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• Laptops with easy heat sink service?

  - by Niten

  Can you recommend a current laptop model with easy heat sink access – or better yet, a removable air intake filter – making it easy to periodically clean out the dust and lint that always packs up in these things? Every laptop I've owned has eventually overheated on account of a clogged heat sink. (I suppose it doesn't help that I have a cat who loves to hang out where I'm working, or that my laptop is almost always running.) One of the things I really love about my current system, a Dell Inspiron 1420n, is how easy it is to service its cooling system: whenever I notice the fan starting to work harder and the CPU temperature climbing higher than it should be, I merely have to unscrew a single panel from the bottom of the machine, clean out the heat sink, and then I'm good for another few months. Which current models of the "business laptop" variety offer similar easy cooling system service? I'm looking for something roughly along the lines of: 14- or 15-inch display Nehalem-based CPU Solid construction – magnesium chassis or better (like the Inspiron) TPM (for BitLocker) ideal, but not mandatory Docking adapter ideal, but not mandatory Good battery life For example, the ThinkPad T410 would have been my top choice, but it seems like it would be a serious chore to service its heat sink. For the current MacBook Pros it looks downright impossible. No matter how nice the laptop is in other respects, it'll be of no use to me when it's overheating. So, any suggestions? Thanks in advance... (I'm constantly surprised that customers and manufacturers don't pay more attention to this feature, at least in the business laptop subcategory. In the last couple months I've fixed two friends' laptops which were also overheating due to clogged cooling systems; clearly I'm not the only one affected by this.)

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• pam debugging "check pass; user unknown"

  - by lvc

  I am attempting to get Prosody authenticating with its auth_pam module. It is configured to use the pam service name xmpp. The pam.d/xmpp file is copied straight from the one configured for dovecot (originally taken from, I think, dovecot's documentation), which is known to be working: # cat /etc/pam.d/xmpp auth required pam_unix.so nullok debug account required pam_unix.so debug Logging in with dovecot works wonderfully. Logging in with prosody, with exactly the same username and password, causes Prosody to return 'Not authorized', and the following in journalctl -f: Oct 29 22:12:14 riscque.net prosody[9396]: c2s1d010b0: Client sent opening <stream:stream> to riscque.net Oct 29 22:12:14 riscque.net prosody[9396]: c2s1d010b0: Sent reply <stream:stream> to client Oct 29 22:12:14 riscque.net prosody[9396]: [178B blob data] Oct 29 22:12:14 riscque.net unix_chkpwd[9408]: check pass; user unknown Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): conversation failed Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): unable to obtain a password Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): auth could not identify password for [lvc] Oct 29 22:12:14 riscque.net prosody[9396]: riscque.net:saslauth: sasl reply: <failure xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><not-authorized/><text>Unable to authorize you with the authentication credentials you&apos;ve sent.</text></failure> This series of errors seems mutually contradictory - first it says "user unknown", but then that it can't obtain the password for lvc - this username certainly exists on the system. What is likely going on here, and how would I debug this further?

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• Adding PHP to Apache

  - by user528451

  Where I work, we use ancient technology that belongs in a museum. Further I have to get everything done through system admins. They are telling me in order to get PHP, they will need to upgrade the operating system as well as the Apache version. lcas100[67]% uname -a Linux lcas100 2.6.9-11.ELsmp #1 SMP Fri May 20 18:26:27 EDT 2005 i686 i686 i386 GNU/Linux lcas100[68]% cat /etc/*-release LSB_VERSION="1.3" Red Hat Enterprise Linux AS release 4 (Nahant) lcas100[75]% /ots/apache/bin/httpd -v Server version: Apache/1.3.31 (Unix) Server built: Nov 3 2004 18:47:31 This doesn't make sense to me because apparently Apache 1.3.x supports PHP: http://php.net/manual/en/install.unix.apache.php Furthermore, we have another machine that runs PHP and is running the exact same OS and OS version. The reason I want it on the former machine is because it is mounted on a different file system. Lastly they tell me that all software the Apache webserver runs will need to be reinstalled/recompiled (assuming an Apache upgrade WAS needed). I am not even sure about this. Are they full of it? Thanks

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• 613 threads limit on debian

