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  • Very High Network out in ec2 instance

    - by Jatin
    I launched an ubuntu-14.04-64bit instance in Amazon EC2 two days back. And I started Tomcat 7.0.54 in that instance and deployed my application war files. It has no other software installed other than tomcat and the default ones. In the past 2 days, its shows 858 GB of Data Transfer(Network Out) from that instance. I have attached a graph of Amazon CloudWatch Metric "Network Out" My application does not do any data download/upload. Its a Java Spring application and the front end is in HTML&Javascript. My application traffic was very low (less than 20 hits) in those 2 days. Is there a way to find out why these data transfers happened and also to find what data has been transferred. If you can see in graph, network out was 20gb per minute. Some more info: Network in was negligible CPU Utilization was very high Everything else was low

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  • How to analyse logs after the site was hacked

    - by Vasiliy Toporov
    One of our web-projects was hacked. Malefactor changed some template files in project and 1 core file of the web-framework (it's one of the famous php-frameworks). We found all corrupted files by git and reverted them. So now I need to find the weak point. With high probability we can say, that it's not the ftp or ssh password abduction. The support specialist of hosting provider (after logs analysis) said that it was the security hole in our code. My questions: 1) What tools should I use, to review access and error logs of Apache? (Our server distro is Debian). 2) Can you write tips of suspicious lines detection in logs? Maybe tutorials or primers of some useful regexps or techniques? 3) How to separate "normal user behavior" from suspicious in logs. 4) Is there any way to preventing attacks in Apache? Thanks for your help.

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  • mount multiple folders with nfs4 on centos

    - by microchasm
    I'm trying to get nfs4 working here. Machine 1 (server) I have a folder and in it 2 other folders I'm trying to share independently. /shared/folder1 /shared/folder2 Problem is, I can't seem to figure out how to mount the folders independently on the client. (Machine 1 - server) /etc/exports: /var/shared/folder1 192.168.200.101(rw,fsid=0,sync) /var/shared/folder2 192.168.200.101(rw,fsid=0,sync) ... exportfs -ra (Machine 2 - client) /etc/fstab: 192.168.200.201:/folder1/ /home/nfsmnt/folder1 nfs4 rw 0 0 ... mount /home/nfsmnt/folder1 mount.nfs4: 192.168.200.201:/folder1/ failed, reason given by server: No such file or directory The folder is there. I'm positive. I think there is something simple I'm missing, but I'm totally missing it. It seems like there should be a way in fstab to tell nfs which folder on the server I want to mount. But I can only find references to what looks like a root mount point (e.g. 192.168.1.1:/) which I assume is handled by exports on the server. But even with the folders set up in exports, there doesn't seem to be an apparent way to pich and choose which gets mounted. Is it not possible to mount separate folders from the same server to different mount points on the client? Any help appreciated.

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  • IPtables rate-limit, What are the differences between modules? Recent, Limit

    - by TechZilla
    I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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  • How to mount remote samba share from local host with multiple groups?

    - by Dragos
    I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 $ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has? Is there a way to: Mount the remote samba with multiple groups on the local system? Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs; but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. And the last solution would be NFS but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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  • How to close all background processes in unix?

    - by Gabi Purcaru
    I have something like: cd project && python manage.py runserver & cd utilities && ./coffee_auto_compiler.py And I want both of them to close on Ctrl-C (or some other command). How can I accomplish that? EDIT: I tried using jobs -x kill and kill `jobs -p `, but it doesn't seem to kill what I need. Here is what I mean: moon 8119 0.0 0.0 7556 3008 pts/0 S 13:17 0:00 /bin/bash moon 8120 6.8 0.4 24568 18928 pts/0 S 13:17 0:00 python manage.py runserver jobs -p give me just process 8119, but I also need to close 8120, since it's the thing that the first command opened. If it helps, the commands are actually in a Makefile, and I want it to run two daemons at the same time (and somehow close them at the same time). And yes, I'm using ubuntu, with bash

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  • SFTP through proxy

    - by aerodynamic_props
    I have a large amount of data on scratch space at computer b that I want to get. In my network I cannot directly connect to computer b (ssh exits with "No route to host"); I must first connect to computer a, and then connect to computer b. I cannot move the data from the scratch space on computer b to computer a because of a disk quota that is imposed on me at computer a. How can I move the data from computer b to my computer in this situation?

