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  • I do not understand -printf script

    - by jerzdevs
    I have taken over the responsibility of RHLE5 scripting and I've not had any training in this platform or BASH scripting. There's a script that has multiple pieces to it and I will ask only about the second piece but also show you the first, I think it will help with my question below. The first part of the script shows the output of users on a particular server: cut -d : -f 1 /etc/passwd The output will look something like: root bin joe rob other... The second script requires me to fill in each of the accounts listed from the above script and run. From what I can gather, and from my search on the man pages and other web searches, it goes out and finds the group owner of a file or directory and obviously sorts and picks out just unique records but not really sure - so that's my question, what does the below script really do? (The funny thing is, is that if I plug in each name from the output above, I'll sometimes receive a "cannot find username blah, blah, blah" message.) find username -printf %G | sort | uniq

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  • How do I reduce RAM usage on my server?

    - by Abs
    I have recently launched a site that is very popular but I am having trouble with scalability. My site makes heavy use of FFmpeg and at peak times RAM usage hits the 2 GB point quickly and the swap file starts getting used. CPU usage starts rising too. Users complain that the site is slow. They say this because all FFmpeg instances run very slow because of the number running at the same time. Users make use of FFmpeg on my server in real time. Is there anything I can consider or do to ease down the usage of the server and RAM just shooting up? Maybe there is something better than FFmpeg (!). Is the only solution "throwing some cash" at a more powerful server? I have given little information, please ask for more, so this problem can be solved.

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  • 2.6.9 Kernel on virtual server (non upgradable) - any expected problems?

    - by chris_l
    Hi, I'm considering to rent a virtual server (for me personally). The product I'm currently looking at offers IMO fair pricing, very good hardware etc. The only problem is, that I won't be able to do an upgrade to a newer kernel than 2.6.9 (running Debian Etch). Also, I can't install my own kernel modules. (The server runs with Virtuozzo, so as far as I understand it, it just does some chroot instead of a real virtualization (?)) I want to run GlassFish, Postgres, Subversion, Trac and maybe some other things on it. It will also have to employ a firewall, and provide OpenSSL for https. Ideally, it would also be able to do AIO (asynchronous IO), which could speed up some server I/O. Should I expect problems with that old kernel version, in conjunction with the software I want to install (I'd like to use current versions of the software)? One thing I already found out, is that you can't do everything with iptables, since some kernel modules are missing/things are not build into the kernel. GlassFish v3 appears to run fine at first glance. I was able to test the server for a few hours. Installing my whole setup wasn't feasible in that time, but what I can say is, that it's amazingly fast for an entry-level vserver, especially hard disk and network performance (averaging at ca. 400MBit/s). So if the kernel won't be a problem, I'd really like to take it. Thanks, Chris PS Exact kernel version: 2.6.9-023stab051.3-smp

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  • Java kills sound on Karmic

    - by hasen j
    Every time I run a java application, one of two things happen: Either I lose sound in all other programs (even after quitting the java app) or if some other application is already playing sound, the said java app doesn't have sound Usually this can be fixed by running pulseaudio --kill from the command line, but it doesn't always work. Is there a way to fix this problem? This didn't happen before the upgrade to karmic. Other info: The java I'm using is Sun's Java

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  • why is this happening?-"dhcpcd will not work correctly unless run as root"

