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  • How to force mdadm to stop RAID5 array?

    - by lucek
    I have /dev/md127 RAID5 array that consisted of four drives. I managed to hot remove them from the array and currently /dev/md127 does not have any drives: cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdd1[0] sda1[1] 304052032 blocks super 1.2 [2/2] [UU] md1 : active raid0 sda5[1] sdd5[0] 16770048 blocks super 1.2 512k chunks md127 : active raid5 super 1.2 level 5, 512k chunk, algorithm 2 [4/0] [____] unused devices: <none> and mdadm --detail /dev/md127 /dev/md127: Version : 1.2 Creation Time : Thu Sep 6 10:39:57 2012 Raid Level : raid5 Array Size : 8790402048 (8383.18 GiB 9001.37 GB) Used Dev Size : 2930134016 (2794.39 GiB 3000.46 GB) Raid Devices : 4 Total Devices : 0 Persistence : Superblock is persistent Update Time : Fri Sep 7 17:19:47 2012 State : clean, FAILED Active Devices : 0 Working Devices : 0 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Number Major Minor RaidDevice State 0 0 0 0 removed 1 0 0 1 removed 2 0 0 2 removed 3 0 0 3 removed I've tried to do mdadm --stop /dev/md127 but: mdadm --stop /dev/md127 mdadm: Cannot get exclusive access to /dev/md127:Perhaps a running process, mounted filesystem or active volume group? I made sure that it's unmounted, umount -l /dev/md127 and confirmed that it indeed is unmounted: umount /dev/md127 umount: /dev/md127: not mounted I've tried to zero superblock of each drive and I get (for each drive): mdadm --zero-superblock /dev/sde1 mdadm: Unrecognised md component device - /dev/sde1 Here's output of lsof|grep md127: lsof|grep md127 md127_rai 276 root cwd DIR 9,0 4096 2 / md127_rai 276 root rtd DIR 9,0 4096 2 / md127_rai 276 root txt unknown /proc/276/exe What else can I do? LVM is not even installed so it can't be a factor.

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  • Encrypt EC2 API call

    - by Frank
    I have to host an AMI in the Amazon Marketplace. i need to get the type of instance, whenever some user launches the AMI., like if its small medium or large. based on that i need to make some changes in the AMI when its created. I can do this with Amazon API call, to get the instance type, but the problem is that the instances created with the AMI will be started by other users, and i cannot use my AWS Credentials in the Amazon API. Is there any way that i can create an anonymous readonly user to make only specific type of EC2 API Calls? Or can i encrypt my EC2 API credentials, so no one can use it?

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  • Recommending simple appliance for DansGuardian, iptables, snort inline

    - by SRobertJames
    I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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  • How can I download a package and all of its dependencies with apt-get

    - by Velislav Marinov
    I'm using Ubuntu 12.04 and I would like to use apt-get to download a package and all of it's depenedcies. Those packages will have to be installed on computers with no internet connection, so in addition to the base package I also need to all of the package's dependcies as well. Is there an easy way to do this (like in muon package manager)? I now that I can use the apt-get download command for this, but I don't want to manually specify each package that muon recommends to install or upgrade.

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  • Conditionnal relay in postfix

    - by Florent
    I use postfix to send direct email. But, I use a relay to send email for specific senders. So I use "sender_dependent_relayhost_maps" : /etc/postfix/main.cf : relayhost = transport_maps = hash:/etc/postfix/transport smtp_sender_dependent_authentication = yes sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay /etc/postfix/sender_relay : [email protected] smtp.relay.com So when I send an email with sender email "[email protected]", postfix will use the relay. But... I don't want to use the relay host for some recipient. ;) I think I must use "transport_map" to catch the email before it pass through "sender_dependent_relayhost_maps" but I don't know how to do it... Thanks

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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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  • What can cause peaks in pagetables in /proc/meminfo ?

    - by Fuzzy76
    I have a gameserver running Debian Lenny on a VPS host. Even when experiencing a fairly low load, the players start experiencing major lag (ping times rise from 50 ms to 150-500 ms) in bursts of 3 - 10 seconds. I have installed Munin server monitoring, but when looking at the graphs it looks like the server has plenty of CPU, RAM and bandwidth available. The only weird thing I noticed is some peaks in the memory graph attributed to "page_tables" which maps to PageTables in /proc/meminfo but I can't find any good information on what this might mean. Any ideas what might be causing this? If you need any more graps, just let me know. The interrupts/second count is at roughly 400-600 during this period (nearly all from eth0). The drop in committed was caused by me trying to lower the allocated memory for the server from 512MB to 256MB, but that didn't seem to help.

