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• Switch HTTP Virtual Host to HTTPS Virtual Host

  - by Kumar

  We are using apache web server with RHEL 6.4. Currently we configured Name based virtual host on server. Enabled "Namebased Virtualhost *:80" and created /etc/httpd/conf.d/example-com.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/vhost/example.com/public_html ServerName www.example.com ServerAlias example.com ErrorLog /var/log/httpd/vhosts/example-com-error_log CustomLog /var/log/httpd/vhosts/example-com-access_log common </VirtualHost> I've located my ssl certificates by /etc/httpd/conf.d/ssl.conf In this case how can I switch 80 site to 433 and also redirect all requests to 80 to 443

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• Mindtouch with fcgid - Fast CGI apache worker thread.

  - by Stephan Kristyn

  Anyone got Dekiwiki / Mindtouch running with fcgid-module? I get 504 and 500 all the time. mod_fcgid: can't apply process slot for /var/www/html/dekiwiki/index.php [Tue Dec 28 06:14:03 2010] [warn] (104)Connection reset by peer: mod_fcgid: read data from fastcgi server error. [Tue Dec 28 06:14:03 2010] [error] [client 92.75.107.53] Premature end of script headers: index.php I'm currently fiddling with SuExec and fast-cgi wrapper directory permissions, because I also employ a chrooted SFTP jail. Sometimes the first line about the process slot does not appear now. I found a solution in german and will work it through now. http://debianforum.de/forum/viewtopic.php?f=8&t=122758&start=15

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• Zabbix Proxy not collecting data

  - by syntaxcollector

  Hi All I have a working Zabbix 1.8.2 server collecting data for our office and our colo facility. However the link between the colo and office is flaky. What I'm trying to do is setup a proxy on the colo side to have a 1 hour cache and relay the data to our primary server at the office. Our zabbix server is compiled from source and uses a mysql database I've followed the instructions found in the zabbix documentation to compile the proxy using a sqlite3 database. I add the proxy to zabbix under Administration-DM-Proxies. The zabbix server "sees" the proxy because the "last seen" field is always under 60s. However when I assign a colo host to the proxy I stop receiving data from it. The colo host's zabbix_agentd.log file says this: 29343:20100622:124847 Timeout while answering request 29343:20100622:124847 Getting list of active checks failed. Will retry after 60 seconds The zabbix_proxy.log says this. 2041:20100622:123131.760 Deleted 0 records from history [0.000994 seconds] 2028:20100622:124131.671 Error while receiving answer from server [ZBX_TCP_READ() failed I also am unable to receive any SNMP data which is more important to me than the zabbix agent data. Has anyone had this problem before? Zabbix Server OS: CentOS5.4 Zabbix Server Build: 1.8.2 from source Zabbix Proxy OS: CentOS5.4 Zabbix Proxy Build: 1.8.2 from source P.S. The SQLite database on the zabbix proxy never gets any data written to it, it is identical to when I created it from the blank schema in zabbix-1.8.2/create/schema. (Yes I've checked the permissions)

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• Difference between Admin and Manager role in Tomcat6

  - by Nyxynyx

  What are the roles admin and manager used for in Tomcat6? The manager role appears to give me access to http://domain.com:8080/manager/html. Which page does the admin role give me? In the file, the description for admin role is pretty vague. What is the host manager webapp? <!-- The host manager webapp is restricted to users with role "admin" --> <!--<user name="tomcat" password="password" roles="admin" />--> <!-- The manager webapp is restricted to users with role "manager" --> <!--<user name="tomcat" password="password" roles="manager" />-->

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• KVM network bridge with two NICs

  - by Eil

  Greetings, I'm trying to set up bridged networking with KVM and am getting nowhere. There are docs and tutorials on the subject, but they all seem to conflict or don't provide enough info. I was wondering if someone can give me a high-level overview of how to get this working. I can probably work out the details myself (configuring the interfaces, adding routes, etc), I just need help on the big picture: how everything is interconnected. I have a RHEL5 server with KVM installed and running. It has two physical NICs, eth0 and eth1 in the same VLAN. I would like to use eth1 for all traffic between the guests and the rest of the network and reserve eth0 for host management, guest migrations, etc if possible. I'm not picky about which one gets the default route, although it would be nice if we could make it eth0. All of the guests will have static IPs. I would prefer that when a new guest is added, the networking configuration only needs to be set from within the guest itself. Basically, I want this: eth0: all host traffic eth1: all guest traffic Open to any other suggestions if this isn't possible or will be kludgy/difficult. Pointers to existing documentation might not be helpful since I've already been though just about everything out there. Thanks for any help.

