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• What's going on with my server? High load, lots of idle CPU time, low disk utilization

  - by Jonathan

  I run a web site and send a legitimate opt-in, daily email newsletter to subscribers. Both the web hosting and email sending are done by the same machine. I have about 100,000 subscribers who have opted in to my daily email newsletter. My PHP script did a pretty good job sending mail to all of them until fairly recently, but as the list has grown I can't keep up. When I run top, I have very high load--usually at least 6 or 7, sometimes as high as 15--even though I only have two CPUs. However, when I run sar, my CPU is idle an average of about 30% of the time. So, it seems I'm not CPU bound. When I run iostat, it seems as though I'm not disk bound because my %util for each device is very low (no more than 5%). Given that I don't seem to be CPU bound or disk bound, why is top reporting such high load? Additionally, since I don't seem to be CPU bound or disk bound, why is my email sending script not able to keep up? Here's what I see when running top: top - 11:33:28 up 74 days, 18:49, 2 users, load average: 7.65, 8.79, 8.28 Tasks: 168 total, 5 running, 162 sleeping, 0 stopped, 1 zombie Cpu(s): 38.9%us, 58.6%sy, 0.8%ni, 0.0%id, 0.7%wa, 0.2%hi, 0.8%si, 0.0%st Mem: 3083012k total, 2144436k used, 938576k free, 281136k buffers Swap: 2048248k total, 39164k used, 2009084k free, 1470412k cached Here's what I see when running iostat -mx: avg-cpu: %user %nice %system %iowait %steal %idle 34.80 1.20 55.24 0.37 0.00 8.38 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util sda 0.19 71.70 1.59 29.45 0.02 0.07 5.90 0.55 17.82 1.16 3.59 sda1 0.00 0.00 0.00 0.00 0.00 0.00 7.10 0.00 13.80 13.72 0.00 sda2 0.05 50.45 1.13 24.57 0.01 0.29 24.25 0.35 13.43 1.15 2.97 sda3 0.05 10.17 0.20 2.33 0.01 0.05 43.75 0.05 20.96 2.45 0.62 sda4 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 70.50 70.50 0.00 sda5 0.07 0.22 0.03 0.07 0.00 0.00 32.84 0.08 856.19 8.03 0.08 sda6 0.02 5.45 0.03 0.72 0.00 0.02 67.55 0.02 26.72 5.26 0.39 sda7 0.00 1.56 0.00 0.42 0.00 0.01 38.04 0.00 8.88 5.84 0.24 sda8 0.01 3.84 0.20 1.35 0.00 0.02 28.55 0.05 31.90 4.08 0.63 Here's what I see when running sar: 09:40:02 AM CPU %user %nice %system %iowait %steal %idle 09:50:01 AM all 30.59 1.01 49.80 0.23 0.00 18.37 10:00:08 AM all 31.73 0.92 51.66 0.13 0.00 15.55 10:10:06 AM all 30.43 0.99 48.94 0.26 0.00 19.38 10:20:01 AM all 29.58 1.00 47.76 0.25 0.00 21.42 10:30:01 AM all 29.37 1.02 47.30 0.18 0.00 22.13 10:40:06 AM all 32.50 1.01 52.94 0.16 0.00 13.39 10:50:01 AM all 30.49 1.00 49.59 0.15 0.00 18.77 11:00:01 AM all 29.43 0.99 47.71 0.17 0.00 21.71 11:10:07 AM all 30.26 0.93 49.48 0.83 0.00 18.50 11:20:02 AM all 29.83 0.81 48.51 1.32 0.00 19.52 11:30:06 AM all 31.18 0.88 51.33 1.15 0.00 15.47 Average: all 26.21 1.15 42.62 0.48 0.00 29.54 Here are the top handful of processes listed at the particular time I happened to run top -c: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 8180 mysql 16 0 57448 19m 2948 S 26.6 0.7 4702:26 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/bristno.pid --skip-external-locking 26956 brristno 17 0 0 0 0 Z 8.0 0.0 0:00.24 [php] <defunct> 26958 brristno 17 0 94408 43m 37m R 5.0 1.4 0:00.15 /usr/bin/php /home/brristno/public_html/dbv.php 22852 nobody 16 0 9628 2900 1524 S 0.7 0.1 0:00.17 /usr/local/apache/bin/httpd -k start -DSSL 8591 brristno 34 19 96896 13m 6652 S 0.3 0.4 0:29.82 /usr/local/bin/php /home/brristno/bin/mailer.php 1qwqyb6 i0gbor 24469 nobody 16 0 9628 2880 1508 S 0.3 0.1 0:00.08 /usr/local/apache/bin/httpd -k start -DSSL 25495 nobody 15 0 9628 2876 1500 S 0.3 0.1 0:00.06 /usr/local/apache/bin/httpd -k start -DSSL 26149 nobody 15 0 9628 2864 1504 S 0.3 0.1 0:00.04 /usr/local/apache/bin/httpd -k start -DSSL

