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• Managing scalability and availability with two servers running Apache Httpd, Apache Mina and MySQL

  - by celalo

  Hello, I am not a developer and I don't much experience with scalable server architectures. But I am in need of a highly available and scalable system for one of my projects. There is going to be two servers I am going to use for the time being. Both with 4 core CPUs and 8 GB RAM with RAID structures running CentOS 5.4. I will also have feature called "Failover IP" which enables to direct an IP address to another server within short time. The applications which will be run on the servers: There is going to be a Java application based on Apache Mina server for handling TCP requests from some hundreds of network devices where the devices are going to send request as much as one request per minute. Handling those requests, includes parsing the requests and inserting a few rows to the Database. Parsing requests before inserting data to the DB does take neglectable time. There is going to be MySQL server, as I stated above. Also there is going to be a PHP web application running on Apache Httpd Server which uses the same DB with the Java application. What I wish to have is to make use of those two servers at the most. I was imagining to have the servers identical, sharing the work load. MySQL could be a cluster maybe? And if some application fails or the whole machine goes down, the other will continue serving the requests seamlessly. Reminding that a "Failover IP" feature will be available for me to take advantage of. Also, It should be kept in mind that number of servers could increase in time, to meet the demand. What can you suggest? Which kind of tools I can make use of? Which kind of monitoring software (paid/unpaid) I have? Thanks in advance.

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• imapsync - Authentication failed

  - by Touff

  I've deployed many Google Apps accounts and have used imapsync a number of times to migrate accounts to Google Apps. This time however, no matter what I try imapsync refuses to work claiming my credentials are incorrect - I've checked them time and time again and they are 100% correct. On Ubuntu 12, built from source, my command is: imapsync --host1 myserver.com --user1 [email protected] --password1 mypassword1 -ssl1 --host2 imap.gmail.com --user2 [email protected] --password2 mypassword2 -ssl2 -authmech2 PLAIN Full output from the command: get options: [1] PID is 21316 $RCSfile: imapsync,v $ $Revision: 1.592 $ $Date: With perl 5.14.2 Mail::IMAPClient 3.35 Command line used: /usr/bin/imapsync --debug --host1 myserver.com --user1 [email protected] --password1 mypassword1 -ssl1 --host2 imap.gmail.com --user2 [email protected] --password2 mypassword2 -ssl2 -authmech2 PLAIN Temp directory is /tmp PID file is /tmp/imapsync.pid Modules version list: Mail::IMAPClient 3.35 IO::Socket 1.32 IO::Socket::IP ? IO::Socket::INET 1.31 IO::Socket::SSL 1.53 Net::SSLeay 1.42 Digest::MD5 2.51 Digest::HMAC_MD5 1.01 Digest::HMAC_SHA1 1.03 Term::ReadKey 2.30 Authen::NTLM 1.09 File::Spec 3.33 Time::HiRes 1.972101 URI::Escape 3.31 Data::Uniqid 0.12 IMAPClient 3.35 Info: turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1. Info: will try to use LOGIN authentication on host1 Info: will try to use PLAIN authentication on host2 Info: imap connexions timeout is 120 seconds Host1: IMAP server [SERVER1] port [993] user [USER1] Host2: IMAP server [imap.gmail.com] port [993] user [USER2] Host1: * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready. Host1: SERVER1 says it has CAPABILITY for AUTHENTICATE LOGIN Host1: success login on [SERVER1] with user [USER1] auth [LOGIN] Host2: * OK Gimap ready for requests from MY-VPS Host2: imap.gmail.com says it has CAPABILITY for AUTHENTICATE PLAIN Failure: error login on [imap.gmail.com] with user [USER2] auth [PLAIN]: 2 NO [AUTHENTICATIONFAILED] Invalid credentials (Failure) I have tried -authmech2 LOGIN as well which returns: Host2: imap.gmail.com says it has NO CAPABILITY for AUTHENTICATE LOGIN Failure: error login on [imap.gmail.com] with user [[email protected]] auth [LOGIN]: 2 NO [AUTHENTICATIONFAILED] Invalid credentials (Failure) If anyone can shed some light on this I would greatly appreciate it.

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• VirtualBox Issue: virtualbox changed my Computer Name's ip address in Windows

  - by suud

  I had installed virtualbox 4.2.2 in Windows 7. My Computer Name is: MY-PC My IP address (using ipconfig /all command) is: 192.168.1.101 My IP is dynamic and I set DNS to google dns (8.8.8.8) When I ping MY-PC, I got this result: Pinging MY-PC [192.168.56.1] with 32 bytes of data: Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 My virtualbox was not running and I expected the ip adress of MY-PC is 192.168.1.101, not 192.168.56.1 Then I run command: nbtstat -a MY-PC and I got this result: VirtualBox Host-Only Network: Node IpAddress: [192.168.56.1] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- MY-PC <00> UNIQUE Registered WORKGROUP <00> GROUP Registered MY-PC <20> UNIQUE Registered MAC Address = 08-00-27-00-60-B3 Local Area Connection: Node IpAddress: [0.0.0.0] Scope Id: [] Host not found. Wireless Network Connection: Node IpAddress: [192.168.1.101] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- MY-PC <00> UNIQUE Registered WORKGROUP <00> GROUP Registered MY-PC <20> UNIQUE Registered MAC Address = 94-0C-6D-E5-6D-5D So it seems virtualbox caused this problem. I want to know how to change back my Computer Name's ip address to 192.168.1.101 (or any ip address that set by my internet connection)?