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  • openvpn problem

    - by Jared Voronik
    I have a problem with openvpn. I have already setup openvpn sucessfully on some other servers in the past (basic configuration, nothing special). On this server, I used the same config file, but for setting up nat iptables -t nat -A POSTROUTING -s 10.4.0.0/24 -o eth0 -j MASQUERADE doesn't work. It gives error: iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. How do I fix this error? Also, if I can't fix this error, can I do bridging instead of routing? I have only 1 interface, and I can connect to remote server only via ssh (and need to avoid reboots if at all possible) so if briding means a whole ethernet card has to be devoted to the openvpn (and no other servers) then briding is out, otherwise I can use briding. Do you know of a simple, step by step guide to configure openvpn briding (just simple openvpn server and clients that can access internet through vpn server, nothing fancy)?

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  • Heartbeat/DRBD failover didn't work as expected. How do I make the failover more robust?

    - by Quinn Murphy
    I had a scenario where a DRBD-heartbeat set up had a failed node but did not failover. What happened was the primary node had locked up, but didn't go down directly (it was inaccessible via ssh or with the nfs mount, but it could be pinged). The desired behavior would have been to detect this and failover to the secondary node, but it appears that since the primary didn't go full down (there is a dedicated network connection from server to server), heartbeat's detection mechanism didn't pick up on that and therefore didn't failover. Has anyone seen this? Is there something that I need to configure to have more robust cluster failover? DRBD seems to otherwise work fine (had to resync when I rebooted the old primary), but without good failover, it's use is limited. heartbeat 3.0.4 drbd84 RHEL 6.1 We are not using Pacemaker nfs03 is the primary server in this setup, and nfs01 is the secondary. ha.cf # Hearbeat Logging logfacility daemon udpport 694 ucast eth0 192.168.10.47 ucast eth0 192.168.10.42 # Cluster members node nfs01.openair.com node nfs03.openair.com # Hearbeat communication timing. # Sets the triggers and pulse time for swapping over. keepalive 1 warntime 10 deadtime 30 initdead 120 #fail back automatically auto_failback on and here is the haresources file: nfs03.openair.com IPaddr::192.168.10.50/255.255.255.0/eth0 drbddisk::data Filesystem::/dev/drbd0::/data::ext4 nfs nfslock

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  • RHEL 6 vs latest vanilla kernel differences?

    - by Yanko Hernández Álvarez
    What are the differences of the RHEL 6 kernel and the latest kernel.org one? I know RHEL is based on 2.6.32 with some features backported from newer kernels and that it also has other features that are not yet part of the latest vanilla kernel. Is there any comparison of the features of both kernels so I can tell how advanced is the RHEL kernel 6 vs. latest vanilla and vice versa?. It don't have to be the latest kernel at all, but the more recent the vanilla version, the better. What I want to know is: What features I lose/win if I change the RHEL kernel for the latest kernel.org’s one? What features are less matured/developed in the latest vanilla kernel than in RHEL’s (and vice versa)? (I guess KVM virtualization is one of them, but I'm not so sure.) What things (libraries / programs / etc) don’t interact as well with the latest vanilla kernel than with the RHEL’s one? In a related note: Is there ANY way to be as up to date (kernelwise) as possible (using RHEL 6) without loosing too much in the process? (Any way except doing the patching myself, I don’t have the necessary expertise) Any repo I don’t know of? Any alternative? Update: The srpm doesn't include patches (see comments), so that way is not possible. Clarification: I'm interested in how "old" the RHEL kernel gets as time goes by, and to know when the latest upstream kernel includes all the improvements included in the RHEL version.

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  • How to determine the best byte size for the dd command

    - by James
    I know that doing a dd if=/dev/hda of=/dev/hdb does a deep hard drive copy. I've heard that people have been able to speed up the process by increasing the number of bytes that are read and written at a time (512) with the "bs" option. People have suggested that the optimal byte size is due to sector size. I personally think it would have something to do with the amount of cache that the hard drive has. My question is: What determines the ideal byte size for copying from a hard drive? and Why does that determine the ideal byte size?