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• (Preferably) Encrypted Server Backups

  - by Shoaibi

  I have somehow managed to purchase a VPS after collecting money for sometime, now problem is i cant find a way to backup the server. My previous approach was: Got a webdav account from mydisk.se, mounted it on the vps, used duplicity and created encrypted backups. Problem is it was only 2G, and its running out of space, at my own place i dont have a stable internet connection else i have a 500G drive that i could surely use for backups. The vps has a 12G HD, and i would like to backup /home, /root, /etc, /var/ (specially log and www). Any ideas are welcomed. [EDIT] I am more of looking for resource of setting up a backup-point or such(i know how to setup a backup server, but i cant as i dont have stable connection or the money to buy another VPS/disk for backup) , i have already got the tools needed.

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• Can not copy files after installing windows

  - by Ali

  I am experiencing a weird problem. I was running Xubuntu on my laptop until yesterday that I had to delete Xubuntu and install Windows. I had a NTFS partition on my Xubuntu that I kept some files on it. Today after installing windows I wanted to move all the files from that partition to an external HDD. I selected all files and folders and clicked on Copy, then I went to the HDD and clicked on paste but nothing happened. I can not do that. I do not know why. I copy the files, and wherever I click paste, nothing happens. If I try to copy the files and folders one by one, I can copy some of them, but some of them do not move. The other problem I have is that I can not open some files, in particular pdf files. When I click on pdf files I get this error: There was an error opening this document. This file cannot be found. Also, I cannot play some mp4 files. I can not open some jpg and txt files. I get this error The directory name is invalid. So in summary, after removing Xubuntu and installing windows 7 I have the following problems with one of the NTFS partitions on my internal drive: Can not copy or cut all folders and files from that partition to any other partition - I also do not get any errors. Can copy some folders and files Can not access some pdf, jpeg, txt and mp4 files and get the above errors. I should also mention I did not change anything for this partition during the installation or formatting the other partitions.

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• Using nawk, how to print the first names for all those in the 916 area code? [closed]

  - by Steve

  Possible Duplicate: Using nawk, how to print all first names containing four characters? Using nawk, how to print the first names for all those in the 916 area code? I've tried nawk ‘$3 ~ /(916)/{print $1}’ inputfile but didn' work. Jody Savage:(206) 548-1278:15:188:150 Guy Quigley:(916) 343-6410:250:100:175 Dan Savage:(406) 298-7744:450:300:275 Nancy McNeil:(206) 548-1278:250:80:75 John Goldenrod:(916) 348-4278:250:100:175 Chet Main:(510) 548-5258:50:95:135

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• Too many Bind query (cache) denied, DNS attack?

  - by Jake

  Once Bind crashed and I did: tail -f /var/log/messages I see a massive number of logs every second. Is this a DNS attack? or is there something wrong? Sometimes I see a domain in logs like this: dOmAin.com (upper and lower). As you see there is only one single domain in the logs with different IPs Oct 10 02:21:26 mail named[20831]: client 74.125.189.18#38921: query (cache) 'ns1.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.144.171#38833: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.17#42428: query (cache) 'ns2.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.27#37899: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 193.203.82.66#39263: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.170#59723: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 80.169.197.66#32903: query (cache) 'dOmAin.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 134.58.60.1#47558: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.34#47387: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.8#59392: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.19#64395: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 217.72.163.3#42190: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 83.146.21.252#22020: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.116#57342: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 193.203.82.66#52020: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.72#64317: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 80.169.197.66#31989: query (cache) 'dOmAin.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.18#47436: query (cache) 'ns2.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.16#44005: query (cache) 'ns1.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 85.132.31.10#50379: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 94.241.128.3#60106: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 85.132.31.10#59118: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 212.95.135.78#27811: query (cache) 'domain.com/A/IN' denied /etc/resolv.conf ; generated by /sbin/dhclient-script nameserver 4.2.2.4 nameserver 8.8.4.4 Bind config: // generated by named-bootconf.pl options { directory "/var/named"; /* * If there is a firewall between you and nameservers you want * to talk to, you might need to uncomment the query-source * directive below. Previous versions of BIND always asked * questions using port 53, but BIND 8.1 uses an unprivileged * port by default. */ // query-source address * port 53; allow-transfer { none; }; allow-recursion { localnets; }; //listen-on-v6 { any; }; notify no; }; // // a caching only nameserver config // controls { inet 127.0.0.1 allow { localhost; } keys { rndckey; }; }; zone "." IN { type hint; file "named.ca"; }; zone "localhost" IN { type master; file "localhost.zone"; allow-update { none; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "named.local"; allow-update { none; }; };

