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• Is it worth moving from Microsoft tech to Linux, NodeJS & other open source frameworks to save money for a start-up?

  - by dormisher

  I am currently getting involved in a startup, I am the only developer involved at the moment, and the other guys are leaving all the tech decisions up to me at the moment. For my day job I work at a software house that uses Microsoft tech on a day to day basis, we utilise .NET, SqlServer, Windows Server etc. However, I realise that as a startup we need to keep costs down, and after having a brief look at the cost of hosting for Windows I was shocked to see some of the prices for a dedicated server. The cheapest I found was £100 a month. Also if the business needs to scale in the future and we end up needing multiple servers, we could end up shelling out £10's of £000's a year in SQL Server / Windows Server licenses etc. I then had a quick look at the price of Linux hosting for a dedicated server and saw the price was waaaaaay lower than windows hosting. One place was offering a machine with 2 cores for less than £20 a month. This got me thinking maybe the way to go is open source on Linux. As I write a lot of Javascript at work (I'm working on a single page backbone app at the moment), I thought maybe NodeJS and a web framework like Express would be cool to use. I then thought that instead of using SQL why not use an open source NoSQL database like MongoDB, which has great support on NodeJS? My only concern is that some of the work the application is going to do is going to be dynamically building images and various other image related stuff, i.e. stuff that is quite CPU heavy - so I'm thinking of maybe writing anything CPU heavy in C++ and consuming it as a module in Node. That's the background - but basically is Linux a good match for: Hosting a NodeJS/Express site? Compiling C++ node modules? Using a NoSQL DB like MongoDB? And is it a good idea to move to these unfamiliar technologies to save money?

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• Using iptables to block ALL outgoing traffic from one NIC?

  - by edanfalls

  Hi, I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read! I have two NICs - eth0 and eth1 - on a linux box and I want to block ALL outbound traffic (TCP and UDP across all ports) from one of the NICs, so that no traffic makes its way back up to the router. What is the command for this? I have only seen examples with specific ports. Thanks in advance.

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• using one disk as cache for others

  - by HugoRune

  Hi Given a PC with several hard drives: Is it possible to use one fast disk as a giant file cache? I.e. automatically copying frequently accessed data to that one disk, and transparently redirecting reads and writes to that disk, so that other drives would only have be accessed occassionally. (writes would have to be forwarded to the other disks after a while of course) Advantages: the other drives could be powered down most of the time; reducing power, heat, noise speed of the other drives would not matter much. cache disk could be solid state. How can I set such a system up? What OS supports these options? Is this possible at all using Windows or Linux?

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• Changing read-write permissions on my external Seagate hard drive

  - by Anthony_JKenn

  I have an external hard drive (Seagate Free Agent) that I normally download files to. I have a dual boot Ubuntu 11.10 along with Windows 7-64 bit. I can read all of my files in my external HD perfectly, but when I attempt to do a download of a file to this drive, I get an "unable to write because of read only" disk error. When I attempt to change the permissions of the disk through the "Properties" bar, I still get an error that I don't have the proper permissions to change permissions. I have heard of "mounting" the disk, but I am afraid of mistakenly reformatting and destroying all the data that I have currently on that drive. How best should I safely change the permissions on that drive so that I can write and download files to the drive?? The drive is listed under /dev/sdc1.

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• My hard disk does't get recognized

  - by SteveL

  For a few days now I have a problem with my 500GB internal hard disk. I am on Linux Mint 13 but I have the same problem with my Windows installation. When running fdisk -l I can see my hard disk (same on BIOS) but I can't mount it even via the disk utility program. In Windows XP I can see it on the My Computer menu but when I click it, it say's: D:\ is not accessible The file or directory is corrupted and unreadable Is there a way to fix it? Or at least save some of my files and format it? Should I be thinking about the worst-case scenario e.g. my HDD is dead? Edit: The filesystem is NTFS.

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• What is stable as Ubuntu in kernel space, but also cutting-edge as Fedora in user land?

  - by HRJ

  I am a long time Fedora user (since Fedora 6). Previously I have used Gentoo (for 2 years) and Slackware (for 5 years). The thing I liked about Fedora is frequency of package updates + great community. But lately I have noticed that Fedora is becoming too cutting-edge, nay, bleeding-edge. They changed the DNS client to be strict, without any warning, which broke some of their own packages for two Fedora releases. More critically, their LVM modules are not compatible across Fedora 12, 13, 14 (sometimes). Ubuntu is nicely polished but seems too stable for my liking. Some of the user-space applications are two major version numbers behind (even in testing or unstable or whatever they call it). Is there any Linux distro that has the stability of Ubuntu in kernel space and the bleeding edge in applications (especially harmless applications like, say, Stellarium)?