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• Creating yum repo

  - by luckytaxi

  I followed this link on how to create my own yum repository for base install and update purposes. If you notice, why would I need a 5 folder on top of 5.4? My installation at the moment is all 5.4, so when I ran "yum update" it wanted to go to http://domain.com/5/... instead of picking up the 5.4 directory. Is 5 basically 5.4 w/ the most updated packages for that tree? meaning, if 5.5 comes out, 5 would be the latest and greatest and if I wanted to track 5.4, I would still need a 5.4 folder to track changes with?

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• How do you re-mount an ext3 fs readwrite after it gets mounted readonly from a disk error?

  - by cagenut

  Its a relatively common problem when something goes wrong in a SAN for ext3 to detect the disk write errors and remount the filesystem read-only. Thats all well and good, only when the SAN is fixed I can't figure out how to re-re-mount the filesystem read-write without rebooting. Behold: [root@localhost ~]# multipath -ll mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=2][active] \_ 1:0:0:1 sdb 8:16 [active][ready] \_ 2:0:0:1 sdc 8:32 [active][ready] [root@localhost ~]# mount /dev/mapper/mpath0 /mnt/foo [root@localhost ~]# touch /mnt/foo/blah All good, now I yank the LUN out from under it. [root@localhost ~]# touch /mnt/foo/blah [root@localhost ~]# touch /mnt/foo/blah touch: cannot touch `/mnt/foo/blah': Read-only file system [root@localhost ~]# tail /var/log/messages Mar 18 13:17:33 localhost multipathd: sdb: tur checker reports path is down Mar 18 13:17:34 localhost multipathd: sdc: tur checker reports path is down Mar 18 13:17:35 localhost kernel: Aborting journal on device dm-2. Mar 18 13:17:35 localhost kernel: Buffer I/O error on device dm-2, logical block 1545 Mar 18 13:17:35 localhost kernel: lost page write due to I/O error on dm-2 Mar 18 13:17:36 localhost kernel: ext3_abort called. Mar 18 13:17:36 localhost kernel: EXT3-fs error (device dm-2): ext3_journal_start_sb: Detected aborted journal Mar 18 13:17:36 localhost kernel: Remounting filesystem read-only It only thinks its read-only, in reality its not even there. [root@localhost ~]# multipath -ll sdb: checker msg is "tur checker reports path is down" sdc: checker msg is "tur checker reports path is down" mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=0][hwhandler=0][rw] \_ round-robin 0 [prio=0][enabled] \_ 1:0:0:1 sdb 8:16 [failed][faulty] \_ 2:0:0:1 sdc 8:32 [failed][faulty] [root@localhost ~]# ll /mnt/foo/ ls: reading directory /mnt/foo/: Input/output error total 20 -rw-r--r-- 1 root root 0 Mar 18 13:11 bar How it still remembers that 'bar' file being there... mystery, but not important right now. Now I re-present the LUN: [root@localhost ~]# tail /var/log/messages Mar 18 13:23:58 localhost multipathd: sdb: tur checker reports path is up Mar 18 13:23:58 localhost multipathd: 8:16: reinstated Mar 18 13:23:58 localhost multipathd: mpath0: queue_if_no_path enabled Mar 18 13:23:58 localhost multipathd: mpath0: Recovered to normal mode Mar 18 13:23:58 localhost multipathd: mpath0: remaining active paths: 1 Mar 18 13:23:58 localhost multipathd: dm-2: add map (uevent) Mar 18 13:23:58 localhost multipathd: dm-2: devmap already registered Mar 18 13:23:59 localhost multipathd: sdc: tur checker reports path is up Mar 18 13:23:59 localhost multipathd: 8:32: reinstated Mar 18 13:23:59 localhost multipathd: mpath0: remaining active paths: 2 Mar 18 13:23:59 localhost multipathd: dm-2: add map (uevent) Mar 18 13:23:59 localhost multipathd: dm-2: devmap already registered [root@localhost ~]# multipath -ll mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=2][enabled] \_ 1:0:0:1 sdb 8:16 [active][ready] \_ 2:0:0:1 sdc 8:32 [active][ready] Great right? It says [rw] right there. Not so fast: [root@localhost ~]# touch /mnt/foo/blah touch: cannot touch `/mnt/foo/blah': Read-only file system OK, doesn't do it automatically, I'll just give it a little push: [root@localhost ~]# mount -o remount /mnt/foo mount: block device /dev/mapper/mpath0 is write-protected, mounting read-only Noooooooooo. I have tried all sorts of different mount/tune2fs/dmsetup commands and I cannot figure out how to get it to un-flag the block device as write-protected. Rebooting will fix it, but I'd much rather do it on-line. An hour of googling has gotten me nowhere either. Save me ServerFault.

