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• Which database to use and system/db administration by layman [closed]

  - by blah

  So my friend and I got briliant ;) idea for a business. Since it is not predictable whether it will work out or not, we decided to keep cost as low as possible to start with, in particular not to hire anyone. If it will work out as expected it will generate enough profit to hire professionals in few months. But for the first few months we'll be doing everything by ourselfs. He's a business/finance major, and I'm a software developer, so obviously I have to take care of IT :) It will be a webapp, written in python/django. My questions regarding this project: 1) What database should I choose? I'm experienced with oracle, and have been working with SQL Server for a while, but both of them are too expensive(at least now). It's a developer experience, I've never done any dba stuff. I'm looking for something free(as in beer). Looks like MySql or PostgreSQL are most popular in this sector. I would appreciate any comments on which db to choose. I'm open to any suggestions(it doesn't have to be MySql or Postgre). Here's what I know about data: It will be almost dates and numbers, a little bit of text. Searched mainly by dates. Data will almost never be updated, mostly inserted and browsed. From 30k to 300k new records/month. 2) Servers. My idea is to rent two dedicated servers. During normal operation one would be a web server(debian/apache), other would be a db server(debian/?). My recovery plan is to install everything on both, and in case of trouble with one of machines just run everything on the other one. Does it even makes sense? Any other tips appreciated. Thanks.

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• Installation of gearmand fails on libevent dependency

  - by PeeHaa

  I've installed the PostgreSQL yum repo and have PostgreSQL running for some time now, but now when I try to install gearmand I get the following errors: Transaction Check Error: file /usr/bin/event_rpcgen.py from install of compat-libevent14-1.4.13-1.rhel6.x86_64 conflicts with file from package libevent-devel-2.0.12-1.rhel6.x86_64 file /usr/lib64/libevent_core.a from install of compat-libevent14-1.4.13-1.rhel6.x86_64 conflicts with file from package libevent-devel-2.0.12-1.rhel6.x86_64 file /usr/lib64/libevent_core.so from install of compat-libevent14-1.4.13-1.rhel6.x86_64 conflicts with file from package libevent-devel-2.0.12-1.rhel6.x86_64 file /usr/lib64/libevent_extra.a from install of compat-libevent14-1.4.13-1.rhel6.x86_64 conflicts with file from package libevent-devel-2.0.12-1.rhel6.x86_64 file /usr/lib64/libevent_extra.so from install of compat-libevent14-1.4.13-1.rhel6.x86_64 conflicts with file from package libevent-devel-2.0.12-1.rhel6.x86_64 This is because the libevent is coming from the postgresql repository, so I thought I just disable the postgresql repository and try again: yum --disablerepo=pgdg91 install gearmand Error: Package: gearmand-0.14-3.el6.2.x86_64 (epel) Requires: libevent-1.4.so.2()(64bit) Available: libevent-1.4.13-1.el6.x86_64 (base) libevent-1.4.so.2()(64bit) Installed: libevent-2.0.12-1.rhel6.x86_64 (@pgdg91) Not found Is there a way to keep the libevent version used by postgresql and at the same time install gearmand (with the correct libevent version)?

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• Configuration for Router Behind Uverse 2Wire

  - by Nori

  I have a 2Wire Uverse router(RG). I'm not particularly fond of it and want to use it as a modem only. I have a Linksys router with Tomato firmware on it and want that to be configured as the router. Most of the "guides" I've seen in my searches has been to enable DMZ Plus mode, but I don't see a way to make that work while my router has a static IP address. I played with it for quite some time yesterday and didn't see a way to get it to work. Then I ran across a setting in broadband for configuring another network. I played with that for a little bit but ran out of time and couldn't get it to work. So my question is for anyone out there who has Uverse and successfully setup a Tomato based firmware router behind the RG. How did you get it configured? I'm sure if I continued playing with it I could get it to work, but if someone out there already has it working then that would make my life easier. Thoughts? Thanks.