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• I suspect that my HDD is causing hardlocks, as all other components have been replaced. How can I check this theory and solve the potential cause?

  - by user867814

  I have had this problem over quite a while now, thorough multiple Linux kernel versions and distributions, as well as replacement of all components, aside from my main HDD - RAM, GPU(twice), mother board, CPU, power supply. What happens is, at one point during the operation of the PC, it will hardlock - everything stops working, external HDD is not shut down correctly and continues to spin until I plug it out and in, there are no system/kernel logs of any kind, and no otherwise nothing that would suggest a cause. Another reason for my suspicion is that the failures happen almost exclusively during HDD read/write activity - shutdown(happens nearly 1/3 of the time so far, it's only been few days though), launching programs, and once during operation of apt. I hope the post is descriptive enough, if you need any additional info, ask(and tell me how to prepare/obtain it), and I will provide. If I'm wrong, point me in the right direction. Thanks in advance.

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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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• Essential topics to be discussed in Linux 101

  - by zengr

  Hi, We are organizing a Linux 101 Workshop for undergrad and grad students. Can you share some ideas/topics that are must for people who are just starting with Linux. Preconditions: No knowledge of Linux OS, philosophy and technical aspects (kernel, shell, commands) Post conditions: A basic crash course of Linux which will give them a good start and answer some basic questions asked on it.

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• creating a .sh file programmatically under windows and running it on a linux system from cygwin

  - by user1296193

  i want to write program, in windows, which will write a .sh file, then connect to a linux machine via cygwin and ssh, and execute that .sh file. I've had to use dos2unix to convert .sh files that I created in windows to run under linux. Obviously if I am executing a script with ssh it will have to be linux formatted to work. so I need to know how to create a linux appropriate .sh file using c or openoffice basic or vBA. thanks!

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• Windows service porting to linux

  - by Sirish Kumar

  I am porting an application which runs as a background service in windows at startup, we are porting the application to linux(SUSE Enterprise server), I'am completely new to linux. Can somebody help me on how to proceed with this. Like Should I build the linux executable After builiding the binary, what changes should I make to linux startup files to run this executable How my service can register call back function to modify or change or send commands to my service while it is running

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• Linux - specific API reference

  - by Goofy

  Hello! Where can I find centralized and complete documentation aboput Linux - specific API? I'm preparing Linux port of my application and i want to use as much Linux - specific features as it's possible. So far I found that Linux provide epoll and inotify API, which are great news for me, because my program works as network server and monitor local file systems.

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• Linux bcm43224 wifi adapter slows down a couple minutes after boot