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• How does a web server/the http protocol handle version control and compression?

  - by Sune Rasmussen

  When a client browser requests a file from the web server, I know that some kind of check is performed, because the files needed to serve the web page may already be cached by the web browser. So, if a file exists in the cache, no files are sent. But if the file on the server has changed since the file was cached in the browser, the file is sent and updated anyhow. Then, if you have compression like gzipping enabled on the server, the files that are to be provided to the client must be gzipped on the way, requiring some amount of server side processing. But how is this managed? The logical approach seems to me, that the web server should have a cache as well, containing the newest version of all files that have been requested within a certain time span, thus a compressed version of these files, so that compression would not have to be done each time a files is requested. And also, how are files eventually requested? Does the browser ask for files, each time it encounters one in the HTML code and the specific file is not stored in the local cache, or does it sum all the files that are needed up and ask for the whole bunch at the same time? But that's only guessing from a programming point of view, and I don't really know. If the answers are very different among web server systems, I'm primarily interested in Apache, but other answers are appreciated, too.

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• AWStats consumes too much resource, how to disable temporarily

  - by trante

  For some days AWStats takes %10-%20 of my CPU, takes 400-550 MB RAM and works for hours. Maybe my site's traffic became larger so process time takes more time than before or some bugs in program makes this. Anyway I want to disable AWStats temporarily. Maybe I would want to activate it in future. I found that answer. But it gives commands to remove AWStats. I only want to disable it temporarily. My system is Centos 6.3, Plesk 11.5.30 Update #19. I tried to disable cron jobs. I run this # killall awstats.pl I opened # vi /etc/cron.daily/awstats file and I changed it to this: #!/bin/sh #/usr/share/awstats/awstats_updateall.pl now -awstatsprog=/var/www/cgi-bin/awstats/awstats.pl -configdir=/etc/awstats >/dev/null 2>&1 exit 0 After some time I still see that awstats is running. What should I do more to not to awstats run again ? But without removing my files. After changing " /etc/cron.daily/awstats" file awstats doesn't start in daytime. But every night in 03:15 awstats starts again. Because of Plesk auto updates are working at that time, I changed from Plesk. Don't auto update automatically. But it seems like last night at 03:15 awstats started again. Is there any way to stop awstats temporarily except this solution ? Because this solution deletes awstats configs permanently and I don't know how to revert it back in future ? Turn off all AWStats for Plesk 11+ domains #!/bin/bash for i in /var/www/vhosts/*; do echo "Turning off and deleting Stats for" echo `basename $i` /usr/local/psa/admin/bin/webstatmng --unset-configs --stat-prog=awstats --domain-name=`basename $i` /usr/local/psa/admin/bin/webstatmng --clean --stat-prog=awstats --domain-name=`basename $i` done

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• Can ping IP address and nslookup hostname but cannot ping hostname

  - by Puddingfox

  I have a DNS server set up on one of my machines using BIND 9.7 Everything works fine with it. On my Windows 7 desktop, I have statically-assigned all network values. I have one DNS server set -- my DNS server. On my desktop, I can ping a third machine by IP fine. I can nslookup the hostname of the third machine fine. When I ping the hostname, it says it cannot find the host. / C:\Users\James>nslookup icecream Server: cake.my.domain Address: xxx.xxx.6.3 Name: icecream.my.domain Address: xxx.xxx.6.9 C:\Users\James>ping xxx.xxx.6.9 Pinging xxx.xxx.6.9 with 32 bytes of data: Reply from xxx.xxx.6.9: bytes=32 time<1ms TTL=255 Reply from xxx.xxx.6.9: bytes=32 time<1ms TTL=255 Reply from xxx.xxx.6.9: bytes=32 time<1ms TTL=255 Reply from xxx.xxx.6.9: bytes=32 time<1ms TTL=255 Ping statistics for xxx.xxx.6.9: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\Users\James>ping icecream Ping request could not find host icecream. Please check the name and try again. I have also specified the search domain as my.domain xxx.xxx and my.domain substituted for security Why can I not ping by hostname? I also can not ping using the FQDN. The problem is that this problem is shared by all applications that resolve hostnames. I cannot use PuTTY to SSH to my machines by hostname; only by IP

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• How to remove a plain text protecting single quote from all the selected cells in LibreOffice Calc?

