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• Is there anyway that I can set the 'real' memory usage value while running my java code?

  - by vira

  I'm running a code on a server to generate a 10,000x10,000 matrix and save each value into a table (MySQL). I was informed by the administrator that I can use up to 32g of the physical memory of our server but have no idea how to do it. I googling around and so far only found information about setting the virtual memory using -Xmx. I tried it anyway and using top command I got this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3981 gv 35 15 32.4g 304m 10m S 1 0.5 9:54.84 java So, it shows that the -Xmx set the VIRT and not the RES value. Is there anyway that I can set the RES value into 32g?

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• ruby on rails server is intermittently slow

  - by Richard

  My rails installation was chugging along nicely. Last night we had to perform a hot-patch with was really a standard deploy of some exception code. Once capistrano finished the operation one of our admins discovered that there were two long running passenger processes. While we have deployed release over the past two weeks it would appear that these processes have been here and alive the whole time. Granted they could have been zombies or any other artifact and at this point we do not know what state they were in. Which leads me to the question: There are so many moving parts between the rails application and the OS/hardware that being a SME is probably no longer possible. So; how does a sysadmin perform root-cause analysis with any certainty? And: When do I just start rebooting servers?

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• Apache downloads php files instead of running their source

  - by Devils Child

  I have just recently upgraded PHP 5.3 to 5.4 on my Debian Squeeze server. Now, instead of executing PHP files, Apache just downloads them, which is really bad. When I try to follow these steps, I get "broken packages" upon installing the libapache2-mod-php5 package. Also the answer tells me to add something to my httpd.conf, but it's empty. Question: How can I make apache execute php files again, instead of just passing them through as download? dpkg -l | grep php returns this rc libapache2-mod-php5 5.3.3-7+squeeze15 server-side, HTML-embedded scripting language (Apache 2 module) rc php5-cli 5.3.3-7+squeeze15 command-line interpreter for the php5 scripting language ii php5-common 5.4.15-1~dotdeb.2 Common files for packages built from the php5 source rc php5-gd 5.3.3-7+squeeze15 GD module for php5 rc php5-mcrypt 5.3.3-7+squeeze15 MCrypt module for php5 rc php5-mysql 5.3.3-7+squeeze15 MySQL module for php5 rc php5-suhosin 0.9.32.1-1 advanced protection module for php5 rc phpmyadmin 4:3.3.7-7 MySQL web administration tool And apt-get install libapache2-mod-php5 produces this error The following packages have unmet dependencies: libapache2-mod-php5 : Depends: libdb5.1 but it is not installable Depends: libssl1.0.0 (>= 1.0.0) but it is not installable Depends: libxml2 (>= 2.8.0) but 2.7.8.dfsg-2+squeeze7 is to be installed Recommends: php5-cli but it is not going to be installed E: Broken packages

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• How can I use '{}' to redirect the output of a command run through find's -exec option?

  - by pkaeding

  I am trying to automate an svnadmin dump command for a backup script, and I want to do something like this: find /var/svn/* \( ! -name dir -prune \) -type d -exec svnadmin dump {} > {}.svn \; This seems to work, in that it looks through each svn repository in /var/svn, and runs svnadmin dump on it. However, the second {} in the exec command doesn't get substituted for the name of the directory being processed. It basically just results a single file named {}.svn. I suspect that this is because the shell interprets > to end the find command, and it tries redirecting stdout from that command to the file named {}.svn. Any ideas?

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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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• puppet execution of a python script where os.system(...) command is not working

  - by philippe

  I am trying to manage Unix users with puppet. Puppet provides enough tools to create accounts and provide authorized_keys files for instance, but no to set up user password, and it tell to the user. What I have done is a python script which generate a random password and send it to the user by email. The problem is, it is not possible to launch passwd Unix command with python, I have then written a bash script with the command: echo -ne "$password\n$password\n" | passwd $user passwd -e $user Launched manually, the script works fine and the created user has its password sent by email. But when puppet launches it, only the python script gets executed, as if the os.system('/bin/bash my_bash_script') is ignored. No error is displayed. And the user gets its password, but the passwd commands are not launched. Is there any limitation with puppet preventing to perform what I described? Or, how can I otherwise change the user account, its expiration, and send password by email? I can provide more information, but right now, I don't know which are accurate. Many thanks!

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• I've two swap partitions, how can i delete one?

