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• Diagnosing packet loss / high latency in Ubuntu

  - by Sam Gammon

  We have a Linux box (Ubuntu 12.04) running Nginx (1.5.2), which acts as a reverse proxy/load balancer to some Tornado and Apache hosts. The upstream servers are physically and logically close (same DC, sometimes same-rack) and show sub-millisecond latency between them: PING appserver (10.xx.xx.112) 56(84) bytes of data. 64 bytes from appserver (10.xx.xx.112): icmp_req=1 ttl=64 time=0.180 ms 64 bytes from appserver (10.xx.xx.112): icmp_req=2 ttl=64 time=0.165 ms 64 bytes from appserver (10.xx.xx.112): icmp_req=3 ttl=64 time=0.153 ms We receive a sustained load of about 500 requests per second, and are currently seeing regular packet loss / latency spikes from the Internet, even from basic pings: sam@AM-KEEN ~> ping -c 1000 loadbalancer PING 50.xx.xx.16 (50.xx.xx.16): 56 data bytes 64 bytes from loadbalancer: icmp_seq=0 ttl=56 time=11.624 ms 64 bytes from loadbalancer: icmp_seq=1 ttl=56 time=10.494 ms ... many packets later ... Request timeout for icmp_seq 2 64 bytes from loadbalancer: icmp_seq=2 ttl=56 time=1536.516 ms 64 bytes from loadbalancer: icmp_seq=3 ttl=56 time=536.907 ms 64 bytes from loadbalancer: icmp_seq=4 ttl=56 time=9.389 ms ... many packets later ... Request timeout for icmp_seq 919 64 bytes from loadbalancer: icmp_seq=918 ttl=56 time=2932.571 ms 64 bytes from loadbalancer: icmp_seq=919 ttl=56 time=1932.174 ms 64 bytes from loadbalancer: icmp_seq=920 ttl=56 time=932.018 ms 64 bytes from loadbalancer: icmp_seq=921 ttl=56 time=6.157 ms --- 50.xx.xx.16 ping statistics --- 1000 packets transmitted, 997 packets received, 0.3% packet loss round-trip min/avg/max/stddev = 5.119/52.712/2932.571/224.629 ms The pattern is always the same: things operate fine for a while (<20ms), then a ping drops completely, then three or four high-latency pings (1000ms), then it settles down again. Traffic comes in through a bonded public interface (we will call it bond0) configured as such: bond0 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:5d inet addr:50.xx.xx.16 Bcast:50.xx.xx.31 Mask:255.255.255.224 inet6 addr: <ipv6 address> Scope:Global inet6 addr: <ipv6 address> Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:527181270 errors:1 dropped:4 overruns:0 frame:1 TX packets:413335045 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:240016223540 (240.0 GB) TX bytes:104301759647 (104.3 GB) Requests are then submitted via HTTP to upstream servers on the private network (we can call it bond1), which is configured like so: bond1 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:5c inet addr:10.xx.xx.70 Bcast:10.xx.xx.127 Mask:255.255.255.192 inet6 addr: <ipv6 address> Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:430293342 errors:1 dropped:2 overruns:0 frame:1 TX packets:466983986 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:77714410892 (77.7 GB) TX bytes:227349392334 (227.3 GB) Output of uname -a: Linux <hostname> 3.5.0-42-generic #65~precise1-Ubuntu SMP Wed Oct 2 20:57:18 UTC 2013 x86_64 GNU/Linux We have customized sysctl.conf in an attempt to fix the problem, with no success. Output of /etc/sysctl.conf (with irrelevant configs omitted): # net: core net.core.netdev_max_backlog = 10000 # net: ipv4 stack net.ipv4.tcp_ecn = 2 net.ipv4.tcp_sack = 1 net.ipv4.tcp_fack = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_timestamps = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_max_syn_backlog = 10000 net.ipv4.tcp_congestion_control = cubic net.ipv4.ip_local_port_range = 8000 65535 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_thin_dupack = 1 net.ipv4.tcp_thin_linear_timeouts = 1 net.netfilter.nf_conntrack_max = 99999999 net.netfilter.nf_conntrack_tcp_timeout_established = 300 Output of dmesg -d, with non-ICMP UFW messages suppressed: [508315.349295 < 19.852453>] [UFW BLOCK] IN=bond1 OUT= MAC=<mac addresses> SRC=118.xx.xx.143 DST=50.xx.xx.16 LEN=68 TOS=0x00 PREC=0x00 TTL=51 ID=43221 PROTO=ICMP TYPE=3 CODE=1 [SRC=50.xx.xx.16 DST=118.xx.xx.143 LEN=40 TOS=0x00 PREC=0x00 TTL=249 ID=10220 DF PROTO=TCP SPT=80 DPT=53817 WINDOW=8190 RES=0x00 ACK FIN URGP=0 ] [517787.732242 < 0.443127>] Peer 190.xx.xx.131:59705/80 unexpectedly shrunk window 1155488866:1155489425 (repaired) How can I go about diagnosing the cause of this problem, on a Debian-family Linux box?

