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  • How do I permanently disable Linux's console screen saver, system-wide?

    - by raldi
    I've got an Ubuntu server that boots up in text mode. It rarely has a screen or keyboard attached to it, but when I do attach a screen, I usually have to attach a keyboard too, because the darn console mode screen saver will be on and I'll need to hit a key to see what's going on. I'm aware that the setterm command can disable this, but it's a per-session thing. How can I make it so the machine never ever blanks the screen in text mode, even when it's first booted up and sitting at the login prompt?

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  • Linux Raid: Can mdadm --grow a raid1 while mounted?

    - by Chris
    I have 2 500gb drives in a RAID1 setup that I needed to upgrade for more space. I mdadm --fail'ed each drive in turn and I used dd to copy each drive to it's respective larger drive (2tb each), removed the smaller drives and replaced them with the larger drives, and reassembled the array and forced a resync. So now I've got a 500gb RAID1 sitting on 2TB drives, and wish to grow them. The plan is to use mdadm --manage /dev/md0 --grow to grow them, then boot a rescue cd, assemble the array under that environment, and do the resize2fs on them. Can I use mdadm --grow on a mounted and live filesystem? Also, do I need more options to make sure the grow operation stays raid1?

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  • Linux: find out what process is using all the RAM?

    - by Timur
    Before actually asking, just to be clear: yes, I know about disk cache, and no, it is not my case :) Sorry, for this preamble :) I'm using CentOS 5. Every application in the system is swapping heavily, and the system is very slow. When I do free -m, here is what I got: total used free shared buffers cached Mem: 3952 3929 22 0 1 18 -/+ buffers/cache: 3909 42 Swap: 16383 46 16337 So, I actually have only 42 Mb to use! As far as I understand, -/+ buffers/cache actually doesn't count the disk cache, so I indeed only have 42 Mb, right? I thought, I might be wrong, so I tried to switch off the disk caching and it had no effect - the picture remained the same. So, I decided to find out who is using all my RAM, and I used top for that. But, apparently, it reports that no process is using my RAM. The only process in my top is MySQL, but it is using 0.1% of RAM and 400Mb of swap. Same picture when I try to run other services or applications - all go in swap, top shows that MEM is not used (0.1% maximum for any process). top - 15:09:00 up 2:09, 2 users, load average: 0.02, 0.16, 0.11 Tasks: 112 total, 1 running, 111 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: 4046868k total, 4001368k used, 45500k free, 748k buffers Swap: 16777208k total, 68840k used, 16708368k free, 16632k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ SWAP COMMAND 3214 ntp 15 0 23412 5044 3916 S 0.0 0.1 0:00.00 17m ntpd 2319 root 5 -10 12648 4460 3184 S 0.0 0.1 0:00.00 8188 iscsid 2168 root RT 0 22120 3692 2848 S 0.0 0.1 0:00.00 17m multipathd 5113 mysql 18 0 474m 2356 856 S 0.0 0.1 0:00.11 472m mysqld 4106 root 34 19 251m 1944 1360 S 0.0 0.0 0:00.11 249m yum-updatesd 4109 root 15 0 90152 1904 1772 S 0.0 0.0 0:00.18 86m sshd 5175 root 15 0 90156 1896 1772 S 0.0 0.0 0:00.02 86m sshd Restart doesn't help, and, by they way is very slow, which I wouldn't normally expect on this machine (4 cores, 4Gb RAM, RAID1). So, with that - I'm pretty sure that this is not a disk cache, who is using the RAM, because normally it should have been reduced and let other processes to use RAM, rather then go to swap. So, finally, the question is - if someone has any ideas how to find out what process is actually using the memory so heavily?

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  • How can I easily confirm in Linux that two separate directories have the exact same contents?