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• Can I map several physical interfaces to a single vmware vmnet interface?

  - by EricJLN

  I am using a rack mounted device that has 10 Ethernet ports built into it. For 8 of the ports, I would like to bind them to a single vwmare-server-2.0 virtual network interface, so that I can, in effect, use the ports as a hub for the external devices and internal virtual machines. How can I bridge a single vmware vmnet# interface to several physical interfaces?

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• Can access SSH but can't access cPanel web server

  - by Tom

  I've built a Cent OS 6.0 vps and then i've installed the latest cPanel/WHM. This isn't my first installation but i've noticed something weird especially that i've never used the 6.0 version.. when i tried to install cPanel, it didn't recognize wget so installed it, then cPanel said that Perl isn't installed, i've installed that and the installation went well since then. Now, when i've tried to access the server via the browser with the IP Adress as i've used to, it didn't work, it was just loading forever, i tried the 2087 port, still the same. but SSH works. I've also tried the commands to start the server manually but none of them worked. How to fix that? Edit: iptables -nL Result root@server [~]# iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination acctboth all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT) target prot opt source destination acctboth all -- 0.0.0.0/0 0.0.0.0/0 Chain acctboth (2 references) target prot opt source destination tcp -- 216.119.149.168 0.0.0.0/0 tcp dpt:80 tcp -- 0.0.0.0/0 216.119.149.168 tcp spt:80 tcp -- 216.119.149.168 0.0.0.0/0 tcp dpt:25 tcp -- 0.0.0.0/0 216.119.149.168 tcp spt:25 tcp -- 216.119.149.168 0.0.0.0/0 tcp dpt:110 tcp -- 0.0.0.0/0 216.119.149.168 tcp spt:110 icmp -- 216.119.149.168 0.0.0.0/0 icmp -- 0.0.0.0/0 216.119.149.168 tcp -- 216.119.149.168 0.0.0.0/0 tcp -- 0.0.0.0/0 216.119.149.168 udp -- 216.119.149.168 0.0.0.0/0 udp -- 0.0.0.0/0 216.119.149.168 all -- 216.119.149.168 0.0.0.0/0 all -- 0.0.0.0/0 216.119.149.168 all -- 0.0.0.0/0 0.0.0.0/0

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• Problem with glaux.h locating

  - by Rodnower

  Hello, I try to compile code, that beggins with: #include<stdlib.h> #include<GL/gl.h> #include<glaux.h> with command: cc -o test test.c -I/usr/local/include -L/usr/local/lib -lMesaaux -lMesatk -lMesaGL -lXext -lX11 -lm But one of errors I got is: test.c:3:18: error: glaux.h: No such file or directory Then I try: yum provides glaux.h but yum find anything. Before all I installed Mesa with: yum install mesa* So, can anyone tell me from where I can get the header file? Thank you for ahead.

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• Properly Hosting Multiple Sites on VDS

  - by Aristotle

  I'm going to be moving about 7-10 websites (5-8 with Databases - MySQL) onto our new Virtual Private Server. I'm curious what the best way to host many sites on a single server is though. Do I create a directory for each site immediately within my root directory, and then point the domain names for each site to http://123.123.123.123/siteDirectory - or is there a more appropriate way to do this? I'm very interested in maintining control over how many concurent connections each site can have at any given time - would I be able to do that on the directory-level, or am I required to limit the concurrent-connections to the VPS itself?

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• Useless Plesk Error?