  - by Joel

  When running this program thread-limit.c on my dedicated debian server, the output says that my system can't create more than around 600 threads. I need to create more threads, and fix my system misconfiguration. Here are a few informations about my dedicated server: de801:/# uname -a Linux de801.ispfr.net 2.6.18-028stab085.5 #1 SMP Thu Apr 14 15:06:33 MSD 2011 x86_64 GNU/Linux de801:/# java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) de801:/# ldd $(which java) linux-vdso.so.1 => (0x00007fffbc3fd000) libpthread.so.0 => /lib/libpthread.so.0 (0x00002af013225000) libjli.so => /usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/../lib/amd64/jli/libjli.so (0x00002af013441000) libdl.so.2 => /lib/libdl.so.2 (0x00002af01354b000) libc.so.6 => /lib/libc.so.6 (0x00002af013750000) /lib64/ld-linux-x86-64.so.2 (0x00002af013008000) de801:/# cat /proc/sys/kernel/threads-max 1589248 de801:/# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 794624 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 10240 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 128 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Here is the output of the C program de801:/test# ./thread-limit Creating threads ... Address of c = 1061520 KB Address of c = 1081300 KB Address of c = 1080904 KB Address of c = 1081168 KB Address of c = 1080508 KB Address of c = 1080640 KB Address of c = 1081432 KB Address of c = 1081036 KB Address of c = 1080772 KB 100 threads so far ... 200 threads so far ... 300 threads so far ... 400 threads so far ... 500 threads so far ... 600 threads so far ... Failed with return code 12 creating thread 637. Any ideas how to fix this please ?

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• Drupal install and permissions

  - by Richard

  So I'm really stuck on this issue. An install process is complaining about write permission on settings.php and sites/default/files/. However, I've moved these files temporarily to write/read (chmod 777) and changed the owner/group to "apache" as shown below. -bash-4.1$ ls -hal total 28K drwxrwxrwx. 3 richard richard 4.0K Aug 23 15:03 . drwxr-xr-x. 4 richard richard 4.0K Aug 18 14:20 .. -rwxrwxrwx. 1 apache apache 9.3K Mar 23 16:34 default.settings.php drwxrwxrwx. 2 apache apache 4.0K Aug 23 15:03 files -rwxrwxrwx. 1 apache apache 0 Aug 23 15:03 settings.php However, the install is still complaining about write permissions. I followed steps one and two of the INSTALL.txt but no luck. Update: To further explore the situation, I created sites/default/richard.php with the following code: <?php error_reporting(E_ALL); ini_set('display_errors', '1'); mkdir('files'); print("<hr> User is "); passthru("whoami"); passthru("pwd"); ?> Run from the command line (under user "richard"), no problem. The folder is created everything is a go. Run from the web, I get the following: Warning: mkdir(): Permission denied in /var/www/html/sites/default/richard.php on line 9 User is apache /var/www/html/sites/default Update 2: Safe mode appears to be off... -bash-4.1$ cat /etc/php.ini | grep safe | grep mode | grep -v \; safe_mode = Off safe_mode_gid = Off safe_mode_include_dir = safe_mode_exec_dir = safe_mode_allowed_env_vars = PHP_ safe_mode_protected_env_vars = LD_LIBRARY_PATH sql.safe_mode = Off

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• start-stop-daemon can't find executable that's right in front of it

  - by Bart van Heukelom

  root@mountain-lion:/opt/smartfox# ls -lha total 180K drwxr-xr-x 8 root root 4.0K 2012-06-01 14:09 . drwxr-xr-x 4 root root 4.0K 2012-06-01 09:41 .. drwxr-xr-x 8 root root 4.0K 2009-05-17 21:57 lib lrwxrwxrwx 1 root root 22 2012-06-01 09:41 logs -> /var/opt/smartfox/logs -rwxr-xr-x 1 root root 1.4K 2012-06-01 14:28 run.sh root@mountain-lion:/opt/smartfox# cat run.sh #!/bin/bash java -cp "./:./sfsExtensions/:lib/activation.jar:lib/commons-beanutils.jar:lib/commons-collections-3.2.jar:lib/commons-dbcp-1.2.1.jar:lib/commons-lang-2.3.jar:lib/commons-logging-1.1.jar:lib/commons-pool-1.2.jar:lib/concurrent.jar:lib/ezmorph-1.0.3.jar:lib/h2.jar:lib/js.jar:lib/json-lib-2.1-jdk15.jar:lib/json.jar:lib/jsr173_1.0_api.jar:lib/jysfs.jar:lib/jython.jar:lib/nanoxml-2.2.1.jar:lib/wrapper.jar:lib/xbean.jar:lib/javamail/imap.jar:lib/javamail/mailapi.jar:lib/javamail/pop3.jar:lib/javamail/smtp.jar:lib/jetty/jetty.jar:lib/jetty/jetty-util.jar:lib/jetty/jstl.jar:lib/jetty/multipartrequest.jar:lib/jetty/servlet-api.jar:lib/jetty/standard.jar:lib/jsp-2.1/commons-el-1.0.jar:lib/jsp-2.1/core-3.1.0.jar:lib/jsp-2.1/jsp-2.1.jar:lib/jsp-2.1/jsp-api-2.1.jar:lib/jsp-2.1/jstl.jar:lib/jsp-2.1/standard.jar:lib/lsc.jar:lib/commons-io-1.4.jar" \ it.gotoandplay.smartfoxserver.SmartFoxServer > logs/smartfox.out 2>&1 & JAVAPID=$! echo "Started Smartfox. JVM PID = $JAVAPID" trap "echo Stopping Smartfox.; kill $JAVAPID" INT TERM wait echo "Smartfox stopped." root@mountain-lion:/opt/smartfox# start-stop-daemon --start --make-pidfile --pidfile /var/opt/smartfox/smartfox.pid --exec ./run.sh start-stop-daemon: unable to start ./run.sh (No such file or directory) Why can't start-stop-daemon find the script?

