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  • How to keep subtree removal (`rm -rf`) from starving other processes for Disk I/O?

    - by David Eyk
    We have a very large (multi-GB) Nginx cache directory for a busy site, which we occasionally need to clear all at once. I've solved this in the past by moving the cache folder to a new path, making a new cache folder at the old path, and then rm -rfing the old cache folder. Lately, however, when I need to clear the cache on a busy morning, the I/O from rm -rf is starving my server processes of disk access, as both Nginx and the server it fronts for are read-intensive. I can watch the load average climb while the CPUs sit idle and rm -rf takes 98-99% of Disk IO in iotop. I've tried ionice -c 3 when invoking rm, but it seems to have no appreciable effect on the observed behavior. Is there any way to tame rm -rf to share the disk more? Do I need to use a different technique that will take its cues from ionice? Update: The filesystem in question is an AWS EC2 instance store (the primary disk is EBS). The /etc/fstab entry looks like this: /dev/xvdb /mnt auto defaults,nobootwait,comment=cloudconfig 0 2

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  • How to diagnose RAM?

    - by x-man
    I have a java process that is aborted after a while with SIGSEGV. It started to happen after I upgraded the server with more RAM. Having tested on different JVMs I suspect it might be a hardware problem. But no problem was detected by memtest86. So, what else can I do to detect the source of the problem is? Should I take the RAM modules one by one to detect the faulty module? The server is running on 64bit OpenSuse11.3. The memory is not an ECC one it seems. I have a kit of this (3*4GB * 2 = 24GB): http://www.kingston.com/datasheets/KHX1600C9S3K2_8GX.pdf

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  • Does anyone know why rsync would keep sending the files over and over again?

    - by beagleguy
    I'm trying to using rsync to backup some files, about half a TB. It's now it a state where it keeps sending the same files everytime it runs. for example: rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt I then verify those files are copied over... then the next time it runs it does the same thing rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt any idea why it's getting stuck on these files? I've tried to wipe the whole dest directory out and start over but no luck. thanks,

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  • After installing Ubuntu how do I get rid of unity and go back to gnome?

    - by aseq
    After I have installed the newest Ubuntu LTS release (12.04, still in beta though) I am greeted with an unfamiliar and difficult to use desktop environment. I believe it is called unity. However I have used gnome for a decade and a half and I would not like to move to this new and (for me) unusable desktop environment. What is a quick and easy way to remove (most) of unity and bring back gnome, as well as configure my display manager to load gnome by default with the environment as close as possible to the way it was before?

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  • symlink and sudo executable

    - by CodeMedic
    If I have the below sudoers entry usera ALL=(userb) NOPASSWD: /home/userc/bin/executable-file usera ALL=(userb) NOPASSWD: /home/userc/bin/link-to-another-executable-file When I log-on as usera and try running the below commands, it works sudo -u userb /home/userc/bin/executable-file but NOT the one below. sudo -u userb /home/userc/bin/link-to-another-executable-file Sorry, user usera is not allowed to execute '/home/userc/bin/link-to-another-executable-file' as userb on hostname. Any ideas?

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  • I don't see the running guest in virsh

    - by Louise Hoffman
    Using CentOS 5 with KVM. I have downloaded this KVM applicance, and when unzipped it is just a .img file. No xml file supplied. I can start the guest with /usr/libexec/qemu-kvm -hda /data/kvm/slash.img -m 512 and it works. Now I would like to make a config file for the guest. The problem is when I do # virsh -c qemu:///system list Id Name State ---------------------------------- # I don't see the guest as expected. Does anyone know what is wrong?

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  • How to set up virtual users in vsftpd?