  - by Josh Pennington

  I am trying to determine why Plesk on my server won't start and I have no idea where to even start (since my hosting company appears to not want to help me out). Anyways, the error in my Plesk error_log is as follows: 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) It leads me to believe its a problem with the SSL on the server but I am not sure what to make of the error. Can someone lead me in the right direction? Thanks Josh Pennington

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• How to detect hard disk failure?

  - by Devator

  So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down: Personalities : [raid1] md2 : active raid1 sdb2[1] 104320 blocks [2/1] [_U] md5 : active raid1 sdb5[1] 2104448 blocks [2/1] [_U] md6 : active raid1 sdb6[1] 830134656 blocks [2/1] [_U] md1 : active raid1 sdb1[1] 143363968 blocks [2/1] [_U] and Nov 5 22:04:37 m38501 smartd[4467]: Device: /dev/sda, not capable of SMART self-check However when I do smartctl -H /dev/sda, it passes the test. It also passes the test with smartctl --test=short /dev/sda. So, is smartctl a broken testing tool, or am I doing something completely off?

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• Can't FTP into server

  - by Roland

  I need to FTP in from one server to another If I FTP using my local PC using Krusader I'm able to FTP into the server but if I ssh into one server and I'm trying to FTP to the server using the same ftp credentials I get message [Resolving host address...] I know this address is correct since I can ping it from the server I use the following command lftp 'open -u username,password server' If I use the same command to ftp to a different server it works. Any help advise will be greatly appreciated.

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• How to create RPM for 32-bit arch from a 64-bit arch server?

  - by Gnanam

  Our production server is running CentOS5 64-bit arch. Because there are no RPM available currently for SQLite latest version (v3.7.3), I created RPM using rpmbuild the very first time by following the instructions given here. I was able to successfully create RPM for 64-bit (x86_64) architecture. But am not able to create RPM for 32-bit (i386) architecture. It failed with the following errors: ... ... ... + ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --target=i386-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --enable-threadsafe checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for style of include used by make... GNU checking for x86_64-redhat-linux-gnu-gcc... no checking for gcc... gcc checking for C compiler default output file name... configure: error: C compiler cannot create executables See `config.log' for more details. error: Bad exit status from /var/tmp/rpm-tmp.73141 (%build) RPM build errors: Bad exit status from /var/tmp/rpm-tmp.73141 (%build) This is the command I called: rpmbuild --target i386 -ba sqlite.spec My question is, how do I create RPM for 32-bit arch from a 64-bit arch server?

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• scheck_sip in nagios

  - by hussein abou esber

  hi when i try to check A SIP account the command returns (SIP timeout:No response from SIP server after 15 second) remark :the same result is observed on the nagios web interface and if i try from the command line it is the same any body had a solution plz im in a such a hurry since im preparing a project to be presented in my college thanks

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• X11 performance problem after upgrading from Centos3 to Centos5 with an ATI Rage XL

  - by Marcelo Santos

  After upgrading a computer from Centos3 to Centos5 an application that does a lot of scrolling took a very high performance hit. top tells me that X is using a lot of CPU and that was not happening before. The machine has an ATI Rage XL with 8MB and X is using the ati driver as there is no proprietary ATI driver for this board on linux. The xorg.conf: Section "Device" Identifier "Videocard0" Driver "ati" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1024x768" "800x600" "640x480" EndSubSection EndSection Section "DRI" Group 0 Mode 0666 EndSection A similar machine that still has Centos3 installed is able to start DRI on the X server while this one is not, this is the Xorg.0.log for the Centos5 machine: drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed [drm] failed to load kernel module "mach64" (II) ATI(0): [drm] drmOpen failed (EE) ATI(0): [dri] DRIScreenInit Failed (II) ATI(0): Largest offscreen areas (with overlaps): (II) ATI(0): 1024 x 1279 rectangle at 0,768 (II) ATI(0): 768 x 1280 rectangle at 0,768 (II) ATI(0): Using XFree86 Acceleration Architecture (XAA) Screen to screen bit blits Solid filled rectangles 8x8 mono pattern filled rectangles Indirect CPU to Screen color expansion Solid Lines Offscreen Pixmaps Setting up tile and stipple cache: 32 128x128 slots 10 256x256 slots (==) ATI(0): Backing store disabled (==) ATI(0): Silken mouse enabled (II) ATI(0): Direct rendering disabled (==) RandR enabled I also tried using EXA instead of XAA and setting: Option "AccelMethod" "XAA" Option "XAANoOffscreenPixmaps" "true" uname -a Linux sir5.erg.inpe.br 2.6.18-128.7.1.el5 #1 SMP Mon Aug 24 08:20:55 EDT 2009 i686 i686 i386 GNU/Linux rpm -qa | grep xorg-x11-server xorg-x11-server-utils-7.1-4.fc6 xorg-x11-server-sdk-1.1.1-48.52.el5 xorg-x11-server-Xvfb-1.1.1-48.52.el5 xorg-x11-server-Xnest-1.1.1-48.52.el5 xorg-x11-server-Xorg-1.1.1-48.52.el5 The drmOpenDevice error continues when using the suggested Option "AIGLX" "true".