  - by Ivan

  I've imported a CSV file having the first column to be date-time values in ISO 8601 format like 2012-01-01T00:00:00.000Z for the first moment of the year 2012. Then, willing to make LibreOffice to recognize the format (as I was looking forward to plot a diagram), I've selected the column, chosen Format Cells... and entered the custom time format as YYYY-MM-DDTHH:MM:SS.000Z And this seems to work if... I edit a cell to remove a hidden single-quote from its beginning (which serves to protect a cell content from being interpreted) as all the newly formatted cells now store values like '2012-01-01T00:00:00.000Z (note the single quote - it is only visible when you edit a particular cell). And I am to do so for all the cells in the column. How can I automate this? UPDATE: I've already found a solution for the particular case of mine: it helps to set a column format to "time" in the CSV import dialogue. But I am still curious how could this be done in case I wouldn't have the original .csv data file to import but only the .ods file with the data already imported without the format specified at the import time.

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• Windows 7 BSOD with Service Exception Error and Randomly Reboots

  - by Jason Shultz

  I've got a windows 7 laptop that BSOD with a Service Exception Error when I connect to a wireless network. It also does it when it's just sitting still doing nothing. I ran bluescreenview and here are the last four BSOD's from today: ================================================== Dump File : 051210-18642-01.dmp Crash Time : 5/12/2010 8:36:14 AM Bug Check String : SYSTEM_SERVICE_EXCEPTION Bug Check Code : 0x0000003b Parameter 1 : 00000000`c000001d Parameter 2 : fffff880`00000000 Parameter 3 : fffff880`06fda160 Parameter 4 : 00000000`00000000 Caused By Driver : Ntfs.sys Caused By Address : Ntfs.sys+7f030 File Description : Product Name : Company : File Version : Processor : x64 Computer Name : Full Path : C:\Windows\Minidump\051210-18642-01.dmp Processors Count : 2 Major Version : 15 Minor Version : 7600 ================================================== ================================================== Dump File : 051210-16551-01.dmp Crash Time : 5/12/2010 8:41:04 AM Bug Check String : SYSTEM_SERVICE_EXCEPTION Bug Check Code : 0x0000003b Parameter 1 : 00000000`c000001d Parameter 2 : fffff880`00000000 Parameter 3 : fffff880`06f40160 Parameter 4 : 00000000`00000000 Caused By Driver : ntoskrnl.exe Caused By Address : ntoskrnl.exe+70600 File Description : NT Kernel & System Product Name : Microsoft® Windows® Operating System Company : Microsoft Corporation File Version : 6.1.7600.16539 (win7_gdr.100226-1909) Processor : x64 Computer Name : Full Path : C:\Windows\Minidump\051210-16551-01.dmp Processors Count : 2 Major Version : 15 Minor Version : 7600 ================================================== ================================================== Dump File : 051210-17269-01.dmp Crash Time : 5/12/2010 8:45:51 AM Bug Check String : SYSTEM_SERVICE_EXCEPTION Bug Check Code : 0x0000003b Parameter 1 : 00000000`c000001d Parameter 2 : fffff880`00000000 Parameter 3 : fffff880`07db1160 Parameter 4 : 00000000`00000000 Caused By Driver : Ntfs.sys Caused By Address : Ntfs.sys+7f030 File Description : Product Name : Company : File Version : Processor : x64 Computer Name : Full Path : C:\Windows\Minidump\051210-17269-01.dmp Processors Count : 2 Major Version : 15 Minor Version : 7600 ================================================== ================================================== Dump File : 051210-19453-01.dmp Crash Time : 5/12/2010 5:46:25 PM Bug Check String : SYSTEM_SERVICE_EXCEPTION Bug Check Code : 0x0000003b Parameter 1 : 00000000`c000001d Parameter 2 : fffff880`00000000 Parameter 3 : fffff880`02625160 Parameter 4 : 00000000`00000000 Caused By Driver : win32k.sys Caused By Address : win32k.sys+2d4201 File Description : Product Name : Company : File Version : Processor : x64 Computer Name : Full Path : C:\Windows\Minidump\051210-19453-01.dmp Processors Count : 2 Major Version : 15 Minor Version : 7600 ==================================================  

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• Unable to access Windows share

