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• Expanding globs in xargs

  - by Craig

  I have a directory like this mkdir test cd test touch file{0,1}.txt otherfile{0,1}.txt stuff{0,1}.txt I want to run some command such as ls on certain types of files in the directory and have the * (glob) expand to all possibilities for the filename. echo 'file otherfile' | tr ' ' '\n' | xargs -I % ls %*.txt This command does not expand the glob and tries to look for the literal 'file*.txt' How do I write a similar command that expands the globs? (I want to use xargs so the command can be run in parallel)

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• Permissions problem on mounting afp drive

  - by Ron Gejman

  I am trying to mount a network drive via AFP on an Ubuntu 10.04 server machine. After installing AFP support, I use the following command: sudo mount_afp afp://USER:[email protected]/directory/ /media/dir This seems to work and it tells me that mounting succeeded. However, when I navigate to /media/dir I get the following error: cd: cfs: Input/output error Permissions in /media are: d????????? ? ? ? ? dir/ drwx------ 12 user 4.0K 2010-10-25 16:08 otherdisk/ So there is a permissions problem here. I eventually want to mount this drive automatically using fstab. What do I need to do to make the disk accessible?

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• Using Styles, Themes, and Painters with LWUIT

  - by OracleTechnologyNetwork

  Learn about the changes in LWUIT (Lightweight User Interface Toolkit)1.3 with respect to Style, Table, and Spinner.

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• RAID FS detection at boot time

  - by alex

  An excerpt from dmesg: md: Autodetecting RAID arrays. md: Scanned 2 and added 2 devices. md: autorun ... md: considering sdb1 ... md: adding sdb1 ... md: adding sda1 ... md: created md1 md: bind<sda1> md: bind<sdb1> md: running: <sdb1><sda1> raid1: raid set md1 active with 2 out of 2 mirrors md1: detected capacity change from 0 to 1500299198464 md: ... autorun DONE. md1: unknown partition table EXT3-fs (md1): error: couldn't mount because of unsupported optional features (240) EXT2-fs (md1): error: couldn't mount because of unsupported optional features (240) EXT4-fs (md1): mounted filesystem with ordered data mode Is it OK that kernel tries to mount an ext4 raid as ext3, ext2 first? Is there a way to tell it to skip those two steps? Just in case: /dev/md1 / ext4 noatime 0 1 TIA.

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• How to use supervisord to run a PHP script as a daemon?

  - by Alasdair

  I need to have 8 threads of the same PHP script running in the background on a server continuously (as a daemon), and each script need to be automatically restarted if it exits for any reason. I've been advised to use supervisord to do this, but I don't at all understand their documentation, which seems very complicated to me. I also want each of the 8 threads of the script to be initially started at 2 minute intervals (2 minutes in between each launch) but then after this all 8 threads of the same PHP script should continue running on the server forever (and restarting if any exit for any reason). Could someone please explain how to do this with supervisord, or any other easy way of doing it? I'm on CentOS 6. Thank you!

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• MySQL Cluster 7.2: Over 8x Higher Performance than Cluster 7.1