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• Kickstart based installation of RHEL 6.4 from USB

  - by Peter

  I want to setup some brand new servers with RHEL 6.4. Servers do not have DVD, so, I have to use USB for the installation. I already have a custom ISO with a kickstart file that I use on servers with DVD flawlessly. I used iso2usb to move the ISO t? my USB. When I boot from the USB, the ks file is found, anaconda starts, but then stops with the following error: "The installation source given by device ['sda1'] could not be found. Please check your parameters and try again" Notes: The USB IS the sda. My custom ISO file is renamed to linux.iso from iso2usb and it is present in the root directory of the USB. Kickstart file has the following entry: harddrive --partition=sda1 --dir=/ Please help me to automate the installation with kickstart. Edit 1: This the anaconda.log file: 09:01:57,029 INFO : no /etc/zfcp.conf; not configuring zfcp 09:01:57,259 INFO : created new libuser.conf at /tmp/libuser.4rAbps with instPath="/mnt/sysimage" 09:01:57,259 INFO : anaconda called with cmdline = ['/usr/bin/anaconda', '--stage2', 'hd:sda1:///images/install.img', '--dlabel', '--kickstart', '/tmp/ks.cfg', '--graphical', '--selinux', '--lang', 'en_US.UTF-8', '--keymap', 'us', '--repo', 'hd:sda1:/'] 09:01:57,260 INFO : Display mode = g 09:01:57,260 INFO : Default encoding = utf-8 09:01:59,444 DEBUG : X server has signalled a successful start. 09:01:59,446 INFO : Starting window manager, pid 1345. 09:01:59,537 INFO : Starting graphical installation. 09:01:59,741 INFO : Detected 7968M of memory 09:01:59,741 INFO : Swap attempt of 7968M 09:02:00,840 INFO : ISCSID is /usr/sbin/iscsid 09:02:00,840 INFO : no initiator set Edit 2: This is the part of anaconda log that indicates that it found the USB etc: 09:01:47,918 INFO : starting STEP_STAGE2 09:01:47,918 INFO : partition is sda1, dir is //images/install.img 09:01:47,918 INFO : mounting device sda1 for hard drive install 09:01:48,005 INFO : Path to stage2 image is /mnt/isodir///images/install.img 09:01:54,214 INFO : mounted loopback device /mnt/runtime on /dev/loop0 as /tmp/install.img 09:01:54,214 INFO : Looking for updates for HD in /mnt/isodir///images/updates.img 09:01:54,214 INFO : Looking for product for HD in /mnt/isodir///images/product.img 09:01:54,227 INFO : got stage2 at url hd:sda1:///images/install.img 09:01:54,254 INFO : Loading SELinux policy 09:01:54,700 INFO : getting ready to spawn shell now 09:01:54,975 INFO : Running anaconda script /usr/bin/anaconda 09:01:56,882 INFO : _Fedora is the highest priority installclass, using it 09:01:56,921 INFO : Running kickstart %%pre script(s) 09:01:56,922 WARNING : '/bin/sh' specified as full path 09:01:56,926 INFO : All kickstart %%pre script(s) have been run

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• Apache strace to hunt down a memory leak

