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• High data on recv-q buffer and thread lock on java.io.BufferedInputStream in linux

  - by Sagar Patel

  We have a java application running on linux (ubuntu server). We have been facing high recv-q problem since quite some time. Application gets hang and does not read data from socket every few hours. In thread dump, we have found below stack trace. "Receiver-146" daemon prio=10 tid=0x00007fb3fc010000 nid=0x7642 runnable [0x00007fb5906c5000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream. socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:150) at java.net.SocketInputStream.read(SocketInputStream.java:121) at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at java.io.BufferedInputStream.read1(BufferedInputStream.java:275) at java.io.BufferedInputStream.read(BufferedInputStream.java:334) - locked <0x00000007688f1ff0> (a java.io.BufferedInputStream) at org.smpp.TCPIPConnection.receive(TCPIPConnection.java:413) at org.smpp.ReceiverBase.receivePDUFromConnection(ReceiverBase.java:197) at org.smpp.Receiver.receiveAsync(Receiver.java:351) at org.smpp.ReceiverBase.process(ReceiverBase.java:96) at org.smpp.util.ProcessingThread.run(ProcessingThread.java:199) at java.lang.Thread.run(Thread.java:722) We are not able to trace the exact reason behind this? Kindly help. We are using 16 core machine and load on the system is around 30-40 at the time of issue. We use command ss dst <ip> to find out recv-q. Recently we have been facing issues with recv-q size getting hung, were in receive buffer gets stuck at some point of time. But recvQ size is not decreasing and as a result we are losing a lot of hits from the other side, our application is not accepting any data.

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• Amavisd-new(2.6.4-3) failing to do "lookup_sql_dsn" when large number of emails are need to be accessed

  - by sandip

  Amavis is failing to do sql lookup when large number of emails are sent to amavis. Its throwing out error after scanning 40 to 50 email. It shows error like. (!!)TROUBLE in process_request: sql exec: err=7, 57P01,DBD::Pg::st bind_param failed:FATAL: terminating connection due to administrator command\nSSL connection has been closed unexpectedly at (eval 103) line 164, <GEN50> line 5. at (eval 104) line 280, <GEN50> line 5. As soon as this error appears in the logs, Amavis stops and port 10024 is closed. Thinking it to an error due to ssl connection in the database(postgresql-8.4), i had stopped ssl in postgres, but it was of no use. I have tried to configure amavis on another server, but i got the same error again. This happening on a production server, So i am not being able to scan emails as per user settings. Anybody have any idea, what may be the source of this error ?? Please help. Thanks in advance

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• pdns-recursor allocates resources to non-existing queries

  - by azzid

  I've got a lab-server running pdns-recursor. I set it up to experiment with rate limiting, so it has been resolving requests openly from the whole internet for weeks. My idea was that sooner or later it would get abused, giving me a real user case to experiment with. To keep track of the usage I set up nagios to monitor the number of concurrent-queries to the server. Today I got notice from nagios that my specified limit had been reached. I logged in to start trimming away the malicious questions I was expecting, however, when I started looking at it I couldn't see the expected traffic. What I found is that even though I have over 20 concurrent-queries registered by the server I see no requests in the logs. The following command describes the situation well: $ sudo rec_control get concurrent-queries; sudo rec_control top-remotes 22 Over last 0 queries: How can there be 22 concurrent-queries when the server has 0 queries registered? EDIT: Figured it out! To get top-remotes working I needed to set ################################# # remotes-ringbuffer-entries maximum number of packets to store statistics for # remotes-ringbuffer-entries=100000 It defaults to 0 storing no information to base top-remotes statistics on.