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• Samba server with Virtual Box Guest

  - by Anwar Shah

  I want to setup a samba server on My Ubuntu host for My Windows Guest in Virtual Box. I am using Ubuntu 12.04 and Windows version is Windows XP. VirtualBox 4.1.0.0 The Question is : How can I achieve this or Is it possible? Note: I am not trying to use the shared folder feature of Virtual Box. I used that feature already. Please Remember that I have only a physical machine. The other one is virtual.

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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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• Cron ignoring an update to crontab

  - by GJ

  I've commented out a line in the crontab on a debian server, which I guess was there by default yet was causing me to get error emails every hour: # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly However, the error emails keep coming in as if it hasn't been commented out. The error emails: Subject: Cron <root@(none)> root cd / && run-parts --report /etc/cron.hourly (failed) /bin/sh: root: not found Any ideas?

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• How to share drive space from vmware server 2 host to a guest?

  - by matnagel

  In the vmware tools in the guest there is an option to access shares from the host. What is the way to create such shares on a vmware 2 host? I did not find where in infrastructure web access. I also went through the vmware server 2 user's guide but did not see it mentioned. Can you help? This is an ubuntu 64 bit server 8.04 LTS host.

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• Installing qt headers and libraries

  - by ant2009

  Hello, Ubuntu 9.10 2.6.31-20-generic I am trying to install some software. When I do the ./configure. I get the following error: checking for Qt... configure: error: Qt (>= Qt 3.0.2) (headers and libraries) not found. Please check your installation! So I install the following package thinking this would solve the problem. sudo apt-get install libqt4-dev I was thinking that the libqt4-dev would install the headers and libraries. However, I am still getting the same problem. Any ideas? Many thanks,

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• Test script if host is back online

  - by brubelsabs

  E.g. system: Ubuntu/Debian. As many of you do this probably via ping and a terminal, I always forget this terminal when switching to other task... So a noftification popup would be useful. So can I do better as this?: while; do if ping -c 1 your.host.com; expr $? = 0; then notify-send "your.host.com back online"; sleep 30s; else sleep 30s; fi; done You will need zsh and libnotify to let the snippet work. As script: #!/usr/bin/env zsh while; do if ping -c 1 $1; expr $? = 0; then notify-send "$1 back online"; sleep 30s; else sleep 30s; fi; done

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• how're routing tables populated?

  - by Robbie Mckennie

  i've been reading "tcp/ip illustrated" and i started reading about ip forwarding. all about how you can receive a datagram and work out where to send it next based on the desination ip and your routing table. but what confused me is how (in a home network setting) the table itself is populated. is there a lower layer protocol at work here? does it come along with dhcp? or is it simply based on the ip address and netmask of each interface? i do know (from other books) that in the early days of ethernet one had to set up routing tables by hand, but i know i didn't do that.

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• Reconstructing the disk order in RAID 6 with 7 disks