  - by mbnoimi

  I've installed Alfresco 4.2.d under Ubuntu 12.04 LTS; Everything done fine except I can't access it from Windows share although I got the link from Alfresco explorer which is: file:///%5C%5CECSA%5CAlfresco%5CSites%5Cswsdp%5CdocumentLibrary%5CAgency%20Files%5CImages%5Ccoins.JPG I tried to access it from: \\ECSA but I failed too so I made a ping (192.168.0.70 is server IP) then I got: C:\Users\user>ping 192.168.0.70 Pinging 192.168.0.70 with 32 bytes of data: Reply from 192.168.0.70: bytes=32 time<1ms TTL=64 Reply from 192.168.0.70: bytes=32 time<1ms TTL=64 Reply from 192.168.0.70: bytes=32 time<1ms TTL=64 Reply from 192.168.0.70: bytes=32 time<1ms TTL=64 Ping statistics for 192.168.0.70: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\Users\user>ping ECSA Ping request could not find host ECSA. Please check the name and try C:\Users\user> Some logs of what's going on: C:\Users\user>net view ECSA System error 1707 has occurred. The network address is invalid. C:\Users\user>nbtstat -a 192.168.0.70 Local Area Connection: Node IpAddress: [192.168.0.84] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- ECSA <20> UNIQUE Registered ECSA <00> UNIQUE Registered WORKGROUP <00> GROUP Registered MAC Address = 00-00-00-00-00-00 C:\Users\user> CIFS Server Configuration in file-servers.properties ### CIFS Server Configuration - file-servers.properties ### cifs.enabled=true cifs.serverName=${localname}A cifs.domain= cifs.broadcast=255.255.255.255 cifs.bindto=192.168.0.70 cifs.ipv6.enabled=false cifs.hostannounce=true cifs.disableNIO=false cifs.disableNativeCode=false cifs.sessionTimeout=900 cifs.maximumVirtualCircuitsPerSession=16 cifs.tcpipSMB.port=445 cifs.netBIOSSMB.sessionPort=139 cifs.netBIOSSMB.namePort=137 cifs.netBIOSSMB.datagramPort=138 cifs.WINS.autoDetectEnabled=true cifs.WINS.primary=192.168.0.70 cifs.WINS.secondary=192.168.0.1 cifs.sessionDebug= cifs.pseudoFiles.enabled=true cifs.pseudoFiles.explorerURL.enabled=true cifs.pseudoFiles.explorerURL.fileName=__Alfresco.url cifs.pseudoFiles.shareURL.enabled=false cifs.pseudoFiles.shareURL.fileName=__Share.url How can I fix this issue?

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• Rebooting access point via SSH with pexpect... hangs. Any ideas?

  - by MiniQuark

  When I want to reboot my D-Link DWL-3200-AP access point from my bash shell, I connect to the AP using ssh and I just type reboot in the CLI interface. After about 30 seconds, the AP is rebooted: # ssh [email protected] [email protected]'s password: ******** Welcome to Wireless SSH Console!! ['help' or '?' to see commands] Wireless Driver Rev 4.0.0.167 D-Link Access Point wlan1 -> reboot Sound's great? Well unfortunately the ssh client process never exits, for some reason (maybe the AP kills the ssh server a bit too fast, I don't know). My ssh client process is completely blocked (even if I wait for several minutes, nothing happens). I always have to wait for the AP to reboot, then open another shell, find the ssh client process ID (using ps aux | grep ssh) then kill the ssh process using kill <pid>. That's quite annoying. So I decided to write a python script to reboot the AP. The script connects to the AP's CLI interface via ssh, using python-pexpect, and it tries to launch the "reboot" command. Here's what the script looks like: #!/usr/bin/python # usage: python reboot_ap.py {host} {user} {password} import pexpect import sys import time command = "ssh %(user)s@%(host)s"%{"user":sys.argv[2], "host":sys.argv[1]} session = pexpect.spawn(command, timeout=30) # start ssh process response = session.expect(r"password:") # wait for password prompt session.sendline(sys.argv[3]) # send password session.expect(" -> ") # wait for D-Link CLI prompt session.sendline("reboot") # send the reboot command time.sleep(60) # make sure the reboot has time to actually take place session.close(force=True) # kill the ssh process The script connects properly to the AP (I tried running some other commands than reboot, they work fine), it sends the reboot command, waits for one minute, then kills the ssh process. The problem is: this time, the AP never reboots! I have no idea why. Any solution, anyone?

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• postgresql No space left on device

  - by pstanton

  Postgres is reporting that it is out of disk space while performing a rather large aggregation query: Caused by: org.postgresql.util.PSQLException: ERROR: could not write block 31840050 of temporary file: No space left on device at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1592) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1327) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:192) at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:451) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:350) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:304) at org.hibernate.engine.query.NativeSQLQueryPlan.performExecuteUpdate(NativeSQLQueryPlan.java:189) ... 8 more However the disk has quite a lot of space: Filesystem Size Used Avail Use% Mounted on /dev/sda1 386G 123G 243G 34% / udev 5.9G 172K 5.9G 1% /dev none 5.9G 0 5.9G 0% /dev/shm none 5.9G 628K 5.9G 1% /var/run none 5.9G 0 5.9G 0% /var/lock none 5.9G 0 5.9G 0% /lib/init/rw The query is doing the following: INSERT INTO summary_table SELECT t.a, t.b, SUM(t.c) AS c, COUNT(t.*) AS count, t.d, t.e, DATE_TRUNC('month', t.start) AS month, tt.type AS type, FALSE, tt.duration FROM detail_table_1 t, detail_table_2 tt WHERE t.trid=tt.id AND tt.type='a' AND DATE_PART('hour', t.start AT TIME ZONE 'Australia/Sydney' AT TIME ZONE 'America/New_York')>=23 OR DATE_PART('hour', t.start AT TIME ZONE 'Australia/Sydney' AT TIME ZONE 'America/New_York')<13 GROUP BY month, type, t.a, t.b, t.d, t.e, FALSE, tt.duration any tips?

