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• Barnyard Service - MySQL Error

  - by SLYN

  I installed barnyard2 and saved as a service. When I run service barnyard2 start, Barnyard2 is failed. After I run tail -100 /var/log/messages and I encounter a fault like this. ERROR database: 'mysql' support is not compiled into this build of snort#012 Aug 22 11:52:06 barnyard2[25771]: FATAL ERROR: If this build of barnyard2 was obtained as a binary distribution (e.g., rpm,#012or Windows), then check for alternate builds that contains the necessary#012'mysql' support.#012#012If this build of barnyard2 was compiled by you, then re-run the#012the ./configure script using the '--with-mysql' switch.#012For non-standard installations of a database, the '--with-mysql=DIR'#012syntax may need to be used to specify the base directory of the DB install.#012#012See the database documentation for cursory details (doc/README.database).#012and the URL to the most recent database plugin documentation. Aug 22 11:52:06 barnyard2[25771]: Barnyard2 exiting What sould I do for solving this problem? When I installed Barnyard2, I used these commands: # ./configure --with-mysql --with-mysql-libraries=/usr/lib64/mysql # make ; make install (My System is CentOS 6.5 x86_64.)

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• What is the bash syntax to create a new directory in the directory above?

  - by mozerella

  I aim to make a script for mogrify. The mogrify command will resize images in a directory and put the resized images into a directory on the same directory level, with the same name as the work directory, but with a suffix (_a). The new directory will be moved to another collection later on. Something like this, #!/bin/bash mkdir ../n_a for file in *{.JPG|.jpg}; do mogrify -path ../n_a -resize 1200x1200 -quality 96;done I'm guessing ../ denotes the parent dir when working in a child directory, but I need help here. Edit: "n" needs to be replaced with the syntax for the working directory name. Sorry there was a typo as well third script line, should have read n not x Edit2: This script does exactly what I need and it's silent. #!/bin/bash DEST="../${PWD##*/}_a" mkdir -p $DEST mogrify -path $DEST -resize 1200x1200 -quality 96 *.jpg *.JPG thanks to vgoff for the correct PWD syntax and cesareriva http://www.cesareriva.com/archives/722 for showing me the DEST function. Something else: ${PWD##*/}_a is not caring for spaces in the directory name and the script fails. An empty dir is created in the same dir as the images. Found it out now, it needs quotations on the $DEST too, presumably to help mkdir create the dir with a space in the name, and mogrify to write the files to the right place, like this #!/bin/bash DEST="../${PWD##*/}_a" mkdir -p "$DEST" mogrify -path "$DEST" -resize 1200x1200 -quality 96 *.jpg *.JPG

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• Setting up a transparent proxy with only one box.

  - by Scott Chamberlain

  I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated. The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.

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• Display CPU usage separately (without root privileges)

  - by synaptik

  I need to display the CPU usage for each processing core on a single shared-memory 12-core (SMP) machine. I don't have access to install htop, else I would simply use that. I don't need fancy graphs or meters, though they would be nice. For example, simply displaying: X X X X X X X X X X X X where each X is the percentage utilization of 1 of the 12 processing cores on my machine. FYI: I know I can simply look at the utilization in "top" and divide that number by the number of cores on my machine, but I prefer a solution that shows each core separately.

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• Raid 5 GPT Partitioning

  - by user39325

  I have a Dell Poweredge r710 server with five 1 TB disks. All of them are in RAID 5. I was trying to install Centos but it says "Your boot partition is on disk using GPT Partition..." I read somewhere that centos can't install on a disk larger than 2TB, so I made some partitions smaller, but it's not working. PS, I am going to install Proxmox on that, but Proxmox also won't accept disks larger than 2TB.

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• What is the `shadow` group used for?

  - by Shtééf

  On my Ubuntu 9.10 system, there's a shadow system group. There does not appear to be any user assigned to this group at all. The only files that I can find belonging to this group are /etc/shadow and /etc/gshadow. I'm aware that the purpose of these files is to store the passwords separately, out of reach from regular users who still might want to access passwd for other reasons. But what is the purpose of the shadow group? The reason I'm curious about this, is because I'm thinking about configuring nsswitch.conf to store it elsewhere, and would like to know if anything is actually trying to access the shadow database using shadow group credentials.