  - by rkotulla

  a little background to this question first: I am running a RAID-6 within a QNAP TS869L external RAID/NAS system. I started with 5 disks of 3 TB each back in the day, and later added another 2 disks of 3TB to the RAID. The QNAP internals handled the growing and re-syncing etc, and everything seemd to be perfectly fine. About 2 weeks ago, I had one of the disks (disk #5, disk #2 has gone bad in the mean time) fail, and somehow (I have no idea why), also disks 1 and 2 got kicked out of the array. I replaced disk #5, but the RAID didn't start working again. After some calls to QNAP technical support, they re-created the array (using mdadm --create --force --assume-clean ...), but the resulting array couldn't find a filesystem, and I was kindly referred to contact a data recovery company that I can't afford. After some digging through old log files, resetting the disk to factory default, etc, I found a few errors that were made during this re-create - I wish I still had some of the original metadata, but unfortunately i don't (I definitely learned that lesson). I'm currently at the point where I know the correct chunk-size (64K), metadata-version (1.0; factory default was 0.9, but from what I read 0.9 doesn't handle disks over 2 TB, mine are 3 TB), and I now find the ext4 filesystem that should be on the disks. Only variable left to determine is the right disk order! I started using the description found in answer #4 of "Recover RAID 5 data after created new array instead of re-using" but am a little confused on what the order should be for a proper RAID-6. RAID-5 is pretty well documented in a number of places, but RAID-6 much less so. Also, does the layout, i.e. distribution of parity and data chunks across the disks, change after the growing of the array from 5 to 7 disks, or does the re-sync re-organize them in such a way a native 7-disk RAID-6 would have been? Thanks some more mdadm output that might be helpful: mdadm version: [~] # mdadm --version mdadm - v2.6.3 - 20th August 2007 mdadm details from one of the disks in the array: [~] # mdadm --examine /dev/sda3 /dev/sda3: Magic : a92b4efc Version : 1.0 Feature Map : 0x0 Array UUID : 1c1614a5:e3be2fbb:4af01271:947fe3aa Name : 0 Creation Time : Tue Jun 10 10:27:58 2014 Raid Level : raid6 Raid Devices : 7 Used Dev Size : 5857395112 (2793.02 GiB 2998.99 GB) Array Size : 29286975360 (13965.12 GiB 14994.93 GB) Used Size : 5857395072 (2793.02 GiB 2998.99 GB) Super Offset : 5857395368 sectors State : clean Device UUID : 7c572d8f:20c12727:7e88c888:c2c357af Update Time : Tue Jun 10 13:01:06 2014 Checksum : d275c82d - correct Events : 7036 Chunk Size : 64K Array Slot : 0 (0, 1, failed, 3, failed, 5, 6) Array State : Uu_u_uu 2 failed mdadm details for the array in the current disk-order (based on my best guess reconstructed from old log-files) [~] # mdadm --detail /dev/md0 /dev/md0: Version : 01.00.03 Creation Time : Tue Jun 10 10:27:58 2014 Raid Level : raid6 Array Size : 14643487680 (13965.12 GiB 14994.93 GB) Used Dev Size : 2928697536 (2793.02 GiB 2998.99 GB) Raid Devices : 7 Total Devices : 5 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Tue Jun 10 13:01:06 2014 State : clean, degraded Active Devices : 5 Working Devices : 5 Failed Devices : 0 Spare Devices : 0 Chunk Size : 64K Name : 0 UUID : 1c1614a5:e3be2fbb:4af01271:947fe3aa Events : 7036 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 19 1 active sync /dev/sdb3 2 0 0 2 removed 3 8 51 3 active sync /dev/sdd3 4 0 0 4 removed 5 8 99 5 active sync /dev/sdg3 6 8 83 6 active sync /dev/sdf3 output from /proc/mdstat (md8, md9, and md13 are internally used RAIDs holding swap, etc; the one I'm after is md0) [~] # more /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] md0 : active raid6 sdf3[6] sdg3[5] sdd3[3] sdb3[1] sda3[0] 14643487680 blocks super 1.0 level 6, 64k chunk, algorithm 2 [7/5] [UU_U_UU] md8 : active raid1 sdg2[2](S) sdf2[3](S) sdd2[4](S) sdc2[5](S) sdb2[6](S) sda2[1] sde2[0] 530048 blocks [2/2] [UU] md13 : active raid1 sdg4[3] sdf4[4] sde4[5] sdd4[6] sdc4[2] sdb4[1] sda4[0] 458880 blocks [8/7] [UUUUUUU_] bitmap: 21/57 pages [84KB], 4KB chunk md9 : active raid1 sdg1[6] sdf1[5] sde1[4] sdd1[3] sdc1[2] sda1[0] sdb1[1] 530048 blocks [8/7] [UUUUUUU_] bitmap: 37/65 pages [148KB], 4KB chunk unused devices: <none>

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• I don't see the running guest in virsh

  - by Louise Hoffman

  Using CentOS 5 with KVM. I have downloaded this KVM applicance, and when unzipped it is just a .img file. No xml file supplied. I can start the guest with /usr/libexec/qemu-kvm -hda /data/kvm/slash.img -m 512 and it works. Now I would like to make a config file for the guest. The problem is when I do # virsh -c qemu:///system list Id Name State ---------------------------------- # I don't see the guest as expected. Does anyone know what is wrong?