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• Servers/Websites Keep Going Down

  - by Tyler Johnson

  Okay, I'm a noobie. I know how to build and compose a website, but I have no idea what I'm doing when it comes to servers and server commands, etc. I've recently had a problem with all of my sites on our servers going down all at once and then I have to go in and reboot the server for them to come up again. At first this was annoying, but now it is becoming agonizing as it now takes 3-4 reboots for the websites to come back up. I contacted support for my hosting, but they are not being very helpful. They just keep telling me what the issue might be and basically telling me that I'm going to have to look into it and figure it out, which really isn't possible since I know nothing. Anyway, here are the things they said were possible reasons: They said I have "strange logs" in my Apache webserver log, error: sh: fetch: command not found. My php.ini memory limit is: 256M which is very high. It should be 32M or 64M. Server is reaching Max Clients, meaning we have more than 150 visitors at a time. (They supposedly "fixed" this, but the sites/server are still going down) I have some Wordpress sites with plugins getting errors like: PHP Warning: pack(): Type H: illegal hex digit G in... PHP Fatal error: Cannot use object of type stdClass as array in... PHP Fatal error: Maximum execution time of 30 seconds exceeded in... PHP Fatal error: Call to undefined function file_exists() in... PHP Parse error: syntax error, unexpected '<' I know that's a lot, but I really am at wits end and have no idea what to do now. If anyone could maybe give me some advice or point me in the right direction I would greatly appreciate it! Thanks! Oh, and here are the specs for my server: RAM: 2048MB CPU Shares: 40 Primary Disk: 50GB Data Transfer: 75GB Port Speed: 5Mbps Type: Linux

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• Extracting information from active directory

  - by Nop at NaDa

  I work in the IT support department of a branch of a huge company. I have to take care of a database with all the users, computers, etc. I'm trying to find a way to automatically update the database as much as possible, but the IT infrastructure guys doesn't give me enough privileges to use Active Directory in order to dump the users, nor they have the time to give me the information that I need. Some days ago I found Active Directory explorer from Sysinternals that allows me to browse through Active Directory, and I found all the information that I need there (username, real name, date when it was created, privileges, company, etc.). Unfortunately I'm unable to export the data to a human readable format. I'm just able to take a snapshot of the whole database in a machine-readable format. Doing the snapshot takes hours and I'm afraid that the infrastructure guys won't like me doing entire snapshots on a regular basis. Do you know of any tool (command-line is preferable) that would allow me to retrieve the values of the keys or export it to XML, CSV, etc?

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• ssh hangs on "Last login" line

  - by Pavel H

  This happened for the first time three days ago - I ssh to the server, authenticate using a password, get the welcome message but it remains hanging on the "Last login:..." line. The command line doesn't show and the server doesn't react to my input. Other services on the server keep working ok (apache, tomcat, database, ..). The box has an out-of-band management using which I was able to restart it. After the restart the ssh worked ok again and I didn't find anything suspicious in the logs. Three days later the same problem occurs on this box again, and newly on yet another server in the cluster - 100% same symptoms. Both servers have about 2 month old installation of Debian Squeeze (6.0.2) and the problem never occurred before despite frequent ssh-ing, so it should not be a problem of settings. We haven't been installing anything new for quite some time now. I also made sure there is enough disk space on both servers. Since it started to happen all of a sudden on two servers at about the same time, I suspect some bug may have been introduced via Debian updates, yet I haven't been able to find anyone with the same problem. Most similar issues I have found: ssh freezes at the "Last Login Line" - in our case everything worked fine until recently, so nothing related to settings should be our problem. Diskspace checked, I couldn't check the memory but I would expect something would be in the logs if the system had been running out of it. Remote Fedora system unresponsive, odd but consistent behavior when trying to log in - problem with high load on the server; unlike in this case, nothing changes even if I wait for 10+ minutes

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• Deploying multiple identical copies of a virtual machine for compute tasks

  - by Reid

  I have a compute task which has a large number of library dependencies. I would like to deploy it on some of my company's large Linux clusters, where I do not have root. I could probably track down, compile, and install the right versions of all the libraries, but this looks to be quite tedious and would have to be repeated if I deployed it again somewhere else. On the other hand, it's pretty easy to install on current Ubuntu. This led me to wonder about a virtual machine approach. Could I put together a virtual machine which booted up, ran the computation (with parameters from and results to the host), and then shut down? In other words, I'd like a command like this that I could run on the host: $ ./run-vm --ram N --task /path/on/host/foo.sh --results /another/host/dir/ This would boot the VM, run foo.sh, and put the (relatively small) results of the computation in /another/host/dir/. It's important to start up many instances of the VM simultaneously, both on a single node and multiple nodes of the cluster. So it would be nice if I didn't have to make many copies of the VM virtual disk and metadata. As the task instances are completely independent, the VMs would not need any network support once deployed, or any outside communications beyond reading and writing the host filesystem. Is this possible, and if so, how might I go about doing it? Are there assumptions I've made above which are bogus?