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• tomcat 5.5 startup script on Ubuntu server

  - by Registered User

  Can any one share their Tomcat startup script I am looking for a tomcat start up script on a Ubuntu machine. My Ubuntu is 10.04 server. The tomcat is 5.5.30. It is in /opt/apache-tomcat-5.5.31 I tried a script #!/bin/bash # # tomcat # # chkconfig: # description: Start up the Tomcat servlet engine. # Source function library. . /lib/lsb/init-functions RETVAL=$? CATALINA_HOME="/opt/apache-tomcat-5.5.31" case "$1" in start) if [ -f $CATALINA_HOME/bin/startup.sh ]; then echo $"Starting Tomcat" /opt/apache-tomcat-5.5.31/bin/startup.sh fi ;; stop) if [ -f $CATALINA_HOME/bin/shutdown.sh ]; then echo $"Stopping Tomcat" /opt/apache-tomcat-5.5.31/bin/shutdown.sh fi ;; *) echo $"Usage: $0 {start|stop}" exit 1 ;; esac exit $RETVAL but it did not worked after a reboot. But the same script works if I do /etc/init.d/tomcat start or /etc/init.d/tomcat stop I have done update-rc.d tomcat defaults as it is a Ubuntu server but on reboot all of this fails to work.

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• Rails3 environment running very slow on Windows XP, Ubuntu 9.04, Ubuntu 9.10

  - by bergyman

  I've tried all three (granted the Ubuntu versions were via VirtualBox with XP as a host, but I gave the images all the available RAM my system has). Loading the rails environment is taking 30-60 seconds. rails console, rake test:units - anything that requires rails to load up. And not just on the first go - every time. I've even used autotest to see if it helps with execution time for unit tests, but it doesn't. Any time I change one test, it still takes 30 seconds to load them, and then about 4 seconds to execute. Has anyone else come across this issue? Has anyone figured out any way to fix this?

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• DNS configuration issues. Clients inside network unable to resolve DNS server's name

  - by hydroparadise

  Setup the DNS service on Ubuntu 12.04 64 and all apears to be well except that my dhcp clients do not recognize my DNS servers hostname. When doing a nslookup on one of my Windows clients, I get C:\Users\chad>nslookup Default Server: UnKnown Address: 192.168.1.2 Where I would expect the FQDN in the spot where UnKnown is seen. The DNS server know's itself pretty well, but I think only because I have an entry in the /etc/hosts file to resolve. There's so many places to look I don't even know where to begin. Are there any logs I can look at? Something. Places I've looked at and configured: /etc/bind/zones/domain.com.db /etc/bind/zones/rev.1.168.192.in-addr.arpa /etc/bind/named.conf.local EDIT: '/etc/bind/zones/rev.1.168.192.in-addr.arpa' @ IN SOA dns-serv1.mydomain.com [email protected]. ( 2006081401; 28800; 604800; 604800; 86400 ) IN NS dns-serv1.mydomain.com. 2 IN PTR dns-serv1 2 IN PTR mydomain.com EDIT 2: '/etc/bind/named.conf.local' zone "mydomain.com" { type master; file "/etc/bind/zones/mydomain.com.db"; }; zone "1.168.192.in-addr.arpa" { type master; file "/etc/bind/zones/rev.0.168.192.in-addr.arpa"; };