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• Syncronization between folders MAC OS Lion

  - by Andre Carvalho

  I have an iMac at home and I use a Macbook pro for work. I also have a time capsule at home containing my main folder with my main files. I use it as a NAS besides the Time Machine backup tool. I have several personal files I need to be accessing both at home and at work. My wife, who works at home, uses sometimes the same .XLS files and .DOC files I might have used during my day at work, away from home. My question is: Is there a software, or tool that a I can use to sync my iMac and my MB Pro folders? Remembering that: There might be a chance that my wife and I have changed the same files during the day, so the files would have to be merged so none of the information added by either me or my wife would be lost. The software/tool that would be installed on the MB Pro would need to mount the Time Capsule volume so it could locate the main folder on it. It has to be done automatically when my MB is at home ( with a schedule option ); I have tested some softwares like synctwofolders and Chronosync but none fulfilled all my needs. The first couldn't mount the Time Capsule Volume and didn't have the many schedule options. I really liked Chronosync, but it doesn't merge the files. When it detects a conflict ( for instance: my wife changed a .DOC file on the iMAC and I changed the same file on the MB it asks you to choose which version you want to keep instead of allowing you simply to merge them ). I don't have much experience with automator or scripts but maybe you can give me a hand with that.

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• Why are snapshots considered as temporary backups not real backups?

  - by Samselvaprabu

  I am using VMware ESXi. In our team we use to provide snapshots for long term backup. Then we faced issues like memory spillover and the server got hang up. I started reading in VMware knowledgebase articles and everywhere. Everywhere it was recommended not to have snapshots for a long time. Even VMware advised to keep snapshots for maximum of three days. But our team kept asking us to have at least two permanent snapshots (till deleting the VM). Sometimes we may use the VM for a year). one snapshot is for fresh machine state. (So when we complete testing an application, we will revert back to fresh state and install another application) (If I did not allow that, I may often need to host the VM.) Next snapshot for keeping the VM in some state (maybe they would have found an issue and keep that state for some time. Or they may install prerequisites for the application and keep the machine ready for testing.) Logically, their needs seems to be fair. But if I allow that, I am to permit them to hold the snapshots for long time. We are not using our VM as a mail server or database server. Why is keeping snapshots for long time having an adverse effect? Why are snapshots considered as temporary backups, not real backups?

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• Exchange Out of Office Reply reset

  - by Richard West

  I have a question. We have an employee that is going to be on maternity leave for the next 8 weeks. I think that Outlook/Exchange is designed to send one out of office message to each person that sends an email to my user for the duration of the out of office reply. Meaning that if someone sends an email to my user each week they are only going to receive one out of office message - the first time they send her an e-mail. My concern is that over time people might forget that she is out of the office. Since they are not receiving any type of reply when they send an email this would seem possible. Does anyone know if Exchange ever resets the out of message notification after a certain amount of time? Like a week or so? I'm not looking for every message to get an out of office message, but I think more than one over the course of 8 weeks would be appropriate. I know that I can turn off and turn back on the out of office assistant to "reset" the replies, but I'm curious if Exchange performs a reset after a certain period of time automatically.

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• Need troubleshooting advice for intermittent dns problems with requests on isp nameservers

  - by Mnebuerquo

  I've been having some intermittent dns problems with a web server, where certain isp's dns servers don't have my hostnames in cache and fail to look them up. At the same time, queries to opendns for those hostnames resolve correctly. It's intermittent, and it always works fine for me, so it's hard to identify the problem when someone reports connectivity problems to my site. My website is on a server running linux with Plesk. My dns records are configured with plesk (so my server is its own dns master). Domain name is registered with godaddy. I'm not real knowledgeable about dns, so I don't really know how to begin with troubleshooting. I've started learning to use dig, but while I can read the manpage to learn the syntax, I don't really know what questions to ask. Since the problem is intermittent I haven't been able to really catalog many symptoms. Symptoms I have observed: Certain people repeatedly reported intermittent problems connecting to my website. This was only from certain networks. (Ex: One guy could connect reliably from his office but not his home.) Sometimes I notice my browser taking a long time looking up the hostname for my site (Firefox shows a message in the status bar at the bottom). For me this is in the ten second range. ssh connections from anywhere to my server take a long time to connect but then seem to work fine once connected. So hopefully the folks on serverfault can point me to a good beginner tutorial for understanding dns, and suggest troubleshooting questions to ask next time one of my users reports connectivity problems.

