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  • When pointing to new DNS servers is there any chance of E-mails being lost if the old E-mail hosting service is still up?

    - by LaserBeak
    I am changing webhosts and will be using the new hosts mail servers instead of the old ones. I have created all the correctly named mailboxes on the new service but have also not yet cut ties with the old webhost. I am expecting that even if the new DNS values which point to the new hosts DNS servers and respective SOA\zone file with the new MX values have not yet propagated and an E-mail is directed at the old hosts mail servers as per the mx records in the SOA\zone records which the old hosting provider holds, the E-mail would still come through to the mailbox that's on the old host providers mail servers. So I am just trying to reaffirm if I got this right and it's essentially impossible for me to loose an E-mail since it will hit either the old hosts mail servers or the new ones ? Also is it possible to configure the same E-mail account to check and collect mail from different mail servers by entering multiple pop3 addresses ? And if I choose to keep the old web hosts mail hosting services as a backup by specifying the mx records for it with a lower priority in the SOA records hosted by the new webhost, is it possible to have any incoming E-mails sent to both servers by the mail daemon so I have two copies? Or is my only option having the primary mail server forward the E-mail somehow to the old mailserver ?

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  • Wifi installation issues on Ubuntu 10.10

    - by SlyrNemesis
    Linux newbie here, anyway so here is the problem, I run Ubuntu 10.10 and I have a Sitecom 300N x2 Wireless Network dongle with chipset 8192SU, I used ndiswrapper to install my Windows Wireless driver because Sitecom doesn't have a linux driver, it says hardware present but it doesn't find any Wireless networks, nor does it connect to one. What can I do? The command "dmesg | grep ndis" gave this output in the terminal: [ 9.999954] ndiswrapper version 1.56 loaded (smp=yes, preempt=no) [ 11.111901] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateNetBufferAndNetBufferList' [ 11.111973] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMIndicateReceiveNetBufferLists' [ 11.112099] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMRegisterMiniportDriver' [ 11.112161] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateMdl' [ 11.112220] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMDeregisterMiniportDriver' [ 11.112280] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeNetBufferListPool' [ 11.112339] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateNetBufferListPool' [ 11.112399] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeMdl' [ 11.112457] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMAllocatePort' [ 11.112515] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMNetPnPEvent' [ 11.112573] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMFreePort' [ 11.112631] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMSendNetBufferListsComplete' [ 11.112780] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMSetMiniportAttributes' [ 11.112848] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisOpenConfigurationEx' [ 11.112946] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMIndicateStatusEx' [ 11.113017] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMOidRequestComplete' [ 11.113112] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateMemoryWithTagPriority' [ 11.113200] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateIoWorkItem' [ 11.113271] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeIoWorkItem' [ 11.113342] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisQueueIoWorkItem' [ 11.113413] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeNetBufferList' [ 11.113481] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionBind' [ 11.113547] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionBindClass' [ 11.113613] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionUnbindClass' [ 11.113680] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionUnbind' [ 11.113742] ndiswrapper (load_sys_files:206): couldn't prepare driver 'net8192su' [ 11.148888] ndiswrapper (load_wrap_driver:108): couldn't load driver net8192su; check system log for messages from 'loadndisdriver' [ 11.365200] usbcore: registered new interface driver ndiswrapper [ 12.818573] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.819183] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.819796] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.820505] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.821115] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.821726] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.822339] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.822948] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.823560] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.824204] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy

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  • Wifi installation issues with a Sitecom 300N x2 Wireless Network dongle