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• Ubuntu raid 1 write errors

  - by Micah

  I have an Ubuntu server set up with two SATA drives in a RAID 1 configuration with MDADM. The machine is used to record raw video, which involves a lot of writing to the disk. Sometimes during video recording the computer will crash, will the following errors in kern.log: Mar 15 10:39:41 video kernel: [414501.629864] ata2.00: exception Emask 0x10 SAct 0x0 SErr 0x400100 action 0x6 Mar 15 10:39:41 video kernel: [414501.629870] ata2.00: BMDMA stat 0x26 Mar 15 10:39:41 video kernel: [414501.629875] ata2.00: SError: { UnrecovData Handshk } Mar 15 10:39:41 video kernel: [414501.629880] ata2.00: failed command: WRITE DMA EXT Mar 15 10:39:41 video kernel: [414501.629889] ata2.00: cmd 35/00:00:28:6d:f6/00:04:06:00:00/e0 tag 0 dma 524288 out Mar 15 10:39:41 video kernel: [414501.629891] res 51/84:b1:77:6e:f6/84:02:06:00:00/e0 Emask 0x30 (host bus error) Mar 15 10:39:41 video kernel: [414501.629896] ata2.00: status: { DRDY ERR } Mar 15 10:39:41 video kernel: [414501.629899] ata2.00: error: { ICRC ABRT } Mar 15 10:39:41 video kernel: [414501.629910] ata2.00: hard resetting link Mar 15 10:39:41 video kernel: [414501.973009] ata2.01: hard resetting link Mar 15 10:39:41 video kernel: [414502.482642] ata2.00: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Mar 15 10:39:41 video kernel: [414502.482658] ata2.01: SATA link down (SStatus 0 SControl 300) Mar 15 10:39:41 video kernel: [414502.546160] ata2.00: configured for UDMA/133 Mar 15 10:39:41 video kernel: [414502.546203] ata2: EH complete Is this the result of faulty drives? Is software RAID just not performant enough for data rates ~15 MB/s, even with a quad-core i7? Thanks for your help. Edit: cat /proc/mdstat returns this: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdb1[1] sda1[0] 976760768 blocks [2/2] [UU] unused devices: <none>

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• where is memory gone (no, not buffers or cache)

  - by Marki

  can anyone tell me where the memory is gone: (no, this time neither buffers nor cache) # free total used free shared buffers cached Mem: 3928200 3868560 59640 0 2888 92924 -/+ buffers/cache: 3772748 155452 Swap: 4192956 226352 3966604 top, sorted by memory, descending: top - 13:42:06 up 1 day, 3:47, 2 users, load average: 0.08, 0.12, 0.36 Tasks: 228 total, 1 running, 227 sleeping, 0 stopped, 0 zombie Cpu0 : 2.0%us, 4.0%sy, 0.0%ni, 90.1%id, 0.0%wa, 0.0%hi, 4.0%si, 0.0%st Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id,100.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3928200k total, 3868020k used, 60180k free, 2896k buffers Swap: 4192956k total, 226048k used, 3966908k free, 82068k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3863 root 20 0 902m 199m 3296 S 7 5.2 99:08.77 ndsd 21906 root 20 0 138m 9076 2988 S 0 0.2 0:00.02 sfcbd 2332 root 20 0 126m 4660 1332 S 0 0.1 0:17.72 mono 4243 wwwrun 20 0 683m 4468 668 S 0 0.1 0:07.38 java 2994 root 20 0 202m 2288 1660 S 0 0.1 6:10.02 httpstkd 4338 root 20 0 184m 2240 1112 S 0 0.1 0:00.52 namcd 21898 root 20 0 32368 1832 1256 R 1 0.0 0:00.08 top In fact, some time ago oom kicked in and crashed the system (kernel panic), and I'm afraid we're again not far from that point.... UPDATE # cat /proc/meminfo MemTotal: 3928200 kB MemFree: 51336 kB Buffers: 2964 kB Cached: 72876 kB SwapCached: 29128 kB Active: 233440 kB Inactive: 88040 kB Active(anon): 188920 kB Inactive(anon): 56752 kB Active(file): 44520 kB Inactive(file): 31288 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 4192956 kB SwapFree: 3966824 kB Dirty: 32 kB Writeback: 0 kB AnonPages: 225112 kB Mapped: 11356 kB Shmem: 32 kB Slab: 1624080 kB SReclaimable: 13740 kB SUnreclaim: 1610340 kB KernelStack: 4176 kB PageTables: 10500 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 6157056 kB Committed_AS: 2397684 kB VmallocTotal: 34359738367 kB VmallocUsed: 441372 kB VmallocChunk: 34359246755 kB HardwareCorrupted: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 10240 kB DirectMap2M: 4184064 kB slabtop Active / Total Objects (% used) : 9041019 / 9207548 (98.2%) Active / Total Slabs (% used) : 401132 / 401156 (100.0%) Active / Total Caches (% used) : 91 / 159 (57.2%) Active / Total Size (% used) : 1491537.88K / 1519791.56K (98.1%) Minimum / Average / Maximum Object : 0.02K / 0.17K / 4096.00K OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 4240470 4240319 99% 0.12K 141349 30 565396K pid 2245140 2219675 98% 0.25K 149676 15 598704K size-256 2238090 2210087 98% 0.12K 74603 30 298412K size-128 ...