    - by ares94
    I've read this tutorial: http://howto.gumph.org/content/setup-virtual-users-and-directories-in-vsftpd/ My configuration is as follow: ---vsftpd.conf--- listen=YES anonymous_enable=NO local_enable=YES virtual_use_local_privs=YES write_enable=YES connect_from_port_20=YES pam_service_name=vsftpd guest_enable=YES user_sub_token=$USER local_root=/var/www/sites/$USER chroot_local_user=YES hide_ids=YES ---/etc/pam.d/vsftpd--- auth required pam_pwdfile.so pwdfile /etc/vsftpd/passwd account required pam_permit.so I created file /etc/vsftpd/passwd and added users using htaccess. I tried to login but it didn't work: ftp 127.0.0.1 Connected to 127.0.0.1 (127.0.0.1). 220 vsFTPd 2.3.5+ (ext.1) ready... Name (127.0.0.1:root): user1 331 Please specify the password. Password: 530 Permission denied. Login failed. Everything seems fine accept the permission denied thing. How can I fix this?

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  • Chef cookbooks marked as executed

    - by Gonzalo Alvarez
    I have setup a Chef server in our network that I use to manage several nodes. These nodes have a chef-client installed executing as a daemon every X minutes. The problem is that every time the client runs, it executes the recipes for all the cookbooks, even those previously executed, so it consumes resources and sometimes it even breaks thinks (with services restarts, for example). I know that I can avoid executing a piece of code or a recipe I create as detailed here: Prevent chef recipe from executing previously executed action? but, would this mean that I should modify any cookbook that I download from the opscode repository. In other words, is it possible to make the chef server (or the clients) to mark the cookbooks as 'executed' as soon as they are executed the first time?

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  • Cannot chown my own files from NFS

    - by valpa
    We have a NFS server provide home directory for many account, which provided by a NIS server. I have account A and B. In /home/A, I try to copy "cp -a /home/B/somedir ~/". Then I found in /home/A/somedir, all files are owned by user A. Then if I do "chown -R B:B somedir", I got "Operation not permitted" error. I am user A, "cp -a" didn't preserve the original user (B). Then I cannot chown my own files. Any suggestion? I fix my own issue by "chmod 777 /home/A", "su - B" and "cp -a somedir /home/A/", and "su - A", then "chmod 755 /home/A". But it is not a good solution.

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  • LPR command won't recognize CUPS printer

    - by Datapimp23
    I have a cups server with one shared printer configured on it. It prints test pages without problems. printername (Idle, Accepting Jobs, Shared) Description: desc Location: Driver: Zebra ZPL Label Printer (grayscale, 2-sided printing) Connection: socket://172.20.50.26 Defaults: job-sheets=none, none media=oe_w288h432_4x6in sides=one-sided This is the output from lpstat -t. it shows that the printer is idle and accepting requests admin@SERVER:~$ lpstat -t scheduler is running no system default destination device for printername: socket://172.20.50.26 printername accepting requests since Thu 26 Jan 2012 01:29:35 PM CET printer printername is idle. enabled since Thu 26 Jan 2012 01:29:35 PM CET Now when I want to send a printjob to it via an LPR command it won't recognize the printer /usr/bin/lpr -P printername test.pdf Result lpr: ttn_seg_zebra1: unknown printer What am I missing here ?

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  • Add Clamd as a service to CentOS?

    - by Josh
    As I understand I think I need to add something to init.d, but I am not sure what to add. At the moment to start clamav I have to do clamd start. I would like it as a service so I can start it on run level 3 as a service. I realize I could probably do this through a shell script in the right runlevel, but I would like to be able to use chkconfig to configure it.

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  • How do I Forward root's email to an external email address?

    - by ErebusBat
    I have a small server (Ubuntu 10.04) at my house and I would like to forward root's email to my gmail hosted domain to get security notifications and what not. I ripped everything out and started from scratch and ran into some other issues. I now have sendmail working in the sense that I can mail [email protected] and get the mail. HOWEVER, adding an address to /root/.forward does not actually forward the message. I get the following in my logs: Dec 22 14:04:37 batcave sendmail[4695]: oBML4bAT004695: to=<root@batcave>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30075, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBML4bJ9004696 Message accepted for delivery) Dec 22 14:04:39 batcave sm-mta[4698]: STARTTLS=client, relay=[69.145.248.18], version=TLSv1/SSLv3, verify=FAIL, cipher=DES-CBC3-SHA, bits=168/168 Dec 22 14:04:40 batcave sm-mta[4698]: oBML4bJ9004696: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:00:03, xdelay=00:00:03, mailer=relay, pri=120336, relay=[69.145.248.18] [69.145.248.18], dsn=2.0.0, stat=Sent (OK 01/D4-00853-216621D4) You can see where my local sendmail instance accepts it then hands it off to my ISP, but with the wrong address ([email protected]).