    - by SlyrNemesis
    Linux newbie here, anyway so here is the problem, I run Ubuntu 10.10 and I have a Sitecom 300N x2 Wireless Network dongle with chipset 8192SU, I used ndiswrapper to install my Windows Wireless driver because Sitecom doesn't have a linux driver, it says hardware present but it doesn't find any Wireless networks, nor does it connect to one. What can I do? The command "dmesg | grep ndis" gave this output in the terminal: [ 9.999954] ndiswrapper version 1.56 loaded (smp=yes, preempt=no) [ 11.111901] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateNetBufferAndNetBufferList' [ 11.111973] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMIndicateReceiveNetBufferLists' [ 11.112099] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMRegisterMiniportDriver' [ 11.112161] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateMdl' [ 11.112220] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMDeregisterMiniportDriver' [ 11.112280] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeNetBufferListPool' [ 11.112339] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateNetBufferListPool' [ 11.112399] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeMdl' [ 11.112457] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMAllocatePort' [ 11.112515] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMNetPnPEvent' [ 11.112573] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMFreePort' [ 11.112631] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMSendNetBufferListsComplete' [ 11.112780] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMSetMiniportAttributes' [ 11.112848] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisOpenConfigurationEx' [ 11.112946] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMIndicateStatusEx' [ 11.113017] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisMOidRequestComplete' [ 11.113112] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateMemoryWithTagPriority' [ 11.113200] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisAllocateIoWorkItem' [ 11.113271] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeIoWorkItem' [ 11.113342] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisQueueIoWorkItem' [ 11.113413] ndiswrapper (import:233): unknown symbol: NDIS.SYS:'NdisFreeNetBufferList' [ 11.113481] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionBind' [ 11.113547] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionBindClass' [ 11.113613] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionUnbindClass' [ 11.113680] ndiswrapper (import:233): unknown symbol: WDFLDR.SYS:'WdfVersionUnbind' [ 11.113742] ndiswrapper (load_sys_files:206): couldn't prepare driver 'net8192su' [ 11.148888] ndiswrapper (load_wrap_driver:108): couldn't load driver net8192su; check system log for messages from 'loadndisdriver' [ 11.365200] usbcore: registered new interface driver ndiswrapper [ 12.818573] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.819183] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.819796] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.820505] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.821115] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.821726] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.822339] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.822948] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.823560] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy [ 12.824204] Modules linked in: snd_wavefront snd_emu10k1(+) snd_cs4236 snd_usb_audio snd_wss_lib snd_opl3_lib snd_ac97_codec ac97_bus nouveau(+) snd_pcm i915 snd_usbmidi_lib snd_util_mem snd_page_alloc snd_hwdep snd_mpu401 snd_mpu401_uart snd_seq_midi snd_rawmidi ttm snd_seq_midi_event drm_kms_helper snd_seq ppdev snd_timer snd_seq_device drm ndiswrapper snd parport_pc emu10k1_gp intel_agp ns558 gameport soundcore i2c_algo_bit shpchp lp video output agpgart parport usbhid hid 8139too 8139cp mii floppy

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  • How do web servers enforce the same-origin policy?

    - by BBnyc
    I'm diving deeper into developing RESTful APIs and have so far worked with a few different frameworks to achieve this. Of course I've run into the same-origin policy, and now I'm wondering how web servers (rather than web browsers) enforce it. From what I understand, some enforcing seems to happen on the browser's end (e.g., honoring a Access-Control-Allow-Origin header received from a server). But what about the server? For example, let's say a web server is hosting a Javascript web app that accesses an API, also hosted on that server. I assume that server would enforce the same-origin policy --- so that only the javascript that is hosted on that server would be allowed to access the API. This would prevent someone else from writing a javascript client for that API and hosting it on another site, right? So how would a web server be able to stop a malicious client that would try to make AJAX requests to its api endpoints while claiming to be running javascript that originated from that same web server? What's the way most popular servers (Apache, nginx) protect against this kind of attack? Or is my understanding of this somehow off the mark? Or is the cross-origin policy only enforced on the client end?

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  • How do I move a linked file on Unix?

    - by r3mbol
    I have a bunch of files in one directory and links to each one of those files in another directory. So ls -l looks something like this: lrwxrwxrwx 1 rembol rembol 89 Jan 25 10:00 copyright.txt -> /home/rembol/solr/target/deploy/data/core/copyright.txt lrwxrwxrwx 1 rembol rembol 92 Jan 25 10:00 jar-versions.xml -> /home/rembol/solr/target/deploy/data/core/jar-versions.xml lrwxrwxrwx 1 rembol rembol 85 Jan 25 10:00 lgpl.html -> /home/rembol/solr/target/deploy/data/core/lgpl.html lrwxrwxrwx 1 rembol rembol 79 Jan 25 10:00 lib -> /home/rembol/solr/target/deploy/data/core/lib lrwxrwxrwx 1 rembol rembol 87 Jan 25 10:00 readme.html -> /home/rembol/solr/target/deploy/data/core/readme.html drwxr-xr-x 3 rembol rembol 4096 Jan 25 10:00 server drwxr-xr-x 2 rembol rembol 4096 Jan 25 10:00 startup Now I want to move those linked files from /home/rembol/solr/target/deploy to /home/rembol/output/. If I do that my simply calling mv, links will break. I don't want to re-link each file separately, cause there are hundreds of them (they are generated automatically). Is there some clever way to move linked files, rather than writing a script that unlinks, moves and relinks recursively for each file in each subdirectory?