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• Only tunnel certain applications via OpenVPN

  - by jinjin

  Hi, I've purchased a VPN solution, it works correctly when I have "redirect-gateway def1" in the configuration file (routing all traffic through the VPN). However when I remove that line from the configuration file, I am still able to ping-out of the machine (ping -I tap0), however I cannot ping the IP assigned to the machine (it's a public ip), i get the error: Destination Host Unreachable. I only want to have certain applications sending traffic through the VPN tunnel (eg: ZNC, irssi), all of which i can select which IP they use. However they can't recieve any data, making the tunnel essentially useless to me when disabling redirect-gateway. Any ideas on how to allow specific applications use the tunnel, without of forcing everything to go through it? My configuration file is as follows: dev tap remote #.#.#.# float #.#.#.# port 5129 comp-lzo ifconfig #.#.#.# 255.255.255.128 route-gateway #.#.#.# #redirect-gateway def1 secret key.txt cipher AES-128-CBC The output of ifconfig -a when the tunnel is connected: tap0 Link encap:Ethernet HWaddr 00:ff:47:d3:6d:f3 inet addr:#.#.#.# Bcast:#.#.#.# Mask:255.255.255.255 inet6 addr: <snip> Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:612 errors:0 dropped:0 overruns:0 frame:0 TX packets:35 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:25704 (25.1 KiB) TX bytes:6427 (6.2 KiB) EDIT: the Bcast:#.#.#.# (ifconfig) is different from route-gateway #.#.#.# (openvpn) if that makes any difference.

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• installPrep.sh / validate.pl for Oracle 11g database on Red Hat EL 5

  - by cagcowboy

  For Oracle 9i + 10g (database), there used to be a really helpful script that you could run to validate your environment was correct before you did the install. Does such a thing exist for 11g does anyone know? Or is the validation finally done by the OUI? If something similar does still exist, please can someone point me in the right direction?

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• USB HDD disconnects unexpectedly un Ubuntu

  - by icefex

  My external USB-HDD disconnects sometimes without reason. If I try to remount it it works a few minutes but then the same thing. Here the output of dmesg

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• Strange sound behavior

  - by caarlos0

  First of all, sorry for the tittle. English isn't my native language, and I can't find a word to describe the strange behavior I'm getting here. In the most simple explanation, is like sound keeps going down and up again... Think in a kid with that old radios that have a circled volume button. Think like these kid keeps "turning" the volume button. That is the behavior I'm getting here. At first, I believed that it was a pulseaudio issue, but, it isn't. I followed the wiki part I think that should be my problem, but it didn't work. After that, as I'm using XFCE, I didn't really need pulseaudio, so I removed it and stays with a clean alsa, hopping that will fix my problem. Sweet mistake. It really looks like a kid looking for trouble. I believed it worked, and, suddenly, here is the same issue again. BTW: I have a full-upgraded testing system (yeah, I upgraded to testing hopping for new pulseaudio version which fix the issue), no pulseaudio at all, just xfce, started with startxfce. What can I do to fix this? It's extremely annoying... sometimes I just want to throw my laptop in the wall because of this. Any extra info you need, please, tell me. Thanks in advance -- EDIT: My alsamixer is like this: And here is a video with the sound behavior.

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• Disk monitor script with long file systems

  - by DD.

  $ df -H Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_app001-lv_root 34G 12G 21G 35% / tmpfs 8.4G 0 8.4G 0% /dev/shm /dev/sda1 508M 54M 429M 12% /boot /dev/mapper/vg_app001-lv_home 19G 309M 17G 2% /home I want to run a disk monitor script but because the filesystem is so long the row has been split into two lines and the script fails. Any suggestions?

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• /etc/exports file not read on boot

  - by netimen

  I added some entries into my /etc/exports file. But when I boot my system, the file is not read. I check it by sudo exportfs — it returns nothing (also I can't mount the exported folders on other systems). Then I run sudo expotfs -a and then again sudo exportfs — and now all my exported folders are listed (and now I can mount the exported folders on other systems). I'm running kubuntu 9.04 with 2.6.28-11-generic kernel

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• How do I tell mdadm to start using a missing disk in my RAID5 array again?