  - by Blubber

  I just installed Ubuntu on my mid 2012 MacBook Air. Everything worked out of the box, but the wifi is showing some weird behavior. When I first login it's really fast, loading google.com is near instant, and browsing in general feels at least as smooth as it did on Mac OS. However, after a couple minutes the connection slows down dramatically, sometimes it takes over 5s to load google.com, a simple reboot fixes the problem for another couple minutes. Specs: Wifi: 02:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01) Driver: open-source brcmsmac driver Kernel: Linux wega 3.8.0-21-generic #32-Ubuntu SMP Tue May 14 22:16:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Distro: Ubuntu 13.04 (uptodate) I tried a number of things, none of which actually helped Use proprietary sta driver from broadcom Installed firmware into /lib/firmware/brcms (which, as far as I can tell from logs, does not get loaded at all) Switch router to only use 2.4 OR 5 GHz Set router to only use a OR g OR n Set router to use AES encryption only Turned off power management on the adapter Set regulatory region to the correct value (NL) on both router and laptop Disable ipv6 Nothing seems to help, the slowdown always occurs. I did notice that the latency (ping google.com) stays roughly the same (around 9ms). Below is some more information that might be of use. $ lspci -nnk | grep -iA2 net 02:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01) Subsystem: Apple Inc. Device [106b:00e9] Kernel driver in use: bcma-pci-bridge $ rfkill list 0: hci0: Bluetooth Soft blocked: no Hard blocked: no 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no $ lsmod Module Size Used by dm_crypt 22820 1 arc4 12615 2 brcmsmac 550698 0 coretemp 13355 0 kvm_intel 132891 0 parport_pc 28152 0 kvm 443165 1 kvm_intel ppdev 17073 0 cordic 12574 1 brcmsmac brcmutil 14755 1 brcmsmac mac80211 606457 1 brcmsmac cfg80211 510937 2 brcmsmac,mac80211 bnep 18036 2 rfcomm 42641 12 joydev 17377 0 applesmc 19353 0 input_polldev 13896 1 applesmc snd_hda_codec_hdmi 36913 1 microcode 22881 0 snd_hda_codec_cirrus 23829 1 nls_iso8859_1 12713 1 uvcvideo 80847 0 btusb 22474 0 snd_hda_intel 39619 3 videobuf2_vmalloc 13056 1 uvcvideo snd_hda_codec 136453 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_cirrus bcm5974 17347 0 bluetooth 228619 22 bnep,btusb,rfcomm snd_hwdep 13602 1 snd_hda_codec lpc_ich 17061 0 videobuf2_memops 13202 1 videobuf2_vmalloc videobuf2_core 40513 1 uvcvideo videodev 129260 2 uvcvideo,videobuf2_core bcma 41051 1 brcmsmac snd_pcm 97451 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel snd_page_alloc 18710 2 snd_pcm,snd_hda_intel snd_seq_midi 13324 0 snd_seq_midi_event 14899 1 snd_seq_midi snd_rawmidi 30180 1 snd_seq_midi snd_seq 61554 2 snd_seq_midi_event,snd_seq_midi snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi snd_timer 29425 2 snd_pcm,snd_seq snd 68876 16 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_hda_codec_cirrus mei 41158 0 soundcore 12680 1 snd apple_bl 13673 0 mac_hid 13205 0 lp 17759 0 parport 46345 3 lp,ppdev,parport_pc usb_storage 57204 0 hid_apple 13237 0 hid_generic 12540 0 ghash_clmulni_intel 13259 0 aesni_intel 55399 399 aes_x86_64 17255 1 aesni_intel xts 12885 1 aesni_intel lrw 13257 1 aesni_intel gf128mul 14951 2 lrw,xts ablk_helper 13597 1 aesni_intel cryptd 20373 4 ghash_clmulni_intel,aesni_intel,ablk_helper i915 600351 3 ahci 25731 3 libahci 31364 1 ahci video 19390 1 i915 i2c_algo_bit 13413 1 i915 drm_kms_helper 49394 1 i915 usbhid 47074 0 drm 286313 4 i915,drm_kms_helper hid 101002 3 hid_generic,usbhid,hid_apple $ dmesg | egrep 'b43|bcma|brcm|[F]irm' [ 0.055025] [Firmware Bug]: ioapic 2 has no mapping iommu, interrupt remapping will be disabled [ 0.152336] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored [ 2.187681] pci_root PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-99] only partially covers this bridge [ 12.553600] bcma-pci-bridge 0000:02:00.0: enabling device (0000 -> 0002) [ 12.553657] bcma: bus0: Found chip with id 0xA8D8, rev 0x01 and package 0x08 [ 12.553688] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0) [ 12.553715] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0) [ 12.553764] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0) [ 12.605777] bcma: bus0: Bus registered [ 12.852925] brcmsmac bcma0:0: mfg 4bf core 812 rev 23 class 0 irq 17 [ 13.085176] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: false (implement) [ 13.085186] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement) [ 20.862617] brcmsmac bcma0:0: brcmsmac: brcms_ops_bss_info_changed: associated [ 20.862622] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 0 (implement) [ 20.862625] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: true (implement) [ 20.897957] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement) $ iwconfig lo no wireless extensions. wlan0 IEEE 802.11abgn ESSID:"wlan" Mode:Managed Frequency:5.22 GHz Access Point: E0:46:9A:4E:63:9A Bit Rate=65 Mb/s Tx-Power=17 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=63/70 Signal level=-47 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:13 Invalid misc:56 Missed beacon:0

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• Why apcupsd won't see the UPS connected to the USB posrt on FreeBSD 8.0 amd64