  - by Mat Keep

  0 0 1 893 5092 Homework 42 11 5974 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US;} Summary The scalability enhancements delivered by extensions to multi-threaded data nodes enables MySQL Cluster 7.2 to deliver over 8x higher performance than the previous MySQL Cluster 7.1 release on a recent benchmark What’s New in MySQL Cluster 7.2 MySQL Cluster 7.2 was released as GA (Generally Available) in February 2012, delivering many enhancements to performance on complex queries, new NoSQL Key / Value API, cross-data center replication and ease-of-use. These enhancements are summarized in the Figure below, and detailed in the MySQL Cluster New Features whitepaper Figure 1: Next Generation Web Services, Cross Data Center Replication and Ease-of-Use Once of the key enhancements delivered in MySQL Cluster 7.2 is extensions made to the multi-threading processes of the data nodes. Multi-Threaded Data Node Extensions The MySQL Cluster 7.2 data node is now functionally divided into seven thread types: 1) Local Data Manager threads (ldm). Note – these are sometimes also called LQH threads. 2) Transaction Coordinator threads (tc) 3) Asynchronous Replication threads (rep) 4) Schema Management threads (main) 5) Network receiver threads (recv) 6) Network send threads (send) 7) IO threads Each of these thread types are discussed in more detail below. MySQL Cluster 7.2 increases the maximum number of LDM threads from 4 to 16. The LDM contains the actual data, which means that when using 16 threads the data is more heavily partitioned (this is automatic in MySQL Cluster). Each LDM thread maintains its own set of data partitions, index partitions and REDO log. The number of LDM partitions per data node is not dynamically configurable, but it is possible, however, to map more than one partition onto each LDM thread, providing flexibility in modifying the number of LDM threads. The TC domain stores the state of in-flight transactions. This means that every new transaction can easily be assigned to a new TC thread. Testing has shown that in most cases 1 TC thread per 2 LDM threads is sufficient, and in many cases even 1 TC thread per 4 LDM threads is also acceptable. Testing also demonstrated that in some instances where the workload needed to sustain very high update loads it is necessary to configure 3 to 4 TC threads per 4 LDM threads. In the previous MySQL Cluster 7.1 release, only one TC thread was available. This limit has been increased to 16 TC threads in MySQL Cluster 7.2. The TC domain also manages the Adaptive Query Localization functionality introduced in MySQL Cluster 7.2 that significantly enhanced complex query performance by pushing JOIN operations down to the data nodes. Asynchronous Replication was separated into its own thread with the release of MySQL Cluster 7.1, and has not been modified in the latest 7.2 release. To scale the number of TC threads, it was necessary to separate the Schema Management domain from the TC domain. The schema management thread has little load, so is implemented with a single thread. The Network receiver domain was bound to 1 thread in MySQL Cluster 7.1. With the increase of threads in MySQL Cluster 7.2 it is also necessary to increase the number of recv threads to 8. This enables each receive thread to service one or more sockets used to communicate with other nodes the Cluster. The Network send thread is a new thread type introduced in MySQL Cluster 7.2. Previously other threads handled the sending operations themselves, which can provide for lower latency. To achieve highest throughput however, it has been necessary to create dedicated send threads, of which 8 can be configured. It is still possible to configure MySQL Cluster 7.2 to a legacy mode that does not use any of the send threads – useful for those workloads that are most sensitive to latency. The IO Thread is the final thread type and there have been no changes to this domain in MySQL Cluster 7.2. Multiple IO threads were already available, which could be configured to either one thread per open file, or to a fixed number of IO threads that handle the IO traffic. Except when using compression on disk, the IO threads typically have a very light load. Benchmarking the Scalability Enhancements The scalability enhancements discussed above have made it possible to scale CPU usage of each data node to more than 5x of that possible in MySQL Cluster 7.1. In addition, a number of bottlenecks have been removed, making it possible to scale data node performance by even more than 5x. Figure 2: MySQL Cluster 7.2 Delivers 8.4x Higher Performance than 7.1 The flexAsynch benchmark was used to compare MySQL Cluster 7.2 performance to 7.1 across an 8-node Intel Xeon x5670-based cluster of dual socket commodity servers (6 cores each). As the results demonstrate, MySQL Cluster 7.2 delivers over 8x higher performance per data nodes than MySQL Cluster 7.1. More details of this and other benchmarks will be published in a new whitepaper – coming soon, so stay tuned! In a following blog post, I’ll provide recommendations on optimum thread configurations for different types of server processor. You can also learn more from the Best Practices Guide to Optimizing Performance of MySQL Cluster Conclusion MySQL Cluster has achieved a range of impressive benchmark results, and set in context with the previous 7.1 release, is able to deliver over 8x higher performance per node. As a result, the multi-threaded data node extensions not only serve to increase performance of MySQL Cluster, they also enable users to achieve significantly improved levels of utilization from current and future generations of massively multi-core, multi-thread processor designs.

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• alternative filesystems for SSD

  - by freedrull

  I am tired of watching fsck check my filesystem when my eeepc 901 shuts down abruptly due to a crash. I know that with a journaling filesystem, I won't have to wait for a check. However, I am well aware of the poor I/O performance of the SSD, so I can imagine using a journaling filesystem being even more frustrating, since there will be constant writes to the journal? I will buy a new laptop without such a crummy ssd someday but, is there anything I can do now, on the software side of things?