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• System32 files can be deleted in Windows 2008 but not in Windows 2003 [closed]

  - by Harvey Kwok

  I have been using Windows 2003 for a long time. There is a wonderful feature. I don't know the name of it but the feature is like this. You can rename or delete some important files inside C:\windows\system32. e.g. kerberos.dll. After a while, the deleted files will be automatically recovered. I think this is because those files are criticl enough that Windows cannot survive without them. However, in Windows 2008, this feature is gone. Instead, all the files in System32 are owned by TrustedInstaller. However, as a administrator, I can still take the ownserhip of the files and then delete them. Windwos 2008 won't recover the deleted files and hence the system is screwed next time it's reboot. So, I wonder why Windows 2008 dropping that wonderful feature. Was that auto-recovery feature also suffer from some issues? Does Windows 2008 have some other features that can prevent this type of disaster from happening?

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• High latency issue for web service call from amazon aws ec2 to local server

  - by SibzTer

  We have a legacy web application that is running in our data center on premises located in Houston. We have a developed a new .net 4 based web application in order to provide new features to customers. The new web application is hosted in amazon aws ec2 environment (N. Virginia region us-east-1b zone). In order to get seamlessly integrate with the legacy application the new web application makes web service calls to retrieve data. We are seeing an unusually high latency time in the order of 5+ seconds for these web service calls. The exact same web service call returns in less than a second on our local PCs (which makes sense given physical proximity to the actual server). The weird part is that we have developers in California who also have the same milliseconds response time. We are testing the web service response using third party tools such as SoapUI, Google Chrome extensions such as Advanced REST Client, Postman REST Client, etc. As if this wasnt weird enough, we have noticed the same low latency from certain other ec2 instances while testing which are in the same region and availability zone as well. If we experienced the high latency consistently from all the ec2 instances I could understand. But there is something else going on. Comparing the various stats and results between the low latency and high latency ec2 servers do not show any significant differences: ping (constant 40ms), tracert, winmtr, etc. We have instances that are in the VPC as well. So I tried both the public and private IP address of the web service host server and that didnt make a difference either for the above results. We need to resolve this latency issue as this is causing the resulting web pages to load very slowly (almost 15+ seconds which is simply unacceptable). The ec2 instances have Windows Server Datacenter 64 bit. Let me know if there is any other infor I can provide to help diagnose this.

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• Active directory Kerberos OSX problems

  - by Temotodochi

  I'll try to keep this short, but informative. I'm currently unable to bind OSX lion (10.7.4) machines to our AD. OSX kerberos (heimdal) is unable to locate the KDC service. However i can bind linux & windows machines to the AD without any problems in the same network AD controls the domain DNS and all the relevant _kerberos._tcp.x.domain.com and _kpasswd SRV DNS records are there and resolve fine when tried from OSX machines. Defined ports are open for service and manually accessible from OSX. When i try kinit in the OSX, i can get the first auth through (wrong passwords fail instantly), but when supplied with correct password, kinit fails after some waiting with "unable to reach KDC". All machines run NTP and have correct time. During testing, network is not firewalled between the machines Linux and windows machines have no problems whatsoever I have tried with and without /etc/krb5.conf - OSX by default does not need it in the krb5.conf i used a working config from one of our linux machines. dsconfigad fails with simple "connection failed to the directory server" I'm a bit baffled with this. OSX is like the KDC is nowhere to be found and at the same time my test machines with windows 7 and some linux (centos 6 & debian 6) machines have no problems whatsoever. Same network, same configurations. I'm missing some vital piece of configuration somewhere, and i can't find out what it is.

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• Failed to connect from slave to master with error "error connecting to master (1045)"

  - by Victor Lin

  I try to setup replication from slave to the master. CHANGE MASTER TO MASTER_HOST = 'master', MASTER_PORT = 3306, MASTER_USER = 'repl', MASTER_PASSWORD = 'xxx'; And I did grant privileges to the user on master. I can connect with mysql command from slave machine to the master mysql -h master -u repl -p mysql> show grants; GRANT RELOAD, SUPER, REPLICATION SLAVE, CREATE USER ON *.* TO 'repl'@'xxx' IDENTIFIED BY PASSWORD 'xxx' mysql> select 1; +---+ | 1 | +---+ | 1 | +---+ 1 row in set (0.04 sec) As you can see, privileges are correct, connection works fine, but however, the connection for replication to master always failed. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: Read_Master_Log_Pos: 4 Relay_Log_File: slave-replay-bin.000002 Relay_Log_Pos: 4 Relay_Master_Log_File: Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 0 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master:3306' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec) Is this caused by different version of MySQL server? The version of master is 5.0.77, and the slave is 5.5.13. But all articles I could find tell me that it's okay to replicate from a newer slave to old master. How to solve this problem? -- Update -- I even try to upgrade the old MySQL, but still, the problem is not solved. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File: slave-replay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: master-bin.000007 Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 107 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec)

