  - by Gk.

  I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• iis php internal server error

  - by user1633206

  I developed a website, using php/mysql running at IIS Server as CGI Server API. Suddenly it gives me error 500 after two weeks. It has lot of scripts but index.php home is working. But other script that has header redirection What's wrong with my scripts. livehttp addon of firefox says.. GET /allplans.php?lang=ar&cat=1 HTTP/1.1 Host: www.myhost.com... [edited] User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1 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 Connection: keep-alive Cache-Control: max-age=0 HTTP/1.1 500 Internal Server Error Content-Type: text/html Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET Date: Mon, 03 Sep 2012 08:09:13 GMT Content-Length: 1208 Connection: Keep-Alive

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• configuring cgi-bin using .htaccess

  - by Alexandru

  I'm trying to configure a directory as cgi-bin using .htaccess, but when I try to access the executables, the files are downloaded. I'm using apache2.2. What is the problem? My .htaccess looks like: # cat www/cgi-bin/.htaccess Options +ExecCGI AddHandler cgi-script cgi pl File permissions are # ls -1la www/cgi-bin/ total 60 drwxr-xr-x 2 root root 4096 iun 10 19:22 . drwxr-xr-x 5 root root 4096 iun 10 19:18 .. -rw-r--r-- 1 root root 46 iun 10 19:23 .htaccess -rwxr-xr-x 1 root root 15358 iun 10 19:23 paperload.cgi -rwxr-xr-x 1 root root 12728 iun 10 19:23 papers.cgi -rwxr-xr-x 1 root root 12593 iun 10 19:23 paperview.cgi

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• /proc/pid/environ missing variables

  - by Josh Arenberg

  google is giving no love on this one today, so I turn to the experts... I'm currently hacking together a script that relies on the /proc/pid/environ feature in Linux (RHEL 4) to check for a particular environment variable. Trouble is, it seems certain environment variables aren't showing up in there for some reason. Example: create some test vars: $ export T_1=testval TEST_1=testval T=testval TESTING_LONGEST=testval open a subshell: $bash $ cat /proc/self/environ|tr "\0" "\n"|grep testval TESTVARIABLE_LONGEST=testval T=testval hmm... where did T_1 and TEST_1 go?? what rules govern this strange universe? Thanks in advance, Josh

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• yum install gcc fails with invalid linux.dropbox.com/fedora directory

  - by john

  I am relatively new to Linux administration. I have installed Centos 6.5 (under VirtualBox on a Win7pro system). When I try to install gcc to the system using yum, I get the following results: [root@localhost etc]# yum clean all Loaded plugins: fastestmirror, refresh-packagekit, security Cleaning repos: Dropbox base extras updates Cleaning up Everything Cleaning up list of fastest mirrors [root@localhost etc]# yum install gcc Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors * base: mirrors.tummy.com * extras: mirrors.cat.pdx.edu * updates: centos.mirror.freedomvoice.com http://linux.dropbox.com/fedora/6/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again It appears that the linux.dropbox.com/fedora/6 subdirectory does not exist. Does anyone have any ints/answers for me. Thanks.

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• How to suppress "Not collecting exported resources without storeconfigs"?

  - by Andy Shinn

  I'm getting the following in my Puppet master syslog over and over: Sep 27 11:52:05 puppet1 puppet-master: Not collecting exported resources without storeconfigs Sep 27 11:52:06 puppet1 puppet-master: Not collecting exported resources without storeconfigs Sep 27 11:52:06 puppet1 puppet-master: Not collecting exported resources without storeconfigs I'm not actually using storeconfigs: [ashinn@puppet1 ~]$ cat /etc/puppet/puppet.conf [agent] server = puppet.mydomain.com environment = production report = true [main] logdir = /var/log/puppet vardir = /var/lib/puppet ssldir = /var/lib/puppet/ssl rundir = /var/run/puppet factpath = $vardir/lib/facter pluginsync = true certname = puppet1.mydomain.com [master] modulepath = $confdir/environments/$environment/modules manifest = $confdir/environments/$environment/manifests/site.pp templatedir = $confdir/templates autosign = $confdir/autosign.conf ssl_client_header = SSL_CLIENT_S_DN ssl_client_verify_header = SSL_CLIENT_VERIFY report = true reports = hipchat Any way I can suppress these messages? What do they actually come from?

