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• Log - Server kernel: INFO: task httpd:000000 blocked for more than 120 seconds

  - by valter

  Almost everyday my server is crashing due to hight server load, and even restarting apache or mysql can't solve the problem. I need to reboot the server to solve, or it crash again due to the high load. The log system records something like this when it crashes: Aug 11 18:33:53 server kernel: INFO: task httpd:20008 blocked for more than 120 seconds. Aug 11 18:33:53 server kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 11 18:33:53 server kernel: httpd D ffffffff801538ac 0 20008 5816 20066 19809 (NOTLB) Aug 11 18:33:53 server kernel: ffff81025a299dc8 0000000000000082 ffff81033b4c0740 ffffffff80009a14 Aug 11 18:33:53 server kernel: ffff8101063f8d80 0000000000000009 ffff8100b758f7e0 ffff8101c57187e0 Aug 11 18:33:53 server kernel: 00009436d4100b6c 000000000001d50f ffff8100b758f9c8 000000083b531588 Aug 11 18:33:53 server kernel: Call Trace: Aug 11 18:33:53 server kernel: [<ffffffff80009a14>] __link_path_walk+0x173/0xfb9 Aug 11 18:33:53 server kernel: [<ffffffff8002cc16>] mntput_no_expire+0x19/0x89 Aug 11 18:33:53 server kernel: [<ffffffff80063c4f>] __mutex_lock_slowpath+0x60/0x9b Aug 11 18:33:53 server kernel: [<ffffffff80023908>] __path_lookup_intent_open+0x56/0x97 Aug 11 18:33:53 server kernel: [<ffffffff80063c99>] .text.lock.mutex+0xf/0x14 Aug 11 18:33:53 server kernel: [<ffffffff8001b21f>] open_namei+0xea/0x712 Aug 11 18:33:54 server kernel: [<ffffffff8002768a>] do_filp_open+0x1c/0x38 Aug 11 18:33:54 server kernel: Firewall: *UDP_IN Blocked* IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:30:48:9e:6e:99:08:00 SRC=208.43.135.158 DST=255.255.255.255 LEN=151 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=38354 DPT=6112 LEN=131 Aug 11 18:33:54 server kernel: [<ffffffff8001a061>] do_sys_open+0x44/0xbe Aug 11 18:33:54 server kernel: [<ffffffff8005d28d>] tracesys+0xd5/0xe0 I googled a lot trying to find a solution. But it looks that the solution is just to update the kernel or disk driver, thinks that I don't know how to do. In this url http://bugs.centos.org/view.php?id=4515 a lot o people report similar problems, except the fact that they are not related to httpd like mine. According to one member, one solution would be to add "elevator=noop " to /etc/grub.conf like in this example: title CentOS (2.6.18-238.12.1.el5xen) root (hd0,0) kernel /vmlinuz-2.6.18-238.12.1.el5xen ro root=/dev/VolGroup00/LogVol00 elevator=noop initrd /initrd-2.6.18-238.12.1.el5xen.img Would this really solve the problem? My disk are working in RAID. Can this cause some problem to my server? Is there any other solution?

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• Display \n characters as newlines when using tail?

  - by GSto

  I have a file that I am trying to read by using tail -f. I was wondering if there was a way to have the terminal output an actual line break instead of the \n character.

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• Passive Scan using wpa_supplicant-0.7.3

  - by Ashish Yadav

  I am using wpa_supplicant-0.7.3 and WL12xx TI Driver(WiFi) . Looking into both code,I seen that both support passive scan . Also, nl80211 driver is used (not wext). I am not able to find any command for passive scan in wpa_cli . With iw , for passive scan we can use : iw dev wlan0 scan passive Similar I want to do passive scan using wpa_supplicant . So need help to know how to do passive scan using wpa_supplicant?