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• FreeBSD: problem with Postfix after updating LDAP

  - by Olexandr

  At the server I installed openldap-server, at this computer open-ldap client has already been installed. Version of openldap-client (2.4.16) was older then new openldap-server (2.4.21) and the version of client has updated too. OpenLDAP-client works with postfix on this server and after all updates postfix cann't start again. The error when postfix stop|start is: /libexec/ld-elf.so.1: Shared object "libldap-2.4.so.6" not found, required by "postfix" At the category with libraries is libldap-2.4.so.7, but libldap-2.4.so.6 is removed from the server. When I want to deinstall curently version of openldap-client, system write ===> Deinstalling for net/openldap24-client O.K., but when I start "make install" system write: ===> Installing for openldap-sasl-client-2.4.23 ===> openldap-sasl-client-2.4.23 depends on shared library: sasl2.2 - found ===> Generating temporary packing list ===> Checking if net/openldap24-client already installed ===> An older version of net/openldap24-client is already installed (openldap-client-2.4.21) You may wish to ``make deinstall'' and install this port again by ``make reinstall'' to upgrade it properly. If you really wish to overwrite the old port of net/openldap24-client without deleting it first, set the variable "FORCE_PKG_REGISTER" in your environment or the "make install" command line. *** Error code 1 Stop in /usr/ports/net/openldap24-client. *** Error code 1 Stop in /usr/ports/net/openldap24-client. Updating of ports doesn't help, and postfix writes error: /libexec/ld-elf.so.1: Shared object "libldap-2.4.so.6" not found, required by "postfix"

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• Size of modules within initrd

  - by LiKao

  I am currently trying to manually replace the kernel within ubuntu-core on an embedded device with a custom kernel. However when I try to update the initrd my initrd becomes much bigger. Here is what I did: Extract the initrd that was shipped with ubuntu Make a list of all modules within the old initrd get the same modules from the new module director at /lib/modules/new_kernel_version add these modules to the initrd and remove the old ones If I do this my initrd becomes quite bigger than the original one, so I checked the individual modules. I picked the btrfs.ko filesystem driver as an example. So by comparing these two modules I noticed the one I just picked into the initrd was much bigger, which caused the difference in size. -rw-r--r-- 1 root root 999K Nov 14 15:06 btrfs.ko For the btrfs.ko within the shipped initrd. -rw-r--r-- 1 root root 7.2M Nov 14 15:08 btrfs.ko For the new btrfs.ko. What is different between these two modules? Could this be caused by some faulty setting for the new kernel? When producing the kernel I copied /proc/config.gz and used make oldconfig to update it, so all optimisations should be the same for both kernels. Or is there something else which is being done to the modules before they are put into the initrd? Maybe is there even some better way to build a new initrd for the new kernel in ubuntu altogether. Update: I just also tested with an initrd which I created from scratch using the mkinitrfs command within ubuntu, and it has the same size difference that I found for the initrd I manually updated.

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• MySQL stopped asking for passwords

  - by BlaM

  I'm currently experiencing a weird problem with one of my MySQL database servers: It stopped asking for passwords when I try to access the database from local with the mysql command line tool. I need a valid admin username. I also still need a password for remote access (i.e. from another IP). And I need a password when I - for example - access the database from a PHP script. But when I try to access the database from local host/commandline it will let me straight in to the data with my administrative users. They (admin users) have passwords set - and as I mentioned - I still need to specify those when I try to access the data via PHP. Changing the password didn't help. Non-Administrative users need to specify their passwort, but that doesn't really help if they can get anywhere with "mysql -u root" (or another admin user account name). (System Debian Linux Lenny, MySQL 5.0.51a) Any ideas? Anything that explains this behaviour? I don't understand how this can happen.