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• MySQL permission errors

  - by dotancohen

  It seems that on a Ubuntu 14.04 machine the user mysql cannot access anything. It is not writing logs nor reading files. Witness: - bruno():mysql$ cat /etc/passwd | grep mysql mysql:x:116:127:MySQL Server,,,:/nonexistent:/bin/false - bruno():mysql$ sudo mysql_install_db Installing MySQL system tables... 140818 18:16:50 [ERROR] Can't read from messagefile '/usr/share/mysql/english/errmsg.sys' 140818 18:16:50 [ERROR] Aborting 140818 18:16:50 [Note] Installation of system tables failed! Examine the logs in /var/lib/mysql for more information. ...boilerplate trimmed... - bruno():mysql$ ls -la /usr/share/mysql/english/errmsg.sys -rw-r--r-- 1 root root 59535 Jul 29 13:40 /usr/share/mysql/english/errmsg.sys - bruno():mysql$ wc -l /usr/share/mysql/english/errmsg.sys 16 /usr/share/mysql/english/errmsg.sys Here we have seen that mysql cannot read /usr/share/mysql/english/errmsg.sys even though the permissions are open to read it, and in fact the regular login user can read the file (with wc). Additionally, MySQL is not writing any logs: - bruno():mysql$ ls -la /var/log/mysql total 8 drwxr-s--- 2 mysql adm 4096 Aug 18 16:10 . drwxrwxr-x 18 root syslog 4096 Aug 18 16:10 .. What might cause this user to not be able to access anything? What can I do about it?

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• How do I troubleshoot a segfault in Ubuntu that occurs when typing a bogus command?

  - by Alan

  We've got a production server running Ubuntu 11.10. We're encountering segfaults that appear under various conditions. The simplest reproducible case is when we login to an ssh session as our administrative user and enter a bogus command. You'd expect the standard "command not found" error message. Instead, we get a segfault in python. The user's default shell is /bin/bash. For example: $ asdf Segmentation fault Info from /var/log/syslog: Jul 6 15:39:20 PROD001 kernel: [2155960.605695] python[7873]: segfault at 0 ip (null) sp 00007fffd030b808 error 14 in python2.7[400000+233000] Some details about the server: $ uname -a Linux PROD001 3.0.0-16-server #29-Ubuntu SMP Tue Feb 14 13:08:12 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/issue Ubuntu 11.10 \n \l Before we ask the IT department to reinstall the O.S., I'd like to understand what got us here. The system and/or this particular user's environment is suspect. Many people have touched this server over the past year, so I'm wondering if it is missing libraries, incorrectly installed packages, etc. I'm hoping that if we can understand what's going wrong in this case, it will help explain why we're getting segfaults in a couple of other scenarios. Any tips on troubleshooting this segfault will be appreciated!