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• How to (hardware) RAID 10 on Ubuntu 10.04 LTS with 4 drives and motherboard with RAID contoller

  - by lollercoaster

  I have 4 500GB hard drives. I set up a RAID 10 in BIOS, much like shown here: http://www.supermicro.com/manuals/other/RAID_SATA_ESB2.pdf Then I followed these instructions: http://www.unrest.ca/Knowledge-Base/configuring-mdadm-raid10-for-ubuntu-910 Basically I cannot get it to work. I go through the instructions when I get to the "partition" section of the install, creating 4 RAID 1's (2 partitions on each drive, one for primary and one for swap space), then combining to make a RAID 10. Unfortunately it still shows 2 partitions, one 500 GB and another being 36GB for some reason. Any ideas? I think best would be if anyone had found good instructions (step by step) for how to do this...I've been googling for hours and haven't found anything...

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• Sendmail Sends but never Delivers

  - by Jeremy

  I have tried 10 different emails hosted at Google, Yahoo!, GoDaddy, and some that are privately hosted, and each time I get the following errors. I have blocked sensitive information, but you will be able to see the errors. Feb 16 17:06:50 xxxxx sendmail[31824]: o1GM6ovJ031824: [email protected], ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30054, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o1GM6oJo031825 Message accepted for delivery) Feb 16 16:54:19 xxxxx sendmail[31625]: o1GLsJPP031625: [email protected], ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30097, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o1GLsJah031626 Message accepted for delivery) Feb 17 09:05:52 xxxxx sm-mta[10620]: o1H6Z3jM005734: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=07:30:49, xdelay=01:15:36, mailer=esmtp, pri=571331, relay=aspmx3.googlemail.com. [209.85.222.4], dsn=4.0.0, stat=Deferred: Connection timed out with aspmx3.googlemail.com. Feb 17 10:35:23 xxxxx sm-mta[12828]: o1HEZwn8011833: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=00:59:25, xdelay=00:12:36, mailer=esmtp, pri=300353, relay=aln-mailrelay.att.net. [12.102.252.75], dsn=4.0.0, stat=Deferred: Connection timed out with aln-mailrelay.att.net. If you take a look, they all send, but then (HOURS later) I get an error "stat=Deferred: Connection timed out with {server}". I'm at my wits end, because I use this same setup on each of my servers, and they all work.

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• Virtual bridged networking with VLAN, could not ping

  - by v.yegy

  I require a virtual network with VLAN be build between two virtual hosts - which can be (lxc/ vbox -ubuntu or win xp). I tried with lxc and vbox with Ubuntu and was finding difficult to make it work without vlan, but was successful with vbox with xp. vbox-xp1 --- br1 ---------------- br2 ---- vbox-xp2 The config is: brctl addbr br1; brctl addbr br2 ifconfig br1 up; ifconfig br2 up stp br1 off; stp br2 off ip link add name br1-br2-l0 type veth peer name br1-br2-l1 sudo brctl addif br1 br1-br2-l0 sudo brctl addif br2 br1-br2-l1 vbox - xp 1 and 2 with network ; bridged and br1 and br2 respectively. The adapter is intel PRO/1000 MT Server and driver installed in guests. Configured IPs and two hosts pinged! VLAN config: ip link add link br1 name br1-2.5 type vlan id 5 brctl addif br2 br1-2.5 create vlan 5 in xp 1 and 2 and assign ip address Ping on with this config does not work. Wireshark trace on interface br1-br2-l1 / br1-2.5 shows that one ping results in ~240 ping packets and each growing by 4 bytes - first one being correct and 60, ping does not reach other host as I see mac is not learnt[arp -a]. -- if br1-2.5 is not configured, I see untagged packets in br1-br2-l1/0, but still not reaching other host as mac is not learnt. if br1-br2-l0/1 is made down, even if br1-2.5 is up, I count not see any packets. I tried with ebtables, but still could not make a correct config to work. -- If any one here are aware of any configuration, please let me know. I need to make a network of switches. Seems I have a very long way. Sorry for a very long question. Thanks and regards, vy

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• Why does terminal prompt text becomes black when connecting to Ubuntu with Nomachine NX client?