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• Server-side SSH jump hosts

  - by Dan Sosedoff

  Trying to figure out server side SSH jump hosts logic. Current network schema: [Client] <--> [Server A: hostname: a.com] <--> [Server B] [Client] <--> [Server A: hostname: b.com] <--> [Server C] Server A responds to both DNS records. Possible flow: Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically jump user onto Server B with ssh user2@server_b.com. Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically just user onto Server C with ssh user2@server_c.com. In other words, client should be able to connect to the target without performing any local configuration, assuming that we have a stock ssh config. The problem with ssh jumps is that user has to define hosts in local ~/.ssh/config file, which is not acceptable in my case. It needs to be a default sshd behavior. Im aware that you can define a custom command ~/.ssh/authorized_keys on server, but i dont think there is a way to properly detect source hostname where user tries to connect. It is possible at all ?

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• OpenVPN - Cannot browse ipv4 websites

  - by user1494428

  I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is I can only browse websites which support ipv6 like google. http://whatismyv6.com/ reports me that I've an ipv6 adress, so I guess this is the problem. Server configuration: dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/easy-rsa/keys/server.key dh /etc/openvpn/easy-rsa/keys/dh1024.pem push "route 10.8.0.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" push "redirect-gateway def1" comp-lzo persist-tun persist-key status openvpn-status.log log /var/log/openvpn.log verb 3 Client configuration: client remote xx.xx.xx.xx 1194 dev tun comp-lzo ca ca.crt cert client1.crt key client1.key redirect-gateway def1 verb 3 I have configured NAT with this command: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to xx.xx.xx.xx Can someone explain me how I can make it works (forcing ipv4?) I had the same problem with another vps and I also tried on another client (All Windows 7).

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• How to reduce celeryd memory consumption?

  - by Gringo Suave

  I'm using celery 2.5.1 with django on a micro ec2 instance with 613mb memory and as such have to keep memory consumption down. Currently I'm using it only for the scheduler "celery beat" as a web interface to cron, though I hope to use it for more in the future. I've noticed it is the biggest consumer of memory on my micro machine even though I have configured the number of workers to one. I don't have many other options set in settings.py: import djcelery djcelery.setup_loader() BROKER_BACKEND = 'djkombu.transport.DatabaseTransport' CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler' CELERY_RESULT_BACKEND = 'database' BROKER_POOL_LIMIT = 2 CELERYD_CONCURRENCY = 1 CELERY_DISABLE_RATE_LIMITS = True CELERYD_MAX_TASKS_PER_CHILD = 20 CELERYD_SOFT_TASK_TIME_LIMIT = 5 * 60 CELERYD_TASK_TIME_LIMIT = 6 * 60 Here's the details via top: PID USER NI CPU% VIRT SHR RES MEM% Command 1065 wuser 10 0.0 283M 4548 85m 14.3 python manage_prod.py celeryd --beat 1025 wuser 10 1.0 577M 6368 67m 11.2 python manage_prod.py celeryd --beat 1071 wuser 10 0.0 578M 2384 62m 10.6 python manage_prod.py celeryd --beat That's about 214mb of memory (and not much shared) to run a cron job occasionally. Have I done anything wrong, or can this be reduced about ten-fold somehow? ;) Update: here's my upstart config: description "Celery Daemon" start on (net-device-up and local-filesystems) stop on runlevel [016] nice 10 respawn respawn limit 5 10 chdir /home/wuser/wuser/ env CELERYD_OPTS=--concurrency=1 exec sudo -u wuser -H /usr/bin/python manage_prod.py celeryd --beat --concurrency=1 --loglevel info --logfile /var/tmp/celeryd.log Update 2: I notice there is one root process, one user child process, and two grandchildren from that. So I think it isn't a matter of duplicate startup. root 34580 1556 sudo -u wuser -H /usr/bin/python manage_prod.py celeryd wuser 577M 67548 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 578M 63784 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 271M 76260 +- python manage_prod.py celeryd --beat --concurrency=1