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  • Nagios3: Conditional operators for service checks?

    - by Dave
    I'm trying to setup Nagios to monitor my various using hostgroups to define 'machine roles', against which I run services to check the machines by role. However, I'd like to use conditional operators that would enable me to run the service check against an intersection of two host groups, rather than their unions... i.e. using &&, ||, or () operators. For example, imagine I have the following servers: www-eu: Linux WWW (Apache) server, in the EU www-us: Windows WWW (IIS) server, in the US (West coast) ftp-eu: Linux FTP server, in the EU ftp-us: Windows FTP server, in the US I would want to create the following host groups: US-Servers: www-us, ftp-us EU-Servers: www-eu, ftp-eu WWW-Servers: www-us, www-eu FTP-Servers: ftp-us, ftp-eu Now say I'm interested in checking the HTTP response time for my web servers. Then let's say this particular Nagios service is running from the US (West Coast), and that I have a command called *check_http_response_time*. This command will check the responsiveness of the HTTP server, which I can provide an argument which defines the max response time before raising critical. My command might look like: check_http_response_time $HOSTNAME$ 50 Now traditionally, I can run my checks by specifying a list of host or hostgroups. define service{ use local-service hostgroup_name WWW-Servers # Servers = www-us, www-eu servicegroups WWW Checks service_description Check HTTP Response Time check_command check_http_response_time!50 } However, with the above service definition, given my Nagios service is in US West, I could reasonably expect that my EU server will return critical. Really, I want different thresholds for each region (50 for US West, 200 for EU.) I would have to permutate my service for each host and set their custom threshold, or alternatively permutate out my service groups by role & region (i.e. WWW-Servers-EU), and run my specific thresholds against those. Though the latter is better, both are much messier than I'd like... What I would love, and what this post is asking for, is a way to use hostgroups to perform an intersection using conditional logic, rather than a simple union. It might look like: define service{ use local-service hostgroup_name WWW-Servers && US-Servers servicegroups WWW Checks service_description Check HTTP Response Time check_command check_http_response_time!50 } It then would run the check only against servers that are in both WWW-Servers and US-Servers, in my example, just www-us. The benefits of such a feature would be significant for Nagios services configured for large-scale. Is this feature available? If it isn't, will it be available in the future? Is there an alternative way to accomplish this given the most recent Nagios version? Any tips/suggestions are most appreciated! Dave

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  • How can I centralise MySQL data between 3 or more geographically separate servers?