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• How harmful is a hard disk spin cycle?

  - by Gilles

  It is conventional wisdom¹ that each time you spin a hard disk down and back up, you shave some time off its life expectancy. The topic has been discussed before: Is turning off hard disks harmful? What's the effect of standby (spindown) mode on modern hard drives? Common explanations for why spindowns and spinups are harmful are that they induce more stress on the mechanical parts than ordinary running, and that they cause heat variations that are harmful to the device mechanics. Is there any data showing quantitatively how bad a spin cycle is? That is, how much life expectancy does a spin cycle cost? Or, more practically, if I know that I'm not going to need a disk for X seconds, how large should X be to warrant spinning down? ¹ But conventional wisdom has been wrong before; for example, it is commonly held that hard disks should be kept as cool as possible, but the one published study on the topic shows that cooler drives actually fail more. This study is no help here since all the disks surveyed were powered on 24/7.

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• Windows 7 machine, can't connect remotely until after ping

  - by rjohnston

  I have a Windows 7 (Home Premium) machine that doubles as a media centre and subversion server. There's a couple of problems with this setup, when connecting to the server from an XP (SP3) machine: Firstly, the machine won't respond to it's machine name until after it's IP address has been pinged. Here's an example: Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\Documents and Settings\Rob>ping damascus Ping request could not find host damascus. Please check the name and try again. C:\Documents and Settings\Rob>ping 192.168.1.17 Pinging 192.168.1.17 with 32 bytes of data: Reply from 192.168.1.17: bytes=32 time=2ms TTL=128 ... Ping statistics for 192.168.1.17: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 2ms, Average = 1ms C:\Documents and Settings\Rob>ping damascus Pinging damascus [192.168.1.17] with 32 bytes of data: Reply from 192.168.1.17: bytes=32 time<1ms TTL=128 .... Ping statistics for 192.168.1.17: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms C:\Documents and Settings\Rob> Likewise, subversion commands with either the machine name or IP address will fail until the machine's IP address is pinged. Occasionally, the machine won't respond to pings on it's IP address, it'll just come back with "Request timed out". The svn server is VisualSVN, if that helps... Any ideas?

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• Tomcat deployment overwrites context.xml

  - by Kristoffer

  Hi, I'm pretty new to Tomcat in general, so please point out if got anything wrong. My question is regarding updates to already deployed apps, using the Tomcat manager. But first thing first. I'm using the META-INF/Context.xml for storing connection info for the database connections, so this is unique to every server the application is deployed to. I'm not sure if this is optimal but it's the only way I know. So, when updating the application, it's important that this file doesn't get modified, because I don't want to have to go in and remake all changes every time I update my app. For updating, I'm using the Tomcat Manager, and I've tried different approaches but everything seems to build on the process of undeploy, then deploy the new version. This way, the Context.xml gets removed/replaced by an empty Context.xml file. So my question is basically, how do I update a running webapp, and at the same time having the Context.xml left untouched? Btw, I'm running Tomcat 6.0.24.

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• Is there any limit to AIX 5.3 pipe size ?