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• Amazon EC2 instance was not available for few minutes (amazon showed that everything ok)

  - by Salvador Dali

  Few minutes ago my amazon Ec2 instance was unavailable for a few minutes. During this time neither I was able to connect to web-site with http, nor I was able to ssh to it. Also I was not able to connect to my amazon management console for some time (less than amount of unavailability of my instance). When I was able to connect to management console, it was showing me that everything is running smoothly (but I still was not able to connect to instance in any way for a minute or two). During this time I have checked their status page just to see that there is no issues (my instance is in Ireland and there is nothing wrong there today). After that I was able to log in. I checked my logins with last to see that no one except me was logging in. I also looked in apache logs and there was no errors or warnings during this time. Right now when I see my amazon monitor, I see a small spike in CPU in last 15 minutes (but this is from 10% to like 20%) I have no idea what can it be (I have never experienced anything like this before) and therefore I have no idea how scared should I be or what else should I look for. Can anyone give me a hint what my actions should be in such situation?

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• How to Change the Kerberos Default Ticket Lifetime

  - by user40497

  Our KDC servers are running either Ubuntu Dapper (2.6.15-28) or Hardy (2.6.24-19). The Kerberos software is the MIT implementation of Kerberos 5. By default, a Kerberos ticket lasts for 10 hours. However, we'd like to increase it a bit (e.g. 14 hours) to suit our needs better. I had done the following but the ticket lifetime still stays at 10 hours: 1) On all the KDC servers, set the following parameter under [realms] in /etc/krb5kdc/kdc.conf and restarted the KDC daemon: max_life = 14h 0m 0s 2) Via "kadmin", changed the "maxlife" for a test principal via "modprinc -maxlife 14hours ". "getprinc " shows that the maximum ticket life is indeed 14 hours: Maximum ticket life: 0 days 14:00:00 3) On a Kerberos client machine, set the following parameters under [libdefaults], [realms], [domain_realm], and [login] in /etc/krb5.conf (everywhere basically since nothing I tried had worked): ticket_lifetime = 13hrs default_lifetime = 13hrs With the above settings, I suppose that the ticket lifetime would be capped at 13 hours. When I do "k5start -l 14h -t ", I see that the end time for the "renew until" line is now 14 hours from the starting time: Valid starting Expires Service principal 04/13/10 16:42:05 04/14/10 02:42:05 krbtgt/@ renew until 04/14/10 06:42:03 "-l 13h" would make the end time in the "renew until" line 13 hours after the starting time. However, the ticket still expires in 10 hours (04/13 16:42:05 - 014/14 02:42:05). Am I not changing the right configuration file(s)/parameter(s), not specifying the right option when obtaining a Kerberos ticket, or something else? Any feedback is greatly appreciated! Thank you!

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• Windows product key is valid but wont activate

  - by pnongrata

  Last month, I needed to install Windows XP (Pro Version 2002 SP3) from a Reinstallation CD a co-worker gave me, and with a product key the IT team told me to use. Everything installed successfully and I have been using the XP machine for the last 30 days without any problems; however it kept reminding me to activate Windows, and of course, I never did (laziness). It now has me locked out of my machine and won't let me log in until I activate it. So I proceed to the Activation Screen which asks me: Do you want to activate Windows now? I choose "Yes, let's activate Windows over the Internet now.", and click the Next button. It now asks me: Do you want to register while you are activating Windows? I choose "No, I don't want to register now; let's just activate Windows.", and click the Next button. I now see the following screen: Notice how the title reads "Unauthorized product key", and how there are only 3 buttons: Telephone Remind me later Retry Please note that the Retry button is disabled until I enter the full product key that IT gave me, then it enables. However, at no point in time do I see a Next button, indicating that the product key was valid/successful. So instead, I just click the Retry button, and the screen refreshes, this time with a different title Incorrect product key Could something be wrong with the Windows XP reinstallation CD (do they "expire" after a certain amount of time, etc.)? Or is this the normal/typical workflow for what happens when you just have a bad product key? I ask because, after this happened I emailed IT and they supplied me whether several other product keys to try. But every time its the same result, same thing happening over again and again. So I guess it's possible that IT has given me several bad keys, but it's more likely something else is going on here. Any thoughts or ways to troubleshoot? Thanks in advance!

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• 2008 Sever Randomly reboots.

  - by Jeff

  I'm out of ideas here. We have a 2008 Server that keeps rebooting 2-3 times a day at completely random times with an "Unexpected Shutdown" event. There are no Dumps, no events leading to it just like it loses power then comes back online. I ran a Diagnostic of the power supply and it has had continuous power for months. In addition, the temperature of the processors are maxing out at 40 degrees Celsius. Anyone have any ideas how to figure out why this is restarting all the time? This is a DMZed Web server so it doesn't do too much process wise. Here are the specs: Host Name: ~~~ OS Name: Microsoft Windows Server 2008 R2 Standard OS Version: 6.1.7600 N/A Build 7600 OS Manufacturer: Microsoft Corporation OS Configuration: Standalone Server OS Build Type: Multiprocessor Free Registered Owner: Windows User Registered Organization: Product ID: ~~~ Original Install Date: 5/27/2010, 4:25:47 PM System Boot Time: 2/14/2011, 5:35:01 PM System Manufacturer: HP System Model: ProLiant DL380 G6 System Type: x64-based PC Processor(s): 1 Processor(s) Installed. [01]: Intel64 Family 6 Model 26 Stepping 5 GenuineIntel ~1586 Mhz BIOS Version: HP P62, 8/16/2010 Windows Directory: C:\Windows System Directory: C:\Windows\system32 Boot Device: \Device\HarddiskVolume1 System Locale: en-us;English (United States) Input Locale: en-us;English (United States) Time Zone: (UTC-05:00) Eastern Time (US & Canada) Total Physical Memory: 4,086 MB Available Physical Memory: 2,775 MB Virtual Memory: Max Size: 8,170 MB Virtual Memory: Available: 6,691 MB Virtual Memory: In Use: 1,479 MB Page File Location(s): C:\pagefile.sys