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• Almost All Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top.

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• mpstat on slackware 13.0 shows no utilization

  - by conartist6

  As the title says, the mpstat command, executed on Slack 13.0 continuously shows almost no processor utilization of any sort. In fact none of the output ever seems to change at all. The system is dual processor board with two hyperthreaded P4 Xeons. Any ideas? 08:50:06 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 08:50:06 PM all 0.38 0.00 0.03 0.03 0.00 0.00 0.00 99.56 1510.46 08:50:06 PM 0 0.50 0.00 0.05 0.10 0.00 0.01 0.00 99.33 11.90 08:50:06 PM 1 0.32 0.00 0.03 0.01 0.00 0.00 0.00 99.64 0.00 08:50:06 PM 2 0.38 0.00 0.03 0.01 0.00 0.00 0.00 99.58 0.00 08:50:06 PM 3 0.29 0.00 0.02 0.00 0.00 0.00 0.00 99.68 0.00 This is, literally, the only output I can get from the program. No values change ever.

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• Mail Secure & Stable Open Source Mail Server

  - by Fanar ALHAYALI

  I have asked question on http://stackoverflow.com/questions/9868426/i-need-to-know-which-email-server-i-have-to-use and someone tell me my question would be better on serverfault. I know that this is a common question and asked many times. but there are so many available mail servers that i am not able to decide the one. Kindly tell that which is the Secure, Stable and fast open source mail server for Centos or Redhat Server. Is there any guide which can be used to deploy the mail server with all its components e.g. smtp, pop3, imap, spam, calender server, antivirus, DNS Setting. Currently I'm using sun messaging V6 which installed on Solaris 10 and my boss ask me to make a report for the best mail server today in the marketing? I tried to have a look on Google but I couldn't find interesting information for my report. Any advice would be appreciated.

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• Weird nfs performance: 1 thread better than 8, 8 better than 2!

  - by Joe

  I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a 1GB file on the client is much lower than what would be expected based on the measured network connection speed between the two VMs and the measured speed of reading the file directly on the server. The VMs are running Ubuntu 9.04 and the server is using the nfs-kernel-server package. According to various NFS tuning resources, changing the number of nfsd threads (in my case kernel threads) can affect performance. Usually this advice is framed in terms of increasing the number from the default of 8 on heavily-used servers. What I find in my current configuration: RPCNFSDCOUNT=8: (default): 13.5-30 seconds to cat a 1GB file on the client so 35-80MB/sec RPCNFSDCOUNT=16: 18s to cat the file 60MB/s RPCNFSDCOUNT=1: 8-9 seconds to cat the file (!!?!) 125MB/s RPCNFSDCOUNT=2: 87s to cat the file 12MB/s I should mention that the file I'm exporting is on a RevoDrive SSD mounted on the server using Xen's PCI-passthrough; on the server I can cat the file in under seconds ( 250MB/s). I am dropping caches on the client before each test. I don't really want to leave the server configured with just one thread as I'm guessing that won't work so well when there are multiple clients, but I might be misunderstanding how that works. I have repeated the tests a few times (changing the server config in between) and the results are fairly consistent. So my question is: why is the best performance with 1 thread? A few other things I have tried changing, to little or no effect: increasing the values of /proc/sys/net/ipv4/ipfrag_low_thresh and /proc/sys/net/ipv4/ipfrag_high_thresh to 512K, 1M from the default 192K,256K increasing the value of /proc/sys/net/core/rmem_default and /proc/sys/net/core/rmem_max to 1M from the default of 128K mounting with client options rsize=32768, wsize=32768 From the output of sar -d I understand that the actual read sizes going to the underlying device are rather small (<100 bytes) but this doesn't cause a problem when reading the file locally on the client. The RevoDrive actually exposes two "SATA" devices /dev/sda and /dev/sdb, then dmraid picks up a fakeRAID-0 striped across them which I have mounted to /mnt/ssd and then bind-mounted to /export/ssd. I've done local tests on my file using both locations and see the good performance mentioned above. If answers/comments ask for more details I will add them.