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• what means parameter -mailboxcredenctial

  - by cotablise

  H3llo, I am writing regarding the Exchange powershell commands. When I want to use following cmdlets, I have to insert parameter -mailboxcredential Test-OwaConnectivity Test-OutlookWebServices Test-ImapConnectivity Test-PopConnectivity In the Microsoft official site is written: "The MailboxCredential parameter specifies the mailbox credential for a single URL test." I am not sure why this parameter is needed... I inserted incorrect credentials, however the command was finished successfully... Could you tell me reason why this parameter is needed ? Example: Wrong/incorrect credential [PS] C:\>Test-WebServicesConnectivity -ClientAccessServer EXhub1 -MailboxCredential (Get-Credential blablabla) CasServer LocalSite Scenario Result Latency(MS) Error --------- --------- -------- ------ ----------- ----- EXhub1 Default-Fi... GetFolder Failure [System.Net.WebExcept... Without parameter: [PS] C:\>Test-WebServicesConnectivity -ClientAccessServer EXhub1 WARNING: Test user 'extest_91ef41d34eef4' isn't accessible, so this cmdlet won't be able to test Client Access server connectivity. Could not find or sign in with user ********\extest_91ef41d34eef4. If this task is being run without credentials, sign in as a Domain Administrator, and then run Scripts\new-TestCasConnectivityUser.ps1 to verify that the user exists on Mailbox server EXHUB1.****** + CategoryInfo : ObjectNotFound: (:) [Test-WebServicesConnectivity], CasHealthCouldN...edInfoException + FullyQualifiedErrorId : FB9A14B6,Microsoft.Exchange.Monitoring.TestWebServicesConnectivity WARNING: No Client Access servers were tested. Thank you in advance

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• Chrome Lockups Windows 7 64-bit

  - by Mike Chess

  I'm running Google Chrome (6.0.427.0 dev) on Windows 7 Home Premium 64-bit (AMD Phenom 3.00 GHz, 8 GB RAM). The computer lockups hard after running Chrome for about five minutes. The lockup happens whether Chrome is actually being used to browse web sites or it is just idling. No programs can be started or interacted with when this happens. The computer must be power-cycled to recover. The lockup happens regardless of which web sites are being browsed. The system event logs do not show any events around the time when the lockup transpired. All other applications run just fine on this system. In fact, Chrome ran without issue for several months on this system (the system was brand new 03-2010). I also run the same version of Chrome on other computers (Windows XP SP3) without issue. I've come to really like Chrome and use it as my default browser whenever possible. What could be causing Chrome to cause the system to lockup as it does? Does Chrome have any logs that aren't part of the Windows event log? Does Chrome have a debug command line switch that might reveal more about what happens?

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• How can I start hostednetwork on Windows 7?

  - by Pirozek

  When I type in admin console command to start hostednetwork netsh wlan start hostednetwork it gives me this: The hosted network couldn't be started. The group or resource is not in the correct state to perform the requested operation. There is a hotfix from Microsoft but it didn't help me. Any advice? C:\Users\Pirozek>netsh wlan show driver Interface name: Wireless Network Connection 3 Driver : D-Link AirPlus DWL-G520 Wireless PCI Adapter(rev .B) Vendor : Atheros Communications Inc. Provider : Atheros Communications Inc. Date : 8.7.2009 Version : 8.0.0.171 INF file : C:\Windows\INF\oem108.inf Files : 2 total C:\Windows\system32\DRIVERS\athrx.sys C:\Windows\system32\drivers\vwifibus.sys Type : Native Wi-Fi Driver Radio types supported : 802.11b 802.11g FIPS 140-2 mode supported : Yes Hosted network supported : Yes Authentication and cipher supported in infrastructure mode: Open None Open WEP-40bit Shared WEP-40bit Open WEP-104bit Shared WEP-104bit Open WEP Shared WEP WPA-Enterprise TKIP WPA-Personal TKIP WPA2-Enterprise TKIP WPA2-Personal TKIP Vendor defined TKIP WPA2-Enterprise Vendor defined Vendor defined Vendor defined WPA-Enterprise CCMP WPA-Personal CCMP WPA2-Enterprise CCMP Vendor defined CCMP WPA2-Enterprise Vendor defined Vendor defined Vendor defined WPA2-Personal CCMP Authentication and cipher supported in ad-hoc mode: Open None Open WEP-40bit Open WEP-104bit Open WEP WPA2-Personal CCMP

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• In Windows 7, why won't my display stay off despite the power settings saying it should?