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  • Sendmail Alias for Nonlocal Email Account

    - by Mark Roddy
    I admin a server which is running a number of web applications for a software dev team (source control, bug tracking, etc). The server has sendmail running solely as a transport to the departmental email server over which I have no control. We have someone who is still in the department but no longer on the dev team so I need to configure the transport agent to redirect all outgoing email (which would be coming from these applications) to the person that has taken their place. I added an entry in /etc/aliases like such: [email protected]: [email protected] But when I run /etc/init.d/sendmail newaliases I get the following error: /etc/mail/aliases: line 32: [email protected]... cannot alias non-local names So clearly I'm doing something I shouldn't. Is there a way to get aliases to work with non-local names or alternatively is their a way to accomplish my goal of redirecting outgoing mail for this user to another one? Technical Specs if the matter: Ubuntu 6.06 sendmail 8.13 (ubuntu provided package)

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  • switchover in postgresql

    - by user1010280
    I am using Postgresql 9.0 with Streaming replication. So, during switchover I follow these steps:- Get the server timestamp on primary. Get the current log position on primary. Set Verify Log location Verify Transaction Received Location Shutdown DB on production. Synchronize the transaction logs from PR to DR. Trigger a failover on the DR Database by creating the trigger file specified in recovery.conf Verify DB Mode on DR Copy the control file from from DR to primary. copy the temporary stats file from DR to primary. copy the history file from DR to primary. Create recovery.conf file. Start Database in standby mode in primary. Verify DB mode on PR At step (6), I have to copy last wal generated on Primary to standby and sync both PR and standby. but this thing takes time to copy files because this remote. So that postgres will keep seraching for wal for long time and after that it stops the server. So I want to know is there any way so that I can ask postgres to stop seraching or locating WAL after shutdown??? because postgres tries to locate this wal every 5 seconds. Please reply as soon as possible..its urgent...

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  • openldap make sure password does not contain username

    - by Ryan Horrisberger
    Is there a way using openldap to ensure that a user's password does not contain their name or their username? I know that you can use the ppolicy overlay pwdCheckModule by writing a C function to do password checking, but is this the best approach? It doesn't seem like many folks are doing password quality checking this way--the only example I've found is a github example which only does basic checking.

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  • Can start-stop-daemon use environmental variables?

    - by scottburton11
    I need to daemonize a Windows app running in Wine, and create a pid in /var/run. Since it requires an X11 session to run, I need to make sure the $DISPLAY variable is set in the running user's environment. Assuming I already have a X11 session running, with a given display, here's what the start-stop-daemon line looks like in my /etc/init.d script: start-stop-daemon --start --pidfile /var/run/wine-app.pid -m -c myuser -g mygroup -k 002 --exec /home/myuser/.wine/drive_c/Program\ Files/wine-app.exe Unfortunately, my version of start-stop-daemon on Ubuntu 8.04 doesn't have the -e option to set environmental variables. I gather that you could simply set $DISPLAY before the command, like so: VAR1="Value" start-stop-daemon ... But it doesn't work. Since I'm using the -c {user} option to run as a specific user, I'm guessing there's an environment switch and VAR1 is lost. I've tried exporting DISPLAY from the running user's .profile and/or .bashrc but it doesn't work either. Is there another way to do this? Is this even possible? Am I overlooking something? Many thanks

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  • How do I re-enable the IPMI temperature sensors?

    - by NobleUplift
    I've never had a problem reading temperature sensors with ipmitool on my server, but recently the temperature readings started showing up as disabled: # ipmitool sdr list Temp | disabled | ns Temp | disabled | ns Ambient Temp | 21 degrees C | ok CMOS Battery | 0x00 | ok VCORE | 0x00 | ok VDDIO | 0x00 | ok VDDA | 0x00 | ok VTT | 0x00 | ok VCORE | 0x00 | ok VDDIO | 0x00 | ok VDDA | 0x00 | ok VTT | 0x00 | ok VDD 1.2V PG | 0x00 | ok Linear PG | 0x00 | ok I am using OpenIPMI 2.0.19 and ipmitool 1.8.12. How can I re-enable my temperature sensors?

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  • Increase memory to memcached

    - by Petrus
    I need to increase the memory size for memcached. I have done this before, but I cannot remember all the steps that I took. If I remember correctly, I downloaded /etc/sysconfig/memcached and changed CACHESIZE=64 to CACHESIZE=1024. However I am not sure if that is how it is supposed to be done. Anyone that could guide me into how I do this? Also a command that confirms the change would be useful. I am running RedHat x86_64 es5.