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• Ubuntu not connecting to network in Hyper-V

  - by soandos

  I am unable to connect the Ubuntu guest (both 12.10 and 12.04) to the internet via hyper-V. Here is what I have done so far (with much thanks due to @Kronos's blog post on the topic): Created a switch in the switch manager with connection set to external, selected my wifi card (Intel Centrino Ultimate-N 6300 AGN). If it matters, the Microsoft Filtering Platform is checked under extensions. Added this switch to my Ubuntu guest. I also tried a different wireless card (Aethros 9285) same issue. Connecting through my wired card works just fine (assume that I select that card, and I am wired in of course). Making it a legacy network adapter does not fix the issue. Ubuntu can see this connection, but is unable to connect to it. What follows is what I attempted to do to get Ubuntu to connect: Start and restart the network manager Restart the machine Verify that it could in fact see the adapter (resulted in device not ready a few times) How can I get this to work properly?

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• Can't set 1280x1024 on Ubuntu with Nvidia Geforce 8400 GS

  - by torbengb

  Ubuntu doesn't offer 1280x1024 but that's what my monitor has -- I want to set that resolution but need help doing so. Ubuntu offers 1360x768, 1152x864, 1024x768 when using the Nvidia driver version 180. This is Ubuntu 9.04 installed as "Wubi" through Windows, I believe it's the amd64 version. Google gave me this precise explanation which is complete latin to me; I'm a Windows guy and not familiar with Terminal. These SU questions also don't provide answers, hence this new question. I hope you can help, and I will provide additional info if required.

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• nginx starts up before apache

  - by paullb

  I've been fumbling through setting up redmine on a unbuntu (12.04) box and somewhere along the line NginX got set up and now apache no longer loads because nginx has already grabbed the port. I tried removing NginX with the below command but that didn't seem to make any difference. When I restarted the server and pointed my web browser I still got the "Welcome to NginX" message sudo apt-get purge nginx I have confirmed that NginX is gone because when I run the above now I get as an output Package nginx is not installed, so not removed Yet everytime I start the machine it is running again. I noticed the following for the running processes (if that is helpful) root 923 0.0 0.0 76784 1280 ? Ss 03:00 0:00 nginx: master process /usr/sbin/nginx www-data 925 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process www-data 926 0.0 0.1 77092 2204 ? S 03:00 0:00 nginx: worker process www-data 927 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process www-data 928 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process Any advice for bringing back apache2 as the "default" (for lack of a better term) web server?

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• MySQL open files limit

  - by Brian

  This question is similar to set open_files_limit, but there was no good answer. I need to increase my table_open_cache, but first I need to increase the open_files_limit. I set the option in /etc/mysql/my.cnf: open-files-limit = 8192 This worked fine in my previous install (Ubuntu 8.04), but now in Ubuntu 10.04, when I start the server up, open_files_limit is reported to be 1710. That seems like a pretty random number for the limit to be clipped to. Anyway, I tried getting around it by adding a line like this in /etc/security/limits.conf: mysql hard nofile 8192 I also tried adding this to the pre-start script in mysql's upstart config (/etc/init/mysql.conf): ulimit -n 8192 Obviously neither of those things worked. So where is the hoop that has been added between Ubuntu 8.04 and 10.04 through which I must jump in order to actually increase the open files limit?

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• How to debug xsane "no devices available" error on 64 bit Ubuntu 10.04

  - by BD at Rivenhill

  I have a Brother MFC-J615W printer/scanner and I wish to use the scanning feature across a network with a computer running 64-bit Ubuntu 10.04. I have installed the drivers from the Brother website and followed all of the instructions, and printing works fine, but xsane (installed from repositories) produces a popup with the message "no devices available" on startup. I recently had success with a similar approach when installing drivers for a Brother MFC-495CW on 32-bit Unbuntu 9.10, so I am aware of issues such as requiring root access if the driver permissions are not set correctly, but running xsane as root does not solve this problem. Are there any tools available to debug this problem further or does anyone have advice on how to proceed?