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• Networking Home Office

  - by Matt

  I'm in the process of building an office in my garden. It's about 25m away from my house. I'd like to run a wired network connection to the office. I'd rather not go down the powerline route, as speeds don't seem great, and I'm likely to want to be moving a lot of data around on the internal network. I have an electrician who is running armoured electrical cable to the office, and is providing conduit for me to run network cable. My questions are: 1) What type of cable to run 2) How I terminate/connect it at both ends I could get something like armoured cat6 utp solid core (like this: http://www.netstoredirect.com/cat6-cable/289166-external-armoured-cat6-utp-solid-cable-price-per-metre.html) which seems fairly robust, but then I have to terminate it. Additionally, where the cable enters my house, there is about another 15m to where my router is situated. I also read this artice: http://www.audioholics.com/audio-video-cables/bjc-cat-network-cable-quality-interview which scared me into realising I don't know what I'm doing!! particularly with termination. Or I could get an "cat6 external patch cable" (e.g http://www.netstoredirect.com/rj45-network-cables/239231-external-cat6-utp-ldpe-rj45-patch-leads.html) and run that in the conduit, and work out how to terminate it at the house end. At the office end I guess I can just plug it into a switch. Any help? Thanks

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• Hostname error on my Slicehost Ubuntu server

  - by allesklar

  Like many folks who upgraded to Rails 2.2, I got an exception raised when sending an email. This version of Rails or later does require using tls for sending emails. The message in the production log file says: hostname was not match with the server certificate I did a whole lot of research and work on this and did everything I could. I changed my slice's hostname to ohlalaweb.com. If I run the command 'hostname' at the CL I get: ohlalaweb.com Postfix seems to work fine. I can send emails from the CL to my gmail, yahoo, and google apps gmail accounts with no problems. Here is the result of cat /etc/postfix/main.cf # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. myorigin = /etc/mailname smmtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ohlalaweb.pem smtpd_tls_key_file=/etc/ssl/certs/ohlalaweb.pem smtpd_use_tls=yes # SA created next line to force postfix to use self create certificate smtpd_tls_auth_only=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = ohlalaweb.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = localhost.localdomain, localhost relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all I have regenerated the ssl keys with the ohlalaweb.com host name. Any ideas or suggestions?

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• How to set up IP forwarding on Nexenta (Solaris)?

  - by Gleb

  I am trying to set up IP forwarding on my Nexenta box: root@hdd:~# uname -a SunOS hdd 5.11 NexentaOS_134f i86pc i386 i86pc Solaris The box has 2 network interfaces: root@hdd:~# ifconfig -a lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 inet 127.0.0.1 netmask ff000000 e1000g1: flags=1001100843<UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4,FIXEDMTU> mtu 1500 index 2 inet 192.168.12.2 netmask ffffff00 broadcast 192.168.12.255 ether 68:5:ca:9:51:b8 myri10ge0: flags=1100843<UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4> mtu 9000 index 3 inet 10.10.10.10 netmask ffffff00 broadcast 10.10.10.255 ether 0:60:dd:47:87:2 lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1 inet6 ::1/128 192.168.12.0 is my normal LAN with 192.168.12.1 being the firewall/gateway 10.10.10.0 is a separate LAN for iSCSI (with no internet access) I want to set up IP forwarding so that a computer on 10.10.10.0 will be able to access the internet by using 10.10.10.10 as a gateway (I don't need any port forwarding) I have turned on IP forwarding: root@hdd:~# routeadm Configuration Current Current Option Configuration System State --------------------------------------------------------------- IPv4 routing disabled disabled IPv6 routing disabled disabled IPv4 forwarding enabled enabled IPv6 forwarding disabled disabled Routing services "route:default ripng:default" Routing daemons: STATE FMRI disabled svc:/network/routing/rdisc:default disabled svc:/network/routing/route:default disabled svc:/network/routing/legacy-routing:ipv4 disabled svc:/network/routing/legacy-routing:ipv6 disabled svc:/network/routing/ripng:default online svc:/network/routing/ndp:default But when I dry to start ipnat, I get an error: root@hdd:~# ipnat -CF -f /etc/ipf/ipnat.conf ioctl(SIOCGNATS): I/O error Here is the config: root@hdd:~# cat /etc/ipf/ipnat.conf #!/sbin/ipnat -f - # map e1000g1 10.10.10.10/24 -> 192.168.12.2/32 So the question is how to fix this.. Thanks in advance!

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• Long Gigabit Ethernet Run

  - by Timothy R. Butler

  I am trying to get an Gig-E network between two buildings that are approximately 260 ft. away. While some TRENDnet switches failed to be able to connect to each other over Cat 6 at that distance, two Netgear 5-port Gig-E switches do so just fine. However, it still fails after I put in place APC PNET1GB ethernet surge protectors at each end before the line connects to the respective switches. So I find myself wondering if I simply need to find a better surge protector that doesn't degrade the signal as much (if so, what kind would you recommend?) or if I should give up on copper and use fiber between the buildings. If I opt to go the latter route, I could really use some pointers. It looks like LC connectors are the most common, but I keep running into some others as well. A media converter on each end seems like the simplest solution, but perhaps a Gig-E switch with an SFP port would make more sense? Given a very limited budget, sticking with my existing copper seems best, but if it is bound to be a headache, a 100 meter fiber cable is something I think I can swing cost wise.

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• Is there any way to detect when nginx has completed a graceful shutdown?