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• Win2k8R2 / IIS 7.5 - users getting 503 response, no 503 error reported in logs

  - by merk

  I've got 2 web servers with mirrored content. There's a load balancer sitting in front of them. Starting yesterday we've been getting people complaining about 503 errors. i can't find any 503 errors in the IIS log file. However the server host is saying these errors are due to .Net errors in our website which are causing the app pool to recycle. They pointed out several errors in the windows application event log which look like this: Log Name: Application Source: ASP.NET 4.0.30319.0 Date: 3/31/2012 8:35:37 PM Event ID: 1309 Task Category: Web Event Level: Warning Keywords: Classic User: N/A Computer: 6251.local Description: Event code: 3005 Event message: An unhandled exception has occurred. Event time: 3/31/2012 8:35:37 PM Event time (UTC): 4/1/2012 1:35:37 AM Event ID: e7a580c7b38545cca3416a8595408f24 Event sequence: 97 Event occurrence: 1 Event detail code: 0 Application information: Application domain: /LM/W3SVC/2/ROOT-1-129777167518960645 Trust level: Full Application Virtual Path: / Application Path: C:\inetpub\wwwroot\mywebsite\ Machine name: 6252 Process information: Process ID: 20000 Process name: w3wp.exe Account name: IIS APPPOOL\MyAppPool In particular they are saying that the account name under Process Information indicates that the app pool is recycling. They said if the app pool were not recycle, the accountname would instead be the folder where the website files are located. I checked the app pool settings - it's set to recycle every 29 hours. And the rapid fail protection is set to the default of 5 failures in 5 minutes. But i have not seen 5 failures in the event log in that short of a time span. Can anyone help me confirm if the 503 responses are indeed being generated by the app pools recycling? Or are these errors coming from somewhere else? My guess at the time was their load balancer was the one actually returning the 503 error. But that was just a guess.

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• Nagios command not transmitting all arguments

  - by markus

  I'm using the following service to monitor our postgres db from nagios: define service{ use test-service ; Name of servi$ host_name DEMOCGN002 service_description Postgres State check_command check_nrpe!check_pgsql!192.168.1.135!test!test!test notifications_enabled 1 } On the remote machine I've configured the command: command[check_pgsql]=/usr/lib/nagios/plugins/check_pgsql -H $ARG1$ -d $ARG2$ -l $ARG3$ -p $ARG4$ In the syslog I can see that command is executed, but there is only one argument transmitted: Oct 20 13:18:43 DEMOSRV01 nrpe[1033]: Running command: /usr/lib/nagios/plugins/check_pgsql -H 192.168.1.134 -d -l -p Oct 20 13:18:43 DEMOSRV01 nrpe[1033]: Command completed with return code 3 and output: check_pgsql: Database name is not valid - -l#012Usage:#012check_pgsql [-H <host>] [-P <port>] [-c <critical time>] [-w <warning time>]#012 [-t <timeout>] [-d <database>] [-l <logname>] [-p <password>] Oct 20 13:18:43 DEMOSRV01 nrpe[1033]: Return Code: 3, Output: check_pgsql: Database name is not valid - -l#012Usage:#012check_pgsql [-H <host>] [-P <port>] [-c <critical time>] [-w <warning time>]#012 [-t <timeout>] [-d <database>] [-l <logname>] [-p <password>] Why are arguments 2,3 and 4 missing?

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• Why are Microsoft Windows Update taking so long to install?

  - by Mathieu Pagé

  Hi, I have a question that is not related to a problem I have. Just something I'd like to understand. Why are Windows update so long? First Windows Update need to find witch updates you needs and this take about 5 minutes. What is happening behind the scene during those 5 minutes? I would have tought that it would be enough to compare the updates you already have to the complete list of updates or to check the version numbers of a couples files. Then when it comes time to install the upgrades, they're also taking a long time. Some 1 Mb updates takes 2, 3 or 5 minutes to install. What is taking so long. I would have though that it was simply a mater of backup the old file, uncompress the new files, replace the old file. This should be really fast. Is Windows doing something else? For comparison, under Linux, you can find which updates you need in about 20 seconds and installing them is usually pretty fast (The time to uncompress the files). I can do a complete updgrade of my linux machine in about 25 minutes (download 600-800 Mb of updates, hundreds of them and install them) while under windows 25 minutes is the time it needs to find witch update are needed and install about 5-10 updates. I just updated a Windows XP home from SP1a to SP3 + all other updates. It took me more than 3 hours. Doing something like that in the Linux World takes about 30 minutes. I don't want to bash Microsoft here. I genuinly want to know what they do differently that makes it so long.