  - by Max Kosyakov

  Hello, Recently I installed an apcusbd on a FreeBSD 8.0 amd64 box via ports system. It installed perfectly but it won't run. Here what is says in the log: FATAL ERROR in generic-usb.c at line 636 Cannot find UPS device It appeared that HID driver picked the /dev/ugen4.2 which could cause the apcusb being unable to find the device. After I had discovered this, I rebuilt the kernel and removed the hid driver. Now it just shows "ugen4.2: <Tripp Lite> at usbus4" and no uhid0 device appears. Nevertheless the problem persisted. I tried to leave the DEVICE config setting blank --- won't help. Then I specified the particular device in the config, but it did not help either. Below you is the output of several commands that can provide some useful information on my case. server# /usr/local/etc/rc.d/apcupsd start Starting apcupsd. server# tail /var/log/messages | grep apcupsd Jun 17 22:30:00 server apcupsd[1520]: apcupsd FATAL ERROR in generic-usb.c at line 636 Cannot find UPS device -- For a link to detailed USB trouble shooting information, please see . Jun 17 22:30:00 server apcupsd[1520]: apcupsd error shutdown completed server# cat /usr/local/etc/apcupsd/apcupsd.conf ## apcupsd.conf v1.1 ## UPSCABLE usb UPSTYPE usb DEVICE /dev/ugen4.2 LOCKFILE /var/lock UPSCLASS standalone UPSMODE disable server# dmesg | grep '^u' uhci0: port 0xa800-0xa81f irq 16 at device 26.0 on pci0 uhci0: [ITHREAD] uhci0: LegSup = 0x0f00 usbus0: on uhci0 uhci1: port 0xa880-0xa89f irq 21 at device 26.1 on pci0 uhci1: [ITHREAD] uhci1: LegSup = 0x0f00 usbus1: on uhci1 uhci2: port 0xac00-0xac1f irq 18 at device 26.2 on pci0 uhci2: [ITHREAD] uhci2: LegSup = 0x0f00 usbus2: on uhci2 usbus3: EHCI version 1.0 usbus3: on ehci0 uhci3: port 0xa080-0xa09f irq 23 at device 29.0 on pci0 uhci3: [ITHREAD] uhci3: LegSup = 0x0f00 usbus4: on uhci3 uhci4: port 0xa400-0xa41f irq 19 at device 29.1 on pci0 uhci4: [ITHREAD] uhci4: LegSup = 0x0f00 usbus5: on uhci4 uhci5: port 0xa480-0xa49f irq 18 at device 29.2 on pci0 uhci5: [ITHREAD] uhci5: LegSup = 0x0f00 usbus6: on uhci5 usbus7: EHCI version 1.0 usbus7: on ehci1 uart0: port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0 uart0: [FILTER] usbus0: 12Mbps Full Speed USB v1.0 usbus1: 12Mbps Full Speed USB v1.0 usbus2: 12Mbps Full Speed USB v1.0 usbus3: 480Mbps High Speed USB v2.0 usbus4: 12Mbps Full Speed USB v1.0 usbus5: 12Mbps Full Speed USB v1.0 usbus6: 12Mbps Full Speed USB v1.0 usbus7: 480Mbps High Speed USB v2.0 ugen0.1: at usbus0 uhub0: on usbus0 ugen1.1: at usbus1 uhub1: on usbus1 ugen2.1: at usbus2 uhub2: on usbus2 ugen3.1: at usbus3 uhub3: on usbus3 ugen4.1: at usbus4 uhub4: on usbus4 ugen5.1: at usbus5 uhub5: on usbus5 ugen6.1: at usbus6 uhub6: on usbus6 ugen7.1: at usbus7 uhub7: on usbus7 uhub0: 2 ports with 2 removable, self powered uhub1: 2 ports with 2 removable, self powered uhub2: 2 ports with 2 removable, self powered uhub4: 2 ports with 2 removable, self powered uhub5: 2 ports with 2 removable, self powered uhub6: 2 ports with 2 removable, self powered uhub3: 6 ports with 6 removable, self powered uhub7: 6 ports with 6 removable, self powered ugen4.2: at usbus4 server#

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• Unexpected start of already-primary server processes when heartbeat on secondary is stopped.