  - by Daniel Vandersluis

  I have a ruby on rails application which is running on passenger and nginx, with one main webserver and multiple application servers. I am trying to update my deployment process in order to minimize (or ideally, remove) any downtime caused by the deployment. The main roadblock right now is that passenger takes some time to restart (ie. reload the application), so in order to get around this, I want to stagger my restarts so that only one app server gets restart at a time. In order to do this without losing any long running passenger processes, I am thinking I need to gracefully shutdown the app server's nginx instance, which will cause it to no longer accept new connections but continue to process the existing ones; as well, HAProxy will detect that the app server is down and route new requests to the other server. However, assuming that there is a long-running process, I am not sure how to detect when the graceful shutdown has completed so that I can start it back up. Since the shutdown is caused by sending a signal (ie. kill -QUIT $( cat /var/run/nginx.pid )), and the kill command will return immediately, I cannot combine commands (ie. kill ... && touch restarted), as the touch command will execute immediately, even if nginx hasn't completed its shutdown. Is there any good way to do this?

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• nf_conntrack complaints in dmesg

  - by Alexander Gladysh

  While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server: [11458852.811070] net_ratelimit: 321 callbacks suppressed [11458852.811075] nf_conntrack: table full, dropping packet. [11458852.819957] nf_conntrack: table full, dropping packet. [11458852.821083] nf_conntrack: table full, dropping packet. [11458852.822195] nf_conntrack: table full, dropping packet. [11458852.824987] nf_conntrack: table full, dropping packet. [11458852.825298] nf_conntrack: table full, dropping packet. [11458852.825891] nf_conntrack: table full, dropping packet. [11458852.826225] nf_conntrack: table full, dropping packet. [11458852.826234] nf_conntrack: table full, dropping packet. [11458852.826814] nf_conntrack: table full, dropping packet. Complains are repeated every five seconds (number of suppressed callbacks is different each time). What can these sympthoms mean? Is that bad? Any hints? (Note that the question is more narrow than "how to solve specific case of bad HTTP server performance", so I do not give more details on that.) Additional info: $ uname -a Linux MYHOST 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise $ cat /proc/sys/net/netfilter/nf_conntrack_max 1548576 The server is under about 10M hits / day load.

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• Why does cpuinfo report that my frequency is slower?

  - by Avery Chan

  My machine is running off of a AMD Sempron(tm) X2 190 Processor. According the marketing copy, it should be running at around 2.5 Ghz. Why is the cpu speed being reported as something lower? Spec description (in Chinese) $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 6 model name : AMD Sempron(tm) X2 190 Processor stepping : 3 microcode : 0x10000c8 cpu MHz : 800.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save bogomips : 5022.89 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate processor : 1 vendor_id : AuthenticAMD cpu family : 16 model : 6 model name : AMD Sempron(tm) X2 190 Processor stepping : 3 microcode : 0x10000c8 cpu MHz : 800.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save bogomips : 5022.82 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate

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• Segmentation fault on login to mysql

  - by numberwhun

  Hello everyone! I recently did a fresh install of Ubuntu on my laptop (HP dv7, AMD Dual Core with 4 gigs RAM). I am working on installing my development environment and tools and one of the first things I was working on is getting MySQL installed. The following was my configure statement with options: ./configure --prefix=/usr/local/mysql --with-big-tables --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock --with-named-curses-libs=/lib/libncurses.so.5.7 After I did the make;make install, I did the post configuration such as setting the root password and installing the mysqld daemon in its rightful place. My issue is when I try to log in to mysql to start using it, the following shows what happens: $ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.1.42 Source distribution Segmentation fault I have searched Google extensively, I have searched through the mysql bugs database and I have yet to find anything that matches my issue. Here is the contents of my my.cnf file, in case you want to see it: $ cat /etc/my.cnf [mysqld] basedir=/usr/local/mysql datadir=/usr/local/mysql socket=/usr/local/mysql/tmp/mysql.sock [mysql.server] user=mysql #basedir=/var/lib [client] socket=/usr/local/mysql/tmp/mysql.sock [mysqld_safe] err-log=/usr/local/mysql/logs/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I am really hoping that someone here can tell me what has gone wrong with my installation as I would really love to know. I welcome and look forward to all responses. Thank you in advance! Best regards, Jeff

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• Failed to mount to nfs server with "Program not Registered"