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• Creating a USB stick for installing centos 6.x using DVD1 and DVD2 iso files

  - by user250563

  First, we create 2 partitions on the USB stick that is let's say 16GB. first partition is let's say only 1GB and the second partition is the rest of what is available. after we "w" write the changes, the USB now has 2 partitions. 1 is 1GB 1 is more than 14GB so , we have... sdb1 and sdb2 now. now we need to turn these partitions into filesystems some say i should run these commands after those procedures. mkfs.vfat -F 32 /dev/sdb1 mkfs.ext3 /dev/sdb2 but some web pages recommend using: mkfs.vfat -n BOOT /dev/sdb1 mkfs.ext2 -m 0 -b 4096 -L DATA /dev/sdb2 which is it? so let's say the DVDs are called: CentOS-6.4-x86_64-bin-DVD1.iso CentOS-6.4-x86_64-bin-DVD2.iso so we make a directory: mkdir -p /mnt/dvd1 and then mount it: mount -o loop CentOS-6.4-x86_64-bin-DVD1.iso /mnt/dvd1 and i suppose we don't make a directory for dvd2 and we don't have to mount it ? at this point i do not know what should be done. but i think this step might be next: we make the USB bootable by finding the file named mbr.bin and then moving it to there via these commnad. dd conv=notrunc bs=440 count=1 if=/usr/lib/syslinux/mbr.bin of=/dev/sdb parted /dev/sdb set 1 boot on in other words we are "dd-ing it to 'sdb' not sdb1' or 'sdb2'. and then we use parted to set the boot to on for sdb so far everything looks good? here is the confusing parts.. how exactly do i move these iso files to the usb drive? EVERYTHING BELOW IS A GUESS. so at this point i should copy the folder /mnt/dvd1/isolinux to usb's sdb1 or sdb2 ? rename it to syslinux ? and then inside this syslinux folder there will be a file called... isolinux.cfg ? which should be renamed to syslinux.cfg ? and then copy the contents of /mnt/dvd1/images/* to USB's sdb2 ? but i think i am also suppose to copy and paste the both CentOS-6.4-x86_64-bin-DVD1.iso CentOS-6.4-x86_64-bin-DVD2.iso somewhere into this USB's sdb2 partition, correct ? almost like a drag and drop kind of a thing? or do they go into any folders ? centos' own web site has some instructions but those instructions do not work. http://wiki.centos.org/HowTos/InstallFromUSBkey i once got this working but things got ruined, i have to do it again and this time take notes.

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• How to fix bluescreen in windows 7 with multi-boot?

  - by Ismail Sensei

  I have HP laptop 6730S with two Operating systems : Windows 7 Ultimate 32bit Centos 6.4 64Bit The GRUB2 is not installed in MBR, use Windows' bootloader. After I choose Windows in the start, the blue-screen appears with unmountable_boot_volume problem so I tried some help from similar questions here ( use Command Prompt and enter the following command: chkdsk /R C: ). But the problem is, I can't get repair my computer it took so long and nothing happened after I waited more than 2H and when I put my Windows 7 DVD to boot it charge the files then same thing happened nothing show up so I couldn't use command prompt. But when I use Centos everything works just fine the D partition i can mounted normally but C partition it shows me error and tell me to go to windows and repair it with Chkdsk command and here is where I am stuck.

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• Is it possible to format ps RSS (memory) output to be more human friendly?

  - by metasoarous

  Executing ps ux returns a nice list of process information, easy to grep through or watch. However, there doesn't seem to be much flexibility in the memory usage output; the RSS (resident set size) is printed in kB, which for large processes is hard to read (especially at a glance), and %MEM gives 100 × RSS / system_memory. The du utility has a lovely -h flag which prints space in a more user friendly fashion. I have not been able to find anything equivalent for ps. Is there a special formatting trick that can accomplish this?