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• Black screen on Ubuntu 12.04

  - by user1648371

  I've just upgraded to Ubuntu 12.04 and I'm experiencing some problems. The first thing I noticed is that when I click the Workspace switcher all I get is a black screen (I can guess where the different workspaces are located and clicked on them, not a practical solution though). In addition when I lock the screen or suspend the laptop (a Vaio VPCEB4M1E) I get a shifted screen (I see the right most vertical stripe on the left size of the monitor and nothing about all the rest, to put it clearly I can see the gear that allows me to turn the pc off, etc, but not much more..) when I go to the additional driver menu I see the "ATI/AMD proprietary FGLRX graphics driver" are installed and the post-release update version is available. I don't know if the problem is driver related, so before doing anything I'd like to get some suggestions from you guys. Thanks you!

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• Path of md device wrong after reboot

  - by flammi88

  I have to set up a software raid (level1) on a Ubuntu server 12.04. It should serve files in the network via Samba. The server has the following disks: 250gb Sata hdd (Ubuntu is installed on that drive) 2 TB Sata hdd (first disk in raid array, data disk) 2 TB Sata hdd (second data disk) I created one partition on every data disk with the type Linux raid autodetect. In the second step I created the raid1 with the following command: mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1 After that, I added the array to the mdconf: mdadm --examine --scan >> /etc/mdadm/mdadm.conf The problem is: After a reboot the array is not available on the path /dev/md0. Instead of that it gets reassembled as /dev/md/0 but it is not very reliable. Has anybody a solution for this issue?

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• HT Link Sync Error after Ubuntu 10.04 LTS Installation

  - by marklab

  Update 1 I just assembled an exact replica of this server, and successfully installed Ubuntu 10.04 LTS in a RAID10 configuration. The success was confirmed by a login to the initial account. There must be a hardware component that is faulty. Since the error mentions HT, which I believe to be Hyper Threading, I will start with the CPUs. Please indicate if this error is more strongly associated with any other piece of hardware. Or make a recommendation of another approach that would be good for this issue. Issue I was attempting to install Ubuntu 10.04 LTS on this system with the board RAID10 configured. However, the installation failed at the partitioning stage by rebooting the system. Upon reboot, there is an error report after POST listing the following: Node0: NB WatchDog Timer Error Node1: HT Link Sync Error Node2: HT Link Sync Error ... Node7: HT Link Sync Error Press F1 to continue/resume. After pressing F1 the system will boot from the Ubuntu 10.04 LTS installation disc. However, it will fail at the same stage, and go through the same process from there. Hardware CPU: AMD OPTERON X12 6172 G34 2.1G 18MB Motherboard: Supermicro H8QG6-F HDD: WD Caviar Green 2TB 5.4K RPM Troubleshooting I disabled RAID10 on the system, and installed the Ubuntu on a single drive. It installed successfully. I then went back to a RAID10 setup and attempted to install on the system again, and was able to make it through the partitioning stage. However, upon reboot, the system reported: Error: file not found, and then booted me into the Grub Rescue console. I feel I have aggravated the problem at this point because when I attempted to install from the boot disc again, the system reboots upon hitting enter to even start the installation process. It does the same thing when trying to boot from an Ubuntu 11 disc. I have not been able to find any information on this HT Link Sync Error, which I feel may have started the problems I am experiencing now with the installation of the OS. I am also aware that Ubuntu is said not to be supported by the motherboard according to Supermicro's site. However, since I was able to install it successfully on a single drive, I do not believe it is incompatible. I would like to know a reason for why it's failing to install on/off.

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• Disabling ‘Connect Automatically” in Ubuntu 10.04

  - by The Guy

  Does anybody know how to disable the “Connect Automatically” feature in Network Connections\Wired\Auto eth0\Edit from the command line (Ubuntu 10.04)?

