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• Rpm removal does not remove delivered dirs and leaves garbage

  - by Jim

  I deliver an application via an RPM. This application delivers various directories and files. E.g. under /opt/internal/com a file structure is being copied. I was expecting that on rpm -e all the file structure delivered under /opt/internal/com will be removed. But it does not. There are directories in the file structure that are non-empty. Is this the reason? But these (non-empty) directories were created by the RPM installation. So I would expect that they would be "owned" by RPM and removed automatically. Is this wrong? Am I supposed to remove them manually?

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• Triggering GDM login on a remote machine

  - by creator

  I have to briefly describe the situation. We are planning to make a computer classroom with workstations running Ubuntu 10.04. Since making accounts for each student has not been considered reasonable, we decided to make accounts for each student group. We don't want students to share their passwords between groups so the solution would be not to give them passwords at all, but let the teacher log them in instead. Obviously he shouldn't go from one machine to another typing in credentials by hand, so we need some script that will connect to a remote machine by ssh and make GDM (or probably any other login manager if GDM cannot serve this purpose) log in specified user. I couldn't find any solutions, as well as I haven't noticed anybody in similar situation asking for help, so my question will be: can the scheme described be realized and if yes, then how? Thanks in advance.

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• cannot find java even though it is there (ubuntu 12.04)

  - by Jeff Storey

  I'm trying to just execute the java command and it's saying it cannot be found, even though it is there. Here's what my output looks like root@oneiric:/usr/lib/jvm/default-java/bin# ls -al java -rwxrwxrwx 1 uucp 143 5750 2012-09-20 11:14 java root@oneiric:/usr/lib/jvm/default-java/bin# ./java -su: ./java: No such file or directory So the ls shows it's there, but it doesn't seem to execute. Can someone explain why this is?

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• how to properly edit hosts, hostname and resolf.conf? [migrated]

  - by Firewall

  i,v been searching the internet for a real noop tutorial on the subject but could not found any direct info. on how to edit these files the proper way. i,v got a debian internet server that i use to host some personal domains and runs squid and rTorrent. the server is up and running with no problems but i am confused about a few things. lets say that i named my server (foo), my domain is (example.com) and my public IP is 95.211.133.200 now: should /etc/hostname contains: tango.example.com or tango <----- just the server name should /etc/hosts contains: 127.0.0.1 localhost.localdomain localhost 95.211.133.200 foo.example.com foo should /etc/resolf.conf contains (along with the nameservers) both: domain example.com search example.com or just the first one. are there any other files that i should edit in order to make things right? last thing, the command: domainname returns: (none) i believe it should return (example.com). what should i do to correct that?

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• VPS, what to install next?

  - by Camran

  I have my VPS now, with ubuntu 9.10 OS. I wonder about SSH. What is it for, and how do I use it? Also, in which order should I install apps on my server? (ex: PuTTY, IPTABLES, LAMP etc...)? Thanks

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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's wrong with this iptable rule?

  - by warl0ck

  I run dnsmasq locally as a cache server, in the old days, I allow all INPUT packets from lo+, and set policy of INPUT to DROP: -A INPUT -i lo+ -j ACCEPT Now I decide to put this on the raw table to speed up rules matching, -A PREROUTING -i lo+ -j ACCEPT But that doesn't work as expected. Why? Since the packets get processed by the raw table first, then nat, then filter, why isn't that rule work the same as the old one?

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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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• What's the reason to break HDD to few partitions for MDADM+LVM2?

  - by archer

  I'm using 2 HDDs each 1TB in size. I'm going to create MDADM+LVM2 over them. Initially I though about this partition layout: /dev/sda1 - 1Gb (boot) /dev/sda2 - 500Gb (md0) /dev/sda3 - 499Gb (md1) /dev/sdb1 - 1Gb (boot) /dev/sdb2 - 500Gb (md0) /dev/sdb3 - 499Gb (md1) md0 is going to be raid0 and md1 is going to be raid1 however, I found some info that this would be better to break each drive to more partitions (lets say 10 partitions 100Gb in size each). What's the reason of doing that?

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• Are PHP session files ever deleted?

  - by GetFree

  I see there are thousands of files in my "/tmp" directory (a CentOS machine) and almost all of them are PHP session files. I'm worried about the possible impact this might have on my system. Are those files ever deleted either by the OS, Apache or PHP? or I have to take care of it myself?

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• Is it safe to run two instances of svnserve on one repository, or only one?

  - by fredden

  We've two nodes running heartbeat/drbd, and one of the services we're using is subversion. What I want to know is: is it safe to run svnserve on both nodes all the time, or should it only run on the active node? Does svnserve use file-level locking, or is it all in memory? What are the implications of running svnserve without its repositories accessible? Please let me know if this isn't clear, and I'll try my best to rephrase/clarify. :)

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• /var/tmp and file lifetime

  - by clorz

  Hi everyone I've got a cronjob that runs every minute and checks existence of a certain file. If there's no such file, job silently ends. If there is a file, then another script is started. That script removes the file when done. Its execution time can take up to 20 minutes. My questions are: Are there any flaws in this scheme? Is it ok to store such file in tmp? Can I be shure that nothing will attempt to remove it?