  - by Zipp

  We have a server with a memory issue: the server keeps allocating itself memory and doesn't release it. We're running Apache. I set MaxReqsPerClient to a really low value just so the threads don't hold a lot of memory, but has anyone seen calls like this? Am I wrong in thinking that it's probably Drupal pulling too much data back from the cache in DB? read(52, "h_index\";a:2:{s:6:\"weight\";i:1;s"..., 6171) = 1368 read(52, "\";a:2:{s:6:\"author\";a:3:{s:5:\"la"..., 4803) = 1368 read(52, ":\"description\";s:19:\"Term name t"..., 3435) = 1368 read(52, "abel\";s:4:\"Name\";s:11:\"descripti"..., 2067) = 1368 read(52, "ions\";a:2:{s:4:\"form\";a:3:{s:4:\""..., 16384) = 708 brk(0x2ab554396000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55f653000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55f753000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55f853000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55f953000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55fa53000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55fb53000 brk(0x2ab554356000) = 0x2ab5542f5000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ab55fc53000 poll([{fd=52, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout) write(52, "d\0\0\0\3SELECT cid, data, created, "..., 104) = 104 read(52, "\1\0\0\1\5E\0\0\2\3def\23drupal_database_nam"..., 16384) = 1368 read(52, ";s:11:\"granularity\";a:5:{s:4:\"ye"..., 34783) = 1368 read(52, ":4:\"date\";}s:9:\"datestamp\";a:9:{"..., 33415) = 1368 read(52, "\";i:0;s:15:\"display_default\";i:0"..., 32047) = 1368 read(52, "e as an integer value.\";s:8:\"set"..., 30679) = 1368 read(52, "label' pairs, i.e. 'Fraction': 0"..., 29311) = 1368 top (the procs just keep growing in memory..): 12845 apache 15 0 581m 246m 37m S 0.0 4.1 0:17.39 httpd 12846 apache 15 0 571m 235m 37m S 0.0 4.0 0:12.13 httpd 12833 apache 15 0 420m 117m 37m S 0.0 2.0 0:06.04 httpd 12851 apache 15 0 412m 113m 37m S 0.0 1.9 0:05.32 httpd 13871 apache 15 0 409m 109m 37m S 0.0 1.8 0:04.90 httpd 12844 apache 15 0 407m 108m 37m S 0.0 1.8 0:04.50 httpd 13870 apache 15 0 407m 108m 37m S 0.3 1.8 0:03.50 httpd 14903 apache 15 0 402m 103m 37m S 0.3 1.7 0:01.29 httpd 14850 apache 15 0 397m 100m 37m S 0.0 1.7 0:02.08 httpd 14907 apache 15 0 390m 93m 36m S 0.0 1.6 0:01.32 httpd 13872 apache 15 0 386m 91m 37m S 0.0 1.5 0:03.13 httpd 12843 apache 15 0 373m 81m 37m S 0.0 1.4 0:02.51 httpd 14901 apache 15 0 370m 75m 33m S 0.0 1.3 0:00.78 httpd 14904 apache 15 0 335m 29m 15m S 0.0 0.5 0:00.26 httpd

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• Unusually high memory usage on a CentOS VPS with 512 guaranteed RAM