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• Retrieve malicious IP addresses from Apache logs and block them with iptables

  - by Gabriel Talavera

  Im trying to keep away some attackers that try to exploit XSS vulnerabilities from my website, I have found that most of the malicious attempts start with a classic "alert(document.cookie);\" test. The site is not vulnerable to XSS but I want to block the offending IP addresses before they found a real vulnerability, also, to keep the logs clean. My first thought is to have a script constantly checking in the Apache logs all IP addresses that start with that probe and send those addresses to an iptables drop rule. With something like this: cat /var/log/httpd/-access_log | grep "alert(document.cookie);" | awk '{print $1}' | uniq Why would be an effective way to send the output of that command to iptables? Thanks in advance for any input!

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• Centos + CPanel results in php always running as fgci, instead of cli, as expected

  - by quamis

  I'm having problems with a server configured by someone else. It uses CPanel, and it has Apache+PHP. For some reason, when running php -v as a user, i get "cli" as handler # php -v | head -n 1 PHP 5.3.27 (cli) (built: Oct 15 2013 16:06:48) If a make a PHP script with echo shell_exec("php -v | tail -n 1"), i get PHP 5.3.27 (cgi-fcgi) (built: Oct 15 2013 16:22:16) Why the cli/fcgi difference? I need to fix this so that scripts ran by the apache user would be running as "cli", not "fcgi". As a side-note, i'm not sure how php got installed, because in the package list i see another version installed, instead of the pne reported by php -v # rpm -qa | grep php [.... other packages...] cpanel-php53-5.3.17-5.cp1136.x86_64 rebuild_phpconf --current: /usr/local/cpanel/bin/rebuild_phpconf --current Available handlers: suphp dso fcgi cgi none DEFAULT PHP: 5 PHP4 SAPI: none PHP5 SAPI: dso SUEXEC: enabled RUID2: not installed redhat-release: # cat /etc/redhat-release CentOS release 6.4 (Final) possibly related to http://superuser.com/questions/665809/centos-6-4-running-php-for-root-as-cgi-fcgi-not-cli

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• Syntax for piping varnish logs to rotatelogs

  - by jetboy

  Ubuntu 12.04 Server x64, Varnish 3.0.2 I'm trying to pipe varnishncsa's logs through Apache's rotatelogs, and running from the shell, things work fine: sudo varnishncsa -a -P /var/run/varnishncsa/varnishncsa.pid |/usr/sbin/rotatelogs /var/log/varnish/varnish.log.%Y%m%d%H 3600 creates a new logfile in /var/log/varnish, with rotation every hour (3600 seconds). However, I'm struggling to get things working the same way inside /etc/init.d/varnishncsa: PATH=/sbin:/bin:/usr/sbin:/usr/bin DAEMON=/usr/bin/$NAME PIDFILE=/var/run/$NAME/$NAME.pid LOGFILE=/var/log/varnish/varnishncsa.log USER=varnishlog DAEMON_OPTS="-a -P ${PIDFILE}" DAEMON_PIPE="|/usr/sbin/rotatelogs /var/log/varnish/varnish.log.%Y%m%d%H 3600" ... start_varnishncsa() { output=$(/bin/tempfile -s.varnish) log_daemon_msg "Starting $DESC" "$NAME" create_pid_directory if start-stop-daemon --start --verbose --pidfile ${PIDFILE} \ --chuid $USER --exec ${DAEMON} -- ${DAEMON_OPTS} \ > ${output} 2>&1; then log_end_msg 0 else log_end_msg 1 cat $output exit 1 fi rm $output } Where should I put DAEMON_PIPE in the above code? I've tried at the end of: if start-stop-daemon --start --verbose --pidfile ${PIDFILE} which is where additional command line parameters usually go, but it isn't creating a logfile.

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• Where to find URLs for sources.list for debian for running apt-get update?

  - by Boda Cydo

  Can anyone tell me where to find URLs to put in /etc/apt/sources.list for debian so that I could run apt-get update? I couldn't find the precise answer by searching Google. When I currently try running apt-get update I get: W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/contrib/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/non-free/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] I have no idea how to solve this. Here is how my current sources.list looks like: deb ftp://ftp.debian.org/debian lenny main contrib non-free deb-src ftp://ftp.debian.org/debian lenny main contrib non-free deb ftp://ftp.debian.org/debian lenny/updates main contrib non-free deb-src ftp://ftp.debian.org/debian lenny/updates main contrib non-free I'm running debian_version 5.0.8: # cat /etc/debian_version 5.0.8 Thanks!