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• Samba domain controller: remove 1 Windows client

  - by K B

  my domain is controlled by a Samba domain controller running on openSUSE 11.3. It manages other openSUSE boxes and some Windows 7 boxes. Now one harddisk of a Windows 7 computer crashed and I had to reinstall. I wasn't able to get the computer name ("Win26") of the broken PC out of the domain and so I couldn't add the reinstalled "Win26" to the domain again. So how can I remove the entry of the old "Win26" computer out of the domain controller, so that I can add the new "Win26" to the domain again? Is it one configuration file I have to edit and restart Samba? Which file would this be? Thanks in advance for your help! Regards, KB

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• scsi and ata entries for same hard drive under /dev/disk/by-id

  - by John Dibling

  I am trying to set up a ZFS pool using 4 bare drives which I have attached to my Ubuntu system via a SATA hot swap backplane. These are Hitachi SATA drives. When I list the contents of /dev/disk/by-id, I see two entries for each drive: root@scorpius:/dev/disk/by-id# ls | grep Hitachi ata-Hitachi_HDS5C3030ALA630_MJ1323YNG0ZJ7C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1064C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG190AC ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1DGPC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG0ZJ7C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1064C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG190AC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1DGPC I know these are the same drives because I wrote down the serial numbers, and all the other drives in this system are either Seagate or WD. The serial number for the first one, for example, is YNG0ZJ7C. Why are there two entries here for each drive? More to the point, when I create my ZFS pool which one should I use; the scsi- one or the ata- one?

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• ACL permissions not behaving as expected

  - by Yarin

  I set the following ACL on my web directory: setfacl -R -d -m mask:002 /var/www and then created a file as root that I expected to be readable by the default (apache) group. -rw--w-r--+ 1 root apache 0 Dec 17 22:32 newfile.py When I run getfacl on the file, I get: # file: newfile.py # owner: root # group: apache user::rw- group::rwx #effective:-w- mask::-w- other::r-- I'm not sure how to read this- but all I know is that the webserver is throwing a permissions error because apache can't read the file. Can anyone explain what is going on here?

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• VPS stops responding every now and again

  - by Or W

  I have a Linode vps that I use to host some of my websites on. It's Ubuntu based and it's up to date in terms of all packages. I don't have any cron jobs scheduled or any automatic processes. I host a few (up to date) wordpress blogs there that have very little traffic altogether. Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager. On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k). When I reboot the server everything is just fine. I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up. How can I determine the problem?

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• IPTables configuration help

  - by Sam

  I'm after some help with setting up IPTables. Mostly the configuration is working, but regardless of what I try I cannot allow localhost to access the local Apache only (i.e. localhost to access localhost:80 only). Here is my script: !/bin/bash Allow root to access external web and ftp iptables -t filter -A OUTPUT -p tcp --dport 21 --match owner --uid-owner 0 -j ACCEPT iptables -t filter -A OUTPUT -p tcp --dport 80 --match owner --uid-owner 0 -j ACCEPT Allow DNS queries iptables -A OUTPUT -p udp --dport 53 -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT Allow in and outbound SSH to/from any server iptables -A INPUT -p tcp -s 0/0 --dport 22 -j ACCEPT iptables -A OUTPUT -p tcp -d 0/0 --sport 22 -j ACCEPT Accept ICMP requests iptables -A INPUT -p icmp -s 0/0 -j ACCEPT iptables -A OUTPUT -p icmp -d 0/0 -j ACCEPT Accept connections from any local machines but disallow localhost access to networked machines iptables -A INPUT -s 10.0.1.0/24 -j ACCEPT iptables -A OUTPUT -d 10.0.1.0/24 -j DROP Drop ALL other traffic iptables -A OUTPUT -p tcp -d 0/0 -j DROP iptables -A OUTPUT -p udp -d 0/0 -j DROP Now I have tried many permutations and I'm obviously missing everything. I place them above the in/out bound SSH to/from, so it's not the precedence order. If someone could give me the heads up on allowing only the local machine to access the local web server, that'd be great. Cheers guys.

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• free -m output, should I be concerend about this servers low memory?

  - by Michael

  This is the output of free -m on a production database (MySQL with machine. 83MB looks pretty bad, but I assume the buffer/cache will be used instead of Swap? [admin@db1 www]$ free -m total used free shared buffers cached Mem: 16053 15970 83 0 122 5343 -/+ buffers/cache: 10504 5549 Swap: 2047 0 2047 top ouptut sorted by memory: top - 10:51:35 up 140 days, 7:58, 1 user, load average: 2.01, 1.47, 1.23 Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie Cpu(s): 6.5%us, 1.2%sy, 0.0%ni, 60.2%id, 31.5%wa, 0.2%hi, 0.5%si, 0.0%st Mem: 16439060k total, 16353940k used, 85120k free, 122056k buffers Swap: 2096472k total, 104k used, 2096368k free, 5461160k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20757 mysql 15 0 10.2g 9.7g 5440 S 29.0 61.6 28588:24 mysqld 16610 root 15 0 184m 18m 4340 S 0.0 0.1 0:32.89 sysshepd 9394 root 15 0 154m 8336 4244 S 0.0 0.1 0:12.20 snmpd 17481 ntp 15 0 23416 5044 3916 S 0.0 0.0 0:02.32 ntpd 2000 root 5 -10 12652 4464 3184 S 0.0 0.0 0:00.00 iscsid 8768 root 15 0 90164 3376 2644 S 0.0 0.0 0:00.01 sshd

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• How to map Ctrl + ',' to greater key( '>') or Ctrl + '.' to less key( '<' ) using xmodmap?