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• MS licensing of multiple RDP sessions for non-MS products in Windows XP Pro

  - by vgv8

  Question 1) and 2) were moved into separate thread Which Windows remote connections bypass LSA? and what r definitions of login vs. logon session? 3) Do I understand correctly that multiple remote RDP sessions are supported by Windows XP but require additional (or modified) licensing? Which one? Or it is always illegal to run multiple RDP sessions on Windows XP? even through non-MS commercial software? ---------- Update1: I already understood my error - the main questions were about definitions (important to find the common language with others) and the licensing questions were collateral - but it was already answered. I shall try to separate these questions leaving here the questions about RDp licensing and migrating other questions into separate thread ---------- Update2: Trying to "work around" licensing terms is pointless and wasteful of time I never try "working around" and I never ask anything like this, I am not specialist in licensing. My clients/employers provide me with tools and licensing support. They have corporate lawyers, planning/accounting/purchase departments for these issues. The questions that I ask is the matter of scalability and efficiency (saving my and others time) in my developing work. For ex., Just because I need autentication against Windows AD it is time-saving to use ADAM instead of deploying full-fledged AD with DC + servers + whatever else? Nobody is forcing you to use Windows XP I shall not rush into re-installing all my operating systems on all my development machines (at home, at client premises) just because a few guys have a lot of fun downvoting development-related questions in serverfault.com. If I do so, I make a joker from me in the eyes of my clolleagues et al Update: I unmarked this question as answered since it had not even adressed the question, at least mine. Should I understand that Terminal Server PRO, allowing Windows® XP and Windows® Small Business Server 2003 to host multiple remote desktop sessions, is illegal? Related: My answer to question Has windows XP support multiple remote login session (RDP) at a time?

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• DL380 G7: Not able to access ILO on DL380 via ssh from a client

  - by user117140

  I have problem where I can't access my ILO(ssh to ILO IP) thru client which is in different network.I am able to ping ILO IP thru this clinet but ssh access is not possible. Is it possible to have ssh to ILO IP from a client which is in different network? FYI, from the same client I can do ssh to server application IP but ssh to this server ILO IP is not possible. Kindly help? Some more info added: ILO IP address is 10.247.172.70 and its VLAN is different than Client VLAN. Client IP address is 10.247.167.80. ping to ILO IP from this client is possible but not ssh. I can do ssh to ILO IP if I try to do it from the server(hostname:node1) having ILO port or from the other node of this cluster itself,So ssh login is enabled. [root@node1 ~]$ssh -v 10.247.173.70 OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to 10.247.173.70 [10.247.173.70] port 22. [root@node1 ~]$ping 10.247.173.70 PING 10.247.173.70 (10.247.173.70) 56(84) bytes of data. 64 bytes from 10.247.173.70: icmp_seq=1 ttl=254 time=0.283 ms 64 bytes from 10.247.173.70: icmp_seq=2 ttl=254 time=0.344 ms 64 bytes from 10.247.173.70: icmp_seq=3 ttl=254 time=0.324 ms 64 bytes from 10.247.173.70: icmp_seq=4 ttl=254 time=0.367 ms

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• Mac OS X - configuring ntpd server with on LAN with D-Link DIR-655

  - by Mark C

  Hey all, This question is pretty specific, but I hope someone will have seen this error elsewhere. I a configuring a machine running OS X 10.5.8 to be an NTP server for machines connected to a LAN that is not connected to the Internet. I am not too worried about knowing the "right" time on all the machines, but rather worried about making sure everyone has the same notion of time. I configured the NTP daemon on Mac by turning on the Set date and time automatically in System Preferences, using the server's clock, 127.127.1.0 as the reference clock. I figured I should see if the server can NTP query itself before proceeding to the clients. The weird part is when I run the ntpq -p command in a command-prompt when connected to my D-Link DIR-655 (firmware: 1.33), it hangs for about a minute or so each time before finally giving me some output. I thought the problem might have to do with Port Forwarding, so I configured the router to forward port 123 for the IP of the server, but that did not improve the situation. When I run the ntpq -p command on my school's network, on a Linksys WRT54G router, or with the wireless Airport card turned off - I have absolutely no problems - the command returns a response instantly. Is this normal? I can see why a query might take a minute or so, but I don't understand why one router does it faster than the other. I tried messing around with the ntp.conf file adding the burst, minpoll, and maxpoll options: server 127.127.1.0 burst minpoll 4 maxpoll 5 Figuring that perhaps I am polling too often and the configuration file is slowing me down, but even with this, the ntpq still hangs on the D-Link DIR-655, but does just fine on the other routers. Any thoughts on where the lag is coming from or if the lag is even a problem?

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