  - by snowflake

  Hello, I'm in trouble while performing cat/tail/head operation on large files on Aix 5.3. When asking for a cat of several 1Go file redirected to another one: cat file1 file2 file3 > outputfile The outputfile is limited to 2Go (cat: output error and result file is 2147483647 bytes) Filesystem is jfs2. I successfully uploaded through ftp 10Go files on the filesystem without problem. I found nothing relevant in etc/security/limits: default: fsize = -1 core = 2097151 cpu = -1 data = 262144 rss = 65536 stack = 65536 nofiles = 20000 ulimit -a core file size (blocks) unlimited data seg size (kbytes) 245759 file size (blocks) unlimited max memory size (kbytes) unlimited open files 2000 pipe size (512 bytes) 64 stack size (kbytes) 32768 cpu time (seconds) unlimited max user processes 2048 virtual memory (kbytes) 278527 The problem does not occur on another AIX 5.3 server, I'm just looking for a different configuration that might be the source of the problem. /etc/security/limits on the server without the problem: default: fsize = -1 core = 2097151 cpu = -1 data = 262144 rss = 65536 stack = 65536 nofiles = 20000 ulimit -a on the server without the problem: core file size (blocks, -c) 1048575 data seg size (kbytes, -d) 131072 file size (blocks, -f) unlimited max memory size (kbytes, -m) 32768 open files (-n) 20000 pipe size (512 bytes, -p) 64 stack size (kbytes, -s) 32768 cpu time (seconds, -t) unlimited max user processes (-u) 262144 virtual memory (kbytes, -v) unlimited

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• I am looking for a tool to measure or detect "unresponsiveness" of a desktop PC

  - by Tom H

  I have a client that provides some server systems to a hospital, and a support ticket was raised that the desktop application was hanging waiting for the server. We did some extensive testing and its pretty clear that the server is responsive, and the network is fine, and that the problem is on the client end. (no requests are received during the hang etc...) We take a look at the desktop machines and they should be fine, so we raise tickets with the software vendor who says that it must be the hardware, the hardware company says that it is the software, etc etc Anyway, so talking to the nurses, they say that these machines often "hang" for 30 seconds at a time, and sometimes during important moments where they need to get data for a patient who is unwell, such as charts and status. So I want to stick a client on these machines that would be able to detect arbitrary "unresponsiveness" of the keyboard/mouse and log that for analysis later. Obviously I am wary to suggest some application that takes resources and makes the problem even worse, so I would interested to see any tools that would detect these (is it correct to say that the keyboard interrupts are being discarded?) scenarios by looking for the OS discarding the interrupts, or whatever is appropriate here. so go on then serverfault, here is your chance to save a life.... ;-) Edit: I am starting to think that some of the tools associated with real time systems might be appropriate, at least as a diagnostic.

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• W2K INACCESSIBLE_BOOT_DEVICE, with System Commander

  - by Gary Kephart

  I have a system that was originally had Win NT. I added System Commander (SC7) and then added W2K. The relevant partitions are: 0 - Primary - MultiFAT (Has Win NT, mapped to C:) 1 - Extended - with many logical partitions: 1.1 NTFS which has W2K and is mapped to D: 1.2 other logical partitions which are irrelevant to this D: was getting full. It needed room for virus definitions and Windows upgrades. In the past, I had simple used SC7 to resize D: without problems. So I did it again this time. However, upon finishing, I got the message "Unable to create partition". It also marked the partition as unformatted. I checked that the files on the disk were still there using SC7's Partition Explorer, and they were there. I continued and the system managed to boot up fine anyways. Then I rebooted the system again. This time, I got a message saying "INACCESSIBLE_BOOT_DEVICE". I went back in to SC7 and to Partition Commander, and it was still saying that the partition was unformatted but the Partition Explorer still showed the files on the system. I finally decided to resize the partition again, figuring that this would force a rewrite of the partition information. That seemed to work, until I had to reboot again. Now I can't see the files using Partition Explorer, and the Resize button is now disabled. What now?

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• is it good to have or difference between ADSL Modem+WiFi Router and Separate ADSL Modem & Wi-Fi Router?

  - by vikas devde

  I have ADSL2 Modem which I got from my service provider, now I want to setup wireless(Wi-Fi) in my home. I went to shop, where I came to know that there are routers which come up with modem also but they are priced lil higher than the only wi-fi routers. Now it is obvious that I should go for only wi-fi one, as I already have modem. My question is, is there any difference between ADSL+router and only router? I think if I use ADSL+router, the speed will increase lilbit, as modem does modulate and demodulate signals, and router also generates wireless signal, that is time to take conversions is doubled, and if I use ADSL+modem, it will directly convert the signals to wireless, and time will be saved, so the overall speed will increase lilbit. This is what my concept is(Which might be wrong). What do you guys would suggest me? should I take my current modem away and buy an ADSL+router or I should keep my modem and buy only wi-fi one. Please tell me the difference and suggest me which one I should go with, and also suggest me which company router I should go for.