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  • Ubuntu server loses network connection after ADSL2+ modem reset

    - by squashbuff
    I am using an ubuntu 10.04 server (running on a Lenovo Thinkpad notebook) as my webserver. It is performing well in terms of handling the traffic etc. However my internet connection is ADSL2+ (using Thomson TG782T modem-router) and if the modem is reset, then my server loses network connection. The networkmanager icon shows a red exclamation mark showing that is has no connection. But as soon as I click on it and tell it to connect to eth0, the connection is back on. It must be something that networkmanager is failing to do and because of this, the reliability of my webserver is suffering. Any advice on how this can be fixed?

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  • pptp VPN, routing

    - by Adrian
    Details: eth0 = current internet port pptp1 = VPN connection, if I connect to my provider, he give me an IP address, which is accessible from the internet. This is what I need. I want to connect through this IP back to my PC. I want to keep my primary internet connection (eth0) on my PC for all traffic, but route traffic to VPN for specified application/or port, to access application/port from the IP, which I given from the pptp provider. Huhh? Difficult but, it is possible? If yes, how? Incoming port will be always: 33340 Outgoing port can be change, but usually it is 33330

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  • CHROOT for shell script testing

    - by Josh
    I am looking at setting up a shell script in order to properly document and automate the process I am using to setup a few servers we have. In order to test the shell script through its different stages I was thinking a CHROOT would be ideal, since I can wipe out the "virtual root" and create it on the fly. I have never used CHROOT before, however. I was just curious what are the exact steps I would need to follow to implement this process of creating a chroot (with the basic core functions that would be needed to install apache/php/etc.)? and then destroying it?

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  • CentOS 6 - iptables preventing web access via port 80

    - by bsod99
    I'm setting up a new web server with CentOS 6.2 and am not able to connect via the web. Everything looks set up correctly in httpd.conf and Apache is running, so I'm assuming it's an iptables issue. Is there anything in the following which could be causing the issue? # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited ACCEPT tcp -- anywhere anywhere tcp dpt:http Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT)

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  • SSH agent forwarding on debian squeeze

    - by nfvindaloo
    Im trying to set up SSH forwarding like this osx debianA debianB I can connect to debianA fine, using ssh -A and it has the following env vars when i do: SSH_AGENT_PID=1543 SSH_AUTH_SOCK=/tmp/ssh-giwdYY1542/agent.1542 SSH_CLIENT='92.233.199.x 38954 22' SSH_CONNECTION='92.233.199.x 38954 108.171.179.x 22' SSH_TTY=/dev/pts/0 When i try to connect to debianB, the agent is not used! ssh -v output ends with: debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/nic/.ssh/id_rsa debug1: Trying private key: /home/nic/.ssh/id_dsa debug1: Next authentication method: password Then im asked for a password. I have not set any ForwardAgent no directives in ssh_config and dont have a .ssh/config at all. sshd_config has not got AllowAgentForwarding in it. I have tried all of these directives as yes also. debianA and debianB both have identical ssh_config and sshd_config (verified with diff) so the really weird thing is connecting OSX debianB debianA works fine!! Im totally out of ideas! Has anyone come across this before? Cheers! NFV

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  • a brand new FS based on a database without using fuse

    - by Devrim
    hi all, To serve millions of files out of a single directory, being able to connect to a drive from hundreds of endpoints, and for some other reasons (to avoid gluster/nfs/all fs based networking solutions), I want to evaluate the possibility of making a filesystem that's based on a mongodb (or any other). Basically, it works like fusefs, every single file is kept in mongo gridfs. In theory, I do, mount mongodbfs /mountPoint mongodb://localhost then when i say touch /mountPoint/test.txt this file is inserted into mongodb. This FS will also store uid/gid and perms with the file, we can throw hundreds of servers to it, and no useradd will be necessary. I'm not thinking to include all the features of FS, just the ones we need. My question is, how do I start my quest in finding resources, books, links, people, developers who'd help me implement this? at least a proof of concept. Is it feasible? What should I expect as a timeline for such undertaking? Please only think about gazillion small files and folders.