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• XFS: No space left on device

  - by beketa

  I am using XFS on small HDD (/dev/sdb1, less than 1TB) and storing many small files (-32KB). df -h and -i show that it has available space. # df -hv Filesystem Size Used Avail Use% Mounted on /dev/sda3 127G 19G 102G 16% / tmpfs 16G 0 16G 0% /lib/init/rw udev 16G 168K 16G 1% /dev tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 99M 20M 75M 21% /boot /dev/sdb1 136G 123G 14G 91% /mnt/sdb1 # df -iv Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 8421376 36199 8385177 1% / tmpfs 4126158 5 4126153 1% /lib/init/rw udev 4124934 671 4124263 1% /dev tmpfs 4126158 1 4126157 1% /dev/shm /dev/sda1 26112 222 25890 1% /boot /dev/sdb1 24905120 11076608 13828512 45% /mnt/sdb1 However I got No space left on device error. # touch /mnt/sdb1/test touch: cannot touch `/mnt/sdb1/test': No space left on device I think inode64 issue is not related to this case because drive is less than 1TB and df -i shows that there are free inodes. I unmounted and mounted with -o inode64 but got the same error. xfs_repair does not report any problem. xfs_info shows drive information as follows. # xfs_info /dev/sdb1 meta-data=/dev/sdb1 isize=1024 agcount=16, agsize=2227764 blks = sectsz=512 attr=2 data = bsize=4096 blocks=35644210, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=17404, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 Any ideas? Thanks!

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• Single application through OpenVPN tunnel (Debian Lenny)

  - by user14124

  I'm using Debian Lenny and I want to tunnel rtorrent only through a OpenVPN tunnel. I have a tunnel running, the config file looks like this: client dev tun proto udp remote openvpn.xxx.com 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/xxx/keys/ca.crt cert /etc/openvpn/xxx/keys/client.crt key /etc/openvpn/xxx/keys/client.key tls-auth /etc/openvpn/xxx/keys/tls.key 1 ns-cert-type server comp-lzo verb 3 auth-user-pass script-security 3 reneg-sec 0 My idea is that I could run a sockd proxy internally that redirects traffic to the openvpn tunnel. I could use the *nix "proxifier" application "tsocks" to make it possible for rtorrent to connect through that proxy (as rtorrent doesn't support proxies). I have trouble configuring sockd as my IP inside the VPN changes every time I connect. This is a config file someone said would help: http://ircpimps.org/sockd.conf As my IP changes at each connect I don't know what to put in that config file. I have no control over the host side config file. Any help wanted. Any other method is very welcome.

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• How to get the speed of a network card on the command line?

  - by nelaar

  I am trying to see what the speed of some network cards on a remote server. Our reporting software says they are 10Mbps, but I am sure that is wrong they should be 1Gbps. Our monitoring software uses SNMP to query the servers, perhaps the servers are reporting information incorrectly. ifconfig does not report what the speed of the devices are. How can I see what the currently configured speed of the cards are.

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• Basic connectivity issues between Win 7 and XP mixed wired/wireless network. [Solved]

  - by Pulse

  Setup: Windows 7 x64 Ultimate desktop hard wired to Asus WL500gp router (WL500gpv2-1.9.2.7-d-r1445 firmware) Several Bridged VirtualBox VM's running XP, 7, ubuntu server 10.04, Mint 9 and SuSE 11.2 Win XP Pro SP3 notebook with D-Link Airplus wireless network card. No firewall or other security software currently running on either platform (at least for the duration of the test) Situation: Router is acting DHCP server Clients are receiving correct addresses and additional parameters Internet connectivity is available from all clients Windows 7 sharing is set to Network type = work (not home group) NetBT is disabled on all clients using smb over TCP What I can do: I can ping the router and internet addresses from the wireless XP notebook I can ping the Win 7 desktop and any VM from the XP wireless notebook I can ping all devices from the router All VM's and 7 can ping each other and the router as well as Internet addresses What I can't do: I cannot ping the XP wireless notebook from either the Win 7 desktop or the VM's; it always returns a destination host unreachable error. Tracert resolves the name or the XP notebook but also returns a destination host unreachable. From the above it would seem that something is blocking connectivity in a single direction (from the Win 7 box to the Win XP notebook) only but the router can ping the XP notebook. Some fresh input would be most welcome, as this is beginning to drive me batty. Thanks

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• How to detect if all the device on my machine have proper drivers?