  - by Jon Cage

  I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine. When I had it all back together and ran up Ubuntu, I had some problems with disks not being detected. A couple of reboots later and I'd solved that issue. The problem now is that the 3-disk array is showing up as degraded every time I boot up. For some reason it seems that Ubuntu has made a new array and added the missing disk to it. I've tried stopping the new 1-disk array and adding the missing disk, but I'm struggling. On startup I get this: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d1 : inactive sdf1[2](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] I have two RAID arrays and the one that normally pops up as md1 isn't appearing. I read somewhere that calling mdadm --assemble --scan would re-assemble the missing array so I've tried first stopping the existing array that ubuntu started: root@uberserver:~# mdadm --stop /dev/md_d1 mdadm: stopped /dev/md_d1 ...and then tried to tell ubuntu to pick the disks up again: root@uberserver:~# mdadm --assemble --scan mdadm: /dev/md/1 has been started with 2 drives (out of 3). So that's started md1 again but it's not picking up the disk from md_d1: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid5 sde1[1] sdf1[2] 3907023872 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] md_d1 : inactive sdd1[0](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] What's going wrong here? Why is Ubuntu trying to pick up sdd into a different array? How do I get that missing disk back home again? [Edit] - After adding the md1 to mdadm.conf it now tries to mount the array on startup but it's still missing the disk. If I tell it to try and assemble automatically I get the impression it know it needs sdd but can't use it: root@uberserver:~# mdadm --assemble --scan /dev/md1: File exists mdadm: /dev/md/1 already active, cannot restart it! mdadm: /dev/md/1 needed for /dev/sdd1... What am I missing?

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• Cannot Connect to VSFTP outside of network

  - by jnolte

  I am having a hair pulling issue with my VSFTPD. I am not sure where to turn and I have went through to make sure everything is working properly and when trying to connect to ftp using ftp localhost I am able to login with the username and password I have specified. When I try to connect from outside I get the prompt Connected to domainname.com. but no prompt for user and password in addition when using an FTP client it hangs up and never connects. The server is running Ubuntu 12.04 LTS and VSFTPD 2.3.5 Here is the output of running iptables -L : http://pastie.org/4892233 Here is he output when running ps -FC vsftpd : root 14343 1 0 1168 984 3 16:55 ? 00:00:00 /usr/sbin/vsftpd Here is output of running netstat -tlpn | grep vsftpd : tcp6 0 0 :::21 :::* LISTEN 14343/vsftpd I have uninstalled and reinstalled many times and tried several different configurations and am at a complete loss on why this may not be working. We very often use the same configuration on the same type of servers with no issues. Thank you in advance for your help.

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• Add Clamd as a service to CentOS?

  - by Josh

  As I understand I think I need to add something to init.d, but I am not sure what to add. At the moment to start clamav I have to do clamd start. I would like it as a service so I can start it on run level 3 as a service. I realize I could probably do this through a shell script in the right runlevel, but I would like to be able to use chkconfig to configure it.

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• Using cookies with lynx

  - by XXL

  lynx -cfg=cfg.file $URL this works with the following contents of the .cfg file: SET_COOKIES:TRUE ACCEPT_ALL_COOKIES:TRUE PERSISTENT_COOKIES:TRUE COOKIE_FILE:cookie.file however, this does not: lynx -cookies=1 -accept_all_cookies=1 -cookie_file=cookie.file $URL if it's going to be of any help - here's the trace: parse_arg(arg_name=-cookies=1, mask=1, count=2) parse_arg lookup(cookies=1) ...skip (mask 1/4) parse_arg(arg_name=-accept_all_cookies=1, mask=1, count=3) parse_arg lookup(accept_all_cookies=1) ...skip (mask 1/4) parse_arg(arg_name=-cookie_file=cookie.file, mask=1, count=4) parse_arg lookup(cookie_file=cookie.file) ...skip (mask 1/4) parse_arg(arg_name=$URL, mask=1, count=5) parse_arg startfile:$URL obvious question, why? the actual difference, from what i see, is the inability to trigger "PERSISTENT_COOKIES:TRUE" by command-line options in lynx. or, maybe, i have overlooked/misunderstood something?

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• Change permission to /proc/net/ip_conntrack on Ubuntu server 9.10

  - by bjarkef

  Hi I have a script that needs to extract certain information form the /proc/net/ip_conntrack file once in a while. I do not wish to run this script as the root user. Default permissions for the file is: $ ls -lah /proc/net/ip_conntrack -r--r----- 1 root root 0 2010-03-28 12:18 /proc/net/ip_conntrack I can change it with: sudo chmod o+r /proc/net/ip_conntrack But that does not stick after a reboot. Is there some configuration file for file-permissions in the /proc directory in Ubuntu Server 9.10? Or do I just have to stick a chmod line in some startup script?

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