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• Postfix + procmail - delivery fails because "can't create user output file" - on CentOS 6.2

  - by jshin47

  I verified that my postfix installation / relaying setup worked. Now I am having trouble with procmail. I have it wired to postfix with the following command: mailbox_command = /usr/bin/procmail -f -a "$USER" I have nothing in my procmail config but the following: LOGFILE=/var/procmailrc/log And I send an email to a recipient that previously worked (before I attached procmail). Now it fails with error: Apr 6 14:07:05 localhost postfix/qmgr[15194]: D0C3DFF6E1: from=<[email protected]>, size=938, nrcpt=1 (queue active) Apr 6 14:07:05 localhost postfix/local[1953]: D0C3DFF6E1: to=<[email protected]>, orig_to=<postmaster>, relay=local, delay=0.05, delays=0.02/0.01/0/0.02, dsn=5.2.0, status=bounced (can't create user output file. Command output: procmail: Couldn't create "/var/spool/mail/nobody" procmail: Couldn't read "//root" ) Apr 6 14:07:05 localhost postfix/bounce[1955]: warning: D0C3DFF6E1: undeliverable postmaster notification discarded Apr 6 14:07:05 localhost postfix/qmgr[15194]: D0C3DFF6E1: removed It seems like there is some sort of permissions issue but I do not know what the problem is, nor do I understand how I would go about diagnosing it further. The logfile that I specified is empty, by the way. How can I make procmail+postfix work?

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• Tomcat: how to change location of manager and host-manager to a subdirectory

  - by rolandpish

  Hi there. I'm running a Tomcat 6.0.28 at port 8080 in a Debian Squeeze box. I'm a newbie in tomcat. I would like to change the location of manager and host-manager applications. That is, instead of going to: http://myserver:8080/manager/html I would like that to be: http://myserver:8080/somesubdirectory/manager/html Is this possible? If yes, how can I achieve this? I would really appreciate any help in this. I've been trying to change the context of /etc/tomcat6/Catalina/localhost/manager.xml from /manager to /somesubdirectory/manager with no success. Also I tried to create a symlink under /var/lib/tomcat6/webapps/ROOT/somesubdirectory/manager with no success. Thanks in advance. Cheers.

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• Is there a max thread per mongrel?

  - by Blankman

  I don't know much about ruby, much less how or what is involved with hosting a ruby on rails web app. BUT, I recall hearing someone saying that they have to run multiple mongrels b/c of a limit of 50 threads? Is this true (or something similiar)? Why does it have this limitation?

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• Not sure about ACL permissions

  - by Darko Miletic

  I'm writing up something about ACL usage on CentOS but since I still do not have a box ready I would like to ask something. Let us assume we have a folder /var/www/test If I do this in terms of permissions: /bin/chown -R root:root /var/www/test/ /bin/chmod -R u=rwx,go= /var/www/test/ /usr/bin/setfacl -R -m u:apache:rwx /var/www/test/ Will user apache be able to change owner of folder test or of any particular file within that folder? If answer is yes shall I than use group instead of user?

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• Easy way of daemonizing in CentOS 5.4

  - by Saif Bechan

  I know there is a program called upstart that can make it easy to make small daemons. I can't get this program to configure on CentOS. I get all sort of errors concerning pkg-congfig, libnih, and dbus. I am working on a node.ja application and this is a pain to start and stop all the time, so I want to create a deamon for this which makes it easy to start and stop.

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• Monitor ssh on non-default port with Nagios

  - by obvio171

  I just deployed Nagios on a Gentoo server and everything is fine except ssh, which it marks as "CRITICAL" because it's refusing connections. But that's because it's running on a port different from the default 22. How do I change it so that it monitors the right port?

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• GNU screen - Unable to reattach to screen after lost connection

  - by subhashish

  I was using irssi in screen but lost connection. After I ssh'd back in to the server, I can no longer attach to that screen. screen -ls shows that the screen is already attached. I tried screen -D to force detach it, and it said detach but screen -ls still says it's attached. I tried screen -x and it just hangs there. [sub@server ~]$ screen -ls There are screens on: 4033.poe (Detached) 7728.irssi (Attached) 2 Sockets in /var/run/screen/S-sub. What can I do now?