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• [Ubuntu 10.04] mdadm - Can't get RAID5 Array To Start

  - by Matthew Hodgkins

  Hello, after a power failure my RAID array refuses to start. When I boot I have to sudo mdadm --assemble --force /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 to get mdadm to notice the array. Here are the details (after I force assemble). sudo mdadm --misc --detail /dev/md0: /dev/md0: Version : 00.90 Creation Time : Sun Apr 25 01:39:25 2010 Raid Level : raid5 Used Dev Size : 1465135872 (1397.26 GiB 1500.30 GB) Raid Devices : 6 Total Devices : 6 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Jun 17 23:02:38 2010 State : active, Not Started Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 128K UUID : 44a8f730:b9bea6ea:3a28392c:12b22235 (local to host hodge-fs) Events : 0.1249691 Number Major Minor RaidDevice State 0 8 65 0 active sync /dev/sde1 1 8 81 1 active sync /dev/sdf1 2 8 97 2 active sync /dev/sdg1 3 8 49 3 active sync /dev/sdd1 4 8 33 4 active sync /dev/sdc1 5 8 17 5 active sync /dev/sdb1 mdadm.conf: # by default, scan all partitions (/proc/partitions) for MD superblocks. # alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions /dev/sdb1 /dev/sdb1 # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # definitions of existing MD arrays ARRAY /dev/md0 level=raid5 num-devices=6 UUID=44a8f730:b9bea6ea:3a28392c:12b22235 Any help would be appreciated.

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• NFS headaches with FreeBSD 4.9

  - by Ernie

  Once upon a time, this used to work, and I kept the configuration the same, but... now nothing. I'm just trying to get an NFS server set up on a FreeBSD 4.9 server. The process should be about as complicated as this: Add this entry to /etc/exports: /var/home /var/vpopmail/domains -maproot=root XXX.XX.XX.XXX Execute this: portmap nfsd -u -t -n 4 mountd -r Then this should work, regardless of network and firewall issues: showmount -e localhost But showmount -e localhost fails with the following error: RPC: Port mapper failure showmount: can't do exports rpc And even if I kill off the NFS daemon, and try a rpcinfo -p localhost, I get this error: rpcinfo: can't contact portmapper: rpcinfo: RPC: Unable to receive; errno = Connection reset by peer The portmapper is still running. Why the heck does nothing work as if it isn't? Edit to add: FYI: Sockstat gives me this: $ sockstat |egrep "(nfsd|portmap)" root nfsd 86310 3 udp4 *:2049 *:* root nfsd 86310 4 udp4 *:973 *:* root portmap 45920 0 tcp4 *:111 *:* Then, at a later time (say, 5 minutes) it's as if nfsd isn't acting as a server: $ sockstat |egrep "(nfsd|portmap)" root portmap 45920 0 tcp4 *:111 *:* But the nfs daemon is still running: $ ps ax |grep nfsd 86311 ?? I 0:00.00 nfsd: server (nfsd) 86312 ?? I 0:00.00 nfsd: server (nfsd) 86313 ?? I 0:00.00 nfsd: server (nfsd) 86314 ?? I 0:00.00 nfsd: server (nfsd)

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• MySQL Master-Master w/ multiple read slave cost effective setup in AWS