    - by Mike B
    CentOS 5.x Mq question seemed similar to this one but I wasn't sure... I have two servers (completely isolated from each other), each with a directory and sub-directories that should have the same exact contents. For example the directory layout could be something like: SERVER A - /opt/foo/foob/1092380298309128301283/123.txt /opt/foo/foob/5094380298309128301283/456.txt /opt/foo/foob/5092380298309128301283/789.txt /opt/foo/foob/1592380298309128301283/abc.txt SERVER B - /opt/foo/foob/1092380298309128301283/123.txt /opt/foo/foob/5094380298309128301283/456.txt /opt/foo/foob/5092380298309128301283/789.txt /opt/foo/foob/1592380298309128301283/abc.txt Ideally I'd like a way to do a recursive check and have something confirm that everything matches. I also want to avoid using any third-party tools. Any ideas?

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  • How to map to Windows Server shares in Linux (Ubuntu) easily?

    - by TheCleaner
    I know how to get connected to a Windows share easy enough, and I've read how to change the fstab file to get it to mount at boot. The real question here is...can I create a few shortcuts on a common user desktop so that regardless of who logs into Ubuntu machine they can open that shortcut and it will open the Windows share? I would also need to allow AD credentials during login, so a link to that will help as well, but I'm sure I can search google for that part.

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  • How do I change the output line length from the "top" linux command running in batch mode

    - by Tom
    The following command is useful to capture the current processes that are taking up the most CPU in a file: top -c -b -n 1 > top.log The -c flag is particularly useful because it gives you the command line arguments of each process rather than just the process name. The problem is that each line of output is truncated to fit on the current terminal window. This is ok if you can have a wide terminal because you have a lot of the output but if your terminal is only 165 characters wide, you only get 165 characters of information per process and it is often not enough characters to show the full process command. This is a particular problem when the command is executed without a terminal, for example if you do it via a cron job. Does anyone know how to stop top truncating data or force top to display a certain number of characters per line? This is not urgent because there is an alternative method of getting the top 10 CPU using processes: ps -eo pcpu,pmem,user,args | sort -r -k1 | head -n 10

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  • Linux periodically "losing" ability to connect to server via SSH?

    - by gct
    I know this isn't exactly a programming question, but it popped up in my use of git for programming projects at least. I've got a web server that I use to host my git repos on, but my ubuntu box seems to "lose" the ability to connect to it via SSH. I'll get a "connection refused" error when I try to ssh or use git. Rebooting my local machine will fix the problem, but only temporarily. I can still connect to the web interface just fine, and the problem manifests with other servers as well. I've been working around it by pulling my changes over to my laptop and pushing from there, but that's sub-optimal as you can imagine. Has anyone seen something like this? I'd be tempted to say it's some kind of IP caching problem, but I can't connect even using the IP address of the server directly... Running Ubuntu 9.04

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  • Linux: how to restore config file using apt-get/aptitude?

    - by o_O Tync
    I've occasionally lost my config file "/etc/mysql/my.cnf", and want to restore it. The file belongs to package mysql-common which is needed for some vital functionality so I can't just purge && install it: the dependencies would be also uninstalled (or if I can ignore them temporarily, they won't be working). Is there a way to restore the config file from a package without un-ar-ing the package file? dpkg-reconfigure mysql-common did not restore it.

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  • How to limit network usage for concrete application in linux that is running in it?

    - by B14D3
    I'm looking for something like nice for cpu, but for network usage that will limit application network consumption to level that will configure. I have problems with xapian-replicate-server that is consuming 80 % of my network. It's causing mysql connections problem (mysql server is working on this machine too). I can't move xapian or mysql to other machine so i need to limit xapian network usage to a decent level. Is there any tool that will help me do this ?

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  • How do I find out when and by whom a particular user was deleted in linux?

    - by executor21
    I've recently ran into a very odd occurrence on one system I'm using. For no apparent reason, my user account was deleted, although the home directory is still there. I have root access, so I can restore the account, but first, I want to know how this happened, and exactly when. Inspecting the root's .bash_history file and the "last" command gave nothing, and I'm (well, was) the only sudoer on the system. How would I know when this deletion happened? The distro is CentOS release 5.4 (Final), if that helps.