  - by Gp2mv3

  I've installed Ubuntu on my computer but I did a mistake during the installation and it created two swap's. In fact I had tree partitions (system, home, swap) but the installator crashed so I restarted the installation and it has installed everything in the system partition. So now I separated the home in the appropriate partition but I've two swap partitions. How can I delete one ? If I delete one, how will it go ?

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• ssh login - execute command - exit

  - by renton

  hi folks, is there a way to just execute a command (or script) on a user (ssh) login and then exit? some kind of replacing the default shell with a custom script. i want a user only be able to restart a service, but not to have regular shell-access thanks

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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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• Help with user login on Centos 5.6

  - by Owen

  I added a user for the sole purpose of using SU for root. I did not allow the creation of a home directory when creating the user. So now when I login as this user I get the following: Could not chdir to home directory /home/MYUSERNAME: No such file or directory Couldn't resolve homedir for current user at - line 0 BEGIN failed--compilation aborted. Couldn't resolve homedir for current user at - line 0 BEGIN failed--compilation aborted. Is this an error, and if so how do I fix it so it is not looking to "resolve" the homedir?

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• Touchscreen on KDE and Ubuntu?

  - by The Quantum Physicist

  I just bought a Lenovo Yoga 2 Pro... I liked the activity of the touchscreen on Windows, and it makes sense as it does on my smart phone. However, I'm not a regular windows user, so I installed Kubuntu 14.04, and everything looks fine, except that the activity of the touchscreen is so silly that it's useless. Why? Because all the touchscreen does is a single mouse with left click. For example, if I touch the screen for a relatively long time, I don't get the effect of a right click. How do I configure the touchscreen properly to get the activity expected on Ubuntu and KDE? Thanks for any efforts.

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• Performance Drop Lingers after Load [closed]

  - by Charles

  Possible Duplicate: How do you do Load Testing and Capacity Planning for Databases I'm noticing a drop in performance after subsequent load tests. Although our cpu and ram numbers look fine, performance seems to degrade over time as sustained load is applied to the system. If we allow more time between the load tests, the performance gets back to about 1,000 ms, but if you apply load every 3 minutes or so, it starts to degrade to a point where it takes 12,000 ms. None of the application servers are showing lingering apache processes and the number of database connections cools down to about 3 (from a sustained 20). Is there anything else I should be looking out for here?

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• Connection closed by remote host followed by Connection refused

  - by Khosrow

  All of a sudden my ssh connection to server has been damaged. Here is what's happened: $ ssh -vvv -p <PORT> -l <USER> <HOST> OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/khosrow/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to <HOST> [<IP>] port <PORT>. debug1: Connection established. debug1: identity file /home/khosrow/.ssh/identity type -1 debug1: identity file /home/khosrow/.ssh/id_rsa type -1 debug1: identity file /home/khosrow/.ssh/id_dsa type -1 ssh_exchange_identification: Connection closed by remote host I've recently updated the box with yum update and sshd got updated as well. I honestly don't know if this caused any damages or not. But it's prompted that /etc/ssh/sshd_config was stored as /etc/ssh/sshd_config.rpmnew which was quite normal. I've seen similar posts while googling, but almost all of them suggests that I should check /etc/hosts.allow and /etc/hosts.deny, which in my case, I can't. I can not connect to the box to see what's going on there. I rebooted the box, through web interface of server provider, and it even got worse. I'm now getting this: $ ssh -vvv -p <PORT> -l <USER> <HOST> OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/khosrow/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to <HOST> [<IP>] <PORT>. debug1: connect to address <IP> port <PORT>: Connection refused ssh: connect to host <HOST> port <PORT>: Connection refused with both <CUSTOM_PORT> and default 22 ports. I would really appreciate if anyone could help me on this.

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• Applications getting killed automatically

  - by nebi

  I am running httperf client on my m/c and after few seconds it is getting killed. dmesg shows: The command is: httperf --hog --client=0/1 --server=39.0.0.2 --port=80 --uri=/50kb --rate=20000 --send-buffer=4096 --recv-buffer=16384 --num-conns=6000000 --num-calls=1 Although I had done this test no. of times but never faced this error any time. From last two days I am observing this. My Ubuntu version is ubuntu 10.04. and httperf version is httperf-0.9.0 [ 2997.180620] Out of memory: kill process 7977 (apache2) score 70532 or a child [ 2997.180632] Killed process 7977 (apache2) [ 2997.184837] Out of memory: kill process 7971 (rsyslogd) score 8702 or a child [ 2997.184844] Killed process 7971 (rsyslogd) [ 2997.188823] Out of memory: kill process 7978 (apache2) score 1354 or a child [ 2997.188829] Killed process 7978 (apache2) [ 2997.192817] Out of memory: kill process 7973 (atd) score 561 or a child [ 2997.192822] Killed process 7973 (atd) [ 2997.196805] Out of memory: kill process 8102 (httperf) score 471 or a child [ 2997.196811] Killed process 8102 (httperf) Output of free command: total used free shared buffers cached Mem: 3862768 163000 3699768 0 2384 13068 -/+ buffers/cache: 147548 3715220 Swap: 3905528 0 3905528