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• Repair GRUB bootloader for multiboot system

  - by user1715324

  I have two hard disks – one a 1TB and the other a 250 GB. I installed the OSes in the following order: Windows 7 on the first hard disk (1 TB) After that Kubuntu 12.04 on a partition (/dev/sdb7) on the second hard disk (250 GB) The second drive also contains an NTFS partition. Now, kubuntu's bootloader was installed on the second hard drive's MBR (and successfully detected Windows 7). So, whenever I wanted to load Windows I used to select the first hard disk from the BIOS boot menu and the second hard disk whenever I wanted to load kubuntu. I know I could have set the second hard disk as the default drive, still I prefered this method. The problem started when I installed Linux Mint 13 on the second hard disk (/dev/sdb3) and overwrote kubuntu's original MBR. Now, the GRUB just detects Mint and Windows. The MBR on the 1 TB hard disk is untouched. Is there a way I can modify the MBR on the second hard disk now so that it will show kubuntu and Mint both?

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• MySQL permission errors

  - by dotancohen

  It seems that on a Ubuntu 14.04 machine the user mysql cannot access anything. It is not writing logs nor reading files. Witness: - bruno():mysql$ cat /etc/passwd | grep mysql mysql:x:116:127:MySQL Server,,,:/nonexistent:/bin/false - bruno():mysql$ sudo mysql_install_db Installing MySQL system tables... 140818 18:16:50 [ERROR] Can't read from messagefile '/usr/share/mysql/english/errmsg.sys' 140818 18:16:50 [ERROR] Aborting 140818 18:16:50 [Note] Installation of system tables failed! Examine the logs in /var/lib/mysql for more information. ...boilerplate trimmed... - bruno():mysql$ ls -la /usr/share/mysql/english/errmsg.sys -rw-r--r-- 1 root root 59535 Jul 29 13:40 /usr/share/mysql/english/errmsg.sys - bruno():mysql$ wc -l /usr/share/mysql/english/errmsg.sys 16 /usr/share/mysql/english/errmsg.sys Here we have seen that mysql cannot read /usr/share/mysql/english/errmsg.sys even though the permissions are open to read it, and in fact the regular login user can read the file (with wc). Additionally, MySQL is not writing any logs: - bruno():mysql$ ls -la /var/log/mysql total 8 drwxr-s--- 2 mysql adm 4096 Aug 18 16:10 . drwxrwxr-x 18 root syslog 4096 Aug 18 16:10 .. What might cause this user to not be able to access anything? What can I do about it?

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• Can't find disk usage in one directory

  - by Xster

  Similar questions are asked frequently but no suggested answers solved my issue. I have some disk space usage that I can't find as well. In df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 144183992 136857180 2652 100% / udev 2013316 4 2013312 1% /dev tmpfs 808848 876 807972 1% /run none 5120 0 5120 0% /run/lock none 2022116 76 2022040 1% /run/shm overflow 1024 0 1024 0% /tmp I checked the inodes, I checked lsof for +L1 or deleted files, I rebooted, I checked for files hidden behind mounts but none of them were the issue. It grows periodically and I'm running out of things to delete to feed the beast. It's all in the home directory of the only user I have. In du in ~ du -h --max-depth=1 192K ./.nv 2.1M ./.gconf 12K ./Pictures 1.6M ./.launchpadlib 12K ./Public 24K ./.TemporaryItems 8.9M ./.cache 12K ./Network Trash Folder 28K ./.vnc 11M ./.AppleDB 48K ./.subversion 1.9G ./.xbmc 8.0K ./.AppleDesktop 12K ./.dbus 81M ./.mozilla 12K ./Music 160K ./.gnome2 44K ./Downloads 692K ./.zsh 236K ./.AppleDouble 64K ./.pulse 4.0K ./.gvfs 1.4M ./.adobe 44K ./.pki 44K ./.compiz-1 168K ./.config 1.4M ./.thumbnails 12K ./Templates 912K ./.gstreamer-0.10 8.0K ./.emacs.d 92K ./Desktop 1.3M ./.local 12K ./Ubuntu One 12K ./Documents 296K ./.fontconfig 12K ./.qt 12K ./.gnome2_private 20K ./.ssh 20K ./.mission-control 12K ./Videos 12K ./Temporary Items 640K ./.macromedia 124G . I can't find a way to figure out how it got to that 124G in that directory. There are no mount points in home.