  - by Farrel

  I'm trying to setup nfs server on Fedora 17 and I'm getting "Program not Registered" error when I'm trying to mount. I guess the main reason for this is rpcbind. I'm a newbie in linux, so I don't know what info should I provide you with. Here is some info that might be useful. rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper 100005 1 udp 20048 mountd 100005 1 tcp 20048 mountd 100005 2 udp 20048 mountd 100005 2 tcp 20048 mountd 100005 3 udp 20048 mountd 100005 3 tcp 20048 mountd 100024 1 udp 42223 status 100024 1 tcp 50054 status cat /etc/exports /home/Farrel/prog 192.168.xxx.xxx (ro,sync) service nfs status Redirecting to /bin/systemctl status nfs.service nfs-server.service - NFS Server Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; enabled) Active: active (exited) since Fri, 02 Nov 2012 09:29:04 +0300; 5min ago Process: 924 ExecStartPost=/usr/lib/nfs-utils/scripts/nfs-server.postconfig (code=exited, status=0/SUCCESS) Process: 909 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS ${RPCNFSDCOUNT} (code=exited, status=0/SUCCESS) Process: 885 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS) Process: 864 ExecStartPre=/usr/lib/nfs-utils/scripts/nfs-server.preconfig (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/nfs-server.service Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable. Firewall is disabled on both systems. I spent a lot of time reading on the topic but all manuals on setting up nfs server lead to "Program not Registered" error. Any how-to-fix-it ideas?

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• 1GB cached memory - Do I need more RAM?

  - by Martin

  The server runs well but I wonder if I should get more RAM. I only have a few MB of "free" memory and 1.2GB of "cached" memory: free: total used free shared buffers cached Mem: 3945 3893 51 0 28 1216 -/+ buffers/cache: 2648 1296 Swap: 3895 857 3038 I learned that cached memory is used while it's free and not. Is the cached value an indicator for the need of more RAM? cat /proc/meminfo 1 day after flushing the cache: MemTotal: 4040048 kB MemFree: 32844 kB Buffers: 18956 kB Cached: 1249092 kB SwapCached: 161576 kB Active: 3611328 kB Inactive: 189104 kB SwapTotal: 3989496 kB SwapFree: 2894200 kB Dirty: 20520 kB Writeback: 0 kB AnonPages: 2523496 kB Mapped: 217744 kB Slab: 70940 kB SReclaimable: 36756 kB SUnreclaim: 34184 kB PageTables: 99648 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 6009520 kB Committed_AS: 6401716 kB VmallocTotal: 34359738367 kB VmallocUsed: 18852 kB VmallocChunk: 34359719439 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB top: top - 17:20:10 up 112 days, 3:06, 1 user, load average: 1.01, 1.62, 1.48 Tasks: 208 total, 1 running, 207 sleeping, 0 stopped, 0 zombie Cpu(s): 0.6%us, 0.6%sy, 0.0%ni, 97.5%id, 1.3%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 4040048k total, 3953108k used, 86940k free, 16348k buffers Swap: 3989496k total, 1095712k used, 2893784k free, 1235436k cached

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• Postfix rewrite sender: why doesn't this work

  - by Nick Coleman

  I have server A with an IP address only and a dummy FQDN (on the basis all machines should have a FQDN): pants.net.invalid. All mail is relayed through another server elsewhere, which works fine. On server A, Postfix rewrites the sender address with smtp_generic_maps = hash:/etc/postfix/generic. According to the Rewrite manual at http://www.postfix.org/ADDRESS_REWRITING_README.html#remote, this should rewrite all outgoing external mail's Sender address: $ cat /etc/postfix/generic @pants.net.invalid [email protected] but it does not. postmap -q [email protected] returns nothing. This works: [email protected] [email protected] It seems as though it is doing regex matching even though I specify type hash:. Clearly I am misunderstanding the manual. I don't want to use regex or pcre expressions because there are only a couple of users (root and two others) and I don't want the overhead. I can specify the users exactly and it works. But, I would like to know what I am misunderstanding for future reference. Thanks.

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• Do you need to advertise an AFP service via Avahi for an Ubuntu Server to show up in OSX Finder?

  - by James

  I am only advertising an NFS share plus the "model", and I don't want to install extra services on the Server unless I have to, ie netatalk, as it is used solely for NFS exports. Currently there is no entry in Finder under "Shared" with below config of Avahi. serveradmin@FILESERVER:/etc/avahi/services$ cat nfs.service <?xml version="1.0" standalone='no'?><!--*-nxml-*--> <!DOCTYPE service-group SYSTEM "avahi-service.dtd"> <service-group> <name replace-wildcards="yes">%h</name> <service> <type>_nfs._tcp</type> <port>2049</port> <txt-record>path=/Volumes/StoragePool</txt-record> </service> <service> <type>_device-info._tcp</type> <port>0</port> <txt-record>model=Xserve</txt-record> </service> </service-group> Server: Ubuntu 12.04.01 x64 Clients: OSX 10.6.8 , 10.7.5, 10.8.2 The goal is to advertise that NFS share, then assign a really old Model code of Mac like a Powermac and switch out the icon for a more "LinuxServer-y" one. Plus allow users to connect to NFS in a manner they are familiar with like our other Xserve servers. I think Avahi is working in general as if I do: nfs://FILESERVER.local/Volumes/StoragePool it will connect fine. Any ideas?