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• upstart not working

  - by dorelal

  I saved the following file at /etc/init/nodejs.conf description "node.js server" author "dorelal" start on startup stop on shutdown script # We found $HOME is needed. Without it, we ran into problems export HOME="/root" exec /usr/local/bin/node /home/dorelal/nodejs.js 2>&1 >> /var/log/node.log end script Then I tried to start the server > sudo initctl start nodejs initctl: Unknown job: nodejs Ubuntu information > cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" What do I need to do to start the server using upstart.

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• Write to stdin of a running process using pipe

  - by aditya

  I am in a similar situation as in this post But I couln't get the solution provided there to work in my situation as the answer seems related to that question only. In particular, I couldnt understand what was the purpose of cat my.fifo | nc remotehost.tld 10000 In my case, I have a process running and waiting for input. how can I send input to that process using named pipes? I've tried echo 'h' > /proc/PID/fd/0 it just displays 'h' on the process' window.

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• Can't ping static IP from internal network, only from outside

  - by Mike

  I'm running ubuntu and I have apache running, however, I can't ping internally to my static IP nor browse http://207.40.XXX.XX the web server using my static IP. I can only ping/browse localhost, 127.0.0.1, and 192.168.0.120 OR 207.40.XXX.XX only from the outside world. # cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 my-server.myhost.com my-server # hostname my-server # netstat -tapn tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:29754 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN Any ideas why this is not working?

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• How do I connect to my home's primary wired network through an extra (wireless) router?

  - by Matthew Patrick Cashatt

  Thanks for looking! I have set up a desktop PC in my workshop. The Cat 5 cable connects from this PC to a wireless router which is connected to my home network. The Internet connection is working just fine. However, the "wired" network this is on shows up as a different wired network than the one that the PCs inside my house are connected to. This is a problem because I would like to connect this workshop PC to various shared resources like printers, HD Homerun (cable tv card), shared drives, etc. When I go to "Network and Sharing" and attempt to find the network that the PCs inside my home are connected to, I don't see it. Any help is appreciated. Thanks!

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• Building a network at home, what cables to use (if any)?

  - by Faruz

  My house is currently in ruins and am building it. While doing so, I wanted to design a home network. My main objectives are surfing and HD streaming. The house is one-level, 100 sq/m (about 300 sq/ft), and one of the rooms is a safety room with Reinforced concrete walls. About a year ago, when I started planning, I thought about putting Cat 6 STP cables in the walls and create network points in the rooms. Should I use STP or FTP? I heard that STP is a problem regarding connectors and stuff. Is it really beneficial? Will it work OK if I transfer the wire together with the telephone line? Should I maybe go with WLan and count on 802.11n to enable me to stream HD across the house? is 802.11n that good?

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• dig gets the right result from DNS server, but name still fails to resolve

  - by EMiller

  Under what conditions would the following occur? From a given OSX machine on an internal network: $~ cat /etc/resolv.conf nameserver 10.102.120.7 nameserver 10.102.120.2 From the same machine: $~ dig @10.102.120.7 in.local <snip> ... ;; QUESTION SECTION: ;in.local. IN A ;; ANSWER SECTION: in.local. 43200 IN A 10.102.123.30 <snip> ... And yet, this workstation cannot ping in.local, nor load pages hosted by apache on that machine. 10.102.123.30 is definitley up (2 OSX machines I know fail to resolve in.local - but other machines on the network can). I have also checked their /etc/hosts to see if anything there might interfere... Not sure what else to check...

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• How do I read multiple lines from STDIN into a variable?

  - by The Wicked Flea

  I've been googling this question to no avail. I'm automating a build process here at work, and all I'm trying to do is get version numbers and a tiny description of the build which may be multi-line. The system this runs on is OSX 10.6.8. I've seen everything from using CAT to processing each line as necessary. I can't figure out what I should use and why. Attempts read -d '' versionNotes Results in garbled input if the user has to use the backspace key. Also there's no good way to terminate the input as ^D doesn't terminate and ^C just exits the process. read -d 'END' versionNotes Works... but still garbles the input if the backspace key is needed. while read versionNotes do echo " $versionNotes" >> "source/application.yml" done Doesn't properly end the input (because I'm too late to look up matching against an empty string).

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• Netcat UDP File Transfer Between Two Servers Times Out?