  - by Ross

  I've been evaluating Amazon Web Services RDS for MySQL and costing out potential scenarios involving a simple multi-AZ deployment read/write setup vs. a multi-AZ deployment mysql master (hot-standby) with additional read-only slaves. the issue I'm trying to cost-optimize includes their reserved instance vs on-demand instances. Situation 1: purchase reserved multi-az setup for Extra-large-hi-mem(17GB RAM) instance for $5200/yr and have my application query the master all the time. the problem is, if I don't need all the resources of the (17GB RAM) all the time and therefore, especially not a hot-standby, what alternatives for savings can a better topology create, like potentially situation 2 below: Situation 2: purchase reserved multi-az setup using smaller master instances than above for the master-master hot-standby to receive the writes only. Then create and load balance several read-only slaves off the master and add/remove and/or scale up/down the read slaves based on demand. This might only cost $1000 + the on-demand usage of the read slaves. My thinking is, if I have a variable read-intensive application load, with low write load, the single level topology in situation 1 means I'm paying for a lot of resources at the write level of topology when I don't need them there. My hope is that situation 2 can yield cost savings from smaller reserved instances on the master-master resource level allowing me to scale up and down and/or out on the read-level according to demand as needed. Does anyone see a downside to doing this or know of some reason this isn't possible with RDS? Any other thoughts or advice always welcome of course. Thanks in advance, R

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• ping/ssh networking problem with server from 1 particular windows xp laptop

  - by user47650

  I am experiencing an odd problem with one specific server at my data centre connecting from my laptop. Basically the server is accessible from other machines in my house, but not from 1 particular laptop which is running windows XP. I have setup tcpdump on the server and wireshark on the laptop, and I can see ping echo request and reply packets that actually make it back to the wireshark on the laptop, but nothing shows in the ping console output like so; $ ping xxx.55.32.255 Pinging xxx.55.32.255 with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for xxx.55.32.255: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), But I can see from the wireshark on my local laptop that the ping reply gets back... No. Time Source Destination Protocol Info 46 3.964474 192.168.1.64 xxx.55.32.255 ICMP Echo (ping) request Frame 46 (74 bytes on wire, 74 bytes captured) Ethernet II, Src: Intel_31:d3:01 (00:19:d2:42:c3:01), Dst: ThomsonT_01:b8:2c (00:14:7f:02:b9:3c) Internet Protocol, Src: 192.168.1.64 (192.168.1.64), Dst: xxx.55.32.255 (xxx.55.32.255) Internet Control Message Protocol No. Time Source Destination Protocol Info 48 4.119060 xxx.55.32.255 192.168.1.64 ICMP Echo (ping) reply Frame 48 (74 bytes on wire, 74 bytes captured) Ethernet II, Src: ThomsonT_01:b8:2c (00:14:7f:01:b8:2c), Dst: Intel_21:c3:01 (10:20:d2:31:c3:01) Internet Protocol, Src: xxx.55.32.255 (xxx.55.32.255), Dst: 192.168.1.64 (192.168.1.64) Internet Control Message Protocol obviously I have disabled the windows firewall and there is nothing in the windows event log. There is nothing else obviously strange about the server as it is the same build as other servers that I can connect to fine.

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• Webserver optimization

  - by f-aminov

  Hi guys! I have a website hosted on a VPS (512Mb - minimum guranteed memory, 510Mhz proccessor, Debian 5.0 Lenny, Apache 2.2.9 with nginx 0.7.65 as a frontend to serve static content, MySQL 5.1.44, PHP 5.3.2 with APC caching). I'm a web developer, so I'm not very good at optimizing servers, but I've managed to install and setup all those neccessary components (LAMP, nginx, etc.). After that I decided to stress test my website (which uses Drupal 6.16 with caching and all possible optimization enabled) using a utility called "Webserver Stress Tool 7". And it seems to me that the results aren't any good - here is a graph (sorry, as a new user I'm not allowed to post images) As you can see the response time depending on amount of simultaneous users increases very quickly. With 10 simultaneous users the time is about 1000ms, with 100 simultaneous users it's about 15000ms (15s!). The question is do you think this is normal behavior for such a server or something is wrong with the settings and optimization? If you think something is wrong what particulary could be wrong? Any other suggestion how to speed this a little bit up?

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• FreeBSD slow transfers - RFC 1323 scaling issue?