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  • Appropriate Network switch for small server cluster

    - by Chris Dutrow
    Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should be able to communicate very fast with each other, especially the Redis server. This will probably require the use of internal IP addresses. We will need to use multi-data center replication to synchronize the Cassandra cluster with the one that we currently have hosted on the cloud Was looking into network switches and we are unsure of the appropriate specifications that we should be looking for. Does the switch need to be "managed" or can it be "unmanged"? Does the switch need to support IPv6 or just IPv4? Do we need an enterprise level Cisco switch, or can we go with something like a $200 DLink managed (or unmanaged) small business switch? Thanks so much!

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  • Configure bash_profile for one single terminal emulator

    - by Hugo
    I'm using a new terminal emulator. Terminology is the E17 default terminal, and it have a great command, $ tyls with is a "graphical" $ ls I want to create an alias just for this terminal, because the command "tyls" don't make sense to konsole, rxvt or other terminals. I'm thinking in some kind of "if" in ~/.bash_profile to test if I'm on terminology and then run the following command: alias ls="tyls" But how can I test if I'm in terminology but not xterm? Can someone help me? Thanks!

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  • Mail server Backup script

    - by Paul Stevens
    Hello, Im looking for the best way to accomplish a full backup of our "vmail" accounts on our mail server (CentOS "iRedMail" 5.1). I also need to split on 4GB parts the resulting tar or bzip compressed backup, and get this DVD-RW burned, on same server. The idea is to get this procedure to running overnight, once a week. Our mail server holds about 45GB of information. I will appreciate any advise or help on this topic. Thanks.

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  • Where is the xorg.conf file in Karmic Koala (Ubuntu 9.10) ?

    - by jfmessier
    I am trying to change this xorg.conf file that I used to modify under Ubuntu 9.04, so it can have the higher resolutions of my monitor. Under 9.04, the monitor was unknown, and I had to key in all resolutions in the file, and although it is found under 9.10, 9.10 does not have the highest resolution that My monitor can sustain. How can I change such setting ? Is xorg.conf moved, or replaced ? Merci :-) JF

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  • Color Schemes don't look right in CLI vim

    - by person
    I was having a bit of trouble reading the dark red strings of Vim's default color scheme, so I decided to switch to a different one. http://code.google.com/p/vimcolorsch...kboard.vim?r=2 http://files.werx.dk/wombat.vim However, when I set my color schemes to these, not only do they not come out correctly (for example, comments are bright blue), but these 2 somehow come out looking exactly the same! Am I doing something wrong, or are these colors restricted in the terminal so default colors are being chosen?

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  • Want to add a new domain to my postfix, but mails not delivered (mail look back to myself)

    - by user74850
    Hi everybody, My host relay is working but I was aksed to add a new domain (like external.example.com). I have added in main.cf the new fqdn in relay_domains relay_domains = $mydestination, example.com,example2.com, externe.example.com and in transport example.com smtp:[192.168.1.22] example2.com smtp:[192.168.1.22] external.example.com smtp:[192.168.1.22] Mails sent to users with example.com and example2.com domain are well delivered. But for mails to external.example.com i got this message Mar 17 16:47:52 relayhost postfix/smtp[11948]: 754E1876A01: to=<[email protected]>, relay=relayhost2.example.com[80.81.82.83]:25, delay=19555, delays=19525/0.01/30/0, dsn=4.4.6, status=deferred (mail for external.example.com loops back to myself) I read another Q/A about the same issue right here, but it's not helping me. Can you ?

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  • iptables -- OK, **now** am I doing it right?