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• Ubuntu Natty: 32-bit userland, 64-bit kernel?

  - by dsimcha

  I'm trying to manually install a 64-bit kernel for 32-bit Ubuntu. I have my reasons for doing so, but they're too complicated to explain here. Prior to Natty, this worked fine. Now, on Natty, I get the following error message when I try doing it the same way: dsimcha@dsimcha-laptop:~$ sudo dpkg -i --force-architecture linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb [sudo] password for dsimcha: dpkg: error processing linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb (--install): cannot access archive: No such file or directory Errors were encountered while processing: linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb dsimcha@dsimcha-laptop:~$ cd Downloads/ dsimcha@dsimcha-laptop:~/Downloads$ sudo dpkg -i --force-architecture linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb dpkg: warning: overriding problem because --force enabled: package architecture (amd64) does not match system (i386) (Reading database ... 159153 files and directories currently installed.) Preparing to replace linux-image-2.6.38-8-server:amd64 2.6.38-8.42 (using linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb) ... Done. Unpacking replacement linux-image-2.6.38-8-server:amd64 ... Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.38-8-server /boot/vmlinuz-2.6.38-8-server run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.38-8-server /boot/vmlinuz-2.6.38-8-server dpkg: dependency problems prevent configuration of linux-image-2.6.38-8-server:amd64: linux-image-2.6.38-8-server:amd64 depends on initramfs-tools (>= 0.36ubuntu6). linux-image-2.6.38-8-server:amd64 depends on coreutils | fileutils (>= 4.0); however: Package coreutils:amd64 is not installed. linux-image-2.6.38-8-server:amd64 depends on module-init-tools (>= 3.3-pre11-4ubuntu3); however: linux-image-2.6.38-8-server:amd64 depends on wireless-crda; however: dpkg: error processing linux-image-2.6.38-8-server:amd64 (--install): dependency problems - leaving unconfigured Errors were encountered while processing: linux-image-2.6.38-8-server:amd64 When I try the dependencies manually, I get, for example: dsimcha@dsimcha-laptop:~/Downloads$ sudo dpkg -i --force-architecture coreutils_8.5-1ubuntu6_amd64.deb dpkg: warning: overriding problem because --force enabled: package architecture (amd64) does not match system (i386) dpkg: error processing coreutils_8.5-1ubuntu6_amd64.deb (--install): coreutils:amd64 8.5-1ubuntu6 (Multi-Arch: no) is not co-installable with coreutils:i386 8.5-1ubuntu6 (Multi-Arch: no) which is currently installed Errors were encountered while processing: coreutils_8.5-1ubuntu6_amd64.deb Has anyone had any success installing 64-bit kernels on 32-bit Natty? If so, how can this be done?

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• Bash: Read lines in a file scenario with sed or awk

  - by user105566

  I have this scenarios: File Content: 10.1.1.1 10.1.1.2 10.1.1.3 10.1.1.4 I want sed or awk so that when i cat the file every time new line is returned. like First iteration: cat ip | some magic 10.1.1.1 Second iteration returns 10.1.1.2 Third iteration returns 10.1.1.3 Fourth iteration returns 10.1.1.4 and after n number of iterations, it returns to line 1 Fifth iteration returns: 10.1.1.1 Can we do it using sed or awk.

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• How to find cause of main file system going to read only mode

  - by user606521

  Ubuntu 12.04 File system goes to readonly mode frequently. First of all I have read this question file system is going into read only mode frequently already. But I have to know if it's not caused by something else than dying hard drive. This is server provided by my client and I am just runing there some node.js workers + one node.js server and I am using mongodb. From time to time (every 20-50h) system suddenly makes filesystem read only, mongodb process fails (due read-only fs) and my node workers/server (which are started by forever) are just killed. Here is the log from dmesg - I can see there some errors and messages that FS is going to read-only, and there is also some JOURNAL error but I would like to find cause of those errors.. http://speedy.sh/Ux2VV/dmesg.log.txt edit smartctl -t long /dev/sda smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.5.0-23-generic] (local build) Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net SMART support is: Unavailable - device lacks SMART capability. A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options. What I am doing wrong? Same is for sda2. Morover now when I type any command that not exists in shell I get this: Sorry, command-not-found has crashed! Please file a bug report at: https://bugs.launchpad.net/command-not-found/+filebug Please include the following information with the report:

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• Ubuntu hardy to intrepid upgrade hung on starting bluetooth

  - by srboisvert

  I have no bluetooth. Preliminary googling indicates that is probably an issue with some usb devices. I had an external drive, a mouse and a network dongle attached. It is just stalled during the Installing the Upgrades phase - the last commands were "Creating device nodes" Cancel will leave the system in a broken state. What next?

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• Change XRDP keyboard layout to en-gb Ubuntu 12.04

  - by Earl Sven

  Does anybody know how to change the keyboard layout to en-gb in an XRDP session on Ubuntu 12.04? I am using mstsc.exe to connect to an XRDP server hosting an XVNC session, however I cannot work out how to apply the UK keyboard layout. A bit of googling has yeilded these instructions which allow me to change the keymap, however using the keymap file I downloaded from here I loose the ability to use the arrow keys, home/end etc. Comparing the file with the standard one there are substantially more differences than I would expect considering the similarity between the layouts. I only have RDP access to the box so i don't seem to be able to actually generate a new layout per the instructions above, maybe it's a local console thing? Also I can't change either the RDP client used or the RDP server as they are my only access to the system, I don't have local console access. I do have root priveleges on the OS however. Any thoughts? Edit: I have found http:// xrdp.sourceforge.net/documents/keymap/newkeymap.html (apologies for not typing the link properly but the antispam filter won't let me post more than 2 links) this documentation on the XRDP sourceforge page which describes keymap file format. It indicates the values in the keymap files are unicode 0x64 etc, however the files I have already on my system seem to use a different format 0:0 or 65307:27 etc, does anybody know what the difference is?

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• Creating mdraid device on top of other existing mdraid devices

  - by Dmitriusan

  I'm considering creating something like "hierarchical raid" and wondering whether it is possible using pure mdraid. Moreover, I'm going to boot from this device. I'm using Ubuntu Server 12.04 LTS with Grub2 bootloader. Motivation behind doing that is: I have 4 x 1tb 7200rpm disks. Two are newer and faster (up to 200mb/sec) and other two are slower (up to 140mb/sec). I want to create RAID-0 device from them. When creating such RAID-0 directly from 4 hard disks, I get summary speed up to ~480mb/sec. That is roughly 4*120mb/sec, so RAID-0 works with speed of the slowest device. I have an idea to create a separate RAID-0 md0 device from 500gb partitions of slower hard disks. Theoretically, this md0 device will have speed 2*140=240~280mb/sec. After that, I'm going to add this md0 device to RAID-0 with faster disks, finishing with up to 3*200=600mb/sec. Stripe-width for this raid will be 2x times bigger than for underlying raid with slow disks. Questions are: is it possible or I'm missing something? will that work as expected? can I boot from such consolidated raid device? any better ideas? any pitfalls? I don't want to use fakeraid for consolidating slow disks for multiple reasons (portability, ability to customize parameters and so on). PS Speed is needed for home virtualization server and just for experience/fun. Reliability is provided via regular automatic backups to a separate device. PPS I considered also using different stripe-width for hard disks with different speed in single raid, but mdraid does not seem to support that.