  - by vorik

  Hi, I've got an active-passive Heartbeat cluster with Apache, MySQL, ActiveMQ and DRBD. Today, I wanted to perform hardware-maintenance on the secondary node (node04), so I stopped the heartbeat service before shutting it down. Then, the primary node (node03) received a shutdown notice from the secondary node (node04). This logging comes from the primary node: node03 heartbeat[4458]: 2010/03/08_08:52:56 info: Received shutdown notice from 'node04.companydomain.nl'. heartbeat[4458]: 2010/03/08_08:52:56 info: Resources being acquired from node04.companydomain.nl. harc[27522]: 2010/03/08_08:52:56 info: Running /etc/ha.d/rc.d/status status heartbeat[27523]: 2010/03/08_08:52:56 info: Local Resource acquisition completed. mach_down[27567]: 2010/03/08_08:52:56 info: /usr/share/heartbeat/mach_down: nice_failback: foreign resources acquired mach_down[27567]: 2010/03/08_08:52:56 info: mach_down takeover complete for node node04.companydomain.nl. heartbeat[4458]: 2010/03/08_08:52:56 info: mach_down takeover complete. harc[27620]: 2010/03/08_08:52:56 info: Running /etc/ha.d/rc.d/ip-request-resp ip-request-resp ip-request-resp[27620]: 2010/03/08_08:52:56 received ip-request-resp drbddisk OK yes ResourceManager[27645]: 2010/03/08_08:52:56 info: Acquiring resource group: node03.companydomain.nl drbddisk Filesystem::/dev/drbd0::/data::ext3 mysql apache::/etc/httpd/conf/httpd.conf LVSSyncDaemonSwap::master monitor activemq tivoli-cluster MailTo::[email protected]::DRBDFailureDrisAcc MailTo::[email protected]::DRBDFailureDrisAcc 1.2.3.212 ResourceManager[27645]: 2010/03/08_08:52:56 info: Running /etc/ha.d/resource.d/drbddisk start Filesystem[27700]: 2010/03/08_08:52:57 INFO: Running OK ResourceManager[27645]: 2010/03/08_08:52:57 info: Running /etc/ha.d/resource.d/mysql start mysql[27783]: 2010/03/08_08:52:57 Starting MySQL[ OK ] apache[27853]: 2010/03/08_08:52:57 INFO: Running OK ResourceManager[27645]: 2010/03/08_08:52:57 info: Running /etc/ha.d/resource.d/monitor start monitor[28160]: 2010/03/08_08:52:58 ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/activemq start activemq[28210]: 2010/03/08_08:52:58 Starting ActiveMQ Broker... ActiveMQ Broker is already running. ResourceManager[27645]: 2010/03/08_08:52:58 ERROR: Return code 1 from /etc/ha.d/resource.d/activemq ResourceManager[27645]: 2010/03/08_08:52:58 CRIT: Giving up resources due to failure of activemq ResourceManager[27645]: 2010/03/08_08:52:58 info: Releasing resource group: node03.companydomain.nl drbddisk Filesystem::/dev/drbd0::/data::ext3 mysql apache::/etc/httpd/conf/httpd.conf LVSSyncDaemonSwap::master monitor activemq tivoli-cluster MailTo::[email protected]::DRBDFailureDrisAcc MailTo::[email protected]::DRBDFailureDrisAcc 1.2.3.212 ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/IPaddr 1.2.3.212 stop IPaddr[28329]: 2010/03/08_08:52:58 INFO: ifconfig eth0:0 down IPaddr[28312]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/MailTo [email protected] DRBDFailureDrisAcc stop MailTo[28378]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/MailTo [email protected] DRBDFailureDrisAcc stop MailTo[28433]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/tivoli-cluster stop ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/activemq stop activemq[28503]: 2010/03/08_08:53:01 Stopping ActiveMQ Broker... Stopped ActiveMQ Broker. ResourceManager[27645]: 2010/03/08_08:53:01 info: Running /etc/ha.d/resource.d/monitor stop monitor[28681]: 2010/03/08_08:53:01 ResourceManager[27645]: 2010/03/08_08:53:01 info: Running /etc/ha.d/resource.d/LVSSyncDaemonSwap master stop LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncmaster down LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncbackup up LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncmaster released ResourceManager[27645]: 2010/03/08_08:53:02 info: Running /etc/ha.d/resource.d/apache /etc/httpd/conf/httpd.conf stop apache[28782]: 2010/03/08_08:53:03 INFO: Killing apache PID 18390 apache[28782]: 2010/03/08_08:53:03 INFO: apache stopped. apache[28771]: 2010/03/08_08:53:03 INFO: Success ResourceManager[27645]: 2010/03/08_08:53:03 info: Running /etc/ha.d/resource.d/mysql stop mysql[28851]: 2010/03/08_08:53:24 Shutting down MySQL.....................[ OK ] ResourceManager[27645]: 2010/03/08_08:53:24 info: Running /etc/ha.d/resource.d/Filesystem /dev/drbd0 /data ext3 stop Filesystem[29010]: 2010/03/08_08:53:25 INFO: Running stop for /dev/drbd0 on /data Filesystem[29010]: 2010/03/08_08:53:25 INFO: Trying to unmount /data Filesystem[29010]: 2010/03/08_08:53:25 ERROR: Couldn't unmount /data; trying cleanup with SIGTERM Filesystem[29010]: 2010/03/08_08:53:25 INFO: Some processes on /data were signalled Filesystem[29010]: 2010/03/08_08:53:27 INFO: unmounted /data successfully Filesystem[28999]: 2010/03/08_08:53:27 INFO: Success ResourceManager[27645]: 2010/03/08_08:53:27 info: Running /etc/ha.d/resource.d/drbddisk stop heartbeat[4458]: 2010/03/08_08:53:29 WARN: node node04.companydomain.nl: is dead heartbeat[4458]: 2010/03/08_08:53:29 info: Dead node node04.companydomain.nl gave up resources. heartbeat[4458]: 2010/03/08_08:53:29 info: Link node04.companydomain.nl:eth0 dead. heartbeat[4458]: 2010/03/08_08:53:29 info: Link node04.companydomain.nl:eth1 dead. hb_standby[29193]: 2010/03/08_08:53:57 Going standby [foreign]. heartbeat[4458]: 2010/03/08_08:53:57 info: node03.companydomain.nl wants to go standby [foreign] Soo... What just happened here??? Heartbeat on node04 stopped and told node03, which was the active node at the time. Somehow, node03 decided to start the cluster processes that were already running. (For the processes that are not critical, I always return a 0 from the startupscript so it does not stops the entire cluster when a non-essential part fails.) When starting ActiveMQ, it returns status 1 because it is already running. This fails the node and shuts everything down. As heartbeat is not running on the secondary node, it cannot failover to there. When I tried to run ha_takeover to restart the resources, absolutely nothing happened. Only after I restarted heartbeat on the primary node the resources could be started (after a delay of 2 minutes). These are my questions: Why does heartbeat on the primary node try to start the cluster processes again? Why did ha_takeover not work? What can I do to prevent this from happening? Server configuration: DRBD: version: 8.3.7 (api:88/proto:86-91) GIT-hash: ea9e28dbff98e331a62bcbcc63a6135808fe2917 build by [email protected], 2010-01-20 09:14:48 0: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate B r---- ns:0 nr:6459432 dw:6459432 dr:0 al:0 bm:301 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0 uname -a Linux node04 2.6.18-164.11.1.el5 #1 SMP Wed Jan 6 13:26:04 EST 2010 x86_64 x86_64 x86_64 GNU/Linux haresources node03.companydomain.nl \ drbddisk \ Filesystem::/dev/drbd0::/data::ext3 \ mysql \ apache::/etc/httpd/conf/httpd.conf \ LVSSyncDaemonSwap::master \ monitor \ activemq \ tivoli-cluster \ MailTo::[email protected]::DRBDFailureDrisAcc \ MailTo::[email protected]::DRBDFailureDrisAcc \ 1.2.3.212 ha.cf debugfile /var/log/ha-debug logfile /var/log/ha-log keepalive 500ms deadtime 30 warntime 10 initdead 120 udpport 694 mcast eth0 225.0.0.3 694 1 0 mcast eth1 225.0.0.4 694 1 0 auto_failback off node node03.companydomain.nl node node04.companydomain.nl respawn hacluster /usr/lib64/heartbeat/dopd apiauth dopd gid=haclient uid=hacluster Thank you very much in advance, Ger Apeldoorn