  - by David B

  I'm using Nomachine NX client for Windows to remotely connect to my Ubuntu. Every now and then I experience a strange phenomena: the text in the prompt of all open terminal windows becomes black, so it can't be viewed over the black background. Typed commands are also black, but the results are in normal colors. So I can run stuff, but can't see what I'm typing... After I close all open terminal windows and start a new terminal window, everything goes back to normal. This is rerally annoying and happens quite often. Any idea why?

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• KVM guest io is much slower than host io: is that normal?

  - by Evolver

  I have a Qemu-KVM host system setup on CentOS 6.3. Four 1TB SATA HDDs working in Software RAID10. Guest CentOS 6.3 is installed on separate LVM. People say that they see guest performance almost equal to host performance, but I don't see that. My i/o tests are showing 30-70% slower performance on guest than on host system. I tried to change scheduler (set elevator=deadline on host and elevator=noop on guest), set blkio.weight to 1000 in cgroup, change io to virtio... But none of these changes gave me any significant results. This is a guest .xml config part: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/dev/vgkvmnode/lv2'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> There are my tests: Host system: iozone test # iozone -a -i0 -i1 -i2 -s8G -r64k random random KB reclen write rewrite read reread read write 8388608 64 189930 197436 266786 267254 28644 66642 dd read test: one process and then four simultaneous processes # dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct 1073741824 bytes (1.1 GB) copied, 4.23044 s, 254 MB/s # dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=1024 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=2048 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=3072 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=4096 1073741824 bytes (1.1 GB) copied, 14.4528 s, 74.3 MB/s 1073741824 bytes (1.1 GB) copied, 14.562 s, 73.7 MB/s 1073741824 bytes (1.1 GB) copied, 14.6341 s, 73.4 MB/s 1073741824 bytes (1.1 GB) copied, 14.7006 s, 73.0 MB/s dd write test: one process and then four simultaneous processes # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 6.2039 s, 173 MB/s # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test2 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test3 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test4 bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 32.7173 s, 32.8 MB/s 1073741824 bytes (1.1 GB) copied, 32.8868 s, 32.6 MB/s 1073741824 bytes (1.1 GB) copied, 32.9097 s, 32.6 MB/s 1073741824 bytes (1.1 GB) copied, 32.9688 s, 32.6 MB/s Guest system: iozone test # iozone -a -i0 -i1 -i2 -s512M -r64k random random KB reclen write rewrite read reread read write 524288 64 93374 154596 141193 149865 21394 46264 dd read test: one process and then four simultaneous processes # dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=1024 1073741824 bytes (1.1 GB) copied, 5.04356 s, 213 MB/s # dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=1024 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=2048 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=3072 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=4096 1073741824 bytes (1.1 GB) copied, 24.7348 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.7378 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.7408 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.744 s, 43.4 MB/s dd write test: one process and then four simultaneous processes # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 10.415 s, 103 MB/s # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test2 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test3 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test4 bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 49.8874 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.8608 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.8693 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.9427 s, 21.5 MB/s I wonder is that normal situation or did I missed something?

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• Great GUI for Apache2?

  - by ajsie

  I wonder if there are great GUI management tools for Apache so you dont have to manually edit files in VIM. It would be great if you could manage Apache over internet. Any suggestions of such tools?

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• How can I get the root account to generate an acceptable ssh key?

  - by Jamie

  On an ubuntu machine I did the following: ~$ sudo su - [sudo] password for jamie: root@mydomain:~# ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: 12:34:56:78:9a:bc:de:f0:12:34:56:78:9a:bc:de:f0 [email protected] The key's randomart image is: +--[ RSA 2048]----+ | | | | | | | | | | | | | | | | | | +-----------------+ root@mydomain:~# cat /root/.ssh/id_rsa.pub | ssh -p 443 [email protected] 'cat > authorized_keys' [email protected]'s password: root@mydomain:~# ssh -p 443 [email protected] [email protected]'s password: It's asking me for a password. However, using a regular account, the following works: $ cd ; ssh-keygen -t rsa ; cat ~/.ssh/id_rsa.pub | ssh [email protected] 'cat >> ~/.ssh/authorized_keys' $ ssh [email protected] Last login: Thu Oct 24 14:48:41 2013 from 173.45.232.105 [[email protected] ~]$ Which leads me to believe it's not an issue of authorized_keys versus authorized_keys2 or permissions. Why does the 'root' account accessing the remote 'jamie' account not work? The remote machine is CentOS if that's relevant.