  - by Jer

  I'm completely stumped by this. My simple use case is that when I'm in bed, I use a cordless mouse to browse the web, watch videos, etc. - the monitor is across the room. When I'm going to sleep, I want to shut the monitor off. I also want to be able to turn it back on in the morning. I just want to turn the monitor off and on using only the mouse. I thought of creating a power setting that turned the monitor off asap (the shortest amount of time is one minute; that's fine). I have one that does this. It worked great for almost a year on my old XP machine, and for about four months on my new Windows 7 laptop (which I essentially use as a desktop). All of a sudden a couple weeks ago, it just stopped working - my monitor won't turn off on its own anymore. Here are the settings: I tried other options. Based on the advice here I tried nircmd. This seemed great. I created a shortcut with the command line: "C:\Program Files\nircmd\nircmd.exe" cmdwait 1000 monitor off I click this, and in one second the monitor goes off. However about five seconds later it turns back on, and I've been extra careful to make sure the mouse isn't moving. I have no idea what's going on. Based on both of these things, my only guess is that something could be running in the background which somehow makes the computer think it's in use. I've tried killing as many programs as possible but I still get the same behavior. Any advice? I'm mainly curious about how to debug, but am open to other suggestions about turning the monitor off and on with just the mouse as well.

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• Need help trying to allow my remote PowerShell script to run on my Windows 2008 r2 Server

  - by Pure.Krome

  I've got a Windows 2008 r2 server with Sql Server 2008 r2 installed. I've got a Sql Server Agent which tries to run a Powershell job, but fails :- Message Executed as user: FooServer\SqlServerUser. A job step received an error at line 1 in a PowerShell script. The corresponding line is '& '\\polanski\Backups\Database\7ZipFooDatabases.ps1'' Correct the script and reschedule the job. The error information returned by PowerShell is: 'File \\polanski\Backups\Database\7ZipFooDatabases.ps1 cannot be loaded. The file \\polanski\Backups\Database\7ZipFooDatabases.ps1 is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details.. '. Process Exit Code -1. The step failed. Ok. So i run Powershell on that server then set the execution policy to unrestricted. To check .. PS C:\Users\theUser> Get-ExecutionPolicy Unrestricted PS C:\Users\theUser> Kewl :) but it still doesn't work :( Ok ... what happens when i try to run the powershell from the command line.... PS C:\Users\justin.adler . '\polanski\Backups\Database\7ZipMotorshoutDatabases.ps1' Security Warning Run only scripts that you trust. While scripts from the Internet can be useful, this script can potentially harm your computer. Do you want to run \\polanski\Backups\Database\7ZipFooDatabases.ps1? [D] Do not run [R] Run once [S] Suspend [?] Help (default is "D"): er..... didn't I already tell the server that ANY file can be ran? Notice the file is located at... \\polanski\Backups\Database\ So can someone make any suggestions?

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• What LPR arguments do I need to print a 1400x800 pixel image on a 4x6 label?

  - by Nick

  This is driving me nuts. UPS sends our system a 1400x800 GIF image of a shipping label, which is supposed to fit nicely on a 4x6 page. Unfortunately, I can't seem to get the command line options right to make it happen. We're using an Eltron/Zebra 2844 with a network adapter, and printing from our Ubuntu 8.04 server using CUPS. We're using the correct drivers, and test pages print correctly. No matter what I try though, it insists on printing the UPS labels accross 6 pages, with a little bit of the label on each page, or way too small. I've tried a bazillion different lpr settings, most of them producing garbage. The closest I've gotten is this: lpr -P Eltron2844 -o natural-scaling=55 -o page-right=0 -o page-left=0 -o landscape -o media="4x6" ./1ZY437560399620027.gif but it causes the image to be too small on the page. It's about an inch too short, and there's a 1/2" margin on both sides. If I bump the scale up to 56, it explodes the image onto two pages, and squashes it. Any ideas?