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  • How do I log file system read/writes by filename in Linux?

    - by Casey
    I'm looking for a simple method that will log file system operations. It should display the name of the file being accessed or modified. I'm familiar with powertop, and it appears this works to an extent, in so much that it show the user files that were written to. Is there any other utilities that support this feature. Some of my findings: powertop: best for write access logging, but more focused on CPU activity iotop: shows real time disk access by process, but not file name lsof: shows the open files per process, but not real time file access iostat: shows the real time I/O performance of disk/arrays but does not indicate file or process

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  • How do I permanently disable Linux's console screen saver, system-wide?

    - by raldi
    I've got an Ubuntu server that boots up in text mode. It rarely has a screen or keyboard attached to it, but when I do attach a screen, I usually have to attach a keyboard too, because the darn console mode screen saver will be on and I'll need to hit a key to see what's going on. I'm aware that the setterm command can disable this, but it's a per-session thing. How can I make it so the machine never ever blanks the screen in text mode, even when it's first booted up and sitting at the login prompt?

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  • How do I get my 192.168.* Linux server accessible via http://hostname/?

    - by rfrankel
    (Sorry if this question isn't worded well and/or is duplicate. I'm not a networking guy and I'm probably not using the right terms...this also makes it hard to see if this has already been answered.) I'm running a CentOS server in VirtualBox, Windows host, and I can see access Apache-hosted pages at http://192.168.1.109/ from machines on my LAN. But what I'd like is for people to be able to type http://hostname/ ...both because it's easier and primarily because I'm not sure that local IP is static. I'm not really sure how to proceed - could someone point me in the right direction? Thanks.

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  • Linux: How do I use Munin in cPanel to monitor MySQL?

    - by Continuation
    I have a cPanel server running CentOS 5.5. I want to use Munin to monitor MySQL. I went to: Main >> cPanel >> Manage Plugins and selected "Install and keep updated" for Munin and clicked "Save". I got the usual bunch of status updates about the install. At the end I got: Going to read '/home/.cpan/sources/modules/02packages.details.txt.gz' Database was generated on Wed, 02 Mar 2011 18:28:33 GMT ..........................................................................DONE Going to read '/home/.cpan/sources/modules/03modlist.data.gz' Out of memory! Callback called exit. Done Done Done Process Complete As you can see I got an "Out of memory!" message. But after that it said "Process Complete". Was Munin installed? When I went back to "Manage Plugins" it Munin has a check that against "Install and keep updated". So is everything alright? And how do I use Munin now? How do i configure it to monitor MySQL? Where can I see the results? Thanks.

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  • How to find out which process is hogging the linux server?

    - by user1149518
    We have a RHEL server. Today it suddenly became slow. Symptoms - It was responding slow to ping queries from other server. When I try to login using ssh, it was taking about 10 seconds to login. I was able to resolve the problem by doing some guess work. I killed one process which I thought was culprit. Which resolved the problem. Though I would like to know what's proper approach to detect the culprit in such kind of "slow server" situations. Le me know proper way to resolving such slowness issues and decting the process causing the slowness. These were the conditions when the server was slow - # vmstat 3 3 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 1 176 6730868 285052 4899676 0 0 3 4 0 0 1 1 97 1 0 0 0 176 6751576 285064 4899704 0 0 0 115 15307 37171 1 1 96 3 0 0 0 176 6751948 285068 4899700 0 0 0 23 14813 39559 1 1 98 1 0 # top top - 16:38:18 up 150 days, 19:36, 64 users, load average: 1.68, 1.46, 1.44 Tasks: 1287 total, 2 running, 1284 sleeping, 1 stopped, 0 zombie Cpu(s): 1.3%us, 1.7%sy, 0.1%ni, 95.9%id, 0.7%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 16620824k total, 9867124k used, 6753700k free, 287424k buffers Swap: 8193140k total, 176k used, 8192964k free, 4898996k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 26258 khk 34 19 130m 47m 7088 S 11.2 0.3 385:32.42 edm Though I would like to know what's proper approach to detect the culprit in such kind of "slow server" situations. Le me know proper way to resolving such slowness issues and decting the process causing the slowness.