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• Slapd service won't start, unable to open pid file

  - by Foezjie

  I'm trying to set up a test LDAP-server for some developers but I'm running into some trouble. service slapd start errors so I run /usr/sbin/slapd -d 1 and this gives me the following error at the end: unable to open pid file "/var/run/ldap/slapd.pid": 13 (Permission denied) slapd destroy: freeing system resources. slapd stopped. The rights for /var/run/ldap are as follows: root@pec:/var/run/ldap# ls -ld drwxr-xr-x 2 openldap openldap 60 2012-07-04 20:45 So I don't get why there is still a permission denied. Syslog gives the following when running slapd: Jul 4 21:00:27 pec slapd[13758]: @(#) $OpenLDAP: slapd 2.4.21 (Dec 19 2011 15:40:04) $#012#011buildd@allspice:/build/buildd/openldap-2.4.21/debian/build/servers/slapd Jul 4 21:00:27 pec kernel: [8147247.203100] type=1503 audit(1341428427.953:64): operation="truncate" pid=13758 parent=20433 profile="/usr/sbin/slapd" requested_mask="::w" denied_mask="::w" fsuid=0 ouid=119 name="/var/run/ldap/slapd.pid" Can anyone point me in the right direction?

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• ltsp-built-client error

  - by sat

  I am facing some issues while building a thin client using the ltsp-build-client, it says an error. Error is: I: Retrieving Release E: Failed getting release file file://root/ISO/ubuntu-12.04.1-desktop-i386.iso/dists/squeeze/Release error: LTSP client installation ended abnormally My Command is: ltsp-build-client --mirror file://root/ISO/ubuntu-12.04.1-desktop-i386.iso --security-mirror none --accept-unsigned-packages I am referring this URL http://wiki.debian.org/LTSP/Howto. How to solve this error?

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• Best MTA setup for home or laptop computers - not server

  - by thomasrutter

  Hello, What is a good MTA (e.g. Postfix or something else) setup for a home computer behind a NAT, or a laptop that connects to various different wifi networks? I've read a lot of Postfix tutorials on how to set it up this way or that, but they are usually geared towards computers that are servers ie they have a static IP have a domain name are always connected to the same network My requirements are, I guess: Ability to forward mail for "root" to another server of my choosing. No listening for incoming SMTP connections - outgoing only Ability to route outgoing mail via an external SMTP server with authentication (and perhaps encryption) If not Postfix, I need an MTA which can queue up mails in case it temporarily has no internet connection.

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• What is the simplest way to build your own .deb package?

  - by Calvin Fisher

  Having used Ubuntu for several years now, I've assembled a short list of scripts and packages that I always install on my computers. I would like to pack them up into a .deb to make it easier to get set up on a fresh OS installation. I'm imagining, for instance, one package that would install all of my custom BASH scripts that I've made for common tasks, and another one that would depend on other packages (like w64codecs) that I always install but forget that I need to until I go to do something and it's not there. It doesn't even have to be by-the-book; I'm not looking to deploy these publicly. I'm just looking to roll up all these tasks into one sudo dpkg --install. To quantify "simple" or "easy," I mean to say that I'm looking for the method with the fewest steps requiring the least technical knowledge and, most importantly, taking the least time.

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• standart packages list

  - by Valintinr

  Im learning puppet system and now need to do next task. So we have few servers with same OS (Altlinux p6,t6) - puppet-agents and have puppet-master. On agents installed some packages, eg. 200 packages on first, 300 on second .... But necessary only 180 installed. We know names of necessary packages but dont know names of other (unnecessary packages) So task: Have i can check or install (if not installed yet) necessary packages and delete other packages (we dont know names of other installed packages) Help please WBR Valentin

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• Is Gentoo worth the compile?

  - by erickreutz

  I'm working on getting my first server up and running and my dad is trying to convince me that Gentoo is the way to go. Is it worth the compile? I was just planning on using Ubuntu.

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• How to change MySQL data directory?