    - by Agvorth
    This is a follow up to a previous question where I asked whether my iptables config is correct. CentOS 5.3 system. Intended result: block everything except ping, ssh, Apache, and SSL. Based on xenoterracide's advice and the other responses to the question (thanks guys), I created this script: # Establish a clean slate iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -F # Flush all rules iptables -X # Delete all chains # Disable routing. Drop packets if they reach the end of the chain. iptables -P FORWARD DROP # Drop all packets with a bad state iptables -A INPUT -m state --state INVALID -j DROP # Accept any packets that have something to do with ones we've sent on outbound iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # Accept any packets coming or going on localhost (this can be very important) iptables -A INPUT -i lo -j ACCEPT # Accept ICMP iptables -A INPUT -p icmp -j ACCEPT # Allow ssh iptables -A INPUT -p tcp --dport 22 -j ACCEPT # Allow httpd iptables -A INPUT -p tcp --dport 80 -j ACCEPT # Allow SSL iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Block all other traffic iptables -A INPUT -j DROP Now when I list the rules I get... # iptables -L -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- any any anywhere anywhere state INVALID 9 612 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT all -- lo any anywhere anywhere 0 0 ACCEPT icmp -- any any anywhere anywhere 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:ssh 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:https 0 0 DROP all -- any any anywhere anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 5 packets, 644 bytes) pkts bytes target prot opt in out source destination I ran it and I can still log in, so that's good. Anyone notice anything major out of wack?

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  • mount fstab partition with public access

    - by Mikhail
    How do I specify that an fstab mount-point should be public? I want /mnt/windows to be accessible to normal users. I believe I am using ntfs-3g. If I set the /mnt/windows to 777 will it be publicly accessible without changing the permissions on the NTFS disk? /dev/sdb4 /mnt/windows ntfs noatime 0 1 /dev/sdb5 / ext4 noatime 0 1 UUID=5AA4-168D /boot/efi vfat defaults 0 1 and localhost my_computer # stat /mnt/windows/ File: '/mnt/windows/' Size: 12288 Blocks: 24 IO Block: 512 directory Device: 814h/2068d Inode: 5 Links: 1 Access: (0700/drwx------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-08-21 18:29:13.597722200 -0500 Modify: 2014-08-21 18:29:13.597722200 -0500 Change: 2014-08-21 18:29:13.597722200 -0500 Birth: -

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  • Gentoo on Mac Mini - can't get framebuffer to work

    - by user42055
    I have the latest Gentoo on an intel mac mini with 945G graphics. I'm trying to start X (with no config) but it complains that /dev/fb0 doesn't exist. I've tried adding the following options to the kernel boot params: video=intelfb:mode=800x600-32@60,accel,hwcursor vga=761 Because I read that the fb might not be enabled unless you set a vga= option. Unfortunately the kernel doesn't recognise that option. If I changed it to vga=ask it presents me a list of about 6 text modes no greater than 80x60. In the kernel I have agpgart, drm (using i830 module) and vga text console compiled in. What am I not doing right ?

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  • Gentoo on Mac Mini - can't get framebuffer to work

    - by user42055
    I have the last Gentoo on an intel mac mini with 945G graphics. I'm trying to start X (with no config) but it complains that /dev/fb0 doesn't exist. I've tried adding the following options to the kernel boot params: video=intelfb:mode=800x600-32@60,accel,hwcursor vga=761 Because I read that the fb might not be enabled unless you set a vga= option. Unfortunately the kernel doesn't recognise that option. If I changed it to vga=ask it presents me a list of about 6 text modes no greater than 80x60. In the kernel I have agpgart, drm (using i830 module) and vga text console compiled in. What am I not doing right ?

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  • Openbox fails on login

    - by Sam
    X throws this error: Xsession: unable to launch "/usr/share/xsessions/openbox.xsession" Xsession --- "/usr/share/xsessions/openbox.xsession" not found; Falling back to default session. But a trip to the Command line reveals: sam@Aristotle:/usr/share/xsessions$ ls ... -rw-r--r-- 1 root root 164 2011-05-22 12:27 openbox.xsession ... I am using Ubuntu 12.04, openbox 3.5.0, and X.Org X Server 1.10.4

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  • Choose between multiple keyboard layouts for different users in GDM3

    - by Daniel Wagner
    I am trying to set up a computer with multiple users each with different preferred keyboard layouts. The biggest sticking point right now is allowing each to log in comfortably. GDM used to offer a way to choose keyboard layout, but I can't discover how to set this up in GDM3. All the solutions I found when Googling this problem suggest changing the keyboard layout in xorg.conf, but that only sets a different single layout and still does not seem to allow me to change the layout between multiple choices. How can I allow multiple layouts when logging in?

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  • iptables ACCEPT policy

    - by kamae
    In Redhat EL 6, iptables INPUT policy is ACCEPT but INPUT chain has REJECT entry in the end. /etc/syconfig/iptables is as below: *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT Do you know why the policy is ACCEPT not DROP? I think setting DROP policy is safer than ACCEPT in case to make mistake in the chain. Actually the policy is not applied to any packet: # iptables -L -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

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