    - by user330317
    i have installed archlinux and gnome on virtualbox. had no problem connecting to internet but now after installing gnome and rebooting there is no internet connection after following instructions from archwiki,i have tried . but i cant figure out the problem please help. host-63drhd% sudo netctl status enp0s3 ? [email protected] - Networking for netctl profile enp0s3 Loaded: loaded (/usr/lib/systemd/system/[email protected]; static) Active: inactive (dead) Docs: man:netctl.profile(5) host-63drhd% sudo netctl enable enp0s3 Profile 'enp0s3' does not exist or is not readable host-63drhd% sudo dhcpcd dhcpcd[1486]: sending commands to master dhcpcd process host-63drhd% dhcpcd dhcpcd[1543]: control_open: Permission denied dhcpcd[1543]: dhcpcd will not work correctly unless run as root dhcpcd[1543]: open `/run/dhcpcd.pid': Permission denied dhcpcd[1543]: control_start: Permission denied dhcpcd[1543]: version 6.3.2 starting dhcpcd[1543]: enp0s3: if_init: Permission denied dhcpcd[1543]: enp0s8: if_init: Permission denied dhcpcd[1543]: no valid interfaces found dhcpcd[1543]: no interfaces have a carrier dhcpcd[1543]: forked to background, child pid 1544

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  • Edit write-protected files by breaking hard links

    - by Taymon
    A directory which I own and can write to contains hard links to files that I don't own and don't have write permission for. I want to open and edit these files in Emacs. When I save my changes, Emacs should rename the existing hard link by appending ~, then write my new version of the file as a new file owned by me. I was under the impression that Emacs could just do this (because of the way it does backups), but it's not working; when I save, it attempts to change the file's permissions in order to write to it (and fails because I don't own the file). How do I make this happen?

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  • mysql disk io keeps increasing ... is that normal?

    - by trustfundbaby
    So I've been trying to figure out this disk IO problem I have been having with my linode VPS. Over the last day or two I've just left watch -n1 pidstat -d running in a console window and the output looks like this: Monitoring it over the last few days, I've noticed that my problem lies with the init, searchd, and mysql processes. Searchd is sphinx and all its indexes are on disk, so disk io there is inevitable (apparently). What I can't understand is why the disk reads (kB_rd/s) for mysql refuse to stabilize and just keep going up. It started out at 154 yesterday and is up to what you see in that screen shot. but disk writes (kB_wr/s) have remained pretty constant the entire time. My VPS only has 768MB RAM, my mysql db has a size of about 220MB and after running mysqltuner.pl and reading a bit about it, I've been advised to set my innodb_buffer_pool_size to 220MB but I simply cannot afford to do that ... I have it up to 150MB. My question is twofold. Why does the init process have that much disk reading to do? Why is mysql doing so much disk reading?

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  • putty 0.61 : why do I see "Access Denied" message after I enter my login id?

    - by anjanbacchu
    I use putty to login to my RHEL 5.3 server. I'm prompted to enter my login as "login as " and I enter my login Id. as soon as I press ENTER, I see a "Access Denied" message following which I'm prompted with password. I successfully enter password and I'm through -- no problems. I tried the same with putty 0.60(as opposed to above putty 0.61) but in this version, I don't get any "access denied" error. What should I make of this ? Is putty 0.61 version buggy ? P.S : If I login using ssh.exe(from cygwin), then I'm fine -- I don't get any "access denied" errors. Thank you,

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  • Remove folder structure from archive, ignore folder while archiving and fix error

    - by Michael
    I am trying to make a script to backup each of my plesk hosts to individual files, I am having two problems: I would like to remove the folder structure from archive, the tar is 3 folders deep I am getting this error: tar: Removing leading `/' from member names I need my archive to ignore folders named "catch" because I don't need them in my archive. The code: FILES=/var/www/vhosts/* FNAME="" for f in $FILES do FNAME=`basename $f` tar cfv "/root/backup/ftp/$FNAME.tar" $f done Sample output: tar: Removing leading `/' from member names /var/www/vhosts/mydomain.com/ /var/www/vhosts/mydomain.com/conf /var/www/vhosts/mydomain.com/etc/ /var/www/vhosts/mydomain.com/etc/group /var/www/vhosts/mydomain.com/etc/termcap /var/www/vhosts/mydomain.com/etc/passwd /var/www/vhosts/mydomain.com/usr/

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  • Avoid putty ssh terminal to crash when disconnecting from server