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  • Raid1 with active and spare partition

    - by Daniel Baron
    I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was therefore marked faulty in the array. The array was then degraded with one active device. Hence, I replaced the harddisk, cloned the partition table and added all new partitions to my raid arrays. After syncing all partitions ended up fine, having 2 active devices - except one of them. The partition which reported the faulty disk before, however, did not include the new partition as an active device but as a spare disk: md3 : active raid1 sdb5[2] sda5[1] 4881344 blocks [2/1] [_U] A detailed look reveals: root@server:~# mdadm --detail /dev/md3 [...] Number Major Minor RaidDevice State 2 8 21 0 spare rebuilding /dev/sdb5 1 8 5 1 active sync /dev/sda5 So here is the question: How do I tell my raid to turn the spare disk into an active one? And why has it been added as a spare device? Recreating or reassembling the array is not an option, because it is my root partition. And I can not find any hints to that subject in the Software Raid HOWTO. Any help would be appreciated. Current Solution I found a solution to my problem, but I am not sure that this is the actual way to do it. Having a closer look at my raid I found that sdb5 was always listed as a spare device: mdadm --examine /dev/sdb5 [...] Number Major Minor RaidDevice State this 2 8 21 2 spare /dev/sdb5 0 0 0 0 0 removed 1 1 8 5 1 active sync /dev/sda5 2 2 8 21 2 spare /dev/sdb5 so readding the device sdb5 to the array md3 always ended up in adding the device as a spare. Finally I just recreated the array mdadm --create /dev/md3 --level=1 -n2 -x0 /dev/sda5 /dev/sdb5 which worked. But the question remains open for me: Is there a better way to manipulate the summaries in the superblock and to tell the array to turn sdb5 from a spare disk to an active disk? I am still curious for an answer.

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  • Error accessing other groups files in apache

    - by Shashank Jain
    I am using Cloud9 IDE on my server, which creates files with default permission 640. As a result when I try to open those file via HTTP, apache shows permission denied error. When IDE is running as root user, files created belong to root:root. Also, when I see as what user is apache running, all its processes are shown to be running as root user. I cannot understand why still it cannot access files. I know if I add apache's user to group of file owner, it will work. But, I don't know which user to add. PS: I don't want to change permission of each file I create. I want less troubling solution.

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  • Debian Bluetooth headphones not working

    - by cYrus
    Hardware Headphones Bluetooth dongle Maybe not exactly these models. Setup I tried to follow some guides, here's what I've done so far: Install software: sudo apt-get install bluez-utils bluez-alsa Reboot (just to be sure): $ dmesg | grep -i bluetooth [ 20.268212] Bluetooth: Core ver 2.16 [ 20.268230] Bluetooth: HCI device and connection manager initialized [ 20.268233] Bluetooth: HCI socket layer initialized [ 20.268235] Bluetooth: L2CAP socket layer initialized [ 20.268239] Bluetooth: SCO socket layer initialized [ 20.284685] Bluetooth: RFCOMM TTY layer initialized [ 20.284692] Bluetooth: RFCOMM socket layer initialized [ 20.284693] Bluetooth: RFCOMM ver 1.11 [ 20.335375] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 20.335378] Bluetooth: BNEP filters: protocol multicast The deamon is running: $ /etc/init.d/bluetooth status [ ok ] bluetooth is running. Plug the dongle: $ dmesg | tail [...] [23108.352034] usb 5-2: new full-speed USB device number 2 using ohci_hcd [23108.571131] usb 5-2: New USB device found, idVendor=0a12, idProduct=0001 [23108.571136] usb 5-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [23108.629042] usbcore: registered new interface driver btusb Put the headphones in pairing mode, and try scanning: $ hcitool scan Scanning ... Found nothing. What's next? What should I try? I'll update this answer as soon as you provide me hints.

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  • infiniband network between 3 servers

    - by grumpf
    Let's say I have 3 different servers, each one with an infiniband card. Each card has 2 different ports. (I don't know about the model yet) Is it possible to create 3 different networks and to allow the 3 servers to communicate with each other without any problems? (and any spof). I guess I just have to setup the /etc/hosts correctly. I really don't know about infiniband, so please help me :) Thanks in advance. EDIT: Point is to NOT USE a switch!

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  • Harddisk formatting with dd return error

    - by Usman Ajmal
    Hi, I tried to format my harddisk (160 GB) with the following command dd if=/dev/zero of=/dev/sda After some 3 hours, following error came up: dd: writing to '/dev/sda' : No space left on device 312581809+0 records in 312581808+0 records out 160041885696 bytes (160 GB) copied, 10708.3 s, 14.9 MB/s Any idea what went wrong?

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