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  • Problem with running a script at startup as root?

    - by Usman Ajmal
    Hi The main question: Is there a way I can run 'completely' one of my script when ubuntu's desktop appears no matter if root , administrator, desktop user or an unprivileged user logged in? What does the script do? The script mounts a partition, looks for a file in that partition and finally on the basis of that file a decision of copying a partition to another partition is made. That copying is done via dd if=/dev/sda2 of=/dev/sda5 When does the script run finely? Script runs smoothly when I run it from the terminal by sudo ./my_copying_script This command asks me for the password of currently logged in user. I enter the password and the script starts working. When does the script NOT run finely? I want to run the script at startup. I set it a startup program by using the Startup Applications utility of Ubuntu. Script ran at startup but exited at the dd command returing following error: dd: opening '/dev/sda2': Permission denied On edk's suggestion I set the owner of my_copying_script as root and set the SUID. Now the permissions of my_copying_script are (-rwsr-sr-x). edk's point of view was that once I set the suid, the startup program will run with the permissions of its owner. I did that but the same /dev/sda2 permission denied error came up. I then prefixed the dd with sudo as mentioned below sudo dd if=/dev/sda2 of=/dev/sda5 but this returned following error: sudo: no tty present and no askpass program specified In other words the mounting failed. If I run the script using sudo ./myProgram i don't face this problem and the drive gets mounted successfully.

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  • Remote access to phpmyadmin from computer belongs to same LAN

    - by Charles
    OK... I solved it. It is because I have not configured the httpd.conf to allow the centos listen port 80 and 8080. Listen 80 Listen 8080 I have setup the myphpadmin on my CentOS 6.4 recently. I can access and login to the myphpadmin on my localhost. However, when I type http://[hostipaddr]/phpmyadmin on my other computer in the same LAN with the CentOS, the browser simply cannot access the page. Below are some of the current configuration. Anyone can help please......? config.inc.php $i++; /* Authentication type */ $cfg['Servers'][$i]['auth_type'] = 'http'; /* Server parameters */ $cfg['Servers'][$i]['host'] = 'localhost'; $cfg['Servers'][$i]['connect_type'] = 'tcp'; $cfg['Servers'][$i]['compress'] = false; /* Select mysql if your server does not have mysqli */ $cfg['Servers'][$i]['extension'] = 'mysql'; $cfg['Servers'][$i]['AllowNoPassword'] = false; phpmyadmin.conf <Directory /var/www/html/phpmyadmin/> order allow,deny allow from all </Directory> Furthermore, I can access the webpage that stored in the CentOS from my other computer without problems. After using wireshark and tcpdump, I found that the server (the Cent OS) keep resetting the connection. (192.168.1.106 is my other computer, 192.168.1.101 is my CentOS) 23:29:42.281473 IP 192.168.1.106.55999 > 192.168.1.101.webcache: Flags [S], seq 2559409090, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0 23:29:42.281504 IP 192.168.1.101.webcache > 192.168.1.106.55999: Flags [R.], seq 0, ack 2559409091, win 0, length 0 I have disabled the iptables service on the CentOS already.

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  • Allowing access to MPD from local network

    - by August Karlstrom
    I have successfully installed MPD (Music Player Daemon) on my desktop computer. Everything works fine when the client runs on the same machine as the server. Now I would like to access MPD from my laptop computer which is connected (wirelessly) to the local network. In order to allow access to MPD from any computer on the local network I have added this line to /etc/hosts.allow: mpd: .local and restarted MPD. Still I get the message "error: Connection refused" when I try to access MPD with MPC (Music Player Client) from my laptop. Any clues or troubleshooting hints?

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