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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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• server will not reply (syn -ack)

  - by Brent

  I like to use the following commands to manage 'TIME_WAIT', in the hope to free up resources. echo 20 > /proc/sys/net/ipv4/tcp_fin_timeout sysctl -w net.ipv4.tcp_tw_reuse=1 sysctl -w net.ipv4.tcp_tw_recycle=1 I found something interesting while doing a tcpdump. Sometimes if a client makes a connection (syn), the server will not reply (syn -ack). My question is, could it be because of the top three commands.

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• How do I send mail from Tripwire using SMTP?

  - by ThomasG33K

  I have just installed tripwire using Ubuntu repos and have gone into the configuration files and changed everything to what I want. When in comes to the options for SMTP mail method and the server and port to use, I am stumped. When I run the test email I get this error message. /usr/sbin/tripwire --test --email blah@nowhere Sending a test message to: blah@nowhere ### Error: The SMTP connection could not be established. ### Server: localhost ### Exiting... Email test failed. I have made appropriate changes to the firewall. I don't have an smtp server installed. Do I need to? Any other ways I could use without installing an SMTP server due to security issues?

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• kill + ignore to kill proccess if not alive

  - by yael

  how to tell kill command to ignore to kill proccess if the proccess not alive? for example 3453 is alive proccess but 44534 not kill -9 3453 44534

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• Dedicated server automatic backup solution

  - by Luigi

  I have a dedicated Ubuntu web server in a cloud environment, and I am looking for a nice way to do automated backups. I would like to backup some directories with web apps, and all my MySql databases. As for destination: make snapshots every two hours localy, and every six hours to a remote ftp server. Also delete backup archives older than seven days(localy + ftp), and notify on any problems by email. Now to achieve some of this functionality I use cron + shell script, and http://www.mysqldumper.net/, but really that doesn't answer my needs. Mysqldumper doesn't know automaticly about new databases, and shell script does not notify on problems. It's something I have to check out from time to time, and i don't have trust for. I googled a while, and seems like most people solve this stuff with shell scripts. Is this a method you can trust? Are there any web-gui tools, I'm missing? Maybe there is a smarter startegy for doing this? I'm a little bit confused.

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• ntpd on Fedora Core 6 with high negative time reset values

  - by Mark White

  The basic problem is we have a FC6 server instance running on a virtual machine, and the system time seems to have been slowly varying until it is now causing a problem. The server runs 24/7 and has been up for 155 days. It has been changed to show GMT, and reports the time as (example) 00:15:15 GMT whereas the actual time is 00:00:00 GMT. This is an offset of 915 seconds. selinux has been changed to 'setenforce 0' for testing and I am running as root. I stop the ntpd service and change the time in System|Administration|Date & Time. The time still shows the same with 'date' in bash. There are no error logs. I change the date with 'date --set' in bash. The response confirms the changed date. I run 'date' and the incorrect date is shown. There are no error logs. I start the ntpd service and /var/log/messages shows success with 'time reset -915.720139s'. The date remains unchanged. ntpq -p shows three three time servers all have offsets of around -915 seconds. I stop ntpd service and try 'ntpd -gqx' and get the same result as above - success, but a large negative time reset. I've tried varying combinations of the above, and a few more settings in System|Administration|Date & Time - no change. I just need to reset the system time to GMT. No offset. But I can't wait for ntpd to slew the time over the next few weeks. Any advice is welcome, cheers! Surely this shouldn't be this difficult... Mark...

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• Do you know of any download accelerator that can resume partial downloads from wget?

  - by Sergio

  I have used wget to try to download a big file. After several hours I realized that it would have been better to use a download accelerator. I would not like to discard the significant portion that wget has already downloaded. Do you know of any download accelerator that can resume this partial download?