  - by Trey

  I think I may be having an issue with window scaling (RFC 1323) and am hoping that someone can enlighten me on what's going on. Server: FreeBSD 9, apache22, serving a static 100MB zip file. 192.168.18.30 Client: Mac OS X 10.6, Firefox 192.168.17.47 Network: Only a switch between them - the subnet is 192.168.16/22 (In this test, I also have dummynet filtering simulating an 80ms ping time on all IP traffic. I've seen nearly identical traces with a "real" setup, with real internet traffic/latency also) Questions: Does this look normal? Is packet #2 specifying a window size of 65535 and a scale of 512? Is packet #5 then shrinking the window size so it can use the 512 scale and still keep the overall calculated window size near 64K? Why is the window scale so high? Here are the first 6 packets from wireshark. For packets 5 and 6 I've included the details showing the window size and scaling factor being used for the data transfer. Code: No. Time Source Destination Protocol Length Info 108 6.699922 192.168.17.47 192.168.18.30 TCP 78 49190 http [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=945617489 TSecr=0 SACK_PERM=1 115 6.781971 192.168.18.30 192.168.17.47 TCP 74 http 49190 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=512 SACK_PERM=1 TSval=2617517338 TSecr=945617489 116 6.782218 192.168.17.47 192.168.18.30 TCP 66 49190 http [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSval=945617490 TSecr=2617517338 117 6.782220 192.168.17.47 192.168.18.30 HTTP 490 GET /utils/speedtest/large.file.zip HTTP/1.1 118 6.867070 192.168.18.30 192.168.17.47 TCP 375 [TCP segment of a reassembled PDU] Details: Transmission Control Protocol, Src Port: http (80), Dst Port: 49190 (49190), Seq: 1, Ack: 425, Len: 309 Source port: http (80) Destination port: 49190 (49190) [Stream index: 4] Sequence number: 1 (relative sequence number) [Next sequence number: 310 (relative sequence number)] Acknowledgement number: 425 (relative ack number) Header length: 32 bytes Flags: 0x018 (PSH, ACK) Window size value: 130 [Calculated window size: 66560] [Window size scaling factor: 512] Checksum: 0xd182 [validation disabled] Options: (12 bytes) No-Operation (NOP) No-Operation (NOP) Timestamps: TSval 2617517423, TSecr 945617490 [SEQ/ACK analysis] TCP segment data (309 bytes) Note: originally posted http://forums.freebsd.org/showthread.php?t=32552

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• Running a VM off a USB 2.0 Flash Drive - Mac/Parallels/XP

  - by geerlingguy

  I use a MacBook Air as my primary machine, and the 128GB SSD means space is precious. To save about 10 GB, I've been running Parallels with a Windows XP VM off an external USB hard drive, which performs as well in everyday use as running the VM off the internal SSD. So, I bought a tiny 32GB USB 2.0 flash drive, plugged it into the MacBook Air, formatted it first as ExFAT (which was slow), then as Mac OS Extended (Journaled) (which was also slow), and copied over my VM file, and ran Parallels off it. My full experience is documented here: http://www.midwesternmac.com/blogs/jeff-geerling/running-windows-xp-vm Straight file copies are really fast — 30 MB/sec read (solid the whole time), and 10-11 MB/sec write (solid the whole time). But I noticed that once XP started running, the disk access rates were in the low KB ranges. Are USB flash drives really that poor at random access, or could I possibly be missing something (the format of the flash drive, etc.?)? Of note, I've tried the following, to no great effect: Formatting the drive as either ExFAT or Mac OS Extended (Journaled) Unplugging all other USB devices and turning off Bluetooth (which runs on the right-side-port USB bus). Plugging in the flash drive either direct in the right side port, or the left side port, or into a USB 2.0 hub

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• Accounting setup in freeradius with mikrotik and the "always" module