  - by smwikipedia

  I have just installed the Xubuntu 10.04. But the display seems to be latency. When I try to copy a big file from usb disk to hard disk, the CPU is 100% used. So I doubt that some device drivers are missing. I can use lspci to show the PCI devices on my machine, but how could I tell whether proper drivers have been installed or not? Many thanks.

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• How to troubleshoot this memory usage?

  - by Camran

  I have a classifieds website. I use PHP, MySql, and SOLR. Solr uses a Servlet Container, in my case JETTY, which is java application. I just noticed that something was terribly wrong on my website. I opened the terminal and entered the "top" command and noticed that JAVA was EATING all the cpu and mem. Now I thought "Ok, maybe I need more mem and cpu" So I increased it. But along with the increase the java app started eating more. This has never happened before, and it is either a bug, or a hack of some kind. Anyways, I need to troubleshoot this now, and so I wonder how do I do this? Can I somehow pinpoint exactly when the memory usage started to go up from some error log? How does one troubleshoot this? How do I prevent it? Is it possible to prevent too many requests somehow, if they are within a timeline? Thanks

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• How to Extending a logical volume in WMWare

  - by Mercer

  down vote favorite i have a CentOS 6.3 into my Virtual Machine. I have 2 Disk: Disk#1 = 18G Disk#2 = 20G [root@vm ~]# df -h Filesystem Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_system-lv_root 1008M 250M 708M 27% / tmpfs 1.9G 0 1.9G 0% /dev/shm /dev/sda1 194M 31M 154M 17% /boot /dev/mapper/vg_system-lv_home 504M 17M 462M 4% /home /dev/mapper/vg_system-lv_opt 2.0G 68M 1.9G 4% /opt /dev/mapper/vg_produits-lv_grid 6.9G 2.5G 4.1G 38% /opt/grid /dev/mapper/vg_produits-lv_oracle 6.9G 144M 6.4G 3% /opt/oracle /dev/mapper/vg_system-lv_tmp 2.8G 71M 2.6G 3% /tmp /dev/mapper/vg_system-lv_usr 2.5G 1.6G 799M 67% /usr /dev/mapper/vg_system-lv_var 2.0G 278M 1.6G 15% /var So i want to extend my /tmp and my /opt/oracle like this: 10Go in/tmp 13Go in /opt/oracle Thx.

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• Sub $300 machine.

  - by Moshe

  Preferably not a netbook, please. should support windows7 at a normal speed.

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• Puppet: is it ok to "force" certname when you expect to shuffle nodes around?

  - by Luke404

  We all know (good example on SF) that Puppet hostname detection could be... fun. At our company (and I guess we're not alone at this) we usually pre-configure servers at our offices and test them before bringing the gear to a remote datacenter and rack them. Of course the reverse dns will change when doing that, even if we don't change the actual hostname of the system. We're slowly drafting our puppet setup and I'd like to be sure those moves won't create problems. My idea is to explicitly configure the desired full FQDN of the system as certname in puppet.conf at server provision time (before the very first puppet run). My process would look something like this: basic o.s. installation basic network configuration, enough to reach the internet and resolve dns install puppet and set up certname start puppet and let him manage the whole configuration test, fix problems in config (via puppet), re-test, and so on... manually stop puppet set up new network configuration for the datacenter network move the machine to DC turn it on puppet should automatically start and keep on doing its job The process is supported by detecting the environment in puppet's manifests (eg. based on subnet, like they do at Wikimedia) and modify configuration as needed (eg. resolv.conf contents appropriate for each network). Each node's certname will never change for the whole system life cycle. Is there any problem with this approach? Could it be improved?