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• Setting up vncserver on OpenSolaris zone

  - by k.park

  I am running OpenSolaris 5.10 and set up a sparse zone(inherits most of bin directories from global zone). I ended up copying many etc and var files from global zone, eventually most of the stuff(firefox,gvim, etc.) working through ssh via X11. However, I am having problems setting up vncserver on the zone. This is what I get if I tried to start the vncserver. vncext: VNC extension running! vncext: Listening for VNC connections on port 5911 vncext: created VNC server for screen 0 Fatal server error: could not open default font 'fixed' _X11TransNAMEDOpenClient: Cannot open /tmp/.X11-pipe/X11 for NAMED connection _X11TransOpen: transport open failed for local/%zone%:11 xsetroot: unable to open display '%zone%:11' _X11TransNAMEDOpenClient: Cannot open /tmp/.X11-pipe/X11 for NAMED connection _X11TransOpen: transport open failed for local/%zone%:11 _X11TransNAMEDOpenClient: Cannot open /tmp/.X11-pipe/X11 for NAMED connection _X11TransOpen: transport open failed for local/%zone%:11 _X11TransNAMEDOpenClient: Cannot open /tmp/.X11-pipe/X11 for NAMED connection _X11TransOpen: transport open failed for local/%zone%:11 vncconfig: unable to open display "%zone%:11" twm: unable to open display "%zone%:11" xterm Xt error: Can't open display: %zone%:11 I already chmoded /tmp/.X11-pipe with 777, and there is no pipe in /tmp/.X11-pipe or /tmp/.X11-unix directory. Here is my cat /etc/release: OpenSolaris 2009.06 snv_111b X86 Copyright 2009 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms. Assembled 07 May 2009 BRAND: ipkg

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• How can find the USB wireless adapter into the dmesg log file?

  - by AndreaNobili

  I am pretty new in Linux (RaspBian for RaspBerry Pi but I think that there are not difference) and I have to install an USB wireless network adapter (the product is the TP-Link TL-WN725N, this one: http://www.tp-link.it/products/details/?model=TL-WN725N ) Now, I think that this is not automatically recognized by my system because if I execute ifconfig command I obtain the following output: pi@raspberrypi ~ $ ifconfig eth0 Link encap:Ethernet HWaddr b8:27:eb:2a:9f:b0 inet addr:192.168.1.8 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:475 errors:0 dropped:0 overruns:0 frame:0 TX packets:424 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:34195 (33.3 KiB) TX bytes:89578 (87.4 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) So now it see only my ethernet network interface and not the wireless. So I was thinkig to try to see into the dmesg, but I don't know what have I to see and how to select it into the dmesg output. For example by the following command I can see the line of the dmesg log file relate to my ethernet port: pi@raspberrypi ~ $ cat /var/log/dmesg |grep -i eth [ 3.177620] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:2a:9f:b0 [ 18.030389] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup [ 19.642167] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x45E1 But what can I try to search for the USB wireless adapter? Tnx

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• /etc/crontab or any user crontab is not being executed

  - by ian

  My server is CentOS 5. When I edit /etc/crontab or edit any user(including root) crontab via "crontab -e" command, it just adds "(system) RELOAD (/etc/crontab)" or "(admin) RELOAD (cron/admin)" in the log. No CMD in the /var/log/cron. Sample entry in /var/log/cron: Aug 10 10:21:33 localhost crontab[31688]: (root) BEGIN EDIT (root) Aug 10 10:21:42 localhost crontab[31688]: (root) REPLACE (root) Aug 10 10:21:42 localhost crontab[31688]: (root) END EDIT (root) Aug 10 10:22:01 localhost crond[2688]: (root) RELOAD (cron/root) Result of "service crond status": crond (pid 1345) is running... The command "cat /var/log/messages | grep cron" does not give anything. Contents of /etc/cron.allow: admin root Contents of /etc/crontab: SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ # run-parts 01 * * * * root run-parts /etc/cron.hourly 02 4 * * * root run-parts /etc/cron.daily 22 4 * * 0 root run-parts /etc/cron.weekly 42 4 1 * * root run-parts /etc/cron.monthly * * * * * root run-parts /bin/date >> /data/date.txt Result of ps aux |grep cron: root 1345 0.0 0.1 5268 1204 ? Ss 11:43 0:00 crond Contents of admin's crontab: * * * * * /bin/date >> /data/date.txt Note that it's not only admin's crontab that's not running. All cron jobs are not running. Any ideas why they aren't running?

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