  - by Maxrunner

  So im trying to creating a combination of keys to generate the ISO key for Portuguese layout, the key in question is the <, pressing it normally will generate the '<' character, pressing + shift will generate the ' ' character. So i'm trying to create a combination while using xmodmap, and i want this to work for all programs.I've been searching on Google and came up with this example for Control + P = Up: Control + p = Up arrow example The example for that behaviour is: xmodmap -e "keycode 33 = p P Up" keycode 33 matches the p key, so where does control comes up in that command? regards,

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• sendmail appends server name to external domains when relaying

  - by Chris

  My server is set to send all email to a corporate relay server. For the company domain, it works perfectly. I've recently found emails being sent to an outside domain are getting the hostname of my server appended to the email prior to being sent. Here is the log entry for one such attempt. Nov 6 09:46:45 myservername sendmail[45023]: rA6EkjiI045023: [email protected], delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30590, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (rA6Ekj2g045037 Message accepted for delivery) Nov 6 09:46:45 myservername sendmail[45061]: rA6Ekj2g045037: to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120885, relay=relay.company.com [x.x.x.x], dsn=2.0.0, stat=Sent (ok: Message 342335947 accepted) Notice the email address difference between it being accepted by my server for delivery (correct email address), and being sent and accepted by the corporate relay (incorrect with server name appended). To make it more interesting, the application on my server uses email for user account verification/activation. In August, this particular user was able to register his account and activate it. I have made no configuration changes to mail since setting the server up over a year ago. DNS is also a corporate service. I've never touched my /etc/resolv.conf configuration. domain company.com nameserver <ip1> nameserver <ip2> search myservername Thanks!

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• Ubuntu: Memory Leak

  - by Keener

  I'm having trouble finding from where this memory leak is occurring. I'm running Ubuntu 8.04 LTS on a Dell XPS M1530. I have 3GB of ram and I'm finding after about an hour or so of use top shows me 2GBs+ used. The strange thing is when I add up the memory percentages by PID either from top or ps aux I find that I should only be using about 20-25% of my available ram. What brought this to my attention was I've begun running vmware server again. Now, obviously the ram usage spikes when I load a virtual machine, but the memory VMware is using does not account for the memory usage I'm seeing via top or free. Stopping vmware server releases the memory which was allocated to it, but I'm still unable to find where this RAM is being used. After a complete reboot, of course, the memory is fine, but very quickly it climbs to 60-80% usage with the processes only appearing to account for a third of that. Any ideas where I should look for more information on what this could be?

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• View all files with permission 777

  - by Webnet

  Is it possible for me to view all files on the server with a specific permission?

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• Accidental Extract Location - How to Clean Up?

  - by Gordon

  Sometimes I will do a command such as unzip tons_of_files.zip And I will forget to put a -d to point to a subdirectory. This causes the current folder to get filled with tons of files that are intermixed with the existing files. What is the best way to remove all these new files and/or move them to a new directory? I want to avoid having to manually examine the directory and determine if the file was part of the archive or was already present.

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• LAMP Stack Version Help -- Is there a website or version tracker source to help suggest the right versions of each part of a platform stack?

  - by Chris Adragna

  Taken singly, it's easy to research versions and compatibility. Version information is readily available on each single part of a platform stack, such as MySQL. You can find out the latest version, stable version, and sometimes even the percentage of people adopting it by version (personally, I like seeing numbers on adoption rates). However, when trying to find the best possible mix of versions, I have a harder time. For example, "if you're using MySQL 5.5, you'll need PHP version XX or higher." It gets even more difficult to mitigate when you throw higher level platforms into the mix such as Drupal, Joomla, etc. I do consider "wizard" like installers to be beneficial, such as the Bitnami installers. However, I always wonder if those solutions cater more to the least common denominator -- be all to many -- and as such, I think I'd be better to install things on my own. Such solutions do seem kind of slow to adopt new versions, slower than necessary, I suspect. Is there a website or tool that consolidates versioning data in order to help a webmaster choose which versions to deploy or which upgrades to install, in consideration of all the other parts of the stack?

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• push commits to git (gitolite) repository messes up file permissions (no more trac access)

  - by klemens

  already posted here so feel free to answer there. everytime i commit/push something to the git server the file permissions change (all added/edited files in the repository have no read and execute access for the group). thus trac can't access the repository. do I need to change permissions of the folder differently? chmod u=rwx,g=rx,o= -R /home/git/repositories or do i need to setup gitolite somehow to write files with different permissions??? regards, klemens

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