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• USB flash drive serial number specification

  - by clyfe

  I retrieve a USB flash drive serial number by means of ioctl HDIO_GET_IDENTITY as described here. Yet, for some flash drives there is no serial (for example my SanDisk Cruzer). Why some drives don not return a serial number? a) HDIO_GET_IDENTITY not implemented in driver ? b) They just don't have one ? c) Other ? (what?) Is there a specification (like IEEE) that describes where and how the serial number is stored inside the flash drive?

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• How to Create a Virtual Windows Drive

  - by HyLian

  Hello, I'm trying to create a Windows Virtual Drive ( like c:\ ) to map a remote storage. The main purpose is to do it in a clear way to the user. Therefore the user wouldn't know that he is writing/reading from another site. I was searching for available products, and i find that FUSE is not an option in Windows and WebDAV maps directly the drive, and i would like to build a middle layer between windows and remote storage to implement some kind of services. Another alternatives exists, such as Dokan, that is very expensive, and System.IO.IsolatedStorage Namespace, that doesn't seem to explicity create a new Windows Drive. Probably pismo ( http://www.pismotechnic.com/ ) is the thing that mostly matches my requirements but I would know if there is another alternative, including some Windows ( C++ or .NET ) native API to do that. Thanks for reading :)

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• osx split external hard drive partition

  - by Bart

  Hi, I currently have a 640GB external HD that has 1 partition formatted as HSF+ Now I want to split some of the free space into a new FAT32 partition, without having to reformat the whole HD and losing all my data. I read that I'm supposed to be able to add new partitions in the Hard Disc Utility by clicking the "+" sign, without any loss of data. But in my case the "+" is not clickable and it says that this partition cannot be altered. Can anyone tell me how to proceed. Or is it impossible without reformatting the whole disc? Thanks ps: I'm running osx snow leopard 10.6.6

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• Windows Clients: Windows or Linux Domain Controller?