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• Should I install software on a "SAN"

  - by am2605

  Hi, I need to set up ColdFusion 9 on a ubuntu server that has a SAN disk mounted. Is it appropriate to install the CF server software on this disk? I don't really understand the ins and outs of what a SAN is, so I am not sure if the intention is for me to solely install web content on it or whether the server software itself should go here too. Any advice would be extremeness welcome. Many thanks, Andrew.

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• how to limit disk space per user in a PHP web application & CentOS

  - by solid

  we have a web application written in PHP and we want all our users to be able to upload images for e.g. 50MB. We will create a directory structure so that every user has its own folder like app/user1/images app/user2/images ... Now everytime a user uploads an image, we need to check if this is still allowed or not but we don't want 1000 users to continously scan our hard drive counting file sizes in their directory. So writing a script that counts all file sizes in a user directory is not an option I guess? Is there an easier way to calculate used up space per user and limit our app accordingly?

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• Missing NFS service link?

  - by Recc

  # ps ax | grep nfs 1108 ?        S<     0:00 [nfsd4] 1109 ?        S<     0:00 [nfsd4_callbacks] 1110 ?        S      0:00 [nfsd] 1111 ?        S      0:00 [nfsd] 1112 ?        S      0:00 [nfsd] 1113 ?        S      0:00 [nfsd] 1114 ?        S      0:00 [nfsd] 1115 ?        S      0:00 [nfsd] 1116 ?        S      0:00 [nfsd] 1117 ?        S      0:00 [nfsd] 4437 ?        S<     0:00 [nfsiod] 16799 ?        S      0:00 [nfsv4.0-svc] 18091 pts/1    S+     0:00 grep nfs But # service nfs status nfs: unrecognized service That'll be on Ubuntu 11.04 am I missing a sym link or something? How can I fix this quickly?

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• Failed to su after making a chroot jail

  - by arepo21

  On a 64 bit CentOS host I am using script make_chroot_jail.sh to put a user in a jail, not permitting it to see anything expect it's home at /home/jail/home/user1. I did it typing this: sudo ./make_chroot_jail.sh user1 after, when trying to connect to user1 first i was getting an error like: /bin/su: user guest does not exist i have fixed this by copying some missed libraries: sudo cp /lib64/libnss_compat.so.2 /lib64/libnss_files.so.2 /lib64/libnss_dns.so.2 /lib64/libxcrypt.so.2 /home/jail/lib64/ sudo cp -r /lib64/security/ /home/jail/lib64/ But now, when trying to connect to user1 typing su user1 and then typing it's password, i am getting this error: could not open session So the question is how to connect to user1 in this situation? P.S. Here are the permissions of some files, this might be helpful in order to provide a solution: -rwsr-xr-x 1 root root /home/jail/bin/su drwxr-xr-x 4 root root /home/jail/etc -rw-r--r-- 1 root root /home/jail/etc/pam.d/su -rw-r--r-- 1 root root /home/jail/etc/passwd -rw------- 1 root root /home/jail/etc/shadow UPDATE1 After some modifications i managed to connect to user1, but the session closes immediately! I guess this a PAM issue, however cant find a way to fix it. Here the log entry for close action from /val/log/secure: Oct 6 15:19:42 localhost su: pam_unix(su:session): session closed for user user1 What makes the session to exit immediately after launching?

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• What amount of physical RAM would a typical "commodity class" server have, as of late 2013?

  - by marathon

  I'm trying to spec out servers for my company's infrastructure group to build. They tell me anything more than 2GB is too much, which I find ridiculous considering cheap DRAM is about 15 bucks a dimm in bulk and our particular software runs better with more memory. I tried to find out how much google servers use, and pinning down a number is hard. Best I could find in a google research paper was that in 2008, their commodity servers were using 2 and 4GB dimms, but the paper never said how many. I realize "commodity server" is a vague term, but I'm just looking for a rough range in RAM used. I suspect at least 16GB is going to be the norm.

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