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• Elasticsearch won't start anymore

  - by Oleander

  I restarted my elasticsearch instance 5 days ago and I haven't manage to start it since then. I get no output in the log file /var/log/elasticsearch/ nor does the elasticsearch binary print any information when running at using elasticsearch -f. I once manage to get this output. [2012-11-15 22:51:18,427][INFO ][node ] [Piper] {0.19.11}[29584]: initializing ... [2012-11-15 22:51:18,433][INFO ][plugins ] [Piper] loaded [], sites [] Running curl http://localhost:9200 resulted in curl: (7) couldn't connect to host. I've tried increasing the memory from 3gb to 10gb, but that didn't make any diffrence. Running /etc/init.d/elasticsearch start takes 30 seconds. ps aux | grep elasticsearch results in this output. /usr/local/share/elasticsearch/bin/service/exec/elasticsearch-linux-x86-64 /usr/local/share/elasticsearch/bin/service/elasticsearch.conf wrapper.syslog.ident=elasticsearch wrapper.pidfile=/usr/local/share/elasticsearch/bin/service/./elasticsearch.pid wrapper.name=elasticsearch wrapper.displayname=ElasticSearch wrapper.daemonize=TRUE wrapper.statusfile=/usr/local/share/elasticsearch/bin/service/./elasticsearch.status wrapper.java.statusfile=/usr/local/share/elasticsearch/bin/service/./elasticsearch.java.status wrapper.script.version=3.5.14 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java -Delasticsearch-service -Des.path.home=/usr/local/share/elasticsearch -Xss256k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Djava.awt.headless=true -Xms1024m -Xmx1024m -Djava.library.path=/usr/local/share/elasticsearch/bin/service/lib -classpath /usr/local/share/elasticsearch/bin/service/lib/wrapper.jar:/usr/local/share/elasticsearch/lib/elasticsearch-0.19.11.jar:/usr/local/share/elasticsearch/lib/elasticsearch-0.19.11.jar:/usr/local/share/elasticsearch/lib/jna-3.3.0.jar:/usr/local/share/elasticsearch/lib/log4j-1.2.17.jar:/usr/local/share/elasticsearch/lib/lucene-analyzers-3.6.1.jar:/usr/local/share/elasticsearch/lib/lucene-core-3.6.1.jar:/usr/local/share/elasticsearch/lib/lucene-highlighter-3.6.1.jar:/usr/local/share/elasticsearch/lib/lucene-memory-3.6.1.jar:/usr/local/share/elasticsearch/lib/lucene-queries-3.6.1.jar:/usr/local/share/elasticsearch/lib/snappy-java-1.0.4.1.jar:/usr/local/share/elasticsearch/lib/sigar/sigar-1.6.4.jar -Dwrapper.key=k7r81VpK3_Bb3N_5 -Dwrapper.port=32000 -Dwrapper.jvm.port.min=31000 -Dwrapper.jvm.port.max=31999 -Dwrapper.disable_console_input=TRUE -Dwrapper.pid=23888 -Dwrapper.version=3.5.14 -Dwrapper.native_library=wrapper -Dwrapper.service=TRUE -Dwrapper.cpu.timeout=10 -Dwrapper.jvmid=1 org.tanukisoftware.wrapper.WrapperSimpleApp org.elasticsearch.bootstrap.ElasticSearchF My current system: ElasticSearch Version: 0.19.11, JVM: 23.2-b09 Ubuntu 12.04 LTS I've tried re-install elasticsearch, removing old directories. Why can't I get it to start?

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• Wireless not working on ubuntu 12.04

  - by Yosef

  I just install ubuntu 12.04 but wirelless not works(windows 7 wirelless works). I open my windows 7 and see under Network Adapters: Edimax 802.11n Wireless Adapter Realtek PCIe GBE Family Controller Which drivers i should download to install them on ubuntu 12.04 to make wireless work? And how i install this drivers on ubuntu after i copy them to usb. (I can have only wireless connection not wire - soo i nhave to dowload the drivers with windows then copy them to ubuntu) Thanks

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• Accessing Netatalk/AFP Shares from OS X Snow Leopard

  - by j4nus_

  Recently upgraded Ubuntu home server from 8.04 client to 10.04 server and reinstalled all services therein. One of them is a Netatalk daemon that I configured in a fashion similar to this website: http://www.kremalicious.com/2008/06/ubuntu-as-mac-file-server-and-time-machine-volume/ Finder recognizes my server and the afp service, yet when I attempt to log in (using valid credentials), Finder indicates its the wrong username and password. I've tried altering some of the config files and my Google-fu to look for solutions, but no luck. Any tips? (This was not an issue under 8.04, if it matters)

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