  - by Ramon Marco Navarro

  I'm planning to set up a domain controller for our small computer laboratory. I'm a little confused as to what operating system to use for our domain controller. What's in the lab: The lab has 25 units running a mix of Windows 7 and Windows XP. The domain controller will only have 2GB of RAM running a C2D E7200. (Is this enough?) What we want: The Domain Controller will also be running a git server. The Domain Controller will also be used as a general development machine (mostly Java, PHP). A way to centralize the updates for the windows clients, so that they won't have to download the same patches from the remote site. The machines would just query them from the local domain controller and get the updates from there. Our head recommended that I virtualize a Windows Server 2008 system under a Linux host and use the former as a domain controller and the latter for development or the other way around. A comparison of the advantages and disadvantages of using a Linux distribution or Windows Server 2008 in this situation would also be appreciated. As you may have noticed by now, I'm kinda new to setting up a domain so I hope you guys will be able to help me. Thank you.

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• Windows or Linux for VPN-VPN Bridge

  - by James

  I have the following network layout: Network1 ----VPN1-----Network2----VPN2----Network3 I can administer everything in Network1 only and my goal is to get to a box on Network3. I've been told by the admins of Network2 that it's not possible for them to route traffic from Network1 to Network3. I've finally been authorised to host a box in Network2 and I'm hoping with this I can set something up to resolve the issue. My question is should I set this up as a Windows or a Linux box. My initial thought was to use iptables to reroute requests but with my lack of experience with Windows Server (used for something or other in Network2) I'm not sure if this will work. My head's full of questions like: - can I get an ip without logging in to a windows domain? - if I do get an ip, do Windows Servers manage routing through the VPN? - can I make a linux box authenticate with Windows Server to log on to the domain? - would it just be easier to set up a windows box? - is it possible to configure a windows box to do routing from Network1 to Network3? Has anyone done anything like this before? Had experience managing Windows Server? Authenticated (or not as the case may be) to a Windows domain? I'd really appreciate your advice. It might be worth mentioning that the overall objective is to establish a telnet connection from a box on Network1 to a box on Network3.

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• VMWare Converter - Remote Linux Install P2V

  - by Zed Said

  I am trying to get what I thought was an easy process working. Here is my situation. I have a remote linux server (running Debian) that I would like to turn into a VM so that I can do testing on it rather than the production server. I downloaded VMWare Converter. I went to the "convert machine" wizard, chose Powered-on machine, entered my remote machine details. Clicking next shows that it correctly connects to my remote linux box. Now, on the next screen, for Destination type, it enters "WMWare Infrastructure virtual machine", and I can't change this. This is where I am stuck. Why do I need another sever to convert with? Is this where my VM gets sent to? And why can't I just convert the VM and save it on the computer that I am running the converter program on? If I do have to use a vmware infrastructure destination, I am confused at what ESX is, why and how I use it. Any help with this process would be more than appreciated!

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• How can a CentOS 6 guest running in VirtualBox be configured as a LAMP server that can be accessed from the Windows host?

  - by jtt89

  I was able to conect Centos6 on Virtual Box to Windows (I can ping in both directions) with Host-only Adapter (for connection between the two) and NAT Adapter (to enable Linux on VB to connect to the Internet). I want to set up httpd, mysql and vsftpd servers and in the end easily connect to httpd from Windows based browser and ftp server with a Windows based client as well. I would also want to have access through SSH. I have a general idea of the steps that are involved, but there is also a configuration that I am not sure about at this point. Lets say I follow these steps: yum install httpd yum install php php-pear php-mysql yum install mysql-server mysql_secure_installation yum install vsftpd yum install mod_ssl Technically I have everything installed, but what would be the next steps that I need to take (from the networking point of view, so to speak) to get it all working)? I know I need to configure, at least Apache, and ftp server, but I am not sure how is it gonna work; like where am I gonna be uloading the sites (I know this can vary), how am I gonna know what address to use in a browser if I wanna go to a website x, y, z on that installation etc. This sounds like I need to do some kind of DNS setup and I am kind of stuck at this point. If somebody could give me a general outline of what are the things that need to be done that would be great (I was looking at a lot of websites and I know about etc/sysconfig/network, httpd.config - not too much about it on Apache's site, hostname, hostname -f etc; but it is kind of hard to piece it all together at this point). I am gonna be looking at the books also, but they not always reflect the setup that I have too (VirtualBox). Thank you.