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• Linux CentOS strange memory readings

  - by user2008937

  I am actually a young junior sys admin. I have a question - i am trying to understand how linux deals with memory... while playing around different monitoring programs I found some strange thing. When I run top on my laptop it shows me that FIREFOX process with pid 8778 takes 18,3% of memory (%MEM column). grep "MemTotal" /proc/meminfo Above command give me 1848336kb/1024 = 1805megs of memory (its ok - i have 2 gigs of ram). So if the firefox process takes 18,3% of MEM(according to tops %MEM column) then it takes 0.183 * 1805 which is approximately 325mb of memory. Quite a lot as for firefox... But well, in Linux there are lots of shared libraries that programs commonly uses (like famous libc). And those libraries are added to memory utilization of every process that uses it in the system, despite they are actually reading same file(single object in memory). So top may show too big mem utilization because of those shared libraries. Well, it is time to use PMAP which should show us the real mem utilization of process. But.. pmap -d $(pidof firefox) mapped: 983460K writeable/private: 757164K shared: 66416K so pmap shows that 983460/1024=993MB of memory is mapped to this process. It is in fact much bigger than mem utilization showed by top. Whats wrong here? How pmap can show more than top? even when top adds also the shared libraries (which in fact are single objects in memory) for each process that uses it? and pmap omits it? Regards Krzysztof

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• Use old raid drive as boot device without data loss

  - by Gabriel

  There were two disks in sw-raid. There were /dev/md1 as swap, /dev/md2 as boot and a /dev/md3 with ext4. The sw-raid was disabled by stopping and removing mdadm and then zeroing the superblock on each /dev/mdX partition with: sudo mdadm --zero-superblock /dev/sda1 sudo mdadm --zero-superblock /dev/sda2 sudo mdadm --zero-superblock /dev/sda3 In the disk that is the first boot device, I don't know if it's relevant, the system type of each partition was set back from fd to 82 or 83 with fdisk, /etc/fstab was updated, changing /dev/mdX to /dev/sdaX, and grub was reinstalled on the boot partition (/dev/sda2) with grub-instal. But the system wont boot. What else should I do to use this disk as the boot device without reinstall or data loss? Current output of fdisk Device Boot Start End Blocks Id System /dev/sda1 2048 33556480 16777216+ 82 Linux swap / Solaris /dev/sda2 * 33558528 34607104 524288+ 83 Linux /dev/sda3 34609152 3907027120 1936208984+ 83 Linux With it doesn't boot I mean that it stops in the grub console (with the grub> symbol). A ls command says: (hd0) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) (hd1) (hd1,msdos1) It's weird because hd1 was formatted with ext4...

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• Starting programs from terminal then exiting terminal exits started programs?

  - by sherrellbc

  I really was unsure how to phrase the question title. What I mean is that when I use the terminal to start a program, most of the time when the terminal is closed it also exits the programs started from it. Now this makes sense if we look at it from a hierarchical standpoint of the terminal being the parent process which spawns child processes, and any halt of the parent causes subsequent halting of the children as well. However, I've noticed this to not always be the case. For example, I downloaded Sublime Text Editor and created a symlink in PATH. I can start this program by issuing a sublime command from the terminal, but subsequent closure of the terminal program does nothing to sublime. However, other times either the child process that was started it also closed or it hangs up and causes problems. tl;dr: Is it always the case that programs started from a closed parent process will be closed when the parent is exited? And if so, is there way to start a program from the terminal and then close the terminal without exiting the started process? The whole point here is to start programs from the terminal so I do not overly-populate my desktop with symlinks.

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• Correct use of SMTP "Sender" header?