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• Lighttpd based server issues crop up when port forwarding

  - by michael

  I have four host computers running lighttpd webservers. they are sitting behind a hspa modem, which each occupying a http port between [81 - 84]. 80 is taken by the modem itself. The port forwarding is setup correctly, however, only a portion of any webpage I request from any of the hosts comes through (they all fails after %20 of the page). If I put the host on port 81 into the dmz, it serves pages fine. The others do not respond to the dmz treatment. Is it possible the web content on the hosts somehow require ports aside from their respective http port? Or is it possible that even though the server.port in the lighttpd_ssl.conf file is set, the individual hosts are still expecting to serve on port 80? I am not familiar with lighttpd, nor did i set them up. they are running on video encoders i purchased. I can grab any files from them required for further information on the problem.

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• Change directory upwards to specified goal

  - by haakon

  I'm often deep inside a directory tree, moving upwards and downwards to perform various tasks. Is there anything more efficient than going 'cd ../../../..'? I was thinking something along the lines of this: If I'm in /foo/bar/baz/qux/quux/corge/grault and want to go to /foo/bar/baz, I want to do something like 'cdto baz'. I can write some bash script for this, but I'd first like to know if it already exists in some form.

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• Cross-platform centralized desktop password manager

  - by Dave

  I have been using KeePass as a desktop password manager on Windows for many years. Love it! However, I am now needing to work on different platforms much of my day (Windows 7, Windows XP, Mac OS X, Ubuntu, and OpenSUSE.) I'm looking for a password manager I can share across all these platforms. My ideal solution would: Run natively (not in a virtual machine) on all platforms. Store the "official" copy of the password data on a local network so I can get to it from any and all machines. It is OK if it locks (or becomes read-only) when one client is accessing it. Keep a local cached copy (read-only is fine) so I can still get to my passwords when disconnected from the network. Does any such beast exist?

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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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• Started an application through SSH, command line now gone, what happens next?

  - by Chris Dutrow

  Context: This is a very basic question Using Putty and SSH for the first time to do some serious server setup and run into the situation where I have started a process that I do not want to stop. The process is the gunicorn WSGI HTTP Server (running on Centos 6.3). The command I used to start the process is (as per their Quick Start): gunicorn -w 4 myapp:app At this point in the work session, I have lost the command prompt. This must be such a non-issue that it doesn't even enter into an experienced user's consciousness. But unfortunately at my level of experience, I am left with several fundamental questions: Does the fact that I have lost the command prompt mean that the process is still running? How do I get back to the command prompt without killing the process? How do I come back and monitor the process later? How do I eventually kill the process? Any help is appreciated, thanks so much!

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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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• Transparent, unicode X terminal not tied to a Desktop Environment?

  - by jamuraa

  I've been looking for this for a while now and I just haven't been able to find one. The last few that I used were: aterm - this one was fast and had good transparency support, but it doesn't support Unicode at all as far as I can tell. The dependency graph is also reasonable. gnome-terminal - was good, and had good transparency support plus unicode, but it pulls in about everything in gnome, and I don't use anything else in gnome. It was also somewhat slow (noticable lag in updating at times) and wouldn't use fonts that I wanted. Eterm - same thing as aterm, good dependencies and transparency but no unicode. Does anyone have suggestions, or will I be stuck with gnome-terminal's dependencies and slowness?

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• Change ip route metric

  - by notphunny

  I'm constantly switching between eth0 and wlan0 interface on my archlinux because I often change OpenWrt fw images on my second router (which isn't connected anywhere). So I have problem with my routes when I'm connected to my wlan and want to connect with Ethernet to my router. Both routers are on 192.168.1.1/24 and after connecting to my Ethernet profile eth0 route becomes default one (which is ok for the time), because of smaller metric I guess. So I'm interested, how can I change routes metric so my applications can be connected to the internet (through out wlan)? Maybe there is solution not to use Default Gateway on Ethernet profile, however I still want to know how to change metric. Or default route if there are more then one.

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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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• 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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• 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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