    - by JBoy
    I'm connecting via ssh to a remote 'live' server where i have some bash scripts automated via the crontab, when an error happens in some of the automation scripts within the server, the connection to the server is killed, this is fine to me, but the problem is that Putty closes the entire window, which is a behavior i don't want. I have checked all around the web, unfortunately the putty site does not have a support page, but nothing. Under putty's option i have tried all the menus expanding all options, but still i cant find the right one, i would expect it to be under Windowbehaviour Do you have an advice? Thx

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  • Use test to check for condition with find and execdir option

    - by slosd
    I think I can keep my question short. Why does the following command produce no output? find /usr/share/themes -mindepth 1 -maxdepth 1 -type d -execdir test -d {}/gnome-shell \; I expected it to print all folders in /usr/share/themes that contain a folder gnome-shell. Several websites suggest that this usage of test as a command in exec/execdir is possible. From man find: -exec command ; Execute command; true if 0 status is returned. [...]

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  • Should we regularly schedule mysqlcheck (or databsae optimization)

    - by scatteredbomb
    We run a forum with some 2 million posts and I've noticed that if left untouched the overhead in the mySQL (as listed in phpMyAdmin) can get quite large (hundreds of megabytes). I'm wondering if scheduling a normal mysqlcheck to optimize the tables is good practice? Any reason not to do it, say, once a week at an off-peak hour? There was a time over the summer where our site was constantly crashing because mysql was using up all resources. That's when I noticed the huge amount of overhead and optimized the database and haven't had any problems since then with stability. I figured if that was helping alleviate the issues, I should just setup a cron to automatically do this.

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  • What means empty iptables?

    - by Memochipan
    I'm using CentOS and when type the command: iptables -L -v The output is as follows: Chain INPUT (policy ACCEPT 19614 packets, 2312K bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 13881 packets, 32M bytes) pkts bytes target prot opt in out source destination What does this means I'm able to connect using SSH. Where can I see that rule?

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  • Accessing large log files on a unix machine with textpad

    - by Jason
    Hi, I'm interested to access large log files on a unix server with textpad. (textpad for history reasons, i personally prefer ofcourse less awk grep etc) but I have many personal who rather be using textpad they have years of experience with it and can tweak it to do whatever they want. The problem is that if i connect for example with winscp to get the log files to textpad it first fetches the full log and user needs to wait and it bloats etc. I would rather the textpad to somehow access the unix machine and get only the relevant segment of the log file (large log files could be GB) anyone knows how can this be achieved?

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  • How to find the reason for a weekly downtime on an Ubuntu web server hosted by AWS?

    - by IceSheep
    We started monitoring our web server using Pingdom and found out that we have a downtime of a few minutes every Sunday at 0:00 UTC. The test runs every minute and checks if a successful HTTP response (code 200) is returned on port 80. The test fails due to a timeout (no response after 30 seconds). Here's what we've already checked – without success: Since we run our webserver behind a load balancer, I've set the Pingdom test on the load balancer's public DNS and the webserver's public DNS in order to find out if there's a problem with the AWS load balancer – both tests return the same result We set up Munin on our webserver. Everything looked fine even after the failure. Since the last failure lasted only 2 minutes I suppose Munin couldn't capture a potential problem (it only checks every 5 minutes) I have checked /var/log/apache2/error.log and /var/log/syslog for suspicious entries I have checked /etc/cron.weekly and /etc/crontab for suspicious entries I have searched for files created or last-modified during 0:00 and 0:15 using this method: touch -t 201209020000 start touch -t 201209020015 end find / -newer start -and ! -newer end (nothing found) Has anybody experienced a similar problem? Any proposals on how to find the reason for this behavior? It's Ubuntu 10.04 LTS running on an AWS m1.large instance. Thanks!