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• Linux can't find file that exists

  - by Joe

  I'm trying to get Google's Dart language up and running, but it errors when running dart2js. I'm running Arch linux and I installed dart-sdk from AUR. Some relevant terminal output lies below. % dart2js main.dart /usr/local/bin/dart2js: line 7: /usr/local/bin/dart: No such file or directory % cat /usr/local/bin/dart2js #!/bin/sh # Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file # for details. All rights reserved. Use of this source code is governed by a # BSD-style license that can be found in the LICENSE file. BIN_DIR=`dirname $0` exec $BIN_DIR/dart --allow_string_plus=false $BIN_DIR/../lib/dart2js/lib/compiler/implementation/dart2js.dart "$@" % file /usr/local/bin/dart /usr/local/bin/dart: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, BuildID[sha1]=0x27fe166ca015c1adfeaf3a6f9c018e7d7af46d9f, stripped % ls -alh /usr/local/bin total 4.9M drwxr-xr-x 2 root root 4.0K Jun 10 22:51 . drwxr-xr-x 12 root root 4.0K Jun 10 22:51 .. -rwxr-xr-x 1 root root 422K May 10 22:41 cargo -rwxr-xr-x 1 root root 2.7M Jun 10 22:50 dart -rwxr-xr-x 1 root root 360 Jun 6 16:20 dart2js -rwxr-xr-x 1 root root 176 Jun 6 16:20 pub -rwxr-xr-x 1 root root 166K May 10 22:41 rustc -rwxr-xr-x 1 root root 1.6M May 10 22:41 rustdoc % uname -rm 3.3.7-1-ARCH x86_64 Could it be because I'm running a 64bit OS and the dart binary is 32bit?

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• security concerns in dual-boot Linux, Windows system?

  - by Brian

  I plan to install Windows Vista on my second hard drive partition, with Ubuntu Hardy remaining on the first partition. How likely is it that any security holes that may exist in Vista could allow malicious code to find its way to the Ubuntu partition or otherwise damage the system?

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• Resize Debian in VirtualBox

  - by Poni

  I have a VM with one HD of size 3GB and I'd like to enlarge its HD to 7GB. So I execute this command on the host (while guest is shutdown): VBoxManage modifyhd debian.vdi --resize 7168 Then I run the guest, Debian 6, and then: smith@debian6:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 2.8G 2.6G 60M 98% / tmpfs 61M 0 61M 0% /lib/init/rw udev 57M 160K 57M 1% /dev tmpfs 61M 0 61M 0% /dev/shm smith@debian6:~$ sudo parted /dev/sda print Model: ATA VBOX HARDDISK (scsi) Disk /dev/sda: 3221MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 3035MB 3034MB primary ext3 boot 2 3036MB 3220MB 185MB extended 5 3036MB 3220MB 185MB logical linux-swap(v1) smith@debian6:~$ cat /proc/partitions major minor #blocks name 8 0 3145728 sda 8 1 2962432 sda1 8 2 1 sda2 8 5 180224 sda5 So, no automatic resizing (detection) of the HD/partition (while VirtualBox, in the host, shows it's 7GB now). Ok... Then I do: smith@debian6:~$ sudo resize2fs /dev/sda1 resize2fs 1.41.12 (17-May-2010) The filesystem is already 740608 blocks long. Nothing to do! smith@debian6:~$ sudo parted GNU Parted 2.3 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) select /dev/sda1 Using /dev/sda1 (parted) resize WARNING: you are attempting to use parted to operate on (resize) a file system. parted's file system manipulation code is not as robust as what you'll find in dedicated, file-system-specific packages like e2fsprogs. We recommend you use parted only to manipulate partition tables, whenever possible. Support for performing most operations on most types of file systems will be removed in an upcoming release. Partition number? 1 Start? 0 End? [3034MB]? Here I'm stuck. At the above parted it asks me to resize to 3GB. No point in that, right.. What should I do in order to enlarge this partition?

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