    - by Andy Castles
    To explain the background to the question: We have a home-grown PHP application (for running online language-learning courses) running on a Linux server and using MySQL on localhost for saving user data (e.g. results of tests taken, marks of submitted work, time spent on different pages in the courses, etc). As we have students from different geographic locations we currently have 3 virtual servers hosted close to those locations (Spain, UK and Hong Kong) and users are added to the server closest to them (they access via different URLs, e.g. europe.domain.com, uk.domain.com and asia.domain.com). This works but is an administrative nightmare as we have to remember which server a particular user is on, and users can only connect to one server. We would like to somehow centralise the information so that all users are visible on any of the servers and users could connect to any of the 3 servers. The question is, what method should we use to implement this. It must be an issue that that lots of people have encountered but I haven't found anything conclusive after a fair bit of Googling around. The closest I have seen to solutions are: something like master-master replication, but I have read so many posts suggesting that this is not a good idea as things like auto_increment fields can break. circular replication, this sounded perfect but to quote from O'Reilly's High Performance MySQL, "In general, rings are brittle and best avoided" We're not against rewriting code in the application to make it work with whatever solution is required but I am not sure if replication is the correct thing to use. Thanks, Andy P.S. I should add that we experimented with writes to a central database and then using reads from a local database but the response time between the different servers for writing was pretty bad and it's also important that written data is available immediately for reading so if replication is too slow this could cause out-of-date data to be returned. Edit: I have been thinking about writing my own rudimentary replication script which would involve something like having each user given a server ID to say which is his "home server", e.g. users in asia would be marked as having the Hong Kong server as their own server. Then the replication scripts (which would be a PHP script set to run as a cron job reasonably frequently, e.g. every 15 minutes or so) would run independently on each of the servers in the system. They would go through the database and distribute any information about users with the "home server" set to the server that the script is running on to all of the other databases in the system. They would also need to suck new information which has been added to any of the other databases on the system where the "home server" flag is the server where the script is running. I would need to work out the details and build in the logic to deal with conflicts but I think it would be possible, however I wanted to make sure that there is not a correct solution for this already out there as it seems like it must be a problem that many people have already come across.

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  • Huge or minimal performance hit running game servers on a Virtual Machine? [closed]

    - by Damainman
    I have a two dedicated servers to choose from depending on which one would do a better job. I plan on updating the Hard Drive space and RAM at a later date depending on how I move forward. Server 1: 500GB Hard Drive 8GB RAM 2x 64bit Intel Xeon L5420(Quad Core) @ 2.50Ghz Server2: 500GB Hard Drive 8GB RAM 2x 64bit Intel Xeon E5420(Quad Core) @ 2.50GHz I want to run a virtual machine that will host about 10 game servers, with about 16 active slots per server. It will be a mix and match from: Minecraft Counter Strike( 1.6, Source, Global Offensive) Battlefield Team Fortress I know the general consensus is virtualization is a horrible idea if you plan on running virtual servers on them. The issue is, the discussions I read do not really clearly state whether they are speaking about a virtual server running inside an OS(ie: VMware Player running on Windows with the game server in a VM) or a Hypervisor such as Xen Cloud Platform. I am trying to get a definite answer on how feasible the above would be and how much of a performance hit it might be if the VM running the game servers is on a hypervisor such as Xen Cloud Platform. My initial research lead me to believe that there wouldn't be a performance hit since the virtualization is different than running it via inside of a OS.

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  • I have permanent connections to Canonical servers, what are they for?

    - by Dan Dman
    After the recent upgrade to 12, I notice permanent connections to canonical servers. Running netstat -tp gives: Foreign Address State PID/Program name mulberry.canonical:http CLOSE_WAIT 6537/ubuntu-geoip-p alkes.canonical.co:http CLOSE_WAIT 6667/python alkes.canonical.co:http CLOSE_WAIT 6667/python Why are there permanent connections and how could I stop this behavior? And if this is intentional, who is responsible? I would like to understand why this was done because to me it seems like a bad idea.

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  • How to remove duplicate content, which is still indexed, but not linked to anymore?

    - by David
    A bug in the tool, which we use to create search-engine-friendly URLs changed our whole URL-structure overnight, and we only noticed after Google already indexed the page. Now, we have a massive duplicate content issue, causing a harsh drop in rankings. Webmaster Tools shows over 1,000 duplicate title tags, so I don't think, Google understands what is going on. Right URL: abc.com/price/sharp-ah-l13-12000-btu.html Wrong URL: abc.com/item/sharp-l-series-ahl13-12000-btu.html (created by mistake) After that, we ... Changed back all URLs to the "Right URLs" Set up a 301-redirect for all "Wrong URLs" a few days later Now, still a massive amount of pages is in the index twice. As we do not link internally to the "Wrong URLs" anymore, I am not sure, if Google will re-crawl them very soon. What can we do to solve this issue and tell Google, that all the "Wrong URLs" now redirect to the "Right URLs"? Best, David

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  • I have permanent connections to Canonical servers, what are they for and how can I turn them off?