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  • Display issues on new OpenSUSE install

    - by user1319182
    I installed OpenSUSE 13.1 on my newly built PC, but the display is just horrible : the edges of the screen are missing. For example, I can't see all the top part, I can barely read the date and I see "ctivities" instead of "Activities". However, when I take a screenshot everything seems to be fine (the cursor doesn't appear though) the characters are sometimes too big and sometimes too small the cursor is huge and many other strange things. I took a few pictures I'm using an Intel integrated GPU (HD4400) and made all the possible updates with YaST. Any idea how I can fix this? Thanks

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  • Replacing every 10th pipe with new line in unix

    - by user327958
    Lets say I have fields: name, number, id I have a data file: name1|number1|id1|name2|number2|id2...etc I want to replace every 3rd pipe with a new line or '\n' so I get: name1|number1|id1 name2|number2|id2 I'm having no luck with awk or sed. I've tried the following, and variations of: awk '/"\|"/{c++;if(c==10){sub("\|","\n");c=0}}1' inputfile.txt sed 's/"|"/"\n"/2' inputfile.txt It tells me awk: syntax error near line 1 awk: illegal statement near line 1 awk: syntax error near line 1 awk: bailing out near line 1 Any help is greatly appreciated! EDIT: Thank you!

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  • Bridging two wireless interfaces with brctl?

    - by AK_
    I have this topology: [internet] ^ L-------[wlan0]-[host]-[wlan1]-----[client-1] I tried to bridge wlan0 wlan1 but it wont work with brctl; but magically when I issue this command #iw set dev wlan0 4addr on it adds wlan0 to the bridge BUT I lost all internet connection and I was unable to hook it to the internet router. can somebody please explain why did that happen and is there a way to get this done ?

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  • Routing Traffic With OpenVPN

    - by user224277
    Few minutes ago i configured my VPN server, and actually I can connect to my VPN but all trafic is going through my normal home network. On my OpenVPN application I've got an information : Server IP: **.185.***.*10 Client IP: 10.8.0.6 Traffic: 7.3 KB in, 5.6 KB out Connected: 10 June 2014 19:21:59 So everything is connected but how I can setup on windows 7 that all trafic have to go through OpenVPN network card ?? Client setting : client dev tun proto udp # enter the server's hostname # or IP address here, and port number remote **.185.***.*10 1194 resolv-retry infinite nobind persist-key persist-tun # Use the full filepaths to your # certificates and keys ca ca.crt cert user1.crt key user1.key ns-cert-type server comp-lzo verb 6 Server setting : port 1194 proto udp dev tun # the full paths to your server keys and certs ca /etc/openvpn/keys/ca.crt cert /etc/openvpn/keys/server.crt key /etc/openvpn/keys/server.key dh /etc/openvpn/keys/dh2048.pem cipher BF-CBC # Set server mode, and define a virtual pool of IP # addresses for clients to use. Use any subnet # that does not collide with your existing subnets. # In this example, the server can be pinged at 10.8.0.1 server 10.8.0.0 255.255.255.0 # Set up route(s) to subnet(s) behind # OpenVPN server push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" ifconfig-pool-persist /etc/openvpn/ipp.txt keepalive 10 120 status openvpn-status.log verb 6 and sysctl : net.ipv4.ip_forward=1 Thank you for your time and help.

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  • nginx clean url router/rewrites

    - by Janko
    im having difficulties with a relativity simple rewrite rules / router in nginx config. All I want to do is, if requested dir or file 'host/my/request/path[/[index.php]]' does not exist, rewrite to 'host/my/request/path.php' Current rewrite works for: host host/ host/my/request/path But wont work for: host/my/request/path/ Here is the rewrite part of the config: location = /(.*)/ { rewrite ^(.*)$ $1 permanent; } location / { try_files $uri/ $uri $uri.php; } Error log will report: Access forbidden by rule, request: "GET /my/request/path/ HTTP/1.0" Hm, is there a better way to solve this or get rid of the trailing slash? edit, rules more elaborative: host[/] > host/index.php host/index[/] > host/index.php host/my/path[/] > if /path/index.php exists: host/my/path/index.php else host/my/path.php

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