  - by Mark Bowytz

  I'm testing file transfer speeds between two Red Hat servers that are connected to the same switch within the data center and I decided to use netcat to eliminate protocol overhead as much as possible. Testing in TCP mode went well and I was wondering how UDP might fare. On my receiving (client) end, I ran this: nc -u -l 11225 -v > myfile.out And then on the sending (server) end I ran the following: cat myfile.out | nc -u myserver.foo.zzz.com 11225 -v The file I'm testing with is 38 GB but the transfer seems to stop at around 15 GB (one time at 14.9, another at 15.6). I've tested by adding a "-w 5000" just in case it's timing out but no joy. Adding the -v doesn't show anything except acknowledging that the connection occurred. No errors. So - any suggestions as to why would the transfer cease?

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• modprobe not found at all

  - by timmeyh

  I know that a lot of people had problems finding modprobe which was mostely due to an unconfigured $PATH. This time however I logged into a machine (Linux mymachine 2.6.32-6-pve #1 SMP Mon Jan 23 08:27:52 CET 2012 i686 GNU/Linux with root rights) and modprobe wasn't found at all. This are the steps I have taken so far: - which modprobe => no results - locate modprobe => no results - my $PATH = /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11: - find / -name "modprobe*" => /proc/sys/kernel/modprobe - cat /proc/sys/kernel/modprobe => /sbin/modprobe - /sbin/modprobe => no such file or directory Ass you can see no modprobe at all. Does anyone else has a suggestion/ sollution so I can use modprobe?

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• Checking version of Applications installed in ~/Applications with unknown username

  - by ridogi

  I'd like to check the version of Firefox through Apple Remote Desktop of all managed computers. I have written this, but it only checks for Firefox in /Applications /bin/cat /Applications/Firefox.app/Contents/Info.plist | grep -A 1 CFBundleShortVersionString | grep string | sed 's/[/]//' | sed 's/<string>//g' For standard users Firefox auto update breaks if it is in /Applications so I instead have it installed in ~/Applications I'd like to check that copy (if it exists), but I can't specify the path in the command since it is unique to each computer. For example: /Users/jon/Applications/Firefox.app /Users/arya/Applications/Firefox.app Presumably I want to use find and pipe the result to my command. This should work for 10.6 through 10.8

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• How to get the spec of a machine on Linux?

  - by machinePurchaser

  I am interested in getting the spec of a machine, because I am thinking getting a similar server. What I am mostly interested in knowing is the number of cores / CPUs / etc., the amount of memory, the speed of the CPUs, the CPU cache size, and any other detail which is important for performance. My question is two-fold: Which parameters should I be interested in other than the ones I specified above? Is there an easy way to read them off the machine in Linux? cat /proc/cpuinfo reveals a lot about the CPUs, for example... What about memory (would rather not rely on top), etc?

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• Free / Cached / Available memory on Linux

  - by pkoraca

  I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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• How to configure a Logitech USB headset on Fedora 14 [closed]

  - by Humble Debugger

  I have a Logitech USB headset http://www.amazon.com/gp/product/B003NREDG4 but I can't hear anything nor input anything through it. I am working on a Fedora 14 desktop. cat /proc/asound/cards 0 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfebdc000 irq 51 2 [Headset ]: USB-Audio - Logitech USB Headset Logitech Logitech USB Headset at usb-0000:00:1d.0-2, full speed /sbin/lsmod | grep -c snd 14 lsusb Bus 008 Device 002: ID 046d:c529 Logitech, Inc. Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 004: ID 046d:0a0b Logitech, Inc. ClearChat Pro USB Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Please advise

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• Why doesn't postfix use my smtp_generic_maps?

  - by RichardTheKiwi

  What have I set up incorrectly? >postconf -n .... smtp_generic_maps = regexp:/etc/postfix/rewrite .... >cat /etc/postfix/rewrite /.*/ [email protected] >echo "test" | mail -s "test" [email protected] >tail -f /var/log/mail.log Dec 8 05:56:01 xxxxxxxxxxxx postfix/pickup[20227]: E9272709284: uid=501 from=<yyyy> Dec 8 05:56:01 xxxxxxxxxxxx postfix/cleanup[20270]: E9272709284: message-id=<[email protected]> Dec 8 05:56:01 xxxxxxxxxxxx postfix/qmgr[20228]: E9272709284: from=<[email protected]>, size=331, nrcpt=1 (queue active) Dec 8 05:56:03 xxxxxxxxxxxx postfix/smtp[20272]: E9272709284: to=<[email protected]>, relay=mailinator.com[72.51.33.80]:25, delay=1.1, delays=0.02/0.01/0.48/0.58, dsn=2.0.0, status=sent (250 Ok) FYI, I have reloaded postfix many times sudo postfix reload Note: This is on OSX 10.7.5

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