  - by Andrei Bârsan

  I'm working on a medium-sized web application written in PHP that's running on a VPS with 512mb ram. The webapp hasn't been officially launched yet, so there isn't too much traffic going on, just me and a few other people working on it. There is another slightly smaller webapp also hosted on this machine, among 4-5 other small static sites. We are running Centos 5 32-bit & cPanel/WHM. This is the result of running ps aux and, as you can see, it's not using 100% of the RAM. However, on the hypanel overview, it's always shown as using aroun 500MB ram, just for running apache, mysql, and the lowest-memory-footprint versions of the mail server, ftp server etc. -bash-3.2# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 2156 664 ? Ss 12:08 0:00 init [3] root 1123 0.0 0.0 2260 548 ? S<s 12:08 0:00 /sbin/udevd -d root 1462 0.0 0.0 1812 568 ? Ss 12:08 0:00 syslogd -m 0 named 1496 0.0 0.0 3808 820 ? Ss 12:08 0:00 nsd named 1497 0.0 0.0 10672 756 ? S 12:08 0:00 nsd named 1499 0.0 0.0 3880 584 ? S 12:08 0:00 nsd root 1514 0.0 0.1 7240 1064 ? Ss 12:08 0:00 /usr/sbin/sshd root 1522 0.0 0.0 2832 832 ? Ss 12:08 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid root 1534 0.0 0.1 3712 1328 ? S 12:08 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql - mysql 1667 0.0 2.9 225680 30884 ? Sl 12:08 0:00 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql - mailnull 1766 0.0 0.1 9352 1100 ? Ss 12:08 0:00 /usr/sbin/exim -bd -q60m root 1797 0.0 0.0 2156 708 ? Ss 12:08 0:00 /usr/sbin/dovecot root 1798 0.0 0.0 2632 1012 ? S 12:08 0:00 dovecot-auth root 1816 0.0 3.0 38580 32456 ? Ss 12:08 0:01 /usr/local/bin/spamd -d --allowed-ips=127.0.0.1 --pidfi root 1839 0.0 1.6 63200 17496 ? Ss 12:08 0:00 /usr/local/apache/bin/httpd -k start -DSSL root 1846 0.0 0.1 5416 1468 ? Ss 12:08 0:00 pure-ftpd (SERVER) root 1848 0.0 0.1 6212 1244 ? S 12:08 0:00 /usr/sbin/pure-authd -s /var/run/ftpd.sock -r /usr/sbin root 1856 0.0 0.1 4492 1112 ? Ss 12:08 0:00 crond root 1864 0.0 0.0 2356 428 ? Ss 12:08 0:00 /usr/sbin/atd dovecot 1927 0.0 0.1 5196 1952 ? S 12:08 0:00 pop3-login dovecot 1928 0.0 0.1 5196 1948 ? S 12:08 0:00 pop3-login dovecot 1929 0.0 0.1 5316 2012 ? S 12:08 0:00 imap-login dovecot 1930 0.0 0.2 5416 2228 ? S 12:08 0:00 imap-login root 1939 0.0 0.1 3936 1964 ? S 12:08 0:00 cPhulkd - processor root 1963 0.0 0.8 15876 8564 ? S 12:08 0:00 cpsrvd (SSL) - waiting for connections root 1966 0.0 0.7 15172 7748 ? S 12:08 0:00 cpdavd - accepting connections on 2077 and 2078 root 1990 0.0 0.2 5008 3136 ? S 12:08 0:00 queueprocd - wait to process a task root 2017 0.0 2.9 38580 31020 ? S 12:08 0:00 spamd child root 2018 0.0 0.5 8904 5636 ? S 12:08 0:00 /usr/bin/perl /usr/local/cpanel/bin/leechprotect nobody 2021 0.0 3.2 66512 33724 ? S 12:08 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 2022 0.0 3.1 67812 33024 ? S 12:08 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 2024 0.0 1.9 64364 20680 ? S 12:08 0:00 /usr/local/apache/bin/httpd -k start -DSSL root 2027 0.0 0.4 9000 4540 ? S 12:08 0:00 tailwatchd root 2032 0.0 0.1 4176 1836 ? SN 12:08 0:00 cpanellogd - sleeping for logs nobody 3096 0.0 1.9 64572 20264 ? S 12:09 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 3097 0.0 2.8 66008 30136 ? S 12:09 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 3098 0.0 2.8 65704 29752 ? S 12:09 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 3099 0.0 3.1 67260 32816 ? S 12:09 0:00 /usr/local/apache/bin/httpd -k start -DSSL andrei 3448 0.0 0.1 3204 1632 ? S 12:50 0:00 imap nobody 3537 0.0 1.9 64308 20108 ? S 13:01 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 3614 0.0 1.9 64576 20628 ? S 13:10 0:00 /usr/local/apache/bin/httpd -k start -DSSL nobody 3615 0.0 1.3 63200 14672 ? S 13:10 0:00 /usr/local/apache/bin/httpd -k start -DSSL root 3626 0.0 0.2 10232 2964 ? Rs 13:14 0:00 sshd: root@pts/0 root 3648 0.0 0.1 3844 1600 pts/0 Ss 13:14 0:00 -bash root 3826 0.0 0.0 2532 908 pts/0 R+ 13:21 0:00 ps aux Lately, without any significant changes to the configuration, the memory usage started peaking and going over 512, causing the virtual server to kill apache, basically murdering our site in the process. Do you have any idea if this is normal and more resources should be acquired? I don't think... since there isn't too much data or traffic online yet.