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• Set LD_LIBRARY_PATH and CLASSPATH on cluster nodes before running a hadoop job

  - by Ashish Sharma

  I need to set LD_LIBRARY_PATH and CLASSPATH before running a job a cluster. In LD_LIBRARY_PATH i need to add location of some jars which are required while running the job, As these jars are avaiable at my cluster, similar with CLASSPATH. I have a 3 NODE cluster, I need to set this LD_LIBRARY_PATH and CLASSPATH for all the 3 data nodes so that the following jar are available while running the job

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• can't run binaries or shell scripts

  - by hyperboreean

  I am running Debian testing and I am not able to run any binary or shell script. I keep getting "No such file or directory". The umask is the default one and I haven't fooled around with the paths. Also, I am aware of this question, but it doesn't work out for me - I compiled my code on this machine and trying to run it on the same machine. Also, all of my shell scripts have the correct shebang. Any advices?

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• Permission denied when trying to execute a binary burned to a CD-R

  - by user16654

  On an Ubuntu 9.10 (Karmic Koala) machine, I burned a CD from the command prompt using: cdrecord -v speed=16 dev=0,1,0 /FPS.iso The CD now contains an executable and some files. I tested the CD by loading it onto another machine (Red Hat 5.3) and when I try to run the program I get the following message: bash: ./FPS1_1: Permission denied I can open other files like text documents (the executable also comes with shared libraries). I realized I had burned the CD as root so I burned another one as another user but I still have the same problem. How can I remove this permission or what is the problem? P.S. the image was in / if that helps

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• How to restrict all services to single domain in Ubuntu?

  - by harold

  Someone has pointed an unknown domain to my server's IP address likely via A records. I would like to reject access to ALL services (httpd, ssh, mail, etc.) from this domain and only allow requests from my domain. I want to make it so when I connect to that domain it's completely rejected from my server. I can disallow access from HTTP by changing my web server settings, but I want to do this for every single type of connection. How can I do this?

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• Why do we see multiple PID's related to same application/owner for http like this below. What does this mean?

  - by Muthukumar Alagappan

  Why do we see multiple PID's related to same application/owner for http like this below. What does this mean?. $ ps -ef | grep httpd | grep -v grep apache 9619 20181 0 07:08 ? 00:00:03 /usr/sbin/httpd apache 10092 20181 0 Jan24 ? 00:00:07 /usr/sbin/httpd apache 13086 20181 0 06:09 ? 00:00:00 /usr/sbin/httpd apache 13717 20181 0 Jan25 ? 00:00:01 /usr/sbin/httpd apache 14730 20181 0 07:13 ? 00:00:01 /usr/sbin/httpd apache 16359 20181 0 09:54 ? 00:00:00 /usr/sbin/httpd root 20181 1 0 2011 ? 00:00:01 /usr/sbin/httpd apache 21450 20181 0 09:55 ? 00:00:00 /usr/sbin/httpd

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• How expensive is a hostname in htaccess? Other solutions possible?

  - by Nanne

  For easy allow or disallowing of dynamic IP-adresses you can add them as a hostname in a .htaccess file. As I have read from: .htaccess allow from hostname? it does a reverse lookup on the connecting ip address, seeing if the response matches the allowed name. (Well, actually Apache is doing a double lookup, first a reverse lookup and then a forward lookup on the result of the reverse.) This is the reason we are currently not using dynamic-ip hostnames in the .htaccess: this "sounds" quite heavy: 2 extra lookups for every request. Is this indeed quite heavy, and would a reasonably busy server that is rather looking for less then more load get away with this :)? (e.g.: how does this 'load' compare to the rest? If a request is 1000 times more expensive then the lookups it might be negligible. otoh, it could be that final straw :) ) Are there other solutions? I can write a script that does a lookup of the hostname and put it in .htaccess files ofcourse, but this feels a bit like a hack.

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