  - by Matt

  I have a freeradius setup that is being used to provide authentication for users on a wireless network. The access points are all Mikrotik hardware and the users are connected 24/7. We've been using Daloradius with mysql and freeradius 2. The boss wants to use the accounting information and while this is all set up and appears to be working, I've found that not all the accounting information is present. Since our users may be connected for more than 24 hours at a time we keep this in here, it will reset some attributes daily so that the accounting packets work correctly. So he started poking around at this link: http://wiki.mikrotik.com/wiki/RouterOs_MySql_Freeradius#Configuring_RouterOs_for_Radius_.26_PPP.2A_AAA And was looking specifically at the following section. Since our users may be connected for more than 24 hours at a time we keep this in here, it will reset some attributes daily so that the accounting packets work correctly always fail { rcode = fail } always reject { rcode = reject } always ok { rcode = ok simulcount = 0 mpp = no } However, that link references freeradius 1 and I can't find this in the radius.conf file for freeradius 2. What does it do and could it be a reason I'm missing data? EDIT: I have found one issue. We have a backup freeradius server that is also receiving the accounting packets. Although they are replicating, it's only a master/slave configuration. If the slave receives accounting packets it won't replicate them back to the master. Although I suspect this might solve it, the boss is not convinced due to the always module. Is there anything special I need to configure in the mikrotik AP's or freeradius 2 for clients connected 24/7.

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• None of usb-controllers are working after a crash

  - by Cray

  So I have a GA-p35-DS4 mboard with a Q6600, running windows7-x64. After a random crash with a bluescreen (not caused by anything particular as I recall), none of the usb-controllers are working. (And none of the devices connected to those usb ports). All the controllers are showed up in the device manager, but every one has a warning-icon (as they are not functioning properly). The windows identifies them correctly, it shows exactly the model of each controller, and it says that the driver is installed. Now, when I try to reinstall the driver (Update driver menu item in the device manager), it tries to find it, finds the driver, but quits saying that the driver was found but could not be installed. Additionally, it displays "This operation requires an interactive window station", whatever that means... Now get this, the same thing happens with a new pci-usb controller card! It is found (actually each time the machine starts, it is found as new hardware), but trying to install drivers leads nowhere, I am getting the same message about an interactive window station. (tried to install drivers from the acoompanying CD) I have tried deleting those devices from device manager and let windows find them again, but that leads to same results. None of the ports on this extension card work either. This should not be a hardware problem, a usb keyboard connected to the builtin usb controller works in bios, and even in another OS running the same computer (old xp installation) What to do? Will I have to reinstall? Can deleting infcache.1 help? Is there some way to let windows remove all old drivers and try to find all hardware again, this time only looking for drivers on a windows install disk or something?

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• ajax.googleapis.com stopping my Firefox

  - by Oscar Reyes

  Today for some strange reason, Firefox stops working properly because it is trying to fetch something from ajax.googleapis.com. Is there something I can do to avoid this? Safari and Chrome work just fine. I tried uninstalling Firebug and clearing the cache. The only thing that worked was disabling the JavaScript altogether. This seems to be the culprit link: http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js What can I do? EDIT I think I have found where the problem is. My proxy is serving one byte at a time the file, so firefox consume it at that peace. What I don't understand is why Safari and Chrome takes it right away. What I did last night was, leave the FF open all the night to give him change to load the file, my hope was that I got cached and the next time there was no need to go for it. Today in the morning, the page load successfully but the page was not cached, because the next request failed the same. Here's a video showing the problem:

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• Running Upstart user jobs on startup

  - by dgel

  I am running Ubuntu server 11.04. I have created an Upstart user job as described here. I have the following file at my /home/myuser/.init/sensors.conf: start on started mysql stop on stopping mysql chdir /home/myuser/mydir/project exec /home/myuser/mydir/env/bin/python /home/myuser/mydir/project/manage.py sensors respawn respawn limit 10 90 As myuser I can start, stop, and reload the job fine- it works perfectly: $ start sensors sensors start/running, process 1332 $ stop sensors sensors stop/waiting The problem is that the job is not starting automatically at boot when mysql starts. After a fresh boot, mysql is running but my sensors job is not. What's strange, is that although the job doesn't begin on bootup, if I use sudo to restart mysql it does indeed start my job. The following commands are run as myuser from a fresh startup: $ status sensors sensors stop/waiting $ sudo restart mysql mysql start/running, process 1209 $ status sensors sensors start/running, process 1229 The documentation for Upstart user jobs is pretty limited. What is the correct technique to have a user job start automatically on startup of the system? I know I can just throw something in rc.local to start it, or I could move my sensors.conf to /etc/init but I'm curious if there is a way to do it using just Upstart.

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