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  • How to know the level of a symlink in linux?

    - by ???
    For example, if a symlink a -> b b -> c c -> d say, the symlink level of a is 3. Then, is there any utility to get this info? And, also I want to get the expansion detail of a symlink, which will show me something like: 1. /abc/xyz is expanded to /abc/xy/z (lrwx--x--x root root) 2. /abc/xy/z is expanded to /abc/xy-1.3.2/z (lrwx--x--x root root) 3. /abc/xy-1.3.2/z is expanded to /abc/xy-1.3.2/z-4.6 (lrwx--x--x root root) 4. /abc/xy-1.3.2/z-4.6 is expanded to /storage/121/43/z_4_6 (lrwx--x--x root root) 5. /storage/121/43/z_4_6 is expanded to /media/kitty_3135/43/z_4_6 (lrwx--x--x root root) So I can diagnostic with the symlinks. Any idea?

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  • In Linux, is it possible to get a listing of drives' disk space usage that also shows volume labels?

    - by DavidH
    I know about df, of course, but df does not output volume labels. I have 5 USB hard drives plugged into my NAS box, and would love to know which is which. Current df output: Filesystem Size Used Avail Use% Mounted on /dev/sda1 27G 2.2G 24G 9% / none 56M 476K 55M 1% /dev none 60M 0 60M 0% /dev/shm none 60M 332K 59M 1% /var/run none 60M 0 60M 0% /var/lock none 60M 0 60M 0% /lib/init/rw /dev/sde1 150G 102G 48G 68% /media/usb0 /dev/sdb1 299G 196G 103G 66% /media/usb1 /dev/sdc1 233G 183G 51G 79% /media/usb2 /dev/sdd1 233G 209G 25G 90% /media/usb3 /dev/sdf1 150G 101G 49G 68% /media/usb4

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  • How does one enable --write-mostly with Linux RAID?

    - by user76871
    Unfortunately the mdadm and mdadm.conf man pages are not quite up to par. I would like to enable the --write-mostly flag for my RAID, but neither the man pages nor the internet will tell me how. I am not aware of any place to put default arguments for mdadm, nor aware of when it would be launched and by what. It seems the logical place to add this information is mdadm.conf, but the flag is unmentioned in man mdadm.conf. Where and how can I enable --write-mostly? Thank you.

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  • Linux virtual disk stripping or multi-path samba share?

    - by wachpwnski
    I am trying to build a file storage box for media. It needs to span two or more directories or partitions as one share. There are a few solutions but reasons why I want to avoid them, among these are: Using LVM2 for stripping. I don't really have the resources to back up everything on the volumes incase one HDD goes south. I would end up loosing everything. Maybe there is a better option for this to prevent data loss with hot swappable drives or some kind of raid. Using symbolic links in the share. This will get tedious every time a new sub-directory is added. Is there some kind of software raid I can use to merge two directories virtually? I am aware of the issue where /dev/hda1/media/file.1 and /dev/hdb1/media/file.1 both exist. But I'm sure there are some creative solutions for this.

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  • How to get linux to stop asking "There are # rows, list them anyway? [n/y]" for auto-completing

    - by Michael
    How do I get tcsh to stop asking if I want to list files in a directory that may have a lot of auto-completes? For example, if I do: xemacs ../"TAB" to get the list of files it asks: There are 371 rows, list them anyway? [n/y] I don't want it to ask this, just list them.. it's getting tiresome. (Or how to at least set the tolerance to a higher number of auto-completes before it asks) Thanks.

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