    - by Dan Dman
    After the recent upgrade to 12, I notice permanent connections to canonical servers. Running netstat -tp gives: Foreign Address State PID/Program name mulberry.canonical:http CLOSE_WAIT 6537/ubuntu-geoip-p alkes.canonical.co:http CLOSE_WAIT 6667/python alkes.canonical.co:http CLOSE_WAIT 6667/python Why are there permanent connections and how could I stop this behavior? And if this is intentional, who is responsible? I would like to understand why this was done because to me it seems like a bad idea.

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  • I want to add a Quality Assurance domain. How do I handle DNS servers?

    - by Tim
    I'm advising a large client on how to isolate their dev and testing from their production. They already have one domain, lets say xyz.net with the active directory domain as "XYZ01". I want to add second domain say QAxyz.net and make its active directory domain "QA01" All development and QA servers would be moved to the QAxyz.net domain, the machines would be part of the QA01 domain. Note: Some of these servers will have the same name as the production servers for testing purposes. I believe we would have separate DNS servers for each domain. If I am logged into the QA01 domain, to access the production domain I would qualify my access like so: \PRODSERVER.xyz.net login: XYZ01\username Do I need to add a forwarder to my QAxyz.net DNS server so that it can see xyz.net? Would I need to do the same to the xyz.net DNS server to see QAxyz.net? I don't know how to advise them in this. Does anyone have any other recommendations to isolationg a QA domain? Many Thanks in advance! Tim

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  • How does one make sure or even guarantee server time are sync correctly between dozens of servers across multiple datacenter on different location?

    - by forestclown
    Currently our web applications contain a logic to check if the data sent to the web server is expired or not by comparing the timestamp of the data with the date/time of the server. Everything goes will, until some dude from data center accidentally modify one of the web server date/time and causes some disruptions in our web services. My managers are of course not happy with this, and said we shouldn't use timestamp to check expiry in the first place...anyway.... Network Time Protocol is implemented, because of data centers are spread across different continents so we have one NTP server in each data center. The servers within the data center will have cron jobs to check against the time with their NTP server from the same data center. If time is out of sync it will auto update the server date/time. But then with our managers not happy with it, and think it could still easily causes the same problem. e.g. what if someone accidentally modify the NTP date/time? what if all the NTP servers are out of sync with each other? which NTP servers we can really trust? and blah blah.. So my questions are: What are the current practice to sync date/time between servers across multiple data centers or locations? How does one manages time stamp between web apps? e.g. Server A send data (contain timestamp of Server A) to Server B (compare timestamp between Server B and the timestamp from the data to see if it has expired or not. This is to avoid HTTP replay) Should we really not use timestamp check? Thanks & Best Regards

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  • Is a program linked against an LGPL library in linux still under GPL?

    - by Jonathan Henson
    If I were to write say, an embeded linux video server, how much of the code do I have to offer to someone who requests the source? Do I have to offer the code that directly links against the GPL covered code or do I have to offer all code? For instance, if I use gstreamer, or any other LGPL code, on a linux platform in my program, does all of my code become under GPL simply because somewhere in the chain, the LGPL program had to link agaist GPL code? I guess this is an extension of the question. Can you write a C library that compiles in linux that does not become subject to GPL?

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  • Are Java servers really more preferable for web-development? [closed]

    - by Gerald Goward
    Many experienced people I know tell me that many web-projects, including enterprise ones, are better to develop with Java being back-end. Reasons: Ubuntu servers being cheaper and more reliable. MySql being much more "light" rather than "heavyweighted" MS Sql. I heard some more, but I really cant remember all of them. My question: I believe ASP.NET and Java are BOTH good for web-development and its just holywar subject. Am I right or not?

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  • Why is the wrong name server information at crsnic.net & gtld-servers.net ?