  - by Jonathan Frank

  I want to place my databases in another directory, so I can store them in an ESB (elastic block storage, just a fancy name for a virtualized harddisk) together with my web-apps and other persistent data. I have tried to walk through a tutorial at http://crashmag.net/change-the-default-mysql-data-directory-with-selinux-enabled. Everything seems fine until I type this command: # semanage fcontext -a -t mysqld_db_t "/srv/mysql(/.*)?" Then the command fails and tells me that mysqld_db_t is an invalid SELinux context even if the default MySQL data directory is labelled with this context. I am running Fedora 15 on Virtualbox (behaves like an ordinary x86-compatible box) and Amazon EC2 (based on Xen) so the tutorial should be compatible. It is also worth to mention that turning off SELinux globally or just for the MySQL process is not an option, because such a solution will decrease the security of the system if a hacker gains access to the system via the MySQL server. I have never seen this problem before I changed to the Redhat/Fedora architecture, so it could be a distribution specific issue. Any help is highly appreciated

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• List full timestamps of files in a tarball

  - by Mechanical snail

  I have a large tar archive and want to see the exact (nanosecond) timestamps that are stored for each file in the archive. In case it's relevant, the tarball is in POSIX-2001 format (tar --format=posix). tar --list --verbose displays the timestamps rounded off to the minute. For comparison, ls --full-time does what I want, but I'd rather not have to extract everything first because it's huge. For my purposes, command-line and GUI tools are both fine.

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• o2cb thinks ocfs2 cluster is still online, and refuses to shut down

  - by Kendall

  I have a handful of OpenSuSE 11.2 servers that utilize OCFS2 volumes. I've noticed that o2cb can't figure out when the OCFS2 cluster is actually mounted. For example, when I try to shutdown o2cb, after stopping OCSF2, o2cb refuses to shutdown because it thinks OCFS2 is still up! After stopping OCFS2 I try to stop o2cb... hamguy:/dev/disk/by-label # /etc/init.d/o2cb stop Stopping O2CB cluster ocfs2: Failed Unable to stop cluster as heartbeat region still active So I check the status... hamguy:/dev/disk/by-label # /etc/init.d/o2cb status Driver for "configfs": Loaded Filesystem "configfs": Mounted Stack glue driver: Loaded Stack plugin "o2cb": Loaded Driver for "ocfs2_dlmfs": Loaded Filesystem "ocfs2_dlmfs": Mounted Checking O2CB cluster ocfs2: Online Heartbeat dead threshold = 31 Network idle timeout: 30000 Network keepalive delay: 2000 Network reconnect delay: 2000 Checking O2CB heartbeat: Active And double check OCFS2... hamguy:/dev/disk/by-label # /etc/init.d/ocfs2 status Configured OCFS2 mountpoints: /u/conf /u/logs /u/backup /u/client /u/data /u/mdata OCFS2 is clearly down, while o2cb clearly thinks otherwise. The versions of OCFS2 and o2cb are... kendall@hamguy:~> rpm -qa |grep ocfs2 ocfs2console-1.4.1-25.6.x86_64 ocfs2-tools-o2cb-1.4.1-25.6.x86_64 ocfs2-tools-1.4.1-25.6.x86_64 kendall@hamguy:~> rpm -qa |grep o2cb ocfs2-tools-o2cb-1.4.1-25.6.x86_64 What causes this, and is there a way around it? If I try to reboot the machine, it will just sit there forever until your physically power cycle it. That obviously is a bit of a problem. Any insight is appreciated, thank you. Kendall

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• Formatting the BASH command prompt

  - by Robert S. Barnes

  I would like to change the formatting on my BASH prompt from this: [email protected]:~/some/very/annoying/long/path$ to something like this: [email protected]:~/some/very/annoying/long/path $ The idea is that I would be able to type a reasonably long command on one line without it wrapping to the next line so quickly.

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• slow pppoe connection using Ubuntu 9.10

  - by Radu

  I have a Compaq Presario CQ61, instaled Ubuntu 9.10 and Windows 7 on it. It works great except the PPPoE connection in Ubuntu, when i dial in Windows my download speed reach up to 91 Mb, rebooted in Ubuntu, downloaded same file from the same server with a speed of maximum 3 Mb, cheked in Windows again 80 - 90 Mb constant. I can't figure what slow's the internet connection in Ubuntu. Anyone has an ideea on this problem ? (NO iptables configured, NO HTB, CBQ ...etc configured) . Thank you

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