  - by Eric Rath

  Our web application sends email messages to people when someone posts new content. Both sender and recipient have opted into receiving email messages from our application. When preparing such a message, we set the following SMTP headers: FROM: [email protected] TO: [email protected] SENDER: [email protected] We chose to use the author's email address in the FROM header in an attempt to provide the best experience for the recipient; when they see the message in their mail client, the author is clear. To avoid the appearance of spoofing, we added the SENDER header (with our own company email address) to make it clear that we sent the message on the author's behalf. After reading RFCs 822 and 2822, this seems to be an intended use of the sender header. Most receiving mail servers seem to handle this well; the email message is delivered normally (assuming the recipient mailbox exists, is not over quota, etc). However, when sending a message FROM an address in a domain TO an address in the same domain, some receiving domains reject the messages with a response like: 571 incorrect IP - psmtp (in reply to RCPT TO command) I think this means the receiving server only saw that the FROM header address was in its own domain, and that the message originated from a server it didn't consider authorized to send messages for that domain. In other words, the receiving server ignored the SENDER header. We have a workaround in place: the webapp keeps a list of such domains that seem to ignore the SENDER header, and when the FROM and TO headers are both in such a domain, it sets the FROM header to our own email address instead. But this list requires maintenance. Is there a better way to achieve the desired experience? We'd like to be a "good citizen" of the net, and all parties involved -- senders and recipients -- want to participate and receive these messages. One alternative is to always use our company email address in the FROM header, and prepend the author's name/address to the subject, but this seems a little clumsy.

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• Sever 2008 R2 Powershell Script runs manually, but not as a scheduled task

  - by Aeisor

  I have a Powershell script that runs manually using the Powershell ISE; However, when run as a scheduled task using an administrator's credentials the task does not run with the expected results. The script: $request=new-object System.Net.WebClient $request.DownloadFile("...url...", "C:\path\to\file.csv") The administrator user has Full Control of both the script and the folder it is writing to. The url exists and responds in a reasonable time (<1s). If I run the task manually the status is 0x41301 ("Currently Running") until I eventually end it. I have set the task up using both of these methods: Start a Program: C:\path\to\PS.PS1 Start a Program: C:\windows\system32\WindowsPowerShell\v1.0\powershell.exe with additional options -noninteractive -command "C:\path\to\PS.PS1" Using option 1, the task history shows it has opened an instance of notepad.exe but never terminates it. Using option 2 it completes the task but doesn't download / create the file. I have used Set-ExecutionPolicy Unrestricted as this is not a signed script. Any ideas?

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• Terminal is not letting me make commands unless I hit enter a bunch of times

  - by ninja08

  Whenever I open terminal it normally allows me to immediately begin making commands. Only earlier today I did the setup for github here https://help.github.com/articles/set-up-git And then all of a sudden the thing where I give terminal commands won't allow me to give it commands unless I hit enter a few times. This is what it looks like: Last login: Fri Nov 9 11:43:28 on ttys001 mysql.save: Permission denied mysql.save: Permission denied /Users/Nick/.zshrc:32: command not found:  . ~ git: ? ~ git: ? ~ git: ? See the big space? That's because it simply will never show the ~ git: thing unless I hit enter 3-4 times. Also, it never used to say ~ git: before I did the git setup. I'm not sure what I changed. I've checked the zshrc file and commented everything out to find the line causing the problem. I've done that and it turns out it was the source $ZSH/oh-my-zsh.sh Within the oh-my-zsh.sh file I've commented out each block of code for the file starting at the top and I've found that this block is causing it: # Load the theme if [ "$ZSH_THEME" = "random" ] then themes=($ZSH/themes/*zsh-theme) N=${#themes[@]} ((N=(RANDOM%N)+1)) RANDOM_THEME=${themes[$N]} source "$RANDOM_THEME" echo "[oh-my-zsh] Random theme '$RANDOM_THEME' loaded..." else if [ ! "$ZSH_THEME" = "" ] then if [ -f "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" ] then source "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" else source "$ZSH/themes/$ZSH_THEME.zsh-theme" fi fi fi

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