    - by danorton
    Did I screw this up? I don’t even know how this might have happened, so I’d like to learn. I’m trying out HostGator’s reseller service and I bought a domain name through it, but I didn’t want the default name servers and so I changed them during the registration. After registration the domain name record is correct everywhere except at whois-servers.net and whois.crsnic.net and it looks like the DNS network is using that same information. $ whois -h whois.enom.com. example.com ... Name Servers: dns1.name-services.com dns2.name-services.com dns3.name-services.com dns4.name-services.com dns5.name-services.com ... $ whois -h whois.crsnic.net. example.com Domain Name: EXAMPLE.COM Registrar: ENOM, INC. Whois Server: whois.enom.com Referral URL: http://www.enom.com Name Server: NS1.HOSTGATOR.COM Name Server: NS2.HOSTGATOR.COM Status: clientTransferProhibited Updated Date: 01-jun-2010 Creation Date: 31-may-2010 Expiration Date: 31-may-2011 >>> Last update of whois database: Tue, 01 Jun 2010 19:20:47 UTC <<< ... $ dig +norecurse @b.gtld-servers.net. example.com. NS ... ;; AUTHORITY SECTION: example.com. 172763 IN NS ns2.hostgator.com. example.com. 172763 IN NS ns1.hostgator.com. ... My next step is to let HostGator have a look, but first I want to better understand how this happened. Thanks.

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  • do you still get a bounce in google analytics if all the linked pages/content is loaded dyanmicly?

    - by sam
    Google analytics describes a bounce as a user that visits and leaves before after their first page. But if your site is a one page site, with content loaded dynamicly using javascript you could have a user one your site go through loads of info, text images but would that still count as a bounce ? Or once they click on an a-tag even if it is <a href="#"> can google analytics see that ? (im aware of click tracking in analytics) but i was wandering if google picks up these clicks by default..

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  • If I create a link to a folder, how can I get from that linked folder to the "real" folder from within Nautilus?

    - by snowguy
    Say I have a folder several layers down in my documents folder. And I want easy access to it from my desktop. To do that I: Go to the parent folder in Nautilus. Right click on the folder's Icon and choose Make Link Cut / Paste the new "Link to ..." folder onto my desktop. Great. And mostly this works fine for me. But suppose I want to get to that folder's parent. I can of course get there using the original path--what Nautilus calls the "link path" which I can see in the properties of the folder. But that seems harder than it ought to be. How can I click on the folder and go to the link path directly?

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  • How often do you use data structures (ie Binary Trees, Linked Lists) in your jobs/side projects?

    - by Chris2021
    It seems to me that, for everyday use, more primitive data structures like arrays get the job done just as well as a binary tree would. My question is how common is to use these structures when writing code for projects at work or projects that you pursue in your free time? I understand the better insertion time/deletion time/sorting time for certain structures but would that really matter that much if you were working with a relatively small amount of data?

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  • What are the typical methods used to scale up/out email storage servers?

    - by nareshov
    Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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  • Why would you use data structures (ie Binary Trees, Linked Lists) in your jobs/side projects? [closed]

    - by Chris2021
    It seems to me that, for everyday use, more primitive data structures like arrays get the job done just as well as a binary tree would. My question is how common is to use these structures when writing code for projects at work or projects that you pursue in your free time? I understand the better insertion time/deletion time/sorting time for certain structures but would that really matter that much if you were working with a relatively small amount of data?

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  • Can I compile Passenger (mod_rails/mod_rack) to make a statically linked Apache httpd?

    - by Oleg
    I prefer to disable httpd dynamic module loading on my production server. I've been using mod_jk linked statically into httpd for quite a long time and it proved to be stable. Now I would like to add Ruby Passenger (mod_rails/mod_rack) to my httpd. I wonder if it is possible to link it statically into Apache httpd the same way too? (without producing a huge httpd) If it is, are there any potential pitfalls, safety or performance concerns having both mod_jk and mod_rails within the same executable? Thanks

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  • What kind of storage do people actually use for VMware ESX servers?

    - by Dirk Paessler
    VMware and many network evangelists try to tell you that sophisticated (=expensive) fiber SANs are the "only" storage option for VMware ESX and ESXi servers. Well, yes, of course. Using a SAN is fast, reliable and makes vMotion possible. Great. But: Can all ESX/ESXi users really afford SANs? My theory is that less than 20% of all VMware ESX installations on this planet actually use fiber or iSCS SANs. Most of these installation will be in larger companies who can afford this. I would predict that most VMware installations use "attached storage" (vmdks are stored on disks inside the server). Most of them run in SMEs and there are so many of them! We run two ESX 3.5 servers with attached storage and two ESX 4 servers with an iSCS san. And the "real live difference" between both is barely notable :-) Do you know of any official statistics for this question? What do you use as your storage medium?

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