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• Bad network performance on KVM guest

  - by Devator

  I have a dedicated server connected to a 1000 Mbit port. However, the Debian guest is only getting half to a 1/4 the speeds: On the node itself (Linux node 2.6.32-279.9.1.el6.x86_64 #1 SMP Tue Sep 25 21:43:11 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux): wget http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin -O /dev/null --2012-11-11 23:10:11-- http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin Resolving www.bbned.nl... 62.177.144.181 Connecting to www.bbned.nl|62.177.144.181|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 1048576000 (1000M) [application/octet-stream] Saving to: â/dev/nullâ 100%[====================================>] 1,048,576,000 100M/s in 10s 2012-11-11 23:10:21 (100 MB/s) - â/dev/nullâ On the guest (Debian 6.0.5, x64: Linux debian 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux): wget http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin -O /dev/null --2012-11-11 23:10:41-- http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin Resolving www.bbned.nl... 62.177.144.181 Connecting to www.bbned.nl|62.177.144.181|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 1048576000 (1000M) [application/octet-stream] Saving to: â/dev/nullâ 100%[=================================================================================================================================================================================================>] 1,048,576,000 16.5M/s in 42s 2012-11-11 23:11:23 (23.8 MB/s) - â/dev/nullâ I use the virtio NIC. I tried some more NICs: e1000 and the Realtek 8139 but those yield even worse results. Anyone has an idea how to improve these speeds?

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• Server load high, CPU idle. NFS the cause?

  - by Mech Software

  I am running into a scenario where I'm seeing a high server load (sometimes upwards of 20 or 30) and a very low CPU usage (98% idle). I'm wondering if these wait states are coming as part of an NFS filesystem connection. Here is what I see in VMStat procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 2 1 0 1298784 0 0 0 0 16 5 0 9 1 1 97 2 0 0 1 0 1308016 0 0 0 0 0 0 0 3882 4 3 80 13 0 0 1 0 1307960 0 0 0 0 120 0 0 2960 0 0 88 12 0 0 1 0 1295868 0 0 0 0 4 0 0 4235 1 2 84 13 0 6 0 0 1292740 0 0 0 0 0 0 0 5003 1 1 98 0 0 4 0 0 1300860 0 0 0 0 0 120 0 11194 4 3 93 0 0 4 1 0 1304576 0 0 0 0 240 0 0 11259 4 3 88 6 0 3 1 0 1298952 0 0 0 0 0 0 0 9268 7 5 70 19 0 3 1 0 1303740 0 0 0 0 88 8 0 8088 4 3 81 13 0 5 0 0 1304052 0 0 0 0 0 0 0 6348 4 4 93 0 0 0 0 0 1307952 0 0 0 0 0 0 0 7366 5 4 91 0 0 0 0 0 1307744 0 0 0 0 0 0 0 3201 0 0 100 0 0 4 0 0 1294644 0 0 0 0 0 0 0 5514 1 2 97 0 0 3 0 0 1301272 0 0 0 0 0 0 0 11508 4 3 93 0 0 3 0 0 1307788 0 0 0 0 0 0 0 11822 5 3 92 0 0 From what I can tell when the IO goes up the waits go up. Could NFS be the cause here or should I be worried about something else? This is a VPS box on a fiber channel SAN. I'd think the bottleneck wouldn't be the SAN. Comments?

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• JBD: Spotted dirty metadata buffer

  - by Jake Mach

  Sep 25 22:19:38 host kernel: [7798806.146942] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 267). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.146956] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 1). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.146967] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 353). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147121] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 353). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147133] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 1). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147143] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 267). There's a risk of filesystem corruption in case of system crash. [7817859.850517] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 1: 28618 blocks in bitmap, 29028 in gd what does this mean? how did this happen?

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• How to correctly partion WD "Advanced Format" drive (4k sector size) with Disk Druid?

  - by FractalizeR

  Hello. Unaligned Advanced Format drives with sector size of 4k will have degraded performance. How do I make Disk Druid to partition drives correctly?

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• Yum lock file problem

  - by David Reynolds

  When there are more than 1 copies of yum running, I get this error: Another app is currently holding the yum lock; waiting for it to exit Is there a way to make yum just exit the first time it can't get the lock rather than stay open waiting for it?

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